OpenGLRenderer.cpp revision 7c25aab491707f7324f9941b8cfa9bd2b4b97e76 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "OpenGLRenderer"
18
19#include <stdlib.h>
20#include <stdint.h>
21#include <sys/types.h>
22
23#include <SkCanvas.h>
24#include <SkPathMeasure.h>
25#include <SkTypeface.h>
26
27#include <utils/Log.h>
28#include <utils/StopWatch.h>
29
30#include <private/hwui/DrawGlInfo.h>
31
32#include <ui/Rect.h>
33
34#include "OpenGLRenderer.h"
35#include "DisplayListRenderer.h"
36#include "PathRenderer.h"
37#include "Properties.h"
38#include "Vector.h"
39
40namespace android {
41namespace uirenderer {
42
43///////////////////////////////////////////////////////////////////////////////
44// Defines
45///////////////////////////////////////////////////////////////////////////////
46
47#define RAD_TO_DEG (180.0f / 3.14159265f)
48#define MIN_ANGLE 0.001f
49
50#define ALPHA_THRESHOLD 0
51
52#define FILTER(paint) (!paint || paint->isFilterBitmap() ? GL_LINEAR : GL_NEAREST)
53
54///////////////////////////////////////////////////////////////////////////////
55// Globals
56///////////////////////////////////////////////////////////////////////////////
57
58/**
59 * Structure mapping Skia xfermodes to OpenGL blending factors.
60 */
61struct Blender {
62    SkXfermode::Mode mode;
63    GLenum src;
64    GLenum dst;
65}; // struct Blender
66
67// In this array, the index of each Blender equals the value of the first
68// entry. For instance, gBlends[1] == gBlends[SkXfermode::kSrc_Mode]
69static const Blender gBlends[] = {
70    { SkXfermode::kClear_Mode,    GL_ZERO,                GL_ONE_MINUS_SRC_ALPHA },
71    { SkXfermode::kSrc_Mode,      GL_ONE,                 GL_ZERO },
72    { SkXfermode::kDst_Mode,      GL_ZERO,                GL_ONE },
73    { SkXfermode::kSrcOver_Mode,  GL_ONE,                 GL_ONE_MINUS_SRC_ALPHA },
74    { SkXfermode::kDstOver_Mode,  GL_ONE_MINUS_DST_ALPHA, GL_ONE },
75    { SkXfermode::kSrcIn_Mode,    GL_DST_ALPHA,           GL_ZERO },
76    { SkXfermode::kDstIn_Mode,    GL_ZERO,                GL_SRC_ALPHA },
77    { SkXfermode::kSrcOut_Mode,   GL_ONE_MINUS_DST_ALPHA, GL_ZERO },
78    { SkXfermode::kDstOut_Mode,   GL_ZERO,                GL_ONE_MINUS_SRC_ALPHA },
79    { SkXfermode::kSrcATop_Mode,  GL_DST_ALPHA,           GL_ONE_MINUS_SRC_ALPHA },
80    { SkXfermode::kDstATop_Mode,  GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA },
81    { SkXfermode::kXor_Mode,      GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA },
82    { SkXfermode::kPlus_Mode,     GL_ONE,                 GL_ONE },
83    { SkXfermode::kMultiply_Mode, GL_ZERO,                GL_SRC_COLOR },
84    { SkXfermode::kScreen_Mode,   GL_ONE,                 GL_ONE_MINUS_SRC_COLOR }
85};
86
87// This array contains the swapped version of each SkXfermode. For instance
88// this array's SrcOver blending mode is actually DstOver. You can refer to
89// createLayer() for more information on the purpose of this array.
90static const Blender gBlendsSwap[] = {
91    { SkXfermode::kClear_Mode,    GL_ONE_MINUS_DST_ALPHA, GL_ZERO },
92    { SkXfermode::kSrc_Mode,      GL_ZERO,                GL_ONE },
93    { SkXfermode::kDst_Mode,      GL_ONE,                 GL_ZERO },
94    { SkXfermode::kSrcOver_Mode,  GL_ONE_MINUS_DST_ALPHA, GL_ONE },
95    { SkXfermode::kDstOver_Mode,  GL_ONE,                 GL_ONE_MINUS_SRC_ALPHA },
96    { SkXfermode::kSrcIn_Mode,    GL_ZERO,                GL_SRC_ALPHA },
97    { SkXfermode::kDstIn_Mode,    GL_DST_ALPHA,           GL_ZERO },
98    { SkXfermode::kSrcOut_Mode,   GL_ZERO,                GL_ONE_MINUS_SRC_ALPHA },
99    { SkXfermode::kDstOut_Mode,   GL_ONE_MINUS_DST_ALPHA, GL_ZERO },
100    { SkXfermode::kSrcATop_Mode,  GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA },
101    { SkXfermode::kDstATop_Mode,  GL_DST_ALPHA,           GL_ONE_MINUS_SRC_ALPHA },
102    { SkXfermode::kXor_Mode,      GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA },
103    { SkXfermode::kPlus_Mode,     GL_ONE,                 GL_ONE },
104    { SkXfermode::kMultiply_Mode, GL_DST_COLOR,           GL_ZERO },
105    { SkXfermode::kScreen_Mode,   GL_ONE_MINUS_DST_COLOR, GL_ONE }
106};
107
108///////////////////////////////////////////////////////////////////////////////
109// Constructors/destructor
110///////////////////////////////////////////////////////////////////////////////
111
112OpenGLRenderer::OpenGLRenderer(): mCaches(Caches::getInstance()) {
113    mShader = NULL;
114    mColorFilter = NULL;
115    mHasShadow = false;
116    mHasDrawFilter = false;
117
118    memcpy(mMeshVertices, gMeshVertices, sizeof(gMeshVertices));
119
120    mFirstSnapshot = new Snapshot;
121
122    mScissorOptimizationDisabled = false;
123}
124
125OpenGLRenderer::~OpenGLRenderer() {
126    // The context has already been destroyed at this point, do not call
127    // GL APIs. All GL state should be kept in Caches.h
128}
129
130void OpenGLRenderer::initProperties() {
131    char property[PROPERTY_VALUE_MAX];
132    if (property_get(PROPERTY_DISABLE_SCISSOR_OPTIMIZATION, property, "false")) {
133        mScissorOptimizationDisabled = !strcasecmp(property, "true");
134        INIT_LOGD("  Scissor optimization %s",
135                mScissorOptimizationDisabled ? "disabled" : "enabled");
136    } else {
137        INIT_LOGD("  Scissor optimization enabled");
138    }
139}
140
141///////////////////////////////////////////////////////////////////////////////
142// Setup
143///////////////////////////////////////////////////////////////////////////////
144
145bool OpenGLRenderer::isDeferred() {
146    return false;
147}
148
149void OpenGLRenderer::setViewport(int width, int height) {
150    initViewport(width, height);
151
152    glDisable(GL_DITHER);
153    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
154
155    glEnableVertexAttribArray(Program::kBindingPosition);
156}
157
158void OpenGLRenderer::initViewport(int width, int height) {
159    mOrthoMatrix.loadOrtho(0, width, height, 0, -1, 1);
160
161    mWidth = width;
162    mHeight = height;
163
164    mFirstSnapshot->height = height;
165    mFirstSnapshot->viewport.set(0, 0, width, height);
166}
167
168status_t OpenGLRenderer::prepare(bool opaque) {
169    return prepareDirty(0.0f, 0.0f, mWidth, mHeight, opaque);
170}
171
172status_t OpenGLRenderer::prepareDirty(float left, float top, float right, float bottom,
173        bool opaque) {
174    mCaches.clearGarbage();
175
176    mSnapshot = new Snapshot(mFirstSnapshot,
177            SkCanvas::kMatrix_SaveFlag | SkCanvas::kClip_SaveFlag);
178    mSnapshot->fbo = getTargetFbo();
179    mSaveCount = 1;
180
181    mSnapshot->setClip(left, top, right, bottom);
182    mDirtyClip = opaque;
183
184    updateLayers();
185
186    // If we know that we are going to redraw the entire framebuffer,
187    // perform a discard to let the driver know we don't need to preserve
188    // the back buffer for this frame.
189    if (mCaches.extensions.hasDiscardFramebuffer() &&
190            left <= 0.0f && top <= 0.0f && right >= mWidth && bottom >= mHeight) {
191        const GLenum attachments[] = { getTargetFbo() == 0 ? GL_COLOR_EXT : GL_COLOR_ATTACHMENT0 };
192        glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, attachments);
193    }
194
195    syncState();
196
197    // Functors break the tiling extension in pretty spectacular ways
198    // This ensures we don't use tiling when a functor is going to be
199    // invoked during the frame
200    mSuppressTiling = mCaches.hasRegisteredFunctors();
201
202    mTilingSnapshot = mSnapshot;
203    startTiling(mTilingSnapshot, true);
204
205    debugOverdraw(true, true);
206
207    return clear(left, top, right, bottom, opaque);
208}
209
210status_t OpenGLRenderer::clear(float left, float top, float right, float bottom, bool opaque) {
211    if (!opaque) {
212        mCaches.enableScissor();
213        mCaches.setScissor(left, mSnapshot->height - bottom, right - left, bottom - top);
214        glClear(GL_COLOR_BUFFER_BIT);
215        return DrawGlInfo::kStatusDrew;
216    }
217
218    mCaches.resetScissor();
219    return DrawGlInfo::kStatusDone;
220}
221
222void OpenGLRenderer::syncState() {
223    glViewport(0, 0, mWidth, mHeight);
224
225    if (mCaches.blend) {
226        glEnable(GL_BLEND);
227    } else {
228        glDisable(GL_BLEND);
229    }
230}
231
232void OpenGLRenderer::startTiling(const sp<Snapshot>& s, bool opaque) {
233    if (!mSuppressTiling) {
234        Rect* clip = mTilingSnapshot->clipRect;
235        if (s->flags & Snapshot::kFlagIsFboLayer) {
236            clip = s->clipRect;
237        }
238
239        mCaches.startTiling(clip->left, s->height - clip->bottom,
240                clip->right - clip->left, clip->bottom - clip->top, opaque);
241    }
242}
243
244void OpenGLRenderer::endTiling() {
245    if (!mSuppressTiling) mCaches.endTiling();
246}
247
248void OpenGLRenderer::finish() {
249    renderOverdraw();
250    endTiling();
251
252    if (!suppressErrorChecks()) {
253#if DEBUG_OPENGL
254        GLenum status = GL_NO_ERROR;
255        while ((status = glGetError()) != GL_NO_ERROR) {
256            ALOGD("GL error from OpenGLRenderer: 0x%x", status);
257            switch (status) {
258                case GL_INVALID_ENUM:
259                    ALOGE("  GL_INVALID_ENUM");
260                    break;
261                case GL_INVALID_VALUE:
262                    ALOGE("  GL_INVALID_VALUE");
263                    break;
264                case GL_INVALID_OPERATION:
265                    ALOGE("  GL_INVALID_OPERATION");
266                    break;
267                case GL_OUT_OF_MEMORY:
268                    ALOGE("  Out of memory!");
269                    break;
270            }
271        }
272#endif
273
274#if DEBUG_MEMORY_USAGE
275        mCaches.dumpMemoryUsage();
276#else
277        if (mCaches.getDebugLevel() & kDebugMemory) {
278            mCaches.dumpMemoryUsage();
279        }
280#endif
281    }
282}
283
284void OpenGLRenderer::interrupt() {
285    if (mCaches.currentProgram) {
286        if (mCaches.currentProgram->isInUse()) {
287            mCaches.currentProgram->remove();
288            mCaches.currentProgram = NULL;
289        }
290    }
291    mCaches.unbindMeshBuffer();
292    mCaches.unbindIndicesBuffer();
293    mCaches.resetVertexPointers();
294    mCaches.disbaleTexCoordsVertexArray();
295    debugOverdraw(false, false);
296}
297
298void OpenGLRenderer::resume() {
299    sp<Snapshot> snapshot = (mSnapshot != NULL) ? mSnapshot : mFirstSnapshot;
300    glViewport(0, 0, snapshot->viewport.getWidth(), snapshot->viewport.getHeight());
301    glBindFramebuffer(GL_FRAMEBUFFER, snapshot->fbo);
302    debugOverdraw(true, false);
303
304    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
305
306    mCaches.scissorEnabled = glIsEnabled(GL_SCISSOR_TEST);
307    mCaches.enableScissor();
308    mCaches.resetScissor();
309    dirtyClip();
310
311    mCaches.activeTexture(0);
312
313    mCaches.blend = true;
314    glEnable(GL_BLEND);
315    glBlendFunc(mCaches.lastSrcMode, mCaches.lastDstMode);
316    glBlendEquation(GL_FUNC_ADD);
317}
318
319void OpenGLRenderer::resumeAfterLayer() {
320    sp<Snapshot> snapshot = (mSnapshot != NULL) ? mSnapshot : mFirstSnapshot;
321    glViewport(0, 0, snapshot->viewport.getWidth(), snapshot->viewport.getHeight());
322    glBindFramebuffer(GL_FRAMEBUFFER, snapshot->fbo);
323    debugOverdraw(true, false);
324
325    mCaches.resetScissor();
326    dirtyClip();
327}
328
329void OpenGLRenderer::detachFunctor(Functor* functor) {
330    mFunctors.remove(functor);
331}
332
333void OpenGLRenderer::attachFunctor(Functor* functor) {
334    mFunctors.add(functor);
335}
336
337status_t OpenGLRenderer::invokeFunctors(Rect& dirty) {
338    status_t result = DrawGlInfo::kStatusDone;
339    size_t count = mFunctors.size();
340
341    if (count > 0) {
342        SortedVector<Functor*> functors(mFunctors);
343        mFunctors.clear();
344
345        DrawGlInfo info;
346        info.clipLeft = 0;
347        info.clipTop = 0;
348        info.clipRight = 0;
349        info.clipBottom = 0;
350        info.isLayer = false;
351        info.width = 0;
352        info.height = 0;
353        memset(info.transform, 0, sizeof(float) * 16);
354
355        for (size_t i = 0; i < count; i++) {
356            Functor* f = functors.itemAt(i);
357            result |= (*f)(DrawGlInfo::kModeProcess, &info);
358
359            if (result & DrawGlInfo::kStatusDraw) {
360                Rect localDirty(info.dirtyLeft, info.dirtyTop, info.dirtyRight, info.dirtyBottom);
361                dirty.unionWith(localDirty);
362            }
363
364            if (result & DrawGlInfo::kStatusInvoke) {
365                mFunctors.add(f);
366            }
367        }
368        // protect against functors binding to other buffers
369        mCaches.unbindMeshBuffer();
370        mCaches.unbindIndicesBuffer();
371        mCaches.activeTexture(0);
372    }
373
374    return result;
375}
376
377status_t OpenGLRenderer::callDrawGLFunction(Functor* functor, Rect& dirty) {
378    interrupt();
379    detachFunctor(functor);
380
381    mCaches.enableScissor();
382    if (mDirtyClip) {
383        setScissorFromClip();
384    }
385
386    Rect clip(*mSnapshot->clipRect);
387    clip.snapToPixelBoundaries();
388
389    // Since we don't know what the functor will draw, let's dirty
390    // tne entire clip region
391    if (hasLayer()) {
392        dirtyLayerUnchecked(clip, getRegion());
393    }
394
395    DrawGlInfo info;
396    info.clipLeft = clip.left;
397    info.clipTop = clip.top;
398    info.clipRight = clip.right;
399    info.clipBottom = clip.bottom;
400    info.isLayer = hasLayer();
401    info.width = getSnapshot()->viewport.getWidth();
402    info.height = getSnapshot()->height;
403    getSnapshot()->transform->copyTo(&info.transform[0]);
404
405    status_t result = (*functor)(DrawGlInfo::kModeDraw, &info) | DrawGlInfo::kStatusDrew;
406
407    if (result != DrawGlInfo::kStatusDone) {
408        Rect localDirty(info.dirtyLeft, info.dirtyTop, info.dirtyRight, info.dirtyBottom);
409        dirty.unionWith(localDirty);
410
411        if (result & DrawGlInfo::kStatusInvoke) {
412            mFunctors.add(functor);
413        }
414    }
415
416    resume();
417    return result;
418}
419
420///////////////////////////////////////////////////////////////////////////////
421// Debug
422///////////////////////////////////////////////////////////////////////////////
423
424void OpenGLRenderer::startMark(const char* name) const {
425    mCaches.startMark(0, name);
426}
427
428void OpenGLRenderer::endMark() const {
429    mCaches.endMark();
430}
431
432void OpenGLRenderer::debugOverdraw(bool enable, bool clear) {
433    if (mCaches.debugOverdraw && getTargetFbo() == 0) {
434        if (clear) {
435            mCaches.disableScissor();
436            mCaches.stencil.clear();
437        }
438        if (enable) {
439            mCaches.stencil.enableDebugWrite();
440        } else {
441            mCaches.stencil.disable();
442        }
443    }
444}
445
446void OpenGLRenderer::renderOverdraw() {
447    if (mCaches.debugOverdraw && getTargetFbo() == 0) {
448        const Rect* clip = mTilingSnapshot->clipRect;
449
450        mCaches.enableScissor();
451        mCaches.setScissor(clip->left, mTilingSnapshot->height - clip->bottom,
452                clip->right - clip->left, clip->bottom - clip->top);
453
454        mCaches.stencil.enableDebugTest(2);
455        drawColor(0x2f0000ff, SkXfermode::kSrcOver_Mode);
456        mCaches.stencil.enableDebugTest(3);
457        drawColor(0x2f00ff00, SkXfermode::kSrcOver_Mode);
458        mCaches.stencil.enableDebugTest(4);
459        drawColor(0x3fff0000, SkXfermode::kSrcOver_Mode);
460        mCaches.stencil.enableDebugTest(4, true);
461        drawColor(0x7fff0000, SkXfermode::kSrcOver_Mode);
462        mCaches.stencil.disable();
463    }
464}
465
466///////////////////////////////////////////////////////////////////////////////
467// Layers
468///////////////////////////////////////////////////////////////////////////////
469
470bool OpenGLRenderer::updateLayer(Layer* layer, bool inFrame) {
471    if (layer->deferredUpdateScheduled && layer->renderer && layer->displayList) {
472        OpenGLRenderer* renderer = layer->renderer;
473        Rect& dirty = layer->dirtyRect;
474
475        if (inFrame) {
476            endTiling();
477            debugOverdraw(false, false);
478        }
479
480        renderer->setViewport(layer->layer.getWidth(), layer->layer.getHeight());
481        renderer->prepareDirty(dirty.left, dirty.top, dirty.right, dirty.bottom, !layer->isBlend());
482        renderer->drawDisplayList(layer->displayList, dirty, DisplayList::kReplayFlag_ClipChildren);
483        renderer->finish();
484
485        if (inFrame) {
486            resumeAfterLayer();
487            startTiling(mSnapshot);
488        }
489
490        dirty.setEmpty();
491        layer->deferredUpdateScheduled = false;
492        layer->renderer = NULL;
493        layer->displayList = NULL;
494
495        return true;
496    }
497
498    return false;
499}
500
501void OpenGLRenderer::updateLayers() {
502    int count = mLayerUpdates.size();
503    if (count > 0) {
504        startMark("Layer Updates");
505
506        // Note: it is very important to update the layers in reverse order
507        for (int i = count - 1; i >= 0; i--) {
508            Layer* layer = mLayerUpdates.itemAt(i);
509            updateLayer(layer, false);
510            mCaches.resourceCache.decrementRefcount(layer);
511        }
512        mLayerUpdates.clear();
513
514        glBindFramebuffer(GL_FRAMEBUFFER, getTargetFbo());
515        endMark();
516    }
517}
518
519void OpenGLRenderer::pushLayerUpdate(Layer* layer) {
520    if (layer) {
521        mLayerUpdates.push_back(layer);
522        mCaches.resourceCache.incrementRefcount(layer);
523    }
524}
525
526void OpenGLRenderer::clearLayerUpdates() {
527    size_t count = mLayerUpdates.size();
528    if (count > 0) {
529        mCaches.resourceCache.lock();
530        for (size_t i = 0; i < count; i++) {
531            mCaches.resourceCache.decrementRefcountLocked(mLayerUpdates.itemAt(i));
532        }
533        mCaches.resourceCache.unlock();
534        mLayerUpdates.clear();
535    }
536}
537
538///////////////////////////////////////////////////////////////////////////////
539// State management
540///////////////////////////////////////////////////////////////////////////////
541
542int OpenGLRenderer::getSaveCount() const {
543    return mSaveCount;
544}
545
546int OpenGLRenderer::save(int flags) {
547    return saveSnapshot(flags);
548}
549
550void OpenGLRenderer::restore() {
551    if (mSaveCount > 1) {
552        restoreSnapshot();
553    }
554}
555
556void OpenGLRenderer::restoreToCount(int saveCount) {
557    if (saveCount < 1) saveCount = 1;
558
559    while (mSaveCount > saveCount) {
560        restoreSnapshot();
561    }
562}
563
564int OpenGLRenderer::saveSnapshot(int flags) {
565    mSnapshot = new Snapshot(mSnapshot, flags);
566    return mSaveCount++;
567}
568
569bool OpenGLRenderer::restoreSnapshot() {
570    bool restoreClip = mSnapshot->flags & Snapshot::kFlagClipSet;
571    bool restoreLayer = mSnapshot->flags & Snapshot::kFlagIsLayer;
572    bool restoreOrtho = mSnapshot->flags & Snapshot::kFlagDirtyOrtho;
573
574    sp<Snapshot> current = mSnapshot;
575    sp<Snapshot> previous = mSnapshot->previous;
576
577    if (restoreOrtho) {
578        Rect& r = previous->viewport;
579        glViewport(r.left, r.top, r.right, r.bottom);
580        mOrthoMatrix.load(current->orthoMatrix);
581    }
582
583    mSaveCount--;
584    mSnapshot = previous;
585
586    if (restoreClip) {
587        dirtyClip();
588    }
589
590    if (restoreLayer) {
591        composeLayer(current, previous);
592    }
593
594    return restoreClip;
595}
596
597///////////////////////////////////////////////////////////////////////////////
598// Layers
599///////////////////////////////////////////////////////////////////////////////
600
601int OpenGLRenderer::saveLayer(float left, float top, float right, float bottom,
602        SkPaint* p, int flags) {
603    const GLuint previousFbo = mSnapshot->fbo;
604    const int count = saveSnapshot(flags);
605
606    if (!mSnapshot->isIgnored()) {
607        int alpha = 255;
608        SkXfermode::Mode mode;
609
610        if (p) {
611            alpha = p->getAlpha();
612            mode = getXfermode(p->getXfermode());
613        } else {
614            mode = SkXfermode::kSrcOver_Mode;
615        }
616
617        createLayer(left, top, right, bottom, alpha, mode, flags, previousFbo);
618    }
619
620    return count;
621}
622
623int OpenGLRenderer::saveLayerAlpha(float left, float top, float right, float bottom,
624        int alpha, int flags) {
625    if (alpha >= 255) {
626        return saveLayer(left, top, right, bottom, NULL, flags);
627    } else {
628        SkPaint paint;
629        paint.setAlpha(alpha);
630        return saveLayer(left, top, right, bottom, &paint, flags);
631    }
632}
633
634/**
635 * Layers are viewed by Skia are slightly different than layers in image editing
636 * programs (for instance.) When a layer is created, previously created layers
637 * and the frame buffer still receive every drawing command. For instance, if a
638 * layer is created and a shape intersecting the bounds of the layers and the
639 * framebuffer is draw, the shape will be drawn on both (unless the layer was
640 * created with the SkCanvas::kClipToLayer_SaveFlag flag.)
641 *
642 * A way to implement layers is to create an FBO for each layer, backed by an RGBA
643 * texture. Unfortunately, this is inefficient as it requires every primitive to
644 * be drawn n + 1 times, where n is the number of active layers. In practice this
645 * means, for every primitive:
646 *   - Switch active frame buffer
647 *   - Change viewport, clip and projection matrix
648 *   - Issue the drawing
649 *
650 * Switching rendering target n + 1 times per drawn primitive is extremely costly.
651 * To avoid this, layers are implemented in a different way here, at least in the
652 * general case. FBOs are used, as an optimization, when the "clip to layer" flag
653 * is set. When this flag is set we can redirect all drawing operations into a
654 * single FBO.
655 *
656 * This implementation relies on the frame buffer being at least RGBA 8888. When
657 * a layer is created, only a texture is created, not an FBO. The content of the
658 * frame buffer contained within the layer's bounds is copied into this texture
659 * using glCopyTexImage2D(). The layer's region is then cleared(1) in the frame
660 * buffer and drawing continues as normal. This technique therefore treats the
661 * frame buffer as a scratch buffer for the layers.
662 *
663 * To compose the layers back onto the frame buffer, each layer texture
664 * (containing the original frame buffer data) is drawn as a simple quad over
665 * the frame buffer. The trick is that the quad is set as the composition
666 * destination in the blending equation, and the frame buffer becomes the source
667 * of the composition.
668 *
669 * Drawing layers with an alpha value requires an extra step before composition.
670 * An empty quad is drawn over the layer's region in the frame buffer. This quad
671 * is drawn with the rgba color (0,0,0,alpha). The alpha value offered by the
672 * quad is used to multiply the colors in the frame buffer. This is achieved by
673 * changing the GL blend functions for the GL_FUNC_ADD blend equation to
674 * GL_ZERO, GL_SRC_ALPHA.
675 *
676 * Because glCopyTexImage2D() can be slow, an alternative implementation might
677 * be use to draw a single clipped layer. The implementation described above
678 * is correct in every case.
679 *
680 * (1) The frame buffer is actually not cleared right away. To allow the GPU
681 *     to potentially optimize series of calls to glCopyTexImage2D, the frame
682 *     buffer is left untouched until the first drawing operation. Only when
683 *     something actually gets drawn are the layers regions cleared.
684 */
685bool OpenGLRenderer::createLayer(float left, float top, float right, float bottom,
686        int alpha, SkXfermode::Mode mode, int flags, GLuint previousFbo) {
687    LAYER_LOGD("Requesting layer %.2fx%.2f", right - left, bottom - top);
688    LAYER_LOGD("Layer cache size = %d", mCaches.layerCache.getSize());
689
690    const bool fboLayer = flags & SkCanvas::kClipToLayer_SaveFlag;
691
692    // Window coordinates of the layer
693    Rect clip;
694    Rect bounds(left, top, right, bottom);
695    Rect untransformedBounds(bounds);
696    mSnapshot->transform->mapRect(bounds);
697
698    // Layers only make sense if they are in the framebuffer's bounds
699    if (bounds.intersect(*mSnapshot->clipRect)) {
700        // We cannot work with sub-pixels in this case
701        bounds.snapToPixelBoundaries();
702
703        // When the layer is not an FBO, we may use glCopyTexImage so we
704        // need to make sure the layer does not extend outside the bounds
705        // of the framebuffer
706        if (!bounds.intersect(mSnapshot->previous->viewport)) {
707            bounds.setEmpty();
708        } else if (fboLayer) {
709            clip.set(bounds);
710            mat4 inverse;
711            inverse.loadInverse(*mSnapshot->transform);
712            inverse.mapRect(clip);
713            clip.snapToPixelBoundaries();
714            if (clip.intersect(untransformedBounds)) {
715                clip.translate(-left, -top);
716                bounds.set(untransformedBounds);
717            } else {
718                clip.setEmpty();
719            }
720        }
721    } else {
722        bounds.setEmpty();
723    }
724
725    if (bounds.isEmpty() || bounds.getWidth() > mCaches.maxTextureSize ||
726            bounds.getHeight() > mCaches.maxTextureSize ||
727            (fboLayer && clip.isEmpty())) {
728        mSnapshot->empty = fboLayer;
729    } else {
730        mSnapshot->invisible = mSnapshot->invisible || (alpha <= ALPHA_THRESHOLD && fboLayer);
731    }
732
733    // Bail out if we won't draw in this snapshot
734    if (mSnapshot->invisible || mSnapshot->empty) {
735        return false;
736    }
737
738    mCaches.activeTexture(0);
739    Layer* layer = mCaches.layerCache.get(bounds.getWidth(), bounds.getHeight());
740    if (!layer) {
741        return false;
742    }
743
744    layer->setAlpha(alpha, mode);
745    layer->layer.set(bounds);
746    layer->texCoords.set(0.0f, bounds.getHeight() / float(layer->getHeight()),
747            bounds.getWidth() / float(layer->getWidth()), 0.0f);
748    layer->setColorFilter(mColorFilter);
749    layer->setBlend(true);
750    layer->setDirty(false);
751
752    // Save the layer in the snapshot
753    mSnapshot->flags |= Snapshot::kFlagIsLayer;
754    mSnapshot->layer = layer;
755
756    if (fboLayer) {
757        return createFboLayer(layer, bounds, clip, previousFbo);
758    } else {
759        // Copy the framebuffer into the layer
760        layer->bindTexture();
761        if (!bounds.isEmpty()) {
762            if (layer->isEmpty()) {
763                glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
764                        bounds.left, mSnapshot->height - bounds.bottom,
765                        layer->getWidth(), layer->getHeight(), 0);
766                layer->setEmpty(false);
767            } else {
768                glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, bounds.left,
769                        mSnapshot->height - bounds.bottom, bounds.getWidth(), bounds.getHeight());
770            }
771
772            // Enqueue the buffer coordinates to clear the corresponding region later
773            mLayers.push(new Rect(bounds));
774        }
775    }
776
777    return true;
778}
779
780bool OpenGLRenderer::createFboLayer(Layer* layer, Rect& bounds, Rect& clip, GLuint previousFbo) {
781    layer->setFbo(mCaches.fboCache.get());
782
783    mSnapshot->region = &mSnapshot->layer->region;
784    mSnapshot->flags |= Snapshot::kFlagFboTarget;
785
786    mSnapshot->flags |= Snapshot::kFlagIsFboLayer;
787    mSnapshot->fbo = layer->getFbo();
788    mSnapshot->resetTransform(-bounds.left, -bounds.top, 0.0f);
789    mSnapshot->resetClip(clip.left, clip.top, clip.right, clip.bottom);
790    mSnapshot->viewport.set(0.0f, 0.0f, bounds.getWidth(), bounds.getHeight());
791    mSnapshot->height = bounds.getHeight();
792    mSnapshot->flags |= Snapshot::kFlagDirtyOrtho;
793    mSnapshot->orthoMatrix.load(mOrthoMatrix);
794
795    endTiling();
796    debugOverdraw(false, false);
797    // Bind texture to FBO
798    glBindFramebuffer(GL_FRAMEBUFFER, layer->getFbo());
799    layer->bindTexture();
800
801    // Initialize the texture if needed
802    if (layer->isEmpty()) {
803        layer->allocateTexture(GL_RGBA, GL_UNSIGNED_BYTE);
804        layer->setEmpty(false);
805    }
806
807    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
808            layer->getTexture(), 0);
809
810    startTiling(mSnapshot);
811
812    // Clear the FBO, expand the clear region by 1 to get nice bilinear filtering
813    mCaches.enableScissor();
814    mCaches.setScissor(clip.left - 1.0f, bounds.getHeight() - clip.bottom - 1.0f,
815            clip.getWidth() + 2.0f, clip.getHeight() + 2.0f);
816    glClear(GL_COLOR_BUFFER_BIT);
817
818    dirtyClip();
819
820    // Change the ortho projection
821    glViewport(0, 0, bounds.getWidth(), bounds.getHeight());
822    mOrthoMatrix.loadOrtho(0.0f, bounds.getWidth(), bounds.getHeight(), 0.0f, -1.0f, 1.0f);
823
824    return true;
825}
826
827/**
828 * Read the documentation of createLayer() before doing anything in this method.
829 */
830void OpenGLRenderer::composeLayer(sp<Snapshot> current, sp<Snapshot> previous) {
831    if (!current->layer) {
832        ALOGE("Attempting to compose a layer that does not exist");
833        return;
834    }
835
836    const bool fboLayer = current->flags & Snapshot::kFlagIsFboLayer;
837
838    if (fboLayer) {
839        endTiling();
840
841        // Detach the texture from the FBO
842        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0);
843        // Unbind current FBO and restore previous one
844        glBindFramebuffer(GL_FRAMEBUFFER, previous->fbo);
845        debugOverdraw(true, false);
846
847        startTiling(previous);
848    }
849
850    Layer* layer = current->layer;
851    const Rect& rect = layer->layer;
852
853    if (!fboLayer && layer->getAlpha() < 255) {
854        drawColorRect(rect.left, rect.top, rect.right, rect.bottom,
855                layer->getAlpha() << 24, SkXfermode::kDstIn_Mode, true);
856        // Required below, composeLayerRect() will divide by 255
857        layer->setAlpha(255);
858    }
859
860    mCaches.unbindMeshBuffer();
861
862    mCaches.activeTexture(0);
863
864    // When the layer is stored in an FBO, we can save a bit of fillrate by
865    // drawing only the dirty region
866    if (fboLayer) {
867        dirtyLayer(rect.left, rect.top, rect.right, rect.bottom, *previous->transform);
868        if (layer->getColorFilter()) {
869            setupColorFilter(layer->getColorFilter());
870        }
871        composeLayerRegion(layer, rect);
872        if (layer->getColorFilter()) {
873            resetColorFilter();
874        }
875    } else if (!rect.isEmpty()) {
876        dirtyLayer(rect.left, rect.top, rect.right, rect.bottom);
877        composeLayerRect(layer, rect, true);
878    }
879
880    if (fboLayer) {
881        // Note: No need to use glDiscardFramebufferEXT() since we never
882        //       create/compose layers that are not on screen with this
883        //       code path
884        // See LayerRenderer::destroyLayer(Layer*)
885
886        // Put the FBO name back in the cache, if it doesn't fit, it will be destroyed
887        mCaches.fboCache.put(current->fbo);
888        layer->setFbo(0);
889    }
890
891    dirtyClip();
892
893    // Failing to add the layer to the cache should happen only if the layer is too large
894    if (!mCaches.layerCache.put(layer)) {
895        LAYER_LOGD("Deleting layer");
896        Caches::getInstance().resourceCache.decrementRefcount(layer);
897    }
898}
899
900void OpenGLRenderer::drawTextureLayer(Layer* layer, const Rect& rect) {
901    float alpha = layer->getAlpha() / 255.0f;
902
903    setupDraw();
904    if (layer->getRenderTarget() == GL_TEXTURE_2D) {
905        setupDrawWithTexture();
906    } else {
907        setupDrawWithExternalTexture();
908    }
909    setupDrawTextureTransform();
910    setupDrawColor(alpha, alpha, alpha, alpha);
911    setupDrawColorFilter();
912    setupDrawBlending(layer->isBlend() || alpha < 1.0f, layer->getMode());
913    setupDrawProgram();
914    setupDrawPureColorUniforms();
915    setupDrawColorFilterUniforms();
916    if (layer->getRenderTarget() == GL_TEXTURE_2D) {
917        setupDrawTexture(layer->getTexture());
918    } else {
919        setupDrawExternalTexture(layer->getTexture());
920    }
921    if (mSnapshot->transform->isPureTranslate() &&
922            layer->getWidth() == (uint32_t) rect.getWidth() &&
923            layer->getHeight() == (uint32_t) rect.getHeight()) {
924        const float x = (int) floorf(rect.left + mSnapshot->transform->getTranslateX() + 0.5f);
925        const float y = (int) floorf(rect.top + mSnapshot->transform->getTranslateY() + 0.5f);
926
927        layer->setFilter(GL_NEAREST);
928        setupDrawModelView(x, y, x + rect.getWidth(), y + rect.getHeight(), true);
929    } else {
930        layer->setFilter(GL_LINEAR);
931        setupDrawModelView(rect.left, rect.top, rect.right, rect.bottom);
932    }
933    setupDrawTextureTransformUniforms(layer->getTexTransform());
934    setupDrawMesh(&mMeshVertices[0].position[0], &mMeshVertices[0].texture[0]);
935
936    glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
937
938    finishDrawTexture();
939}
940
941void OpenGLRenderer::composeLayerRect(Layer* layer, const Rect& rect, bool swap) {
942    if (!layer->isTextureLayer()) {
943        const Rect& texCoords = layer->texCoords;
944        resetDrawTextureTexCoords(texCoords.left, texCoords.top,
945                texCoords.right, texCoords.bottom);
946
947        float x = rect.left;
948        float y = rect.top;
949        bool simpleTransform = mSnapshot->transform->isPureTranslate() &&
950                layer->getWidth() == (uint32_t) rect.getWidth() &&
951                layer->getHeight() == (uint32_t) rect.getHeight();
952
953        if (simpleTransform) {
954            // When we're swapping, the layer is already in screen coordinates
955            if (!swap) {
956                x = (int) floorf(rect.left + mSnapshot->transform->getTranslateX() + 0.5f);
957                y = (int) floorf(rect.top + mSnapshot->transform->getTranslateY() + 0.5f);
958            }
959
960            layer->setFilter(GL_NEAREST, true);
961        } else {
962            layer->setFilter(GL_LINEAR, true);
963        }
964
965        drawTextureMesh(x, y, x + rect.getWidth(), y + rect.getHeight(),
966                layer->getTexture(), layer->getAlpha() / 255.0f,
967                layer->getMode(), layer->isBlend(),
968                &mMeshVertices[0].position[0], &mMeshVertices[0].texture[0],
969                GL_TRIANGLE_STRIP, gMeshCount, swap, swap || simpleTransform);
970
971        resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f);
972    } else {
973        resetDrawTextureTexCoords(0.0f, 1.0f, 1.0f, 0.0f);
974        drawTextureLayer(layer, rect);
975        resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f);
976    }
977}
978
979void OpenGLRenderer::composeLayerRegion(Layer* layer, const Rect& rect) {
980    if (layer->region.isRect()) {
981        layer->setRegionAsRect();
982
983        composeLayerRect(layer, layer->regionRect);
984
985        layer->region.clear();
986        return;
987    }
988
989    // TODO: See LayerRenderer.cpp::generateMesh() for important
990    //       information about this implementation
991    if (CC_LIKELY(!layer->region.isEmpty())) {
992        size_t count;
993        const android::Rect* rects = layer->region.getArray(&count);
994
995        const float alpha = layer->getAlpha() / 255.0f;
996        const float texX = 1.0f / float(layer->getWidth());
997        const float texY = 1.0f / float(layer->getHeight());
998        const float height = rect.getHeight();
999
1000        TextureVertex* mesh = mCaches.getRegionMesh();
1001        GLsizei numQuads = 0;
1002
1003        setupDraw();
1004        setupDrawWithTexture();
1005        setupDrawColor(alpha, alpha, alpha, alpha);
1006        setupDrawColorFilter();
1007        setupDrawBlending(layer->isBlend() || alpha < 1.0f, layer->getMode(), false);
1008        setupDrawProgram();
1009        setupDrawDirtyRegionsDisabled();
1010        setupDrawPureColorUniforms();
1011        setupDrawColorFilterUniforms();
1012        setupDrawTexture(layer->getTexture());
1013        if (mSnapshot->transform->isPureTranslate()) {
1014            const float x = (int) floorf(rect.left + mSnapshot->transform->getTranslateX() + 0.5f);
1015            const float y = (int) floorf(rect.top + mSnapshot->transform->getTranslateY() + 0.5f);
1016
1017            layer->setFilter(GL_NEAREST);
1018            setupDrawModelViewTranslate(x, y, x + rect.getWidth(), y + rect.getHeight(), true);
1019        } else {
1020            layer->setFilter(GL_LINEAR);
1021            setupDrawModelViewTranslate(rect.left, rect.top, rect.right, rect.bottom);
1022        }
1023        setupDrawMeshIndices(&mesh[0].position[0], &mesh[0].texture[0]);
1024
1025        for (size_t i = 0; i < count; i++) {
1026            const android::Rect* r = &rects[i];
1027
1028            const float u1 = r->left * texX;
1029            const float v1 = (height - r->top) * texY;
1030            const float u2 = r->right * texX;
1031            const float v2 = (height - r->bottom) * texY;
1032
1033            // TODO: Reject quads outside of the clip
1034            TextureVertex::set(mesh++, r->left, r->top, u1, v1);
1035            TextureVertex::set(mesh++, r->right, r->top, u2, v1);
1036            TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
1037            TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
1038
1039            numQuads++;
1040
1041            if (numQuads >= REGION_MESH_QUAD_COUNT) {
1042                glDrawElements(GL_TRIANGLES, numQuads * 6, GL_UNSIGNED_SHORT, NULL);
1043                numQuads = 0;
1044                mesh = mCaches.getRegionMesh();
1045            }
1046        }
1047
1048        if (numQuads > 0) {
1049            glDrawElements(GL_TRIANGLES, numQuads * 6, GL_UNSIGNED_SHORT, NULL);
1050        }
1051
1052        finishDrawTexture();
1053
1054#if DEBUG_LAYERS_AS_REGIONS
1055        drawRegionRects(layer->region);
1056#endif
1057
1058        layer->region.clear();
1059    }
1060}
1061
1062void OpenGLRenderer::drawRegionRects(const Region& region) {
1063#if DEBUG_LAYERS_AS_REGIONS
1064    size_t count;
1065    const android::Rect* rects = region.getArray(&count);
1066
1067    uint32_t colors[] = {
1068            0x7fff0000, 0x7f00ff00,
1069            0x7f0000ff, 0x7fff00ff,
1070    };
1071
1072    int offset = 0;
1073    int32_t top = rects[0].top;
1074
1075    for (size_t i = 0; i < count; i++) {
1076        if (top != rects[i].top) {
1077            offset ^= 0x2;
1078            top = rects[i].top;
1079        }
1080
1081        Rect r(rects[i].left, rects[i].top, rects[i].right, rects[i].bottom);
1082        drawColorRect(r.left, r.top, r.right, r.bottom, colors[offset + (i & 0x1)],
1083                SkXfermode::kSrcOver_Mode);
1084    }
1085#endif
1086}
1087
1088void OpenGLRenderer::dirtyLayer(const float left, const float top,
1089        const float right, const float bottom, const mat4 transform) {
1090    if (hasLayer()) {
1091        Rect bounds(left, top, right, bottom);
1092        transform.mapRect(bounds);
1093        dirtyLayerUnchecked(bounds, getRegion());
1094    }
1095}
1096
1097void OpenGLRenderer::dirtyLayer(const float left, const float top,
1098        const float right, const float bottom) {
1099    if (hasLayer()) {
1100        Rect bounds(left, top, right, bottom);
1101        dirtyLayerUnchecked(bounds, getRegion());
1102    }
1103}
1104
1105void OpenGLRenderer::dirtyLayerUnchecked(Rect& bounds, Region* region) {
1106    if (bounds.intersect(*mSnapshot->clipRect)) {
1107        bounds.snapToPixelBoundaries();
1108        android::Rect dirty(bounds.left, bounds.top, bounds.right, bounds.bottom);
1109        if (!dirty.isEmpty()) {
1110            region->orSelf(dirty);
1111        }
1112    }
1113}
1114
1115void OpenGLRenderer::clearLayerRegions() {
1116    const size_t count = mLayers.size();
1117    if (count == 0) return;
1118
1119    if (!mSnapshot->isIgnored()) {
1120        // Doing several glScissor/glClear here can negatively impact
1121        // GPUs with a tiler architecture, instead we draw quads with
1122        // the Clear blending mode
1123
1124        // The list contains bounds that have already been clipped
1125        // against their initial clip rect, and the current clip
1126        // is likely different so we need to disable clipping here
1127        bool scissorChanged = mCaches.disableScissor();
1128
1129        Vertex mesh[count * 6];
1130        Vertex* vertex = mesh;
1131
1132        for (uint32_t i = 0; i < count; i++) {
1133            Rect* bounds = mLayers.itemAt(i);
1134
1135            Vertex::set(vertex++, bounds->left, bounds->bottom);
1136            Vertex::set(vertex++, bounds->left, bounds->top);
1137            Vertex::set(vertex++, bounds->right, bounds->top);
1138            Vertex::set(vertex++, bounds->left, bounds->bottom);
1139            Vertex::set(vertex++, bounds->right, bounds->top);
1140            Vertex::set(vertex++, bounds->right, bounds->bottom);
1141
1142            delete bounds;
1143        }
1144
1145        setupDraw(false);
1146        setupDrawColor(0.0f, 0.0f, 0.0f, 1.0f);
1147        setupDrawBlending(true, SkXfermode::kClear_Mode);
1148        setupDrawProgram();
1149        setupDrawPureColorUniforms();
1150        setupDrawModelViewTranslate(0.0f, 0.0f, 0.0f, 0.0f, true);
1151        setupDrawVertices(&mesh[0].position[0]);
1152
1153        glDrawArrays(GL_TRIANGLES, 0, count * 6);
1154
1155        if (scissorChanged) mCaches.enableScissor();
1156    } else {
1157        for (uint32_t i = 0; i < count; i++) {
1158            delete mLayers.itemAt(i);
1159        }
1160    }
1161
1162    mLayers.clear();
1163}
1164
1165///////////////////////////////////////////////////////////////////////////////
1166// Transforms
1167///////////////////////////////////////////////////////////////////////////////
1168
1169void OpenGLRenderer::translate(float dx, float dy) {
1170    mSnapshot->transform->translate(dx, dy, 0.0f);
1171}
1172
1173void OpenGLRenderer::rotate(float degrees) {
1174    mSnapshot->transform->rotate(degrees, 0.0f, 0.0f, 1.0f);
1175}
1176
1177void OpenGLRenderer::scale(float sx, float sy) {
1178    mSnapshot->transform->scale(sx, sy, 1.0f);
1179}
1180
1181void OpenGLRenderer::skew(float sx, float sy) {
1182    mSnapshot->transform->skew(sx, sy);
1183}
1184
1185void OpenGLRenderer::setMatrix(SkMatrix* matrix) {
1186    if (matrix) {
1187        mSnapshot->transform->load(*matrix);
1188    } else {
1189        mSnapshot->transform->loadIdentity();
1190    }
1191}
1192
1193void OpenGLRenderer::getMatrix(SkMatrix* matrix) {
1194    mSnapshot->transform->copyTo(*matrix);
1195}
1196
1197void OpenGLRenderer::concatMatrix(SkMatrix* matrix) {
1198    SkMatrix transform;
1199    mSnapshot->transform->copyTo(transform);
1200    transform.preConcat(*matrix);
1201    mSnapshot->transform->load(transform);
1202}
1203
1204///////////////////////////////////////////////////////////////////////////////
1205// Clipping
1206///////////////////////////////////////////////////////////////////////////////
1207
1208void OpenGLRenderer::setScissorFromClip() {
1209    Rect clip(*mSnapshot->clipRect);
1210    clip.snapToPixelBoundaries();
1211
1212    if (mCaches.setScissor(clip.left, mSnapshot->height - clip.bottom,
1213            clip.getWidth(), clip.getHeight())) {
1214        mDirtyClip = false;
1215    }
1216}
1217
1218const Rect& OpenGLRenderer::getClipBounds() {
1219    return mSnapshot->getLocalClip();
1220}
1221
1222bool OpenGLRenderer::quickRejectNoScissor(float left, float top, float right, float bottom) {
1223    if (mSnapshot->isIgnored()) {
1224        return true;
1225    }
1226
1227    Rect r(left, top, right, bottom);
1228    mSnapshot->transform->mapRect(r);
1229    r.snapToPixelBoundaries();
1230
1231    Rect clipRect(*mSnapshot->clipRect);
1232    clipRect.snapToPixelBoundaries();
1233
1234    return !clipRect.intersects(r);
1235}
1236
1237bool OpenGLRenderer::quickRejectNoScissor(float left, float top, float right, float bottom,
1238        Rect& transformed, Rect& clip) {
1239    if (mSnapshot->isIgnored()) {
1240        return true;
1241    }
1242
1243    transformed.set(left, top, right, bottom);
1244    mSnapshot->transform->mapRect(transformed);
1245    transformed.snapToPixelBoundaries();
1246
1247    clip.set(*mSnapshot->clipRect);
1248    clip.snapToPixelBoundaries();
1249
1250    return !clip.intersects(transformed);
1251}
1252
1253bool OpenGLRenderer::quickRejectPreStroke(float left, float top, float right, float bottom, SkPaint* paint) {
1254    if (paint->getStyle() != SkPaint::kFill_Style) {
1255        float outset = paint->getStrokeWidth() * 0.5f;
1256        return quickReject(left - outset, top - outset, right + outset, bottom + outset);
1257    } else {
1258        return quickReject(left, top, right, bottom);
1259    }
1260}
1261
1262bool OpenGLRenderer::quickReject(float left, float top, float right, float bottom) {
1263    if (mSnapshot->isIgnored() || bottom <= top || right <= left) {
1264        return true;
1265    }
1266
1267    Rect r(left, top, right, bottom);
1268    mSnapshot->transform->mapRect(r);
1269    r.snapToPixelBoundaries();
1270
1271    Rect clipRect(*mSnapshot->clipRect);
1272    clipRect.snapToPixelBoundaries();
1273
1274    bool rejected = !clipRect.intersects(r);
1275    if (!isDeferred() && !rejected) {
1276        mCaches.setScissorEnabled(mScissorOptimizationDisabled || !clipRect.contains(r));
1277    }
1278
1279    return rejected;
1280}
1281
1282bool OpenGLRenderer::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) {
1283    bool clipped = mSnapshot->clip(left, top, right, bottom, op);
1284    if (clipped) {
1285        dirtyClip();
1286    }
1287    return !mSnapshot->clipRect->isEmpty();
1288}
1289
1290Rect* OpenGLRenderer::getClipRect() {
1291    return mSnapshot->clipRect;
1292}
1293
1294///////////////////////////////////////////////////////////////////////////////
1295// Drawing commands
1296///////////////////////////////////////////////////////////////////////////////
1297
1298void OpenGLRenderer::setupDraw(bool clear) {
1299    // TODO: It would be best if we could do this before quickReject()
1300    //       changes the scissor test state
1301    if (clear) clearLayerRegions();
1302    if (mDirtyClip) {
1303        setScissorFromClip();
1304    }
1305    mDescription.reset();
1306    mSetShaderColor = false;
1307    mColorSet = false;
1308    mColorA = mColorR = mColorG = mColorB = 0.0f;
1309    mTextureUnit = 0;
1310    mTrackDirtyRegions = true;
1311}
1312
1313void OpenGLRenderer::setupDrawWithTexture(bool isAlpha8) {
1314    mDescription.hasTexture = true;
1315    mDescription.hasAlpha8Texture = isAlpha8;
1316}
1317
1318void OpenGLRenderer::setupDrawWithExternalTexture() {
1319    mDescription.hasExternalTexture = true;
1320}
1321
1322void OpenGLRenderer::setupDrawNoTexture() {
1323    mCaches.disbaleTexCoordsVertexArray();
1324}
1325
1326void OpenGLRenderer::setupDrawAA() {
1327    mDescription.isAA = true;
1328}
1329
1330void OpenGLRenderer::setupDrawVertexShape() {
1331    mDescription.isVertexShape = true;
1332}
1333
1334void OpenGLRenderer::setupDrawPoint(float pointSize) {
1335    mDescription.isPoint = true;
1336    mDescription.pointSize = pointSize;
1337}
1338
1339void OpenGLRenderer::setupDrawColor(int color) {
1340    setupDrawColor(color, (color >> 24) & 0xFF);
1341}
1342
1343void OpenGLRenderer::setupDrawColor(int color, int alpha) {
1344    mColorA = alpha / 255.0f;
1345    // Second divide of a by 255 is an optimization, allowing us to simply multiply
1346    // the rgb values by a instead of also dividing by 255
1347    const float a = mColorA / 255.0f;
1348    mColorR = a * ((color >> 16) & 0xFF);
1349    mColorG = a * ((color >>  8) & 0xFF);
1350    mColorB = a * ((color      ) & 0xFF);
1351    mColorSet = true;
1352    mSetShaderColor = mDescription.setColor(mColorR, mColorG, mColorB, mColorA);
1353}
1354
1355void OpenGLRenderer::setupDrawAlpha8Color(int color, int alpha) {
1356    mColorA = alpha / 255.0f;
1357    // Double-divide of a by 255 is an optimization, allowing us to simply multiply
1358    // the rgb values by a instead of also dividing by 255
1359    const float a = mColorA / 255.0f;
1360    mColorR = a * ((color >> 16) & 0xFF);
1361    mColorG = a * ((color >>  8) & 0xFF);
1362    mColorB = a * ((color      ) & 0xFF);
1363    mColorSet = true;
1364    mSetShaderColor = mDescription.setAlpha8Color(mColorR, mColorG, mColorB, mColorA);
1365}
1366
1367void OpenGLRenderer::setupDrawTextGamma(const SkPaint* paint) {
1368    mCaches.fontRenderer->describe(mDescription, paint);
1369}
1370
1371void OpenGLRenderer::setupDrawColor(float r, float g, float b, float a) {
1372    mColorA = a;
1373    mColorR = r;
1374    mColorG = g;
1375    mColorB = b;
1376    mColorSet = true;
1377    mSetShaderColor = mDescription.setColor(r, g, b, a);
1378}
1379
1380void OpenGLRenderer::setupDrawShader() {
1381    if (mShader) {
1382        mShader->describe(mDescription, mCaches.extensions);
1383    }
1384}
1385
1386void OpenGLRenderer::setupDrawColorFilter() {
1387    if (mColorFilter) {
1388        mColorFilter->describe(mDescription, mCaches.extensions);
1389    }
1390}
1391
1392void OpenGLRenderer::accountForClear(SkXfermode::Mode mode) {
1393    if (mColorSet && mode == SkXfermode::kClear_Mode) {
1394        mColorA = 1.0f;
1395        mColorR = mColorG = mColorB = 0.0f;
1396        mSetShaderColor = mDescription.modulate = true;
1397    }
1398}
1399
1400void OpenGLRenderer::setupDrawBlending(SkXfermode::Mode mode, bool swapSrcDst) {
1401    // When the blending mode is kClear_Mode, we need to use a modulate color
1402    // argb=1,0,0,0
1403    accountForClear(mode);
1404    chooseBlending((mColorSet && mColorA < 1.0f) || (mShader && mShader->blend()), mode,
1405            mDescription, swapSrcDst);
1406}
1407
1408void OpenGLRenderer::setupDrawBlending(bool blend, SkXfermode::Mode mode, bool swapSrcDst) {
1409    // When the blending mode is kClear_Mode, we need to use a modulate color
1410    // argb=1,0,0,0
1411    accountForClear(mode);
1412    chooseBlending(blend || (mColorSet && mColorA < 1.0f) || (mShader && mShader->blend()) ||
1413            (mColorFilter && mColorFilter->blend()), mode, mDescription, swapSrcDst);
1414}
1415
1416void OpenGLRenderer::setupDrawProgram() {
1417    useProgram(mCaches.programCache.get(mDescription));
1418}
1419
1420void OpenGLRenderer::setupDrawDirtyRegionsDisabled() {
1421    mTrackDirtyRegions = false;
1422}
1423
1424void OpenGLRenderer::setupDrawModelViewTranslate(float left, float top, float right, float bottom,
1425        bool ignoreTransform) {
1426    mModelView.loadTranslate(left, top, 0.0f);
1427    if (!ignoreTransform) {
1428        mCaches.currentProgram->set(mOrthoMatrix, mModelView, *mSnapshot->transform);
1429        if (mTrackDirtyRegions) dirtyLayer(left, top, right, bottom, *mSnapshot->transform);
1430    } else {
1431        mCaches.currentProgram->set(mOrthoMatrix, mModelView, mIdentity);
1432        if (mTrackDirtyRegions) dirtyLayer(left, top, right, bottom);
1433    }
1434}
1435
1436void OpenGLRenderer::setupDrawModelViewIdentity(bool offset) {
1437    mCaches.currentProgram->set(mOrthoMatrix, mIdentity, *mSnapshot->transform, offset);
1438}
1439
1440void OpenGLRenderer::setupDrawModelView(float left, float top, float right, float bottom,
1441        bool ignoreTransform, bool ignoreModelView) {
1442    if (!ignoreModelView) {
1443        mModelView.loadTranslate(left, top, 0.0f);
1444        mModelView.scale(right - left, bottom - top, 1.0f);
1445    } else {
1446        mModelView.loadIdentity();
1447    }
1448    bool dirty = right - left > 0.0f && bottom - top > 0.0f;
1449    if (!ignoreTransform) {
1450        mCaches.currentProgram->set(mOrthoMatrix, mModelView, *mSnapshot->transform);
1451        if (mTrackDirtyRegions && dirty) {
1452            dirtyLayer(left, top, right, bottom, *mSnapshot->transform);
1453        }
1454    } else {
1455        mCaches.currentProgram->set(mOrthoMatrix, mModelView, mIdentity);
1456        if (mTrackDirtyRegions && dirty) dirtyLayer(left, top, right, bottom);
1457    }
1458}
1459
1460void OpenGLRenderer::setupDrawPointUniforms() {
1461    int slot = mCaches.currentProgram->getUniform("pointSize");
1462    glUniform1f(slot, mDescription.pointSize);
1463}
1464
1465void OpenGLRenderer::setupDrawColorUniforms() {
1466    if ((mColorSet && !mShader) || (mShader && mSetShaderColor)) {
1467        mCaches.currentProgram->setColor(mColorR, mColorG, mColorB, mColorA);
1468    }
1469}
1470
1471void OpenGLRenderer::setupDrawPureColorUniforms() {
1472    if (mSetShaderColor) {
1473        mCaches.currentProgram->setColor(mColorR, mColorG, mColorB, mColorA);
1474    }
1475}
1476
1477void OpenGLRenderer::setupDrawShaderUniforms(bool ignoreTransform) {
1478    if (mShader) {
1479        if (ignoreTransform) {
1480            mModelView.loadInverse(*mSnapshot->transform);
1481        }
1482        mShader->setupProgram(mCaches.currentProgram, mModelView, *mSnapshot, &mTextureUnit);
1483    }
1484}
1485
1486void OpenGLRenderer::setupDrawShaderIdentityUniforms() {
1487    if (mShader) {
1488        mShader->setupProgram(mCaches.currentProgram, mIdentity, *mSnapshot, &mTextureUnit);
1489    }
1490}
1491
1492void OpenGLRenderer::setupDrawColorFilterUniforms() {
1493    if (mColorFilter) {
1494        mColorFilter->setupProgram(mCaches.currentProgram);
1495    }
1496}
1497
1498void OpenGLRenderer::setupDrawTextGammaUniforms() {
1499    mCaches.fontRenderer->setupProgram(mDescription, mCaches.currentProgram);
1500}
1501
1502void OpenGLRenderer::setupDrawSimpleMesh() {
1503    bool force = mCaches.bindMeshBuffer();
1504    mCaches.bindPositionVertexPointer(force, 0);
1505    mCaches.unbindIndicesBuffer();
1506}
1507
1508void OpenGLRenderer::setupDrawTexture(GLuint texture) {
1509    bindTexture(texture);
1510    mTextureUnit++;
1511    mCaches.enableTexCoordsVertexArray();
1512}
1513
1514void OpenGLRenderer::setupDrawExternalTexture(GLuint texture) {
1515    bindExternalTexture(texture);
1516    mTextureUnit++;
1517    mCaches.enableTexCoordsVertexArray();
1518}
1519
1520void OpenGLRenderer::setupDrawTextureTransform() {
1521    mDescription.hasTextureTransform = true;
1522}
1523
1524void OpenGLRenderer::setupDrawTextureTransformUniforms(mat4& transform) {
1525    glUniformMatrix4fv(mCaches.currentProgram->getUniform("mainTextureTransform"), 1,
1526            GL_FALSE, &transform.data[0]);
1527}
1528
1529void OpenGLRenderer::setupDrawMesh(GLvoid* vertices, GLvoid* texCoords, GLuint vbo) {
1530    bool force = false;
1531    if (!vertices) {
1532        force = mCaches.bindMeshBuffer(vbo == 0 ? mCaches.meshBuffer : vbo);
1533    } else {
1534        force = mCaches.unbindMeshBuffer();
1535    }
1536
1537    mCaches.bindPositionVertexPointer(force, vertices);
1538    if (mCaches.currentProgram->texCoords >= 0) {
1539        mCaches.bindTexCoordsVertexPointer(force, texCoords);
1540    }
1541
1542    mCaches.unbindIndicesBuffer();
1543}
1544
1545void OpenGLRenderer::setupDrawMeshIndices(GLvoid* vertices, GLvoid* texCoords) {
1546    bool force = mCaches.unbindMeshBuffer();
1547    mCaches.bindPositionVertexPointer(force, vertices);
1548    if (mCaches.currentProgram->texCoords >= 0) {
1549        mCaches.bindTexCoordsVertexPointer(force, texCoords);
1550    }
1551}
1552
1553void OpenGLRenderer::setupDrawVertices(GLvoid* vertices) {
1554    bool force = mCaches.unbindMeshBuffer();
1555    mCaches.bindPositionVertexPointer(force, vertices, gVertexStride);
1556    mCaches.unbindIndicesBuffer();
1557}
1558
1559/**
1560 * Sets up the shader to draw an AA line. We draw AA lines with quads, where there is an
1561 * outer boundary that fades out to 0. The variables set in the shader define the proportion of
1562 * the width and length of the primitive occupied by the AA region. The vtxWidth and vtxLength
1563 * attributes (one per vertex) are values from zero to one that tells the fragment
1564 * shader where the fragment is in relation to the line width/length overall; these values are
1565 * then used to compute the proper color, based on whether the fragment lies in the fading AA
1566 * region of the line.
1567 * Note that we only pass down the width values in this setup function. The length coordinates
1568 * are set up for each individual segment.
1569 */
1570void OpenGLRenderer::setupDrawAALine(GLvoid* vertices, GLvoid* widthCoords,
1571        GLvoid* lengthCoords, float boundaryWidthProportion, int& widthSlot, int& lengthSlot) {
1572    bool force = mCaches.unbindMeshBuffer();
1573    mCaches.bindPositionVertexPointer(force, vertices, gAAVertexStride);
1574    mCaches.resetTexCoordsVertexPointer();
1575    mCaches.unbindIndicesBuffer();
1576
1577    widthSlot = mCaches.currentProgram->getAttrib("vtxWidth");
1578    glEnableVertexAttribArray(widthSlot);
1579    glVertexAttribPointer(widthSlot, 1, GL_FLOAT, GL_FALSE, gAAVertexStride, widthCoords);
1580
1581    lengthSlot = mCaches.currentProgram->getAttrib("vtxLength");
1582    glEnableVertexAttribArray(lengthSlot);
1583    glVertexAttribPointer(lengthSlot, 1, GL_FLOAT, GL_FALSE, gAAVertexStride, lengthCoords);
1584
1585    int boundaryWidthSlot = mCaches.currentProgram->getUniform("boundaryWidth");
1586    glUniform1f(boundaryWidthSlot, boundaryWidthProportion);
1587}
1588
1589void OpenGLRenderer::finishDrawAALine(const int widthSlot, const int lengthSlot) {
1590    glDisableVertexAttribArray(widthSlot);
1591    glDisableVertexAttribArray(lengthSlot);
1592}
1593
1594void OpenGLRenderer::finishDrawTexture() {
1595}
1596
1597///////////////////////////////////////////////////////////////////////////////
1598// Drawing
1599///////////////////////////////////////////////////////////////////////////////
1600
1601status_t OpenGLRenderer::drawDisplayList(DisplayList* displayList,
1602        Rect& dirty, int32_t flags, uint32_t level) {
1603
1604    // All the usual checks and setup operations (quickReject, setupDraw, etc.)
1605    // will be performed by the display list itself
1606    if (displayList && displayList->isRenderable()) {
1607        return displayList->replay(*this, dirty, flags, level);
1608    }
1609
1610    return DrawGlInfo::kStatusDone;
1611}
1612
1613void OpenGLRenderer::outputDisplayList(DisplayList* displayList, uint32_t level) {
1614    if (displayList) {
1615        displayList->output(*this, level);
1616    }
1617}
1618
1619void OpenGLRenderer::drawAlphaBitmap(Texture* texture, float left, float top, SkPaint* paint) {
1620    int alpha;
1621    SkXfermode::Mode mode;
1622    getAlphaAndMode(paint, &alpha, &mode);
1623
1624    float x = left;
1625    float y = top;
1626
1627    GLenum filter = GL_LINEAR;
1628    bool ignoreTransform = false;
1629    if (mSnapshot->transform->isPureTranslate()) {
1630        x = (int) floorf(left + mSnapshot->transform->getTranslateX() + 0.5f);
1631        y = (int) floorf(top + mSnapshot->transform->getTranslateY() + 0.5f);
1632        ignoreTransform = true;
1633        filter = GL_NEAREST;
1634    } else {
1635        filter = FILTER(paint);
1636    }
1637
1638    setupDraw();
1639    setupDrawWithTexture(true);
1640    if (paint) {
1641        setupDrawAlpha8Color(paint->getColor(), alpha);
1642    }
1643    setupDrawColorFilter();
1644    setupDrawShader();
1645    setupDrawBlending(true, mode);
1646    setupDrawProgram();
1647    setupDrawModelView(x, y, x + texture->width, y + texture->height, ignoreTransform);
1648
1649    setupDrawTexture(texture->id);
1650    texture->setWrap(GL_CLAMP_TO_EDGE);
1651    texture->setFilter(filter);
1652
1653    setupDrawPureColorUniforms();
1654    setupDrawColorFilterUniforms();
1655    setupDrawShaderUniforms();
1656    setupDrawMesh(NULL, (GLvoid*) gMeshTextureOffset);
1657
1658    glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
1659
1660    finishDrawTexture();
1661}
1662
1663status_t OpenGLRenderer::drawBitmap(SkBitmap* bitmap, float left, float top, SkPaint* paint) {
1664    const float right = left + bitmap->width();
1665    const float bottom = top + bitmap->height();
1666
1667    if (quickReject(left, top, right, bottom)) {
1668        return DrawGlInfo::kStatusDone;
1669    }
1670
1671    mCaches.activeTexture(0);
1672    Texture* texture = mCaches.textureCache.get(bitmap);
1673    if (!texture) return DrawGlInfo::kStatusDone;
1674    const AutoTexture autoCleanup(texture);
1675
1676    if (CC_UNLIKELY(bitmap->getConfig() == SkBitmap::kA8_Config)) {
1677        drawAlphaBitmap(texture, left, top, paint);
1678    } else {
1679        drawTextureRect(left, top, right, bottom, texture, paint);
1680    }
1681
1682    return DrawGlInfo::kStatusDrew;
1683}
1684
1685status_t OpenGLRenderer::drawBitmap(SkBitmap* bitmap, SkMatrix* matrix, SkPaint* paint) {
1686    Rect r(0.0f, 0.0f, bitmap->width(), bitmap->height());
1687    const mat4 transform(*matrix);
1688    transform.mapRect(r);
1689
1690    if (quickReject(r.left, r.top, r.right, r.bottom)) {
1691        return DrawGlInfo::kStatusDone;
1692    }
1693
1694    mCaches.activeTexture(0);
1695    Texture* texture = mCaches.textureCache.get(bitmap);
1696    if (!texture) return DrawGlInfo::kStatusDone;
1697    const AutoTexture autoCleanup(texture);
1698
1699    // This could be done in a cheaper way, all we need is pass the matrix
1700    // to the vertex shader. The save/restore is a bit overkill.
1701    save(SkCanvas::kMatrix_SaveFlag);
1702    concatMatrix(matrix);
1703    drawTextureRect(0.0f, 0.0f, bitmap->width(), bitmap->height(), texture, paint);
1704    restore();
1705
1706    return DrawGlInfo::kStatusDrew;
1707}
1708
1709status_t OpenGLRenderer::drawBitmapData(SkBitmap* bitmap, float left, float top, SkPaint* paint) {
1710    const float right = left + bitmap->width();
1711    const float bottom = top + bitmap->height();
1712
1713    if (quickReject(left, top, right, bottom)) {
1714        return DrawGlInfo::kStatusDone;
1715    }
1716
1717    mCaches.activeTexture(0);
1718    Texture* texture = mCaches.textureCache.getTransient(bitmap);
1719    const AutoTexture autoCleanup(texture);
1720
1721    drawTextureRect(left, top, right, bottom, texture, paint);
1722
1723    return DrawGlInfo::kStatusDrew;
1724}
1725
1726status_t OpenGLRenderer::drawBitmapMesh(SkBitmap* bitmap, int meshWidth, int meshHeight,
1727        float* vertices, int* colors, SkPaint* paint) {
1728    if (!vertices || mSnapshot->isIgnored()) {
1729        return DrawGlInfo::kStatusDone;
1730    }
1731
1732    // TODO: We should compute the bounding box when recording the display list
1733    float left = FLT_MAX;
1734    float top = FLT_MAX;
1735    float right = FLT_MIN;
1736    float bottom = FLT_MIN;
1737
1738    const uint32_t count = meshWidth * meshHeight * 6;
1739
1740    // TODO: Support the colors array
1741    TextureVertex mesh[count];
1742    TextureVertex* vertex = mesh;
1743
1744    for (int32_t y = 0; y < meshHeight; y++) {
1745        for (int32_t x = 0; x < meshWidth; x++) {
1746            uint32_t i = (y * (meshWidth + 1) + x) * 2;
1747
1748            float u1 = float(x) / meshWidth;
1749            float u2 = float(x + 1) / meshWidth;
1750            float v1 = float(y) / meshHeight;
1751            float v2 = float(y + 1) / meshHeight;
1752
1753            int ax = i + (meshWidth + 1) * 2;
1754            int ay = ax + 1;
1755            int bx = i;
1756            int by = bx + 1;
1757            int cx = i + 2;
1758            int cy = cx + 1;
1759            int dx = i + (meshWidth + 1) * 2 + 2;
1760            int dy = dx + 1;
1761
1762            TextureVertex::set(vertex++, vertices[ax], vertices[ay], u1, v2);
1763            TextureVertex::set(vertex++, vertices[bx], vertices[by], u1, v1);
1764            TextureVertex::set(vertex++, vertices[cx], vertices[cy], u2, v1);
1765
1766            TextureVertex::set(vertex++, vertices[ax], vertices[ay], u1, v2);
1767            TextureVertex::set(vertex++, vertices[cx], vertices[cy], u2, v1);
1768            TextureVertex::set(vertex++, vertices[dx], vertices[dy], u2, v2);
1769
1770            // TODO: This could be optimized to avoid unnecessary ops
1771            left = fminf(left, fminf(vertices[ax], fminf(vertices[bx], vertices[cx])));
1772            top = fminf(top, fminf(vertices[ay], fminf(vertices[by], vertices[cy])));
1773            right = fmaxf(right, fmaxf(vertices[ax], fmaxf(vertices[bx], vertices[cx])));
1774            bottom = fmaxf(bottom, fmaxf(vertices[ay], fmaxf(vertices[by], vertices[cy])));
1775        }
1776    }
1777
1778    if (quickReject(left, top, right, bottom)) {
1779        return DrawGlInfo::kStatusDone;
1780    }
1781
1782    mCaches.activeTexture(0);
1783    Texture* texture = mCaches.textureCache.get(bitmap);
1784    if (!texture) return DrawGlInfo::kStatusDone;
1785    const AutoTexture autoCleanup(texture);
1786
1787    texture->setWrap(GL_CLAMP_TO_EDGE, true);
1788    texture->setFilter(FILTER(paint), true);
1789
1790    int alpha;
1791    SkXfermode::Mode mode;
1792    getAlphaAndMode(paint, &alpha, &mode);
1793
1794    if (hasLayer()) {
1795        dirtyLayer(left, top, right, bottom, *mSnapshot->transform);
1796    }
1797
1798    drawTextureMesh(0.0f, 0.0f, 1.0f, 1.0f, texture->id, alpha / 255.0f,
1799            mode, texture->blend, &mesh[0].position[0], &mesh[0].texture[0],
1800            GL_TRIANGLES, count, false, false, 0, false, false);
1801
1802    return DrawGlInfo::kStatusDrew;
1803}
1804
1805status_t OpenGLRenderer::drawBitmap(SkBitmap* bitmap,
1806         float srcLeft, float srcTop, float srcRight, float srcBottom,
1807         float dstLeft, float dstTop, float dstRight, float dstBottom,
1808         SkPaint* paint) {
1809    if (quickReject(dstLeft, dstTop, dstRight, dstBottom)) {
1810        return DrawGlInfo::kStatusDone;
1811    }
1812
1813    mCaches.activeTexture(0);
1814    Texture* texture = mCaches.textureCache.get(bitmap);
1815    if (!texture) return DrawGlInfo::kStatusDone;
1816    const AutoTexture autoCleanup(texture);
1817
1818    const float width = texture->width;
1819    const float height = texture->height;
1820
1821    const float u1 = fmax(0.0f, srcLeft / width);
1822    const float v1 = fmax(0.0f, srcTop / height);
1823    const float u2 = fmin(1.0f, srcRight / width);
1824    const float v2 = fmin(1.0f, srcBottom / height);
1825
1826    mCaches.unbindMeshBuffer();
1827    resetDrawTextureTexCoords(u1, v1, u2, v2);
1828
1829    int alpha;
1830    SkXfermode::Mode mode;
1831    getAlphaAndMode(paint, &alpha, &mode);
1832
1833    texture->setWrap(GL_CLAMP_TO_EDGE, true);
1834
1835    if (CC_LIKELY(mSnapshot->transform->isPureTranslate())) {
1836        const float x = (int) floorf(dstLeft + mSnapshot->transform->getTranslateX() + 0.5f);
1837        const float y = (int) floorf(dstTop + mSnapshot->transform->getTranslateY() + 0.5f);
1838
1839        GLenum filter = GL_NEAREST;
1840        // Enable linear filtering if the source rectangle is scaled
1841        if (srcRight - srcLeft != dstRight - dstLeft || srcBottom - srcTop != dstBottom - dstTop) {
1842            filter = FILTER(paint);
1843        }
1844
1845        texture->setFilter(filter, true);
1846        drawTextureMesh(x, y, x + (dstRight - dstLeft), y + (dstBottom - dstTop),
1847                texture->id, alpha / 255.0f, mode, texture->blend,
1848                &mMeshVertices[0].position[0], &mMeshVertices[0].texture[0],
1849                GL_TRIANGLE_STRIP, gMeshCount, false, true);
1850    } else {
1851        texture->setFilter(FILTER(paint), true);
1852        drawTextureMesh(dstLeft, dstTop, dstRight, dstBottom, texture->id, alpha / 255.0f,
1853                mode, texture->blend, &mMeshVertices[0].position[0], &mMeshVertices[0].texture[0],
1854                GL_TRIANGLE_STRIP, gMeshCount);
1855    }
1856
1857    resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f);
1858
1859    return DrawGlInfo::kStatusDrew;
1860}
1861
1862status_t OpenGLRenderer::drawPatch(SkBitmap* bitmap, const int32_t* xDivs, const int32_t* yDivs,
1863        const uint32_t* colors, uint32_t width, uint32_t height, int8_t numColors,
1864        float left, float top, float right, float bottom, SkPaint* paint) {
1865    int alpha;
1866    SkXfermode::Mode mode;
1867    getAlphaAndModeDirect(paint, &alpha, &mode);
1868
1869    return drawPatch(bitmap, xDivs, yDivs, colors, width, height, numColors,
1870            left, top, right, bottom, alpha, mode);
1871}
1872
1873status_t OpenGLRenderer::drawPatch(SkBitmap* bitmap, const int32_t* xDivs, const int32_t* yDivs,
1874        const uint32_t* colors, uint32_t width, uint32_t height, int8_t numColors,
1875        float left, float top, float right, float bottom, int alpha, SkXfermode::Mode mode) {
1876    if (quickReject(left, top, right, bottom)) {
1877        return DrawGlInfo::kStatusDone;
1878    }
1879
1880    alpha *= mSnapshot->alpha;
1881
1882    mCaches.activeTexture(0);
1883    Texture* texture = mCaches.textureCache.get(bitmap);
1884    if (!texture) return DrawGlInfo::kStatusDone;
1885    const AutoTexture autoCleanup(texture);
1886    texture->setWrap(GL_CLAMP_TO_EDGE, true);
1887    texture->setFilter(GL_LINEAR, true);
1888
1889    const Patch* mesh = mCaches.patchCache.get(bitmap->width(), bitmap->height(),
1890            right - left, bottom - top, xDivs, yDivs, colors, width, height, numColors);
1891
1892    if (CC_LIKELY(mesh && mesh->verticesCount > 0)) {
1893        const bool pureTranslate = mSnapshot->transform->isPureTranslate();
1894        // Mark the current layer dirty where we are going to draw the patch
1895        if (hasLayer() && mesh->hasEmptyQuads) {
1896            const float offsetX = left + mSnapshot->transform->getTranslateX();
1897            const float offsetY = top + mSnapshot->transform->getTranslateY();
1898            const size_t count = mesh->quads.size();
1899            for (size_t i = 0; i < count; i++) {
1900                const Rect& bounds = mesh->quads.itemAt(i);
1901                if (CC_LIKELY(pureTranslate)) {
1902                    const float x = (int) floorf(bounds.left + offsetX + 0.5f);
1903                    const float y = (int) floorf(bounds.top + offsetY + 0.5f);
1904                    dirtyLayer(x, y, x + bounds.getWidth(), y + bounds.getHeight());
1905                } else {
1906                    dirtyLayer(left + bounds.left, top + bounds.top,
1907                            left + bounds.right, top + bounds.bottom, *mSnapshot->transform);
1908                }
1909            }
1910        }
1911
1912        if (CC_LIKELY(pureTranslate)) {
1913            const float x = (int) floorf(left + mSnapshot->transform->getTranslateX() + 0.5f);
1914            const float y = (int) floorf(top + mSnapshot->transform->getTranslateY() + 0.5f);
1915
1916            drawTextureMesh(x, y, x + right - left, y + bottom - top, texture->id, alpha / 255.0f,
1917                    mode, texture->blend, (GLvoid*) 0, (GLvoid*) gMeshTextureOffset,
1918                    GL_TRIANGLES, mesh->verticesCount, false, true, mesh->meshBuffer,
1919                    true, !mesh->hasEmptyQuads);
1920        } else {
1921            drawTextureMesh(left, top, right, bottom, texture->id, alpha / 255.0f,
1922                    mode, texture->blend, (GLvoid*) 0, (GLvoid*) gMeshTextureOffset,
1923                    GL_TRIANGLES, mesh->verticesCount, false, false, mesh->meshBuffer,
1924                    true, !mesh->hasEmptyQuads);
1925        }
1926    }
1927
1928    return DrawGlInfo::kStatusDrew;
1929}
1930
1931/**
1932 * Renders a convex path via tessellation. For AA paths, this function uses a similar approach to
1933 * that of AA lines in the drawLines() function.  We expand the convex path by a half pixel in
1934 * screen space in all directions. However, instead of using a fragment shader to compute the
1935 * translucency of the color from its position, we simply use a varying parameter to define how far
1936 * a given pixel is from the edge. For non-AA paths, the expansion and alpha varying are not used.
1937 *
1938 * Doesn't yet support joins, caps, or path effects.
1939 */
1940void OpenGLRenderer::drawConvexPath(const SkPath& path, SkPaint* paint) {
1941    int color = paint->getColor();
1942    SkPaint::Style style = paint->getStyle();
1943    SkXfermode::Mode mode = getXfermode(paint->getXfermode());
1944    bool isAA = paint->isAntiAlias();
1945
1946    VertexBuffer vertexBuffer;
1947    // TODO: try clipping large paths to viewport
1948    PathRenderer::convexPathVertices(path, paint, mSnapshot->transform, vertexBuffer);
1949
1950    if (!vertexBuffer.getSize()) {
1951        // no vertices to draw
1952        return;
1953    }
1954
1955    setupDraw();
1956    setupDrawNoTexture();
1957    if (isAA) setupDrawAA();
1958    setupDrawVertexShape();
1959    setupDrawColor(color, ((color >> 24) & 0xFF) * mSnapshot->alpha);
1960    setupDrawColorFilter();
1961    setupDrawShader();
1962    setupDrawBlending(isAA, mode);
1963    setupDrawProgram();
1964    setupDrawModelViewIdentity();
1965    setupDrawColorUniforms();
1966    setupDrawColorFilterUniforms();
1967    setupDrawShaderIdentityUniforms();
1968
1969    void* vertices = vertexBuffer.getBuffer();
1970    bool force = mCaches.unbindMeshBuffer();
1971    mCaches.bindPositionVertexPointer(true, vertices, isAA ? gAlphaVertexStride : gVertexStride);
1972    mCaches.resetTexCoordsVertexPointer();
1973    mCaches.unbindIndicesBuffer();
1974
1975    int alphaSlot = -1;
1976    if (isAA) {
1977        void* alphaCoords = ((GLbyte*) vertices) + gVertexAlphaOffset;
1978        alphaSlot = mCaches.currentProgram->getAttrib("vtxAlpha");
1979
1980        // TODO: avoid enable/disable in back to back uses of the alpha attribute
1981        glEnableVertexAttribArray(alphaSlot);
1982        glVertexAttribPointer(alphaSlot, 1, GL_FLOAT, GL_FALSE, gAlphaVertexStride, alphaCoords);
1983    }
1984
1985    SkRect bounds = PathRenderer::computePathBounds(path, paint);
1986    dirtyLayer(bounds.fLeft, bounds.fTop, bounds.fRight, bounds.fBottom, *mSnapshot->transform);
1987
1988    glDrawArrays(GL_TRIANGLE_STRIP, 0, vertexBuffer.getSize());
1989
1990    if (isAA) {
1991        glDisableVertexAttribArray(alphaSlot);
1992    }
1993}
1994
1995/**
1996 * We draw lines as quads (tristrips). Using GL_LINES can be difficult because the rasterization
1997 * rules for those lines produces some unexpected results, and may vary between hardware devices.
1998 * The basics of lines-as-quads is easy; we simply find the normal to the line and position the
1999 * corners of the quads on either side of each line endpoint, separated by the strokeWidth
2000 * of the line. Hairlines are more involved because we need to account for transform scaling
2001 * to end up with a one-pixel-wide line in screen space..
2002 * Anti-aliased lines add another factor to the approach. We use a specialized fragment shader
2003 * in combination with values that we calculate and pass down in this method. The basic approach
2004 * is that the quad we create contains both the core line area plus a bounding area in which
2005 * the translucent/AA pixels are drawn. The values we calculate tell the shader what
2006 * proportion of the width and the length of a given segment is represented by the boundary
2007 * region. The quad ends up being exactly .5 pixel larger in all directions than the non-AA quad.
2008 * The bounding region is actually 1 pixel wide on all sides (half pixel on the outside, half pixel
2009 * on the inside). This ends up giving the result we want, with pixels that are completely
2010 * 'inside' the line area being filled opaquely and the other pixels being filled according to
2011 * how far into the boundary region they are, which is determined by shader interpolation.
2012 */
2013status_t OpenGLRenderer::drawLines(float* points, int count, SkPaint* paint) {
2014    if (mSnapshot->isIgnored()) return DrawGlInfo::kStatusDone;
2015
2016    const bool isAA = paint->isAntiAlias();
2017    // We use half the stroke width here because we're going to position the quad
2018    // corner vertices half of the width away from the line endpoints
2019    float halfStrokeWidth = paint->getStrokeWidth() * 0.5f;
2020    // A stroke width of 0 has a special meaning in Skia:
2021    // it draws a line 1 px wide regardless of current transform
2022    bool isHairLine = paint->getStrokeWidth() == 0.0f;
2023
2024    float inverseScaleX = 1.0f;
2025    float inverseScaleY = 1.0f;
2026    bool scaled = false;
2027
2028    int alpha;
2029    SkXfermode::Mode mode;
2030
2031    int generatedVerticesCount = 0;
2032    int verticesCount = count;
2033    if (count > 4) {
2034        // Polyline: account for extra vertices needed for continuous tri-strip
2035        verticesCount += (count - 4);
2036    }
2037
2038    if (isHairLine || isAA) {
2039        // The quad that we use for AA and hairlines needs to account for scaling. For hairlines
2040        // the line on the screen should always be one pixel wide regardless of scale. For
2041        // AA lines, we only want one pixel of translucent boundary around the quad.
2042        if (CC_UNLIKELY(!mSnapshot->transform->isPureTranslate())) {
2043            Matrix4 *mat = mSnapshot->transform;
2044            float m00 = mat->data[Matrix4::kScaleX];
2045            float m01 = mat->data[Matrix4::kSkewY];
2046            float m10 = mat->data[Matrix4::kSkewX];
2047            float m11 = mat->data[Matrix4::kScaleY];
2048
2049            float scaleX = sqrtf(m00 * m00 + m01 * m01);
2050            float scaleY = sqrtf(m10 * m10 + m11 * m11);
2051
2052            inverseScaleX = (scaleX != 0) ? (inverseScaleX / scaleX) : 0;
2053            inverseScaleY = (scaleY != 0) ? (inverseScaleY / scaleY) : 0;
2054
2055            if (inverseScaleX != 1.0f || inverseScaleY != 1.0f) {
2056                scaled = true;
2057            }
2058        }
2059    }
2060
2061    getAlphaAndMode(paint, &alpha, &mode);
2062
2063    mCaches.enableScissor();
2064
2065    setupDraw();
2066    setupDrawNoTexture();
2067    if (isAA) {
2068        setupDrawAA();
2069    }
2070    setupDrawColor(paint->getColor(), alpha);
2071    setupDrawColorFilter();
2072    setupDrawShader();
2073    setupDrawBlending(isAA, mode);
2074    setupDrawProgram();
2075    setupDrawModelViewIdentity(true);
2076    setupDrawColorUniforms();
2077    setupDrawColorFilterUniforms();
2078    setupDrawShaderIdentityUniforms();
2079
2080    if (isHairLine) {
2081        // Set a real stroke width to be used in quad construction
2082        halfStrokeWidth = isAA? 1 : .5;
2083    } else if (isAA && !scaled) {
2084        // Expand boundary to enable AA calculations on the quad border
2085        halfStrokeWidth += .5f;
2086    }
2087
2088    int widthSlot;
2089    int lengthSlot;
2090
2091    Vertex lines[verticesCount];
2092    Vertex* vertices = &lines[0];
2093
2094    AAVertex wLines[verticesCount];
2095    AAVertex* aaVertices = &wLines[0];
2096
2097    if (CC_UNLIKELY(!isAA)) {
2098        setupDrawVertices(vertices);
2099    } else {
2100        void* widthCoords = ((GLbyte*) aaVertices) + gVertexAAWidthOffset;
2101        void* lengthCoords = ((GLbyte*) aaVertices) + gVertexAALengthOffset;
2102        // innerProportion is the ratio of the inner (non-AA) part of the line to the total
2103        // AA stroke width (the base stroke width expanded by a half pixel on either side).
2104        // This value is used in the fragment shader to determine how to fill fragments.
2105        // We will need to calculate the actual width proportion on each segment for
2106        // scaled non-hairlines, since the boundary proportion may differ per-axis when scaled.
2107        float boundaryWidthProportion = .5 - 1 / (2 * halfStrokeWidth);
2108        setupDrawAALine((void*) aaVertices, widthCoords, lengthCoords,
2109                boundaryWidthProportion, widthSlot, lengthSlot);
2110    }
2111
2112    AAVertex* prevAAVertex = NULL;
2113    Vertex* prevVertex = NULL;
2114
2115    int boundaryLengthSlot = -1;
2116    int boundaryWidthSlot = -1;
2117
2118    for (int i = 0; i < count; i += 4) {
2119        // a = start point, b = end point
2120        vec2 a(points[i], points[i + 1]);
2121        vec2 b(points[i + 2], points[i + 3]);
2122
2123        float length = 0;
2124        float boundaryLengthProportion = 0;
2125        float boundaryWidthProportion = 0;
2126
2127        // Find the normal to the line
2128        vec2 n = (b - a).copyNormalized() * halfStrokeWidth;
2129        float x = n.x;
2130        n.x = -n.y;
2131        n.y = x;
2132
2133        if (isHairLine) {
2134            if (isAA) {
2135                float wideningFactor;
2136                if (fabs(n.x) >= fabs(n.y)) {
2137                    wideningFactor = fabs(1.0f / n.x);
2138                } else {
2139                    wideningFactor = fabs(1.0f / n.y);
2140                }
2141                n *= wideningFactor;
2142            }
2143
2144            if (scaled) {
2145                n.x *= inverseScaleX;
2146                n.y *= inverseScaleY;
2147            }
2148        } else if (scaled) {
2149            // Extend n by .5 pixel on each side, post-transform
2150            vec2 extendedN = n.copyNormalized();
2151            extendedN /= 2;
2152            extendedN.x *= inverseScaleX;
2153            extendedN.y *= inverseScaleY;
2154
2155            float extendedNLength = extendedN.length();
2156            // We need to set this value on the shader prior to drawing
2157            boundaryWidthProportion = .5 - extendedNLength / (halfStrokeWidth + extendedNLength);
2158            n += extendedN;
2159        }
2160
2161        // aa lines expand the endpoint vertices to encompass the AA boundary
2162        if (isAA) {
2163            vec2 abVector = (b - a);
2164            length = abVector.length();
2165            abVector.normalize();
2166
2167            if (scaled) {
2168                abVector.x *= inverseScaleX;
2169                abVector.y *= inverseScaleY;
2170                float abLength = abVector.length();
2171                boundaryLengthProportion = .5 - abLength / (length + abLength);
2172            } else {
2173                boundaryLengthProportion = .5 - .5 / (length + 1);
2174            }
2175
2176            abVector /= 2;
2177            a -= abVector;
2178            b += abVector;
2179        }
2180
2181        // Four corners of the rectangle defining a thick line
2182        vec2 p1 = a - n;
2183        vec2 p2 = a + n;
2184        vec2 p3 = b + n;
2185        vec2 p4 = b - n;
2186
2187
2188        const float left = fmin(p1.x, fmin(p2.x, fmin(p3.x, p4.x)));
2189        const float right = fmax(p1.x, fmax(p2.x, fmax(p3.x, p4.x)));
2190        const float top = fmin(p1.y, fmin(p2.y, fmin(p3.y, p4.y)));
2191        const float bottom = fmax(p1.y, fmax(p2.y, fmax(p3.y, p4.y)));
2192
2193        if (!quickRejectNoScissor(left, top, right, bottom)) {
2194            if (!isAA) {
2195                if (prevVertex != NULL) {
2196                    // Issue two repeat vertices to create degenerate triangles to bridge
2197                    // between the previous line and the new one. This is necessary because
2198                    // we are creating a single triangle_strip which will contain
2199                    // potentially discontinuous line segments.
2200                    Vertex::set(vertices++, prevVertex->position[0], prevVertex->position[1]);
2201                    Vertex::set(vertices++, p1.x, p1.y);
2202                    generatedVerticesCount += 2;
2203                }
2204
2205                Vertex::set(vertices++, p1.x, p1.y);
2206                Vertex::set(vertices++, p2.x, p2.y);
2207                Vertex::set(vertices++, p4.x, p4.y);
2208                Vertex::set(vertices++, p3.x, p3.y);
2209
2210                prevVertex = vertices - 1;
2211                generatedVerticesCount += 4;
2212            } else {
2213                if (!isHairLine && scaled) {
2214                    // Must set width proportions per-segment for scaled non-hairlines to use the
2215                    // correct AA boundary dimensions
2216                    if (boundaryWidthSlot < 0) {
2217                        boundaryWidthSlot =
2218                                mCaches.currentProgram->getUniform("boundaryWidth");
2219                    }
2220
2221                    glUniform1f(boundaryWidthSlot, boundaryWidthProportion);
2222                }
2223
2224                if (boundaryLengthSlot < 0) {
2225                    boundaryLengthSlot = mCaches.currentProgram->getUniform("boundaryLength");
2226                }
2227
2228                glUniform1f(boundaryLengthSlot, boundaryLengthProportion);
2229
2230                if (prevAAVertex != NULL) {
2231                    // Issue two repeat vertices to create degenerate triangles to bridge
2232                    // between the previous line and the new one. This is necessary because
2233                    // we are creating a single triangle_strip which will contain
2234                    // potentially discontinuous line segments.
2235                    AAVertex::set(aaVertices++,prevAAVertex->position[0],
2236                            prevAAVertex->position[1], prevAAVertex->width, prevAAVertex->length);
2237                    AAVertex::set(aaVertices++, p4.x, p4.y, 1, 1);
2238                    generatedVerticesCount += 2;
2239                }
2240
2241                AAVertex::set(aaVertices++, p4.x, p4.y, 1, 1);
2242                AAVertex::set(aaVertices++, p1.x, p1.y, 1, 0);
2243                AAVertex::set(aaVertices++, p3.x, p3.y, 0, 1);
2244                AAVertex::set(aaVertices++, p2.x, p2.y, 0, 0);
2245
2246                prevAAVertex = aaVertices - 1;
2247                generatedVerticesCount += 4;
2248            }
2249
2250            dirtyLayer(a.x == b.x ? left - 1 : left, a.y == b.y ? top - 1 : top,
2251                    a.x == b.x ? right: right, a.y == b.y ? bottom: bottom,
2252                    *mSnapshot->transform);
2253        }
2254    }
2255
2256    if (generatedVerticesCount > 0) {
2257       glDrawArrays(GL_TRIANGLE_STRIP, 0, generatedVerticesCount);
2258    }
2259
2260    if (isAA) {
2261        finishDrawAALine(widthSlot, lengthSlot);
2262    }
2263
2264    return DrawGlInfo::kStatusDrew;
2265}
2266
2267status_t OpenGLRenderer::drawPoints(float* points, int count, SkPaint* paint) {
2268    if (mSnapshot->isIgnored()) return DrawGlInfo::kStatusDone;
2269
2270    // TODO: The paint's cap style defines whether the points are square or circular
2271    // TODO: Handle AA for round points
2272
2273    // A stroke width of 0 has a special meaning in Skia:
2274    // it draws an unscaled 1px point
2275    float strokeWidth = paint->getStrokeWidth();
2276    const bool isHairLine = paint->getStrokeWidth() == 0.0f;
2277    if (isHairLine) {
2278        // Now that we know it's hairline, we can set the effective width, to be used later
2279        strokeWidth = 1.0f;
2280    }
2281    const float halfWidth = strokeWidth / 2;
2282    int alpha;
2283    SkXfermode::Mode mode;
2284    getAlphaAndMode(paint, &alpha, &mode);
2285
2286    int verticesCount = count >> 1;
2287    int generatedVerticesCount = 0;
2288
2289    TextureVertex pointsData[verticesCount];
2290    TextureVertex* vertex = &pointsData[0];
2291
2292    // TODO: We should optimize this method to not generate vertices for points
2293    // that lie outside of the clip.
2294    mCaches.enableScissor();
2295
2296    setupDraw();
2297    setupDrawNoTexture();
2298    setupDrawPoint(strokeWidth);
2299    setupDrawColor(paint->getColor(), alpha);
2300    setupDrawColorFilter();
2301    setupDrawShader();
2302    setupDrawBlending(mode);
2303    setupDrawProgram();
2304    setupDrawModelViewIdentity(true);
2305    setupDrawColorUniforms();
2306    setupDrawColorFilterUniforms();
2307    setupDrawPointUniforms();
2308    setupDrawShaderIdentityUniforms();
2309    setupDrawMesh(vertex);
2310
2311    for (int i = 0; i < count; i += 2) {
2312        TextureVertex::set(vertex++, points[i], points[i + 1], 0.0f, 0.0f);
2313        generatedVerticesCount++;
2314
2315        float left = points[i] - halfWidth;
2316        float right = points[i] + halfWidth;
2317        float top = points[i + 1] - halfWidth;
2318        float bottom = points [i + 1] + halfWidth;
2319
2320        dirtyLayer(left, top, right, bottom, *mSnapshot->transform);
2321    }
2322
2323    glDrawArrays(GL_POINTS, 0, generatedVerticesCount);
2324
2325    return DrawGlInfo::kStatusDrew;
2326}
2327
2328status_t OpenGLRenderer::drawColor(int color, SkXfermode::Mode mode) {
2329    // No need to check against the clip, we fill the clip region
2330    if (mSnapshot->isIgnored()) return DrawGlInfo::kStatusDone;
2331
2332    Rect& clip(*mSnapshot->clipRect);
2333    clip.snapToPixelBoundaries();
2334
2335    drawColorRect(clip.left, clip.top, clip.right, clip.bottom, color, mode, true);
2336
2337    return DrawGlInfo::kStatusDrew;
2338}
2339
2340status_t OpenGLRenderer::drawShape(float left, float top, const PathTexture* texture,
2341        SkPaint* paint) {
2342    if (!texture) return DrawGlInfo::kStatusDone;
2343    const AutoTexture autoCleanup(texture);
2344
2345    const float x = left + texture->left - texture->offset;
2346    const float y = top + texture->top - texture->offset;
2347
2348    drawPathTexture(texture, x, y, paint);
2349
2350    return DrawGlInfo::kStatusDrew;
2351}
2352
2353status_t OpenGLRenderer::drawRoundRect(float left, float top, float right, float bottom,
2354        float rx, float ry, SkPaint* p) {
2355    if (mSnapshot->isIgnored() || quickRejectPreStroke(left, top, right, bottom, p)) {
2356        return DrawGlInfo::kStatusDone;
2357    }
2358
2359    if (p->getPathEffect() != 0) {
2360        mCaches.activeTexture(0);
2361        const PathTexture* texture = mCaches.roundRectShapeCache.getRoundRect(
2362                right - left, bottom - top, rx, ry, p);
2363        return drawShape(left, top, texture, p);
2364    }
2365
2366    SkPath path;
2367    SkRect rect = SkRect::MakeLTRB(left, top, right, bottom);
2368    if (p->getStyle() == SkPaint::kStrokeAndFill_Style) {
2369        float outset = p->getStrokeWidth() / 2;
2370        rect.outset(outset, outset);
2371        rx += outset;
2372        ry += outset;
2373    }
2374    path.addRoundRect(rect, rx, ry);
2375    drawConvexPath(path, p);
2376
2377    return DrawGlInfo::kStatusDrew;
2378}
2379
2380status_t OpenGLRenderer::drawCircle(float x, float y, float radius, SkPaint* p) {
2381    if (mSnapshot->isIgnored() || quickRejectPreStroke(x - radius, y - radius,
2382            x + radius, y + radius, p)) {
2383        return DrawGlInfo::kStatusDone;
2384    }
2385    if (p->getPathEffect() != 0) {
2386        mCaches.activeTexture(0);
2387        const PathTexture* texture = mCaches.circleShapeCache.getCircle(radius, p);
2388        return drawShape(x - radius, y - radius, texture, p);
2389    }
2390
2391    SkPath path;
2392    if (p->getStyle() == SkPaint::kStrokeAndFill_Style) {
2393        path.addCircle(x, y, radius + p->getStrokeWidth() / 2);
2394    } else {
2395        path.addCircle(x, y, radius);
2396    }
2397    drawConvexPath(path, p);
2398
2399    return DrawGlInfo::kStatusDrew;
2400}
2401
2402status_t OpenGLRenderer::drawOval(float left, float top, float right, float bottom,
2403        SkPaint* p) {
2404    if (mSnapshot->isIgnored() || quickRejectPreStroke(left, top, right, bottom, p)) {
2405        return DrawGlInfo::kStatusDone;
2406    }
2407
2408    if (p->getPathEffect() != 0) {
2409        mCaches.activeTexture(0);
2410        const PathTexture* texture = mCaches.ovalShapeCache.getOval(right - left, bottom - top, p);
2411        return drawShape(left, top, texture, p);
2412    }
2413
2414    SkPath path;
2415    SkRect rect = SkRect::MakeLTRB(left, top, right, bottom);
2416    if (p->getStyle() == SkPaint::kStrokeAndFill_Style) {
2417        rect.outset(p->getStrokeWidth() / 2, p->getStrokeWidth() / 2);
2418    }
2419    path.addOval(rect);
2420    drawConvexPath(path, p);
2421
2422    return DrawGlInfo::kStatusDrew;
2423}
2424
2425status_t OpenGLRenderer::drawArc(float left, float top, float right, float bottom,
2426        float startAngle, float sweepAngle, bool useCenter, SkPaint* p) {
2427    if (mSnapshot->isIgnored() || quickRejectPreStroke(left, top, right, bottom, p)) {
2428        return DrawGlInfo::kStatusDone;
2429    }
2430
2431    if (fabs(sweepAngle) >= 360.0f) {
2432        return drawOval(left, top, right, bottom, p);
2433    }
2434
2435    // TODO: support fills (accounting for concavity if useCenter && sweepAngle > 180)
2436    if (p->getStyle() != SkPaint::kStroke_Style || p->getPathEffect() != 0 || p->getStrokeCap() != SkPaint::kButt_Cap) {
2437        mCaches.activeTexture(0);
2438        const PathTexture* texture = mCaches.arcShapeCache.getArc(right - left, bottom - top,
2439                startAngle, sweepAngle, useCenter, p);
2440        return drawShape(left, top, texture, p);
2441    }
2442
2443    SkRect rect = SkRect::MakeLTRB(left, top, right, bottom);
2444    if (p->getStyle() == SkPaint::kStrokeAndFill_Style) {
2445        rect.outset(p->getStrokeWidth() / 2, p->getStrokeWidth() / 2);
2446    }
2447
2448    SkPath path;
2449    if (useCenter) {
2450        path.moveTo(rect.centerX(), rect.centerY());
2451    }
2452    path.arcTo(rect, startAngle, sweepAngle, !useCenter);
2453    if (useCenter) {
2454        path.close();
2455    }
2456    drawConvexPath(path, p);
2457
2458    return DrawGlInfo::kStatusDrew;
2459}
2460
2461// See SkPaintDefaults.h
2462#define SkPaintDefaults_MiterLimit SkIntToScalar(4)
2463
2464status_t OpenGLRenderer::drawRect(float left, float top, float right, float bottom, SkPaint* p) {
2465    if (mSnapshot->isIgnored() || quickRejectPreStroke(left, top, right, bottom, p)) {
2466        return DrawGlInfo::kStatusDone;
2467    }
2468
2469    if (p->getStyle() != SkPaint::kFill_Style) {
2470        // only fill style is supported by drawConvexPath, since others have to handle joins
2471        if (p->getPathEffect() != 0 || p->getStrokeJoin() != SkPaint::kMiter_Join ||
2472                p->getStrokeMiter() != SkPaintDefaults_MiterLimit) {
2473            mCaches.activeTexture(0);
2474            const PathTexture* texture =
2475                    mCaches.rectShapeCache.getRect(right - left, bottom - top, p);
2476            return drawShape(left, top, texture, p);
2477        }
2478
2479        SkPath path;
2480        SkRect rect = SkRect::MakeLTRB(left, top, right, bottom);
2481        if (p->getStyle() == SkPaint::kStrokeAndFill_Style) {
2482            rect.outset(p->getStrokeWidth() / 2, p->getStrokeWidth() / 2);
2483        }
2484        path.addRect(rect);
2485        drawConvexPath(path, p);
2486
2487        return DrawGlInfo::kStatusDrew;
2488    }
2489
2490    if (p->isAntiAlias() && !mSnapshot->transform->isSimple()) {
2491        SkPath path;
2492        path.addRect(left, top, right, bottom);
2493        drawConvexPath(path, p);
2494    } else {
2495        drawColorRect(left, top, right, bottom, p->getColor(), getXfermode(p->getXfermode()));
2496    }
2497
2498    return DrawGlInfo::kStatusDrew;
2499}
2500
2501void OpenGLRenderer::drawTextShadow(SkPaint* paint, const char* text, int bytesCount, int count,
2502        const float* positions, FontRenderer& fontRenderer, int alpha, SkXfermode::Mode mode,
2503        float x, float y) {
2504    mCaches.activeTexture(0);
2505
2506    // NOTE: The drop shadow will not perform gamma correction
2507    //       if shader-based correction is enabled
2508    mCaches.dropShadowCache.setFontRenderer(fontRenderer);
2509    const ShadowTexture* shadow = mCaches.dropShadowCache.get(
2510            paint, text, bytesCount, count, mShadowRadius, positions);
2511    const AutoTexture autoCleanup(shadow);
2512
2513    const float sx = x - shadow->left + mShadowDx;
2514    const float sy = y - shadow->top + mShadowDy;
2515
2516    const int shadowAlpha = ((mShadowColor >> 24) & 0xFF) * mSnapshot->alpha;
2517    int shadowColor = mShadowColor;
2518    if (mShader) {
2519        shadowColor = 0xffffffff;
2520    }
2521
2522    setupDraw();
2523    setupDrawWithTexture(true);
2524    setupDrawAlpha8Color(shadowColor, shadowAlpha < 255 ? shadowAlpha : alpha);
2525    setupDrawColorFilter();
2526    setupDrawShader();
2527    setupDrawBlending(true, mode);
2528    setupDrawProgram();
2529    setupDrawModelView(sx, sy, sx + shadow->width, sy + shadow->height);
2530    setupDrawTexture(shadow->id);
2531    setupDrawPureColorUniforms();
2532    setupDrawColorFilterUniforms();
2533    setupDrawShaderUniforms();
2534    setupDrawMesh(NULL, (GLvoid*) gMeshTextureOffset);
2535
2536    glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
2537}
2538
2539status_t OpenGLRenderer::drawPosText(const char* text, int bytesCount, int count,
2540        const float* positions, SkPaint* paint) {
2541    if (text == NULL || count == 0 || mSnapshot->isIgnored() ||
2542            (paint->getAlpha() * mSnapshot->alpha == 0 && paint->getXfermode() == NULL)) {
2543        return DrawGlInfo::kStatusDone;
2544    }
2545
2546    // NOTE: Skia does not support perspective transform on drawPosText yet
2547    if (!mSnapshot->transform->isSimple()) {
2548        return DrawGlInfo::kStatusDone;
2549    }
2550
2551    float x = 0.0f;
2552    float y = 0.0f;
2553    const bool pureTranslate = mSnapshot->transform->isPureTranslate();
2554    if (pureTranslate) {
2555        x = (int) floorf(x + mSnapshot->transform->getTranslateX() + 0.5f);
2556        y = (int) floorf(y + mSnapshot->transform->getTranslateY() + 0.5f);
2557    }
2558
2559    FontRenderer& fontRenderer = mCaches.fontRenderer->getFontRenderer(paint);
2560    fontRenderer.setFont(paint, SkTypeface::UniqueID(paint->getTypeface()),
2561            paint->getTextSize());
2562
2563    int alpha;
2564    SkXfermode::Mode mode;
2565    getAlphaAndMode(paint, &alpha, &mode);
2566
2567    if (CC_UNLIKELY(mHasShadow)) {
2568        drawTextShadow(paint, text, bytesCount, count, positions, fontRenderer, alpha, mode,
2569                0.0f, 0.0f);
2570    }
2571
2572    // Pick the appropriate texture filtering
2573    bool linearFilter = mSnapshot->transform->changesBounds();
2574    if (pureTranslate && !linearFilter) {
2575        linearFilter = fabs(y - (int) y) > 0.0f || fabs(x - (int) x) > 0.0f;
2576    }
2577
2578    mCaches.activeTexture(0);
2579    setupDraw();
2580    setupDrawTextGamma(paint);
2581    setupDrawDirtyRegionsDisabled();
2582    setupDrawWithTexture(true);
2583    setupDrawAlpha8Color(paint->getColor(), alpha);
2584    setupDrawColorFilter();
2585    setupDrawShader();
2586    setupDrawBlending(true, mode);
2587    setupDrawProgram();
2588    setupDrawModelView(x, y, x, y, pureTranslate, true);
2589    setupDrawTexture(fontRenderer.getTexture(linearFilter));
2590    setupDrawPureColorUniforms();
2591    setupDrawColorFilterUniforms();
2592    setupDrawShaderUniforms(pureTranslate);
2593    setupDrawTextGammaUniforms();
2594
2595    const Rect* clip = pureTranslate ? mSnapshot->clipRect : &mSnapshot->getLocalClip();
2596    Rect bounds(FLT_MAX / 2.0f, FLT_MAX / 2.0f, FLT_MIN / 2.0f, FLT_MIN / 2.0f);
2597
2598    const bool hasActiveLayer = hasLayer();
2599
2600    if (fontRenderer.renderPosText(paint, clip, text, 0, bytesCount, count, x, y,
2601            positions, hasActiveLayer ? &bounds : NULL)) {
2602        if (hasActiveLayer) {
2603            if (!pureTranslate) {
2604                mSnapshot->transform->mapRect(bounds);
2605            }
2606            dirtyLayerUnchecked(bounds, getRegion());
2607        }
2608    }
2609
2610    return DrawGlInfo::kStatusDrew;
2611}
2612
2613status_t OpenGLRenderer::drawText(const char* text, int bytesCount, int count,
2614        float x, float y, const float* positions, SkPaint* paint, float length) {
2615    if (text == NULL || count == 0 || mSnapshot->isIgnored() ||
2616            (paint->getAlpha() * mSnapshot->alpha == 0 && paint->getXfermode() == NULL)) {
2617        return DrawGlInfo::kStatusDone;
2618    }
2619
2620    if (length < 0.0f) length = paint->measureText(text, bytesCount);
2621    switch (paint->getTextAlign()) {
2622        case SkPaint::kCenter_Align:
2623            x -= length / 2.0f;
2624            break;
2625        case SkPaint::kRight_Align:
2626            x -= length;
2627            break;
2628        default:
2629            break;
2630    }
2631
2632    SkPaint::FontMetrics metrics;
2633    paint->getFontMetrics(&metrics, 0.0f);
2634    if (quickReject(x, y + metrics.fTop, x + length, y + metrics.fBottom)) {
2635        return DrawGlInfo::kStatusDone;
2636    }
2637
2638    const float oldX = x;
2639    const float oldY = y;
2640    const bool pureTranslate = mSnapshot->transform->isPureTranslate();
2641    if (CC_LIKELY(pureTranslate)) {
2642        x = (int) floorf(x + mSnapshot->transform->getTranslateX() + 0.5f);
2643        y = (int) floorf(y + mSnapshot->transform->getTranslateY() + 0.5f);
2644    }
2645
2646#if DEBUG_GLYPHS
2647    ALOGD("OpenGLRenderer drawText() with FontID=%d",
2648            SkTypeface::UniqueID(paint->getTypeface()));
2649#endif
2650
2651    FontRenderer& fontRenderer = mCaches.fontRenderer->getFontRenderer(paint);
2652    fontRenderer.setFont(paint, SkTypeface::UniqueID(paint->getTypeface()),
2653            paint->getTextSize());
2654
2655    int alpha;
2656    SkXfermode::Mode mode;
2657    getAlphaAndMode(paint, &alpha, &mode);
2658
2659    if (CC_UNLIKELY(mHasShadow)) {
2660        drawTextShadow(paint, text, bytesCount, count, positions, fontRenderer, alpha, mode,
2661                oldX, oldY);
2662    }
2663
2664    // Pick the appropriate texture filtering
2665    bool linearFilter = mSnapshot->transform->changesBounds();
2666    if (pureTranslate && !linearFilter) {
2667        linearFilter = fabs(y - (int) y) > 0.0f || fabs(x - (int) x) > 0.0f;
2668    }
2669
2670    // The font renderer will always use texture unit 0
2671    mCaches.activeTexture(0);
2672    setupDraw();
2673    setupDrawTextGamma(paint);
2674    setupDrawDirtyRegionsDisabled();
2675    setupDrawWithTexture(true);
2676    setupDrawAlpha8Color(paint->getColor(), alpha);
2677    setupDrawColorFilter();
2678    setupDrawShader();
2679    setupDrawBlending(true, mode);
2680    setupDrawProgram();
2681    setupDrawModelView(x, y, x, y, pureTranslate, true);
2682    // See comment above; the font renderer must use texture unit 0
2683    // assert(mTextureUnit == 0)
2684    setupDrawTexture(fontRenderer.getTexture(linearFilter));
2685    setupDrawPureColorUniforms();
2686    setupDrawColorFilterUniforms();
2687    setupDrawShaderUniforms(pureTranslate);
2688    setupDrawTextGammaUniforms();
2689
2690    const Rect* clip = pureTranslate ? mSnapshot->clipRect :
2691            (mSnapshot->hasPerspectiveTransform() ? NULL : &mSnapshot->getLocalClip());
2692    Rect bounds(FLT_MAX / 2.0f, FLT_MAX / 2.0f, FLT_MIN / 2.0f, FLT_MIN / 2.0f);
2693
2694    const bool hasActiveLayer = hasLayer();
2695
2696    bool status;
2697    if (CC_UNLIKELY(paint->getTextAlign() != SkPaint::kLeft_Align)) {
2698        SkPaint paintCopy(*paint);
2699        paintCopy.setTextAlign(SkPaint::kLeft_Align);
2700        status = fontRenderer.renderPosText(&paintCopy, clip, text, 0, bytesCount, count, x, y,
2701                positions, hasActiveLayer ? &bounds : NULL);
2702    } else {
2703        status = fontRenderer.renderPosText(paint, clip, text, 0, bytesCount, count, x, y,
2704                positions, hasActiveLayer ? &bounds : NULL);
2705    }
2706
2707    if (status && hasActiveLayer) {
2708        if (!pureTranslate) {
2709            mSnapshot->transform->mapRect(bounds);
2710        }
2711        dirtyLayerUnchecked(bounds, getRegion());
2712    }
2713
2714    drawTextDecorations(text, bytesCount, length, oldX, oldY, paint);
2715
2716    return DrawGlInfo::kStatusDrew;
2717}
2718
2719status_t OpenGLRenderer::drawTextOnPath(const char* text, int bytesCount, int count, SkPath* path,
2720        float hOffset, float vOffset, SkPaint* paint) {
2721    if (text == NULL || count == 0 || mSnapshot->isIgnored() ||
2722            (paint->getAlpha() == 0 && paint->getXfermode() == NULL)) {
2723        return DrawGlInfo::kStatusDone;
2724    }
2725
2726    FontRenderer& fontRenderer = mCaches.fontRenderer->getFontRenderer(paint);
2727    fontRenderer.setFont(paint, SkTypeface::UniqueID(paint->getTypeface()),
2728            paint->getTextSize());
2729
2730    int alpha;
2731    SkXfermode::Mode mode;
2732    getAlphaAndMode(paint, &alpha, &mode);
2733
2734    mCaches.activeTexture(0);
2735    setupDraw();
2736    setupDrawTextGamma(paint);
2737    setupDrawDirtyRegionsDisabled();
2738    setupDrawWithTexture(true);
2739    setupDrawAlpha8Color(paint->getColor(), alpha);
2740    setupDrawColorFilter();
2741    setupDrawShader();
2742    setupDrawBlending(true, mode);
2743    setupDrawProgram();
2744    setupDrawModelView(0.0f, 0.0f, 0.0f, 0.0f, false, true);
2745    setupDrawTexture(fontRenderer.getTexture(true));
2746    setupDrawPureColorUniforms();
2747    setupDrawColorFilterUniforms();
2748    setupDrawShaderUniforms(false);
2749    setupDrawTextGammaUniforms();
2750
2751    const Rect* clip = &mSnapshot->getLocalClip();
2752    Rect bounds(FLT_MAX / 2.0f, FLT_MAX / 2.0f, FLT_MIN / 2.0f, FLT_MIN / 2.0f);
2753
2754    const bool hasActiveLayer = hasLayer();
2755
2756    if (fontRenderer.renderTextOnPath(paint, clip, text, 0, bytesCount, count, path,
2757            hOffset, vOffset, hasActiveLayer ? &bounds : NULL)) {
2758        if (hasActiveLayer) {
2759            mSnapshot->transform->mapRect(bounds);
2760            dirtyLayerUnchecked(bounds, getRegion());
2761        }
2762    }
2763
2764    return DrawGlInfo::kStatusDrew;
2765}
2766
2767status_t OpenGLRenderer::drawPath(SkPath* path, SkPaint* paint) {
2768    if (mSnapshot->isIgnored()) return DrawGlInfo::kStatusDone;
2769
2770    mCaches.activeTexture(0);
2771
2772    // TODO: Perform early clip test before we rasterize the path
2773    const PathTexture* texture = mCaches.pathCache.get(path, paint);
2774    if (!texture) return DrawGlInfo::kStatusDone;
2775    const AutoTexture autoCleanup(texture);
2776
2777    const float x = texture->left - texture->offset;
2778    const float y = texture->top - texture->offset;
2779
2780    drawPathTexture(texture, x, y, paint);
2781
2782    return DrawGlInfo::kStatusDrew;
2783}
2784
2785status_t OpenGLRenderer::drawLayer(Layer* layer, float x, float y, SkPaint* paint) {
2786    if (!layer) {
2787        return DrawGlInfo::kStatusDone;
2788    }
2789
2790    mat4* transform = NULL;
2791    if (layer->isTextureLayer()) {
2792        transform = &layer->getTransform();
2793        if (!transform->isIdentity()) {
2794            save(0);
2795            mSnapshot->transform->multiply(*transform);
2796        }
2797    }
2798
2799    Rect transformed;
2800    Rect clip;
2801    const bool rejected = quickRejectNoScissor(x, y,
2802            x + layer->layer.getWidth(), y + layer->layer.getHeight(), transformed, clip);
2803
2804    if (rejected) {
2805        if (transform && !transform->isIdentity()) {
2806            restore();
2807        }
2808        return DrawGlInfo::kStatusDone;
2809    }
2810
2811    bool debugLayerUpdate = false;
2812    if (updateLayer(layer, true)) {
2813        debugLayerUpdate = mCaches.debugLayersUpdates;
2814    }
2815
2816    mCaches.setScissorEnabled(mScissorOptimizationDisabled || !clip.contains(transformed));
2817    mCaches.activeTexture(0);
2818
2819    if (CC_LIKELY(!layer->region.isEmpty())) {
2820        SkiaColorFilter* oldFilter = mColorFilter;
2821        mColorFilter = layer->getColorFilter();
2822
2823        if (layer->region.isRect()) {
2824            composeLayerRect(layer, layer->regionRect);
2825        } else if (layer->mesh) {
2826            const float a = layer->getAlpha() / 255.0f;
2827            setupDraw();
2828            setupDrawWithTexture();
2829            setupDrawColor(a, a, a, a);
2830            setupDrawColorFilter();
2831            setupDrawBlending(layer->isBlend() || a < 1.0f, layer->getMode(), false);
2832            setupDrawProgram();
2833            setupDrawPureColorUniforms();
2834            setupDrawColorFilterUniforms();
2835            setupDrawTexture(layer->getTexture());
2836            if (CC_LIKELY(mSnapshot->transform->isPureTranslate())) {
2837                int tx = (int) floorf(x + mSnapshot->transform->getTranslateX() + 0.5f);
2838                int ty = (int) floorf(y + mSnapshot->transform->getTranslateY() + 0.5f);
2839
2840                layer->setFilter(GL_NEAREST);
2841                setupDrawModelViewTranslate(tx, ty,
2842                        tx + layer->layer.getWidth(), ty + layer->layer.getHeight(), true);
2843            } else {
2844                layer->setFilter(GL_LINEAR);
2845                setupDrawModelViewTranslate(x, y,
2846                        x + layer->layer.getWidth(), y + layer->layer.getHeight());
2847            }
2848            setupDrawMesh(&layer->mesh[0].position[0], &layer->mesh[0].texture[0]);
2849
2850            glDrawElements(GL_TRIANGLES, layer->meshElementCount,
2851                    GL_UNSIGNED_SHORT, layer->meshIndices);
2852
2853            finishDrawTexture();
2854
2855#if DEBUG_LAYERS_AS_REGIONS
2856            drawRegionRects(layer->region);
2857#endif
2858        }
2859
2860        mColorFilter = oldFilter;
2861
2862        if (debugLayerUpdate) {
2863            drawColorRect(x, y, x + layer->layer.getWidth(), y + layer->layer.getHeight(),
2864                    0x7f00ff00, SkXfermode::kSrcOver_Mode);
2865        }
2866    }
2867
2868    if (transform && !transform->isIdentity()) {
2869        restore();
2870    }
2871
2872    return DrawGlInfo::kStatusDrew;
2873}
2874
2875///////////////////////////////////////////////////////////////////////////////
2876// Shaders
2877///////////////////////////////////////////////////////////////////////////////
2878
2879void OpenGLRenderer::resetShader() {
2880    mShader = NULL;
2881}
2882
2883void OpenGLRenderer::setupShader(SkiaShader* shader) {
2884    mShader = shader;
2885    if (mShader) {
2886        mShader->set(&mCaches.textureCache, &mCaches.gradientCache);
2887    }
2888}
2889
2890///////////////////////////////////////////////////////////////////////////////
2891// Color filters
2892///////////////////////////////////////////////////////////////////////////////
2893
2894void OpenGLRenderer::resetColorFilter() {
2895    mColorFilter = NULL;
2896}
2897
2898void OpenGLRenderer::setupColorFilter(SkiaColorFilter* filter) {
2899    mColorFilter = filter;
2900}
2901
2902///////////////////////////////////////////////////////////////////////////////
2903// Drop shadow
2904///////////////////////////////////////////////////////////////////////////////
2905
2906void OpenGLRenderer::resetShadow() {
2907    mHasShadow = false;
2908}
2909
2910void OpenGLRenderer::setupShadow(float radius, float dx, float dy, int color) {
2911    mHasShadow = true;
2912    mShadowRadius = radius;
2913    mShadowDx = dx;
2914    mShadowDy = dy;
2915    mShadowColor = color;
2916}
2917
2918///////////////////////////////////////////////////////////////////////////////
2919// Draw filters
2920///////////////////////////////////////////////////////////////////////////////
2921
2922void OpenGLRenderer::resetPaintFilter() {
2923    mHasDrawFilter = false;
2924}
2925
2926void OpenGLRenderer::setupPaintFilter(int clearBits, int setBits) {
2927    mHasDrawFilter = true;
2928    mPaintFilterClearBits = clearBits & SkPaint::kAllFlags;
2929    mPaintFilterSetBits = setBits & SkPaint::kAllFlags;
2930}
2931
2932SkPaint* OpenGLRenderer::filterPaint(SkPaint* paint) {
2933    if (CC_LIKELY(!mHasDrawFilter || !paint)) return paint;
2934
2935    uint32_t flags = paint->getFlags();
2936
2937    mFilteredPaint = *paint;
2938    mFilteredPaint.setFlags((flags & ~mPaintFilterClearBits) | mPaintFilterSetBits);
2939
2940    return &mFilteredPaint;
2941}
2942
2943///////////////////////////////////////////////////////////////////////////////
2944// Drawing implementation
2945///////////////////////////////////////////////////////////////////////////////
2946
2947void OpenGLRenderer::drawPathTexture(const PathTexture* texture,
2948        float x, float y, SkPaint* paint) {
2949    if (quickReject(x, y, x + texture->width, y + texture->height)) {
2950        return;
2951    }
2952
2953    int alpha;
2954    SkXfermode::Mode mode;
2955    getAlphaAndMode(paint, &alpha, &mode);
2956
2957    setupDraw();
2958    setupDrawWithTexture(true);
2959    setupDrawAlpha8Color(paint->getColor(), alpha);
2960    setupDrawColorFilter();
2961    setupDrawShader();
2962    setupDrawBlending(true, mode);
2963    setupDrawProgram();
2964    setupDrawModelView(x, y, x + texture->width, y + texture->height);
2965    setupDrawTexture(texture->id);
2966    setupDrawPureColorUniforms();
2967    setupDrawColorFilterUniforms();
2968    setupDrawShaderUniforms();
2969    setupDrawMesh(NULL, (GLvoid*) gMeshTextureOffset);
2970
2971    glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
2972
2973    finishDrawTexture();
2974}
2975
2976// Same values used by Skia
2977#define kStdStrikeThru_Offset   (-6.0f / 21.0f)
2978#define kStdUnderline_Offset    (1.0f / 9.0f)
2979#define kStdUnderline_Thickness (1.0f / 18.0f)
2980
2981void OpenGLRenderer::drawTextDecorations(const char* text, int bytesCount, float length,
2982        float x, float y, SkPaint* paint) {
2983    // Handle underline and strike-through
2984    uint32_t flags = paint->getFlags();
2985    if (flags & (SkPaint::kUnderlineText_Flag | SkPaint::kStrikeThruText_Flag)) {
2986        SkPaint paintCopy(*paint);
2987        float underlineWidth = length;
2988        // If length is > 0.0f, we already measured the text for the text alignment
2989        if (length <= 0.0f) {
2990            underlineWidth = paintCopy.measureText(text, bytesCount);
2991        }
2992
2993        if (CC_LIKELY(underlineWidth > 0.0f)) {
2994            const float textSize = paintCopy.getTextSize();
2995            const float strokeWidth = fmax(textSize * kStdUnderline_Thickness, 1.0f);
2996
2997            const float left = x;
2998            float top = 0.0f;
2999
3000            int linesCount = 0;
3001            if (flags & SkPaint::kUnderlineText_Flag) linesCount++;
3002            if (flags & SkPaint::kStrikeThruText_Flag) linesCount++;
3003
3004            const int pointsCount = 4 * linesCount;
3005            float points[pointsCount];
3006            int currentPoint = 0;
3007
3008            if (flags & SkPaint::kUnderlineText_Flag) {
3009                top = y + textSize * kStdUnderline_Offset;
3010                points[currentPoint++] = left;
3011                points[currentPoint++] = top;
3012                points[currentPoint++] = left + underlineWidth;
3013                points[currentPoint++] = top;
3014            }
3015
3016            if (flags & SkPaint::kStrikeThruText_Flag) {
3017                top = y + textSize * kStdStrikeThru_Offset;
3018                points[currentPoint++] = left;
3019                points[currentPoint++] = top;
3020                points[currentPoint++] = left + underlineWidth;
3021                points[currentPoint++] = top;
3022            }
3023
3024            paintCopy.setStrokeWidth(strokeWidth);
3025
3026            drawLines(&points[0], pointsCount, &paintCopy);
3027        }
3028    }
3029}
3030
3031void OpenGLRenderer::drawColorRect(float left, float top, float right, float bottom,
3032        int color, SkXfermode::Mode mode, bool ignoreTransform) {
3033    // If a shader is set, preserve only the alpha
3034    if (mShader) {
3035        color |= 0x00ffffff;
3036    }
3037
3038    setupDraw();
3039    setupDrawNoTexture();
3040    setupDrawColor(color, ((color >> 24) & 0xFF) * mSnapshot->alpha);
3041    setupDrawShader();
3042    setupDrawColorFilter();
3043    setupDrawBlending(mode);
3044    setupDrawProgram();
3045    setupDrawModelView(left, top, right, bottom, ignoreTransform);
3046    setupDrawColorUniforms();
3047    setupDrawShaderUniforms(ignoreTransform);
3048    setupDrawColorFilterUniforms();
3049    setupDrawSimpleMesh();
3050
3051    glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
3052}
3053
3054void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom,
3055        Texture* texture, SkPaint* paint) {
3056    int alpha;
3057    SkXfermode::Mode mode;
3058    getAlphaAndMode(paint, &alpha, &mode);
3059
3060    texture->setWrap(GL_CLAMP_TO_EDGE, true);
3061
3062    if (CC_LIKELY(mSnapshot->transform->isPureTranslate())) {
3063        const float x = (int) floorf(left + mSnapshot->transform->getTranslateX() + 0.5f);
3064        const float y = (int) floorf(top + mSnapshot->transform->getTranslateY() + 0.5f);
3065
3066        texture->setFilter(GL_NEAREST, true);
3067        drawTextureMesh(x, y, x + texture->width, y + texture->height, texture->id,
3068                alpha / 255.0f, mode, texture->blend, (GLvoid*) NULL,
3069                (GLvoid*) gMeshTextureOffset, GL_TRIANGLE_STRIP, gMeshCount, false, true);
3070    } else {
3071        texture->setFilter(FILTER(paint), true);
3072        drawTextureMesh(left, top, right, bottom, texture->id, alpha / 255.0f, mode,
3073                texture->blend, (GLvoid*) NULL, (GLvoid*) gMeshTextureOffset,
3074                GL_TRIANGLE_STRIP, gMeshCount);
3075    }
3076}
3077
3078void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom,
3079        GLuint texture, float alpha, SkXfermode::Mode mode, bool blend) {
3080    drawTextureMesh(left, top, right, bottom, texture, alpha, mode, blend,
3081            (GLvoid*) NULL, (GLvoid*) gMeshTextureOffset, GL_TRIANGLE_STRIP, gMeshCount);
3082}
3083
3084void OpenGLRenderer::drawTextureMesh(float left, float top, float right, float bottom,
3085        GLuint texture, float alpha, SkXfermode::Mode mode, bool blend,
3086        GLvoid* vertices, GLvoid* texCoords, GLenum drawMode, GLsizei elementsCount,
3087        bool swapSrcDst, bool ignoreTransform, GLuint vbo, bool ignoreScale, bool dirty) {
3088
3089    setupDraw();
3090    setupDrawWithTexture();
3091    setupDrawColor(alpha, alpha, alpha, alpha);
3092    setupDrawColorFilter();
3093    setupDrawBlending(blend, mode, swapSrcDst);
3094    setupDrawProgram();
3095    if (!dirty) {
3096        setupDrawDirtyRegionsDisabled();
3097    }
3098    if (!ignoreScale) {
3099        setupDrawModelView(left, top, right, bottom, ignoreTransform);
3100    } else {
3101        setupDrawModelViewTranslate(left, top, right, bottom, ignoreTransform);
3102    }
3103    setupDrawPureColorUniforms();
3104    setupDrawColorFilterUniforms();
3105    setupDrawTexture(texture);
3106    setupDrawMesh(vertices, texCoords, vbo);
3107
3108    glDrawArrays(drawMode, 0, elementsCount);
3109
3110    finishDrawTexture();
3111}
3112
3113void OpenGLRenderer::chooseBlending(bool blend, SkXfermode::Mode mode,
3114        ProgramDescription& description, bool swapSrcDst) {
3115    blend = blend || mode != SkXfermode::kSrcOver_Mode;
3116
3117    if (blend) {
3118        // These blend modes are not supported by OpenGL directly and have
3119        // to be implemented using shaders. Since the shader will perform
3120        // the blending, turn blending off here
3121        // If the blend mode cannot be implemented using shaders, fall
3122        // back to the default SrcOver blend mode instead
3123        if (CC_UNLIKELY(mode > SkXfermode::kScreen_Mode)) {
3124            if (CC_UNLIKELY(mCaches.extensions.hasFramebufferFetch())) {
3125                description.framebufferMode = mode;
3126                description.swapSrcDst = swapSrcDst;
3127
3128                if (mCaches.blend) {
3129                    glDisable(GL_BLEND);
3130                    mCaches.blend = false;
3131                }
3132
3133                return;
3134            } else {
3135                mode = SkXfermode::kSrcOver_Mode;
3136            }
3137        }
3138
3139        if (!mCaches.blend) {
3140            glEnable(GL_BLEND);
3141        }
3142
3143        GLenum sourceMode = swapSrcDst ? gBlendsSwap[mode].src : gBlends[mode].src;
3144        GLenum destMode = swapSrcDst ? gBlendsSwap[mode].dst : gBlends[mode].dst;
3145
3146        if (sourceMode != mCaches.lastSrcMode || destMode != mCaches.lastDstMode) {
3147            glBlendFunc(sourceMode, destMode);
3148            mCaches.lastSrcMode = sourceMode;
3149            mCaches.lastDstMode = destMode;
3150        }
3151    } else if (mCaches.blend) {
3152        glDisable(GL_BLEND);
3153    }
3154    mCaches.blend = blend;
3155}
3156
3157bool OpenGLRenderer::useProgram(Program* program) {
3158    if (!program->isInUse()) {
3159        if (mCaches.currentProgram != NULL) mCaches.currentProgram->remove();
3160        program->use();
3161        mCaches.currentProgram = program;
3162        return false;
3163    }
3164    return true;
3165}
3166
3167void OpenGLRenderer::resetDrawTextureTexCoords(float u1, float v1, float u2, float v2) {
3168    TextureVertex* v = &mMeshVertices[0];
3169    TextureVertex::setUV(v++, u1, v1);
3170    TextureVertex::setUV(v++, u2, v1);
3171    TextureVertex::setUV(v++, u1, v2);
3172    TextureVertex::setUV(v++, u2, v2);
3173}
3174
3175void OpenGLRenderer::getAlphaAndMode(SkPaint* paint, int* alpha, SkXfermode::Mode* mode) {
3176    getAlphaAndModeDirect(paint, alpha,  mode);
3177    *alpha *= mSnapshot->alpha;
3178}
3179
3180}; // namespace uirenderer
3181}; // namespace android
3182