Error HWUISink::draw(const Src& src, SkBitmap* dst, SkWStream*, SkString*) const {
// Do all setup in this function because we don't know the size
// for the RenderNode and RenderProxy during the constructor.
// In practice this doesn't seem too expensive.
const SkISize size = src.size();
// Based on android::SurfaceTexture_init()
android::sp<android::IGraphicBufferProducer> producer;
android::sp<android::IGraphicBufferConsumer> consumer;
android::BufferQueue::createBufferQueue(&producer, &consumer);
// Consumer setup
android::sp<android::CpuConsumer> cpuConsumer =
new android::CpuConsumer(consumer, 1);
cpuConsumer->setName(android::String8("SkiaTestClient"));
cpuConsumer->setDefaultBufferSize(size.width(), size.height());
// Producer setup
android::sp<android::Surface> surface = new android::Surface(producer);
native_window_set_buffers_dimensions(surface.get(), size.width(), size.height());
native_window_set_buffers_format(surface.get(), android::PIXEL_FORMAT_RGBA_8888);
native_window_set_usage(surface.get(), GRALLOC_USAGE_SW_READ_OFTEN |
GRALLOC_USAGE_SW_WRITE_NEVER |
GRALLOC_USAGE_HW_RENDER);
// RenderNode setup based on hwui/tests/main.cpp:TreeContentAnimation
SkAutoTDelete<android::uirenderer::RenderNode> rootNode
(new android::uirenderer::RenderNode());
rootNode->incStrong(nullptr);
// Values set here won't be applied until the framework has called
// RenderNode::pushStagingPropertiesChanges() during RenderProxy::syncAndDrawFrame().
rootNode->mutateStagingProperties().setLeftTopRightBottom(0, 0, size.width(), size.height());
rootNode->setPropertyFieldsDirty(android::uirenderer::RenderNode::X |
android::uirenderer::RenderNode::Y);
rootNode->mutateStagingProperties().setClipToBounds(false);
rootNode->setPropertyFieldsDirty(android::uirenderer::RenderNode::GENERIC);
// RenderProxy setup based on hwui/tests/main.cpp:TreeContentAnimation
ContextFactory factory;
SkAutoTDelete<android::uirenderer::renderthread::RenderProxy> proxy
(new android::uirenderer::renderthread::RenderProxy(false, rootNode, &factory));
proxy->loadSystemProperties();
proxy->initialize(surface.get());
float lightX = size.width() / 2.0f;
android::uirenderer::Vector3 lightVector { lightX, dp(-200.0f), dp(800.0f) };
proxy->setup(size.width(), size.height(), lightVector, dp(800.0f), 255 * 0.075f, 255 * 0.15f,
kDensity);
// Do the draw
SkAutoTDelete<android::uirenderer::DisplayListRenderer> renderer
(new android::uirenderer::DisplayListRenderer());
renderer->setViewport(size.width(), size.height());
renderer->prepare();
renderer->clipRect(0, 0, size.width(), size.height(), SkRegion::Op::kReplace_Op);
Error err = src.draw(renderer->asSkCanvas());
if (!err.isEmpty()) {
return err;
}
renderer->finish();
rootNode->setStagingDisplayList(renderer->finishRecording());
proxy->syncAndDrawFrame();
proxy->fence();
// Capture pixels
SkImageInfo destinationConfig =
SkImageInfo::Make(size.width(), size.height(),
kRGBA_8888_SkColorType, kPremul_SkAlphaType);
dst->allocPixels(destinationConfig);
sk_memset32((uint32_t*) dst->getPixels(), SK_ColorRED, size.width() * size.height());
android::CpuConsumer::LockedBuffer nativeBuffer;
android::status_t retval = cpuConsumer->lockNextBuffer(&nativeBuffer);
if (retval == android::BAD_VALUE) {
SkDebugf("HWUISink::draw() got no buffer; returning transparent");
// No buffer ready to read - commonly triggered by dm sending us
// a no-op source, or calling code that doesn't do anything on this
// backend.
dst->eraseColor(SK_ColorTRANSPARENT);
return "";
} else if (retval) {
return SkStringPrintf("Failed to lock buffer to read pixels: %d.", retval);
}
// Move the pixels into the destination SkBitmap
SK_ALWAYSBREAK(nativeBuffer.format == android::PIXEL_FORMAT_RGBA_8888 &&
"Native buffer not RGBA!");
SkImageInfo nativeConfig =
SkImageInfo::Make(nativeBuffer.width, nativeBuffer.height,
kRGBA_8888_SkColorType, kPremul_SkAlphaType);
// Android stride is in pixels, Skia stride is in bytes
SkBitmap nativeWrapper;
bool success =
nativeWrapper.installPixels(nativeConfig, nativeBuffer.data, nativeBuffer.stride * 4);
if (!success) {
return "Failed to wrap HWUI buffer in a SkBitmap";
}
SK_ALWAYSBREAK(dst->colorType() == kRGBA_8888_SkColorType &&
"Destination buffer not RGBA!");
success =
nativeWrapper.readPixels(destinationConfig, dst->getPixels(), dst->rowBytes(), 0, 0);
if (!success) {
return "Failed to extract pixels from HWUI buffer";
}
cpuConsumer->unlockBuffer(nativeBuffer);
return "";
}
