Add some plumbing for the color management of canvases

third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 42 matching lines @@
 
 namespace {
 enum {
     InvalidMailboxIndex = -1,
     MaxCanvasAnimationBacklog = 2, // Make sure the the GPU is never more than two animation frames behind.
 };
 } // namespace
 
 namespace blink {
 
-static PassRefPtr<SkSurface> createSkSurface(GrContext* gr, const IntSize& size, int msaaSampleCount, OpacityMode opacityMode, bool* surfaceIsAccelerated)
+static PassRefPtr<SkSurface> createSkSurface(GrContext* gr, const IntSize& size, int msaaSampleCount, OpacityMode opacityMode, sk_sp<SkColorSpace> colorSpace, bool* surfaceIsAccelerated)
 {
     if (gr)
         gr->resetContext();
 
     SkAlphaType alphaType = (Opaque == opacityMode) ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
-    SkImageInfo info = SkImageInfo::MakeN32(size.width(), size.height(), alphaType);
+    SkImageInfo info = SkImageInfo::MakeN32(size.width(), size.height(), alphaType, colorSpace);
     SkSurfaceProps disableLCDProps(0, kUnknown_SkPixelGeometry);
     sk_sp<SkSurface> surface;
 
     if (gr) {
         *surfaceIsAccelerated = true;
         surface = SkSurface::MakeRenderTarget(gr, SkBudgeted::kNo, info, msaaSampleCount, Opaque == opacityMode ? 0 : &disableLCDProps);
     }
 
     if (!surface) {
         *surfaceIsAccelerated = false;
         surface = SkSurface::MakeRaster(info, Opaque == opacityMode ? 0 : &disableLCDProps);
     }
 
     if (surface) {
         if (opacityMode == Opaque) {
             surface->getCanvas()->clear(SK_ColorBLACK);
         } else {
             surface->getCanvas()->clear(SK_ColorTRANSPARENT);
         }
     }
     return fromSkSp(surface);
 }
 
-Canvas2DLayerBridge::Canvas2DLayerBridge(std::unique_ptr<WebGraphicsContext3DProvider> contextProvider, const IntSize& size, int msaaSampleCount, OpacityMode opacityMode, AccelerationMode accelerationMode)
+Canvas2DLayerBridge::Canvas2DLayerBridge(std::unique_ptr<WebGraphicsContext3DProvider> contextProvider, const IntSize& size, int msaaSampleCount, OpacityMode opacityMode, AccelerationMode accelerationMode, sk_sp<SkColorSpace> colorSpace)
     : m_contextProvider(std::move(contextProvider))
     , m_logger(wrapUnique(new Logger))
     , m_weakPtrFactory(this)
     , m_imageBuffer(0)
     , m_msaaSampleCount(msaaSampleCount)
     , m_bytesAllocated(0)
     , m_haveRecordedDrawCommands(false)
     , m_destructionInProgress(false)
     , m_filterQuality(kLow_SkFilterQuality)
     , m_isHidden(false)
     , m_isDeferralEnabled(true)
     , m_isRegisteredTaskObserver(false)
     , m_renderingTaskCompletedForCurrentFrame(false)
     , m_softwareRenderingWhileHidden(false)
     , m_lastImageId(0)
     , m_lastFilter(GL_LINEAR)
     , m_accelerationMode(accelerationMode)
     , m_opacityMode(opacityMode)
     , m_size(size)
+    , m_colorSpace(colorSpace)
 {
     DCHECK(m_contextProvider);
     DCHECK(!m_contextProvider->isSoftwareRendering());
     // Used by browser tests to detect the use of a Canvas2DLayerBridge.
     TRACE_EVENT_INSTANT0("test_gpu", "Canvas2DLayerBridgeCreation", TRACE_EVENT_SCOPE_GLOBAL);
     startRecording();
 }
 
 Canvas2DLayerBridge::~Canvas2DLayerBridge()
 {
@@ skipping 335 matching lines @@
         return nullptr; // re-creation will happen through restore()
     }
 
     bool wantAcceleration = shouldAccelerate(hint);
     if (CANVAS2D_BACKGROUND_RENDER_SWITCH_TO_CPU && isHidden() && wantAcceleration) {
         wantAcceleration = false;
         m_softwareRenderingWhileHidden = true;
     }
 
     bool surfaceIsAccelerated;
-    m_surface = createSkSurface(wantAcceleration ? m_contextProvider->grContext() : nullptr, m_size, m_msaaSampleCount, m_opacityMode, &surfaceIsAccelerated);
+    m_surface = createSkSurface(wantAcceleration ? m_contextProvider->grContext() : nullptr, m_size, m_msaaSampleCount, m_opacityMode, m_colorSpace, &surfaceIsAccelerated);
 
     if (!m_surface)
         reportSurfaceCreationFailure();
 
     if (m_surface && surfaceIsAccelerated && !m_layer) {
         m_layer = wrapUnique(Platform::current()->compositorSupport()->createExternalTextureLayer(this));
         m_layer->setOpaque(m_opacityMode == Opaque);
         m_layer->setBlendBackgroundColor(m_opacityMode != Opaque);
         GraphicsLayer::registerContentsLayer(m_layer->layer());
         m_layer->setNearestNeighbor(m_filterQuality == kNone_SkFilterQuality);
@@ skipping 256 matching lines @@
 
     gpu::gles2::GLES2Interface* sharedGL = nullptr;
     m_layer->clearTexture();
     m_contextProvider = wrapUnique(Platform::current()->createSharedOffscreenGraphicsContext3DProvider());
     if (m_contextProvider)
         sharedGL = m_contextProvider->contextGL();
 
     if (sharedGL && sharedGL->GetGraphicsResetStatusKHR() == GL_NO_ERROR) {
         GrContext* grCtx = m_contextProvider->grContext();
         bool surfaceIsAccelerated;
-        RefPtr<SkSurface> surface(createSkSurface(grCtx, m_size, m_msaaSampleCount, m_opacityMode, &surfaceIsAccelerated));
+        RefPtr<SkSurface> surface(createSkSurface(grCtx, m_size, m_msaaSampleCount, m_opacityMode, m_colorSpace, &surfaceIsAccelerated));
 
         if (!m_surface)
             reportSurfaceCreationFailure();
 
         // Current paradigm does support switching from accelerated to non-accelerated, which would be tricky
         // due to changes to the layer tree, which can only happen at specific times during the document lifecycle.
         // Therefore, we can only accept the restored surface if it is accelerated.
         if (surface && surfaceIsAccelerated) {
             m_surface = surface.release();
             // FIXME: draw sad canvas picture into new buffer crbug.com/243842
         }
     }
     if (m_imageBuffer)
         m_imageBuffer->updateGPUMemoryUsage();
 
     return m_surface.get();
 }
 
+static gfx::ColorSpace SkColorSpaceToColorSpace(const SkColorSpace* skColorSpace)
+{
+    // TODO(crbug.com/634102): Eliminate this clumsy conversion by unifying
+    // SkColorSpace and gfx::ColorSpace.
+    if (!skColorSpace)
+        return gfx::ColorSpace();
+
+    gfx::ColorSpace::TransferID transferID = gfx::ColorSpace::TransferID::UNSPECIFIED;
+    switch (skColorSpace->gammaNamed()) {
+    case SkColorSpace::kSRGB_GammaNamed:
+        transferID = gfx::ColorSpace::TransferID::IEC61966_2_1;
+        break;
+    case SkColorSpace::kLinear_GammaNamed:
+        transferID = gfx::ColorSpace::TransferID::LINEAR;
+        break;
+    default:
+        // TODO(crbug.com/634102): Not all curve type are supported
+        DCHECK(false);
+    }
+
+    // TODO(crbug.com/634102): No primary conversions are performed.
+    // Rec-709 is assumed.
+    return gfx::ColorSpace(gfx::ColorSpace::PrimaryID::BT709, transferID, gfx::ColorSpace::MatrixID::RGB, gfx::ColorSpace::RangeID::FULL);
+}
+
 bool Canvas2DLayerBridge::PrepareTextureMailbox(
     cc::TextureMailbox* outMailbox,
     std::unique_ptr<cc::SingleReleaseCallback>* outReleaseCallback)
 {
     if (m_destructionInProgress) {
         // It can be hit in the following sequence.
         // 1. Canvas draws something.
         // 2. The compositor begins the frame.
         // 3. Javascript makes a context be lost.
         // 4. Here.
@@ skipping 19 matching lines @@
     // Early exit if canvas was not drawn to since last prepareMailbox.
     GLenum filter = getGLFilter();
     if (image->uniqueID() == m_lastImageId && filter == m_lastFilter)
         return false;
     m_lastImageId = image->uniqueID();
     m_lastFilter = filter;
 
     if (!prepareMailboxFromImage(image.release(), outMailbox))
         return false;
     outMailbox->set_nearest_neighbor(getGLFilter() == GL_NEAREST);
+    gfx::ColorSpace colorSpace = SkColorSpaceToColorSpace(m_colorSpace.get());
+    outMailbox->set_color_space(colorSpace);
 
     auto func = WTF::bind(&Canvas2DLayerBridge::mailboxReleased,
         m_weakPtrFactory.createWeakPtr(),
         outMailbox->mailbox());
     *outReleaseCallback = cc::SingleReleaseCallback::Create(
         convertToBaseCallback(std::move(func)));
     return true;
 }
 
 void Canvas2DLayerBridge::mailboxReleased(const gpu::Mailbox& mailbox,
@@ skipping 172 matching lines @@
 Canvas2DLayerBridge::MailboxInfo::MailboxInfo() = default;
 Canvas2DLayerBridge::MailboxInfo::MailboxInfo(const MailboxInfo& other) = default;
 
 void Canvas2DLayerBridge::Logger::reportHibernationEvent(HibernationEvent event)
 {
     DEFINE_STATIC_LOCAL(EnumerationHistogram, hibernationHistogram, ("Canvas.HibernationEvents", HibernationEventCount));
     hibernationHistogram.count(event);
 }
 
 } // namespace blink