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/*
* Copyright (C) 2006-2023 Apple Inc. All rights reserved.
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
*
* 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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.
*/
#pragma once
#include "Font.h"
#include "Glyph.h"
#include "TextFlags.h"
#include <unicode/utypes.h>
#include <wtf/BitSet.h>
#include <wtf/CheckedPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/Ref.h>
namespace WebCore {
// Holds the glyph index and the corresponding Font information for a given
// character.
struct GlyphData {
GlyphData(Glyph glyph = 0, const Font* font = nullptr, ColorGlyphType colorGlyphType = ColorGlyphType::Outline)
: glyph(glyph)
, colorGlyphType(colorGlyphType)
, font(font)
{
}
bool isValid() const { return !!font; }
Glyph glyph;
ColorGlyphType colorGlyphType;
SingleThreadWeakPtr<const Font> font;
};
// A GlyphPage contains a fixed-size set of GlyphData mappings for a contiguous
// range of characters in the Unicode code space. GlyphPages are indexed
// starting from 0 and incrementing for each "size" number of glyphs.
class GlyphPage final : public RefCounted<GlyphPage> {
public:
static Ref<GlyphPage> create(const Font& font)
{
return adoptRef(*new GlyphPage(font));
}
~GlyphPage()
{
--s_count;
}
static unsigned count() { return s_count; }
static constexpr unsigned size = 16;
static constexpr unsigned sizeForPageNumber(unsigned) { return size; }
static constexpr unsigned indexForCodePoint(char32_t c) { return c % size; }
static constexpr unsigned pageNumberForCodePoint(char32_t c) { return c / size; }
static constexpr char32_t startingCodePointInPageNumber(unsigned pageNumber) { return pageNumber * size; }
static constexpr bool pageNumberIsUsedForArabic(unsigned pageNumber) { return startingCodePointInPageNumber(pageNumber) >= 0x600 && startingCodePointInPageNumber(pageNumber) + sizeForPageNumber(pageNumber) < 0x700; }
GlyphData glyphDataForCharacter(char32_t c) const
{
return glyphDataForIndex(indexForCodePoint(c));
}
Glyph glyphForCharacter(char32_t c) const
{
return glyphForIndex(indexForCodePoint(c));
}
GlyphData glyphDataForIndex(unsigned index) const
{
Glyph glyph = glyphForIndex(index);
auto colorGlyphType = colorGlyphTypeForIndex(index);
return GlyphData(glyph, glyph ? m_font.get() : nullptr, colorGlyphType);
}
Glyph glyphForIndex(unsigned index) const
{
RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(index < size);
return m_glyphs[index];
}
ColorGlyphType colorGlyphTypeForIndex(unsigned index) const
{
RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(index < size);
return m_isColor.get(index) ? ColorGlyphType::Color : ColorGlyphType::Outline;
}
// FIXME: Pages are immutable after initialization. This should be private.
void setGlyphForIndex(unsigned index, Glyph glyph, ColorGlyphType colorGlyphType)
{
ASSERT_WITH_SECURITY_IMPLICATION(index < size);
m_glyphs[index] = glyph;
m_isColor.set(index, colorGlyphType == ColorGlyphType::Color);
}
const Font& font() const
{
return *m_font;
}
// Implemented by the platform.
bool fill(std::span<const UChar> characterBuffer);
private:
explicit GlyphPage(const Font& font)
: m_font(font)
{
++s_count;
}
SingleThreadWeakPtr<const Font> m_font;
std::array<Glyph, size> m_glyphs { };
WTF::BitSet<size> m_isColor;
WEBCORE_EXPORT static unsigned s_count;
};
} // namespace WebCore
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