Add CSS image-orientation: from-image

Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp

 /*
  * Copyright (C) 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 39 matching lines @@
 #include "core/paint/DeprecatedPaintLayerPainter.h"
 #include "core/paint/DeprecatedPaintLayerStackingNodeIterator.h"
 #include "core/paint/ScrollableAreaPainter.h"
 #include "core/paint/TransformRecorder.h"
 #include "core/plugins/PluginView.h"
 #include "core/style/KeyframeList.h"
 #include "platform/LengthFunctions.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/fonts/FontCache.h"
 #include "platform/geometry/TransformState.h"
+#include "platform/graphics/BitmapImage.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/paint/ClipDisplayItem.h"
 #include "platform/graphics/paint/DisplayItemList.h"
 #include "platform/graphics/paint/TransformDisplayItem.h"
 #include "wtf/CurrentTime.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 using namespace HTMLNames;
@@ skipping 1774 matching lines @@
     LayoutObject* layoutObject = this->layoutObject();
     if (m_owningLayer.hasBoxDecorationsOrBackground() || layoutObject->hasClip() || layoutObject->hasClipPath())
         return false;
 
     LayoutImage* imageLayoutObject = toLayoutImage(layoutObject);
     if (ImageResource* cachedImage = imageLayoutObject->cachedImage()) {
         if (!cachedImage->hasImage())
             return false;
 
         Image* image = cachedImage->imageForLayoutObject(imageLayoutObject);
-        return image->isBitmapImage();
+        if (!image->isBitmapImage())
+            return false;
+
+        return imageLayoutObject->style()->respectImageOrientation() != RespectImageOrientation
+            || toBitmapImage(image)->size() == toBitmapImage(image)->sizeRespectingOrientation();

[Noel Gordon, 2015/06/12 16:21:04]

The first part of the clause looks right to me.  Bust it out into a separate if
statement.

The second part is interesting. If an image is orientated by 180 deg, the
orientated size and the natural size() are the same. So how is that rotation
sent to the GPU? I don't think ImageLayer supports that, nor do I see a change
to ImageLayer in your patch.  /curious I expect the GPU will just draw your
image un-orientated -> bug.

[rwlbuis, 2015/06/15 17:21:52]

Done.
Will experiment a bit with that, you could be right...

     }
 
     return false;
 }
 
 void CompositedDeprecatedPaintLayerMapping::contentChanged(ContentChangeType changeType)
 {
     if ((changeType == ImageChanged) && layoutObject()->isImage() && isDirectlyCompositedImage()) {
         updateImageContents();
         return;
@@ skipping 478 matching lines @@
     } else if (graphicsLayer == m_scrollingBlockSelectionLayer.get()) {
         name = "Scrolling Block Selection Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink