LayerRenderer.cpp revision 9ace8f5e79e76893fe4ca9e4d10f6c4056330485 
1/*
2 * Copyright (C) 2011 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 <ui/Rect.h>
20
21#include "LayerCache.h"
22#include "LayerRenderer.h"
23#include "Matrix.h"
24#include "Properties.h"
25#include "Rect.h"
26
27namespace android {
28namespace uirenderer {
29
30///////////////////////////////////////////////////////////////////////////////
31// Rendering
32///////////////////////////////////////////////////////////////////////////////
33
34void LayerRenderer::prepareDirty(float left, float top, float right, float bottom, bool opaque) {
35    LAYER_RENDERER_LOGD("Rendering into layer, fbo = %d", mLayer->getFbo());
36
37    glBindFramebuffer(GL_FRAMEBUFFER, mLayer->getFbo());
38
39    const float width = mLayer->layer.getWidth();
40    const float height = mLayer->layer.getHeight();
41
42#if RENDER_LAYERS_AS_REGIONS
43    Rect dirty(left, top, right, bottom);
44    if (dirty.isEmpty() || (dirty.left <= 0 && dirty.top <= 0 &&
45            dirty.right >= width && dirty.bottom >= height)) {
46        mLayer->region.clear();
47        dirty.set(0.0f, 0.0f, width, height);
48    } else {
49        dirty.intersect(0.0f, 0.0f, width, height);
50        android::Rect r(dirty.left, dirty.top, dirty.right, dirty.bottom);
51        mLayer->region.subtractSelf(r);
52    }
53
54    OpenGLRenderer::prepareDirty(dirty.left, dirty.top, dirty.right, dirty.bottom, opaque);
55#else
56    OpenGLRenderer::prepareDirty(0.0f, 0.0f, width, height, opaque);
57#endif
58}
59
60void LayerRenderer::finish() {
61    OpenGLRenderer::finish();
62
63    generateMesh();
64
65    LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->getFbo());
66
67    // No need to unbind our FBO, this will be taken care of by the caller
68    // who will invoke OpenGLRenderer::resume()
69}
70
71GLint LayerRenderer::getTargetFbo() {
72    return mLayer->getFbo();
73}
74
75///////////////////////////////////////////////////////////////////////////////
76// Dirty region tracking
77///////////////////////////////////////////////////////////////////////////////
78
79bool LayerRenderer::hasLayer() {
80    return true;
81}
82
83Region* LayerRenderer::getRegion() {
84#if RENDER_LAYERS_AS_REGIONS
85    if (getSnapshot()->flags & Snapshot::kFlagFboTarget) {
86        return OpenGLRenderer::getRegion();
87    }
88    return &mLayer->region;
89#else
90    return OpenGLRenderer::getRegion();
91#endif
92}
93
94void LayerRenderer::generateMesh() {
95#if RENDER_LAYERS_AS_REGIONS
96    if (mLayer->region.isRect() || mLayer->region.isEmpty()) {
97        if (mLayer->mesh) {
98            delete mLayer->mesh;
99            delete mLayer->meshIndices;
100
101            mLayer->mesh = NULL;
102            mLayer->meshIndices = NULL;
103            mLayer->meshElementCount = 0;
104        }
105
106        mLayer->setRegionAsRect();
107        return;
108    }
109
110    size_t count;
111    const android::Rect* rects = mLayer->region.getArray(&count);
112
113    GLsizei elementCount = count * 6;
114
115    if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
116        delete mLayer->mesh;
117        delete mLayer->meshIndices;
118
119        mLayer->mesh = NULL;
120        mLayer->meshIndices = NULL;
121    }
122
123    bool rebuildIndices = false;
124    if (!mLayer->mesh) {
125        mLayer->mesh = new TextureVertex[count * 4];
126        mLayer->meshIndices = new uint16_t[elementCount];
127        rebuildIndices = true;
128    }
129    mLayer->meshElementCount = elementCount;
130
131    const float texX = 1.0f / float(mLayer->getWidth());
132    const float texY = 1.0f / float(mLayer->getHeight());
133    const float height = mLayer->layer.getHeight();
134
135    TextureVertex* mesh = mLayer->mesh;
136    uint16_t* indices = mLayer->meshIndices;
137
138    for (size_t i = 0; i < count; i++) {
139        const android::Rect* r = &rects[i];
140
141        const float u1 = r->left * texX;
142        const float v1 = (height - r->top) * texY;
143        const float u2 = r->right * texX;
144        const float v2 = (height - r->bottom) * texY;
145
146        TextureVertex::set(mesh++, r->left, r->top, u1, v1);
147        TextureVertex::set(mesh++, r->right, r->top, u2, v1);
148        TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
149        TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
150
151        if (rebuildIndices) {
152            uint16_t quad = i * 4;
153            int index = i * 6;
154            indices[index    ] = quad;       // top-left
155            indices[index + 1] = quad + 1;   // top-right
156            indices[index + 2] = quad + 2;   // bottom-left
157            indices[index + 3] = quad + 2;   // bottom-left
158            indices[index + 4] = quad + 1;   // top-right
159            indices[index + 5] = quad + 3;   // bottom-right
160        }
161    }
162#endif
163}
164
165///////////////////////////////////////////////////////////////////////////////
166// Layers management
167///////////////////////////////////////////////////////////////////////////////
168
169Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) {
170    LAYER_RENDERER_LOGD("Creating new layer %dx%d", width, height);
171
172    GLuint fbo = Caches::getInstance().fboCache.get();
173    if (!fbo) {
174        LOGW("Could not obtain an FBO");
175        return NULL;
176    }
177
178    glActiveTexture(GL_TEXTURE0);
179    Layer* layer = Caches::getInstance().layerCache.get(width, height);
180    if (!layer) {
181        LOGW("Could not obtain a layer");
182        return NULL;
183    }
184
185    layer->setFbo(fbo);
186    layer->layer.set(0.0f, 0.0f, width, height);
187    layer->texCoords.set(0.0f, height / float(layer->getHeight()),
188            width / float(layer->getWidth()), 0.0f);
189    layer->setAlpha(255, SkXfermode::kSrcOver_Mode);
190    layer->setBlend(!isOpaque);
191    layer->setColorFilter(NULL);
192    layer->region.clear();
193
194    GLuint previousFbo;
195    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
196
197    glBindFramebuffer(GL_FRAMEBUFFER, layer->getFbo());
198    layer->bindTexture();
199
200    // Initialize the texture if needed
201    if (layer->isEmpty()) {
202        layer->setEmpty(false);
203        layer->allocateTexture(GL_RGBA, GL_UNSIGNED_BYTE);
204
205        if (glGetError() != GL_NO_ERROR) {
206            LOGD("Could not allocate texture");
207
208            glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
209            Caches::getInstance().fboCache.put(fbo);
210
211            layer->deleteTexture();
212            delete layer;
213
214            return NULL;
215        }
216    }
217
218    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
219            layer->getTexture(), 0);
220
221    glDisable(GL_SCISSOR_TEST);
222    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
223    glClear(GL_COLOR_BUFFER_BIT);
224    glEnable(GL_SCISSOR_TEST);
225
226    glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
227
228    return layer;
229}
230
231bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
232    if (layer) {
233        LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->getFbo(), width, height);
234
235        if (Caches::getInstance().layerCache.resize(layer, width, height)) {
236            layer->layer.set(0.0f, 0.0f, width, height);
237            layer->texCoords.set(0.0f, height / float(layer->getHeight()),
238                    width / float(layer->getWidth()), 0.0f);
239        } else {
240            layer->deleteTexture();
241            delete layer;
242            return false;
243        }
244    }
245
246    return true;
247}
248
249Layer* LayerRenderer::createTextureLayer(bool isOpaque) {
250    LAYER_RENDERER_LOGD("Creating new texture layer");
251
252    Layer* layer = new Layer(0, 0);
253    layer->setCacheable(false);
254    layer->setTextureLayer(true);
255    layer->setBlend(!isOpaque);
256    layer->setEmpty(true);
257    layer->setFbo(0);
258    layer->setAlpha(255, SkXfermode::kSrcOver_Mode);
259    layer->layer.set(0.0f, 0.0f, 0.0f, 0.0f);
260    layer->texCoords.set(0.0f, 1.0f, 0.0f, 1.0f);
261    layer->region.clear();
262    layer->setRenderTarget(GL_NONE); // see ::updateTextureLayer()
263
264    glActiveTexture(GL_TEXTURE0);
265    layer->generateTexture();
266
267    return layer;
268}
269
270void LayerRenderer::updateTextureLayer(Layer* layer, uint32_t width, uint32_t height,
271        bool isOpaque, GLenum renderTarget, float* transform) {
272    if (layer) {
273        layer->setBlend(!isOpaque);
274        layer->setSize(width, height);
275        layer->layer.set(0.0f, 0.0f, width, height);
276        layer->region.set(width, height);
277        layer->regionRect.set(0.0f, 0.0f, width, height);
278        layer->getTexTransform().load(transform);
279
280        if (renderTarget != layer->getRenderTarget()) {
281            layer->setRenderTarget(renderTarget);
282            layer->bindTexture();
283            layer->setFilter(GL_NEAREST, GL_NEAREST, false, true);
284            layer->setWrap(GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, false, true);
285        }
286    }
287}
288
289void LayerRenderer::destroyLayer(Layer* layer) {
290    if (layer) {
291        LAYER_RENDERER_LOGD("Destroying layer, fbo = %d", layer->getFbo());
292
293        if (layer->getFbo()) {
294            Caches::getInstance().fboCache.put(layer->getFbo());
295        }
296
297        if (!Caches::getInstance().layerCache.put(layer)) {
298            layer->deleteTexture();
299            delete layer;
300        } else {
301            layer->region.clear();
302        }
303    }
304}
305
306void LayerRenderer::destroyLayerDeferred(Layer* layer) {
307    if (layer) {
308        LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->getFbo());
309
310        Caches::getInstance().deleteLayerDeferred(layer);
311    }
312}
313
314bool LayerRenderer::copyLayer(Layer* layer, SkBitmap* bitmap) {
315    Caches& caches = Caches::getInstance();
316    if (layer && layer->isTextureLayer() && bitmap->width() <= caches.maxTextureSize &&
317            bitmap->height() <= caches.maxTextureSize) {
318
319        GLuint fbo = caches.fboCache.get();
320        if (!fbo) {
321            LOGW("Could not obtain an FBO");
322            return false;
323        }
324
325        SkAutoLockPixels alp(*bitmap);
326
327        GLuint texture;
328        GLuint previousFbo;
329
330        GLenum format;
331        GLenum type;
332
333        GLenum error = GL_NO_ERROR;
334        bool status = false;
335
336        switch (bitmap->config()) {
337            case SkBitmap::kA8_Config:
338                format = GL_ALPHA;
339                type = GL_UNSIGNED_BYTE;
340                break;
341            case SkBitmap::kRGB_565_Config:
342                format = GL_RGB;
343                type = GL_UNSIGNED_SHORT_5_6_5;
344                break;
345            case SkBitmap::kARGB_4444_Config:
346                format = GL_RGBA;
347                type = GL_UNSIGNED_SHORT_4_4_4_4;
348                break;
349            case SkBitmap::kARGB_8888_Config:
350            default:
351                format = GL_RGBA;
352                type = GL_UNSIGNED_BYTE;
353                break;
354        }
355
356        float alpha = layer->getAlpha();
357        SkXfermode::Mode mode = layer->getMode();
358
359        layer->setAlpha(255, SkXfermode::kSrc_Mode);
360        layer->setFbo(fbo);
361
362        glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
363        glBindFramebuffer(GL_FRAMEBUFFER, fbo);
364
365        glGenTextures(1, &texture);
366        if ((error = glGetError()) != GL_NO_ERROR) goto error;
367
368        glActiveTexture(GL_TEXTURE0);
369        glBindTexture(GL_TEXTURE_2D, texture);
370
371        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
372        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
373
374        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
375        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
376
377        glTexImage2D(GL_TEXTURE_2D, 0, format, bitmap->width(), bitmap->height(),
378                0, format, type, NULL);
379        if ((error = glGetError()) != GL_NO_ERROR) goto error;
380
381        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
382                GL_TEXTURE_2D, texture, 0);
383        if ((error = glGetError()) != GL_NO_ERROR) goto error;
384
385        {
386            LayerRenderer renderer(layer);
387            renderer.setViewport(bitmap->width(), bitmap->height());
388            renderer.OpenGLRenderer::prepareDirty(0.0f, 0.0f,
389                    bitmap->width(), bitmap->height(), !layer->isBlend());
390            if ((error = glGetError()) != GL_NO_ERROR) goto error;
391
392            {
393                Rect bounds;
394                bounds.set(0.0f, 0.0f, bitmap->width(), bitmap->height());
395                renderer.drawTextureLayer(layer, bounds);
396
397                glReadPixels(0, 0, bitmap->width(), bitmap->height(), format,
398                        type, bitmap->getPixels());
399
400                if ((error = glGetError()) != GL_NO_ERROR) goto error;
401            }
402
403            status = true;
404        }
405
406error:
407#if DEBUG_OPENGL
408        if (error != GL_NO_ERROR) {
409            LOGD("GL error while copying layer into bitmap = 0x%x", error);
410        }
411#endif
412
413        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
414        layer->setAlpha(alpha, mode);
415        layer->setFbo(0);
416        glDeleteTextures(1, &texture);
417        caches.fboCache.put(fbo);
418
419        return status;
420    }
421    return false;
422}
423
424}; // namespace uirenderer
425}; // namespace android
426