Refactor CopyTexture method determination

gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc

 // 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.
 
 #include "gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 700 matching lines @@
     GLenum dest_target,
     GLuint dest_id,
     GLint dest_level,
     GLenum dest_internal_format,
     GLsizei width,
     GLsizei height,
     bool flip_y,
     bool premultiply_alpha,
     bool unpremultiply_alpha,
     CopyTextureMethod method) {
-  bool premultiply_alpha_change = premultiply_alpha ^ unpremultiply_alpha;
-  GLenum dest_binding_target =
-      gpu::gles2::GLES2Util::GLFaceTargetToTextureTarget(dest_target);
-
-  // GL_TEXTURE_RECTANGLE_ARB on FBO is supported by OpenGL, not GLES2,
-  // so restrict this to GL_TEXTURE_2D and GL_TEXTURE_CUBE_MAP.
-  if (source_target == GL_TEXTURE_2D &&
-      (dest_binding_target == GL_TEXTURE_2D ||
-       dest_binding_target == GL_TEXTURE_CUBE_MAP) &&
-      !flip_y && !premultiply_alpha_change && method == DIRECT_COPY) {
+  if (method == DIRECT_COPY) {
     DoCopyTexImage2D(decoder, source_target, source_id, source_level,
                      dest_target, dest_id, dest_level, dest_internal_format,
                      width, height, framebuffer_);
     return;
   }
 
   // Draw to level 0 of an intermediate GL_TEXTURE_2D texture.
   GLuint dest_texture = dest_id;
   GLuint intermediate_texture = 0;
   GLint original_dest_level = dest_level;
@@ skipping 48 matching lines @@
     GLsizei width,
     GLsizei height,
     GLsizei dest_width,
     GLsizei dest_height,
     GLsizei source_width,
     GLsizei source_height,
     bool flip_y,
     bool premultiply_alpha,
     bool unpremultiply_alpha,
     CopyTextureMethod method) {
-  bool premultiply_alpha_change = premultiply_alpha ^ unpremultiply_alpha;
-  GLenum dest_binding_target =
-      gpu::gles2::GLES2Util::GLFaceTargetToTextureTarget(dest_target);
-
-  // GL_TEXTURE_RECTANGLE_ARB on FBO is supported by OpenGL, not GLES2,
-  // so restrict this to GL_TEXTURE_2D and GL_TEXTURE_CUBE_MAP.
-  if (source_target == GL_TEXTURE_2D &&
-      (dest_binding_target == GL_TEXTURE_2D ||
-       dest_binding_target == GL_TEXTURE_CUBE_MAP) &&
-      !flip_y && !premultiply_alpha_change && method == DIRECT_COPY) {
+  if (method == DIRECT_COPY) {
     DoCopyTexSubImage2D(decoder, source_target, source_id, source_level,
                         dest_target, dest_id, dest_level, xoffset, yoffset, x,
                         y, width, height, framebuffer_);
     return;
   }
 
   // Draw to level 0 of an intermediate GL_TEXTURE_2D texture.
   GLint dest_xoffset = xoffset;
   GLint dest_yoffset = yoffset;
   GLuint dest_texture = dest_id;
@@ skipping 328 matching lines @@
   decoder->RestoreTextureUnitBindings(0);
   decoder->RestoreActiveTexture();
   decoder->RestoreProgramBindings();
   decoder->RestoreBufferBindings();
   decoder->RestoreFramebufferBindings();
   decoder->RestoreGlobalState();
 }
 
 }  // namespace gles2
 }  // namespace gpu