Handle compressed textures allocated via TexStorage2D.

gpu/command_buffer/service/gles2_cmd_decoder.h

 // Copyright (c) 2012 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.
 
 // This file contains the GLES2Decoder class.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_
 
 #include <stdint.h>
@@ skipping 227 matching lines @@
   virtual bool ClearLevel(Texture* texture,
                           unsigned target,
                           int level,
                           unsigned format,
                           unsigned type,
                           int xoffset,
                           int yoffset,
                           int width,
                           int height) = 0;
 
+  // Clears a level sub area of a compressed 2D texture.
+  // Returns false if a GL error should be generated.
+  virtual bool ClearCompressedTextureLevel(Texture* texture,
+                                           unsigned target,
+                                           int level,
+                                           unsigned format,
+                                           int width,
+                                           int height) = 0;
+
+  // Indicates whether a given internal format is one for a compressed
+  // texture.
+  virtual bool IsCompressedTextureFormat(unsigned format) = 0;
+
   // Clears a level of a 3D texture.
   // Returns false if a GL error should be generated.
   virtual bool ClearLevel3D(Texture* texture,
                             unsigned target,
                             int level,
                             unsigned format,
                             unsigned type,
                             int width,
                             int height,
                             int depth) = 0;
@@ skipping 42 matching lines @@
   bool log_commands_;
   bool unsafe_es3_apis_enabled_;
   bool force_shader_name_hashing_for_test_;
   DISALLOW_COPY_AND_ASSIGN(GLES2Decoder);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_