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/*
* Copyright (C) 2006, 2007, 2008 Apple Inc. 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 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 "FloatRect.h"
#include "FontDescription.h"
#include "PlatformString.h"
#include <ApplicationServices/ApplicationServices.h>
#include <WebKitSystemInterface/WebKitSystemInterface.h>
#include <mlang.h>
#include <unicode/uchar.h>
#include <unicode/unorm.h>
#include <winsock2.h>
#include <wtf/MathExtras.h>
#include <wtf/RetainPtr.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);
unsigned unitsPerEm = CGFontGetUnitsPerEm(font);
float pointSize = m_platformData.size();
float fAscent = scaleEmToUnits(iAscent, unitsPerEm) * pointSize;
float fDescent = -scaleEmToUnits(iDescent, unitsPerEm) * pointSize;
float fLineGap = scaleEmToUnits(iLineGap, unitsPerEm) * pointSize;
if (!isCustomFont()) {
HDC dc = GetDC(0);
HGDIOBJ oldFont = SelectObject(dc, m_platformData.hfont());
int faceLength = GetTextFace(dc, 0, 0);
Vector<WCHAR> faceName(faceLength);
GetTextFace(dc, faceLength, faceName.data());
m_isSystemFont = !wcscmp(faceName.data(), L"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 (!wcscmp(faceName.data(), L"Times") || !wcscmp(faceName.data(), L"Helvetica") || !wcscmp(faceName.data(), L"Courier"))
fAscent += floorf(((fAscent + fDescent) * 0.15f) + 0.5f);
}
}
m_fontMetrics.setAscent(fAscent);
m_fontMetrics.setDescent(fDescent);
m_fontMetrics.setLineGap(fLineGap);
m_fontMetrics.setLineSpacing(lroundf(fAscent) + lroundf(fDescent) + lroundf(fLineGap));
// 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_fontMetrics.setXHeight(scaleEmToUnits(max(CGRectGetMaxX(xBox), CGRectGetMaxY(xBox)), unitsPerEm) * pointSize);
} else {
int iXHeight = CGFontGetXHeight(font);
m_fontMetrics.setXHeight(scaleEmToUnits(iXHeight, unitsPerEm) * pointSize);
}
m_fontMetrics.setUnitsPerEm(unitsPerEm);
}
void SimpleFontData::platformCharWidthInit()
{
// GDI Fonts init charwidths in initGDIFont.
if (!m_platformData.useGDI()) {
m_avgCharWidth = 0.f;
m_maxCharWidth = 0.f;
initCharWidths();
}
}
FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const
{
if (m_platformData.useGDI())
return boundsForGDIGlyph(glyph);
CGRect box;
CGFontGetGlyphBBoxes(m_platformData.cgFont(), &glyph, 1, &box);
float pointSize = m_platformData.size();
CGFloat scale = pointSize / fontMetrics().unitsPerEm();
FloatRect boundingBox = CGRectApplyAffineTransform(box, CGAffineTransformMakeScale(scale, -scale));
if (m_syntheticBoldOffset)
boundingBox.setWidth(boundingBox.width() + m_syntheticBoldOffset);
return boundingBox;
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
if (m_platformData.useGDI())
return widthForGDIGlyph(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);
return advance.width + m_syntheticBoldOffset;
}
}
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