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