gecko/gfx/layers/CopyableCanvasLayer.cpp

221 lines
6.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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 "mozilla/layers/PLayerTransactionParent.h"
#include "CopyableCanvasLayer.h"
#include "BasicLayersImpl.h"
#include "gfxImageSurface.h"
#include "GLContext.h"
#include "gfxUtils.h"
#include "gfxPlatform.h"
#include "mozilla/Preferences.h"
#include "SurfaceStream.h"
#include "SharedSurfaceGL.h"
#include "SharedSurfaceEGL.h"
#include "GeckoProfiler.h"
#include "nsXULAppAPI.h"
using namespace mozilla::gfx;
using namespace mozilla::gl;
namespace mozilla {
namespace layers {
void
CopyableCanvasLayer::Initialize(const Data& aData)
{
NS_ASSERTION(mSurface == nullptr, "BasicCanvasLayer::Initialize called twice!");
if (aData.mSurface) {
mSurface = aData.mSurface;
NS_ASSERTION(!aData.mGLContext, "CanvasLayer can't have both surface and GLContext");
mNeedsYFlip = false;
} else if (aData.mGLContext) {
mGLContext = aData.mGLContext;
mIsGLAlphaPremult = aData.mIsGLAlphaPremult;
mNeedsYFlip = true;
MOZ_ASSERT(mGLContext->IsOffscreen(), "canvas gl context isn't offscreen");
// [Basic Layers, non-OMTC] WebGL layer init.
// `GLScreenBuffer::Morph`ing is only needed in BasicShadowableCanvasLayer.
} else if (aData.mDrawTarget) {
mDrawTarget = aData.mDrawTarget;
mSurface = gfxPlatform::GetPlatform()->CreateThebesSurfaceAliasForDrawTarget_hack(mDrawTarget);
mNeedsYFlip = false;
} else {
NS_ERROR("CanvasLayer created without mSurface, mDrawTarget or mGLContext?");
}
mBounds.SetRect(0, 0, aData.mSize.width, aData.mSize.height);
}
void
CopyableCanvasLayer::UpdateSurface(gfxASurface* aDestSurface, Layer* aMaskLayer)
{
if (!IsDirty())
return;
Painted();
if (mDrawTarget) {
mDrawTarget->Flush();
if (mDrawTarget->GetType() == BACKEND_COREGRAPHICS_ACCELERATED) {
// We have an accelerated CG context which has changed, unlike a bitmap surface
// where we can alias the bits on initializing the mDrawTarget, we need to readback
// and copy the accelerated surface each frame. We want to support this for quick
// thumbnail but if we're going to be doing this every frame it likely is better
// to use a non accelerated (bitmap) canvas.
mSurface = gfxPlatform::GetPlatform()->GetThebesSurfaceForDrawTarget(mDrawTarget);
}
}
if (!mGLContext && aDestSurface) {
nsRefPtr<gfxContext> tmpCtx = new gfxContext(aDestSurface);
tmpCtx->SetOperator(gfxContext::OPERATOR_SOURCE);
CopyableCanvasLayer::PaintWithOpacity(tmpCtx, 1.0f, aMaskLayer);
return;
}
if (mGLContext) {
if (aDestSurface && aDestSurface->GetType() != gfxASurface::SurfaceTypeImage) {
MOZ_ASSERT(false, "Destination surface must be ImageSurface type.");
return;
}
nsRefPtr<gfxImageSurface> readSurf;
nsRefPtr<gfxImageSurface> resultSurf;
SharedSurface* sharedSurf = mGLContext->RequestFrame();
if (!sharedSurf) {
NS_WARNING("Null frame received.");
return;
}
gfxIntSize readSize(sharedSurf->Size());
gfxImageFormat format = (GetContentFlags() & CONTENT_OPAQUE)
? gfxASurface::ImageFormatRGB24
: gfxASurface::ImageFormatARGB32;
if (aDestSurface) {
resultSurf = static_cast<gfxImageSurface*>(aDestSurface);
} else {
resultSurf = GetTempSurface(readSize, format);
}
MOZ_ASSERT(resultSurf);
if (resultSurf->CairoStatus() != 0) {
MOZ_ASSERT(false, "Bad resultSurf->CairoStatus().");
return;
}
MOZ_ASSERT(sharedSurf->APIType() == APITypeT::OpenGL);
SharedSurface_GL* surfGL = SharedSurface_GL::Cast(sharedSurf);
if (surfGL->Type() == SharedSurfaceType::Basic) {
SharedSurface_Basic* sharedSurf_Basic = SharedSurface_Basic::Cast(surfGL);
readSurf = sharedSurf_Basic->GetData();
} else {
if (resultSurf->Format() == format &&
resultSurf->GetSize() == readSize)
{
readSurf = resultSurf;
} else {
readSurf = GetTempSurface(readSize, format);
}
// Readback handles Flush/MarkDirty.
mGLContext->Screen()->Readback(surfGL, readSurf);
}
MOZ_ASSERT(readSurf);
bool needsPremult = surfGL->HasAlpha() && !mIsGLAlphaPremult;
if (needsPremult) {
gfxImageSurface* sizedReadSurf = nullptr;
if (readSurf->Format() == resultSurf->Format() &&
readSurf->GetSize() == resultSurf->GetSize())
{
sizedReadSurf = readSurf;
} else {
readSurf->Flush();
nsRefPtr<gfxContext> ctx = new gfxContext(resultSurf);
ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
ctx->SetSource(readSurf);
ctx->Paint();
sizedReadSurf = resultSurf;
}
MOZ_ASSERT(sizedReadSurf);
readSurf->Flush();
resultSurf->Flush();
gfxUtils::PremultiplyImageSurface(readSurf, resultSurf);
resultSurf->MarkDirty();
} else if (resultSurf != readSurf) {
// Didn't need premult, but we do need to blit to resultSurf
readSurf->Flush();
nsRefPtr<gfxContext> ctx = new gfxContext(resultSurf);
ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
ctx->SetSource(readSurf);
ctx->Paint();
}
// stick our surface into mSurface, so that the Paint() path is the same
if (!aDestSurface) {
mSurface = resultSurf;
}
}
}
void
CopyableCanvasLayer::PaintWithOpacity(gfxContext* aContext,
float aOpacity,
Layer* aMaskLayer,
gfxContext::GraphicsOperator aOperator)
{
if (!mSurface) {
NS_WARNING("No valid surface to draw!");
return;
}
nsRefPtr<gfxPattern> pat = new gfxPattern(mSurface);
pat->SetFilter(mFilter);
pat->SetExtend(gfxPattern::EXTEND_PAD);
gfxMatrix m;
if (mNeedsYFlip) {
m = aContext->CurrentMatrix();
aContext->Translate(gfxPoint(0.0, mBounds.height));
aContext->Scale(1.0, -1.0);
}
// If content opaque, then save off current operator and set to source.
// This ensures that alpha is not applied even if the source surface
// has an alpha channel
gfxContext::GraphicsOperator savedOp;
if (GetContentFlags() & CONTENT_OPAQUE) {
savedOp = aContext->CurrentOperator();
aContext->SetOperator(gfxContext::OPERATOR_SOURCE);
}
AutoSetOperator setOperator(aContext, aOperator);
aContext->NewPath();
// No need to snap here; our transform is already set up to snap our rect
aContext->Rectangle(gfxRect(0, 0, mBounds.width, mBounds.height));
aContext->SetPattern(pat);
FillWithMask(aContext, aOpacity, aMaskLayer);
// Restore surface operator
if (GetContentFlags() & CONTENT_OPAQUE) {
aContext->SetOperator(savedOp);
}
if (mNeedsYFlip) {
aContext->SetMatrix(m);
}
}
}
}