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      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 #include "DeferredLayerUpdater.h"
     17 
     18 #include "OpenGLRenderer.h"
     19 
     20 #include "LayerRenderer.h"
     21 #include "renderthread/EglManager.h"
     22 #include "renderthread/RenderTask.h"
     23 
     24 namespace android {
     25 namespace uirenderer {
     26 
     27 DeferredLayerUpdater::DeferredLayerUpdater(renderthread::RenderThread& thread, Layer* layer)
     28         : mSurfaceTexture(0)
     29         , mTransform(0)
     30         , mNeedsGLContextAttach(false)
     31         , mUpdateTexImage(false)
     32         , mLayer(layer)
     33         , mCaches(Caches::getInstance())
     34         , mRenderThread(thread) {
     35     mWidth = mLayer->layer.getWidth();
     36     mHeight = mLayer->layer.getHeight();
     37     mBlend = mLayer->isBlend();
     38     mColorFilter = SkSafeRef(mLayer->getColorFilter());
     39     mAlpha = mLayer->getAlpha();
     40     mMode = mLayer->getMode();
     41 }
     42 
     43 DeferredLayerUpdater::~DeferredLayerUpdater() {
     44     SkSafeUnref(mColorFilter);
     45     setTransform(0);
     46     mLayer->postDecStrong();
     47     mLayer = 0;
     48 }
     49 
     50 void DeferredLayerUpdater::setPaint(const SkPaint* paint) {
     51     OpenGLRenderer::getAlphaAndModeDirect(paint, &mAlpha, &mMode);
     52     SkColorFilter* colorFilter = (paint) ? paint->getColorFilter() : NULL;
     53     SkRefCnt_SafeAssign(mColorFilter, colorFilter);
     54 }
     55 
     56 bool DeferredLayerUpdater::apply() {
     57     bool success = true;
     58     // These properties are applied the same to both layer types
     59     mLayer->setColorFilter(mColorFilter);
     60     mLayer->setAlpha(mAlpha, mMode);
     61 
     62     if (mSurfaceTexture.get()) {
     63         if (mNeedsGLContextAttach) {
     64             mNeedsGLContextAttach = false;
     65             mSurfaceTexture->attachToContext(mLayer->getTexture());
     66         }
     67         if (mUpdateTexImage) {
     68             mUpdateTexImage = false;
     69             doUpdateTexImage();
     70         }
     71         if (mTransform) {
     72             mLayer->getTransform().load(*mTransform);
     73             setTransform(0);
     74         }
     75     }
     76     return success;
     77 }
     78 
     79 void DeferredLayerUpdater::doUpdateTexImage() {
     80     if (mSurfaceTexture->updateTexImage() == NO_ERROR) {
     81         float transform[16];
     82 
     83         int64_t frameNumber = mSurfaceTexture->getFrameNumber();
     84         // If the GLConsumer queue is in synchronous mode, need to discard all
     85         // but latest frame, using the frame number to tell when we no longer
     86         // have newer frames to target. Since we can't tell which mode it is in,
     87         // do this unconditionally.
     88         int dropCounter = 0;
     89         while (mSurfaceTexture->updateTexImage() == NO_ERROR) {
     90             int64_t newFrameNumber = mSurfaceTexture->getFrameNumber();
     91             if (newFrameNumber == frameNumber) break;
     92             frameNumber = newFrameNumber;
     93             dropCounter++;
     94         }
     95 
     96         bool forceFilter = false;
     97         sp<GraphicBuffer> buffer = mSurfaceTexture->getCurrentBuffer();
     98         if (buffer != NULL) {
     99             // force filtration if buffer size != layer size
    100             forceFilter = mWidth != buffer->getWidth()
    101                     || mHeight != buffer->getHeight();
    102         }
    103 
    104         #if DEBUG_RENDERER
    105         if (dropCounter > 0) {
    106             RENDERER_LOGD("Dropped %d frames on texture layer update", dropCounter);
    107         }
    108         #endif
    109         mSurfaceTexture->getTransformMatrix(transform);
    110         GLenum renderTarget = mSurfaceTexture->getCurrentTextureTarget();
    111 
    112         LayerRenderer::updateTextureLayer(mLayer, mWidth, mHeight,
    113                 !mBlend, forceFilter, renderTarget, transform);
    114     }
    115 }
    116 
    117 void DeferredLayerUpdater::detachSurfaceTexture() {
    118     if (mSurfaceTexture.get()) {
    119         mRenderThread.eglManager().requireGlContext();
    120         status_t err = mSurfaceTexture->detachFromContext();
    121         if (err != 0) {
    122             // TODO: Elevate to fatal exception
    123             ALOGE("Failed to detach SurfaceTexture from context %d", err);
    124         }
    125         mSurfaceTexture = 0;
    126         mLayer->clearTexture();
    127     }
    128 }
    129 
    130 } /* namespace uirenderer */
    131 } /* namespace android */
    132