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/* -*- Mode: C++; tab-width: 20; 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 "gfxQuartzNativeDrawing.h"
#include "gfxPlatform.h"
#include "mozilla/gfx/Helpers.h"
using namespace mozilla::gfx;
using namespace mozilla;
gfxQuartzNativeDrawing::gfxQuartzNativeDrawing(DrawTarget& aDrawTarget,
const Rect& nativeRect)
: mDrawTarget(&aDrawTarget), mNativeRect(nativeRect), mCGContext(nullptr) {}
CGContextRef gfxQuartzNativeDrawing::BeginNativeDrawing() {
NS_ASSERTION(!mCGContext,
"BeginNativeDrawing called when drawing already in progress");
DrawTarget* dt = mDrawTarget;
if (dt->IsDualDrawTarget() || dt->IsTiledDrawTarget() || dt->IsCaptureDT() ||
dt->GetBackendType() != BackendType::SKIA || dt->IsRecording()) {
// We need a DrawTarget that we can get a CGContextRef from:
Matrix transform = dt->GetTransform();
mNativeRect = transform.TransformBounds(mNativeRect);
mNativeRect.RoundOut();
if (mNativeRect.IsEmpty()) {
return nullptr;
}
mTempDrawTarget = Factory::CreateDrawTarget(
BackendType::SKIA,
IntSize::Truncate(mNativeRect.width, mNativeRect.height),
SurfaceFormat::B8G8R8A8);
if (!mTempDrawTarget) {
return nullptr;
}
transform.PostTranslate(-mNativeRect.x, -mNativeRect.y);
mTempDrawTarget->SetTransform(transform);
dt = mTempDrawTarget;
} else {
// Clip the DT in case BorrowedCGContext needs to create a new layer.
// This prevents it from creating a new layer the size of the window.
// But make sure that this clip is device pixel aligned.
Matrix transform = dt->GetTransform();
Rect deviceRect = transform.TransformBounds(mNativeRect);
deviceRect.RoundOut();
mNativeRect = transform.Inverse().TransformBounds(deviceRect);
mDrawTarget->PushClipRect(mNativeRect);
}
MOZ_ASSERT(dt->GetBackendType() == BackendType::SKIA);
mCGContext = mBorrowedContext.Init(dt);
if (NS_WARN_IF(!mCGContext)) {
// Failed borrowing CG context, so we need to clean up.
if (!mTempDrawTarget) {
mDrawTarget->PopClip();
}
return nullptr;
}
return mCGContext;
}
void gfxQuartzNativeDrawing::EndNativeDrawing() {
NS_ASSERTION(mCGContext,
"EndNativeDrawing called without BeginNativeDrawing");
mBorrowedContext.Finish();
if (mTempDrawTarget) {
RefPtr<SourceSurface> source = mTempDrawTarget->Snapshot();
AutoRestoreTransform autoRestore(mDrawTarget);
mDrawTarget->SetTransform(Matrix());
mDrawTarget->DrawSurface(source, mNativeRect,
Rect(0, 0, mNativeRect.width, mNativeRect.height));
} else {
mDrawTarget->PopClip();
}
}