Add ability to extract YUV planes from SkImage

src/image/SkImage.cpp

Index: src/image/SkImage.cpp
diff --git a/src/image/SkImage.cpp b/src/image/SkImage.cpp
index 25370bcff15e09ad2e7276ec3a98f23e4a79cf35..5c2ea626bc12dc39003b21fccce49b5ae9c89fdb 100644
--- a/src/image/SkImage.cpp
+++ b/src/image/SkImage.cpp
@@ -258,6 +258,25 @@ bool SkImage::readPixels(const SkPixmap& pmap, int srcX, int srcY, CachingHint c
     return this->readPixels(pmap.info(), pmap.writable_addr(), pmap.rowBytes(), srcX, srcY, chint);
 }
 
+#if SK_SUPPORT_GPU
+#include "GrTextureToYUVPlanes.h"
+#endif
+
+#include "SkRGBAToYUV.h"
+

[robertphillips, 2016/01/29 20:33:13]

overlength ?

[bsalomon, 2016/02/01 20:27:45]

Done.

+bool SkImage::readYUV8Planes(const SkISize sizes[3], void* const planes[3], const size_t rowBytes[3],
+                             SkYUVColorSpace colorSpace) {
+#if SK_SUPPORT_GPU
+    if (GrTexture* texture = as_IB(this)->peekTexture()) {
+        if (GrTextureToYUVPlanes(texture, sizes, planes, rowBytes, colorSpace)) {
+            return true;
+        }
+    }
+#endif
+    SkRGBAToYUV(this, sizes, planes, rowBytes, colorSpace);
+    return true;
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 SkImage* SkImage::NewFromBitmap(const SkBitmap& bm) {