1 files changed, 86 insertions, 0 deletions
diff --git a/gfx/thebes/gfxQuartzNativeDrawing.cpp b/gfx/thebes/gfxQuartzNativeDrawing.cpp
new file mode 100644
index 0000000000..bd8658df24
--- /dev/null
+++ b/gfx/thebes/gfxQuartzNativeDrawing.cpp
@@ -0,0 +1,86 @@
+/* -*- 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->IsTiledDrawTarget() || 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();
+  }
+}