/src/qt/qtwebkit/Source/WebCore/platform/graphics/SimpleFontData.cpp
C++ | 304 lines | 226 code | 38 blank | 40 comment | 39 complexity | 51c2cb5d5d3b3fe02c5da069a4dbe459 MD5 | raw file
- /*
- * Copyright (C) 2005, 2008, 2010 Apple Inc. All rights reserved.
- * Copyright (C) 2006 Alexey Proskuryakov
- *
- * 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 Computer, 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.
- */
- #include "config.h"
- #include "SimpleFontData.h"
- #include "Font.h"
- #include "FontCache.h"
- #include <wtf/MathExtras.h>
- #if ENABLE(OPENTYPE_VERTICAL)
- #include "OpenTypeVerticalData.h"
- #endif
- using namespace std;
- namespace WebCore {
- const float smallCapsFontSizeMultiplier = 0.7f;
- const float emphasisMarkFontSizeMultiplier = 0.5f;
- SimpleFontData::SimpleFontData(const FontPlatformData& platformData, bool isCustomFont, bool isLoading, bool isTextOrientationFallback)
- : m_maxCharWidth(-1)
- , m_avgCharWidth(-1)
- , m_platformData(platformData)
- , m_treatAsFixedPitch(false)
- , m_isCustomFont(isCustomFont)
- , m_isLoading(isLoading)
- , m_isTextOrientationFallback(isTextOrientationFallback)
- , m_isBrokenIdeographFallback(false)
- #if ENABLE(OPENTYPE_VERTICAL)
- , m_verticalData(0)
- #endif
- , m_hasVerticalGlyphs(false)
- {
- platformInit();
- platformGlyphInit();
- platformCharWidthInit();
- #if ENABLE(OPENTYPE_VERTICAL)
- if (platformData.orientation() == Vertical && !isTextOrientationFallback) {
- m_verticalData = platformData.verticalData();
- m_hasVerticalGlyphs = m_verticalData.get() && m_verticalData->hasVerticalMetrics();
- }
- #endif
- }
- SimpleFontData::SimpleFontData(PassOwnPtr<AdditionalFontData> fontData, float fontSize, bool syntheticBold, bool syntheticItalic)
- : m_platformData(FontPlatformData(fontSize, syntheticBold, syntheticItalic))
- , m_fontData(fontData)
- , m_treatAsFixedPitch(false)
- , m_isCustomFont(true)
- , m_isLoading(false)
- , m_isTextOrientationFallback(false)
- , m_isBrokenIdeographFallback(false)
- #if ENABLE(OPENTYPE_VERTICAL)
- , m_verticalData(0)
- #endif
- , m_hasVerticalGlyphs(false)
- {
- m_fontData->initializeFontData(this, fontSize);
- }
- // Estimates of avgCharWidth and maxCharWidth for platforms that don't support accessing these values from the font.
- void SimpleFontData::initCharWidths()
- {
- GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
- // Treat the width of a '0' as the avgCharWidth.
- if (m_avgCharWidth <= 0.f && glyphPageZero) {
- static const UChar32 digitZeroChar = '0';
- Glyph digitZeroGlyph = glyphPageZero->glyphDataForCharacter(digitZeroChar).glyph;
- if (digitZeroGlyph)
- m_avgCharWidth = widthForGlyph(digitZeroGlyph);
- }
- // If we can't retrieve the width of a '0', fall back to the x height.
- if (m_avgCharWidth <= 0.f)
- m_avgCharWidth = m_fontMetrics.xHeight();
- if (m_maxCharWidth <= 0.f)
- m_maxCharWidth = max(m_avgCharWidth, m_fontMetrics.floatAscent());
- }
- void SimpleFontData::platformGlyphInit()
- {
- GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
- if (!glyphPageZero) {
- LOG_ERROR("Failed to get glyph page zero.");
- m_spaceGlyph = 0;
- m_spaceWidth = 0;
- m_zeroGlyph = 0;
- m_adjustedSpaceWidth = 0;
- determinePitch();
- m_zeroWidthSpaceGlyph = 0;
- m_missingGlyphData.fontData = this;
- m_missingGlyphData.glyph = 0;
- return;
- }
- m_zeroWidthSpaceGlyph = glyphPageZero->glyphDataForCharacter(0).glyph;
- // Nasty hack to determine if we should round or ceil space widths.
- // If the font is monospace or fake monospace we ceil to ensure that
- // every character and the space are the same width. Otherwise we round.
- m_spaceGlyph = glyphPageZero->glyphDataForCharacter(' ').glyph;
- float width = widthForGlyph(m_spaceGlyph);
- m_spaceWidth = width;
- m_zeroGlyph = glyphPageZero->glyphDataForCharacter('0').glyph;
- m_fontMetrics.setZeroWidth(widthForGlyph(m_zeroGlyph));
- determinePitch();
- m_adjustedSpaceWidth = m_treatAsFixedPitch ? ceilf(width) : roundf(width);
- // Force the glyph for ZERO WIDTH SPACE to have zero width, unless it is shared with SPACE.
- // Helvetica is an example of a non-zero width ZERO WIDTH SPACE glyph.
- // See <http://bugs.webkit.org/show_bug.cgi?id=13178>
- // Ask for the glyph for 0 to avoid paging in ZERO WIDTH SPACE. Control characters, including 0,
- // are mapped to the ZERO WIDTH SPACE glyph.
- if (m_zeroWidthSpaceGlyph == m_spaceGlyph) {
- m_zeroWidthSpaceGlyph = 0;
- LOG_ERROR("Font maps SPACE and ZERO WIDTH SPACE to the same glyph. Glyph width will not be overridden.");
- }
- m_missingGlyphData.fontData = this;
- m_missingGlyphData.glyph = 0;
- }
- SimpleFontData::~SimpleFontData()
- {
- if (!m_fontData)
- platformDestroy();
- if (isCustomFont())
- GlyphPageTreeNode::pruneTreeCustomFontData(this);
- else
- GlyphPageTreeNode::pruneTreeFontData(this);
- }
- const SimpleFontData* SimpleFontData::fontDataForCharacter(UChar32) const
- {
- return this;
- }
- Glyph SimpleFontData::glyphForCharacter(UChar32 character) const
- {
- GlyphPageTreeNode* node = GlyphPageTreeNode::getRootChild(this, character / GlyphPage::size);
- return node->page() ? node->page()->glyphAt(character % GlyphPage::size) : 0;
- }
- bool SimpleFontData::isSegmented() const
- {
- return false;
- }
- PassRefPtr<SimpleFontData> SimpleFontData::verticalRightOrientationFontData() const
- {
- if (!m_derivedFontData)
- m_derivedFontData = DerivedFontData::create(isCustomFont());
- if (!m_derivedFontData->verticalRightOrientation) {
- FontPlatformData verticalRightPlatformData(m_platformData);
- verticalRightPlatformData.setOrientation(Horizontal);
- m_derivedFontData->verticalRightOrientation = create(verticalRightPlatformData, isCustomFont(), false, true);
- }
- return m_derivedFontData->verticalRightOrientation;
- }
- PassRefPtr<SimpleFontData> SimpleFontData::uprightOrientationFontData() const
- {
- if (!m_derivedFontData)
- m_derivedFontData = DerivedFontData::create(isCustomFont());
- if (!m_derivedFontData->uprightOrientation)
- m_derivedFontData->uprightOrientation = create(m_platformData, isCustomFont(), false, true);
- return m_derivedFontData->uprightOrientation;
- }
- PassRefPtr<SimpleFontData> SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
- {
- if (!m_derivedFontData)
- m_derivedFontData = DerivedFontData::create(isCustomFont());
- if (!m_derivedFontData->smallCaps)
- m_derivedFontData->smallCaps = createScaledFontData(fontDescription, smallCapsFontSizeMultiplier);
- return m_derivedFontData->smallCaps;
- }
- PassRefPtr<SimpleFontData> SimpleFontData::emphasisMarkFontData(const FontDescription& fontDescription) const
- {
- if (!m_derivedFontData)
- m_derivedFontData = DerivedFontData::create(isCustomFont());
- if (!m_derivedFontData->emphasisMark)
- m_derivedFontData->emphasisMark = createScaledFontData(fontDescription, emphasisMarkFontSizeMultiplier);
- return m_derivedFontData->emphasisMark;
- }
- PassRefPtr<SimpleFontData> SimpleFontData::brokenIdeographFontData() const
- {
- if (!m_derivedFontData)
- m_derivedFontData = DerivedFontData::create(isCustomFont());
- if (!m_derivedFontData->brokenIdeograph) {
- m_derivedFontData->brokenIdeograph = create(m_platformData, isCustomFont(), false);
- m_derivedFontData->brokenIdeograph->m_isBrokenIdeographFallback = true;
- }
- return m_derivedFontData->brokenIdeograph;
- }
- PassRefPtr<SimpleFontData> SimpleFontData::nonSyntheticItalicFontData() const
- {
- if (!m_derivedFontData)
- m_derivedFontData = DerivedFontData::create(isCustomFont());
- if (!m_derivedFontData->nonSyntheticItalic) {
- FontPlatformData nonSyntheticItalicFontPlatformData(m_platformData);
- #if PLATFORM(MAC)
- nonSyntheticItalicFontPlatformData.m_syntheticOblique = false;
- #endif
- m_derivedFontData->nonSyntheticItalic = create(nonSyntheticItalicFontPlatformData, isCustomFont(), false, true);
- }
- return m_derivedFontData->nonSyntheticItalic;
- }
- #ifndef NDEBUG
- String SimpleFontData::description() const
- {
- if (isSVGFont())
- return "[SVG font]";
- if (isCustomFont())
- return "[custom font]";
- return platformData().description();
- }
- #endif
- PassOwnPtr<SimpleFontData::DerivedFontData> SimpleFontData::DerivedFontData::create(bool forCustomFont)
- {
- return adoptPtr(new DerivedFontData(forCustomFont));
- }
- SimpleFontData::DerivedFontData::~DerivedFontData()
- {
- if (!forCustomFont)
- return;
- if (smallCaps)
- GlyphPageTreeNode::pruneTreeCustomFontData(smallCaps.get());
- if (emphasisMark)
- GlyphPageTreeNode::pruneTreeCustomFontData(emphasisMark.get());
- if (brokenIdeograph)
- GlyphPageTreeNode::pruneTreeCustomFontData(brokenIdeograph.get());
- if (verticalRightOrientation)
- GlyphPageTreeNode::pruneTreeCustomFontData(verticalRightOrientation.get());
- if (uprightOrientation)
- GlyphPageTreeNode::pruneTreeCustomFontData(uprightOrientation.get());
- #if PLATFORM(MAC)
- if (compositeFontReferences) {
- CFDictionaryRef dictionary = CFDictionaryRef(compositeFontReferences.get());
- CFIndex count = CFDictionaryGetCount(dictionary);
- if (count > 0) {
- Vector<SimpleFontData*, 2> stash(count);
- SimpleFontData** fonts = stash.data();
- CFDictionaryGetKeysAndValues(dictionary, 0, (const void **)fonts);
- while (count-- > 0 && *fonts) {
- RefPtr<SimpleFontData> afont = adoptRef(*fonts++);
- GlyphPageTreeNode::pruneTreeCustomFontData(afont.get());
- }
- }
- }
- #endif
- }
- PassRefPtr<SimpleFontData> SimpleFontData::createScaledFontData(const FontDescription& fontDescription, float scaleFactor) const
- {
- // FIXME: Support scaled fonts that used AdditionalFontData.
- if (m_fontData)
- return 0;
- return platformCreateScaledFontData(fontDescription, scaleFactor);
- }
- } // namespace WebCore