static jboolean android_view_HardwareRenderer_preserveBackBuffer(JNIEnv* env, jobject clazz) {
EGLDisplay display = eglGetCurrentDisplay();
EGLSurface surface = eglGetCurrentSurface(EGL_DRAW);
eglGetError();
eglSurfaceAttrib(display, surface, EGL_SWAP_BEHAVIOR, EGL_BUFFER_PRESERVED);
EGLint error = eglGetError();
if (error != EGL_SUCCESS) {
RENDERER_LOGD("Could not enable buffer preserved swap behavior (%x)", error);
}
return error == EGL_SUCCESS;
}
static jboolean android_view_HardwareRenderer_isBackBufferPreserved(JNIEnv* env, jobject clazz) {
EGLDisplay display = eglGetCurrentDisplay();
EGLSurface surface = eglGetCurrentSurface(EGL_DRAW);
EGLint value;
eglGetError();
eglQuerySurface(display, surface, EGL_SWAP_BEHAVIOR, &value);
EGLint error = eglGetError();
if (error != EGL_SUCCESS) {
RENDERER_LOGD("Could not query buffer preserved swap behavior (%x)", error);
}
return error == EGL_SUCCESS && value == EGL_BUFFER_PRESERVED;
}
void DeferredLayerUpdater::doUpdateTexImage() {
if (mSurfaceTexture->updateTexImage() == NO_ERROR) {
float transform[16];
int64_t frameNumber = mSurfaceTexture->getFrameNumber();
// If the GLConsumer queue is in synchronous mode, need to discard all
// but latest frame, using the frame number to tell when we no longer
// have newer frames to target. Since we can't tell which mode it is in,
// do this unconditionally.
int dropCounter = 0;
while (mSurfaceTexture->updateTexImage() == NO_ERROR) {
int64_t newFrameNumber = mSurfaceTexture->getFrameNumber();
if (newFrameNumber == frameNumber) break;
frameNumber = newFrameNumber;
dropCounter++;
}
bool forceFilter = false;
sp<GraphicBuffer> buffer = mSurfaceTexture->getCurrentBuffer();
if (buffer != NULL) {
// force filtration if buffer size != layer size
forceFilter = mWidth != buffer->getWidth()
|| mHeight != buffer->getHeight();
}
#if DEBUG_RENDERER
if (dropCounter > 0) {
RENDERER_LOGD("Dropped %d frames on texture layer update", dropCounter);
}
#endif
mSurfaceTexture->getTransformMatrix(transform);
GLenum renderTarget = mSurfaceTexture->getCurrentTextureTarget();
LayerRenderer::updateTextureLayer(mLayer, mWidth, mHeight,
!mBlend, forceFilter, renderTarget, transform);
}
}
