Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/graphics/Canvas2DLayerBridge.cpp

Index: Source/core/platform/graphics/Canvas2DLayerBridge.cpp
diff --git a/Source/core/platform/graphics/Canvas2DLayerBridge.cpp b/Source/core/platform/graphics/Canvas2DLayerBridge.cpp
deleted file mode 100644
index f7e911ca33b2d907134986ca2b647367234e92f9..0000000000000000000000000000000000000000
--- a/Source/core/platform/graphics/Canvas2DLayerBridge.cpp
+++ /dev/null
@@ -1,425 +0,0 @@
-/*
- * 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
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-
-#include "core/platform/graphics/Canvas2DLayerBridge.h"
-
-#include "GrContext.h"
-#include "SkDevice.h"
-#include "SkSurface.h"
-#include "core/platform/graphics/Canvas2DLayerManager.h"
-#include "core/platform/graphics/GraphicsLayer.h"
-#include "core/platform/graphics/gpu/SharedGraphicsContext3D.h"
-#include "platform/TraceEvent.h"
-#include "public/platform/Platform.h"
-#include "public/platform/WebCompositorSupport.h"
-#include "public/platform/WebGraphicsContext3D.h"
-
-using blink::WebExternalTextureLayer;
-using blink::WebGraphicsContext3D;
-
-namespace WebCore {
-
-void Canvas2DLayerBridgePtr::clear()
-{
-    if (m_ptr) {
-        m_ptr->destroy();
-        m_ptr.clear();
-    }
-}
-
-Canvas2DLayerBridgePtr& Canvas2DLayerBridgePtr::operator=(const PassRefPtr<Canvas2DLayerBridge>& other)
-{
-    clear();
-    m_ptr = other;
-    return *this;
-}
-
-static SkSurface* createSurface(GraphicsContext3D* context3D, const IntSize& size, int msaaSampleCount)
-{
-    ASSERT(!context3D->webContext()->isContextLost());
-    GrContext* gr = context3D->grContext();
-    if (!gr)
-        return 0;
-    gr->resetContext();
-    SkImageInfo info;
-    info.fWidth = size.width();
-    info.fHeight = size.height();
-    info.fColorType = kPMColor_SkColorType;
-    info.fAlphaType = kPremul_SkAlphaType;
-    return SkSurface::NewRenderTarget(gr, info,  msaaSampleCount);
-}
-
-PassRefPtr<Canvas2DLayerBridge> Canvas2DLayerBridge::create(PassRefPtr<GraphicsContext3D> context, const IntSize& size, OpacityMode opacityMode, int msaaSampleCount)
-{
-    TRACE_EVENT_INSTANT0("test_gpu", "Canvas2DLayerBridgeCreation");
-    SkAutoTUnref<SkSurface> surface(createSurface(context.get(), size, msaaSampleCount));
-    if (!surface.get()) {
-        return PassRefPtr<Canvas2DLayerBridge>();
-    }
-    RefPtr<SkDeferredCanvas> canvas = adoptRef(SkDeferredCanvas::Create(surface.get()));
-    RefPtr<Canvas2DLayerBridge> layerBridge = adoptRef(new Canvas2DLayerBridge(context, canvas.release(), msaaSampleCount, opacityMode));
-    return layerBridge.release();
-}
-
-Canvas2DLayerBridge::Canvas2DLayerBridge(PassRefPtr<GraphicsContext3D> context, PassRefPtr<SkDeferredCanvas> canvas, int msaaSampleCount, OpacityMode opacityMode)
-    : m_canvas(canvas)
-    , m_context(context)
-    , m_msaaSampleCount(msaaSampleCount)
-    , m_bytesAllocated(0)
-    , m_didRecordDrawCommand(false)
-    , m_surfaceIsValid(true)
-    , m_framesPending(0)
-    , m_destructionInProgress(false)
-    , m_rateLimitingEnabled(false)
-    , m_next(0)
-    , m_prev(0)
-    , m_lastImageId(0)
-{
-    ASSERT(m_canvas);
-    // Used by browser tests to detect the use of a Canvas2DLayerBridge.
-    TRACE_EVENT_INSTANT0("test_gpu", "Canvas2DLayerBridgeCreation");
-    m_layer = adoptPtr(blink::Platform::current()->compositorSupport()->createExternalTextureLayer(this));
-    m_layer->setOpaque(opacityMode == Opaque);
-    m_layer->setBlendBackgroundColor(opacityMode != Opaque);
-    GraphicsLayer::registerContentsLayer(m_layer->layer());
-    m_layer->setRateLimitContext(m_rateLimitingEnabled);
-    m_canvas->setNotificationClient(this);
-}
-
-Canvas2DLayerBridge::~Canvas2DLayerBridge()
-{
-    ASSERT(m_destructionInProgress);
-    m_layer.clear();
-    Vector<MailboxInfo>::iterator mailboxInfo;
-    for (mailboxInfo = m_mailboxes.begin(); mailboxInfo < m_mailboxes.end(); mailboxInfo++) {
-        ASSERT(mailboxInfo->m_status != MailboxInUse);
-        if (mailboxInfo->m_status == MailboxReleased) {
-            if (mailboxInfo->m_mailbox.syncPoint) {
-                context()->waitSyncPoint(mailboxInfo->m_mailbox.syncPoint);
-                mailboxInfo->m_mailbox.syncPoint = 0;
-            }
-            // Invalidate texture state in case the compositor altered it since the copy-on-write.
-            mailboxInfo->m_image->getTexture()->invalidateCachedState();
-        }
-    }
-    m_mailboxes.clear();
-}
-
-void Canvas2DLayerBridge::destroy()
-{
-    ASSERT(!m_destructionInProgress);
-    m_destructionInProgress = true;
-    GraphicsLayer::unregisterContentsLayer(m_layer->layer());
-    m_canvas->setNotificationClient(0);
-    m_layer->clearTexture();
-    Canvas2DLayerManager::get().layerToBeDestroyed(this);
-    // Orphaning the layer is required to trigger the recration of a new layer
-    // in the case where destruction is caused by a canvas resize. Test:
-    // virtual/gpu/fast/canvas/canvas-resize-after-paint-without-layout.html
-    m_layer->layer()->removeFromParent();
-}
-
-void Canvas2DLayerBridge::limitPendingFrames()
-{
-    ASSERT(!m_destructionInProgress);
-    if (m_didRecordDrawCommand) {
-        m_framesPending++;
-        m_didRecordDrawCommand = false;
-        if (m_framesPending > 1) {
-            // Turn on the rate limiter if this layer tends to accumulate a
-            // non-discardable multi-frame backlog of draw commands.
-            setRateLimitingEnabled(true);
-        }
-        if (m_rateLimitingEnabled) {
-            flush();
-        }
-    }
-}
-
-void Canvas2DLayerBridge::prepareForDraw()
-{
-    ASSERT(!m_destructionInProgress);
-    ASSERT(m_layer);
-    if (!isValid()) {
-        if (m_canvas) {
-            // drop pending commands because there is no surface to draw to
-            m_canvas->silentFlush();
-        }
-        return;
-    }
-    m_context->makeContextCurrent();
-}
-
-void Canvas2DLayerBridge::storageAllocatedForRecordingChanged(size_t bytesAllocated)
-{
-    ASSERT(!m_destructionInProgress);
-    intptr_t delta = (intptr_t)bytesAllocated - (intptr_t)m_bytesAllocated;
-    m_bytesAllocated = bytesAllocated;
-    Canvas2DLayerManager::get().layerAllocatedStorageChanged(this, delta);
-}
-
-size_t Canvas2DLayerBridge::storageAllocatedForRecording()
-{
-    ASSERT(!m_destructionInProgress);
-    return m_canvas->storageAllocatedForRecording();
-}
-
-void Canvas2DLayerBridge::flushedDrawCommands()
-{
-    ASSERT(!m_destructionInProgress);
-    storageAllocatedForRecordingChanged(storageAllocatedForRecording());
-    m_framesPending = 0;
-}
-
-void Canvas2DLayerBridge::skippedPendingDrawCommands()
-{
-    ASSERT(!m_destructionInProgress);
-    // Stop triggering the rate limiter if SkDeferredCanvas is detecting
-    // and optimizing overdraw.
-    setRateLimitingEnabled(false);
-    flushedDrawCommands();
-}
-
-void Canvas2DLayerBridge::setRateLimitingEnabled(bool enabled)
-{
-    ASSERT(!m_destructionInProgress || !enabled);
-    if (m_rateLimitingEnabled != enabled) {
-        m_rateLimitingEnabled = enabled;
-        m_layer->setRateLimitContext(m_rateLimitingEnabled);
-    }
-}
-
-size_t Canvas2DLayerBridge::freeMemoryIfPossible(size_t bytesToFree)
-{
-    ASSERT(!m_destructionInProgress);
-    size_t bytesFreed = m_canvas->freeMemoryIfPossible(bytesToFree);
-    if (bytesFreed)
-        Canvas2DLayerManager::get().layerAllocatedStorageChanged(this, -((intptr_t)bytesFreed));
-    m_bytesAllocated -= bytesFreed;
-    return bytesFreed;
-}
-
-void Canvas2DLayerBridge::flush()
-{
-    ASSERT(!m_destructionInProgress);
-    if (m_canvas->hasPendingCommands()) {
-        TRACE_EVENT0("cc", "Canvas2DLayerBridge::flush");
-        m_canvas->flush();
-    }
-}
-
-WebGraphicsContext3D* Canvas2DLayerBridge::context()
-{
-    // Check on m_layer is necessary because context() may be called during
-    // the destruction of m_layer
-    if (m_layer) {
-        isValid(); // To ensure rate limiter is disabled if context is lost.
-    }
-    return m_context->webContext();
-}
-
-bool Canvas2DLayerBridge::isValid()
-{
-    ASSERT(m_layer);
-    if (m_destructionInProgress)
-        return false;
-    if (m_context->webContext()->isContextLost() || !m_surfaceIsValid) {
-        // Attempt to recover.
-        m_layer->clearTexture();
-        m_mailboxes.clear();
-        RefPtr<GraphicsContext3D> sharedContext = SharedGraphicsContext3D::get();
-        if (!sharedContext || sharedContext->webContext()->isContextLost()) {
-            m_surfaceIsValid = false;
-        } else {
-            m_context = sharedContext;
-            IntSize size(m_canvas->getTopDevice()->width(), m_canvas->getTopDevice()->height());
-            SkAutoTUnref<SkSurface> surface(createSurface(m_context.get(), size, m_msaaSampleCount));
-            if (surface.get()) {
-                m_canvas->setSurface(surface.get());
-                m_surfaceIsValid = true;
-                // FIXME: draw sad canvas picture into new buffer crbug.com/243842
-            } else {
-                // Surface allocation failed. Set m_surfaceIsValid to false to
-                // trigger subsequent retry.
-                m_surfaceIsValid = false;
-            }
-        }
-    }
-    if (!m_surfaceIsValid)
-        setRateLimitingEnabled(false);
-    return m_surfaceIsValid;
-}
-
-bool Canvas2DLayerBridge::prepareMailbox(blink::WebExternalTextureMailbox* outMailbox, blink::WebExternalBitmap* bitmap)
-{
-    if (bitmap) {
-        // Using accelerated 2d canvas with software renderer, which
-        // should only happen in tests that use fake graphics contexts.
-        // In this case, we do not care about producing any results for
-        // compositing.
-        m_canvas->silentFlush();
-        return false;
-    }
-    if (!isValid())
-        return false;
-    // Release to skia textures that were previouosly released by the
-    // compositor. We do this before acquiring the next snapshot in
-    // order to cap maximum gpu memory consumption.
-    m_context->makeContextCurrent();
-    flush();
-    Vector<MailboxInfo>::iterator mailboxInfo;
-    for (mailboxInfo = m_mailboxes.begin(); mailboxInfo < m_mailboxes.end(); mailboxInfo++) {
-        if (mailboxInfo->m_status == MailboxReleased) {
-            if (mailboxInfo->m_mailbox.syncPoint) {
-                context()->waitSyncPoint(mailboxInfo->m_mailbox.syncPoint);
-                mailboxInfo->m_mailbox.syncPoint = 0;
-            }
-            // Invalidate texture state in case the compositor altered it since the copy-on-write.
-            mailboxInfo->m_image->getTexture()->invalidateCachedState();
-            mailboxInfo->m_image.reset(0);
-            mailboxInfo->m_status = MailboxAvailable;
-        }
-    }
-    SkAutoTUnref<SkImage> image(m_canvas->newImageSnapshot());
-    // Early exit if canvas was not drawn to since last prepareMailbox
-    if (image->uniqueID() == m_lastImageId)
-        return false;
-    m_lastImageId = image->uniqueID();
-
-    mailboxInfo = createMailboxInfo();
-    mailboxInfo->m_status = MailboxInUse;
-    mailboxInfo->m_image.swap(&image);
-    // Because of texture sharing with the compositor, we must invalidate
-    // the state cached in skia so that the deferred copy on write
-    // in SkSurface_Gpu does not make any false assumptions.
-    mailboxInfo->m_image->getTexture()->invalidateCachedState();
-
-    ASSERT(mailboxInfo->m_mailbox.syncPoint == 0);
-    ASSERT(mailboxInfo->m_image.get());
-    ASSERT(mailboxInfo->m_image->getTexture());
-
-    m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, mailboxInfo->m_image->getTexture()->getTextureHandle());
-    m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
-    m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
-    m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
-    m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
-    context()->produceTextureCHROMIUM(GraphicsContext3D::TEXTURE_2D, mailboxInfo->m_mailbox.name);
-    context()->flush();
-    mailboxInfo->m_mailbox.syncPoint = context()->insertSyncPoint();
-    m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0);
-    // Because we are changing the texture binding without going through skia,
-    // we must dirty the context.
-    m_context->grContext()->resetContext(kTextureBinding_GrGLBackendState);
-
-    // set m_parentLayerBridge to make sure 'this' stays alive as long as it has
-    // live mailboxes
-    ASSERT(!mailboxInfo->m_parentLayerBridge);
-    mailboxInfo->m_parentLayerBridge = this;
-    *outMailbox = mailboxInfo->m_mailbox;
-    return true;
-}
-
-Canvas2DLayerBridge::MailboxInfo* Canvas2DLayerBridge::createMailboxInfo() {
-    ASSERT(!m_destructionInProgress);
-    MailboxInfo* mailboxInfo;
-    for (mailboxInfo = m_mailboxes.begin(); mailboxInfo < m_mailboxes.end(); mailboxInfo++) {
-        if (mailboxInfo->m_status == MailboxAvailable) {
-            return mailboxInfo;
-        }
-    }
-
-    // No available mailbox: create one.
-    m_mailboxes.grow(m_mailboxes.size() + 1);
-    mailboxInfo = &m_mailboxes.last();
-    context()->genMailboxCHROMIUM(mailboxInfo->m_mailbox.name);
-    // Worst case, canvas is triple buffered.  More than 3 active mailboxes
-    // means there is a problem.
-    // For the single-threaded case, this value needs to be at least
-    // kMaxSwapBuffersPending+1 (in render_widget.h).
-    // Because of crbug.com/247874, it needs to be kMaxSwapBuffersPending+2.
-    // TODO(piman): fix this.
-    ASSERT(m_mailboxes.size() <= 4);
-    ASSERT(mailboxInfo < m_mailboxes.end());
-    return mailboxInfo;
-}
-
-void Canvas2DLayerBridge::mailboxReleased(const blink::WebExternalTextureMailbox& mailbox)
-{
-    Vector<MailboxInfo>::iterator mailboxInfo;
-    for (mailboxInfo = m_mailboxes.begin(); mailboxInfo < m_mailboxes.end(); mailboxInfo++) {
-        if (!memcmp(mailboxInfo->m_mailbox.name, mailbox.name, sizeof(mailbox.name))) {
-            mailboxInfo->m_mailbox.syncPoint = mailbox.syncPoint;
-            ASSERT(mailboxInfo->m_status == MailboxInUse);
-            mailboxInfo->m_status = MailboxReleased;
-            // Trigger Canvas2DLayerBridge self-destruction if this is the
-            // last live mailbox and the layer bridge is not externally
-            // referenced.
-            ASSERT(mailboxInfo->m_parentLayerBridge.get() == this);
-            mailboxInfo->m_parentLayerBridge.clear();
-            return;
-        }
-    }
-}
-
-blink::WebLayer* Canvas2DLayerBridge::layer()
-{
-    ASSERT(m_layer);
-    return m_layer->layer();
-}
-
-void Canvas2DLayerBridge::contextAcquired()
-{
-    ASSERT(!m_destructionInProgress);
-    Canvas2DLayerManager::get().layerDidDraw(this);
-    m_didRecordDrawCommand = true;
-}
-
-unsigned Canvas2DLayerBridge::backBufferTexture()
-{
-    ASSERT(!m_destructionInProgress);
-    if (!isValid())
-        return 0;
-    contextAcquired();
-    m_canvas->flush();
-    m_context->flush();
-    GrRenderTarget* renderTarget = reinterpret_cast<GrRenderTarget*>(m_canvas->getDevice()->accessRenderTarget());
-    if (renderTarget) {
-        return renderTarget->asTexture()->getTextureHandle();
-    }
-    return 0;
-}
-
-Canvas2DLayerBridge::MailboxInfo::MailboxInfo(const MailboxInfo& other) {
-    // This copy constructor should only be used for Vector reallocation
-    // Assuming 'other' is to be destroyed, we swap m_image ownership
-    // rather than do a refcount dance.
-    memcpy(&m_mailbox, &other.m_mailbox, sizeof(m_mailbox));
-    m_image.swap(const_cast<SkAutoTUnref<SkImage>*>(&other.m_image));
-    m_status = other.m_status;
-}
-
-}