142 lines
3.8 KiB
C++
142 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "BasicCanvasLayer.h"
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#include "AsyncCanvasRenderer.h"
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#include "basic/BasicLayers.h" // for BasicLayerManager
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#include "basic/BasicLayersImpl.h" // for GetEffectiveOperator
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#include "mozilla/mozalloc.h" // for operator new
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#include "nsCOMPtr.h" // for already_AddRefed
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#include "nsISupportsImpl.h" // for Layer::AddRef, etc
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#include "gfx2DGlue.h"
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#include "GLScreenBuffer.h"
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#include "GLContext.h"
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#include "gfxUtils.h"
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#include "mozilla/layers/PersistentBufferProvider.h"
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#include "client/TextureClientSharedSurface.h"
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class gfxContext;
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using namespace mozilla::gfx;
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using namespace mozilla::gl;
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namespace mozilla {
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namespace layers {
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already_AddRefed<SourceSurface>
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BasicCanvasLayer::UpdateSurface()
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{
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if (mAsyncRenderer) {
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MOZ_ASSERT(!mBufferProvider);
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MOZ_ASSERT(!mGLContext);
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return mAsyncRenderer->GetSurface();
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}
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if (!mGLContext) {
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return nullptr;
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}
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SharedSurface* frontbuffer = nullptr;
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if (mGLFrontbuffer) {
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frontbuffer = mGLFrontbuffer.get();
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} else {
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GLScreenBuffer* screen = mGLContext->Screen();
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const auto& front = screen->Front();
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if (front) {
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frontbuffer = front->Surf();
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}
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}
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if (!frontbuffer) {
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NS_WARNING("Null frame received.");
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return nullptr;
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}
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IntSize readSize(frontbuffer->mSize);
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SurfaceFormat format = (GetContentFlags() & CONTENT_OPAQUE)
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? SurfaceFormat::B8G8R8X8
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: SurfaceFormat::B8G8R8A8;
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bool needsPremult = frontbuffer->mHasAlpha && !mIsAlphaPremultiplied;
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RefPtr<DataSourceSurface> resultSurf = GetTempSurface(readSize, format);
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// There will already be a warning from inside of GetTempSurface, but
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// it doesn't hurt to complain:
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if (NS_WARN_IF(!resultSurf)) {
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return nullptr;
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}
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// Readback handles Flush/MarkDirty.
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mGLContext->Readback(frontbuffer, resultSurf);
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if (needsPremult) {
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gfxUtils::PremultiplyDataSurface(resultSurf, resultSurf);
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}
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MOZ_ASSERT(resultSurf);
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return resultSurf.forget();
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}
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void
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BasicCanvasLayer::Paint(DrawTarget* aDT,
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const Point& aDeviceOffset,
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Layer* aMaskLayer)
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{
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if (IsHidden())
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return;
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RefPtr<SourceSurface> surface;
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if (IsDirty()) {
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Painted();
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FirePreTransactionCallback();
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surface = UpdateSurface();
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FireDidTransactionCallback();
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}
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bool bufferPoviderSnapshot = false;
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if (!surface && mBufferProvider) {
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surface = mBufferProvider->BorrowSnapshot();
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bufferPoviderSnapshot = !!surface;
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}
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if (!surface) {
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return;
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}
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const bool needsYFlip = (mOriginPos == gl::OriginPos::BottomLeft);
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Matrix oldTM;
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if (needsYFlip) {
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oldTM = aDT->GetTransform();
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aDT->SetTransform(Matrix(oldTM).
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PreTranslate(0.0f, mBounds.height).
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PreScale(1.0f, -1.0f));
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}
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FillRectWithMask(aDT, aDeviceOffset,
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Rect(0, 0, mBounds.width, mBounds.height),
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surface, mSamplingFilter,
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DrawOptions(GetEffectiveOpacity(), GetEffectiveOperator(this)),
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aMaskLayer);
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if (needsYFlip) {
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aDT->SetTransform(oldTM);
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}
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if (bufferPoviderSnapshot) {
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mBufferProvider->ReturnSnapshot(surface.forget());
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}
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}
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already_AddRefed<CanvasLayer>
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BasicLayerManager::CreateCanvasLayer()
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{
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NS_ASSERTION(InConstruction(), "Only allowed in construction phase");
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RefPtr<CanvasLayer> layer = new BasicCanvasLayer(this);
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return layer.forget();
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}
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} // namespace layers
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} // namespace mozilla
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