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/*
* Copyright (C) 2005, 2008 Apple Computer, 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"
#if ENABLE(SVG_FONTS)
#include "SVGFontData.h"
#include "SVGFontFaceElement.h"
#endif
#include <wtf/MathExtras.h>
namespace WebCore {
SimpleFontData::SimpleFontData(const FontPlatformData& f, bool customFont, bool loading, SVGFontData* svgFontData)
: m_font(f)
, m_treatAsFixedPitch(false)
#if ENABLE(SVG_FONTS)
, m_svgFontData(svgFontData)
#endif
, m_isCustomFont(customFont)
, m_isLoading(loading)
, m_smallCapsFontData(0)
, m_zeroWidthFontData(new ZeroWidthFontData())
, m_cjkWidthFontData(new CJKWidthFontData())
{
#if ENABLE(SVG_FONTS) && !PLATFORM(QT)
if (SVGFontFaceElement* svgFontFaceElement = svgFontData ? svgFontData->svgFontFaceElement() : 0) {
m_unitsPerEm = svgFontFaceElement->unitsPerEm();
double scale = f.size();
if (m_unitsPerEm)
scale /= m_unitsPerEm;
m_ascent = static_cast<int>(svgFontFaceElement->ascent() * scale);
m_descent = static_cast<int>(svgFontFaceElement->descent() * scale);
// TODO(ojan): What should SVG fonts use for avgCharWidth/maxCharWidth?
// This is currently only used in RenderTextControl.cpp for the width
// of textareas with a non-fixed width.
m_avgCharWidth = 0;
m_maxCharWidth = 0;
m_xHeight = static_cast<int>(svgFontFaceElement->xHeight() * scale);
m_lineGap = 0.1f * f.size();
m_lineSpacing = m_ascent + m_descent + m_lineGap;
m_spaceGlyph = 0;
m_spaceWidth = 0;
m_adjustedSpaceWidth = 0;
determinePitch();
m_missingGlyphData.fontData = this;
m_missingGlyphData.glyph = 0;
m_zeroWidthFontData->init(this);
m_cjkWidthFontData->init(this);
return;
}
#endif
platformInit();
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
if (!glyphPageZero) {
LOG_ERROR("Failed to get glyph page zero.");
m_spaceGlyph = 0;
m_spaceWidth = 0;
m_adjustedSpaceWidth = 0;
determinePitch();
m_missingGlyphData.fontData = this;
m_missingGlyphData.glyph = 0;
m_zeroWidthFontData->init(this);
m_cjkWidthFontData->init(this);
return;
}
// 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.
static const UChar32 space_char = ' ';
m_spaceGlyph = glyphPageZero->glyphDataForCharacter(space_char).glyph;
float width = widthForGlyph(m_spaceGlyph);
m_spaceWidth = width;
determinePitch();
m_adjustedSpaceWidth = m_treatAsFixedPitch ? ceilf(width) : roundf(width);
// TODO(dglazkov): Investigate and implement across platforms, if needed
#if PLATFORM(WIN)
// ZERO WIDTH SPACES are explicitly mapped to share the glyph
// with SPACE (with width adjusted to 0) during GlyphPage::fill
// This is currently only implemented for Windows port. The FontData
// remapping may very well be needed for other platforms.
#else
// 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.
Glyph zeroWidthSpaceGlyph = glyphPageZero->glyphDataForCharacter(0).glyph;
if (zeroWidthSpaceGlyph) {
if (zeroWidthSpaceGlyph != m_spaceGlyph)
m_glyphToWidthMap.setWidthForGlyph(zeroWidthSpaceGlyph, 0);
else
LOG_ERROR("Font maps SPACE and ZERO WIDTH SPACE to the same glyph. Glyph width not overridden.");
}
#endif
m_missingGlyphData.fontData = this;
m_missingGlyphData.glyph = 0;
m_zeroWidthFontData->init(this);
m_cjkWidthFontData->init(this);
}
SimpleFontData::SimpleFontData()
: m_treatAsFixedPitch(false)
#if ENABLE(SVG_FONTS)
, m_svgFontData(0)
#endif
, m_isCustomFont(0)
, m_isLoading(0)
, m_smallCapsFontData(0)
{
}
SimpleFontData::~SimpleFontData()
{
#if ENABLE(SVG_FONTS) && !PLATFORM(QT)
if (!m_svgFontData || !m_svgFontData->svgFontFaceElement())
#endif
platformDestroy();
// We only get deleted when the cache gets cleared. Since the smallCapsRenderer is also in that cache,
// it will be deleted then, so we don't need to do anything here.
}
float SimpleFontData::widthForGlyph(Glyph glyph) const
{
float width = m_glyphToWidthMap.widthForGlyph(glyph);
if (width != cGlyphWidthUnknown)
return width;
width = platformWidthForGlyph(glyph);
m_glyphToWidthMap.setWidthForGlyph(glyph, width);
return width;
}
const SimpleFontData* SimpleFontData::fontDataForCharacter(UChar32) const
{
return this;
}
bool SimpleFontData::isSegmented() const
{
return false;
}
const SimpleFontData* SimpleFontData::zeroWidthFontData() const
{
return m_zeroWidthFontData.get();
}
const SimpleFontData* SimpleFontData::cjkWidthFontData() const
{
return m_cjkWidthFontData.get();
}
void ZeroWidthFontData::init(SimpleFontData* fontData)
{
m_font = fontData->m_font;
m_smallCapsFontData = fontData->m_smallCapsFontData;
m_ascent = fontData->m_ascent;
m_descent = fontData->m_descent;
m_lineSpacing = fontData->m_lineSpacing;
m_lineGap = fontData->m_lineGap;
m_maxCharWidth = 0;
m_avgCharWidth = 0;
m_xHeight = fontData->m_xHeight;
m_unitsPerEm = fontData->m_unitsPerEm;
m_spaceWidth = 0;
m_spaceGlyph = 0;
m_adjustedSpaceWidth = fontData->m_adjustedSpaceWidth;
#if PLATFORM(WIN)
m_scriptCache = 0;
m_scriptFontProperties = 0;
#endif
}
CJKWidthFontData::CJKWidthFontData()
: m_cjkGlyphWidth(cGlyphWidthUnknown)
{
}
float CJKWidthFontData::widthForGlyph(Glyph glyph) const
{
if (m_cjkGlyphWidth != cGlyphWidthUnknown)
return m_cjkGlyphWidth;
float width = platformWidthForGlyph(glyph);
m_cjkGlyphWidth = width;
#ifndef NDEBUG
// Test our optimization that assuming all CGK glyphs have the same width
const float actual_width = platformWidthForGlyph(glyph);
ASSERT((cGlyphWidthUnknown == width) || (actual_width == width));
#endif
return width;
}
// static
// TODO(dglazkov): Move to Font::isCJKCodePoint for consistency
bool SimpleFontData::isCJKCodePoint(UChar32 c)
{
// AC00..D7AF; Hangul Syllables
if ((0xAC00 <= c) && (c <= 0xD7AF))
return true;
// CJK ideographs
UErrorCode errorCode;
return uscript_getScript(c, &errorCode) == USCRIPT_HAN &&
U_SUCCESS(errorCode);
}
} // namespace WebCore
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