Skia side RGB to YUV gpu conversion

src/core/SkImageGenerator.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImageGenerator.h"
 
 #ifndef SK_SUPPORT_LEGACY_IMAGEGENERATORAPI
@@ skipping 39 matching lines @@
 
 bool SkImageGenerator::getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes) {
     SkASSERT(kIndex_8_SkColorType != info.colorType());
     if (kIndex_8_SkColorType == info.colorType()) {
         return false;
     }
     return this->getPixels(info, pixels, rowBytes, NULL, NULL);
 }
 #endif
 
+bool SkImageGenerator::getYUV8Planes(SkISize sizes[3], void* planes[3], int rowBytes[3]) {

[reed1, 2014/07/10 17:15:15]

This is a good place to add generic checks and/or asserts for sane input.

e.g.
    if planes != NULL but rowBytes == NULL
    if planes != NULL but planes[0] or [1] or [2] is NULL
    if rowBytes[i] < sizes[i].fWidth
    if sizes[i].fWidth or fHeight < 0

[sugoi1, 2014/07/10 17:54:24]

Done.

+    return this->onGetYUV8Planes(sizes, planes, rowBytes);
+}
+
+bool SkImageGenerator::onGetYUV8Planes(SkISize sizes[3], void* planes[3], int rowBytes[3]) {
+    return false;
+}
+
 /////////////////////////////////////////////////////////////////////////////////////////////
 
 SkData* SkImageGenerator::onRefEncodedData() {
     return NULL;
 }
 
 bool SkImageGenerator::onGetInfo(SkImageInfo*) {
     return false;
 }
 
 bool SkImageGenerator::onGetPixels(const SkImageInfo&, void*, size_t, SkPMColor*, int*) {
     return false;
 }