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72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim: set ts=8 sts=4 et sw=4 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GLBLITTEXTUREIMAGEHELPER_H_
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#define GLBLITTEXTUREIMAGEHELPER_H_
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#include "mozilla/Attributes.h"
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#include "GLContextTypes.h"
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#include "GLConsts.h"
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#include "mozilla/gfx/Rect.h"
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namespace mozilla {
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namespace gl {
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class GLContext;
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class TextureImage;
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} // namespace gl
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namespace layers {
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class CompositorOGL;
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class GLBlitTextureImageHelper final
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{
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// The GLContext is the sole owner of the GLBlitTextureImageHelper.
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CompositorOGL* mCompositor;
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// lazy-initialized things
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GLuint mBlitProgram, mBlitFramebuffer;
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void UseBlitProgram();
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void SetBlitFramebufferForDestTexture(GLuint aTexture);
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public:
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explicit GLBlitTextureImageHelper(CompositorOGL *gl);
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~GLBlitTextureImageHelper();
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/**
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* Copy a rectangle from one TextureImage into another. The
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* source and destination are given in integer coordinates, and
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* will be converted to texture coordinates.
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*
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* For the source texture, the wrap modes DO apply -- it's valid
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* to use REPEAT or PAD and expect appropriate behaviour if the source
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* rectangle extends beyond its bounds.
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*
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* For the destination texture, the wrap modes DO NOT apply -- the
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* destination will be clipped by the bounds of the texture.
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*
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* Note: calling this function will cause the following OpenGL state
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* to be changed:
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*
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* - current program
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* - framebuffer binding
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* - viewport
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* - blend state (will be enabled at end)
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* - scissor state (will be enabled at end)
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* - vertex attrib 0 and 1 (pointer and enable state [enable state will be disabled at exit])
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* - array buffer binding (will be 0)
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* - active texture (will be 0)
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* - texture 0 binding
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*/
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void BlitTextureImage(gl::TextureImage *aSrc, const gfx::IntRect& aSrcRect,
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gl::TextureImage *aDst, const gfx::IntRect& aDstRect);
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};
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} // namespace layers
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} // namespace mozilla
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#endif // GLBLITTEXTUREIMAGEHELPER_H_
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