Save/restore PBO bindings in DrawingBuffer

third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h

 /*
  * Copyright (c) 2010, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 118 matching lines @@
 
     // commit should copy the full multisample buffer, and not respect the
     // current scissor bounds. Track the state of the scissor test so that it
     // can be disabled during calls to commit.
     void setScissorEnabled(bool scissorEnabled) { m_scissorEnabled = scissorEnabled; }
 
     // The DrawingBuffer needs to track the texture bound to texture unit 0.
     // The bound texture is tracked to avoid costly queries during rendering.
     void setTexture2DBinding(GLuint texture) { m_texture2DBinding = texture; }
 
+    void setPixelUnpackBufferBinding(GLuint buffer)
+    {
+        DCHECK(m_webGLVersion > WebGL1);
+        m_pixelUnpackBufferBinding = buffer;
+    }
+
+    void notifyBufferDeleted(GLuint buffer)
+    {
+        if (m_webGLVersion > WebGL1 && buffer == m_pixelUnpackBufferBinding) {
+            setPixelUnpackBufferBinding(0);
+        }
+    }
+
     // The DrawingBuffer needs to track the currently bound framebuffer so it
     // restore the binding when needed.
     void setFramebufferBinding(GLenum target, GLuint fbo)
     {
         switch (target) {
         case GL_FRAMEBUFFER:
             m_drawFramebufferBinding = fbo;
             m_readFramebufferBinding = fbo;
             break;
         case GL_DRAW_FRAMEBUFFER:
@@ skipping 71 matching lines @@
     bool copyToPlatformTexture(gpu::gles2::GLES2Interface*, GLuint texture, GLenum internalFormat,
         GLenum destType, GLint level, bool premultiplyAlpha, bool flipY, SourceDrawingBuffer);
 
     void setPackAlignment(GLint param);
 
     bool paintRenderingResultsToImageData(int&, int&, SourceDrawingBuffer, WTF::ArrayBufferContents&);
 
     int sampleCount() const { return m_sampleCount; }
     bool explicitResolveOfMultisampleData() const { return m_antiAliasingMode == MSAAExplicitResolve; }
 
+    void restorePixelUnpackBufferBindings();
+
     // Bind to m_drawFramebufferBinding or m_readFramebufferBinding if it's not 0.
     // Otherwise, bind to the default FBO.
     void restoreFramebufferBindings();
 
     void restoreTextureBindings();
 
     void addNewMailboxCallback(std::unique_ptr<WTF::Closure> closure) { m_newMailboxCallback = std::move(closure); }
 
 protected: // For unittests
     DrawingBuffer(
@@ skipping 130 matching lines @@
     // Whether the WebGL client wants a depth or stencil buffer.
     bool wantDepthOrStencil();
 
     // The format to use when creating a multisampled renderbuffer.
     GLenum getMultisampledRenderbufferFormat();
 
     const PreserveDrawingBuffer m_preserveDrawingBuffer;
     const WebGLVersion m_webGLVersion;
     bool m_scissorEnabled = false;
     GLuint m_texture2DBinding = 0;
+    GLuint m_pixelUnpackBufferBinding = 0;
     GLuint m_drawFramebufferBinding = 0;
     GLuint m_readFramebufferBinding = 0;
     GLuint m_renderbufferBinding = 0;
     GLenum m_activeTextureUnit = GL_TEXTURE0;
     GLfloat m_clearColor[4];
     GLboolean m_colorMask[4];
 
     std::unique_ptr<WebGraphicsContext3DProvider> m_contextProvider;
     // Lifetime is tied to the m_contextProvider.
     gpu::gles2::GLES2Interface* m_gl;
@@ skipping 93 matching lines @@
     // used to resize the Canvas.
     SkBitmap m_resizingBitmap;
 
     // Used to flip a bitmap vertically.
     Vector<uint8_t> m_scanline;
 };
 
 } // namespace blink
 
 #endif // DrawingBuffer_h