OpenGLRenderer.cpp revision 1f8c9602eeff0a35f8af70bd3fdcd770f0127775 
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 <SkTypeface.h>
25
26#include <cutils/properties.h>
27#include <utils/Log.h>
28
29#include "OpenGLRenderer.h"
30#include "Properties.h"
31
32namespace android {
33namespace uirenderer {
34
35///////////////////////////////////////////////////////////////////////////////
36// Defines
37///////////////////////////////////////////////////////////////////////////////
38
39#define DEFAULT_TEXTURE_CACHE_SIZE 20.0f
40#define DEFAULT_LAYER_CACHE_SIZE 6.0f
41#define DEFAULT_PATH_CACHE_SIZE 6.0f
42#define DEFAULT_PATCH_CACHE_SIZE 100
43#define DEFAULT_GRADIENT_CACHE_SIZE 0.5f
44#define DEFAULT_DROP_SHADOW_CACHE_SIZE 1.0f
45
46#define REQUIRED_TEXTURE_UNITS_COUNT 3
47
48// Converts a number of mega-bytes into bytes
49#define MB(s) s * 1024 * 1024
50
51// Generates simple and textured vertices
52#define FV(x, y, u, v) { { x, y }, { u, v } }
53
54///////////////////////////////////////////////////////////////////////////////
55// Globals
56///////////////////////////////////////////////////////////////////////////////
57
58// This array is never used directly but used as a memcpy source in the
59// OpenGLRenderer constructor
60static const TextureVertex gMeshVertices[] = {
61        FV(0.0f, 0.0f, 0.0f, 0.0f),
62        FV(1.0f, 0.0f, 1.0f, 0.0f),
63        FV(0.0f, 1.0f, 0.0f, 1.0f),
64        FV(1.0f, 1.0f, 1.0f, 1.0f)
65};
66static const GLsizei gMeshStride = sizeof(TextureVertex);
67static const GLsizei gMeshCount = 4;
68
69/**
70 * Structure mapping Skia xfermodes to OpenGL blending factors.
71 */
72struct Blender {
73    SkXfermode::Mode mode;
74    GLenum src;
75    GLenum dst;
76}; // struct Blender
77
78// In this array, the index of each Blender equals the value of the first
79// entry. For instance, gBlends[1] == gBlends[SkXfermode::kSrc_Mode]
80static const Blender gBlends[] = {
81        { SkXfermode::kClear_Mode,   GL_ZERO,                 GL_ZERO },
82        { SkXfermode::kSrc_Mode,     GL_ONE,                  GL_ZERO },
83        { SkXfermode::kDst_Mode,     GL_ZERO,                 GL_ONE },
84        { SkXfermode::kSrcOver_Mode, GL_ONE,                  GL_ONE_MINUS_SRC_ALPHA },
85        { SkXfermode::kDstOver_Mode, GL_ONE_MINUS_DST_ALPHA,  GL_ONE },
86        { SkXfermode::kSrcIn_Mode,   GL_DST_ALPHA,            GL_ZERO },
87        { SkXfermode::kDstIn_Mode,   GL_ZERO,                 GL_SRC_ALPHA },
88        { SkXfermode::kSrcOut_Mode,  GL_ONE_MINUS_DST_ALPHA,  GL_ZERO },
89        { SkXfermode::kDstOut_Mode,  GL_ZERO,                 GL_ONE_MINUS_SRC_ALPHA },
90        { SkXfermode::kSrcATop_Mode, GL_DST_ALPHA,            GL_ONE_MINUS_SRC_ALPHA },
91        { SkXfermode::kDstATop_Mode, GL_ONE_MINUS_DST_ALPHA,  GL_SRC_ALPHA },
92        { SkXfermode::kXor_Mode,     GL_ONE_MINUS_DST_ALPHA,  GL_ONE_MINUS_SRC_ALPHA }
93};
94
95static const GLenum gTextureUnits[] = {
96        GL_TEXTURE0,
97        GL_TEXTURE1,
98        GL_TEXTURE2
99};
100
101///////////////////////////////////////////////////////////////////////////////
102// Constructors/destructor
103///////////////////////////////////////////////////////////////////////////////
104
105OpenGLRenderer::OpenGLRenderer():
106        mBlend(false), mLastSrcMode(GL_ZERO), mLastDstMode(GL_ZERO),
107        mTextureCache(MB(DEFAULT_TEXTURE_CACHE_SIZE)),
108        mLayerCache(MB(DEFAULT_LAYER_CACHE_SIZE)),
109        mGradientCache(MB(DEFAULT_GRADIENT_CACHE_SIZE)),
110        mPathCache(MB(DEFAULT_PATH_CACHE_SIZE)),
111        mPatchCache(DEFAULT_PATCH_CACHE_SIZE),
112        mDropShadowCache(MB(DEFAULT_DROP_SHADOW_CACHE_SIZE)) {
113    LOGD("Create OpenGLRenderer");
114
115    char property[PROPERTY_VALUE_MAX];
116    if (property_get(PROPERTY_TEXTURE_CACHE_SIZE, property, NULL) > 0) {
117        LOGD("  Setting texture cache size to %sMB", property);
118        mTextureCache.setMaxSize(MB(atof(property)));
119    } else {
120        LOGD("  Using default texture cache size of %.2fMB", DEFAULT_TEXTURE_CACHE_SIZE);
121    }
122
123    if (property_get(PROPERTY_LAYER_CACHE_SIZE, property, NULL) > 0) {
124        LOGD("  Setting layer cache size to %sMB", property);
125        mLayerCache.setMaxSize(MB(atof(property)));
126    } else {
127        LOGD("  Using default layer cache size of %.2fMB", DEFAULT_LAYER_CACHE_SIZE);
128    }
129
130    if (property_get(PROPERTY_GRADIENT_CACHE_SIZE, property, NULL) > 0) {
131        LOGD("  Setting gradient cache size to %sMB", property);
132        mGradientCache.setMaxSize(MB(atof(property)));
133    } else {
134        LOGD("  Using default gradient cache size of %.2fMB", DEFAULT_GRADIENT_CACHE_SIZE);
135    }
136
137    if (property_get(PROPERTY_PATH_CACHE_SIZE, property, NULL) > 0) {
138        LOGD("  Setting path cache size to %sMB", property);
139        mPathCache.setMaxSize(MB(atof(property)));
140    } else {
141        LOGD("  Using default path cache size of %.2fMB", DEFAULT_PATH_CACHE_SIZE);
142    }
143
144    if (property_get(PROPERTY_DROP_SHADOW_CACHE_SIZE, property, NULL) > 0) {
145        LOGD("  Setting drop shadow cache size to %sMB", property);
146        mDropShadowCache.setMaxSize(MB(atof(property)));
147    } else {
148        LOGD("  Using default drop shadow cache size of %.2fMB", DEFAULT_DROP_SHADOW_CACHE_SIZE);
149    }
150    mDropShadowCache.setFontRenderer(mFontRenderer);
151
152    mCurrentProgram = NULL;
153    mShader = NULL;
154    mColorFilter = NULL;
155    mHasShadow = false;
156
157    memcpy(mMeshVertices, gMeshVertices, sizeof(gMeshVertices));
158
159    mFirstSnapshot = new Snapshot;
160
161    GLint maxTextureUnits;
162    glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &maxTextureUnits);
163    if (maxTextureUnits < REQUIRED_TEXTURE_UNITS_COUNT) {
164        LOGW("At least %d texture units are required!", REQUIRED_TEXTURE_UNITS_COUNT);
165    }
166}
167
168OpenGLRenderer::~OpenGLRenderer() {
169    LOGD("Destroy OpenGLRenderer");
170
171    mTextureCache.clear();
172    mLayerCache.clear();
173    mGradientCache.clear();
174    mPathCache.clear();
175    mPatchCache.clear();
176    mProgramCache.clear();
177    mDropShadowCache.clear();
178}
179
180///////////////////////////////////////////////////////////////////////////////
181// Setup
182///////////////////////////////////////////////////////////////////////////////
183
184void OpenGLRenderer::setViewport(int width, int height) {
185    glViewport(0, 0, width, height);
186    mOrthoMatrix.loadOrtho(0, width, height, 0, -1, 1);
187
188    mWidth = width;
189    mHeight = height;
190    mFirstSnapshot->height = height;
191    mFirstSnapshot->viewport.set(0, 0, width, height);
192}
193
194void OpenGLRenderer::prepare() {
195    mSnapshot = new Snapshot(mFirstSnapshot);
196    mSaveCount = 1;
197
198    glDisable(GL_SCISSOR_TEST);
199
200    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
201    glClear(GL_COLOR_BUFFER_BIT);
202
203    glEnable(GL_SCISSOR_TEST);
204    glScissor(0, 0, mWidth, mHeight);
205
206    mSnapshot->setClip(0.0f, 0.0f, mWidth, mHeight);
207}
208
209///////////////////////////////////////////////////////////////////////////////
210// State management
211///////////////////////////////////////////////////////////////////////////////
212
213int OpenGLRenderer::getSaveCount() const {
214    return mSaveCount;
215}
216
217int OpenGLRenderer::save(int flags) {
218    return saveSnapshot();
219}
220
221void OpenGLRenderer::restore() {
222    if (mSaveCount > 1) {
223        restoreSnapshot();
224    }
225}
226
227void OpenGLRenderer::restoreToCount(int saveCount) {
228    if (saveCount < 1) saveCount = 1;
229
230    while (mSaveCount > saveCount) {
231        restoreSnapshot();
232    }
233}
234
235int OpenGLRenderer::saveSnapshot() {
236    mSnapshot = new Snapshot(mSnapshot);
237    return mSaveCount++;
238}
239
240bool OpenGLRenderer::restoreSnapshot() {
241    bool restoreClip = mSnapshot->flags & Snapshot::kFlagClipSet;
242    bool restoreLayer = mSnapshot->flags & Snapshot::kFlagIsLayer;
243    bool restoreOrtho = mSnapshot->flags & Snapshot::kFlagDirtyOrtho;
244
245    sp<Snapshot> current = mSnapshot;
246    sp<Snapshot> previous = mSnapshot->previous;
247
248    if (restoreOrtho) {
249        Rect& r = previous->viewport;
250        glViewport(r.left, r.top, r.right, r.bottom);
251        mOrthoMatrix.load(current->orthoMatrix);
252    }
253
254    if (restoreLayer) {
255        composeLayer(current, previous);
256    }
257
258    mSaveCount--;
259    mSnapshot = previous;
260
261    if (restoreClip) {
262        setScissorFromClip();
263    }
264
265    return restoreClip;
266}
267
268///////////////////////////////////////////////////////////////////////////////
269// Layers
270///////////////////////////////////////////////////////////////////////////////
271
272int OpenGLRenderer::saveLayer(float left, float top, float right, float bottom,
273        const SkPaint* p, int flags) {
274    int count = saveSnapshot();
275
276    int alpha = 255;
277    SkXfermode::Mode mode;
278
279    if (p) {
280        alpha = p->getAlpha();
281        const bool isMode = SkXfermode::IsMode(p->getXfermode(), &mode);
282        if (!isMode) {
283            // Assume SRC_OVER
284            mode = SkXfermode::kSrcOver_Mode;
285        }
286    } else {
287        mode = SkXfermode::kSrcOver_Mode;
288    }
289
290    createLayer(mSnapshot, left, top, right, bottom, alpha, mode, flags);
291
292    return count;
293}
294
295int OpenGLRenderer::saveLayerAlpha(float left, float top, float right, float bottom,
296        int alpha, int flags) {
297    int count = saveSnapshot();
298    createLayer(mSnapshot, left, top, right, bottom, alpha, SkXfermode::kSrcOver_Mode, flags);
299    return count;
300}
301
302bool OpenGLRenderer::createLayer(sp<Snapshot> snapshot, float left, float top,
303        float right, float bottom, int alpha, SkXfermode::Mode mode,int flags) {
304    LAYER_LOGD("Requesting layer %fx%f", right - left, bottom - top);
305    LAYER_LOGD("Layer cache size = %d", mLayerCache.getSize());
306
307    GLuint previousFbo = snapshot->previous.get() ? snapshot->previous->fbo : 0;
308    LayerSize size(right - left, bottom - top);
309
310    Layer* layer = mLayerCache.get(size, previousFbo);
311    if (!layer) {
312        return false;
313    }
314
315    glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
316
317    // Clear the FBO
318    glDisable(GL_SCISSOR_TEST);
319    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
320    glClear(GL_COLOR_BUFFER_BIT);
321    glEnable(GL_SCISSOR_TEST);
322
323    layer->mode = mode;
324    layer->alpha = alpha / 255.0f;
325    layer->layer.set(left, top, right, bottom);
326
327    // Save the layer in the snapshot
328    snapshot->flags |= Snapshot::kFlagIsLayer;
329    snapshot->layer = layer;
330    snapshot->fbo = layer->fbo;
331
332    snapshot->transform.loadTranslate(-left, -top, 0.0f);
333    snapshot->setClip(0.0f, 0.0f, right - left, bottom - top);
334    snapshot->viewport.set(0.0f, 0.0f, right - left, bottom - top);
335    snapshot->height = bottom - top;
336    snapshot->flags |= Snapshot::kFlagDirtyOrtho;
337    snapshot->orthoMatrix.load(mOrthoMatrix);
338
339    setScissorFromClip();
340
341    // Change the ortho projection
342    glViewport(0, 0, right - left, bottom - top);
343    // Don't flip the FBO, it will get flipped when drawing back to the framebuffer
344    mOrthoMatrix.loadOrtho(0.0f, right - left, 0.0f, bottom - top, -1.0f, 1.0f);
345
346    return true;
347}
348
349void OpenGLRenderer::composeLayer(sp<Snapshot> current, sp<Snapshot> previous) {
350    if (!current->layer) {
351        LOGE("Attempting to compose a layer that does not exist");
352        return;
353    }
354
355    // Unbind current FBO and restore previous one
356    // Most of the time, previous->fbo will be 0 to bind the default buffer
357    glBindFramebuffer(GL_FRAMEBUFFER, previous->fbo);
358
359    // Restore the clip from the previous snapshot
360    const Rect& clip = previous->clipRect;
361    glScissor(clip.left, mHeight - clip.bottom, clip.getWidth(), clip.getHeight());
362
363    Layer* layer = current->layer;
364    const Rect& rect = layer->layer;
365
366    drawTextureRect(rect.left, rect.top, rect.right, rect.bottom,
367            layer->texture, layer->alpha, layer->mode, layer->blend);
368
369    LayerSize size(rect.getWidth(), rect.getHeight());
370    // Failing to add the layer to the cache should happen only if the
371    // layer is too large
372    if (!mLayerCache.put(size, layer)) {
373        LAYER_LOGD("Deleting layer");
374
375        glDeleteFramebuffers(1, &layer->fbo);
376        glDeleteTextures(1, &layer->texture);
377
378        delete layer;
379    }
380}
381
382///////////////////////////////////////////////////////////////////////////////
383// Transforms
384///////////////////////////////////////////////////////////////////////////////
385
386void OpenGLRenderer::translate(float dx, float dy) {
387    mSnapshot->transform.translate(dx, dy, 0.0f);
388}
389
390void OpenGLRenderer::rotate(float degrees) {
391    mSnapshot->transform.rotate(degrees, 0.0f, 0.0f, 1.0f);
392}
393
394void OpenGLRenderer::scale(float sx, float sy) {
395    mSnapshot->transform.scale(sx, sy, 1.0f);
396}
397
398void OpenGLRenderer::setMatrix(SkMatrix* matrix) {
399    mSnapshot->transform.load(*matrix);
400}
401
402void OpenGLRenderer::getMatrix(SkMatrix* matrix) {
403    mSnapshot->transform.copyTo(*matrix);
404}
405
406void OpenGLRenderer::concatMatrix(SkMatrix* matrix) {
407    mat4 m(*matrix);
408    mSnapshot->transform.multiply(m);
409}
410
411///////////////////////////////////////////////////////////////////////////////
412// Clipping
413///////////////////////////////////////////////////////////////////////////////
414
415void OpenGLRenderer::setScissorFromClip() {
416    const Rect& clip = mSnapshot->clipRect;
417    glScissor(clip.left, mSnapshot->height - clip.bottom, clip.getWidth(), clip.getHeight());
418}
419
420const Rect& OpenGLRenderer::getClipBounds() {
421    return mSnapshot->getLocalClip();
422}
423
424bool OpenGLRenderer::quickReject(float left, float top, float right, float bottom) {
425    Rect r(left, top, right, bottom);
426    mSnapshot->transform.mapRect(r);
427    return !mSnapshot->clipRect.intersects(r);
428}
429
430bool OpenGLRenderer::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) {
431    bool clipped = mSnapshot->clip(left, top, right, bottom, op);
432    if (clipped) {
433        setScissorFromClip();
434    }
435    return !mSnapshot->clipRect.isEmpty();
436}
437
438///////////////////////////////////////////////////////////////////////////////
439// Drawing
440///////////////////////////////////////////////////////////////////////////////
441
442void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, float left, float top, const SkPaint* paint) {
443    const float right = left + bitmap->width();
444    const float bottom = top + bitmap->height();
445
446    if (quickReject(left, top, right, bottom)) {
447        return;
448    }
449
450    glActiveTexture(GL_TEXTURE0);
451    const Texture* texture = mTextureCache.get(bitmap);
452    if (!texture) return;
453    const AutoTexture autoCleanup(texture);
454
455    drawTextureRect(left, top, right, bottom, texture, paint);
456}
457
458void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, const SkMatrix* matrix, const SkPaint* paint) {
459    Rect r(0.0f, 0.0f, bitmap->width(), bitmap->height());
460    const mat4 transform(*matrix);
461    transform.mapRect(r);
462
463    if (quickReject(r.left, r.top, r.right, r.bottom)) {
464        return;
465    }
466
467    glActiveTexture(GL_TEXTURE0);
468    const Texture* texture = mTextureCache.get(bitmap);
469    if (!texture) return;
470    const AutoTexture autoCleanup(texture);
471
472    drawTextureRect(r.left, r.top, r.right, r.bottom, texture, paint);
473}
474
475void OpenGLRenderer::drawBitmap(SkBitmap* bitmap,
476         float srcLeft, float srcTop, float srcRight, float srcBottom,
477         float dstLeft, float dstTop, float dstRight, float dstBottom,
478         const SkPaint* paint) {
479    if (quickReject(dstLeft, dstTop, dstRight, dstBottom)) {
480        return;
481    }
482
483    glActiveTexture(GL_TEXTURE0);
484    const Texture* texture = mTextureCache.get(bitmap);
485    if (!texture) return;
486    const AutoTexture autoCleanup(texture);
487
488    const float width = texture->width;
489    const float height = texture->height;
490
491    const float u1 = srcLeft / width;
492    const float v1 = srcTop / height;
493    const float u2 = srcRight / width;
494    const float v2 = srcBottom / height;
495
496    resetDrawTextureTexCoords(u1, v1, u2, v2);
497
498    drawTextureRect(dstLeft, dstTop, dstRight, dstBottom, texture, paint);
499
500    resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f);
501}
502
503void OpenGLRenderer::drawPatch(SkBitmap* bitmap, Res_png_9patch* patch,
504        float left, float top, float right, float bottom, const SkPaint* paint) {
505    if (quickReject(left, top, right, bottom)) {
506        return;
507    }
508
509    glActiveTexture(GL_TEXTURE0);
510    const Texture* texture = mTextureCache.get(bitmap);
511    if (!texture) return;
512    const AutoTexture autoCleanup(texture);
513
514    int alpha;
515    SkXfermode::Mode mode;
516    getAlphaAndMode(paint, &alpha, &mode);
517
518    Patch* mesh = mPatchCache.get(patch);
519    mesh->updateVertices(bitmap, left, top, right, bottom,
520            &patch->xDivs[0], &patch->yDivs[0], patch->numXDivs, patch->numYDivs);
521
522    // Specify right and bottom as +1.0f from left/top to prevent scaling since the
523    // patch mesh already defines the final size
524    drawTextureMesh(left, top, left + 1.0f, top + 1.0f, texture->id, alpha / 255.0f,
525            mode, texture->blend, &mesh->vertices[0].position[0],
526            &mesh->vertices[0].texture[0], mesh->indices, mesh->indicesCount);
527}
528
529void OpenGLRenderer::drawColor(int color, SkXfermode::Mode mode) {
530    const Rect& clip = mSnapshot->clipRect;
531    drawColorRect(clip.left, clip.top, clip.right, clip.bottom, color, mode, true);
532}
533
534void OpenGLRenderer::drawRect(float left, float top, float right, float bottom, const SkPaint* p) {
535    if (quickReject(left, top, right, bottom)) {
536        return;
537    }
538
539    SkXfermode::Mode mode;
540
541    const bool isMode = SkXfermode::IsMode(p->getXfermode(), &mode);
542    if (!isMode) {
543        // Assume SRC_OVER
544        mode = SkXfermode::kSrcOver_Mode;
545    }
546
547    // Skia draws using the color's alpha channel if < 255
548    // Otherwise, it uses the paint's alpha
549    int color = p->getColor();
550    if (((color >> 24) & 0xff) == 255) {
551        color |= p->getAlpha() << 24;
552    }
553
554    drawColorRect(left, top, right, bottom, color, mode);
555}
556
557void OpenGLRenderer::drawText(const char* text, int bytesCount, int count,
558        float x, float y, SkPaint* paint) {
559    if (text == NULL || count == 0 || (paint->getAlpha() == 0 && paint->getXfermode() == NULL)) {
560        return;
561    }
562
563    float length = -1.0f;
564    switch (paint->getTextAlign()) {
565        case SkPaint::kCenter_Align:
566            length = paint->measureText(text, bytesCount);
567            x -= length / 2.0f;
568            break;
569        case SkPaint::kRight_Align:
570            length = paint->measureText(text, bytesCount);
571            x -= length;
572            break;
573        default:
574            break;
575    }
576
577    int alpha;
578    SkXfermode::Mode mode;
579    getAlphaAndMode(paint, &alpha, &mode);
580
581    uint32_t color = paint->getColor();
582    const GLfloat a = alpha / 255.0f;
583    const GLfloat r = a * ((color >> 16) & 0xFF) / 255.0f;
584    const GLfloat g = a * ((color >>  8) & 0xFF) / 255.0f;
585    const GLfloat b = a * ((color      ) & 0xFF) / 255.0f;
586
587    mFontRenderer.setFont(paint, SkTypeface::UniqueID(paint->getTypeface()), paint->getTextSize());
588    if (mHasShadow) {
589        glActiveTexture(gTextureUnits[0]);
590        const ShadowTexture* shadow = mDropShadowCache.get(paint, text, bytesCount,
591                count, mShadowRadius);
592        const AutoTexture autoCleanup(shadow);
593
594        setupShadow(shadow, x, y, mode, a);
595
596        // Draw the mesh
597        glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
598        glDisableVertexAttribArray(mCurrentProgram->getAttrib("texCoords"));
599    }
600
601    GLuint textureUnit = 0;
602    glActiveTexture(gTextureUnits[textureUnit]);
603
604    setupTextureAlpha8(mFontRenderer.getTexture(), 0, 0, textureUnit, x, y, r, g, b, a,
605            mode, false, true);
606
607    const Rect& clip = mSnapshot->getLocalClip();
608    mFontRenderer.renderText(paint, &clip, text, 0, bytesCount, count, x, y);
609
610    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
611    glDisableVertexAttribArray(mCurrentProgram->getAttrib("texCoords"));
612
613    drawTextDecorations(text, bytesCount, length, x, y, paint);
614}
615
616void OpenGLRenderer::drawPath(SkPath* path, SkPaint* paint) {
617    GLuint textureUnit = 0;
618    glActiveTexture(gTextureUnits[textureUnit]);
619
620    const PathTexture* texture = mPathCache.get(path, paint);
621    if (!texture) return;
622    const AutoTexture autoCleanup(texture);
623
624    int alpha;
625    SkXfermode::Mode mode;
626    getAlphaAndMode(paint, &alpha, &mode);
627
628    uint32_t color = paint->getColor();
629    const GLfloat a = alpha / 255.0f;
630    const GLfloat r = a * ((color >> 16) & 0xFF) / 255.0f;
631    const GLfloat g = a * ((color >>  8) & 0xFF) / 255.0f;
632    const GLfloat b = a * ((color      ) & 0xFF) / 255.0f;
633
634    const float x = texture->left - texture->offset;
635    const float y = texture->top - texture->offset;
636
637    setupTextureAlpha8(texture, textureUnit, x, y, r, g, b, a, mode, true, true);
638
639    // Draw the mesh
640    glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
641    glDisableVertexAttribArray(mCurrentProgram->getAttrib("texCoords"));
642}
643
644///////////////////////////////////////////////////////////////////////////////
645// Shaders
646///////////////////////////////////////////////////////////////////////////////
647
648void OpenGLRenderer::resetShader() {
649    mShader = NULL;
650}
651
652void OpenGLRenderer::setupShader(SkiaShader* shader) {
653    mShader = shader;
654    if (mShader) {
655        mShader->set(&mTextureCache, &mGradientCache);
656    }
657}
658
659///////////////////////////////////////////////////////////////////////////////
660// Color filters
661///////////////////////////////////////////////////////////////////////////////
662
663void OpenGLRenderer::resetColorFilter() {
664    mColorFilter = NULL;
665}
666
667void OpenGLRenderer::setupColorFilter(SkiaColorFilter* filter) {
668    mColorFilter = filter;
669}
670
671///////////////////////////////////////////////////////////////////////////////
672// Drop shadow
673///////////////////////////////////////////////////////////////////////////////
674
675void OpenGLRenderer::resetShadow() {
676    mHasShadow = false;
677}
678
679void OpenGLRenderer::setupShadow(float radius, float dx, float dy, int color) {
680    mHasShadow = true;
681    mShadowRadius = radius;
682    mShadowDx = dx;
683    mShadowDy = dy;
684    mShadowColor = color;
685}
686
687///////////////////////////////////////////////////////////////////////////////
688// Drawing implementation
689///////////////////////////////////////////////////////////////////////////////
690
691void OpenGLRenderer::setupShadow(const ShadowTexture* texture, float x, float y,
692        SkXfermode::Mode mode, float alpha) {
693    const float sx = x - texture->left + mShadowDx;
694    const float sy = y - texture->top + mShadowDy;
695
696    const int shadowAlpha = ((mShadowColor >> 24) & 0xFF);
697    const GLfloat a = shadowAlpha < 255 ? shadowAlpha / 255.0f : alpha;
698    const GLfloat r = a * ((mShadowColor >> 16) & 0xFF) / 255.0f;
699    const GLfloat g = a * ((mShadowColor >>  8) & 0xFF) / 255.0f;
700    const GLfloat b = a * ((mShadowColor      ) & 0xFF) / 255.0f;
701
702    GLuint textureUnit = 0;
703    setupTextureAlpha8(texture, textureUnit, sx, sy, r, g, b, a, mode, true, false);
704}
705
706void OpenGLRenderer::setupTextureAlpha8(const Texture* texture, GLuint& textureUnit,
707        float x, float y, float r, float g, float b, float a, SkXfermode::Mode mode,
708        bool transforms, bool applyFilters) {
709    setupTextureAlpha8(texture->id, texture->width, texture->height, textureUnit,
710            x, y, r, g, b, a, mode, transforms, applyFilters);
711}
712
713void OpenGLRenderer::setupTextureAlpha8(GLuint texture, uint32_t width, uint32_t height,
714        GLuint& textureUnit, float x, float y, float r, float g, float b, float a,
715        SkXfermode::Mode mode, bool transforms, bool applyFilters) {
716     // Describe the required shaders
717     ProgramDescription description;
718     description.hasTexture = true;
719     description.hasAlpha8Texture = true;
720
721     if (applyFilters) {
722         if (mShader) {
723             mShader->describe(description, mExtensions);
724         }
725         if (mColorFilter) {
726             mColorFilter->describe(description, mExtensions);
727         }
728     }
729
730     // Build and use the appropriate shader
731     useProgram(mProgramCache.get(description));
732
733     // Setup the blending mode
734     chooseBlending(true, mode);
735     bindTexture(texture, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, textureUnit);
736     glUniform1i(mCurrentProgram->getUniform("sampler"), textureUnit);
737
738     int texCoordsSlot = mCurrentProgram->getAttrib("texCoords");
739     glEnableVertexAttribArray(texCoordsSlot);
740
741     // Setup attributes
742     glVertexAttribPointer(mCurrentProgram->position, 2, GL_FLOAT, GL_FALSE,
743             gMeshStride, &mMeshVertices[0].position[0]);
744     glVertexAttribPointer(texCoordsSlot, 2, GL_FLOAT, GL_FALSE,
745             gMeshStride, &mMeshVertices[0].texture[0]);
746
747     // Setup uniforms
748     if (transforms) {
749         mModelView.loadTranslate(x, y, 0.0f);
750         mModelView.scale(width, height, 1.0f);
751     } else {
752         mModelView.loadIdentity();
753     }
754     mCurrentProgram->set(mOrthoMatrix, mModelView, mSnapshot->transform);
755     glUniform4f(mCurrentProgram->color, r, g, b, a);
756
757     textureUnit++;
758     if (applyFilters) {
759         // Setup attributes and uniforms required by the shaders
760         if (mShader) {
761             mShader->setupProgram(mCurrentProgram, mModelView, *mSnapshot, &textureUnit);
762         }
763         if (mColorFilter) {
764             mColorFilter->setupProgram(mCurrentProgram);
765         }
766     }
767}
768
769#define kStdStrikeThru_Offset   (-6.0f / 21.0f)
770#define kStdUnderline_Offset    (1.0f / 9.0f)
771#define kStdUnderline_Thickness (1.0f / 18.0f)
772
773void OpenGLRenderer::drawTextDecorations(const char* text, int bytesCount, float length,
774        float x, float y, SkPaint* paint) {
775    // Handle underline and strike-through
776    uint32_t flags = paint->getFlags();
777    if (flags & (SkPaint::kUnderlineText_Flag | SkPaint::kStrikeThruText_Flag)) {
778        float underlineWidth = length;
779        // If length is > 0.0f, we already measured the text for the text alignment
780        if (length <= 0.0f) {
781            underlineWidth = paint->measureText(text, bytesCount);
782        }
783
784        float offsetX = 0;
785        switch (paint->getTextAlign()) {
786            case SkPaint::kCenter_Align:
787                offsetX = underlineWidth * 0.5f;
788                break;
789            case SkPaint::kRight_Align:
790                offsetX = underlineWidth;
791                break;
792            default:
793                break;
794        }
795
796        if (underlineWidth > 0.0f) {
797            float textSize = paint->getTextSize();
798            float height = textSize * kStdUnderline_Thickness;
799
800            float left = x - offsetX;
801            float top = 0.0f;
802            float right = left + underlineWidth;
803            float bottom = 0.0f;
804
805            if (flags & SkPaint::kUnderlineText_Flag) {
806                top = y + textSize * kStdUnderline_Offset;
807                bottom = top + height;
808                drawRect(left, top, right, bottom, paint);
809            }
810
811            if (flags & SkPaint::kStrikeThruText_Flag) {
812                top = y + textSize * kStdStrikeThru_Offset;
813                bottom = top + height;
814                drawRect(left, top, right, bottom, paint);
815            }
816        }
817    }
818}
819
820void OpenGLRenderer::drawColorRect(float left, float top, float right, float bottom,
821        int color, SkXfermode::Mode mode, bool ignoreTransform) {
822    // If a shader is set, preserve only the alpha
823    if (mShader) {
824        color |= 0x00ffffff;
825    }
826
827    // Render using pre-multiplied alpha
828    const int alpha = (color >> 24) & 0xFF;
829    const GLfloat a = alpha / 255.0f;
830    const GLfloat r = a * ((color >> 16) & 0xFF) / 255.0f;
831    const GLfloat g = a * ((color >>  8) & 0xFF) / 255.0f;
832    const GLfloat b = a * ((color      ) & 0xFF) / 255.0f;
833
834    GLuint textureUnit = 0;
835
836    // Setup the blending mode
837    chooseBlending(alpha < 255 || (mShader && mShader->blend()), mode);
838
839    // Describe the required shaders
840    ProgramDescription description;
841    if (mShader) {
842        mShader->describe(description, mExtensions);
843    }
844    if (mColorFilter) {
845        mColorFilter->describe(description, mExtensions);
846    }
847
848    // Build and use the appropriate shader
849    useProgram(mProgramCache.get(description));
850
851    // Setup attributes
852    glVertexAttribPointer(mCurrentProgram->position, 2, GL_FLOAT, GL_FALSE,
853            gMeshStride, &mMeshVertices[0].position[0]);
854
855    // Setup uniforms
856    mModelView.loadTranslate(left, top, 0.0f);
857    mModelView.scale(right - left, bottom - top, 1.0f);
858    if (!ignoreTransform) {
859        mCurrentProgram->set(mOrthoMatrix, mModelView, mSnapshot->transform);
860    } else {
861        mat4 identity;
862        mCurrentProgram->set(mOrthoMatrix, mModelView, identity);
863    }
864    glUniform4f(mCurrentProgram->color, r, g, b, a);
865
866    // Setup attributes and uniforms required by the shaders
867    if (mShader) {
868        mShader->setupProgram(mCurrentProgram, mModelView, *mSnapshot, &textureUnit);
869    }
870    if (mColorFilter) {
871        mColorFilter->setupProgram(mCurrentProgram);
872    }
873
874    // Draw the mesh
875    glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
876}
877
878void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom,
879        const Texture* texture, const SkPaint* paint) {
880    int alpha;
881    SkXfermode::Mode mode;
882    getAlphaAndMode(paint, &alpha, &mode);
883
884    drawTextureMesh(left, top, right, bottom, texture->id, alpha / 255.0f, mode, texture->blend,
885            &mMeshVertices[0].position[0], &mMeshVertices[0].texture[0], NULL);
886}
887
888void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom,
889        GLuint texture, float alpha, SkXfermode::Mode mode, bool blend) {
890    drawTextureMesh(left, top, right, bottom, texture, alpha, mode, blend,
891            &mMeshVertices[0].position[0], &mMeshVertices[0].texture[0], NULL);
892}
893
894void OpenGLRenderer::drawTextureMesh(float left, float top, float right, float bottom,
895        GLuint texture, float alpha, SkXfermode::Mode mode, bool blend,
896        GLvoid* vertices, GLvoid* texCoords, GLvoid* indices, GLsizei elementsCount) {
897    ProgramDescription description;
898    description.hasTexture = true;
899    if (mColorFilter) {
900        mColorFilter->describe(description, mExtensions);
901    }
902
903    mModelView.loadTranslate(left, top, 0.0f);
904    mModelView.scale(right - left, bottom - top, 1.0f);
905
906    useProgram(mProgramCache.get(description));
907    mCurrentProgram->set(mOrthoMatrix, mModelView, mSnapshot->transform);
908
909    chooseBlending(blend || alpha < 1.0f, mode);
910
911    // Texture
912    bindTexture(texture, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, 0);
913    glUniform1i(mCurrentProgram->getUniform("sampler"), 0);
914
915    // Always premultiplied
916    glUniform4f(mCurrentProgram->color, alpha, alpha, alpha, alpha);
917
918    // Mesh
919    int texCoordsSlot = mCurrentProgram->getAttrib("texCoords");
920    glEnableVertexAttribArray(texCoordsSlot);
921    glVertexAttribPointer(mCurrentProgram->position, 2, GL_FLOAT, GL_FALSE,
922            gMeshStride, vertices);
923    glVertexAttribPointer(texCoordsSlot, 2, GL_FLOAT, GL_FALSE, gMeshStride, texCoords);
924
925    // Color filter
926    if (mColorFilter) {
927        mColorFilter->setupProgram(mCurrentProgram);
928    }
929
930    if (!indices) {
931        glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
932    } else {
933        glDrawElements(GL_TRIANGLES, elementsCount, GL_UNSIGNED_SHORT, indices);
934    }
935    glDisableVertexAttribArray(texCoordsSlot);
936}
937
938void OpenGLRenderer::chooseBlending(bool blend, SkXfermode::Mode mode, bool isPremultiplied) {
939    blend = blend || mode != SkXfermode::kSrcOver_Mode;
940    if (blend) {
941        if (!mBlend) {
942            glEnable(GL_BLEND);
943        }
944
945        GLenum sourceMode = gBlends[mode].src;
946        GLenum destMode = gBlends[mode].dst;
947        if (!isPremultiplied && sourceMode == GL_ONE) {
948            sourceMode = GL_SRC_ALPHA;
949        }
950
951        if (sourceMode != mLastSrcMode || destMode != mLastDstMode) {
952            glBlendFunc(sourceMode, destMode);
953            mLastSrcMode = sourceMode;
954            mLastDstMode = destMode;
955        }
956    } else if (mBlend) {
957        glDisable(GL_BLEND);
958    }
959    mBlend = blend;
960}
961
962bool OpenGLRenderer::useProgram(Program* program) {
963    if (!program->isInUse()) {
964        if (mCurrentProgram != NULL) mCurrentProgram->remove();
965        program->use();
966        mCurrentProgram = program;
967        return false;
968    }
969    return true;
970}
971
972void OpenGLRenderer::resetDrawTextureTexCoords(float u1, float v1, float u2, float v2) {
973    TextureVertex* v = &mMeshVertices[0];
974    TextureVertex::setUV(v++, u1, v1);
975    TextureVertex::setUV(v++, u2, v1);
976    TextureVertex::setUV(v++, u1, v2);
977    TextureVertex::setUV(v++, u2, v2);
978}
979
980void OpenGLRenderer::getAlphaAndMode(const SkPaint* paint, int* alpha, SkXfermode::Mode* mode) {
981    if (paint) {
982        const bool isMode = SkXfermode::IsMode(paint->getXfermode(), mode);
983        if (!isMode) {
984            // Assume SRC_OVER
985            *mode = SkXfermode::kSrcOver_Mode;
986        }
987
988        // Skia draws using the color's alpha channel if < 255
989        // Otherwise, it uses the paint's alpha
990        int color = paint->getColor();
991        *alpha = (color >> 24) & 0xFF;
992        if (*alpha == 255) {
993            *alpha = paint->getAlpha();
994        }
995    } else {
996        *mode = SkXfermode::kSrcOver_Mode;
997        *alpha = 255;
998    }
999}
1000
1001void OpenGLRenderer::bindTexture(GLuint texture, GLenum wrapS, GLenum wrapT, GLuint textureUnit) {
1002    glActiveTexture(gTextureUnits[textureUnit]);
1003    glBindTexture(GL_TEXTURE_2D, texture);
1004    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapS);
1005    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapT);
1006}
1007
1008}; // namespace uirenderer
1009}; // namespace android
1010