Support uploads of sub-rectangles of canvases to 2D and 3D textures.

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 1005 matching lines @@
                     GLint zoffset,
                     GLenum format,
                     GLenum type,
                     Image*,
                     WebGLImageConversion::ImageHtmlDomSource,
                     bool flipY,
                     bool premultiplyAlpha,
                     const IntRect&,
                     GLsizei depth,
                     GLint unpackImageHeight);
+
+  template <typename T>
+  IntRect getTextureSourceSize(T* textureSource) {
+    return IntRect(0, 0, textureSource->width(), textureSource->height());
+  }
+
   template <typename T>
   bool validateTexImageSubRectangle(const char* functionName,
                                     TexImageFunctionID functionID,
                                     T* image,
                                     const IntRect& subRect,
                                     GLsizei depth,
                                     GLint unpackImageHeight,
                                     bool* selectingSubRectangle) {
     DCHECK(functionName);
     DCHECK(selectingSubRectangle);
@@ skipping 40 matching lines @@
         return false;
       }
     } else {
       DCHECK_EQ(depth, 1);
       DCHECK_EQ(unpackImageHeight, 0);
     }
     return true;
   }
 
   // Copy from the source directly to the texture via the gpu, without a
-  // read-back to system memory.  Souce could be canvas or imageBitmap.
+  // read-back to system memory.  Source could be canvas or imageBitmap.
   void texImageByGPU(TexImageByGPUType,
                      WebGLTexture*,
                      GLenum target,
                      GLint level,
                      GLint internalformat,
                      GLenum type,
                      GLint xoffset,
                      GLint yoffset,
                      GLint zoffset,
-                     CanvasImageSource*);
+                     CanvasImageSource*,
+                     const IntRect& sourceSubRectangle);
   virtual bool canUseTexImageByGPU(TexImageFunctionID,
                                    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
@@ skipping 452 matching lines @@
   void texImageHelperHTMLCanvasElement(TexImageFunctionID,
                                        GLenum,
                                        GLint,
                                        GLint,
                                        GLenum,
                                        GLenum,
                                        GLint,
                                        GLint,
                                        GLint,
                                        HTMLCanvasElement*,
+                                       const IntRect&,
+                                       GLsizei,
+                                       GLint,
                                        ExceptionState&);
   void texImageHelperHTMLVideoElement(TexImageFunctionID,
                                       GLenum,
                                       GLint,
                                       GLint,
                                       GLenum,
                                       GLenum,
                                       GLint,
                                       GLint,
                                       GLint,
@@ skipping 29 matching lines @@
   WebGLRenderingContextBase(HTMLCanvasElement*,
                             OffscreenCanvas*,
                             std::unique_ptr<WebGraphicsContext3DProvider>,
                             const CanvasContextCreationAttributes&,
                             unsigned);
   static std::unique_ptr<WebGraphicsContext3DProvider>
   createContextProviderInternal(HTMLCanvasElement*,
                                 ScriptState*,
                                 const CanvasContextCreationAttributes&,
                                 unsigned);
-  void texImageCanvasByGPU(HTMLCanvasElement*, GLuint, GLenum, GLenum, GLint);
+  void texImageCanvasByGPU(HTMLCanvasElement*,
+                           GLuint,
+                           GLenum,
+                           GLenum,
+                           GLint,
+                           GLint,
+                           GLint,
+                           const IntRect& sourceSubRectangle);
   void texImageBitmapByGPU(ImageBitmap*, GLuint, GLenum, GLenum, GLint, bool);
 
   const unsigned m_version;
 
   bool isPaintable() const final { return drawingBuffer(); }
 };
 
 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