gecko-dev/gfx/layers/CopyableCanvasRenderer.cpp

200 строки
5.9 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "CopyableCanvasRenderer.h"
#include "BasicLayersImpl.h" // for FillWithMask, etc
#include "GLContext.h" // for GLContext
#include "GLScreenBuffer.h" // for GLScreenBuffer
#include "SharedSurface.h" // for SharedSurface
#include "SharedSurfaceGL.h" // for SharedSurface
#include "gfxPattern.h" // for gfxPattern, etc
#include "gfxPlatform.h" // for gfxPlatform, gfxImageFormat
#include "gfxRect.h" // for gfxRect
#include "gfxUtils.h" // for gfxUtils
#include "gfx2DGlue.h" // for thebes --> moz2d transition
#include "mozilla/gfx/BaseSize.h" // for BaseSize
#include "mozilla/gfx/Tools.h"
#include "mozilla/gfx/Point.h" // for IntSize
#include "mozilla/layers/AsyncCanvasRenderer.h"
#include "mozilla/layers/PersistentBufferProvider.h"
#include "nsDebug.h" // for NS_ASSERTION, NS_WARNING, etc
#include "nsISupportsImpl.h" // for gfxContext::AddRef, etc
#include "nsRect.h" // for mozilla::gfx::IntRect
#include "gfxUtils.h"
#include "client/TextureClientSharedSurface.h"
namespace mozilla {
namespace layers {
using namespace mozilla::gfx;
using namespace mozilla::gl;
CopyableCanvasRenderer::CopyableCanvasRenderer()
: mGLContext(nullptr)
, mBufferProvider(nullptr)
, mGLFrontbuffer(nullptr)
, mAsyncRenderer(nullptr)
, mIsAlphaPremultiplied(true)
, mOriginPos(gl::OriginPos::TopLeft)
, mOpaque(true)
, mCachedTempSurface(nullptr)
{
MOZ_COUNT_CTOR(CopyableCanvasRenderer);
}
CopyableCanvasRenderer::~CopyableCanvasRenderer()
{
Destroy();
MOZ_COUNT_DTOR(CopyableCanvasRenderer);
}
void
CopyableCanvasRenderer::Initialize(const CanvasInitializeData& aData)
{
CanvasRenderer::Initialize(aData);
if (aData.mGLContext) {
mGLContext = aData.mGLContext;
mIsAlphaPremultiplied = aData.mIsGLAlphaPremult;
mOriginPos = gl::OriginPos::BottomLeft;
MOZ_ASSERT(mGLContext->IsOffscreen(), "canvas gl context isn't offscreen");
if (aData.mFrontbufferGLTex) {
gfx::IntSize size(aData.mSize.width, aData.mSize.height);
mGLFrontbuffer = SharedSurface_Basic::Wrap(aData.mGLContext, size, aData.mHasAlpha,
aData.mFrontbufferGLTex);
mBufferProvider = aData.mBufferProvider;
}
} else if (aData.mBufferProvider) {
mBufferProvider = aData.mBufferProvider;
} else if (aData.mRenderer) {
mAsyncRenderer = aData.mRenderer;
mOriginPos = gl::OriginPos::BottomLeft;
} else {
MOZ_CRASH("GFX: CanvasRenderer created without BufferProvider, DrawTarget or GLContext?");
}
mOpaque = !aData.mHasAlpha;
}
bool
CopyableCanvasRenderer::IsDataValid(const CanvasInitializeData& aData)
{
return mGLContext == aData.mGLContext;
}
void
CopyableCanvasRenderer::ClearCachedResources()
{
if (mBufferProvider) {
mBufferProvider->ClearCachedResources();
}
mCachedTempSurface = nullptr;
}
void
CopyableCanvasRenderer::Destroy()
{
if (mBufferProvider) {
mBufferProvider->ClearCachedResources();
}
mBufferProvider = nullptr;
mCachedTempSurface = nullptr;
}
already_AddRefed<SourceSurface>
CopyableCanvasRenderer::ReadbackSurface()
{
struct ScopedFireTransactionCallback {
explicit ScopedFireTransactionCallback(CopyableCanvasRenderer* aRenderer)
: mRenderer(aRenderer)
{
mRenderer->FirePreTransactionCallback();
}
~ScopedFireTransactionCallback()
{
mRenderer->FireDidTransactionCallback();
}
CopyableCanvasRenderer* mRenderer;
};
ScopedFireTransactionCallback callback(this);
if (mAsyncRenderer) {
MOZ_ASSERT(!mBufferProvider);
MOZ_ASSERT(!mGLContext);
return mAsyncRenderer->GetSurface();
}
if (!mGLContext) {
return nullptr;
}
SharedSurface* frontbuffer = nullptr;
if (mGLFrontbuffer) {
frontbuffer = mGLFrontbuffer.get();
} else {
GLScreenBuffer* screen = mGLContext->Screen();
const auto& front = screen->Front();
if (front) {
frontbuffer = front->Surf();
}
}
if (!frontbuffer) {
NS_WARNING("Null frame received.");
return nullptr;
}
IntSize readSize(frontbuffer->mSize);
SurfaceFormat format = frontbuffer->mHasAlpha ? SurfaceFormat::B8G8R8A8
: SurfaceFormat::B8G8R8X8;
bool needsPremult = frontbuffer->mHasAlpha && !mIsAlphaPremultiplied;
RefPtr<DataSourceSurface> resultSurf = GetTempSurface(readSize, format);
// There will already be a warning from inside of GetTempSurface, but
// it doesn't hurt to complain:
if (NS_WARN_IF(!resultSurf)) {
return nullptr;
}
// Readback handles Flush/MarkDirty.
if (!mGLContext->Readback(frontbuffer, resultSurf)) {
NS_WARNING("Failed to read back canvas surface.");
return nullptr;
}
if (needsPremult) {
gfxUtils::PremultiplyDataSurface(resultSurf, resultSurf);
}
MOZ_ASSERT(resultSurf);
return resultSurf.forget();
}
DataSourceSurface*
CopyableCanvasRenderer::GetTempSurface(const IntSize& aSize,
const SurfaceFormat aFormat)
{
if (!mCachedTempSurface ||
aSize != mCachedTempSurface->GetSize() ||
aFormat != mCachedTempSurface->GetFormat())
{
// Create a surface aligned to 8 bytes since that's the highest alignment WebGL can handle.
uint32_t stride = GetAlignedStride<8>(aSize.width, BytesPerPixel(aFormat));
mCachedTempSurface = Factory::CreateDataSourceSurfaceWithStride(aSize, aFormat, stride);
}
return mCachedTempSurface;
}
} // namespace layers
} // namespace mozilla