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 GLREADTEXIMAGEHELPER_H_
michael@0: #define GLREADTEXIMAGEHELPER_H_
michael@0: 
michael@0: #include "GLContextTypes.h"
michael@0: #include "mozilla/Attributes.h"
michael@0: #include "nsSize.h"
michael@0: #include "nsAutoPtr.h"
michael@0: #include "mozilla/RefPtr.h"
michael@0: #include "mozilla/gfx/Types.h"
michael@0: 
michael@0: class gfxImageSurface;
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: namespace gfx {
michael@0: class DataSourceSurface;
michael@0: }
michael@0: 
michael@0: namespace gl {
michael@0: 
michael@0: void ReadPixelsIntoImageSurface(GLContext* aGL, gfxImageSurface* aSurface);
michael@0: void ReadScreenIntoImageSurface(GLContext* aGL, gfxImageSurface* aSurface);
michael@0: 
michael@0: TemporaryRef<gfx::DataSourceSurface>
michael@0: ReadBackSurface(GLContext* gl, GLuint aTexture, bool aYInvert, gfx::SurfaceFormat aFormat);
michael@0: 
michael@0: class GLReadTexImageHelper MOZ_FINAL
michael@0: {
michael@0:     // The GLContext is the sole owner of the GLBlitHelper.
michael@0:     GLContext* mGL;
michael@0: 
michael@0:     GLuint mPrograms[4];
michael@0: 
michael@0:     GLuint TextureImageProgramFor(GLenum aTextureTarget, int aShader);
michael@0: 
michael@0:     bool DidGLErrorOccur(const char* str);
michael@0: 
michael@0: public:
michael@0: 
michael@0:     GLReadTexImageHelper(GLContext* gl);
michael@0:     ~GLReadTexImageHelper();
michael@0: 
michael@0:     /**
michael@0:       * Read the image data contained in aTexture, and return it as an ImageSurface.
michael@0:       * If GL_RGBA is given as the format, a gfxImageFormat::ARGB32 surface is returned.
michael@0:       * Not implemented yet:
michael@0:       * If GL_RGB is given as the format, a gfxImageFormat::RGB24 surface is returned.
michael@0:       * If GL_LUMINANCE is given as the format, a gfxImageFormat::A8 surface is returned.
michael@0:       *
michael@0:       * THIS IS EXPENSIVE.  It is ridiculously expensive.  Only do this
michael@0:       * if you absolutely positively must, and never in any performance
michael@0:       * critical path.
michael@0:       *
michael@0:       * NOTE: aShaderProgram is really mozilla::layers::ShaderProgramType. It is
michael@0:       * passed as int to eliminate including LayerManagerOGLProgram.h here.
michael@0:       */
michael@0:     TemporaryRef<gfx::DataSourceSurface> ReadTexImage(GLuint aTextureId,
michael@0:                                                       GLenum aTextureTarget,
michael@0:                                                       const gfx::IntSize& aSize,
michael@0:                               /* ShaderProgramType */ int aShaderProgram,
michael@0:                                                       bool aYInvert = false);
michael@0: 
michael@0: 
michael@0: };
michael@0: 
michael@0: }
michael@0: }
michael@0: 
michael@0: #endif