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/*
* Copyright (C) 2006, 2007, 2008, 2013 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 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 "Font.h"
#include "FontCache.h"
#include "FloatRect.h"
#include "FontDescription.h"
#include "HWndDC.h"
#include <mlang.h>
#include <wtf/MathExtras.h>
#include <wtf/win/GDIObject.h>
namespace WebCore {
static bool g_shouldApplyMacAscentHack;
void Font::setShouldApplyMacAscentHack(bool b)
{
g_shouldApplyMacAscentHack = b;
}
bool Font::shouldApplyMacAscentHack()
{
return g_shouldApplyMacAscentHack;
}
float Font::ascentConsideringMacAscentHack(const WCHAR* faceName, float ascent, float descent)
{
if (!shouldApplyMacAscentHack())
return ascent;
// 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, L"Times") || !wcscmp(faceName, L"Helvetica") || !wcscmp(faceName, L"Courier"))
ascent += floorf(((ascent + descent) * 0.15f) + 0.5f);
return ascent;
}
void Font::initGDIFont()
{
if (!m_platformData.size()) {
m_fontMetrics.reset();
m_avgCharWidth = 0;
m_maxCharWidth = 0;
return;
}
HWndDC hdc(0);
HGDIOBJ oldFont = SelectObject(hdc, m_platformData.hfont());
OUTLINETEXTMETRIC metrics;
GetOutlineTextMetrics(hdc, sizeof(metrics), &metrics);
TEXTMETRIC& textMetrics = metrics.otmTextMetrics;
// FIXME: Needs to take OS/2 USE_TYPO_METRICS flag into account
// https://bugs.webkit.org/show_bug.cgi?id=199186
float ascent = textMetrics.tmAscent;
float descent = textMetrics.tmDescent;
float lineGap = textMetrics.tmExternalLeading;
m_fontMetrics.setAscent(ascent);
m_fontMetrics.setDescent(descent);
m_fontMetrics.setLineGap(lineGap);
m_fontMetrics.setLineSpacing(lroundf(ascent) + lroundf(descent) + lroundf(lineGap));
m_avgCharWidth = textMetrics.tmAveCharWidth;
m_maxCharWidth = textMetrics.tmMaxCharWidth;
float xHeight = ascent * 0.56f; // Best guess for xHeight if no x glyph is present.
GLYPHMETRICS gm;
static const MAT2 identity = { { 0, 1 }, { 0, 0 }, { 0, 0 }, { 0, 1 } };
DWORD len = GetGlyphOutline(hdc, 'x', GGO_METRICS, &gm, 0, 0, &identity);
if (len != GDI_ERROR && gm.gmptGlyphOrigin.y > 0)
xHeight = gm.gmptGlyphOrigin.y;
m_fontMetrics.setXHeight(xHeight);
m_fontMetrics.setUnitsPerEm(metrics.otmEMSquare);
SelectObject(hdc, oldFont);
}
void Font::platformCharWidthInit()
{
// GDI Fonts init charwidths in initGDIFont.
if (!m_platformData.useGDI()) {
m_avgCharWidth = 0.f;
m_maxCharWidth = 0.f;
initCharWidths();
}
}
void Font::platformDestroy()
{
ScriptFreeCache(&m_scriptCache);
delete m_scriptFontProperties;
}
RefPtr<Font> Font::platformCreateScaledFont(const FontDescription& fontDescription, float scaleFactor) const
{
float scaledSize = scaleFactor * m_platformData.size();
if (origin() == Origin::Remote)
return Font::create(FontPlatformData::cloneWithSize(m_platformData, scaledSize), Font::Origin::Remote);
LOGFONT winfont;
GetObject(m_platformData.hfont(), sizeof(LOGFONT), &winfont);
winfont.lfHeight = -lroundf(scaledSize * (m_platformData.useGDI() ? 1 : 32));
auto hfont = adoptGDIObject(::CreateFontIndirect(&winfont));
return Font::create(FontPlatformData(WTFMove(hfont), scaledSize, m_platformData.syntheticBold(), m_platformData.syntheticOblique(), m_platformData.useGDI()), origin());
}
void Font::determinePitch()
{
if (origin() == Origin::Remote) {
m_treatAsFixedPitch = false;
return;
}
// TEXTMETRICS have this. Set m_treatAsFixedPitch based off that.
HWndDC dc(0);
SaveDC(dc);
SelectObject(dc, m_platformData.hfont());
// Yes, this looks backwards, but the fixed pitch bit is actually set if the font
// is *not* fixed pitch. Unbelievable but true.
TEXTMETRIC tm;
GetTextMetrics(dc, &tm);
m_treatAsFixedPitch = ((tm.tmPitchAndFamily & TMPF_FIXED_PITCH) == 0);
RestoreDC(dc, -1);
}
FloatRect Font::boundsForGDIGlyph(Glyph glyph) const
{
HWndDC hdc(0);
SetGraphicsMode(hdc, GM_ADVANCED);
HGDIOBJ oldFont = SelectObject(hdc, m_platformData.hfont());
GLYPHMETRICS gdiMetrics;
static const MAT2 identity = { { 0, 1 }, { 0, 0 }, { 0, 0 }, { 0, 1 } };
GetGlyphOutline(hdc, glyph, GGO_METRICS | GGO_GLYPH_INDEX, &gdiMetrics, 0, 0, &identity);
SelectObject(hdc, oldFont);
return FloatRect(gdiMetrics.gmptGlyphOrigin.x, -gdiMetrics.gmptGlyphOrigin.y,
gdiMetrics.gmBlackBoxX + m_syntheticBoldOffset, gdiMetrics.gmBlackBoxY);
}
float Font::widthForGDIGlyph(Glyph glyph) const
{
HWndDC hdc(0);
SetGraphicsMode(hdc, GM_ADVANCED);
HGDIOBJ oldFont = SelectObject(hdc, m_platformData.hfont());
GLYPHMETRICS gdiMetrics;
static const MAT2 identity = { { 0, 1 }, { 0, 0 }, { 0, 0 }, { 0, 1 } };
GetGlyphOutline(hdc, glyph, GGO_METRICS | GGO_GLYPH_INDEX, &gdiMetrics, 0, 0, &identity);
float result = gdiMetrics.gmCellIncX + m_syntheticBoldOffset;
SelectObject(hdc, oldFont);
return result;
}
SCRIPT_FONTPROPERTIES* Font::scriptFontProperties() const
{
if (!m_scriptFontProperties) {
m_scriptFontProperties = new SCRIPT_FONTPROPERTIES;
memset(m_scriptFontProperties, 0, sizeof(SCRIPT_FONTPROPERTIES));
m_scriptFontProperties->cBytes = sizeof(SCRIPT_FONTPROPERTIES);
HRESULT result = ScriptGetFontProperties(0, scriptCache(), m_scriptFontProperties);
if (result == E_PENDING) {
HWndDC dc(0);
SaveDC(dc);
SelectObject(dc, m_platformData.hfont());
ScriptGetFontProperties(dc, scriptCache(), m_scriptFontProperties);
RestoreDC(dc, -1);
}
}
return m_scriptFontProperties;
}
} // namespace WebCore