CanvasContext.cpp revision dbc9a86d05e5e835051de22f6cb30ec1921e9705 
1/*
2 * Copyright (C) 2014 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 "CanvasContext"
18
19#include "CanvasContext.h"
20
21#include <cutils/properties.h>
22#include <private/hwui/DrawGlInfo.h>
23#include <strings.h>
24
25#include "RenderThread.h"
26#include "../Caches.h"
27#include "../DeferredLayerUpdater.h"
28#include "../LayerRenderer.h"
29#include "../OpenGLRenderer.h"
30#include "../Stencil.h"
31
32#define PROPERTY_RENDER_DIRTY_REGIONS "debug.hwui.render_dirty_regions"
33#define GLES_VERSION 2
34
35#ifdef USE_OPENGL_RENDERER
36// Android-specific addition that is used to show when frames began in systrace
37EGLAPI void EGLAPIENTRY eglBeginFrame(EGLDisplay dpy, EGLSurface surface);
38#endif
39
40namespace android {
41namespace uirenderer {
42namespace renderthread {
43
44#define ERROR_CASE(x) case x: return #x;
45static const char* egl_error_str(EGLint error) {
46    switch (error) {
47        ERROR_CASE(EGL_SUCCESS)
48        ERROR_CASE(EGL_NOT_INITIALIZED)
49        ERROR_CASE(EGL_BAD_ACCESS)
50        ERROR_CASE(EGL_BAD_ALLOC)
51        ERROR_CASE(EGL_BAD_ATTRIBUTE)
52        ERROR_CASE(EGL_BAD_CONFIG)
53        ERROR_CASE(EGL_BAD_CONTEXT)
54        ERROR_CASE(EGL_BAD_CURRENT_SURFACE)
55        ERROR_CASE(EGL_BAD_DISPLAY)
56        ERROR_CASE(EGL_BAD_MATCH)
57        ERROR_CASE(EGL_BAD_NATIVE_PIXMAP)
58        ERROR_CASE(EGL_BAD_NATIVE_WINDOW)
59        ERROR_CASE(EGL_BAD_PARAMETER)
60        ERROR_CASE(EGL_BAD_SURFACE)
61        ERROR_CASE(EGL_CONTEXT_LOST)
62    default:
63        return "Unknown error";
64    }
65}
66static const char* egl_error_str() {
67    return egl_error_str(eglGetError());
68}
69
70static bool load_dirty_regions_property() {
71    char buf[PROPERTY_VALUE_MAX];
72    int len = property_get(PROPERTY_RENDER_DIRTY_REGIONS, buf, "true");
73    return !strncasecmp("true", buf, len);
74}
75
76// This class contains the shared global EGL objects, such as EGLDisplay
77// and EGLConfig, which are re-used by CanvasContext
78class GlobalContext {
79public:
80    static GlobalContext* get();
81
82    // Returns true on success, false on failure
83    void initialize();
84
85    bool hasContext();
86
87    void usePBufferSurface();
88    EGLSurface createSurface(EGLNativeWindowType window);
89    void destroySurface(EGLSurface surface);
90
91    void destroy();
92
93    bool isCurrent(EGLSurface surface) { return mCurrentSurface == surface; }
94    // Returns true if the current surface changed, false if it was already current
95    bool makeCurrent(EGLSurface surface);
96    void beginFrame(EGLSurface surface, EGLint* width, EGLint* height);
97    void swapBuffers(EGLSurface surface);
98
99    bool enableDirtyRegions(EGLSurface surface);
100
101private:
102    GlobalContext();
103    // GlobalContext is never destroyed, method is purposely not implemented
104    ~GlobalContext();
105
106    void loadConfig();
107    void createContext();
108    void initAtlas();
109
110    static GlobalContext* sContext;
111
112    EGLDisplay mEglDisplay;
113    EGLConfig mEglConfig;
114    EGLContext mEglContext;
115    EGLSurface mPBufferSurface;
116
117    const bool mRequestDirtyRegions;
118    bool mCanSetDirtyRegions;
119
120    EGLSurface mCurrentSurface;
121};
122
123GlobalContext* GlobalContext::sContext = 0;
124
125GlobalContext* GlobalContext::get() {
126    if (!sContext) {
127        sContext = new GlobalContext();
128    }
129    return sContext;
130}
131
132GlobalContext::GlobalContext()
133        : mEglDisplay(EGL_NO_DISPLAY)
134        , mEglConfig(0)
135        , mEglContext(EGL_NO_CONTEXT)
136        , mPBufferSurface(EGL_NO_SURFACE)
137        , mRequestDirtyRegions(load_dirty_regions_property())
138        , mCurrentSurface(EGL_NO_SURFACE) {
139    mCanSetDirtyRegions = mRequestDirtyRegions;
140    ALOGD("Render dirty regions requested: %s", mRequestDirtyRegions ? "true" : "false");
141}
142
143void GlobalContext::initialize() {
144    if (hasContext()) return;
145
146    mEglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
147    LOG_ALWAYS_FATAL_IF(mEglDisplay == EGL_NO_DISPLAY,
148            "Failed to get EGL_DEFAULT_DISPLAY! err=%s", egl_error_str());
149
150    EGLint major, minor;
151    LOG_ALWAYS_FATAL_IF(eglInitialize(mEglDisplay, &major, &minor) == EGL_FALSE,
152            "Failed to initialize display %p! err=%s", mEglDisplay, egl_error_str());
153
154    ALOGI("Initialized EGL, version %d.%d", (int)major, (int)minor);
155
156    loadConfig();
157    createContext();
158    usePBufferSurface();
159    Caches::getInstance().init();
160    initAtlas();
161}
162
163bool GlobalContext::hasContext() {
164    return mEglDisplay != EGL_NO_DISPLAY;
165}
166
167void GlobalContext::loadConfig() {
168    EGLint swapBehavior = mCanSetDirtyRegions ? EGL_SWAP_BEHAVIOR_PRESERVED_BIT : 0;
169    EGLint attribs[] = {
170            EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
171            EGL_RED_SIZE, 8,
172            EGL_GREEN_SIZE, 8,
173            EGL_BLUE_SIZE, 8,
174            EGL_ALPHA_SIZE, 8,
175            EGL_DEPTH_SIZE, 0,
176            EGL_CONFIG_CAVEAT, EGL_NONE,
177            EGL_STENCIL_SIZE, Stencil::getStencilSize(),
178            EGL_SURFACE_TYPE, EGL_WINDOW_BIT | swapBehavior,
179            EGL_NONE
180    };
181
182    EGLint num_configs = 1;
183    if (!eglChooseConfig(mEglDisplay, attribs, &mEglConfig, num_configs, &num_configs)
184            || num_configs != 1) {
185        // Failed to get a valid config
186        if (mCanSetDirtyRegions) {
187            ALOGW("Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...");
188            // Try again without dirty regions enabled
189            mCanSetDirtyRegions = false;
190            loadConfig();
191        } else {
192            LOG_ALWAYS_FATAL("Failed to choose config, error = %s", egl_error_str());
193        }
194    }
195}
196
197void GlobalContext::createContext() {
198    EGLint attribs[] = { EGL_CONTEXT_CLIENT_VERSION, GLES_VERSION, EGL_NONE };
199    mEglContext = eglCreateContext(mEglDisplay, mEglConfig, EGL_NO_CONTEXT, attribs);
200    LOG_ALWAYS_FATAL_IF(mEglContext == EGL_NO_CONTEXT,
201        "Failed to create context, error = %s", egl_error_str());
202}
203
204void GlobalContext::initAtlas() {
205    // TODO implement
206    // For now just run without an atlas
207}
208
209void GlobalContext::usePBufferSurface() {
210    LOG_ALWAYS_FATAL_IF(mEglDisplay == EGL_NO_DISPLAY,
211            "usePBufferSurface() called on uninitialized GlobalContext!");
212
213    if (mPBufferSurface == EGL_NO_SURFACE) {
214        EGLint attribs[] = { EGL_WIDTH, 1, EGL_HEIGHT, 1, EGL_NONE };
215        mPBufferSurface = eglCreatePbufferSurface(mEglDisplay, mEglConfig, attribs);
216    }
217    makeCurrent(mPBufferSurface);
218}
219
220EGLSurface GlobalContext::createSurface(EGLNativeWindowType window) {
221    initialize();
222    return eglCreateWindowSurface(mEglDisplay, mEglConfig, window, NULL);
223}
224
225void GlobalContext::destroySurface(EGLSurface surface) {
226    if (isCurrent(surface)) {
227        makeCurrent(EGL_NO_SURFACE);
228    }
229    if (!eglDestroySurface(mEglDisplay, surface)) {
230        ALOGW("Failed to destroy surface %p, error=%s", (void*)surface, egl_error_str());
231    }
232}
233
234void GlobalContext::destroy() {
235    if (mEglDisplay == EGL_NO_DISPLAY) return;
236
237    usePBufferSurface();
238    if (Caches::hasInstance()) {
239        Caches::getInstance().terminate();
240    }
241
242    eglDestroyContext(mEglDisplay, mEglContext);
243    eglDestroySurface(mEglDisplay, mPBufferSurface);
244    eglMakeCurrent(mEglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
245    eglTerminate(mEglDisplay);
246    eglReleaseThread();
247
248    mEglDisplay = EGL_NO_DISPLAY;
249    mEglContext = EGL_NO_CONTEXT;
250    mPBufferSurface = EGL_NO_SURFACE;
251    mCurrentSurface = EGL_NO_SURFACE;
252}
253
254bool GlobalContext::makeCurrent(EGLSurface surface) {
255    if (isCurrent(surface)) return false;
256
257    if (surface == EGL_NO_SURFACE) {
258        // If we are setting EGL_NO_SURFACE we don't care about any of the potential
259        // return errors, which would only happen if mEglDisplay had already been
260        // destroyed in which case the current context is already NO_CONTEXT
261        eglMakeCurrent(mEglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
262    } else if (!eglMakeCurrent(mEglDisplay, surface, surface, mEglContext)) {
263        LOG_ALWAYS_FATAL("Failed to make current on surface %p, error=%s",
264                (void*)surface, egl_error_str());
265    }
266    mCurrentSurface = surface;
267    return true;
268}
269
270void GlobalContext::beginFrame(EGLSurface surface, EGLint* width, EGLint* height) {
271    LOG_ALWAYS_FATAL_IF(surface == EGL_NO_SURFACE,
272            "Tried to beginFrame on EGL_NO_SURFACE!");
273    makeCurrent(surface);
274    if (width) {
275        eglQuerySurface(mEglDisplay, surface, EGL_WIDTH, width);
276    }
277    if (height) {
278        eglQuerySurface(mEglDisplay, surface, EGL_HEIGHT, height);
279    }
280    eglBeginFrame(mEglDisplay, surface);
281}
282
283void GlobalContext::swapBuffers(EGLSurface surface) {
284    eglSwapBuffers(mEglDisplay, surface);
285    EGLint err = eglGetError();
286    LOG_ALWAYS_FATAL_IF(err != EGL_SUCCESS,
287            "Encountered EGL error %d %s during rendering", err, egl_error_str(err));
288}
289
290bool GlobalContext::enableDirtyRegions(EGLSurface surface) {
291    if (!mRequestDirtyRegions) return false;
292
293    if (mCanSetDirtyRegions) {
294        if (!eglSurfaceAttrib(mEglDisplay, surface, EGL_SWAP_BEHAVIOR, EGL_BUFFER_PRESERVED)) {
295            ALOGW("Failed to set EGL_SWAP_BEHAVIOR on surface %p, error=%s",
296                    (void*) surface, egl_error_str());
297            return false;
298        }
299        return true;
300    }
301    // Perhaps it is already enabled?
302    EGLint value;
303    if (!eglQuerySurface(mEglDisplay, surface, EGL_SWAP_BEHAVIOR, &value)) {
304        ALOGW("Failed to query EGL_SWAP_BEHAVIOR on surface %p, error=%p",
305                (void*) surface, egl_error_str());
306        return false;
307    }
308    return value == EGL_BUFFER_PRESERVED;
309}
310
311CanvasContext::CanvasContext(bool translucent)
312        : mRenderThread(RenderThread::getInstance())
313        , mEglSurface(EGL_NO_SURFACE)
314        , mDirtyRegionsEnabled(false)
315        , mOpaque(!translucent)
316        , mCanvas(0)
317        , mHaveNewSurface(false) {
318    mGlobalContext = GlobalContext::get();
319}
320
321CanvasContext::~CanvasContext() {
322    destroyCanvasAndSurface();
323}
324
325void CanvasContext::destroyCanvasAndSurface() {
326    if (mCanvas) {
327        delete mCanvas;
328        mCanvas = 0;
329    }
330    setSurface(NULL);
331}
332
333void CanvasContext::setSurface(EGLNativeWindowType window) {
334    if (mEglSurface != EGL_NO_SURFACE) {
335        mGlobalContext->destroySurface(mEglSurface);
336        mEglSurface = EGL_NO_SURFACE;
337    }
338
339    if (window) {
340        mEglSurface = mGlobalContext->createSurface(window);
341        LOG_ALWAYS_FATAL_IF(mEglSurface == EGL_NO_SURFACE,
342                "Failed to create EGLSurface for window %p, eglErr = %s",
343                (void*) window, egl_error_str());
344    }
345
346    if (mEglSurface != EGL_NO_SURFACE) {
347        mDirtyRegionsEnabled = mGlobalContext->enableDirtyRegions(mEglSurface);
348        mHaveNewSurface = true;
349        makeCurrent();
350    }
351}
352
353void CanvasContext::swapBuffers() {
354    mGlobalContext->swapBuffers(mEglSurface);
355    mHaveNewSurface = false;
356}
357
358void CanvasContext::requireSurface() {
359    LOG_ALWAYS_FATAL_IF(mEglSurface == EGL_NO_SURFACE,
360            "requireSurface() called but no surface set!");
361    makeCurrent();
362}
363
364bool CanvasContext::initialize(EGLNativeWindowType window) {
365    if (mCanvas) return false;
366    setSurface(window);
367    mCanvas = new OpenGLRenderer();
368    mCanvas->initProperties();
369    return true;
370}
371
372void CanvasContext::updateSurface(EGLNativeWindowType window) {
373    setSurface(window);
374}
375
376void CanvasContext::pauseSurface(EGLNativeWindowType window) {
377    // TODO: For now we just need a fence, in the future suspend any animations
378    // and such to prevent from trying to render into this surface
379}
380
381void CanvasContext::setup(int width, int height) {
382    if (!mCanvas) return;
383    mCanvas->setViewport(width, height);
384}
385
386void CanvasContext::makeCurrent() {
387    // TODO: Figure out why this workaround is needed, see b/13913604
388    // In the meantime this matches the behavior of GLRenderer, so it is not a regression
389    mHaveNewSurface |= mGlobalContext->makeCurrent(mEglSurface);
390}
391
392void CanvasContext::processLayerUpdates(const Vector<DeferredLayerUpdater*>* layerUpdaters,
393        TreeInfo& info) {
394    LOG_ALWAYS_FATAL_IF(!mCanvas, "Cannot process layer updates without a canvas!");
395    makeCurrent();
396    for (size_t i = 0; i < layerUpdaters->size(); i++) {
397        DeferredLayerUpdater* update = layerUpdaters->itemAt(i);
398        bool success = update->apply(info);
399        LOG_ALWAYS_FATAL_IF(!success, "Failed to update layer!");
400        if (update->backingLayer()->deferredUpdateScheduled) {
401            mCanvas->pushLayerUpdate(update->backingLayer());
402        }
403    }
404}
405
406void CanvasContext::drawDisplayList(RenderNode* displayList, Rect* dirty) {
407    LOG_ALWAYS_FATAL_IF(!mCanvas || mEglSurface == EGL_NO_SURFACE,
408            "drawDisplayList called on a context with no canvas or surface!");
409
410    EGLint width, height;
411    mGlobalContext->beginFrame(mEglSurface, &width, &height);
412    if (width != mCanvas->getViewportWidth() || height != mCanvas->getViewportHeight()) {
413        mCanvas->setViewport(width, height);
414        dirty = NULL;
415    } else if (!mDirtyRegionsEnabled || mHaveNewSurface) {
416        dirty = NULL;
417    }
418
419    status_t status;
420    if (dirty) {
421        status = mCanvas->prepareDirty(dirty->left, dirty->top,
422                dirty->right, dirty->bottom, mOpaque);
423    } else {
424        status = mCanvas->prepare(mOpaque);
425    }
426
427    Rect outBounds;
428    status |= mCanvas->drawDisplayList(displayList, outBounds);
429
430    // TODO: Draw debug info
431    // TODO: Performance tracking
432
433    mCanvas->finish();
434
435    if (status & DrawGlInfo::kStatusDrew) {
436        swapBuffers();
437    }
438}
439
440void CanvasContext::invokeFunctor(Functor* functor) {
441    ATRACE_CALL();
442    DrawGlInfo::Mode mode = DrawGlInfo::kModeProcessNoContext;
443    if (mGlobalContext->hasContext()) {
444        requireGlContext();
445        mode = DrawGlInfo::kModeProcess;
446    }
447    // TODO: Remove the dummy info in the future
448    DrawGlInfo dummyInfo;
449    memset(&dummyInfo, 0, sizeof(DrawGlInfo));
450    (*functor)(mode, &dummyInfo);
451
452    if (mCanvas) {
453        mCanvas->resume();
454    }
455}
456
457bool CanvasContext::copyLayerInto(DeferredLayerUpdater* layer, SkBitmap* bitmap) {
458    requireGlContext();
459    TreeInfo info;
460    layer->apply(info);
461    return LayerRenderer::copyLayer(layer->backingLayer(), bitmap);
462}
463
464void CanvasContext::runWithGlContext(RenderTask* task) {
465    requireGlContext();
466    task->run();
467}
468
469Layer* CanvasContext::createRenderLayer(int width, int height) {
470    requireSurface();
471    return LayerRenderer::createRenderLayer(width, height);
472}
473
474Layer* CanvasContext::createTextureLayer() {
475    requireSurface();
476    return LayerRenderer::createTextureLayer();
477}
478
479void CanvasContext::requireGlContext() {
480    if (mEglSurface != EGL_NO_SURFACE) {
481        makeCurrent();
482    } else {
483        mGlobalContext->usePBufferSurface();
484    }
485}
486
487} /* namespace renderthread */
488} /* namespace uirenderer */
489} /* namespace android */
490