TiledBackingStoreBackendCairo.cpp   [plain text]


/*
 * Copyright (C) 2010 codeaurora.org All rights reserved.
 * Copyright (C) 2011 Collabora Ltd.
 * Copyright (C) 2011 Samsung Electronics
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#include "config.h"
#include "TiledBackingStoreBackend.h"

#if USE(TILED_BACKING_STORE) && USE(CAIRO)
#include "CairoUtilities.h"
#include "PlatformContextCairo.h"
#include "TileCairo.h"
#include <cairo.h>

namespace WebCore {

PassRefPtr<Tile> TiledBackingStoreBackend::createTile(TiledBackingStore* backingStore, const Tile::Coordinate& tileCoordinate)
{
    return TileCairo::create(backingStore, tileCoordinate);
}

static const unsigned checkerSize = 16;
static const unsigned checkerColorDarkGrey = 0xff555555;
static const unsigned checkerColorLightGrey = 0xffaaaaaa;

static cairo_surface_t* checkeredSurface()
{
    static cairo_surface_t* surface = 0;
    if (surface)
        return surface;

    surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, checkerSize, checkerSize);
    RefPtr<cairo_t> cr = adoptRef(cairo_create(surface));

    unsigned halfCheckerSize = checkerSize / 2;
    setSourceRGBAFromColor(cr.get(), checkerColorLightGrey);
    cairo_rectangle(cr.get(), 0, 0, halfCheckerSize, halfCheckerSize);
    cairo_rectangle(cr.get(), halfCheckerSize, halfCheckerSize, halfCheckerSize, halfCheckerSize);
    cairo_fill(cr.get());

    setSourceRGBAFromColor(cr.get(), checkerColorDarkGrey);
    cairo_rectangle(cr.get(), halfCheckerSize, 0, halfCheckerSize, halfCheckerSize);
    cairo_rectangle(cr.get(), 0, halfCheckerSize, halfCheckerSize, halfCheckerSize);
    cairo_fill(cr.get());

    return surface;
}

void TiledBackingStoreBackend::paintCheckerPattern(GraphicsContext* context, const FloatRect& target)
{
    PlatformContextCairo* platformContext = context->platformContext();
    cairo_t* cr = platformContext->cr();
    cairo_set_source_surface(cr, checkeredSurface(), 0, 0);
    cairo_pattern_set_extend(cairo_get_source(cr), CAIRO_EXTEND_REPEAT);
    cairo_rectangle(cr, target.x(), target.y(), target.width(), target.height());
    cairo_fill(cr);
}

}

#endif