1 files changed, 64 insertions, 0 deletions
diff --git a/gfx/layers/ImageLayers.cpp b/gfx/layers/ImageLayers.cpp
new file mode 100644
index 000000000..454ddb921
--- /dev/null
+++ b/gfx/layers/ImageLayers.cpp
@@ -0,0 +1,64 @@
+/* -*- 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 "ImageLayers.h"
+#include "ImageContainer.h"             // for ImageContainer
+#include "gfxRect.h"                    // for gfxRect
+#include "nsDebug.h"                    // for NS_ASSERTION
+#include "nsISupportsImpl.h"            // for ImageContainer::Release, etc
+#include "gfx2DGlue.h"
+
+namespace mozilla {
+namespace layers {
+
+ImageLayer::ImageLayer(LayerManager* aManager, void* aImplData)
+: Layer(aManager, aImplData), mSamplingFilter(gfx::SamplingFilter::GOOD)
+, mScaleMode(ScaleMode::SCALE_NONE)
+{}
+
+ImageLayer::~ImageLayer()
+{}
+
+void ImageLayer::SetContainer(ImageContainer* aContainer) 
+{
+  mContainer = aContainer;
+}
+
+void ImageLayer::ComputeEffectiveTransforms(const gfx::Matrix4x4& aTransformToSurface)
+{
+  gfx::Matrix4x4 local = GetLocalTransform();
+
+  // Snap image edges to pixel boundaries
+  gfxRect sourceRect(0, 0, 0, 0);
+  if (mContainer) {
+    sourceRect.SizeTo(mContainer->GetCurrentSize());
+  }
+  // Snap our local transform first, and snap the inherited transform as well.
+  // This makes our snapping equivalent to what would happen if our content
+  // was drawn into a PaintedLayer (gfxContext would snap using the local
+  // transform, then we'd snap again when compositing the PaintedLayer).
+  mEffectiveTransform =
+      SnapTransform(local, sourceRect, nullptr) *
+      SnapTransformTranslation(aTransformToSurface, nullptr);
+
+  if (mScaleMode != ScaleMode::SCALE_NONE &&
+      sourceRect.width != 0.0 && sourceRect.height != 0.0) {
+    NS_ASSERTION(mScaleMode == ScaleMode::STRETCH,
+                 "No other scalemodes than stretch and none supported yet.");
+    local.PreScale(mScaleToSize.width / sourceRect.width,
+                   mScaleToSize.height / sourceRect.height, 1.0);
+
+    mEffectiveTransformForBuffer =
+        SnapTransform(local, sourceRect, nullptr) *
+        SnapTransformTranslation(aTransformToSurface, nullptr);
+  } else {
+    mEffectiveTransformForBuffer = mEffectiveTransform;
+  }
+
+  ComputeEffectiveTransformForMaskLayers(aTransformToSurface);
+}
+
+} // namespace layers
+} // namespace mozilla