The Tor Browser: gfx/layers/opengl/CompositorOGL.cpp@129ffea94266 (annotated)

gfx/layers/opengl/CompositorOGL.cpp@129ffea94266 (annotated)

gfx/layers/opengl/CompositorOGL.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
  * 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 "CompositorOGL.h"
 #include <stddef.h>                     // for size_t
 #include <stdint.h>                     // for uint32_t, uint8_t
 #include <stdlib.h>                     // for free, malloc
 #include "GLContextProvider.h"          // for GLContextProvider
 #include "GLContext.h"                  // for GLContext
 #include "GLUploadHelpers.h"
 #include "Layers.h"                     // for WriteSnapshotToDumpFile
 #include "LayerScope.h"                 // for LayerScope
 #include "gfx2DGlue.h"                  // for ThebesFilter
 #include "gfx3DMatrix.h"                // for gfx3DMatrix
 #include "gfxCrashReporterUtils.h"      // for ScopedGfxFeatureReporter
 #include "gfxImageSurface.h"            // for gfxImageSurface
 #include "gfxMatrix.h"                  // for gfxMatrix
 #include "GraphicsFilter.h"             // for GraphicsFilter
 #include "gfxPlatform.h"                // for gfxPlatform
 #include "gfxPrefs.h"                   // for gfxPrefs
 #include "gfxRect.h"                    // for gfxRect
 #include "gfxUtils.h"                   // for NextPowerOfTwo, gfxUtils, etc
 #include "mozilla/ArrayUtils.h"         // for ArrayLength
 #include "mozilla/Preferences.h"        // for Preferences
 #include "mozilla/gfx/BasePoint.h"      // for BasePoint
 #include "mozilla/gfx/Matrix.h"         // for Matrix4x4, Matrix
 #include "mozilla/layers/LayerManagerComposite.h"  // for LayerComposite, etc
 #include "mozilla/layers/CompositingRenderTargetOGL.h"
 #include "mozilla/layers/Effects.h"     // for EffectChain, TexturedEffect, etc
 #include "mozilla/layers/TextureHost.h"  // for TextureSource, etc
 #include "mozilla/layers/TextureHostOGL.h"  // for TextureSourceOGL, etc
 #include "mozilla/mozalloc.h"           // for operator delete, etc
 #include "nsAString.h"
 #include "nsIConsoleService.h"          // for nsIConsoleService, etc
 #include "nsIWidget.h"                  // for nsIWidget
 #include "nsLiteralString.h"            // for NS_LITERAL_STRING
 #include "nsMathUtils.h"                // for NS_roundf
 #include "nsRect.h"                     // for nsIntRect
 #include "nsServiceManagerUtils.h"      // for do_GetService
 #include "nsString.h"                   // for nsString, nsAutoCString, etc
 #include "DecomposeIntoNoRepeatTriangles.h"
 #include "ScopedGLHelpers.h"
 #include "GLReadTexImageHelper.h"
 #include "TiledLayerBuffer.h"           // for TiledLayerComposer
 #if MOZ_ANDROID_OMTC
 #include "TexturePoolOGL.h"
 #endif
 #ifdef XP_MACOSX
 #include "nsCocoaFeatures.h"
 #endif
 #include "GeckoProfiler.h"
 #if defined(MOZ_WIDGET_GONK) && ANDROID_VERSION >= 17
 #include "libdisplay/GonkDisplay.h"     // for GonkDisplay
 #include <ui/Fence.h>
 #endif
 #define BUFFER_OFFSET(i) ((char *)nullptr + (i))
 namespace mozilla {
 using namespace std;
 using namespace gfx;
 namespace layers {
 using namespace mozilla::gl;
 static inline IntSize ns2gfxSize(const nsIntSize& s) {
   return IntSize(s.width, s.height);
 }
 static void
 BindMaskForProgram(ShaderProgramOGL* aProgram, TextureSourceOGL* aSourceMask,
                    GLenum aTexUnit, const gfx::Matrix4x4& aTransform)
 {
   MOZ_ASSERT(LOCAL_GL_TEXTURE0 <= aTexUnit && aTexUnit <= LOCAL_GL_TEXTURE31);
   aSourceMask->BindTexture(aTexUnit, gfx::Filter::LINEAR);
   aProgram->SetMaskTextureUnit(aTexUnit - LOCAL_GL_TEXTURE0);
   aProgram->SetMaskLayerTransform(aTransform);
 }
 // Draw the given quads with the already selected shader. Texture coordinates
 // are supplied if the shader requires them.
 static void
 DrawQuads(GLContext *aGLContext,
           VBOArena &aVBOs,
           ShaderProgramOGL *aProg,
           GLenum aMode,
           RectTriangles &aRects)
 {
   NS_ASSERTION(aProg->HasInitialized(), "Shader program not correctly initialized");
   GLuint vertAttribIndex =
     aProg->AttribLocation(ShaderProgramOGL::VertexCoordAttrib);
   GLuint texCoordAttribIndex =
     aProg->AttribLocation(ShaderProgramOGL::TexCoordAttrib);
   bool texCoords = (texCoordAttribIndex != GLuint(-1));
   GLsizei bytes = aRects.elements() * 2 * sizeof(GLfloat);
   GLsizei total = bytes;
   if (texCoords) {
     total *= 2;
   }
   aGLContext->fBindBuffer(LOCAL_GL_ARRAY_BUFFER,
                           aVBOs.Allocate(aGLContext));
   aGLContext->fBufferData(LOCAL_GL_ARRAY_BUFFER,
                           total,
                           nullptr,
                           LOCAL_GL_STREAM_DRAW);
   aGLContext->fBufferSubData(LOCAL_GL_ARRAY_BUFFER,
 ,
                              bytes,
                              aRects.vertCoords().Elements());
   aGLContext->fEnableVertexAttribArray(vertAttribIndex);
   aGLContext->fVertexAttribPointer(vertAttribIndex,
 , LOCAL_GL_FLOAT,
                                    LOCAL_GL_FALSE,
 , BUFFER_OFFSET(0));
   if (texCoords) {
     aGLContext->fBufferSubData(LOCAL_GL_ARRAY_BUFFER,
                                bytes,
                                bytes,
                                aRects.texCoords().Elements());
     aGLContext->fEnableVertexAttribArray(texCoordAttribIndex);
     aGLContext->fVertexAttribPointer(texCoordAttribIndex,
 , LOCAL_GL_FLOAT,
                                      LOCAL_GL_FALSE,
 , BUFFER_OFFSET(bytes));
   } else {
     aGLContext->fDisableVertexAttribArray(texCoordAttribIndex);
   }
   aGLContext->fDrawArrays(aMode, 0, aRects.elements());
   aGLContext->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, 0);
 }
 CompositorOGL::CompositorOGL(nsIWidget *aWidget, int aSurfaceWidth,
                              int aSurfaceHeight, bool aUseExternalSurfaceSize)
   : mWidget(aWidget)
   , mWidgetSize(-1, -1)
   , mSurfaceSize(aSurfaceWidth, aSurfaceHeight)
   , mHasBGRA(0)
   , mUseExternalSurfaceSize(aUseExternalSurfaceSize)
   , mFrameInProgress(false)
   , mDestroyed(false)
   , mHeight(0)
 {
   MOZ_COUNT_CTOR(CompositorOGL);
   SetBackend(LayersBackend::LAYERS_OPENGL);
 }
 CompositorOGL::~CompositorOGL()
 {
   MOZ_COUNT_DTOR(CompositorOGL);
   Destroy();
 }
 already_AddRefed<mozilla::gl::GLContext>
 CompositorOGL::CreateContext()
 {
   nsRefPtr<GLContext> context;
 #ifdef XP_WIN
   if (PR_GetEnv("MOZ_LAYERS_PREFER_EGL")) {
     printf_stderr("Trying GL layers...\n");
     context = gl::GLContextProviderEGL::CreateForWindow(mWidget);
   }
 #endif
   if (!context)
     context = gl::GLContextProvider::CreateForWindow(mWidget);
   if (!context) {
     NS_WARNING("Failed to create CompositorOGL context");
   }
   return context.forget();
 }
 void
 CompositorOGL::Destroy()
 {
   if (gl() && gl()->MakeCurrent()) {
     mVBOs.Flush(gl());
   }
   if (mTexturePool) {
     mTexturePool->Clear();
     mTexturePool = nullptr;
   }
   if (!mDestroyed) {
     mDestroyed = true;
     CleanupResources();
   }
 }
 void
 CompositorOGL::CleanupResources()
 {
   if (!mGLContext)
     return;
   nsRefPtr<GLContext> ctx = mGLContext->GetSharedContext();
   if (!ctx) {
     ctx = mGLContext;
   }
   for (std::map<ShaderConfigOGL, ShaderProgramOGL *>::iterator iter = mPrograms.begin();
        iter != mPrograms.end();
        iter++) {
     delete iter->second;
   }
   mPrograms.clear();
   if (!ctx->MakeCurrent()) {
     mQuadVBO = 0;
     mGLContext = nullptr;
     return;
   }
   ctx->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, 0);
   if (mQuadVBO) {
     ctx->fDeleteBuffers(1, &mQuadVBO);
     mQuadVBO = 0;
   }
   mGLContext = nullptr;
 }
 bool
 CompositorOGL::Initialize()
 {
   ScopedGfxFeatureReporter reporter("GL Layers", true);
   // Do not allow double initialization
   NS_ABORT_IF_FALSE(mGLContext == nullptr, "Don't reinitialize CompositorOGL");
   mGLContext = CreateContext();
 #ifdef MOZ_WIDGET_ANDROID
   if (!mGLContext)
     NS_RUNTIMEABORT("We need a context on Android");
 #endif
   if (!mGLContext)
     return false;
   MakeCurrent();
   mHasBGRA =
     mGLContext->IsExtensionSupported(gl::GLContext::EXT_texture_format_BGRA8888) ||
     mGLContext->IsExtensionSupported(gl::GLContext::EXT_bgra);
   mGLContext->fBlendFuncSeparate(LOCAL_GL_ONE, LOCAL_GL_ONE_MINUS_SRC_ALPHA,
                                  LOCAL_GL_ONE, LOCAL_GL_ONE);
   mGLContext->fEnable(LOCAL_GL_BLEND);
   // initialise a common shader to check that we can actually compile a shader
   RefPtr<EffectSolidColor> effect = new EffectSolidColor(Color(0, 0, 0, 0));
   ShaderConfigOGL config = GetShaderConfigFor(effect);
   if (!GetShaderProgramFor(config)) {
     return false;
   }
   if (mGLContext->WorkAroundDriverBugs()) {
     /**
     * We'll test the ability here to bind NPOT textures to a framebuffer, if
     * this fails we'll try ARB_texture_rectangle.
     */
     GLenum textureTargets[] = {
       LOCAL_GL_TEXTURE_2D,
       LOCAL_GL_NONE
     };
     if (!mGLContext->IsGLES()) {
       // No TEXTURE_RECTANGLE_ARB available on ES2
       textureTargets[1] = LOCAL_GL_TEXTURE_RECTANGLE_ARB;
     }
     mFBOTextureTarget = LOCAL_GL_NONE;
     GLuint testFBO = 0;
     mGLContext->fGenFramebuffers(1, &testFBO);
     GLuint testTexture = 0;
     for (uint32_t i = 0; i < ArrayLength(textureTargets); i++) {
       GLenum target = textureTargets[i];
       if (!target)
           continue;
       mGLContext->fGenTextures(1, &testTexture);
       mGLContext->fBindTexture(target, testTexture);
       mGLContext->fTexParameteri(target,
                                 LOCAL_GL_TEXTURE_MIN_FILTER,
                                 LOCAL_GL_NEAREST);
       mGLContext->fTexParameteri(target,
                                 LOCAL_GL_TEXTURE_MAG_FILTER,
                                 LOCAL_GL_NEAREST);
       mGLContext->fTexImage2D(target,
 ,
                               LOCAL_GL_RGBA,
 , 3, /* sufficiently NPOT */
 ,
                               LOCAL_GL_RGBA,
                               LOCAL_GL_UNSIGNED_BYTE,
                               nullptr);
       // unbind this texture, in preparation for binding it to the FBO
       mGLContext->fBindTexture(target, 0);
       mGLContext->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, testFBO);
       mGLContext->fFramebufferTexture2D(LOCAL_GL_FRAMEBUFFER,
                                         LOCAL_GL_COLOR_ATTACHMENT0,
                                         target,
                                         testTexture,
 );
       if (mGLContext->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER) ==
           LOCAL_GL_FRAMEBUFFER_COMPLETE)
       {
         mFBOTextureTarget = target;
         mGLContext->fDeleteTextures(1, &testTexture);
         break;
       }
       mGLContext->fDeleteTextures(1, &testTexture);
     }
     if (testFBO) {
       mGLContext->fDeleteFramebuffers(1, &testFBO);
     }
     if (mFBOTextureTarget == LOCAL_GL_NONE) {
       /* Unable to find a texture target that works with FBOs and NPOT textures */
       return false;
     }
   } else {
     // not trying to work around driver bugs, so TEXTURE_2D should just work
     mFBOTextureTarget = LOCAL_GL_TEXTURE_2D;
   }
   // back to default framebuffer, to avoid confusion
   mGLContext->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, 0);
   if (mFBOTextureTarget == LOCAL_GL_TEXTURE_RECTANGLE_ARB) {
     /* If we're using TEXTURE_RECTANGLE, then we must have the ARB
      * extension -- the EXT variant does not provide support for
      * texture rectangle access inside GLSL (sampler2DRect,
      * texture2DRect).
      */
     if (!mGLContext->IsExtensionSupported(gl::GLContext::ARB_texture_rectangle))
       return false;
   }
   /* Create a simple quad VBO */
   mGLContext->fGenBuffers(1, &mQuadVBO);
   mGLContext->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, mQuadVBO);
   GLfloat vertices[] = {
     /* First quad vertices */
 .0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
     /* Then quad texcoords */
 .0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
   };
   mGLContext->fBufferData(LOCAL_GL_ARRAY_BUFFER, sizeof(vertices), vertices, LOCAL_GL_STATIC_DRAW);
   mGLContext->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, 0);
   nsCOMPtr<nsIConsoleService>
     console(do_GetService(NS_CONSOLESERVICE_CONTRACTID));
   if (console) {
     nsString msg;
     msg +=
       NS_LITERAL_STRING("OpenGL compositor Initialized Succesfully.\nVersion: ");
     msg += NS_ConvertUTF8toUTF16(
       nsDependentCString((const char*)mGLContext->fGetString(LOCAL_GL_VERSION)));
     msg += NS_LITERAL_STRING("\nVendor: ");
     msg += NS_ConvertUTF8toUTF16(
       nsDependentCString((const char*)mGLContext->fGetString(LOCAL_GL_VENDOR)));
     msg += NS_LITERAL_STRING("\nRenderer: ");
     msg += NS_ConvertUTF8toUTF16(
       nsDependentCString((const char*)mGLContext->fGetString(LOCAL_GL_RENDERER)));
     msg += NS_LITERAL_STRING("\nFBO Texture Target: ");
     if (mFBOTextureTarget == LOCAL_GL_TEXTURE_2D)
       msg += NS_LITERAL_STRING("TEXTURE_2D");
     else
       msg += NS_LITERAL_STRING("TEXTURE_RECTANGLE");
     console->LogStringMessage(msg.get());
   }
   reporter.SetSuccessful();
   return true;
 }
 // |aTextureTransform| is the texture transform that will be set on
 // aProg, possibly multiplied with another texture transform of our
 // own.
 // |aTexCoordRect| is the rectangle from the texture that we want to
 // draw using the given program.  The program already has a necessary
 // offset and scale, so the geometry that needs to be drawn is a unit
 // square from 0,0 to 1,1.
 //
 // |aTexture| is the texture we are drawing. Its actual size can be
 // larger than the rectangle given by |aTexCoordRect|.
 void
 CompositorOGL::BindAndDrawQuadWithTextureRect(ShaderProgramOGL *aProg,
                                               const gfx3DMatrix& aTextureTransform,
                                               const Rect& aTexCoordRect,
                                               TextureSource *aTexture)
 {
   // Given what we know about these textures and coordinates, we can
   // compute fmod(t, 1.0f) to get the same texture coordinate out.  If
   // the texCoordRect dimension is < 0 or > width/height, then we have
   // wraparound that we need to deal with by drawing multiple quads,
   // because we can't rely on full non-power-of-two texture support
   // (which is required for the REPEAT wrap mode).
   RectTriangles rects;
   GLenum wrapMode = aTexture->AsSourceOGL()->GetWrapMode();
   IntSize realTexSize = aTexture->GetSize();
   if (!CanUploadNonPowerOfTwo(mGLContext)) {
     realTexSize = IntSize(NextPowerOfTwo(realTexSize.width),
                           NextPowerOfTwo(realTexSize.height));
   }
   // We need to convert back to actual texels here to get proper behaviour with
   // our GL helper functions. Should fix this sometime.
   // I want to vomit.
   IntRect texCoordRect = IntRect(NS_roundf(aTexCoordRect.x * aTexture->GetSize().width),
                                  NS_roundf(aTexCoordRect.y * aTexture->GetSize().height),
                                  NS_roundf(aTexCoordRect.width * aTexture->GetSize().width),
                                  NS_roundf(aTexCoordRect.height * aTexture->GetSize().height));
   // This is fairly disgusting - if the texture should be flipped it will have a
   // negative height, in which case we un-invert the texture coords and pass the
   // flipped 'flag' to the functions below. We can't just use the inverted coords
   // because our GL funtions use an explicit flag.
   bool flipped = false;
   if (texCoordRect.height < 0) {
     flipped = true;
     texCoordRect.y = texCoordRect.YMost();
     texCoordRect.height = -texCoordRect.height;
   }
   if (wrapMode == LOCAL_GL_REPEAT) {
     rects.addRect(/* dest rectangle */
 .0f, 0.0f, 1.0f, 1.0f,
                   /* tex coords */
                   texCoordRect.x / GLfloat(realTexSize.width),
                   texCoordRect.y / GLfloat(realTexSize.height),
                   texCoordRect.XMost() / GLfloat(realTexSize.width),
                   texCoordRect.YMost() / GLfloat(realTexSize.height),
                   flipped);
   } else {
     nsIntRect tcRect(texCoordRect.x, texCoordRect.y,
                      texCoordRect.width, texCoordRect.height);
     DecomposeIntoNoRepeatTriangles(tcRect,
                                    nsIntSize(realTexSize.width, realTexSize.height),
                                    rects, flipped);
   }
   gfx3DMatrix textureTransform;
   if (rects.isSimpleQuad(textureTransform)) {
     Matrix4x4 transform;
     ToMatrix4x4(aTextureTransform * textureTransform, transform);
     aProg->SetTextureTransform(transform);
     BindAndDrawQuad(aProg);
   } else {
     Matrix4x4 transform;
     ToMatrix4x4(aTextureTransform, transform);
     aProg->SetTextureTransform(transform);
     DrawQuads(mGLContext, mVBOs, aProg, LOCAL_GL_TRIANGLES, rects);
   }
 }
 void
 CompositorOGL::PrepareViewport(const gfx::IntSize& aSize,
                                const Matrix& aWorldTransform)
 {
   // Set the viewport correctly.
   mGLContext->fViewport(0, 0, aSize.width, aSize.height);
   mHeight = aSize.height;
   // We flip the view matrix around so that everything is right-side up; we're
   // drawing directly into the window's back buffer, so this keeps things
   // looking correct.
   // XXX: We keep track of whether the window size changed, so we could skip
   // this update if it hadn't changed since the last call. We will need to
   // track changes to aTransformPolicy and aWorldTransform for this to work
   // though.
   // Matrix to transform (0, 0, aWidth, aHeight) to viewport space (-1.0, 1.0,
   // 2, 2) and flip the contents.
   Matrix viewMatrix;
   viewMatrix.Translate(-1.0, 1.0);
   viewMatrix.Scale(2.0f / float(aSize.width), 2.0f / float(aSize.height));
   viewMatrix.Scale(1.0f, -1.0f);
   if (!mTarget) {
     viewMatrix.Translate(mRenderOffset.x, mRenderOffset.y);
   }
   viewMatrix = aWorldTransform * viewMatrix;
   Matrix4x4 matrix3d = Matrix4x4::From2D(viewMatrix);
   matrix3d._33 = 0.0f;
   mProjMatrix = matrix3d;
 }
 TemporaryRef<CompositingRenderTarget>
 CompositorOGL::CreateRenderTarget(const IntRect &aRect, SurfaceInitMode aInit)
 {
   GLuint tex = 0;
   GLuint fbo = 0;
   CreateFBOWithTexture(aRect, false, 0, &fbo, &tex);
   RefPtr<CompositingRenderTargetOGL> surface
     = new CompositingRenderTargetOGL(this, aRect.TopLeft(), tex, fbo);
   surface->Initialize(aRect.Size(), mFBOTextureTarget, aInit);
   return surface.forget();
 }
 TemporaryRef<CompositingRenderTarget>
 CompositorOGL::CreateRenderTargetFromSource(const IntRect &aRect,
                                             const CompositingRenderTarget *aSource,
                                             const IntPoint &aSourcePoint)
 {
   GLuint tex = 0;
   GLuint fbo = 0;
   const CompositingRenderTargetOGL* sourceSurface
     = static_cast<const CompositingRenderTargetOGL*>(aSource);
   IntRect sourceRect(aSourcePoint, aRect.Size());
   if (aSource) {
     CreateFBOWithTexture(sourceRect, true, sourceSurface->GetFBO(),
                          &fbo, &tex);
   } else {
     CreateFBOWithTexture(sourceRect, true, 0,
                          &fbo, &tex);
   }
   RefPtr<CompositingRenderTargetOGL> surface
     = new CompositingRenderTargetOGL(this, aRect.TopLeft(), tex, fbo);
   surface->Initialize(aRect.Size(),
                       mFBOTextureTarget,
                       INIT_MODE_NONE);
   return surface.forget();
 }
 void
 CompositorOGL::SetRenderTarget(CompositingRenderTarget *aSurface)
 {
   MOZ_ASSERT(aSurface);
   CompositingRenderTargetOGL* surface
     = static_cast<CompositingRenderTargetOGL*>(aSurface);
   if (mCurrentRenderTarget != surface) {
     surface->BindRenderTarget();
     mCurrentRenderTarget = surface;
   }
 }
 CompositingRenderTarget*
 CompositorOGL::GetCurrentRenderTarget() const
 {
   return mCurrentRenderTarget;
 }
 static GLenum
 GetFrameBufferInternalFormat(GLContext* gl,
                              GLuint aFrameBuffer,
                              nsIWidget* aWidget)
 {
   if (aFrameBuffer == 0) { // default framebuffer
     return aWidget->GetGLFrameBufferFormat();
   }
   return LOCAL_GL_RGBA;
 }
 /*
  * Returns a size that is larger than and closest to aSize where both
  * width and height are powers of two.
  * If the OpenGL setup is capable of using non-POT textures, then it
  * will just return aSize.
  */
 static IntSize
 CalculatePOTSize(const IntSize& aSize, GLContext* gl)
 {
   if (CanUploadNonPowerOfTwo(gl))
     return aSize;
   return IntSize(NextPowerOfTwo(aSize.width), NextPowerOfTwo(aSize.height));
 }
 void
 CompositorOGL::ClearRect(const gfx::Rect& aRect)
 {
   // Map aRect to OGL coordinates, origin:bottom-left
   GLint y = mHeight - (aRect.y + aRect.height);
   ScopedGLState scopedScissorTestState(mGLContext, LOCAL_GL_SCISSOR_TEST, true);
   ScopedScissorRect autoScissorRect(mGLContext, aRect.x, y, aRect.width, aRect.height);
   mGLContext->fClearColor(0.0, 0.0, 0.0, 0.0);
   mGLContext->fClear(LOCAL_GL_COLOR_BUFFER_BIT | LOCAL_GL_DEPTH_BUFFER_BIT);
 }
 void
 CompositorOGL::BeginFrame(const nsIntRegion& aInvalidRegion,
                           const Rect *aClipRectIn,
                           const gfx::Matrix& aTransform,
                           const Rect& aRenderBounds,
                           Rect *aClipRectOut,
                           Rect *aRenderBoundsOut)
 {
   PROFILER_LABEL("CompositorOGL", "BeginFrame");
   MOZ_ASSERT(!mFrameInProgress, "frame still in progress (should have called EndFrame or AbortFrame");
   LayerScope::BeginFrame(mGLContext, PR_Now());
   mVBOs.Reset();
   mFrameInProgress = true;
   gfx::Rect rect;
   if (mUseExternalSurfaceSize) {
     rect = gfx::Rect(0, 0, mSurfaceSize.width, mSurfaceSize.height);
   } else {
     rect = gfx::Rect(aRenderBounds.x, aRenderBounds.y, aRenderBounds.width, aRenderBounds.height);
     // If render bounds is not updated explicitly, try to infer it from widget
     if (rect.width == 0 || rect.height == 0) {
       // FIXME/bug XXXXXX this races with rotation changes on the main
       // thread, and undoes all the care we take with layers txns being
       // sent atomically with rotation changes
       nsIntRect intRect;
       mWidget->GetClientBounds(intRect);
       rect = gfx::Rect(0, 0, intRect.width, intRect.height);
     }
   }
   rect = aTransform.TransformBounds(rect);
   if (aRenderBoundsOut) {
     *aRenderBoundsOut = rect;
   }
   GLint width = rect.width;
   GLint height = rect.height;
   // We can't draw anything to something with no area
   // so just return
   if (width == 0 || height == 0)
     return;
   // If the widget size changed, we have to force a MakeCurrent
   // to make sure that GL sees the updated widget size.
   if (mWidgetSize.width != width ||
       mWidgetSize.height != height)
   {
     MakeCurrent(ForceMakeCurrent);
     mWidgetSize.width = width;
     mWidgetSize.height = height;
   } else {
     MakeCurrent();
   }
   mPixelsPerFrame = width * height;
   mPixelsFilled = 0;
 #if MOZ_ANDROID_OMTC
   TexturePoolOGL::Fill(gl());
 #endif
   mCurrentRenderTarget = CompositingRenderTargetOGL::RenderTargetForWindow(this,
                             IntSize(width, height),
                             aTransform);
   mCurrentRenderTarget->BindRenderTarget();
 #ifdef DEBUG
   mWindowRenderTarget = mCurrentRenderTarget;
 #endif
   // Default blend function implements "OVER"
   mGLContext->fBlendFuncSeparate(LOCAL_GL_ONE, LOCAL_GL_ONE_MINUS_SRC_ALPHA,
                                  LOCAL_GL_ONE, LOCAL_GL_ONE);
   mGLContext->fEnable(LOCAL_GL_BLEND);
   mGLContext->fEnable(LOCAL_GL_SCISSOR_TEST);
   if (aClipRectOut && !aClipRectIn) {
     aClipRectOut->SetRect(0, 0, width, height);
   }
   // If the Android compositor is being used, this clear will be done in
   // DrawWindowUnderlay. Make sure the bits used here match up with those used
   // in mobile/android/base/gfx/LayerRenderer.java
 #ifndef MOZ_ANDROID_OMTC
   mGLContext->fClearColor(0.0, 0.0, 0.0, 0.0);
   mGLContext->fClear(LOCAL_GL_COLOR_BUFFER_BIT | LOCAL_GL_DEPTH_BUFFER_BIT);
 #endif
 }
 void
 CompositorOGL::CreateFBOWithTexture(const IntRect& aRect, bool aCopyFromSource,
                                     GLuint aSourceFrameBuffer,
                                     GLuint *aFBO, GLuint *aTexture)
 {
   GLuint tex, fbo;
   mGLContext->fActiveTexture(LOCAL_GL_TEXTURE0);
   mGLContext->fGenTextures(1, &tex);
   mGLContext->fBindTexture(mFBOTextureTarget, tex);
   if (aCopyFromSource) {
     GLuint curFBO = mCurrentRenderTarget->GetFBO();
     if (curFBO != aSourceFrameBuffer) {
       mGLContext->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, aSourceFrameBuffer);
     }
     // We're going to create an RGBA temporary fbo.  But to
     // CopyTexImage() from the current framebuffer, the framebuffer's
     // format has to be compatible with the new texture's.  So we
     // check the format of the framebuffer here and take a slow path
     // if it's incompatible.
     GLenum format =
       GetFrameBufferInternalFormat(gl(), aSourceFrameBuffer, mWidget);
     bool isFormatCompatibleWithRGBA
         = gl()->IsGLES() ? (format == LOCAL_GL_RGBA)
                           : true;
     if (isFormatCompatibleWithRGBA) {
       mGLContext->fCopyTexImage2D(mFBOTextureTarget,
 ,
                                   LOCAL_GL_RGBA,
                                   aRect.x, FlipY(aRect.y + aRect.height),
                                   aRect.width, aRect.height,
 );
     } else {
       // Curses, incompatible formats.  Take a slow path.
       // RGBA
       size_t bufferSize = aRect.width * aRect.height * 4;
       nsAutoArrayPtr<uint8_t> buf(new uint8_t[bufferSize]);
       mGLContext->fReadPixels(aRect.x, aRect.y,
                               aRect.width, aRect.height,
                               LOCAL_GL_RGBA,
                               LOCAL_GL_UNSIGNED_BYTE,
                               buf);
       mGLContext->fTexImage2D(mFBOTextureTarget,
 ,
                               LOCAL_GL_RGBA,
                               aRect.width, aRect.height,
 ,
                               LOCAL_GL_RGBA,
                               LOCAL_GL_UNSIGNED_BYTE,
                               buf);
     }
     GLenum error = mGLContext->GetAndClearError();
     if (error != LOCAL_GL_NO_ERROR) {
       nsAutoCString msg;
       msg.AppendPrintf("Texture initialization failed! -- error 0x%x, Source %d, Source format %d,  RGBA Compat %d",
                        error, aSourceFrameBuffer, format, isFormatCompatibleWithRGBA);
       NS_ERROR(msg.get());
     }
   } else {
     mGLContext->fTexImage2D(mFBOTextureTarget,
 ,
                             LOCAL_GL_RGBA,
                             aRect.width, aRect.height,
 ,
                             LOCAL_GL_RGBA,
                             LOCAL_GL_UNSIGNED_BYTE,
                             nullptr);
   }
   mGLContext->fTexParameteri(mFBOTextureTarget, LOCAL_GL_TEXTURE_MIN_FILTER,
                              LOCAL_GL_LINEAR);
   mGLContext->fTexParameteri(mFBOTextureTarget, LOCAL_GL_TEXTURE_MAG_FILTER,
                              LOCAL_GL_LINEAR);
   mGLContext->fTexParameteri(mFBOTextureTarget, LOCAL_GL_TEXTURE_WRAP_S,
                              LOCAL_GL_CLAMP_TO_EDGE);
   mGLContext->fTexParameteri(mFBOTextureTarget, LOCAL_GL_TEXTURE_WRAP_T,
                              LOCAL_GL_CLAMP_TO_EDGE);
   mGLContext->fBindTexture(mFBOTextureTarget, 0);
   mGLContext->fGenFramebuffers(1, &fbo);
   *aFBO = fbo;
   *aTexture = tex;
 }
 ShaderConfigOGL
 CompositorOGL::GetShaderConfigFor(Effect *aEffect, MaskType aMask) const
 {
   ShaderConfigOGL config;
   switch(aEffect->mType) {
   case EFFECT_SOLID_COLOR:
     config.SetRenderColor(true);
     break;
   case EFFECT_YCBCR:
     config.SetYCbCr(true);
     break;
   case EFFECT_COMPONENT_ALPHA:
   {
     config.SetComponentAlpha(true);
     EffectComponentAlpha* effectComponentAlpha =
       static_cast<EffectComponentAlpha*>(aEffect);
     gfx::SurfaceFormat format = effectComponentAlpha->mOnWhite->GetFormat();
     config.SetRBSwap(format == gfx::SurfaceFormat::B8G8R8A8 ||
                      format == gfx::SurfaceFormat::B8G8R8X8);
     break;
   }
   case EFFECT_RENDER_TARGET:
     config.SetTextureTarget(mFBOTextureTarget);
     break;
   default:
   {
     MOZ_ASSERT(aEffect->mType == EFFECT_RGB);
     TexturedEffect* texturedEffect =
         static_cast<TexturedEffect*>(aEffect);
     TextureSourceOGL* source = texturedEffect->mTexture->AsSourceOGL();
     MOZ_ASSERT_IF(source->GetTextureTarget() == LOCAL_GL_TEXTURE_EXTERNAL,
                   source->GetFormat() == gfx::SurfaceFormat::R8G8B8A8);
     MOZ_ASSERT_IF(source->GetTextureTarget() == LOCAL_GL_TEXTURE_RECTANGLE_ARB,
                   source->GetFormat() == gfx::SurfaceFormat::R8G8B8A8 ||
                   source->GetFormat() == gfx::SurfaceFormat::R8G8B8X8 ||
                   source->GetFormat() == gfx::SurfaceFormat::R5G6B5);
     config = ShaderConfigFromTargetAndFormat(source->GetTextureTarget(),
                                              source->GetFormat());
     break;
   }
   }
   config.SetMask2D(aMask == Mask2d);
   config.SetMask3D(aMask == Mask3d);
   return config;
 }
 ShaderProgramOGL*
 CompositorOGL::GetShaderProgramFor(const ShaderConfigOGL &aConfig)
 {
   std::map<ShaderConfigOGL, ShaderProgramOGL *>::iterator iter = mPrograms.find(aConfig);
   if (iter != mPrograms.end())
     return iter->second;
   ProgramProfileOGL profile = ProgramProfileOGL::GetProfileFor(aConfig);
   ShaderProgramOGL *shader = new ShaderProgramOGL(gl(), profile);
   if (!shader->Initialize()) {
     delete shader;
     return nullptr;
   }
   mPrograms[aConfig] = shader;
   return shader;
 }
 void
 CompositorOGL::DrawLines(const std::vector<gfx::Point>& aLines, const gfx::Rect& aClipRect,
                          const gfx::Color& aColor,
                          gfx::Float aOpacity, const gfx::Matrix4x4 &aTransform)
 {
   mGLContext->fLineWidth(2.0);
   EffectChain effects;
   effects.mPrimaryEffect = new EffectSolidColor(aColor);
   for (int32_t i = 0; i < (int32_t)aLines.size() - 1; i++) {
     const gfx::Point& p1 = aLines[i];
     const gfx::Point& p2 = aLines[i+1];
     DrawQuadInternal(Rect(p1.x, p2.y, p2.x - p1.x, p1.y - p2.y),
                      aClipRect, effects, aOpacity, aTransform,
                      LOCAL_GL_LINE_STRIP);
   }
 }
 void
 CompositorOGL::DrawQuadInternal(const Rect& aRect,
                                 const Rect& aClipRect,
                                 const EffectChain &aEffectChain,
                                 Float aOpacity,
                                 const gfx::Matrix4x4 &aTransform,
                                 GLuint aDrawMode)
 {
   PROFILER_LABEL("CompositorOGL", "DrawQuad");
   MOZ_ASSERT(mFrameInProgress, "frame not started");
   Rect clipRect = aClipRect;
   if (!mTarget) {
     clipRect.MoveBy(mRenderOffset.x, mRenderOffset.y);
   }
   IntRect intClipRect;
   clipRect.ToIntRect(&intClipRect);
   gl()->fScissor(intClipRect.x, FlipY(intClipRect.y + intClipRect.height),
                  intClipRect.width, intClipRect.height);
   LayerScope::SendEffectChain(mGLContext, aEffectChain,
                               aRect.width, aRect.height);
   MaskType maskType;
   EffectMask* effectMask;
   TextureSourceOGL* sourceMask = nullptr;
   gfx::Matrix4x4 maskQuadTransform;
   if (aEffectChain.mSecondaryEffects[EFFECT_MASK]) {
     effectMask = static_cast<EffectMask*>(aEffectChain.mSecondaryEffects[EFFECT_MASK].get());
     sourceMask = effectMask->mMaskTexture->AsSourceOGL();
     // NS_ASSERTION(textureMask->IsAlpha(),
     //              "OpenGL mask layers must be backed by alpha surfaces");
     // We're assuming that the gl backend won't cheat and use NPOT
     // textures when glContext says it can't (which seems to happen
     // on a mac when you force POT textures)
     IntSize maskSize = CalculatePOTSize(effectMask->mSize, mGLContext);
     const gfx::Matrix4x4& maskTransform = effectMask->mMaskTransform;
     NS_ASSERTION(maskTransform.Is2D(), "How did we end up with a 3D transform here?!");
     Rect bounds = Rect(Point(), Size(maskSize));
     bounds = maskTransform.As2D().TransformBounds(bounds);
     maskQuadTransform._11 = 1.0f/bounds.width;
     maskQuadTransform._22 = 1.0f/bounds.height;
     maskQuadTransform._41 = float(-bounds.x)/bounds.width;
     maskQuadTransform._42 = float(-bounds.y)/bounds.height;
     maskType = effectMask->mIs3D
                  ? Mask3d
                  : Mask2d;
   } else {
     maskType = MaskNone;
   }
   mPixelsFilled += aRect.width * aRect.height;
   // Determine the color if this is a color shader and fold the opacity into
   // the color since color shaders don't have an opacity uniform.
   Color color;
   if (aEffectChain.mPrimaryEffect->mType == EFFECT_SOLID_COLOR) {
     EffectSolidColor* effectSolidColor =
       static_cast<EffectSolidColor*>(aEffectChain.mPrimaryEffect.get());
     color = effectSolidColor->mColor;
     Float opacity = aOpacity * color.a;
     color.r *= opacity;
     color.g *= opacity;
     color.b *= opacity;
     color.a = opacity;
     // We can fold opacity into the color, so no need to consider it further.
     aOpacity = 1.f;
   }
   ShaderConfigOGL config = GetShaderConfigFor(aEffectChain.mPrimaryEffect, maskType);
   config.SetOpacity(aOpacity != 1.f);
   ShaderProgramOGL *program = GetShaderProgramFor(config);
   program->Activate();
   program->SetProjectionMatrix(mProjMatrix);
   program->SetLayerQuadRect(aRect);
   program->SetLayerTransform(aTransform);
   IntPoint offset = mCurrentRenderTarget->GetOrigin();
   program->SetRenderOffset(offset.x, offset.y);
   if (aOpacity != 1.f)
     program->SetLayerOpacity(aOpacity);
   if (config.mFeatures & ENABLE_TEXTURE_RECT) {
     TexturedEffect* texturedEffect =
         static_cast<TexturedEffect*>(aEffectChain.mPrimaryEffect.get());
     TextureSourceOGL* source = texturedEffect->mTexture->AsSourceOGL();
     // This is used by IOSurface that use 0,0...w,h coordinate rather then 0,0..1,1.
     program->SetTexCoordMultiplier(source->GetSize().width, source->GetSize().height);
   }
   switch (aEffectChain.mPrimaryEffect->mType) {
     case EFFECT_SOLID_COLOR: {
       program->SetRenderColor(color);
       if (maskType != MaskNone) {
         BindMaskForProgram(program, sourceMask, LOCAL_GL_TEXTURE0, maskQuadTransform);
       }
       BindAndDrawQuad(program, aDrawMode);
     }
     break;
   case EFFECT_RGB: {
       TexturedEffect* texturedEffect =
           static_cast<TexturedEffect*>(aEffectChain.mPrimaryEffect.get());
       TextureSource *source = texturedEffect->mTexture;
       if (!texturedEffect->mPremultiplied) {
         mGLContext->fBlendFuncSeparate(LOCAL_GL_SRC_ALPHA, LOCAL_GL_ONE_MINUS_SRC_ALPHA,
                                        LOCAL_GL_ONE, LOCAL_GL_ONE);
       }
       gfx::Filter filter = texturedEffect->mFilter;
       gfx3DMatrix textureTransform;
       gfx::To3DMatrix(source->AsSourceOGL()->GetTextureTransform(), textureTransform);
 #ifdef MOZ_WIDGET_ANDROID
       gfxMatrix textureTransform2D;
       if (filter != gfx::Filter::POINT &&
           aTransform.Is2DIntegerTranslation() &&
           textureTransform.Is2D(&textureTransform2D) &&
           textureTransform2D.HasOnlyIntegerTranslation()) {
         // On Android we encounter small resampling errors in what should be
         // pixel-aligned compositing operations. This works around them. This
         // code should not be needed!
         filter = gfx::Filter::POINT;
       }
 #endif
       source->AsSourceOGL()->BindTexture(LOCAL_GL_TEXTURE0, filter);
       program->SetTextureUnit(0);
       if (maskType != MaskNone) {
         BindMaskForProgram(program, sourceMask, LOCAL_GL_TEXTURE1, maskQuadTransform);
       }
       BindAndDrawQuadWithTextureRect(program, textureTransform,
                                      texturedEffect->mTextureCoords, source);
       if (!texturedEffect->mPremultiplied) {
         mGLContext->fBlendFuncSeparate(LOCAL_GL_ONE, LOCAL_GL_ONE_MINUS_SRC_ALPHA,
                                        LOCAL_GL_ONE, LOCAL_GL_ONE);
       }
     }
     break;
   case EFFECT_YCBCR: {
       EffectYCbCr* effectYCbCr =
         static_cast<EffectYCbCr*>(aEffectChain.mPrimaryEffect.get());
       TextureSource* sourceYCbCr = effectYCbCr->mTexture;
       const int Y = 0, Cb = 1, Cr = 2;
       TextureSourceOGL* sourceY =  sourceYCbCr->GetSubSource(Y)->AsSourceOGL();
       TextureSourceOGL* sourceCb = sourceYCbCr->GetSubSource(Cb)->AsSourceOGL();
       TextureSourceOGL* sourceCr = sourceYCbCr->GetSubSource(Cr)->AsSourceOGL();
       if (!sourceY && !sourceCb && !sourceCr) {
         NS_WARNING("Invalid layer texture.");
         return;
       }
       sourceY->BindTexture(LOCAL_GL_TEXTURE0, effectYCbCr->mFilter);
       sourceCb->BindTexture(LOCAL_GL_TEXTURE1, effectYCbCr->mFilter);
       sourceCr->BindTexture(LOCAL_GL_TEXTURE2, effectYCbCr->mFilter);
       program->SetYCbCrTextureUnits(Y, Cb, Cr);
       if (maskType != MaskNone) {
         BindMaskForProgram(program, sourceMask, LOCAL_GL_TEXTURE3, maskQuadTransform);
       }
       BindAndDrawQuadWithTextureRect(program,
                                      gfx3DMatrix(),
                                      effectYCbCr->mTextureCoords,
                                      sourceYCbCr->GetSubSource(Y));
     }
     break;
   case EFFECT_RENDER_TARGET: {
       EffectRenderTarget* effectRenderTarget =
         static_cast<EffectRenderTarget*>(aEffectChain.mPrimaryEffect.get());
       RefPtr<CompositingRenderTargetOGL> surface
         = static_cast<CompositingRenderTargetOGL*>(effectRenderTarget->mRenderTarget.get());
       surface->BindTexture(LOCAL_GL_TEXTURE0, mFBOTextureTarget);
       // Drawing is always flipped, but when copying between surfaces we want to avoid
       // this, so apply a flip here to cancel the other one out.
       Matrix transform;
       transform.Translate(0.0, 1.0);
       transform.Scale(1.0f, -1.0f);
       program->SetTextureTransform(Matrix4x4::From2D(transform));
       program->SetTextureUnit(0);
       if (maskType != MaskNone) {
         sourceMask->BindTexture(LOCAL_GL_TEXTURE1, gfx::Filter::LINEAR);
         program->SetMaskTextureUnit(1);
         program->SetMaskLayerTransform(maskQuadTransform);
       }
       if (config.mFeatures & ENABLE_TEXTURE_RECT) {
         // 2DRect case, get the multiplier right for a sampler2DRect
         program->SetTexCoordMultiplier(aRect.width, aRect.height);
       }
       // Drawing is always flipped, but when copying between surfaces we want to avoid
       // this. Pass true for the flip parameter to introduce a second flip
       // that cancels the other one out.
       BindAndDrawQuad(program);
     }
     break;
   case EFFECT_COMPONENT_ALPHA: {
       MOZ_ASSERT(gfxPrefs::ComponentAlphaEnabled());
       EffectComponentAlpha* effectComponentAlpha =
         static_cast<EffectComponentAlpha*>(aEffectChain.mPrimaryEffect.get());
       TextureSourceOGL* sourceOnWhite = effectComponentAlpha->mOnWhite->AsSourceOGL();
       TextureSourceOGL* sourceOnBlack = effectComponentAlpha->mOnBlack->AsSourceOGL();
       if (!sourceOnBlack->IsValid() ||
           !sourceOnWhite->IsValid()) {
         NS_WARNING("Invalid layer texture for component alpha");
         return;
       }
       sourceOnBlack->BindTexture(LOCAL_GL_TEXTURE0, effectComponentAlpha->mFilter);
       sourceOnWhite->BindTexture(LOCAL_GL_TEXTURE1, effectComponentAlpha->mFilter);
       program->SetBlackTextureUnit(0);
       program->SetWhiteTextureUnit(1);
       program->SetTextureTransform(gfx::Matrix4x4());
       if (maskType != MaskNone) {
         BindMaskForProgram(program, sourceMask, LOCAL_GL_TEXTURE2, maskQuadTransform);
       }
       // Pass 1.
       gl()->fBlendFuncSeparate(LOCAL_GL_ZERO, LOCAL_GL_ONE_MINUS_SRC_COLOR,
                                LOCAL_GL_ONE, LOCAL_GL_ONE);
       program->SetTexturePass2(false);
       BindAndDrawQuadWithTextureRect(program,
                                      gfx3DMatrix(),
                                      effectComponentAlpha->mTextureCoords,
                                      effectComponentAlpha->mOnBlack);
       // Pass 2.
       gl()->fBlendFuncSeparate(LOCAL_GL_ONE, LOCAL_GL_ONE,
                                LOCAL_GL_ONE, LOCAL_GL_ONE);
 #ifdef XP_MACOSX
       if (gl()->WorkAroundDriverBugs() &&
           gl()->Vendor() == GLVendor::NVIDIA &&
           !nsCocoaFeatures::OnMavericksOrLater()) {
         // Bug 987497: With some GPUs the nvidia driver on 10.8 and below
         // won't pick up the TexturePass2 uniform change below if we don't do
         // something to force it. Re-activating the shader seems to be one way
         // of achieving that.
         program->Activate();
       }
 #endif
       program->SetTexturePass2(true);
       BindAndDrawQuadWithTextureRect(program,
                                      gfx3DMatrix(),
                                      effectComponentAlpha->mTextureCoords,
                                      effectComponentAlpha->mOnBlack);
       mGLContext->fBlendFuncSeparate(LOCAL_GL_ONE, LOCAL_GL_ONE_MINUS_SRC_ALPHA,
                                      LOCAL_GL_ONE, LOCAL_GL_ONE);
     }
     break;
   default:
     MOZ_ASSERT(false, "Unhandled effect type");
     break;
   }
   // in case rendering has used some other GL context
   MakeCurrent();
 }
 void
 CompositorOGL::EndFrame()
 {
   PROFILER_LABEL("CompositorOGL", "EndFrame");
   MOZ_ASSERT(mCurrentRenderTarget == mWindowRenderTarget, "Rendering target not properly restored");
 #ifdef MOZ_DUMP_PAINTING
   if (gfxUtils::sDumpPainting) {
     nsIntRect rect;
     if (mUseExternalSurfaceSize) {
       rect = nsIntRect(0, 0, mSurfaceSize.width, mSurfaceSize.height);
     } else {
       mWidget->GetBounds(rect);
     }
     RefPtr<DrawTarget> target = gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(IntSize(rect.width, rect.height), SurfaceFormat::B8G8R8A8);
     CopyToTarget(target, mCurrentRenderTarget->GetTransform());
     WriteSnapshotToDumpFile(this, target);
   }
 #endif
   mFrameInProgress = false;
   LayerScope::EndFrame(mGLContext);
   if (mTarget) {
     CopyToTarget(mTarget, mCurrentRenderTarget->GetTransform());
     mGLContext->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, 0);
     mCurrentRenderTarget = nullptr;
     return;
   }
   mCurrentRenderTarget = nullptr;
   if (mTexturePool) {
     mTexturePool->EndFrame();
   }
   mGLContext->SwapBuffers();
   mGLContext->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, 0);
   // Unbind all textures
   mGLContext->fActiveTexture(LOCAL_GL_TEXTURE0);
   mGLContext->fBindTexture(LOCAL_GL_TEXTURE_2D, 0);
   if (!mGLContext->IsGLES()) {
     mGLContext->fBindTexture(LOCAL_GL_TEXTURE_RECTANGLE_ARB, 0);
   }
   mGLContext->fActiveTexture(LOCAL_GL_TEXTURE1);
   mGLContext->fBindTexture(LOCAL_GL_TEXTURE_2D, 0);
   if (!mGLContext->IsGLES()) {
     mGLContext->fBindTexture(LOCAL_GL_TEXTURE_RECTANGLE_ARB, 0);
   }
   mGLContext->fActiveTexture(LOCAL_GL_TEXTURE2);
   mGLContext->fBindTexture(LOCAL_GL_TEXTURE_2D, 0);
   if (!mGLContext->IsGLES()) {
     mGLContext->fBindTexture(LOCAL_GL_TEXTURE_RECTANGLE_ARB, 0);
   }
 }
 #if defined(MOZ_WIDGET_GONK) && ANDROID_VERSION >= 17
 void
 CompositorOGL::SetFBAcquireFence(Layer* aLayer)
 {
   // OpenGL does not provide ReleaseFence for rendering.
   // Instead use FBAcquireFence as layer buffer's ReleaseFence
   // to prevent flickering and tearing.
   // FBAcquireFence is FramebufferSurface's AcquireFence.
   // AcquireFence will be signaled when a buffer's content is available.
   // See Bug 974152.
   if (!aLayer) {
     return;
   }
   const nsIntRegion& visibleRegion = aLayer->GetEffectiveVisibleRegion();
   if (visibleRegion.IsEmpty()) {
       return;
   }
   // Set FBAcquireFence on ContainerLayer's childs
   ContainerLayer* container = aLayer->AsContainerLayer();
   if (container) {
     for (Layer* child = container->GetFirstChild(); child; child = child->GetNextSibling()) {
       SetFBAcquireFence(child);
     }
     return;
   }
   // Set FBAcquireFence as tiles' ReleaseFence on TiledLayerComposer.
   TiledLayerComposer* composer = nullptr;
   LayerComposite* shadow = aLayer->AsLayerComposite();
   if (shadow) {
     composer = shadow->GetTiledLayerComposer();
     if (composer) {
       composer->SetReleaseFence(new android::Fence(GetGonkDisplay()->GetPrevFBAcquireFd()));
       return;
     }
   }
   // Set FBAcquireFence as layer buffer's ReleaseFence
   LayerRenderState state = aLayer->GetRenderState();
   if (!state.mTexture) {
     return;
   }
   TextureHostOGL* texture = state.mTexture->AsHostOGL();
   if (!texture) {
     return;
   }
   texture->SetReleaseFence(new android::Fence(GetGonkDisplay()->GetPrevFBAcquireFd()));
 }
 #else
 void
 CompositorOGL::SetFBAcquireFence(Layer* aLayer)
 {
 }
 #endif
 void
 CompositorOGL::EndFrameForExternalComposition(const gfx::Matrix& aTransform)
 {
   // This lets us reftest and screenshot content rendered externally
   if (mTarget) {
     MakeCurrent();
     CopyToTarget(mTarget, aTransform);
     mGLContext->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, 0);
   }
   if (mTexturePool) {
     mTexturePool->EndFrame();
   }
 }
 void
 CompositorOGL::AbortFrame()
 {
   mGLContext->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, 0);
   mFrameInProgress = false;
   mCurrentRenderTarget = nullptr;
   if (mTexturePool) {
     mTexturePool->EndFrame();
   }
 }
 void
 CompositorOGL::SetDestinationSurfaceSize(const gfx::IntSize& aSize)
 {
   mSurfaceSize.width = aSize.width;
   mSurfaceSize.height = aSize.height;
 }
 void
 CompositorOGL::CopyToTarget(DrawTarget *aTarget, const gfx::Matrix& aTransform)
 {
   IntRect rect;
   if (mUseExternalSurfaceSize) {
     rect = IntRect(0, 0, mSurfaceSize.width, mSurfaceSize.height);
   } else {
     rect = IntRect(0, 0, mWidgetSize.width, mWidgetSize.height);
   }
   GLint width = rect.width;
   GLint height = rect.height;
   if ((int64_t(width) * int64_t(height) * int64_t(4)) > INT32_MAX) {
     NS_ERROR("Widget size too big - integer overflow!");
     return;
   }
   mGLContext->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, 0);
   if (!mGLContext->IsGLES()) {
     // GLES2 promises that binding to any custom FBO will attach
     // to GL_COLOR_ATTACHMENT0 attachment point.
     mGLContext->fReadBuffer(LOCAL_GL_BACK);
   }
   RefPtr<DataSourceSurface> source =
         Factory::CreateDataSourceSurface(rect.Size(), gfx::SurfaceFormat::B8G8R8A8);
   DataSourceSurface::MappedSurface map;
   source->Map(DataSourceSurface::MapType::WRITE, &map);
   // XXX we should do this properly one day without using the gfxImageSurface
   nsRefPtr<gfxImageSurface> surf =
     new gfxImageSurface(map.mData,
                         gfxIntSize(width, height),
                         map.mStride,
                         gfxImageFormat::ARGB32);
   ReadPixelsIntoImageSurface(mGLContext, surf);
   source->Unmap();
   // Map from GL space to Cairo space and reverse the world transform.
   Matrix glToCairoTransform = aTransform;
   glToCairoTransform.Invert();
   glToCairoTransform.Scale(1.0, -1.0);
   glToCairoTransform.Translate(0.0, -height);
   Matrix oldMatrix = aTarget->GetTransform();
   aTarget->SetTransform(glToCairoTransform);
   Rect floatRect = Rect(rect.x, rect.y, rect.width, rect.height);
   aTarget->DrawSurface(source, floatRect, floatRect, DrawSurfaceOptions(), DrawOptions(1.0f, CompositionOp::OP_SOURCE));
   aTarget->SetTransform(oldMatrix);
   aTarget->Flush();
 }
 void
 CompositorOGL::Pause()
 {
 #ifdef MOZ_WIDGET_ANDROID
   if (!gl() || gl()->IsDestroyed())
     return;
   // ReleaseSurface internally calls MakeCurrent.
   gl()->ReleaseSurface();
 #endif
 }
 bool
 CompositorOGL::Resume()
 {
 #ifdef MOZ_WIDGET_ANDROID
   if (!gl() || gl()->IsDestroyed())
     return false;
   // RenewSurface internally calls MakeCurrent.
   return gl()->RenewSurface();
 #endif
   return true;
 }
 TemporaryRef<DataTextureSource>
 CompositorOGL::CreateDataTextureSource(TextureFlags aFlags)
 {
   RefPtr<DataTextureSource> result =
     new TextureImageTextureSourceOGL(mGLContext, aFlags);
   return result;
 }
 bool
 CompositorOGL::SupportsPartialTextureUpdate()
 {
   return CanUploadSubTextures(mGLContext);
 }
 int32_t
 CompositorOGL::GetMaxTextureSize() const
 {
   MOZ_ASSERT(mGLContext);
   GLint texSize = 0;
   mGLContext->fGetIntegerv(LOCAL_GL_MAX_TEXTURE_SIZE,
                             &texSize);
   MOZ_ASSERT(texSize != 0);
   return texSize;
 }
 void
 CompositorOGL::MakeCurrent(MakeCurrentFlags aFlags) {
   if (mDestroyed) {
     NS_WARNING("Call on destroyed layer manager");
     return;
   }
   mGLContext->MakeCurrent(aFlags & ForceMakeCurrent);
 }
 void
 CompositorOGL::BindQuadVBO() {
   mGLContext->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, mQuadVBO);
 }
 void
 CompositorOGL::QuadVBOVerticesAttrib(GLuint aAttribIndex) {
   mGLContext->fVertexAttribPointer(aAttribIndex, 2,
                                     LOCAL_GL_FLOAT, LOCAL_GL_FALSE, 0,
                                     (GLvoid*) QuadVBOVertexOffset());
 }
 void
 CompositorOGL::QuadVBOTexCoordsAttrib(GLuint aAttribIndex) {
   mGLContext->fVertexAttribPointer(aAttribIndex, 2,
                                     LOCAL_GL_FLOAT, LOCAL_GL_FALSE, 0,
                                     (GLvoid*) QuadVBOTexCoordOffset());
 }
 void
 CompositorOGL::BindAndDrawQuad(GLuint aVertAttribIndex,
                                GLuint aTexCoordAttribIndex,
                                GLuint aDrawMode)
 {
   BindQuadVBO();
   QuadVBOVerticesAttrib(aVertAttribIndex);
   if (aTexCoordAttribIndex != GLuint(-1)) {
     QuadVBOTexCoordsAttrib(aTexCoordAttribIndex);
     mGLContext->fEnableVertexAttribArray(aTexCoordAttribIndex);
   }
   mGLContext->fEnableVertexAttribArray(aVertAttribIndex);
   if (aDrawMode == LOCAL_GL_LINE_STRIP) {
     mGLContext->fDrawArrays(aDrawMode, 1, 2);
   } else {
     mGLContext->fDrawArrays(aDrawMode, 0, 4);
   }
 }
 void
 CompositorOGL::BindAndDrawQuad(ShaderProgramOGL *aProg,
                                GLuint aDrawMode)
 {
   NS_ASSERTION(aProg->HasInitialized(), "Shader program not correctly initialized");
   BindAndDrawQuad(aProg->AttribLocation(ShaderProgramOGL::VertexCoordAttrib),
                   aProg->AttribLocation(ShaderProgramOGL::TexCoordAttrib),
                   aDrawMode);
 }
 GLuint
 CompositorOGL::GetTemporaryTexture(GLenum aTarget, GLenum aUnit)
 {
   if (!mTexturePool) {
 #ifdef MOZ_WIDGET_GONK
     mTexturePool = new PerFrameTexturePoolOGL(gl());
 #else
     mTexturePool = new PerUnitTexturePoolOGL(gl());
 #endif
   }
   return mTexturePool->GetTexture(aTarget, aUnit);
 }
 GLuint
 PerUnitTexturePoolOGL::GetTexture(GLenum aTarget, GLenum aTextureUnit)
 {
   if (mTextureTarget == 0) {
     mTextureTarget = aTarget;
   }
   MOZ_ASSERT(mTextureTarget == aTarget);
   size_t index = aTextureUnit - LOCAL_GL_TEXTURE0;
   // lazily grow the array of temporary textures
   if (mTextures.Length() <= index) {
     size_t prevLength = mTextures.Length();
     mTextures.SetLength(index + 1);
     for(unsigned int i = prevLength; i <= index; ++i) {
       mTextures[i] = 0;
     }
   }
   // lazily initialize the temporary textures
   if (!mTextures[index]) {
     if (!mGL->MakeCurrent()) {
       return 0;
     }
     mGL->fGenTextures(1, &mTextures[index]);
     mGL->fBindTexture(aTarget, mTextures[index]);
     mGL->fTexParameteri(aTarget, LOCAL_GL_TEXTURE_WRAP_S, LOCAL_GL_CLAMP_TO_EDGE);
     mGL->fTexParameteri(aTarget, LOCAL_GL_TEXTURE_WRAP_T, LOCAL_GL_CLAMP_TO_EDGE);
   }
   return mTextures[index];
 }
 void
 PerUnitTexturePoolOGL::DestroyTextures()
 {
   if (mGL && mGL->MakeCurrent()) {
     if (mTextures.Length() > 0) {
       mGL->fDeleteTextures(mTextures.Length(), &mTextures[0]);
     }
   }
   mTextures.SetLength(0);
 }
 void
 PerFrameTexturePoolOGL::DestroyTextures()
 {
   if (!mGL->MakeCurrent()) {
     return;
   }
   if (mUnusedTextures.Length() > 0) {
     mGL->fDeleteTextures(mUnusedTextures.Length(), &mUnusedTextures[0]);
     mUnusedTextures.Clear();
   }
   if (mCreatedTextures.Length() > 0) {
     mGL->fDeleteTextures(mCreatedTextures.Length(), &mCreatedTextures[0]);
     mCreatedTextures.Clear();
   }
 }
 GLuint
 PerFrameTexturePoolOGL::GetTexture(GLenum aTarget, GLenum)
 {
   if (mTextureTarget == 0) {
     mTextureTarget = aTarget;
   }
   // The pool should always use the same texture target because it is illegal
   // to change the target of an already exisiting gl texture.
   // If we need to use several targets, a pool with several sub-pools (one per
   // target) will have to be implemented.
   // At the moment this pool is only used with tiling on b2g so we always need
   // the same target.
   MOZ_ASSERT(mTextureTarget == aTarget);
   GLuint texture = 0;
   if (!mUnusedTextures.IsEmpty()) {
     // Try to reuse one from the unused pile first
     texture = mUnusedTextures[0];
     mUnusedTextures.RemoveElementAt(0);
   } else if (mGL->MakeCurrent()) {
     // There isn't one to reuse, create one.
     mGL->fGenTextures(1, &texture);
     mGL->fBindTexture(aTarget, texture);
     mGL->fTexParameteri(aTarget, LOCAL_GL_TEXTURE_WRAP_S, LOCAL_GL_CLAMP_TO_EDGE);
     mGL->fTexParameteri(aTarget, LOCAL_GL_TEXTURE_WRAP_T, LOCAL_GL_CLAMP_TO_EDGE);
   }
   if (texture) {
     mCreatedTextures.AppendElement(texture);
   }
   return texture;
 }
 void
 PerFrameTexturePoolOGL::EndFrame()
 {
   if (!mGL->MakeCurrent()) {
     // this means the context got destroyed underneith us somehow, and the driver
     // already has destroyed the textures.
     mCreatedTextures.Clear();
     mUnusedTextures.Clear();
     return;
   }
   // Some platforms have issues unlocking Gralloc buffers even when they're
   // rebound.
   if (gfxPrefs::OverzealousGrallocUnlocking()) {
     mUnusedTextures.AppendElements(mCreatedTextures);
     mCreatedTextures.Clear();
   }
   // Delete unused textures
   for (size_t i = 0; i < mUnusedTextures.Length(); i++) {
     GLuint texture = mUnusedTextures[i];
     mGL->fDeleteTextures(1, &texture);
   }
   mUnusedTextures.Clear();
   // Move all created textures into the unused pile
   mUnusedTextures.AppendElements(mCreatedTextures);
   mCreatedTextures.Clear();
 }
 } /* layers */
 } /* mozilla */

The Tor Browser / annotate

gfx/layers/opengl/CompositorOGL.cpp@129ffea94266 (annotated)

gfx/layers/opengl/CompositorOGL.cpp