Layer.cpp revision 90d0c75e94a32fb7d993fae69762820aabc2fcbb 
1/*
2 * Copyright (C) 2012 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 <utils/Log.h>
20
21#include "DisplayList.h"
22#include "DeferredDisplayList.h"
23#include "Layer.h"
24#include "LayerRenderer.h"
25#include "OpenGLRenderer.h"
26#include "Caches.h"
27
28namespace android {
29namespace uirenderer {
30
31Layer::Layer(const uint32_t layerWidth, const uint32_t layerHeight):
32        caches(Caches::getInstance()), texture(caches) {
33    mesh = NULL;
34    meshElementCount = 0;
35    cacheable = true;
36    dirty = false;
37    textureLayer = false;
38    renderTarget = GL_TEXTURE_2D;
39    texture.width = layerWidth;
40    texture.height = layerHeight;
41    colorFilter = NULL;
42    deferredUpdateScheduled = false;
43    renderer = NULL;
44    displayList = NULL;
45    fbo = 0;
46    stencil = NULL;
47    debugDrawUpdate = false;
48    hasDrawnSinceUpdate = false;
49    deferredList = NULL;
50    caches.resourceCache.incrementRefcount(this);
51}
52
53Layer::~Layer() {
54    SkSafeUnref(colorFilter);
55    removeFbo();
56    deleteTexture();
57
58    delete[] mesh;
59    delete deferredList;
60}
61
62uint32_t Layer::computeIdealWidth(uint32_t layerWidth) {
63    return uint32_t(ceilf(layerWidth / float(LAYER_SIZE)) * LAYER_SIZE);
64}
65
66uint32_t Layer::computeIdealHeight(uint32_t layerHeight) {
67    return uint32_t(ceilf(layerHeight / float(LAYER_SIZE)) * LAYER_SIZE);
68}
69
70bool Layer::resize(const uint32_t width, const uint32_t height) {
71    uint32_t desiredWidth = computeIdealWidth(width);
72    uint32_t desiredHeight = computeIdealWidth(height);
73
74    if (desiredWidth <= getWidth() && desiredHeight <= getHeight()) {
75        return true;
76    }
77
78    const uint32_t maxTextureSize = caches.maxTextureSize;
79    if (desiredWidth > maxTextureSize || desiredHeight > maxTextureSize) {
80        ALOGW("Layer exceeds max. dimensions supported by the GPU (%dx%d, max=%dx%d)",
81                desiredWidth, desiredHeight, maxTextureSize, maxTextureSize);
82        return false;
83    }
84
85    uint32_t oldWidth = getWidth();
86    uint32_t oldHeight = getHeight();
87
88    setSize(desiredWidth, desiredHeight);
89
90    if (fbo) {
91        caches.activeTexture(0);
92        bindTexture();
93        allocateTexture();
94
95        if (glGetError() != GL_NO_ERROR) {
96            setSize(oldWidth, oldHeight);
97            return false;
98        }
99    }
100
101    if (stencil) {
102        stencil->bind();
103        stencil->resize(desiredWidth, desiredHeight);
104
105        if (glGetError() != GL_NO_ERROR) {
106            setSize(oldWidth, oldHeight);
107            return false;
108        }
109    }
110
111    return true;
112}
113
114void Layer::removeFbo(bool flush) {
115    if (stencil) {
116        GLuint previousFbo;
117        glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
118        if (fbo != previousFbo) glBindFramebuffer(GL_FRAMEBUFFER, fbo);
119        glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, 0);
120        if (fbo != previousFbo) glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
121
122        caches.renderBufferCache.put(stencil);
123        stencil = NULL;
124    }
125
126    if (fbo) {
127        if (flush) LayerRenderer::flushLayer(this);
128        // If put fails the cache will delete the FBO
129        caches.fboCache.put(fbo);
130        fbo = 0;
131    }
132}
133
134void Layer::setPaint(SkPaint* paint) {
135    OpenGLRenderer::getAlphaAndModeDirect(paint, &alpha, &mode);
136}
137
138void Layer::setColorFilter(SkColorFilter* filter) {
139    SkRefCnt_SafeAssign(colorFilter, filter);
140}
141
142void Layer::bindTexture() const {
143    if (texture.id) {
144        caches.bindTexture(renderTarget, texture.id);
145    }
146}
147
148void Layer::bindStencilRenderBuffer() const {
149    if (stencil) {
150        stencil->bind();
151    }
152}
153
154void Layer::generateTexture() {
155    if (!texture.id) {
156        glGenTextures(1, &texture.id);
157    }
158}
159
160void Layer::deleteTexture() {
161    if (texture.id) {
162        texture.deleteTexture();
163        texture.id = 0;
164    }
165}
166
167void Layer::clearTexture() {
168    texture.id = 0;
169}
170
171void Layer::allocateTexture() {
172#if DEBUG_LAYERS
173    ALOGD("  Allocate layer: %dx%d", getWidth(), getHeight());
174#endif
175    if (texture.id) {
176        glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
177        glTexImage2D(renderTarget, 0, GL_RGBA, getWidth(), getHeight(), 0,
178                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
179    }
180}
181
182void Layer::defer() {
183    const float width = layer.getWidth();
184    const float height = layer.getHeight();
185
186    if (dirtyRect.isEmpty() || (dirtyRect.left <= 0 && dirtyRect.top <= 0 &&
187            dirtyRect.right >= width && dirtyRect.bottom >= height)) {
188        dirtyRect.set(0, 0, width, height);
189    }
190
191    delete deferredList;
192    deferredList = new DeferredDisplayList(dirtyRect);
193
194    DeferStateStruct deferredState(*deferredList, *renderer,
195            DisplayList::kReplayFlag_ClipChildren);
196
197    renderer->initViewport(width, height);
198    renderer->setupFrameState(dirtyRect.left, dirtyRect.top,
199            dirtyRect.right, dirtyRect.bottom, !isBlend());
200
201    displayList->computeOrdering();
202    displayList->defer(deferredState, 0);
203
204    deferredUpdateScheduled = false;
205}
206
207void Layer::cancelDefer() {
208    renderer = NULL;
209    displayList = NULL;
210    deferredUpdateScheduled = false;
211    if (deferredList) {
212        delete deferredList;
213        deferredList = NULL;
214    }
215}
216
217void Layer::flush() {
218    // renderer is checked as layer may be destroyed/put in layer cache with flush scheduled
219    if (deferredList && renderer) {
220        renderer->setViewport(layer.getWidth(), layer.getHeight());
221        renderer->prepareDirty(dirtyRect.left, dirtyRect.top, dirtyRect.right, dirtyRect.bottom,
222                !isBlend());
223
224        deferredList->flush(*renderer, dirtyRect);
225
226        renderer->finish();
227        renderer = NULL;
228
229        dirtyRect.setEmpty();
230        displayList = NULL;
231    }
232}
233
234void Layer::render() {
235    renderer->setViewport(layer.getWidth(), layer.getHeight());
236    renderer->prepareDirty(dirtyRect.left, dirtyRect.top, dirtyRect.right, dirtyRect.bottom,
237            !isBlend());
238
239    renderer->drawDisplayList(displayList, dirtyRect, DisplayList::kReplayFlag_ClipChildren);
240
241    renderer->finish();
242    renderer = NULL;
243
244    dirtyRect.setEmpty();
245
246    deferredUpdateScheduled = false;
247    displayList = NULL;
248}
249
250}; // namespace uirenderer
251}; // namespace android
252