Format argument of CompressedTexSubImage2D should match format of texture being modified

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1896 matching lines @@
     WebGLTexture* tex = validateTextureBinding("compressedTexSubImage2D", target, true);
     if (!tex)
         return;
 
     if (!validateTexFuncLevel("compressedTexSubImage2D", target, level))
         return;
     if (!validateCompressedTexFormat(format)) {
         synthesizeGLError(GL_INVALID_ENUM, "compressedTexSubImage2D", "invalid format");
         return;
     }
+    if (format != tex->getInternalFormat(target, level)) {
+        synthesizeGLError(GL_INVALID_OPERATION, "compressedTexSubImage2D", "format does not match texture format");
+        return;
+    }
     if (!validateCompressedTexFuncData("compressedTexSubImage2D", width, height, format, data))
         return;
 
-    if (!isWebGL2OrHigher() && format != tex->getInternalFormat(target, level)) {
-        synthesizeGLError(GL_INVALID_OPERATION, "compressedTexSubImage2D", "format does not match texture format");
-        return;
-    }
-
     if (!validateCompressedTexSubDimensions("compressedTexSubImage2D", target, level, xoffset, yoffset, width, height, format, tex))
         return;
 
     webContext()->compressedTexSubImage2D(target, level, xoffset, yoffset,
         width, height, format, data->byteLength(), data->baseAddress());
 }
 
 bool WebGLRenderingContextBase::validateSettableTexFormat(const char* functionName, GLenum format)
 {
     if (isWebGL2OrHigher())
@@ skipping 5021 matching lines @@
         webContext()->pixelStorei(GL_UNPACK_ALIGNMENT, 1);
 }
 
 void WebGLRenderingContextBase::restoreUnpackParameters()
 {
     if (m_unpackAlignment != 1)
         webContext()->pixelStorei(GL_UNPACK_ALIGNMENT, m_unpackAlignment);
 }
 
 } // namespace blink