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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 GLBLITTEXTUREIMAGEHELPER_H_
#define GLBLITTEXTUREIMAGEHELPER_H_
#include "mozilla/Attributes.h"
#include "GLContextTypes.h"
#include "GLConsts.h"
#include "mozilla/gfx/Rect.h"
namespace mozilla {
namespace gl {
class GLContext;
class TextureImage;
} // namespace gl
namespace layers {
class CompositorOGL;
class GLBlitTextureImageHelper final
{
// The GLContext is the sole owner of the GLBlitTextureImageHelper.
CompositorOGL* mCompositor;
// lazy-initialized things
GLuint mBlitProgram, mBlitFramebuffer;
void UseBlitProgram();
void SetBlitFramebufferForDestTexture(GLuint aTexture);
public:
explicit GLBlitTextureImageHelper(CompositorOGL *gl);
~GLBlitTextureImageHelper();
/**
* Copy a rectangle from one TextureImage into another. The
* source and destination are given in integer coordinates, and
* will be converted to texture coordinates.
*
* For the source texture, the wrap modes DO apply -- it's valid
* to use REPEAT or PAD and expect appropriate behaviour if the source
* rectangle extends beyond its bounds.
*
* For the destination texture, the wrap modes DO NOT apply -- the
* destination will be clipped by the bounds of the texture.
*
* Note: calling this function will cause the following OpenGL state
* to be changed:
*
* - current program
* - framebuffer binding
* - viewport
* - blend state (will be enabled at end)
* - scissor state (will be enabled at end)
* - vertex attrib 0 and 1 (pointer and enable state [enable state will be disabled at exit])
* - array buffer binding (will be 0)
* - active texture (will be 0)
* - texture 0 binding
*/
void BlitTextureImage(gl::TextureImage *aSrc, const gfx::IntRect& aSrcRect,
gl::TextureImage *aDst, const gfx::IntRect& aDstRect);
};
} // namespace layers
} // namespace mozilla
#endif // GLBLITTEXTUREIMAGEHELPER_H_
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