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https://github.com/flutter/flutter.git
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263 lines
9.7 KiB
C++
263 lines
9.7 KiB
C++
/*
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* Copyright (C) 2005, 2008, 2010 Apple Inc. All rights reserved.
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* Copyright (C) 2006 Alexey Proskuryakov
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "flutter/sky/engine/platform/fonts/SimpleFontData.h"
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#include "flutter/sky/engine/wtf/MathExtras.h"
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namespace blink {
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const float smallCapsFontSizeMultiplier = 0.7f;
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const float emphasisMarkFontSizeMultiplier = 0.5f;
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SimpleFontData::SimpleFontData(const FontPlatformData& platformData, PassRefPtr<CustomFontData> customData, bool isTextOrientationFallback)
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: m_maxCharWidth(-1)
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, m_avgCharWidth(-1)
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, m_platformData(platformData)
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, m_treatAsFixedPitch(false)
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, m_isTextOrientationFallback(isTextOrientationFallback)
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, m_isBrokenIdeographFallback(false)
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#if ENABLE(OPENTYPE_VERTICAL)
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, m_verticalData(nullptr)
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#endif
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, m_hasVerticalGlyphs(false)
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, m_customFontData(customData)
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{
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platformInit();
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platformGlyphInit();
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platformCharWidthInit();
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#if ENABLE(OPENTYPE_VERTICAL)
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if (platformData.orientation() == Vertical && !isTextOrientationFallback) {
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m_verticalData = platformData.verticalData();
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m_hasVerticalGlyphs = m_verticalData.get() && m_verticalData->hasVerticalMetrics();
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}
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#endif
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}
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SimpleFontData::SimpleFontData(PassRefPtr<CustomFontData> customData, float fontSize, bool syntheticBold, bool syntheticItalic)
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: m_platformData(FontPlatformData(fontSize, syntheticBold, syntheticItalic))
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, m_treatAsFixedPitch(false)
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, m_isTextOrientationFallback(false)
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, m_isBrokenIdeographFallback(false)
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#if ENABLE(OPENTYPE_VERTICAL)
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, m_verticalData(nullptr)
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#endif
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, m_hasVerticalGlyphs(false)
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, m_customFontData(customData)
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{
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if (m_customFontData)
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m_customFontData->initializeFontData(this, fontSize);
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}
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// Estimates of avgCharWidth and maxCharWidth for platforms that don't support accessing these values from the font.
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void SimpleFontData::initCharWidths()
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{
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GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
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// Treat the width of a '0' as the avgCharWidth.
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if (m_avgCharWidth <= 0.f && glyphPageZero) {
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static const UChar32 digitZeroChar = '0';
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Glyph digitZeroGlyph = glyphPageZero->glyphForCharacter(digitZeroChar);
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if (digitZeroGlyph)
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m_avgCharWidth = widthForGlyph(digitZeroGlyph);
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}
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// If we can't retrieve the width of a '0', fall back to the x height.
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if (m_avgCharWidth <= 0.f)
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m_avgCharWidth = m_fontMetrics.xHeight();
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if (m_maxCharWidth <= 0.f)
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m_maxCharWidth = std::max(m_avgCharWidth, m_fontMetrics.floatAscent());
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}
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void SimpleFontData::platformGlyphInit()
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{
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GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
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if (!glyphPageZero) {
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WTF_LOG_ERROR("Failed to get glyph page zero.");
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m_spaceGlyph = 0;
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m_spaceWidth = 0;
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m_zeroGlyph = 0;
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determinePitch();
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m_zeroWidthSpaceGlyph = 0;
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m_missingGlyphData.fontData = this;
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m_missingGlyphData.glyph = 0;
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return;
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}
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m_zeroWidthSpaceGlyph = glyphPageZero->glyphForCharacter(0);
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// Nasty hack to determine if we should round or ceil space widths.
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// If the font is monospace or fake monospace we ceil to ensure that
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// every character and the space are the same width. Otherwise we round.
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m_spaceGlyph = glyphPageZero->glyphForCharacter(' ');
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float width = widthForGlyph(m_spaceGlyph);
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m_spaceWidth = width;
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m_zeroGlyph = glyphPageZero->glyphForCharacter('0');
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m_fontMetrics.setZeroWidth(widthForGlyph(m_zeroGlyph));
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determinePitch();
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// Force the glyph for ZERO WIDTH SPACE to have zero width, unless it is shared with SPACE.
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// Helvetica is an example of a non-zero width ZERO WIDTH SPACE glyph.
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// See <http://bugs.webkit.org/show_bug.cgi?id=13178>
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// Ask for the glyph for 0 to avoid paging in ZERO WIDTH SPACE. Control characters, including 0,
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// are mapped to the ZERO WIDTH SPACE glyph.
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if (m_zeroWidthSpaceGlyph == m_spaceGlyph) {
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m_zeroWidthSpaceGlyph = 0;
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}
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m_missingGlyphData.fontData = this;
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m_missingGlyphData.glyph = 0;
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}
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SimpleFontData::~SimpleFontData()
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{
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if (!isSVGFont())
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platformDestroy();
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if (isCustomFont())
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GlyphPageTreeNode::pruneTreeCustomFontData(this);
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else
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GlyphPageTreeNode::pruneTreeFontData(this);
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}
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const SimpleFontData* SimpleFontData::fontDataForCharacter(UChar32) const
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{
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return this;
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}
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Glyph SimpleFontData::glyphForCharacter(UChar32 character) const
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{
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// As GlyphPage::size is power of 2 so shifting is valid
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GlyphPageTreeNode* node = GlyphPageTreeNode::getRootChild(this, character >> GlyphPage::sizeBits);
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return node->page() ? node->page()->glyphAt(character & 0xFF) : 0;
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}
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bool SimpleFontData::isSegmented() const
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{
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return false;
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}
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PassRefPtr<SimpleFontData> SimpleFontData::verticalRightOrientationFontData() const
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{
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if (!m_derivedFontData)
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m_derivedFontData = DerivedFontData::create(isCustomFont());
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if (!m_derivedFontData->verticalRightOrientation) {
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FontPlatformData verticalRightPlatformData(m_platformData);
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verticalRightPlatformData.setOrientation(Horizontal);
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m_derivedFontData->verticalRightOrientation = create(verticalRightPlatformData, isCustomFont() ? CustomFontData::create(): nullptr, true);
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}
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return m_derivedFontData->verticalRightOrientation;
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}
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PassRefPtr<SimpleFontData> SimpleFontData::uprightOrientationFontData() const
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{
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if (!m_derivedFontData)
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m_derivedFontData = DerivedFontData::create(isCustomFont());
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if (!m_derivedFontData->uprightOrientation)
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m_derivedFontData->uprightOrientation = create(m_platformData, isCustomFont() ? CustomFontData::create(): nullptr, true);
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return m_derivedFontData->uprightOrientation;
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}
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PassRefPtr<SimpleFontData> SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
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{
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if (!m_derivedFontData)
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m_derivedFontData = DerivedFontData::create(isCustomFont());
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if (!m_derivedFontData->smallCaps)
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m_derivedFontData->smallCaps = createScaledFontData(fontDescription, smallCapsFontSizeMultiplier);
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return m_derivedFontData->smallCaps;
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}
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PassRefPtr<SimpleFontData> SimpleFontData::emphasisMarkFontData(const FontDescription& fontDescription) const
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{
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if (!m_derivedFontData)
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m_derivedFontData = DerivedFontData::create(isCustomFont());
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if (!m_derivedFontData->emphasisMark)
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m_derivedFontData->emphasisMark = createScaledFontData(fontDescription, emphasisMarkFontSizeMultiplier);
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return m_derivedFontData->emphasisMark;
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}
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PassRefPtr<SimpleFontData> SimpleFontData::brokenIdeographFontData() const
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{
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if (!m_derivedFontData)
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m_derivedFontData = DerivedFontData::create(isCustomFont());
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if (!m_derivedFontData->brokenIdeograph) {
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m_derivedFontData->brokenIdeograph = create(m_platformData, isCustomFont() ? CustomFontData::create(): nullptr);
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m_derivedFontData->brokenIdeograph->m_isBrokenIdeographFallback = true;
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}
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return m_derivedFontData->brokenIdeograph;
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}
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#ifndef NDEBUG
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String SimpleFontData::description() const
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{
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if (isSVGFont())
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return "[SVG font]";
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if (isCustomFont())
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return "[custom font]";
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return platformData().description();
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}
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#endif
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PassOwnPtr<SimpleFontData::DerivedFontData> SimpleFontData::DerivedFontData::create(bool forCustomFont)
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{
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return adoptPtr(new DerivedFontData(forCustomFont));
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}
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SimpleFontData::DerivedFontData::~DerivedFontData()
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{
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if (!forCustomFont)
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return;
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if (smallCaps)
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GlyphPageTreeNode::pruneTreeCustomFontData(smallCaps.get());
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if (emphasisMark)
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GlyphPageTreeNode::pruneTreeCustomFontData(emphasisMark.get());
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if (brokenIdeograph)
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GlyphPageTreeNode::pruneTreeCustomFontData(brokenIdeograph.get());
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if (verticalRightOrientation)
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GlyphPageTreeNode::pruneTreeCustomFontData(verticalRightOrientation.get());
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if (uprightOrientation)
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GlyphPageTreeNode::pruneTreeCustomFontData(uprightOrientation.get());
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}
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PassRefPtr<SimpleFontData> SimpleFontData::createScaledFontData(const FontDescription& fontDescription, float scaleFactor) const
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{
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// FIXME: Support scaled SVG fonts. Given that SVG is scalable in general this should be achievable.
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if (isSVGFont())
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return nullptr;
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return platformCreateScaledFontData(fontDescription, scaleFactor);
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}
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} // namespace blink
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