Source/WebCore/platform/graphics/cairo/FontCairo.cpp

/*
 * Copyright (C) 2006 Apple Inc.  All rights reserved.
 * Copyright (C) 2006 Michael Emmel mike.emmel@gmail.com
 * Copyright (C) 2007, 2008 Alp Toker <alp@atoker.com>
 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
 * Copyright (C) 2010 Holger Hans Peter Freyther
 * Copyright (C) 2014 Igalia S.L.
 *
 * 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 INC. ``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 INC. OR
 * 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 "FontCascade.h"

#if USE(CAIRO)

#include "AffineTransform.h"
#include "CairoOperations.h"
#include "CairoUtilities.h"
#include "Font.h"
#include "GlyphBuffer.h"
#include "Gradient.h"
#include "GraphicsContext.h"
#include "ImageBuffer.h"
#include "Pattern.h"
#include "PlatformContextCairo.h"
#include "PlatformPathCairo.h"
#include "ShadowBlur.h"

namespace WebCore {

void FontCascade::drawGlyphs(GraphicsContext& context, const Font& font, const GlyphBuffer& glyphBuffer,
    unsigned from, unsigned numGlyphs, const FloatPoint& point, FontSmoothingMode)
{
    if (!font.platformData().size())
        return;

    auto xOffset = point.x();
    Vector<cairo_glyph_t> glyphs(numGlyphs);
    {
        ASSERT(from + numGlyphs <= glyphBuffer.size());
        auto* glyphsData = glyphBuffer.glyphs(from);
        auto* advances = glyphBuffer.advances(from);

        auto yOffset = point.y();
        for (size_t i = 0; i < numGlyphs; ++i) {
            glyphs[i] = { glyphsData[i], xOffset, yOffset };
            xOffset += advances[i].width();
            yOffset -= advances[i].height();
        }
    }

    cairo_scaled_font_t* scaledFont = font.platformData().scaledFont();
    double syntheticBoldOffset = font.syntheticBoldOffset();

    ASSERT(context.hasPlatformContext());
    auto& state = context.state();
    Cairo::drawGlyphs(*context.platformContext(), Cairo::FillSource(state), Cairo::StrokeSource(state),
        Cairo::ShadowState(state), point, scaledFont, syntheticBoldOffset, glyphs, xOffset,
        state.textDrawingMode, state.strokeThickness, state.shadowOffset, state.shadowColor);
}

Path Font::platformPathForGlyph(Glyph glyph) const
{
    Path path;
    path.ensurePlatformPath();

    cairo_glyph_t cairoGlyph = { glyph, 0, 0 };
    cairo_set_scaled_font(path.platformPath()->context(), platformData().scaledFont());
    cairo_glyph_path(path.platformPath()->context(), &cairoGlyph, 1);

    float syntheticBoldOffset = this->syntheticBoldOffset();
    if (syntheticBoldOffset) {
        cairo_translate(path.platformPath()->context(), syntheticBoldOffset, 0);
        cairo_glyph_path(path.platformPath()->context(), &cairoGlyph, 1);
    }
    return path;
}

} // namespace WebCore

#endif // USE(CAIRO)