Bug 856272; don't round our mask size too early so we get a proper transform for small surfaces. r=roc
authorNicholas Cameron <ncameron@mozilla.com>
Fri, 05 Apr 2013 16:16:38 +1300
changeset 127755 91ac668eeace1af9bf22b24e2d4ea3bd8574427b
parent 127754 bef79d45847ac466040f65c64b14332704356814
child 127756 4c45dbd81a3224768c250fd2bac7d0dbc53d98e6
push id24512
push userryanvm@gmail.com
push dateFri, 05 Apr 2013 20:13:49 +0000
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Bug 856272; don't round our mask size too early so we get a proper transform for small surfaces. r=roc
--- a/layout/base/FrameLayerBuilder.cpp
+++ b/layout/base/FrameLayerBuilder.cpp
@@ -3734,26 +3734,26 @@ ContainerState::SetupMaskLayer(Layer *aL
   // calculate a more precise bounding rect
   const int32_t A2D = mContainerFrame->PresContext()->AppUnitsPerDevPixel();
   gfxRect boundingRect = CalculateBounds(newData.mRoundedClipRects, A2D);
   boundingRect.Scale(mParameters.mXScale, mParameters.mYScale);
   uint32_t maxSize = mManager->GetMaxTextureSize();
   NS_ASSERTION(maxSize > 0, "Invalid max texture size");
-  nsIntSize surfaceSize(std::min<int32_t>(boundingRect.Width(), maxSize),
-                        std::min<int32_t>(boundingRect.Height(), maxSize));
+  gfxSize surfaceSize(std::min<float>(boundingRect.Width(), maxSize),
+                      std::min<float>(boundingRect.Height(), maxSize));
   // maskTransform is applied to the clip when it is painted into the mask (as a
   // component of imageTransform), and its inverse used when the mask is used for
   // masking.
   // It is the transform from the masked layer's space to mask space
   gfxMatrix maskTransform;
-  maskTransform.Scale(float(surfaceSize.width)/float(boundingRect.Width()),
-                      float(surfaceSize.height)/float(boundingRect.Height()));
+  maskTransform.Scale(surfaceSize.width/boundingRect.Width(),
+                      surfaceSize.height/boundingRect.Height());
   // imageTransform is only used when the clip is painted to the mask
   gfxMatrix imageTransform = maskTransform;
   imageTransform.Scale(mParameters.mXScale, mParameters.mYScale);
   nsAutoPtr<MaskLayerImageCache::MaskLayerImageKey> newKey(
     new MaskLayerImageCache::MaskLayerImageKey());
@@ -3767,19 +3767,21 @@ ContainerState::SetupMaskLayer(Layer *aL
   const MaskLayerImageCache::MaskLayerImageKey* lookupKey = newKey;
   // check to see if we can reuse a mask image
   nsRefPtr<ImageContainer> container =
   if (!container) {
+    nsIntSize surfaceSizeInt = nsIntSize(NSToIntCeil(surfaceSize.width),
+                                         NSToIntCeil(surfaceSize.height));
     // no existing mask image, so build a new one
     nsRefPtr<gfxASurface> surface =
-      aLayer->Manager()->CreateOptimalMaskSurface(surfaceSize);
+      aLayer->Manager()->CreateOptimalMaskSurface(surfaceSizeInt);
     // fail if we can't get the right surface
     if (!surface || surface->CairoStatus()) {
       NS_WARNING("Could not create surface for mask layer.");
       SetClipCount(thebesData, 0);
@@ -3793,17 +3795,17 @@ ContainerState::SetupMaskLayer(Layer *aL
     // build the image and container
     container = aLayer->Manager()->CreateImageContainer();
     NS_ASSERTION(container, "Could not create image container for mask layer.");
     static const ImageFormat format = CAIRO_SURFACE;
     nsRefPtr<Image> image = container->CreateImage(&format, 1);
     NS_ASSERTION(image, "Could not create image container for mask layer.");
     CairoImage::Data data;
     data.mSurface = surface;
-    data.mSize = surfaceSize;
+    data.mSize = surfaceSizeInt;
     GetMaskLayerImageCache()->PutImage(newKey.forget(), container);