Extend SkImageGenerator to support natively generated GrTextures

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"
+#include "SkNextID.h"
+
+SkImageGenerator::SkImageGenerator(const SkImageInfo& info)
+    : fInfo(info)
+    , fUniqueID(SkNextID::ImageID())
+{}
 
 bool SkImageGenerator::getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
                                  SkPMColor ctable[], int* ctableCount) {
     if (kUnknown_SkColorType == info.colorType()) {
         return false;
     }
     if (NULL == pixels) {
         return false;
     }
     if (rowBytes < info.minRowBytes()) {
@@ skipping 72 matching lines @@
     // In order to maintain compatibility with clients that implemented the original
     // onGetYUV8Planes interface, we assume that the color space is JPEG.
     // TODO(rileya): remove this and the old onGetYUV8Planes once clients switch over to
     // the new interface.
     if (colorSpace) {
         *colorSpace = kJPEG_SkYUVColorSpace;
     }
     return this->onGetYUV8Planes(sizes, planes, rowBytes);
 }
 
+GrTexture* SkImageGenerator::generateTexture(GrContext* ctx, SkImageUsageType usage) {
+    if (!ctx) {
+        return nullptr;
+    }
+    return this->onGenerateTexture(ctx, usage);
+}
+
 /////////////////////////////////////////////////////////////////////////////////////////////
 
 SkData* SkImageGenerator::onRefEncodedData() {
     return NULL;
 }
 
 bool SkImageGenerator::onGetPixels(const SkImageInfo& info, void* dst, size_t rb,
                                    SkPMColor* colors, int* colorCount) {
     return false;
 }
@@ skipping 16 matching lines @@
     if (NULL == data) {
         return NULL;
     }
     if (gFactory) {
         if (SkImageGenerator* generator = gFactory(data)) {
             return generator;
         }
     }
     return SkImageGenerator::NewFromEncodedImpl(data);
 }