WebGL 2: add types into glReadPixels

Source/modules/webgl/WebGLRenderingContextBase.h

 /*
  * 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 811 matching lines @@
     // Helper function to check readbuffer validity for readPixels and copyTex{Sub}Image.
     // If yes, obtains the readbuffer's format, type, the bound read framebuffer, returns true.
     // If not, generates a GL error, returns false.
     // Note: it's OK to pass format == nullptr and type == nullptr.
     bool validateReadBufferAndGetInfo(const char* functionName, WebGLFramebuffer*& readFramebufferBinding, GLenum* format, GLenum* type);
 
     // Helper function to check format/type enums for readPixels.
     // Generates INVALID_ENUM and returns false if parameters are invalid.
     virtual bool validateReadPixelsFormatAndType(GLenum format, GLenum type);
 
+    // Helper function to get expected ArrayBuffer view type for readPixels.
+    virtual DOMArrayBufferView::ViewType readPixelsExpectedArrayBufferViewType(GLenum type);
+
     // Helper function to check format/type combination for readPixels.
     // Generates INVALID_OPERATION and returns false if the combination is unsupported.
     bool validateReadPixelsFormatTypeCombination(GLenum format, GLenum type, GLenum readBufferInternalFormat, GLenum readBufferType);
 
     virtual GLint getMaxTextureLevelForTarget(GLenum target);
 
     // Helper function to check input level for functions {copy}Tex{Sub}Image.
     // Generates GL error and returns false if level is invalid.
     bool validateTexFuncLevel(const char* functionName, GLenum target, GLint level);
 
@@ skipping 209 matching lines @@
     static IntSize oldestContextSize();
 };
 
 DEFINE_TYPE_CASTS(WebGLRenderingContextBase, CanvasRenderingContext, context, context->is3d(), context.is3d());
 
 } // namespace blink
 
 WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(blink::WebGLRenderingContextBase::TextureUnitState);
 
 #endif // WebGLRenderingContextBase_h