Refactor SoftwareImageDecodeController

cc/tiles/software_image_decode_controller.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TILES_SOFTWARE_IMAGE_DECODE_CONTROLLER_H_
 #define CC_TILES_SOFTWARE_IMAGE_DECODE_CONTROLLER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 193 matching lines @@
   // Get the decoded draw image for the given key and draw_image. Note that this
   // function has to be called with no lock acquired, since it will acquire its
   // own locks and might call DecodeImageInternal above. Also note that this
   // function will use the provided key, even if
   // ImageKey::FromDrawImage(draw_image) would return a different key.
   // Note that when used internally, we still require that
   // DrawWithImageFinished() is called afterwards.
   DecodedDrawImage GetDecodedImageForDrawInternal(const ImageKey& key,
                                                   const DrawImage& draw_image);
 
+  // GetOriginalImageDecode is called by DecodeImageInternal when the quality
+  // does not scale the image. Like DecodeImageInternal, it should be called
+  // with no lock acquired and it returns nullptr if the decoding failed.
+  std::unique_ptr<DecodedImage> GetOriginalImageDecode(const ImageKey& key,
+                                                       const SkImage& image);
+
+  // GetScaledImageDecode is called by DecodeImageInternal when the quality
+  // requires the image be scaled. Like DecodeImageInternal, it should be
+  // called with no lock acquired and it returns nullptr if the decoding or
+  // scaling failed.
+  std::unique_ptr<DecodedImage> GetScaledImageDecode(const ImageKey& key,
+                                                     const SkImage& image);
+
   void SanityCheckState(int line, bool lock_acquired);
   void RefImage(const ImageKey& key);
   void RefAtRasterImage(const ImageKey& key);
   void UnrefAtRasterImage(const ImageKey& key);
 
   // These functions indicate whether the images can be handled and cached by
   // ImageDecodeController or whether they will fall through to Skia (with
   // exception of possibly prerolling them). Over time these should return
   // "false" in less cases, as the ImageDecodeController should start handling
   // more of them.
@@ skipping 29 matching lines @@
 
   ResourceFormat format_;
 
   // Used to uniquely identify DecodedImages for memory traces.
   base::AtomicSequenceNumber next_tracing_id_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TILES_SOFTWARE_IMAGE_DECODE_CONTROLLER_H_