SimpleFontDataWin.cpp [plain text]
#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;
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;
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; 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()
{
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;
}
HWndDC dc(0);
SaveDC(dc);
SelectObject(dc, m_platformData.hfont());
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;
}
}