diff -r 000000000000 -r 6474c204b198 gfx/gl/GLBlitHelper.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/gl/GLBlitHelper.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,116 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim: set ts=8 sts=4 et sw=4 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 GLBLITHELPER_H_
+#define GLBLITHELPER_H_
+
+#include "GLContextTypes.h"
+#include "GLConsts.h"
+#include "nsSize.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/gfx/Point.h"
+
+namespace mozilla {
+namespace gl {
+
+class GLContext;
+
+/**
+ * Helper function that creates a 2D texture aSize.width x aSize.height with
+ * storage type specified by aFormats. Returns GL texture object id.
+ *
+ * See mozilla::gl::CreateTexture.
+ */
+GLuint CreateTextureForOffscreen(GLContext* aGL, const GLFormats& aFormats,
+                                 const gfx::IntSize& aSize);
+
+/**
+ * Helper function that creates a 2D texture aSize.width x aSize.height with
+ * storage type aInternalFormat. Returns GL texture object id.
+ *
+ * Initialize textyre parameters to:
+ *    GL_TEXTURE_MIN_FILTER = GL_LINEAR
+ *    GL_TEXTURE_MAG_FILTER = GL_LINEAR
+ *    GL_TEXTURE_WRAP_S = GL_CLAMP_TO_EDGE
+ *    GL_TEXTURE_WRAP_T = GL_CLAMP_TO_EDGE
+ */
+GLuint CreateTexture(GLContext* aGL, GLenum aInternalFormat, GLenum aFormat,
+                     GLenum aType, const gfx::IntSize& aSize);
+
+/**
+ * Helper function to create, potentially, multisample render buffers suitable
+ * for offscreen rendering. Buffers of size aSize.width x aSize.height with
+ * storage specified by aFormat. returns GL render buffer object id.
+ */
+GLuint CreateRenderbuffer(GLContext* aGL, GLenum aFormat, GLsizei aSamples,
+                          const gfx::IntSize& aSize);
+
+/**
+ * Helper function to create, potentially, multisample render buffers suitable
+ * for offscreen rendering. Buffers of size aSize.width x aSize.height with
+ * storage specified by aFormats. GL render buffer object ids are returned via
+ * aColorMSRB, aDepthRB, and aStencilRB
+ */
+void CreateRenderbuffersForOffscreen(GLContext* aGL, const GLFormats& aFormats,
+                                     const gfx::IntSize& aSize, bool aMultisample,
+                                     GLuint* aColorMSRB, GLuint* aDepthRB,
+                                     GLuint* aStencilRB);
+
+
+/** Buffer blitting helper */
+class GLBlitHelper MOZ_FINAL
+{
+    // The GLContext is the sole owner of the GLBlitHelper.
+    GLContext* mGL;
+
+    GLuint mTexBlit_Buffer;
+    GLuint mTexBlit_VertShader;
+    GLuint mTex2DBlit_FragShader;
+    GLuint mTex2DRectBlit_FragShader;
+    GLuint mTex2DBlit_Program;
+    GLuint mTex2DRectBlit_Program;
+
+    void UseBlitProgram();
+    void SetBlitFramebufferForDestTexture(GLuint aTexture);
+
+    bool UseTexQuadProgram(GLenum target, const gfx::IntSize& srcSize);
+    bool InitTexQuadProgram(GLenum target = LOCAL_GL_TEXTURE_2D);
+    void DeleteTexBlitProgram();
+
+public:
+
+    GLBlitHelper(GLContext* gl);
+    ~GLBlitHelper();
+
+    // If you don't have |srcFormats| for the 2nd definition,
+    // then you'll need the framebuffer_blit extensions to use
+    // the first BlitFramebufferToFramebuffer.
+    void BlitFramebufferToFramebuffer(GLuint srcFB, GLuint destFB,
+                                      const gfx::IntSize& srcSize,
+                                      const gfx::IntSize& destSize);
+    void BlitFramebufferToFramebuffer(GLuint srcFB, GLuint destFB,
+                                      const gfx::IntSize& srcSize,
+                                      const gfx::IntSize& destSize,
+                                      const GLFormats& srcFormats);
+    void BlitTextureToFramebuffer(GLuint srcTex, GLuint destFB,
+                                  const gfx::IntSize& srcSize,
+                                  const gfx::IntSize& destSize,
+                                  GLenum srcTarget = LOCAL_GL_TEXTURE_2D);
+    void BlitFramebufferToTexture(GLuint srcFB, GLuint destTex,
+                                  const gfx::IntSize& srcSize,
+                                  const gfx::IntSize& destSize,
+                                  GLenum destTarget = LOCAL_GL_TEXTURE_2D);
+    void BlitTextureToTexture(GLuint srcTex, GLuint destTex,
+                              const gfx::IntSize& srcSize,
+                              const gfx::IntSize& destSize,
+                              GLenum srcTarget = LOCAL_GL_TEXTURE_2D,
+                              GLenum destTarget = LOCAL_GL_TEXTURE_2D);
+};
+
+}
+}
+
+#endif // GLBLITHELPER_H_