The Tor Browser: gfx/gl/GLBlitHelper.cpp@97036ab72558 (annotated)

gfx/gl/GLBlitHelper.cpp@97036ab72558 (annotated)

gfx/gl/GLBlitHelper.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- 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/. */
 #include "GLBlitHelper.h"
 #include "GLContext.h"
 #include "ScopedGLHelpers.h"
 #include "mozilla/Preferences.h"
 namespace mozilla {
 namespace gl {
 static void
 RenderbufferStorageBySamples(GLContext* aGL, GLsizei aSamples,
                              GLenum aInternalFormat, const gfx::IntSize& aSize)
 {
     if (aSamples) {
         aGL->fRenderbufferStorageMultisample(LOCAL_GL_RENDERBUFFER,
                                              aSamples,
                                              aInternalFormat,
                                              aSize.width, aSize.height);
     } else {
         aGL->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER,
                                   aInternalFormat,
                                   aSize.width, aSize.height);
     }
 }
 GLuint
 CreateTexture(GLContext* aGL, GLenum aInternalFormat, GLenum aFormat,
               GLenum aType, const gfx::IntSize& aSize)
 {
     GLuint tex = 0;
     aGL->fGenTextures(1, &tex);
     ScopedBindTexture autoTex(aGL, tex);
     aGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_MIN_FILTER, LOCAL_GL_LINEAR);
     aGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_MAG_FILTER, LOCAL_GL_LINEAR);
     aGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_WRAP_S, LOCAL_GL_CLAMP_TO_EDGE);
     aGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_WRAP_T, LOCAL_GL_CLAMP_TO_EDGE);
     aGL->fTexImage2D(LOCAL_GL_TEXTURE_2D,
 ,
                      aInternalFormat,
                      aSize.width, aSize.height,
 ,
                      aFormat,
                      aType,
                      nullptr);
     return tex;
 }
 GLuint
 CreateTextureForOffscreen(GLContext* aGL, const GLFormats& aFormats,
                           const gfx::IntSize& aSize)
 {
     MOZ_ASSERT(aFormats.color_texInternalFormat);
     MOZ_ASSERT(aFormats.color_texFormat);
     MOZ_ASSERT(aFormats.color_texType);
     return CreateTexture(aGL,
                          aFormats.color_texInternalFormat,
                          aFormats.color_texFormat,
                          aFormats.color_texType,
                          aSize);
 }
 GLuint
 CreateRenderbuffer(GLContext* aGL, GLenum aFormat, GLsizei aSamples,
                    const gfx::IntSize& aSize)
 {
     GLuint rb = 0;
     aGL->fGenRenderbuffers(1, &rb);
     ScopedBindRenderbuffer autoRB(aGL, rb);
     RenderbufferStorageBySamples(aGL, aSamples, aFormat, aSize);
     return rb;
 }
 void
 CreateRenderbuffersForOffscreen(GLContext* aGL, const GLFormats& aFormats,
                                 const gfx::IntSize& aSize, bool aMultisample,
                                 GLuint* aColorMSRB, GLuint* aDepthRB,
                                 GLuint* aStencilRB)
 {
     GLsizei samples = aMultisample ? aFormats.samples : 0;
     if (aColorMSRB) {
         MOZ_ASSERT(aFormats.samples > 0);
         MOZ_ASSERT(aFormats.color_rbFormat);
         *aColorMSRB = CreateRenderbuffer(aGL, aFormats.color_rbFormat, samples, aSize);
     }
     if (aDepthRB &&
         aStencilRB &&
         aFormats.depthStencil)
     {
         *aDepthRB = CreateRenderbuffer(aGL, aFormats.depthStencil, samples, aSize);
         *aStencilRB = *aDepthRB;
     } else {
         if (aDepthRB) {
             MOZ_ASSERT(aFormats.depth);
             *aDepthRB = CreateRenderbuffer(aGL, aFormats.depth, samples, aSize);
         }
         if (aStencilRB) {
             MOZ_ASSERT(aFormats.stencil);
             *aStencilRB = CreateRenderbuffer(aGL, aFormats.stencil, samples, aSize);
         }
     }
 }
 GLBlitHelper::GLBlitHelper(GLContext* gl)
     : mGL(gl)
     , mTexBlit_Buffer(0)
     , mTexBlit_VertShader(0)
     , mTex2DBlit_FragShader(0)
     , mTex2DRectBlit_FragShader(0)
     , mTex2DBlit_Program(0)
     , mTex2DRectBlit_Program(0)
 {
 }
 GLBlitHelper::~GLBlitHelper()
 {
     DeleteTexBlitProgram();
 }
 // Allowed to be destructive of state we restore in functions below.
 bool
 GLBlitHelper::InitTexQuadProgram(GLenum target)
 {
     const char kTexBlit_VertShaderSource[] = "\
     attribute vec2 aPosition;                   \n\
                                                 \n\
     varying vec2 vTexCoord;                     \n\
                                                 \n\
     void main(void) {                           \n\
         vTexCoord = aPosition;                  \n\
         vec2 vertPos = aPosition * 2.0 - 1.0;   \n\
         gl_Position = vec4(vertPos, 0.0, 1.0);  \n\
     }                                           \n\
     ";
     const char kTex2DBlit_FragShaderSource[] = "\
     #ifdef GL_FRAGMENT_PRECISION_HIGH                   \n\
         precision highp float;                          \n\
     #else                                               \n\
         precision mediump float;                        \n\
     #endif                                              \n\
                                                         \n\
     uniform sampler2D uTexUnit;                         \n\
                                                         \n\
     varying vec2 vTexCoord;                             \n\
                                                         \n\
     void main(void) {                                   \n\
         gl_FragColor = texture2D(uTexUnit, vTexCoord);  \n\
     }                                                   \n\
     ";
     const char kTex2DRectBlit_FragShaderSource[] = "\
     #ifdef GL_FRAGMENT_PRECISION_HIGH                             \n\
         precision highp float;                                    \n\
     #else                                                         \n\
         precision mediump float;                                  \n\
     #endif                                                        \n\
                                                                   \n\
     uniform sampler2D uTexUnit;                                   \n\
     uniform vec2 uTexCoordMult;                                   \n\
                                                                   \n\
     varying vec2 vTexCoord;                                       \n\
                                                                   \n\
     void main(void) {                                             \n\
         gl_FragColor = texture2DRect(uTexUnit,                    \n\
                                     vTexCoord * uTexCoordMult);  \n\
     }                                                             \n\
     ";
     MOZ_ASSERT(target == LOCAL_GL_TEXTURE_2D ||
                target == LOCAL_GL_TEXTURE_RECTANGLE_ARB);
     bool success = false;
     GLuint *programPtr;
     GLuint *fragShaderPtr;
     const char* fragShaderSource;
     if (target == LOCAL_GL_TEXTURE_2D) {
         programPtr = &mTex2DBlit_Program;
         fragShaderPtr = &mTex2DBlit_FragShader;
         fragShaderSource = kTex2DBlit_FragShaderSource;
     } else {
         programPtr = &mTex2DRectBlit_Program;
         fragShaderPtr = &mTex2DRectBlit_FragShader;
         fragShaderSource = kTex2DRectBlit_FragShaderSource;
     }
     GLuint& program = *programPtr;
     GLuint& fragShader = *fragShaderPtr;
     // Use do-while(false) to let us break on failure
     do {
         if (program) {
             // Already have it...
             success = true;
             break;
         }
         if (!mTexBlit_Buffer) {
             /* CCW tri-strip:
              * 2---3
              * | \ |
              * 0---1
              */
             GLfloat verts[] = {
 .0f, 0.0f,
 .0f, 0.0f,
 .0f, 1.0f,
 .0f, 1.0f
             };
             MOZ_ASSERT(!mTexBlit_Buffer);
             mGL->fGenBuffers(1, &mTexBlit_Buffer);
             mGL->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, mTexBlit_Buffer);
             const size_t vertsSize = sizeof(verts);
             // Make sure we have a sane size.
             MOZ_ASSERT(vertsSize >= 3 * sizeof(GLfloat));
             mGL->fBufferData(LOCAL_GL_ARRAY_BUFFER, vertsSize, verts, LOCAL_GL_STATIC_DRAW);
         }
         if (!mTexBlit_VertShader) {
             const char* vertShaderSource = kTexBlit_VertShaderSource;
             mTexBlit_VertShader = mGL->fCreateShader(LOCAL_GL_VERTEX_SHADER);
             mGL->fShaderSource(mTexBlit_VertShader, 1, &vertShaderSource, nullptr);
             mGL->fCompileShader(mTexBlit_VertShader);
         }
         MOZ_ASSERT(!fragShader);
         fragShader = mGL->fCreateShader(LOCAL_GL_FRAGMENT_SHADER);
         mGL->fShaderSource(fragShader, 1, &fragShaderSource, nullptr);
         mGL->fCompileShader(fragShader);
         program = mGL->fCreateProgram();
         mGL->fAttachShader(program, mTexBlit_VertShader);
         mGL->fAttachShader(program, fragShader);
         mGL->fBindAttribLocation(program, 0, "aPosition");
         mGL->fLinkProgram(program);
         if (mGL->DebugMode()) {
             GLint status = 0;
             mGL->fGetShaderiv(mTexBlit_VertShader, LOCAL_GL_COMPILE_STATUS, &status);
             if (status != LOCAL_GL_TRUE) {
                 NS_ERROR("Vert shader compilation failed.");
                 GLint length = 0;
                 mGL->fGetShaderiv(mTexBlit_VertShader, LOCAL_GL_INFO_LOG_LENGTH, &length);
                 if (!length) {
                     printf_stderr("No shader info log available.\n");
                     break;
                 }
                 nsAutoArrayPtr<char> buffer(new char[length]);
                 mGL->fGetShaderInfoLog(mTexBlit_VertShader, length, nullptr, buffer);
                 printf_stderr("Shader info log (%d bytes): %s\n", length, buffer.get());
                 break;
             }
             status = 0;
             mGL->fGetShaderiv(fragShader, LOCAL_GL_COMPILE_STATUS, &status);
             if (status != LOCAL_GL_TRUE) {
                 NS_ERROR("Frag shader compilation failed.");
                 GLint length = 0;
                 mGL->fGetShaderiv(fragShader, LOCAL_GL_INFO_LOG_LENGTH, &length);
                 if (!length) {
                     printf_stderr("No shader info log available.\n");
                     break;
                 }
                 nsAutoArrayPtr<char> buffer(new char[length]);
                 mGL->fGetShaderInfoLog(fragShader, length, nullptr, buffer);
                 printf_stderr("Shader info log (%d bytes): %s\n", length, buffer.get());
                 break;
             }
         }
         GLint status = 0;
         mGL->fGetProgramiv(program, LOCAL_GL_LINK_STATUS, &status);
         if (status != LOCAL_GL_TRUE) {
             if (mGL->DebugMode()) {
                 NS_ERROR("Linking blit program failed.");
                 GLint length = 0;
                 mGL->fGetProgramiv(program, LOCAL_GL_INFO_LOG_LENGTH, &length);
                 if (!length) {
                     printf_stderr("No program info log available.\n");
                     break;
                 }
                 nsAutoArrayPtr<char> buffer(new char[length]);
                 mGL->fGetProgramInfoLog(program, length, nullptr, buffer);
                 printf_stderr("Program info log (%d bytes): %s\n", length, buffer.get());
             }
             break;
         }
         MOZ_ASSERT(mGL->fGetAttribLocation(program, "aPosition") == 0);
         GLint texUnitLoc = mGL->fGetUniformLocation(program, "uTexUnit");
         MOZ_ASSERT(texUnitLoc != -1, "uniform not found");
         // Set uniforms here:
         mGL->fUseProgram(program);
         mGL->fUniform1i(texUnitLoc, 0);
         success = true;
     } while (false);
     if (!success) {
         NS_ERROR("Creating program for texture blit failed!");
         // Clean up:
         DeleteTexBlitProgram();
         return false;
     }
     mGL->fUseProgram(program);
     mGL->fEnableVertexAttribArray(0);
     mGL->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, mTexBlit_Buffer);
     mGL->fVertexAttribPointer(0,
 ,
                               LOCAL_GL_FLOAT,
                               false,
 ,
                               nullptr);
     return true;
 }
 bool
 GLBlitHelper::UseTexQuadProgram(GLenum target, const gfx::IntSize& srcSize)
 {
     if (!InitTexQuadProgram(target)) {
         return false;
     }
     if (target == LOCAL_GL_TEXTURE_RECTANGLE_ARB) {
         GLint texCoordMultLoc = mGL->fGetUniformLocation(mTex2DRectBlit_Program, "uTexCoordMult");
         MOZ_ASSERT(texCoordMultLoc != -1, "uniform not found");
         mGL->fUniform2f(texCoordMultLoc, srcSize.width, srcSize.height);
     }
     return true;
 }
 void
 GLBlitHelper::DeleteTexBlitProgram()
 {
     if (mTexBlit_Buffer) {
         mGL->fDeleteBuffers(1, &mTexBlit_Buffer);
         mTexBlit_Buffer = 0;
     }
     if (mTexBlit_VertShader) {
         mGL->fDeleteShader(mTexBlit_VertShader);
         mTexBlit_VertShader = 0;
     }
     if (mTex2DBlit_FragShader) {
         mGL->fDeleteShader(mTex2DBlit_FragShader);
         mTex2DBlit_FragShader = 0;
     }
     if (mTex2DRectBlit_FragShader) {
         mGL->fDeleteShader(mTex2DRectBlit_FragShader);
         mTex2DRectBlit_FragShader = 0;
     }
     if (mTex2DBlit_Program) {
         mGL->fDeleteProgram(mTex2DBlit_Program);
         mTex2DBlit_Program = 0;
     }
     if (mTex2DRectBlit_Program) {
         mGL->fDeleteProgram(mTex2DRectBlit_Program);
         mTex2DRectBlit_Program = 0;
     }
 }
 void
 GLBlitHelper::BlitFramebufferToFramebuffer(GLuint srcFB, GLuint destFB,
                                         const gfx::IntSize& srcSize,
                                         const gfx::IntSize& destSize)
 {
     MOZ_ASSERT(!srcFB || mGL->fIsFramebuffer(srcFB));
     MOZ_ASSERT(!destFB || mGL->fIsFramebuffer(destFB));
     MOZ_ASSERT(mGL->IsSupported(GLFeature::framebuffer_blit));
     ScopedBindFramebuffer boundFB(mGL);
     ScopedGLState scissor(mGL, LOCAL_GL_SCISSOR_TEST, false);
     mGL->BindReadFB(srcFB);
     mGL->BindDrawFB(destFB);
     mGL->fBlitFramebuffer(0, 0,  srcSize.width,  srcSize.height,
 , 0, destSize.width, destSize.height,
                           LOCAL_GL_COLOR_BUFFER_BIT,
                           LOCAL_GL_NEAREST);
 }
 void
 GLBlitHelper::BlitFramebufferToFramebuffer(GLuint srcFB, GLuint destFB,
                                         const gfx::IntSize& srcSize,
                                         const gfx::IntSize& destSize,
                                         const GLFormats& srcFormats)
 {
     MOZ_ASSERT(!srcFB || mGL->fIsFramebuffer(srcFB));
     MOZ_ASSERT(!destFB || mGL->fIsFramebuffer(destFB));
     if (mGL->IsSupported(GLFeature::framebuffer_blit)) {
         BlitFramebufferToFramebuffer(srcFB, destFB,
                                      srcSize, destSize);
         return;
     }
     GLuint tex = CreateTextureForOffscreen(mGL, srcFormats, srcSize);
     MOZ_ASSERT(tex);
     BlitFramebufferToTexture(srcFB, tex, srcSize, srcSize);
     BlitTextureToFramebuffer(tex, destFB, srcSize, destSize);
     mGL->fDeleteTextures(1, &tex);
 }
 void
 GLBlitHelper::BlitTextureToFramebuffer(GLuint srcTex, GLuint destFB,
                                     const gfx::IntSize& srcSize,
                                     const gfx::IntSize& destSize,
                                     GLenum srcTarget)
 {
     MOZ_ASSERT(mGL->fIsTexture(srcTex));
     MOZ_ASSERT(!destFB || mGL->fIsFramebuffer(destFB));
     if (mGL->IsSupported(GLFeature::framebuffer_blit)) {
         ScopedFramebufferForTexture srcWrapper(mGL, srcTex, srcTarget);
         MOZ_ASSERT(srcWrapper.IsComplete());
         BlitFramebufferToFramebuffer(srcWrapper.FB(), destFB,
                                      srcSize, destSize);
         return;
     }
     ScopedBindFramebuffer boundFB(mGL, destFB);
     // UseTexQuadProgram initializes a shader that reads
     // from texture unit 0.
     ScopedBindTextureUnit boundTU(mGL, LOCAL_GL_TEXTURE0);
     ScopedBindTexture boundTex(mGL, srcTex, srcTarget);
     GLuint boundProgram = 0;
     mGL->GetUIntegerv(LOCAL_GL_CURRENT_PROGRAM, &boundProgram);
     GLuint boundBuffer = 0;
     mGL->GetUIntegerv(LOCAL_GL_ARRAY_BUFFER_BINDING, &boundBuffer);
     /*
      * mGL->fGetVertexAttribiv takes:
      *  VERTEX_ATTRIB_ARRAY_ENABLED
      *  VERTEX_ATTRIB_ARRAY_SIZE,
      *  VERTEX_ATTRIB_ARRAY_STRIDE,
      *  VERTEX_ATTRIB_ARRAY_TYPE,
      *  VERTEX_ATTRIB_ARRAY_NORMALIZED,
      *  VERTEX_ATTRIB_ARRAY_BUFFER_BINDING,
      *  CURRENT_VERTEX_ATTRIB
      *
      * CURRENT_VERTEX_ATTRIB is vertex shader state. \o/
      * Others appear to be vertex array state,
      * or alternatively in the internal vertex array state
      * for a buffer object.
     */
     GLint attrib0_enabled = 0;
     GLint attrib0_size = 0;
     GLint attrib0_stride = 0;
     GLint attrib0_type = 0;
     GLint attrib0_normalized = 0;
     GLint attrib0_bufferBinding = 0;
     void* attrib0_pointer = nullptr;
     mGL->fGetVertexAttribiv(0, LOCAL_GL_VERTEX_ATTRIB_ARRAY_ENABLED, &attrib0_enabled);
     mGL->fGetVertexAttribiv(0, LOCAL_GL_VERTEX_ATTRIB_ARRAY_SIZE, &attrib0_size);
     mGL->fGetVertexAttribiv(0, LOCAL_GL_VERTEX_ATTRIB_ARRAY_STRIDE, &attrib0_stride);
     mGL->fGetVertexAttribiv(0, LOCAL_GL_VERTEX_ATTRIB_ARRAY_TYPE, &attrib0_type);
     mGL->fGetVertexAttribiv(0, LOCAL_GL_VERTEX_ATTRIB_ARRAY_NORMALIZED, &attrib0_normalized);
     mGL->fGetVertexAttribiv(0, LOCAL_GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING, &attrib0_bufferBinding);
     mGL->fGetVertexAttribPointerv(0, LOCAL_GL_VERTEX_ATTRIB_ARRAY_POINTER, &attrib0_pointer);
     // Note that uniform values are program state, so we don't need to rebind those.
     ScopedGLState blend       (mGL, LOCAL_GL_BLEND,      false);
     ScopedGLState cullFace    (mGL, LOCAL_GL_CULL_FACE,  false);
     ScopedGLState depthTest   (mGL, LOCAL_GL_DEPTH_TEST, false);
     ScopedGLState dither      (mGL, LOCAL_GL_DITHER,     false);
     ScopedGLState polyOffsFill(mGL, LOCAL_GL_POLYGON_OFFSET_FILL,      false);
     ScopedGLState sampleAToC  (mGL, LOCAL_GL_SAMPLE_ALPHA_TO_COVERAGE, false);
     ScopedGLState sampleCover (mGL, LOCAL_GL_SAMPLE_COVERAGE, false);
     ScopedGLState scissor     (mGL, LOCAL_GL_SCISSOR_TEST,    false);
     ScopedGLState stencil     (mGL, LOCAL_GL_STENCIL_TEST,    false);
     realGLboolean colorMask[4];
     mGL->fGetBooleanv(LOCAL_GL_COLOR_WRITEMASK, colorMask);
     mGL->fColorMask(LOCAL_GL_TRUE,
                     LOCAL_GL_TRUE,
                     LOCAL_GL_TRUE,
                     LOCAL_GL_TRUE);
     GLint viewport[4];
     mGL->fGetIntegerv(LOCAL_GL_VIEWPORT, viewport);
     mGL->fViewport(0, 0, destSize.width, destSize.height);
     // Does destructive things to (only!) what we just saved above.
     bool good = UseTexQuadProgram(srcTarget, srcSize);
     if (!good) {
         // We're up against the wall, so bail.
         // This should really be MOZ_CRASH(why) or MOZ_RUNTIME_ASSERT(good).
         printf_stderr("[%s:%d] Fatal Error: Failed to prepare to blit texture->framebuffer.\n",
                       __FILE__, __LINE__);
         MOZ_CRASH();
     }
     mGL->fDrawArrays(LOCAL_GL_TRIANGLE_STRIP, 0, 4);
     mGL->fViewport(viewport[0], viewport[1],
                    viewport[2], viewport[3]);
     mGL->fColorMask(colorMask[0],
                     colorMask[1],
                     colorMask[2],
                     colorMask[3]);
     if (attrib0_enabled)
         mGL->fEnableVertexAttribArray(0);
     mGL->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, attrib0_bufferBinding);
     mGL->fVertexAttribPointer(0,
                               attrib0_size,
                               attrib0_type,
                               attrib0_normalized,
                               attrib0_stride,
                               attrib0_pointer);
     mGL->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, boundBuffer);
     mGL->fUseProgram(boundProgram);
 }
 void
 GLBlitHelper::BlitFramebufferToTexture(GLuint srcFB, GLuint destTex,
                                     const gfx::IntSize& srcSize,
                                     const gfx::IntSize& destSize,
                                     GLenum destTarget)
 {
     MOZ_ASSERT(!srcFB || mGL->fIsFramebuffer(srcFB));
     MOZ_ASSERT(mGL->fIsTexture(destTex));
     if (mGL->IsSupported(GLFeature::framebuffer_blit)) {
         ScopedFramebufferForTexture destWrapper(mGL, destTex, destTarget);
         BlitFramebufferToFramebuffer(srcFB, destWrapper.FB(),
                                      srcSize, destSize);
         return;
     }
     ScopedBindTexture autoTex(mGL, destTex, destTarget);
     ScopedBindFramebuffer boundFB(mGL, srcFB);
     ScopedGLState scissor(mGL, LOCAL_GL_SCISSOR_TEST, false);
     mGL->fCopyTexSubImage2D(destTarget, 0,
 , 0,
 , 0,
                        srcSize.width, srcSize.height);
 }
 void
 GLBlitHelper::BlitTextureToTexture(GLuint srcTex, GLuint destTex,
                                 const gfx::IntSize& srcSize,
                                 const gfx::IntSize& destSize,
                                 GLenum srcTarget, GLenum destTarget)
 {
     MOZ_ASSERT(mGL->fIsTexture(srcTex));
     MOZ_ASSERT(mGL->fIsTexture(destTex));
     // Generally, just use the CopyTexSubImage path
     ScopedFramebufferForTexture srcWrapper(mGL, srcTex, srcTarget);
     BlitFramebufferToTexture(srcWrapper.FB(), destTex,
                              srcSize, destSize, destTarget);
 }
 }
 }

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gfx/gl/GLBlitHelper.cpp@97036ab72558 (annotated)

gfx/gl/GLBlitHelper.cpp