SkPictureCanvasLayerTextureUpdater.cpp   [plain text]

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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#include "config.h"

#if USE(ACCELERATED_COMPOSITING)

#include "SkPictureCanvasLayerTextureUpdater.h"

#include "GraphicsContext.h"
#include "LayerPainterChromium.h"
#include "PlatformContextSkia.h"
#include "SkCanvas.h"
#include "TraceEvent.h"

namespace WebCore {

SkPictureCanvasLayerTextureUpdater::SkPictureCanvasLayerTextureUpdater(PassOwnPtr<LayerPainterChromium> painter)
    : CanvasLayerTextureUpdater(painter)
    , m_layerIsOpaque(false)
{
}

SkPictureCanvasLayerTextureUpdater::~SkPictureCanvasLayerTextureUpdater()
{
}

void SkPictureCanvasLayerTextureUpdater::prepareToUpdate(const IntRect& contentRect, const IntSize& /* tileSize */, int borderTexels, float contentsScale, IntRect& resultingOpaqueRect)
{
    SkCanvas* canvas = m_picture.beginRecording(contentRect.width(), contentRect.height());
    PlatformContextSkia platformContext(canvas);
    platformContext.setDeferred(true);
    platformContext.setTrackOpaqueRegion(!m_layerIsOpaque);
    // Assumption: if a tiler is using border texels, then it is because the
    // layer is likely to be filtered or transformed. Because it might be
    // transformed, set image buffer flag to draw the text in grayscale
    // instead of using subpixel antialiasing.
    platformContext.setDrawingToImageBuffer(borderTexels ? true : false);
    GraphicsContext graphicsContext(&platformContext);
    paintContents(graphicsContext, platformContext, contentRect, contentsScale, resultingOpaqueRect);
    m_picture.endRecording();
}

void SkPictureCanvasLayerTextureUpdater::drawPicture(SkCanvas* canvas)
{
    TRACE_EVENT("SkPictureCanvasLayerTextureUpdater::drawPicture", this, 0);
    canvas->drawPicture(m_picture);
}

void SkPictureCanvasLayerTextureUpdater::setOpaque(bool opaque)
{
    m_layerIsOpaque = opaque;
}

} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)