/* | |
* Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
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* are met: | |
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* 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 | |
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*/ | |
#include "config.h" | |
#include "SimpleFontData.h" | |
#include <winsock2.h> | |
#include "Font.h" | |
#include "FontCache.h" | |
#include "FloatRect.h" | |
#include "FontDescription.h" | |
#include "PlatformString.h" | |
#include <wtf/MathExtras.h> | |
#include <wtf/RetainPtr.h> | |
#include <unicode/uchar.h> | |
#include <unicode/unorm.h> | |
#include <ApplicationServices/ApplicationServices.h> | |
#include <WebKitSystemInterface/WebKitSystemInterface.h> | |
#include <mlang.h> | |
#include <tchar.h> | |
namespace WebCore { | |
using std::max; | |
static inline float scaleEmToUnits(float x, unsigned unitsPerEm) { return unitsPerEm ? x / static_cast<float>(unitsPerEm) : x; } | |
void SimpleFontData::platformInit() | |
{ | |
m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f; | |
m_scriptCache = 0; | |
m_scriptFontProperties = 0; | |
m_isSystemFont = false; | |
if (m_platformData.useGDI()) | |
return initGDIFont(); | |
CGFontRef font = m_platformData.cgFont(); | |
int iAscent = CGFontGetAscent(font); | |
int iDescent = CGFontGetDescent(font); | |
int iLineGap = CGFontGetLeading(font); | |
m_unitsPerEm = CGFontGetUnitsPerEm(font); | |
float pointSize = m_platformData.size(); | |
float fAscent = scaleEmToUnits(iAscent, m_unitsPerEm) * pointSize; | |
float fDescent = -scaleEmToUnits(iDescent, m_unitsPerEm) * pointSize; | |
float fLineGap = scaleEmToUnits(iLineGap, m_unitsPerEm) * pointSize; | |
if (!isCustomFont()) { | |
HDC dc = GetDC(0); | |
HGDIOBJ oldFont = SelectObject(dc, m_platformData.hfont()); | |
int faceLength = GetTextFace(dc, 0, 0); | |
Vector<TCHAR> faceName(faceLength); | |
GetTextFace(dc, faceLength, faceName.data()); | |
m_isSystemFont = !_tcscmp(faceName.data(), _T("Lucida Grande")); | |
SelectObject(dc, oldFont); | |
ReleaseDC(0, dc); | |
if (shouldApplyMacAscentHack()) { | |
// This code comes from FontDataMac.mm. We only ever do this when running regression tests so that our metrics will match Mac. | |
// We need to adjust Times, Helvetica, and Courier to closely match the | |
// vertical metrics of their Microsoft counterparts that are the de facto | |
// web standard. The AppKit adjustment of 20% is too big and is | |
// incorrectly added to line spacing, so we use a 15% adjustment instead | |
// and add it to the ascent. | |
if (!_tcscmp(faceName.data(), _T("Times")) || !_tcscmp(faceName.data(), _T("Helvetica")) || !_tcscmp(faceName.data(), _T("Courier"))) | |
fAscent += floorf(((fAscent + fDescent) * 0.15f) + 0.5f); | |
} | |
} | |
m_ascent = lroundf(fAscent); | |
m_descent = lroundf(fDescent); | |
m_lineGap = lroundf(fLineGap); | |
m_lineSpacing = m_ascent + m_descent + m_lineGap; | |
// Measure the actual character "x", because AppKit synthesizes X height rather than getting it from the font. | |
// Unfortunately, NSFont will round this for us so we don't quite get the right value. | |
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page(); | |
Glyph xGlyph = glyphPageZero ? glyphPageZero->glyphDataForCharacter('x').glyph : 0; | |
if (xGlyph) { | |
CGRect xBox; | |
CGFontGetGlyphBBoxes(font, &xGlyph, 1, &xBox); | |
// Use the maximum of either width or height because "x" is nearly square | |
// and web pages that foolishly use this metric for width will be laid out | |
// poorly if we return an accurate height. Classic case is Times 13 point, | |
// which has an "x" that is 7x6 pixels. | |
m_xHeight = scaleEmToUnits(max(CGRectGetMaxX(xBox), CGRectGetMaxY(xBox)), m_unitsPerEm) * pointSize; | |
} else { | |
int iXHeight = CGFontGetXHeight(font); | |
m_xHeight = scaleEmToUnits(iXHeight, m_unitsPerEm) * pointSize; | |
} | |
} | |
void SimpleFontData::platformCharWidthInit() | |
{ | |
// GDI Fonts init charwidths in initGDIFont. | |
if (!m_platformData.useGDI()) { | |
m_avgCharWidth = 0.f; | |
m_maxCharWidth = 0.f; | |
initCharWidths(); | |
} | |
} | |
GlyphMetrics SimpleFontData::platformMetricsForGlyph(Glyph glyph, GlyphMetricsMode metricsMode) const | |
{ | |
if (m_platformData.useGDI()) | |
return metricsForGDIGlyph(glyph); | |
CGFontRef font = m_platformData.cgFont(); | |
float pointSize = m_platformData.size(); | |
CGSize advance; | |
CGAffineTransform m = CGAffineTransformMakeScale(pointSize, pointSize); | |
// FIXME: Need to add real support for printer fonts. | |
bool isPrinterFont = false; | |
wkGetGlyphAdvances(font, m, m_isSystemFont, isPrinterFont, glyph, advance); | |
GlyphMetrics metrics; | |
metrics.horizontalAdvance = advance.width + m_syntheticBoldOffset; | |
if (metricsMode == GlyphBoundingBox) { | |
CGRect boundingBox; | |
CGFontGetGlyphBBoxes(font, &glyph, 1, &boundingBox); | |
CGFloat scale = pointSize / unitsPerEm(); | |
metrics.boundingBox = CGRectApplyAffineTransform(boundingBox, CGAffineTransformMakeScale(scale, -scale)); | |
if (m_syntheticBoldOffset) | |
metrics.boundingBox.setWidth(metrics.boundingBox.width() + m_syntheticBoldOffset); | |
} | |
return metrics; | |
} | |
} |