Source/WebCore/platform/graphics/win/FontPlatformDataCairoWin.cpp

/*
 * This file is part of the internal font implementation.  It should not be included by anyone other than
 * FontMac.cpp, FontWin.cpp and Font.cpp.
 *
 * Copyright (C) 2006-2008, 2016 Apple Inc.
 * Copyright (C) 2007 Alp Toker
 * Copyright (C) 2008, 2010, 2011 Brent Fulgham
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "FontPlatformData.h"

#include <wtf/HashMap.h>
#include <wtf/RetainPtr.h>
#include <wtf/Vector.h>
#include <wtf/text/StringHash.h>
#include <wtf/text/WTFString.h>

#include <cairo-win32.h>


namespace WebCore {

void FontPlatformData::platformDataInit(HFONT font, float size, HDC hdc, WCHAR* faceName)
{
    cairo_font_face_t* fontFace = cairo_win32_font_face_create_for_hfont(font);

    cairo_matrix_t sizeMatrix, ctm;
    cairo_matrix_init_identity(&ctm);
    cairo_matrix_init_scale(&sizeMatrix, size, size);

    static cairo_font_options_t* fontOptions = nullptr;
    if (!fontOptions) {
       fontOptions = cairo_font_options_create();
       cairo_font_options_set_antialias(fontOptions, CAIRO_ANTIALIAS_SUBPIXEL);
    }

    m_scaledFont = adoptRef(cairo_scaled_font_create(fontFace, &sizeMatrix, &ctm, fontOptions));
    cairo_font_face_destroy(fontFace);

    if (!m_useGDI && m_size)
        m_isSystemFont = !wcscmp(faceName, L"Lucida Grande");
}

FontPlatformData::FontPlatformData(GDIObject<HFONT> font, cairo_font_face_t* fontFace, float size, bool bold, bool oblique)
    : m_font(SharedGDIObject<HFONT>::create(WTFMove(font)))
    , m_size(size)
    , m_syntheticOblique(oblique)
{
    cairo_matrix_t fontMatrix;
    cairo_matrix_init_scale(&fontMatrix, size, size);
    cairo_matrix_t ctm;
    cairo_matrix_init_identity(&ctm);
    cairo_font_options_t* options = cairo_font_options_create();

    // We force antialiasing and disable hinting to provide consistent
    // typographic qualities for custom fonts on all platforms.
    cairo_font_options_set_hint_style(options, CAIRO_HINT_STYLE_NONE);
    cairo_font_options_set_antialias(options, CAIRO_ANTIALIAS_BEST);

    if (syntheticOblique()) {
        static const float syntheticObliqueSkew = -tanf(14 * acosf(0) / 90);
        cairo_matrix_t skew = {1, 0, syntheticObliqueSkew, 1, 0, 0};
        cairo_matrix_multiply(&fontMatrix, &skew, &fontMatrix);
    }

    m_scaledFont = adoptRef(cairo_scaled_font_create(fontFace, &fontMatrix, &ctm, options));
    cairo_font_options_destroy(options);
}

unsigned FontPlatformData::hash() const
{
    return PtrHash<cairo_scaled_font_t*>::hash(m_scaledFont.get());
}

bool FontPlatformData::platformIsEqual(const FontPlatformData& other) const
{
    return m_font == other.m_font
        && m_scaledFont == other.m_scaledFont
        && m_useGDI == other.m_useGDI;
}

}