Avoid GPU readback in tex(Sub)Image2D(ImageBitmap)

third_party/WebKit/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 771 matching lines @@
     };
     enum TexImageByGPUType {
         TexImage2DByGPU,
         TexSubImage2DByGPU,
         TexSubImage3DByGPU
     };
     enum TexImageDimension {
         Tex2D,
         Tex3D
     };
-    // Copy from the canvas element directly to the texture via the GPU, without a read-back to system memory.
-    void texImageCanvasByGPU(TexImageByGPUType, WebGLTexture*, GLenum target, GLint level,
-        GLint internalformat, GLenum type, GLint xoffset, GLint yoffset, GLint zoffset, HTMLCanvasElement*);
-    bool canUseTexImageCanvasByGPU(GLint internalformat, GLenum type);
+    // Copy from the source directly to the texture via the gpu, without a read-back to system memory.
+    // Souce could be canvas or imageBitmap.
+    void texImageByGPU(TexImageByGPUType, WebGLTexture*, GLenum target, GLint level, GLint internalformat,
+        GLenum type, GLint xoffset, GLint yoffset, GLint zoffset, HTMLCanvasElement*, ImageBitmap*);
+    bool canUseTexImageByGPU(GLint internalformat, GLenum type);
 
     virtual WebGLImageConversion::PixelStoreParams getPackPixelStoreParams();
     virtual WebGLImageConversion::PixelStoreParams getUnpackPixelStoreParams(TexImageDimension);
 
     // Helper function for copyTex{Sub}Image, check whether the internalformat
     // and the color buffer format of the current bound framebuffer combination
     // is valid.
     bool isTexInternalFormatColorBufferCombinationValid(GLenum texInternalFormat, GLenum colorBufferFormat);
 
     // Helper function to verify limits on the length of uniform and attribute locations.
@@ skipping 278 matching lines @@
     // If the vector is empty, return the maximum allowed active context number.
     static WebGLRenderingContextBase* oldestContext();
     static WebGLRenderingContextBase* oldestEvictedContext();
 
     CrossThreadWeakPersistentThisPointer<WebGLRenderingContextBase> createWeakThisPointer() { return CrossThreadWeakPersistentThisPointer<WebGLRenderingContextBase>(this); }
 
     ImageBitmap* transferToImageBitmapBase();
 private:
     WebGLRenderingContextBase(HTMLCanvasElement*, OffscreenCanvas*, PassOwnPtr<WebGraphicsContext3DProvider>, const WebGLContextAttributes&);
     static PassOwnPtr<WebGraphicsContext3DProvider> createContextProviderInternal(HTMLCanvasElement*, ScriptState*, WebGLContextAttributes, unsigned);
+    void texImageCanvasByGPU(HTMLCanvasElement*, GLuint, GLenum, GLenum, GLint);
+    void texImageBitmapByGPU(ImageBitmap*, GLuint, GLenum, GLenum, GLint);
 };
 
 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