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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_COMMON_GPU_CLIENT_GL_HELPER_H_
#define CONTENT_COMMON_GPU_CLIENT_GL_HELPER_H_
#include "base/atomicops.h"
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/memory/scoped_ptr.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebGraphicsContext3D.h"
namespace gfx {
class Rect;
class Size;
}
namespace content {
// Provides higher level operations on top of the WebKit::WebGraphicsContext3D
// interfaces.
class GLHelper {
public:
GLHelper(WebKit::WebGraphicsContext3D* context,
WebKit::WebGraphicsContext3D* context_for_thread);
virtual ~GLHelper();
WebKit::WebGraphicsContext3D* context() const;
// Copies the block of pixels specified with |src_subrect| from |src_texture|,
// scales it to |dst_size|, and writes it into |out|.
// |src_size| is the size of |src_texture|. The result is of format GL_BGRA
// and is potentially flipped vertically to make it a correct image
// representation. |callback| is invoked with the copy result when the copy
// operation has completed.
void CropScaleReadbackAndCleanTexture(
WebKit::WebGLId src_texture,
const gfx::Size& src_size,
const gfx::Rect& src_subrect,
const gfx::Size& dst_size,
unsigned char* out,
const base::Callback<void(bool)>& callback);
// Copies the texture data out of |texture| into |out|. |size| is the
// size of the texture. No post processing is applied to the pixels. The
// texture is assumed to have a format of GL_RGBA with a pixel type of
// GL_UNSIGNED_BYTE. This is a blocking call that calls glReadPixels on this
// current context.
void ReadbackTextureSync(WebKit::WebGLId texture,
const gfx::Size& size,
unsigned char* out);
// Creates a copy of the specified texture. |size| is the size of the texture.
WebKit::WebGLId CopyTexture(WebKit::WebGLId texture,
const gfx::Size& size);
// Creates a scaled copy of the specified texture. |src_size| is the size of
// the texture and |dst_size| is the size of the resulting copy.
WebKit::WebGLId CopyAndScaleTexture(WebKit::WebGLId texture,
const gfx::Size& src_size,
const gfx::Size& dst_size,
bool vertically_flip_texture);
// Returns the shader compiled from the source.
WebKit::WebGLId CompileShaderFromSource(const WebKit::WGC3Dchar* source,
WebKit::WGC3Denum type);
private:
class CopyTextureToImpl;
// Creates |copy_texture_to_impl_| if NULL.
void InitCopyTextToImpl();
WebKit::WebGraphicsContext3D* context_;
WebKit::WebGraphicsContext3D* context_for_thread_;
scoped_ptr<CopyTextureToImpl> copy_texture_to_impl_;
// The number of all GLHelper instances.
static base::subtle::Atomic32 count_;
DISALLOW_COPY_AND_ASSIGN(GLHelper);
};
} // namespace content
#endif // CONTENT_COMMON_GPU_CLIENT_GL_HELPER_H_
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