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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 "FontCascade.h"
#if USE(SKIA)
#include "FontCache.h"
#include "GraphicsContextSkia.h"
#include "SurrogatePairAwareTextIterator.h"
#include <skia/core/SkTextBlob.h>
#include <wtf/text/CharacterProperties.h>
namespace WebCore {
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN // GLib/Win port
void FontCascade::drawGlyphs(GraphicsContext& graphicsContext, const Font& font, std::span<const GlyphBufferGlyph> glyphs, std::span<const GlyphBufferAdvance> advances, const FloatPoint& position, FontSmoothingMode smoothingMode)
{
if (!font.platformData().size())
return;
const auto& fontPlatformData = font.platformData();
const auto& skFont = fontPlatformData.skFont();
if (!font.allowsAntialiasing())
smoothingMode = FontSmoothingMode::NoSmoothing;
SkFont::Edging edging;
switch (smoothingMode) {
case FontSmoothingMode::AutoSmoothing:
edging = skFont.getEdging();
break;
case FontSmoothingMode::Antialiased:
edging = SkFont::Edging::kAntiAlias;
break;
case FontSmoothingMode::SubpixelAntialiased:
edging = SkFont::Edging::kSubpixelAntiAlias;
break;
case FontSmoothingMode::NoSmoothing:
edging = SkFont::Edging::kAlias;
break;
}
bool isVertical = fontPlatformData.orientation() == FontOrientation::Vertical;
SkTextBlobBuilder builder;
const auto& buffer = [&]() {
if (skFont.getEdging() == edging)
return isVertical ? builder.allocRunPos(skFont, glyphs.size()) : builder.allocRunPosH(skFont, glyphs.size(), 0);
SkFont copiedFont = skFont;
copiedFont.setEdging(edging);
return isVertical ? builder.allocRunPos(copiedFont, glyphs.size()) : builder.allocRunPosH(copiedFont, glyphs.size(), 0);
}();
FloatSize glyphPosition;
for (size_t i = 0; i < glyphs.size(); ++i) {
buffer.glyphs[i] = glyphs[i];
if (isVertical) {
glyphPosition += advances[i];
buffer.pos[2 * i] = glyphPosition.height();
buffer.pos[2 * i + 1] = glyphPosition.width();
} else {
buffer.pos[i] = glyphPosition.width();
glyphPosition += advances[i];
}
}
auto blob = builder.make();
static_cast<GraphicsContextSkia*>(&graphicsContext)->drawSkiaText(blob, SkFloatToScalar(position.x()), SkFloatToScalar(position.y()), edging != SkFont::Edging::kAlias, isVertical);
}
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
bool FontCascade::canUseGlyphDisplayList(const RenderStyle&)
{
return true;
}
ResolvedEmojiPolicy FontCascade::resolveEmojiPolicy(FontVariantEmoji fontVariantEmoji, char32_t character)
{
switch (fontVariantEmoji) {
case FontVariantEmoji::Normal:
if (isEmojiWithPresentationByDefault(character)
|| isEmojiModifierBase(character)
|| isEmojiFitzpatrickModifier(character))
return ResolvedEmojiPolicy::RequireEmoji;
break;
case FontVariantEmoji::Unicode:
if (u_hasBinaryProperty(character, UCHAR_EMOJI))
return isEmojiWithPresentationByDefault(character) ? ResolvedEmojiPolicy::RequireEmoji : ResolvedEmojiPolicy::RequireText;
break;
case FontVariantEmoji::Text:
return ResolvedEmojiPolicy::RequireText;
case FontVariantEmoji::Emoji:
if (u_hasBinaryProperty(character, UCHAR_EMOJI))
return ResolvedEmojiPolicy::RequireEmoji;
}
return ResolvedEmojiPolicy::NoPreference;
}
RefPtr<const Font> FontCascade::fontForCombiningCharacterSequence(StringView stringView) const
{
ASSERT(!stringView.isEmpty());
auto codePoints = stringView.codePoints();
auto codePointsIterator = codePoints.begin();
char32_t baseCharacter = *codePointsIterator;
++codePointsIterator;
bool isOnlySingleCodePoint = codePointsIterator == codePoints.end();
auto [emojiPolicy, shouldForceEmojiFont] = [&]() -> std::pair<ResolvedEmojiPolicy, bool> {
if (!isOnlySingleCodePoint) {
if (*codePointsIterator == emojiVariationSelector)
return { ResolvedEmojiPolicy::RequireEmoji, true };
if (*codePointsIterator == textVariationSelector)
return { ResolvedEmojiPolicy::RequireText, false };
}
auto emojiPolicy = resolveEmojiPolicy(m_fontDescription.variantEmoji(), baseCharacter);
return { emojiPolicy, emojiPolicy == ResolvedEmojiPolicy::RequireEmoji && m_fontDescription.variantEmoji() == FontVariantEmoji::Emoji };
}();
char32_t baseCharacterForBaseFont = baseCharacter;
if (shouldForceEmojiFont) {
// System fallback doesn't support character sequences, so here we override
// the base character with the cat emoji to try to force an emoji font.
baseCharacterForBaseFont = emojiCat;
}
GlyphData baseCharacterGlyphData = glyphDataForCharacter(baseCharacterForBaseFont, false, NormalVariant, emojiPolicy);
if (!baseCharacterGlyphData.glyph)
return nullptr;
auto fontMatchesEmojiPolicy = [](const Font* font, ResolvedEmojiPolicy emojiPolicy) -> bool {
if (!font)
return false;
switch (emojiPolicy) {
case ResolvedEmojiPolicy::RequireEmoji:
return font->platformData().isColorBitmapFont();
case ResolvedEmojiPolicy::RequireText:
return !font->platformData().isColorBitmapFont();
case ResolvedEmojiPolicy::NoPreference:
break;
}
return true;
};
if (isOnlySingleCodePoint && !shouldForceEmojiFont && fontMatchesEmojiPolicy(baseCharacterGlyphData.font.get(), emojiPolicy))
return baseCharacterGlyphData.font.get();
bool triedBaseCharacterFont = false;
for (unsigned i = 0; !fallbackRangesAt(i).isNull(); ++i) {
auto& fontRanges = fallbackRangesAt(i);
if (fontRanges.isGenericFontFamily() && isPrivateUseAreaCharacter(baseCharacter))
continue;
const Font* font = fontRanges.fontForCharacter(baseCharacter);
if (!font)
continue;
if (!fontMatchesEmojiPolicy(font, emojiPolicy))
continue;
if (font == baseCharacterGlyphData.font)
triedBaseCharacterFont = true;
if (font->canRenderCombiningCharacterSequence(stringView))
return font;
}
if (!triedBaseCharacterFont && baseCharacterGlyphData.font && baseCharacterGlyphData.font->canRenderCombiningCharacterSequence(stringView))
return baseCharacterGlyphData.font.get();
bool clusterContainsOtherNonDefaultIgnorableCodePoints = [&] -> bool {
if (isOnlySingleCodePoint)
return false;
do {
if (!isDefaultIgnorableCodePoint(*codePointsIterator))
return true;
++codePointsIterator;
} while (codePointsIterator != codePoints.end());
return false;
}();
// Try a system fallback for the whole cluster if needed.
if (clusterContainsOtherNonDefaultIgnorableCodePoints) {
auto preferColoredFont = emojiPolicy == ResolvedEmojiPolicy::RequireEmoji ? FontCache::PreferColoredFont::Yes : FontCache::PreferColoredFont::No;
if (auto systemFallback = FontCache::forCurrentThread()->systemFallbackForCharacterCluster(m_fontDescription, fallbackRangesAt(0).fontForFirstRange(), IsForPlatformFont::No, preferColoredFont, stringView)) {
if (systemFallback->canRenderCombiningCharacterSequence(stringView))
return systemFallback.get();
}
}
return nullptr;
}
} // namespace WebCore
#endif // USE(SKIA)
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