Add onImageInfo call to SkImage_Base.

src/image/SkImage_Generator.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImage_Base.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkData.h"
 #include "SkImageCacherator.h"
 #include "SkImagePriv.h"
 #include "SkPixelRef.h"
 #include "SkSurface.h"
 
 class SkImage_Generator : public SkImage_Base {
 public:
     SkImage_Generator(SkImageCacherator* cache)
         : INHERITED(cache->info().width(), cache->info().height(), cache->uniqueID())
         , fCache(cache) // take ownership
     {}
 
+    virtual SkImageInfo onImageInfo() const override {
+        return fCache->info();
+    }
+
     bool onReadPixels(const SkImageInfo&, void*, size_t, int srcX, int srcY, CachingHint) const override;
     SkImageCacherator* peekCacherator() const override { return fCache; }
     SkData* onRefEncoded(GrContext*) const override;
     bool isOpaque() const override { return fCache->info().isOpaque(); }
     sk_sp<SkImage> onMakeSubset(const SkIRect&) const override;
     bool getROPixels(SkBitmap*, CachingHint) const override;
     GrTexture* asTextureRef(GrContext*, const GrTextureParams&) const override;
     bool onIsLazyGenerated() const override { return true; }
 
 private:
@@ skipping 58 matching lines @@
 sk_sp<SkImage> SkImage::MakeFromGenerator(SkImageGenerator* generator, const SkIRect* subset) {
     if (!generator) {
         return nullptr;
     }
     SkImageCacherator* cache = SkImageCacherator::NewFromGenerator(generator, subset);
     if (!cache) {
         return nullptr;
     }
     return sk_make_sp<SkImage_Generator>(cache);
 }