Implement helper functionalities for computing image size with ES3 settings.

gpu/command_buffer/service/context_state.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 ContextState class.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_
 #define GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_
 
 #include <vector>
@@ skipping 120 matching lines @@
 GPU_EXPORT void Vec4::GetValues<GLuint>(GLuint* values) const;
 
 template <>
 GPU_EXPORT void Vec4::SetValues<GLfloat>(const GLfloat* values);
 template <>
 GPU_EXPORT void Vec4::SetValues<GLint>(const GLint* values);
 template <>
 GPU_EXPORT void Vec4::SetValues<GLuint>(const GLuint* values);
 
 struct GPU_EXPORT ContextState {
+  enum Dimension {
+    k2D,
+    k3D
+  };
+
   ContextState(FeatureInfo* feature_info,
                ErrorStateClient* error_state_client,
                Logger* logger);
   ~ContextState();
 
   void Initialize();
 
   void SetIgnoreCachedStateForTest(bool ignore) {
     ignore_cached_state = ignore;
   }
@@ skipping 62 matching lines @@
   }
 
   ErrorState* GetErrorState();
 
   void SetBoundBuffer(GLenum target, Buffer* buffer);
   void RemoveBoundBuffer(Buffer* buffer);
 
   void UnbindTexture(TextureRef* texture);
   void UnbindSampler(Sampler* sampler);
 
+  PixelStoreParams GetPackParams();
+  PixelStoreParams GetUnpackParams(Dimension dimension);
+
   #include "gpu/command_buffer/service/context_state_autogen.h"
 
   EnableFlags enable_flags;
 
   // Current active texture by 0 - n index.
   // In other words, if we call glActiveTexture(GL_TEXTURE2) this value would
   // be 2.
   GLuint active_texture_unit;
 
   // The currently bound array buffer. If this is 0 it is illegal to call
@@ skipping 47 matching lines @@
 
   FeatureInfo* feature_info_;
   scoped_ptr<ErrorState> error_state_;
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_