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/*
* Copyright (C) 2006, 2007 Apple Inc. All Rights Reserved.
* Copyright (c) 2008, 2009, Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 "FloatRect.h"
#include "Font.h"
#include "FontCache.h"
#include "FontDescription.h"
#include "FontPlatformDataChromiumWin.h"
#include "HWndDC.h"
#include <mlang.h>
#include <objidl.h>
#include <unicode/uchar.h>
#include <unicode/unorm.h>
#include <wtf/MathExtras.h>
namespace WebCore {
void SimpleFontData::platformInit()
{
if (!m_platformData.size()) {
m_fontMetrics.reset();
m_avgCharWidth = 0;
m_maxCharWidth = 0;
return;
}
HWndDC dc(0);
HGDIOBJ oldFont = SelectObject(dc, m_platformData.hfont());
TEXTMETRIC textMetric = {0};
if (!GetTextMetrics(dc, &textMetric)) {
if (FontPlatformData::ensureFontLoaded(m_platformData.hfont())) {
// Retry GetTextMetrics.
// FIXME: Handle gracefully the error if this call also fails.
// See http://crbug.com/6401.
if (!GetTextMetrics(dc, &textMetric))
LOG_ERROR("Unable to get the text metrics after second attempt");
}
}
m_avgCharWidth = textMetric.tmAveCharWidth;
m_maxCharWidth = textMetric.tmMaxCharWidth;
// FIXME: Access ascent/descent/lineGap with floating point precision.
float ascent = textMetric.tmAscent;
float descent = textMetric.tmDescent;
float lineGap = textMetric.tmExternalLeading;
float xHeight = ascent * 0.56f; // Best guess for xHeight for non-Truetype fonts.
OUTLINETEXTMETRIC outlineTextMetric;
if (GetOutlineTextMetrics(dc, sizeof(outlineTextMetric), &outlineTextMetric) > 0) {
m_fontMetrics.setUnitsPerEm(outlineTextMetric.otmEMSquare);
// This is a TrueType font. We might be able to get an accurate xHeight.
GLYPHMETRICS glyphMetrics = {0};
MAT2 identityMatrix = {{0, 1}, {0, 0}, {0, 0}, {0, 1}};
DWORD len = GetGlyphOutlineW(dc, 'x', GGO_METRICS, &glyphMetrics, 0, 0, &identityMatrix);
if (len != GDI_ERROR && glyphMetrics.gmBlackBoxY > 0)
xHeight = static_cast<float>(glyphMetrics.gmBlackBoxY);
}
m_fontMetrics.setAscent(ascent);
m_fontMetrics.setDescent(descent);
m_fontMetrics.setLineGap(lineGap);
m_fontMetrics.setXHeight(xHeight);
m_fontMetrics.setLineSpacing(ascent + descent + lineGap);
SelectObject(dc, oldFont);
}
void SimpleFontData::platformCharWidthInit()
{
// charwidths are set in platformInit.
}
void SimpleFontData::platformDestroy()
{
}
PassRefPtr<SimpleFontData> SimpleFontData::createScaledFontData(const FontDescription& fontDescription, float scaleFactor) const
{
LOGFONT winFont;
GetObject(m_platformData.hfont(), sizeof(LOGFONT), &winFont);
float scaledSize = scaleFactor * fontDescription.computedSize();
winFont.lfHeight = -lroundf(scaledSize);
HFONT hfont = CreateFontIndirect(&winFont);
return SimpleFontData::create(FontPlatformData(hfont, scaledSize, m_platformData.orientation()), isCustomFont(), false);
}
bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
{
// This used to be implemented with IMLangFontLink2, but since that code has
// been disabled, this would always return false anyway.
return false;
}
void SimpleFontData::determinePitch()
{
// TEXTMETRICS have this. Set m_treatAsFixedPitch based off that.
HWndDC dc(0);
HGDIOBJ oldFont = 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 textMetric = {0};
if (!GetTextMetrics(dc, &textMetric)) {
if (FontPlatformData::ensureFontLoaded(m_platformData.hfont())) {
// Retry GetTextMetrics.
// FIXME: Handle gracefully the error if this call also fails.
// See http://crbug.com/6401.
if (!GetTextMetrics(dc, &textMetric))
LOG_ERROR("Unable to get the text metrics after second attempt");
}
}
m_treatAsFixedPitch = ((textMetric.tmPitchAndFamily & TMPF_FIXED_PITCH) == 0);
SelectObject(dc, oldFont);
}
FloatRect SimpleFontData::platformBoundsForGlyph(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 };
if (GetGlyphOutline(hdc, glyph, GGO_METRICS | GGO_GLYPH_INDEX, &gdiMetrics, 0, 0, &identity) == -1) {
if (FontPlatformData::ensureFontLoaded(m_platformData.hfont())) {
// Retry GetTextMetrics.
// FIXME: Handle gracefully the error if this call also fails.
// See http://crbug.com/6401.
if (GetGlyphOutline(hdc, glyph, GGO_METRICS | GGO_GLYPH_INDEX, &gdiMetrics, 0, 0, &identity) == -1)
LOG_ERROR("Unable to get the glyph metrics after second attempt");
}
}
SelectObject(hdc, oldFont);
return FloatRect(gdiMetrics.gmptGlyphOrigin.x, -gdiMetrics.gmptGlyphOrigin.y,
gdiMetrics.gmBlackBoxX, gdiMetrics.gmBlackBoxY);
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
if (!m_platformData.size())
return 0;
HWndDC dc(0);
HGDIOBJ oldFont = SelectObject(dc, m_platformData.hfont());
int width = 0;
if (!GetCharWidthI(dc, glyph, 1, 0, &width)) {
// Ask the browser to preload the font and retry.
if (FontPlatformData::ensureFontLoaded(m_platformData.hfont())) {
// FIXME: Handle gracefully the error if this call also fails.
// See http://crbug.com/6401.
if (!GetCharWidthI(dc, glyph, 1, 0, &width))
LOG_ERROR("Unable to get the char width after second attempt");
}
}
SelectObject(dc, oldFont);
return static_cast<float>(width);
}
} // namespace WebCore
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