SimpleFontDataChromiumWin.cpp [plain text]
#include "config.h"
#include "SimpleFontData.h"
#include "FloatRect.h"
#include "Font.h"
#include "FontCache.h"
#include "FontDescription.h"
#include "PlatformBridge.h"
#include <wtf/MathExtras.h>
#include <unicode/uchar.h>
#include <unicode/unorm.h>
#include <objidl.h>
#include <mlang.h>
namespace WebCore {
static inline float scaleEmToUnits(float x, int unitsPerEm)
{
return unitsPerEm ? x / static_cast<float>(unitsPerEm) : x;
}
void SimpleFontData::platformInit()
{
if (!m_platformData.size()) {
m_fontMetrics.reset();
m_avgCharWidth = 0;
m_maxCharWidth = 0;
return;
}
HDC dc = GetDC(0);
HGDIOBJ oldFont = SelectObject(dc, m_platformData.hfont());
TEXTMETRIC textMetric = {0};
if (!GetTextMetrics(dc, &textMetric)) {
if (PlatformBridge::ensureFontLoaded(m_platformData.hfont())) {
if (!GetTextMetrics(dc, &textMetric))
LOG_ERROR("Unable to get the text metrics after second attempt");
}
}
m_avgCharWidth = textMetric.tmAveCharWidth;
m_maxCharWidth = textMetric.tmMaxCharWidth;
float ascent = textMetric.tmAscent;
float descent = textMetric.tmDescent;
float lineGap = textMetric.tmExternalLeading;
float xHeight = ascent * 0.56f;
OUTLINETEXTMETRIC outlineTextMetric;
if (GetOutlineTextMetrics(dc, sizeof(outlineTextMetric), &outlineTextMetric) > 0) {
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);
ReleaseDC(0, dc);
}
void SimpleFontData::platformCharWidthInit()
{
}
void SimpleFontData::platformDestroy()
{
}
PassOwnPtr<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 adoptPtr(new SimpleFontData(FontPlatformData(hfont, scaledSize), isCustomFont(), false));
}
SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
{
if (!m_derivedFontData)
m_derivedFontData = DerivedFontData::create(isCustomFont());
if (!m_derivedFontData->smallCaps)
m_derivedFontData->smallCaps = createScaledFontData(fontDescription, .7);
return m_derivedFontData->smallCaps.get();
}
SimpleFontData* SimpleFontData::emphasisMarkFontData(const FontDescription& fontDescription) const
{
if (!m_derivedFontData)
m_derivedFontData = DerivedFontData::create(isCustomFont());
if (!m_derivedFontData->emphasisMark)
m_derivedFontData->emphasisMark = createScaledFontData(fontDescription, .5);
return m_derivedFontData->emphasisMark.get();
}
bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
{
return false;
}
void SimpleFontData::determinePitch()
{
HDC dc = GetDC(0);
HGDIOBJ oldFont = SelectObject(dc, m_platformData.hfont());
TEXTMETRIC textMetric = {0};
if (!GetTextMetrics(dc, &textMetric)) {
if (PlatformBridge::ensureFontLoaded(m_platformData.hfont())) {
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);
ReleaseDC(0, dc);
}
FloatRect SimpleFontData::platformBoundsForGlyph(Glyph) const
{
return FloatRect();
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
if (!m_platformData.size())
return 0;
HDC dc = GetDC(0);
HGDIOBJ oldFont = SelectObject(dc, m_platformData.hfont());
int width = 0;
if (!GetCharWidthI(dc, glyph, 1, 0, &width)) {
if (PlatformBridge::ensureFontLoaded(m_platformData.hfont())) {
if (!GetCharWidthI(dc, glyph, 1, 0, &width))
LOG_ERROR("Unable to get the char width after second attempt");
}
}
SelectObject(dc, oldFont);
ReleaseDC(0, dc);
return static_cast<float>(width);
}
}