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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GLREADTEXIMAGEHELPER_H_
#define GLREADTEXIMAGEHELPER_H_
#include "GLContextTypes.h"
#include "nsSize.h"
#include "mozilla/AlreadyAddRefed.h"
#include "mozilla/gfx/MatrixFwd.h"
#include "mozilla/gfx/Types.h"
namespace mozilla {
namespace gfx {
class DataSourceSurface;
} // namespace gfx
namespace gl {
// Returns true if the `dest{Format,Type}` are the same as the
// `read{Format,Type}`.
bool GetActualReadFormats(GLContext* gl, GLenum destFormat, GLenum destType,
GLenum* out_readFormat, GLenum* out_readType);
void ReadPixelsIntoBuffer(GLContext* gl, uint8_t* aData, int32_t aStride,
const gfx::IntSize& aSize,
gfx::SurfaceFormat aFormat);
void ReadPixelsIntoDataSurface(GLContext* aGL,
gfx::DataSourceSurface* aSurface);
already_AddRefed<gfx::DataSourceSurface> ReadBackSurface(
GLContext* gl, GLuint aTexture, bool aYInvert, gfx::SurfaceFormat aFormat);
already_AddRefed<gfx::DataSourceSurface> YInvertImageSurface(
gfx::DataSourceSurface* aSurf, uint32_t aStride);
void SwapRAndBComponents(gfx::DataSourceSurface* surf);
class GLReadTexImageHelper final {
// The GLContext is the sole owner of the GLBlitHelper.
GLContext* mGL;
GLuint mPrograms[4];
GLuint TextureImageProgramFor(GLenum aTextureTarget, int aShader);
bool DidGLErrorOccur(const char* str);
public:
explicit GLReadTexImageHelper(GLContext* gl);
~GLReadTexImageHelper();
/**
* Read the image data contained in aTexture, and return it as an
* ImageSurface. If GL_RGBA is given as the format, a
* SurfaceFormat::A8R8G8B8_UINT32 surface is returned. Not implemented yet: If
* GL_RGB is given as the format, a SurfaceFormat::X8R8G8B8_UINT32 surface is
* returned. If GL_LUMINANCE is given as the format, a SurfaceFormat::A8
* surface is returned.
*
* THIS IS EXPENSIVE. It is ridiculously expensive. Only do this
* if you absolutely positively must, and never in any performance
* critical path.
*
* NOTE: aShaderProgram is really mozilla::layers::ShaderProgramType. It is
* passed as int to eliminate including LayerManagerOGLProgram.h here.
*/
already_AddRefed<gfx::DataSourceSurface> ReadTexImage(
GLuint aTextureId, GLenum aTextureTarget, const gfx::IntSize& aSize,
const gfx::Matrix4x4& aTexMatrix,
/* ShaderProgramType */ int aShaderProgram, bool aYInvert = false);
bool ReadTexImage(gfx::DataSourceSurface* aDest, GLuint aTextureId,
GLenum aTextureTarget, const gfx::IntSize& aSize,
const gfx::Matrix4x4& aTexMatrix, int aShaderProgram,
bool aYInvert = false);
};
} // namespace gl
} // namespace mozilla
#endif
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