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/*
* Copyright (C) 2024 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 "Font.h"
#include "GlyphBuffer.h"
#include "NotImplemented.h"
#include "PathSkia.h"
#include <skia/core/SkFont.h>
#include <skia/core/SkFontMetrics.h>
namespace WebCore {
Path Font::platformPathForGlyph(Glyph glyph) const
{
auto path = PathSkia::create();
const auto& font = m_platformData.skFont();
font.getPath(glyph, path->platformPath());
return { path };
}
FloatRect Font::platformBoundsForGlyph(Glyph glyph) const
{
if (!m_platformData.size())
return { };
const auto& font = m_platformData.skFont();
SkRect bounds;
font.getBounds(&glyph, 1, &bounds, nullptr);
if (!font.isSubpixel()) {
SkIRect rect;
bounds.roundOut(&rect);
bounds.set(rect);
}
return bounds;
}
float Font::platformWidthForGlyph(Glyph glyph) const
{
if (!m_platformData.size())
return 0;
const auto& font = m_platformData.skFont();
SkScalar width;
font.getWidths(&glyph, 1, &width);
if (!font.isSubpixel())
width = SkScalarRoundToInt(width);
return SkScalarToFloat(width);
}
void Font::platformInit()
{
if (!m_platformData.size())
return;
const auto& font = m_platformData.skFont();
SkFontMetrics metrics;
font.getMetrics(&metrics);
auto ascent = SkScalarRoundToScalar(-metrics.fAscent);
auto descent = SkScalarRoundToScalar(metrics.fDescent);
m_fontMetrics.setAscent(ascent);
m_fontMetrics.setDescent(descent);
auto lineGap = SkScalarToFloat(metrics.fLeading);
m_fontMetrics.setLineGap(lineGap);
m_fontMetrics.setLineSpacing(lroundf(ascent) + lroundf(descent) + lroundf(lineGap));
m_fontMetrics.setCapHeight(metrics.fCapHeight);
float underlinePosition;
if (metrics.hasUnderlinePosition(&underlinePosition))
m_fontMetrics.setUnderlinePosition(underlinePosition);
float underlineThickness;
if (metrics.hasUnderlineThickness(&underlineThickness))
m_fontMetrics.setUnderlineThickness(underlineThickness);
if (metrics.fXHeight)
m_fontMetrics.setXHeight(metrics.fXHeight);
m_maxCharWidth = SkScalarRoundToInt(metrics.fXMax - metrics.fXMin);
if (metrics.fAvgCharWidth)
m_avgCharWidth = SkScalarToFloat(metrics.fAvgCharWidth);
m_fontMetrics.setUnitsPerEm(font.getTypeface()->getUnitsPerEm());
SkString familyName;
font.getTypeface()->getFamilyName(&familyName);
if (equalIgnoringASCIICase(familyName.c_str(), "Ahem"_s))
m_allowsAntialiasing = false;
}
void Font::platformCharWidthInit()
{
m_avgCharWidth = 0.f;
m_maxCharWidth = 0.f;
initCharWidths();
}
RefPtr<Font> Font::platformCreateScaledFont(const FontDescription&, float scaleFactor) const
{
return Font::create(FontPlatformData(m_platformData.skFont().refTypeface(), scaleFactor * m_platformData.size(),
m_platformData.syntheticBold(),
m_platformData.syntheticOblique(),
m_platformData.orientation(),
m_platformData.widthVariant(),
m_platformData.textRenderingMode(),
Vector<hb_feature_t> { m_platformData.features() },
m_platformData.customPlatformData()),
origin(), IsInterstitial::No);
}
RefPtr<Font> Font::platformCreateHalfWidthFont() const
{
// FIXME: https://bugs.webkit.org/show_bug.cgi?id=281333 : implement half width font for this platform.
notImplemented();
return nullptr;
}
void Font::determinePitch()
{
m_treatAsFixedPitch = m_platformData.isFixedPitch();
}
bool Font::variantCapsSupportedForSynthesis(FontVariantCaps fontVariantCaps) const
{
switch (fontVariantCaps) {
case FontVariantCaps::Small:
case FontVariantCaps::Petite:
case FontVariantCaps::AllSmall:
case FontVariantCaps::AllPetite:
return false;
default:
// Synthesis only supports the variant-caps values listed above.
return true;
}
}
bool Font::platformSupportsCodePoint(char32_t character, std::optional<char32_t>) const
{
return m_platformData.skFont().getTypeface()->unicharToGlyph(character);
}
} // namespace WebCore
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