101426 2012-11-06 21:22:37 -0800 Coordinated Graphics: Decode an image directly into a GraphicsSurface. 2013-03-12 01:01:18 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified NEW P2 Normal --- 1 dongseong.hwang webkit-unassigned kalyan.kondapally kondapallykalyan noam sergio zeno oldest_to_newest 760371 0 dongseong.hwang 2012-11-06 21:22:37 -0800 We need to decode an image directly into a GraphicsSurface when the image is directly composited image that RenderLayerBacking give CoordinatedGraphicsLayer via setContentsToImage. If we make it, we can save temporary memory and remove a copy overhead. 765797 1 173925 noam 2012-11-13 10:48:13 -0800 Created attachment 173925 Partially working patch This shows how it can work, but I'm not sure yet if it's the way to go. 853162 2 dongseong.hwang 2013-03-12 01:01:18 -0700 I think you show the direction where we should go. I think it would be better if we can change only ImageDecoder without changing BitmapImage and ImageSource. I think we can do it as following chromium's approach. for instance, define as follow in NativeImagePtr.h #elif PLATFORM(QT) #if USE(GRAPHICS_SURFACE) typedef GraphicsSurface* NativeImagePtr; #else typedef QPixmap* NativeImagePtr; #endif and every image decoders access NativeImagePtr's pixel. btw, I think the most tricky blocker is caching mechanism of MemoryCache. MemoryCache needs to remove decoded data of CachedImage. But if MemoryCache removes directed-composited image, UI Process encounters null pointer exception. we need to make the plan for this. 173925 2012-11-13 10:48:13 -0800 2012-11-13 10:48:13 -0800 Partially working patch patch.diff text/plain 31473 noam Y29tbWl0IGQ1YjIzZTIzMTQzMThjOTY3YzkzNWEwMTU3ZTA0OTQ4MGQ0MGQ0NWYKQXV0aG9yOiBO bydhbSBSb3NlbnRoYWwgPG5vYW0ucm9zZW50aGFsQG5va2lhLmNvbT4KRGF0ZTogICBUdWUgTm92 IDEzIDEwOjEzOjA2IDIwMTIgLTA4MDAKCiAgICBEZWNvZGUgaW50byBzdXJmYWNlCgpkaWZmIC0t Z2l0IGEvU291cmNlL1dlYkNvcmUvcGxhdGZvcm0vZ3JhcGhpY3MvQml0bWFwSW1hZ2UuY3BwIGIv U291cmNlL1dlYkNvcmUvcGxhdGZvcm0vZ3JhcGhpY3MvQml0bWFwSW1hZ2UuY3BwCmluZGV4IGRl ZjA3MmUuLmYzYTczYTAgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XZWJDb3JlL3BsYXRmb3JtL2dyYXBo aWNzL0JpdG1hcEltYWdlLmNwcAorKysgYi9Tb3VyY2UvV2ViQ29yZS9wbGF0Zm9ybS9ncmFwaGlj cy9CaXRtYXBJbWFnZS5jcHAKQEAgLTEzNyw2ICsxMzcsOSBAQCB2b2lkIEJpdG1hcEltYWdlOjpj YWNoZUZyYW1lKHNpemVfdCBpbmRleCkKICAgICAgICAgbV9mcmFtZXMuZ3JvdyhudW1GcmFtZXMp 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