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