SimpleFontDataWin.cpp [plain text]
#include "config.h"
#include "SimpleFontData.h"
#include "Font.h"
#include "FontCache.h"
#include "FloatRect.h"
#include "FontDescription.h"
#include <mlang.h>
#include <unicode/uchar.h>
#include <unicode/unorm.h>
#include <winsock2.h>
#include <wtf/MathExtras.h>
#if USE(CG)
#include <ApplicationServices/ApplicationServices.h>
#include <WebKitSystemInterface/WebKitSystemInterface.h>
#endif
namespace WebCore {
using std::max;
const float cSmallCapsFontSizeMultiplier = 0.7f;
static bool g_shouldApplyMacAscentHack;
void SimpleFontData::setShouldApplyMacAscentHack(bool b)
{
g_shouldApplyMacAscentHack = b;
}
bool SimpleFontData::shouldApplyMacAscentHack()
{
return g_shouldApplyMacAscentHack;
}
void SimpleFontData::initGDIFont()
{
if (!m_platformData.size()) {
m_fontMetrics.reset();
m_avgCharWidth = 0;
m_maxCharWidth = 0;
return;
}
HDC hdc = GetDC(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;
MAT2 mat = { 1, 0, 0, 1 };
DWORD len = GetGlyphOutline(hdc, 'x', GGO_METRICS, &gm, 0, 0, &mat);
if (len != GDI_ERROR && gm.gmptGlyphOrigin.y > 0)
xHeight = gm.gmptGlyphOrigin.y;
m_fontMetrics.setXHeight(xHeight);
m_fontMetrics.setUnitsPerEm(metrics.otmEMSquare);
SelectObject(hdc, oldFont);
ReleaseDC(0, hdc);
return;
}
void SimpleFontData::platformDestroy()
{
ScriptFreeCache(&m_scriptCache);
delete m_scriptFontProperties;
}
PassOwnPtr<SimpleFontData> SimpleFontData::createScaledFontData(const FontDescription& fontDescription, float scaleFactor) const
{
float scaledSize = scaleFactor * m_platformData.size();
if (isCustomFont()) {
FontPlatformData scaledFont(m_platformData);
scaledFont.setSize(scaledSize);
return adoptPtr(new SimpleFontData(scaledFont, true, false));
}
LOGFONT winfont;
GetObject(m_platformData.hfont(), sizeof(LOGFONT), &winfont);
winfont.lfHeight = -lroundf(scaledSize * (m_platformData.useGDI() ? 1 : 32));
HFONT hfont = CreateFontIndirect(&winfont);
return adoptPtr(new SimpleFontData(FontPlatformData(hfont, scaledSize, m_platformData.syntheticBold(), m_platformData.syntheticOblique(), m_platformData.useGDI()), 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, cSmallCapsFontSizeMultiplier);
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
{
if (isCustomFont())
return false;
IMLangFontLink2* langFontLink = fontCache()->getFontLinkInterface();
if (!langFontLink)
return false;
HDC dc = GetDC(0);
DWORD acpCodePages;
langFontLink->CodePageToCodePages(CP_ACP, &acpCodePages);
DWORD fontCodePages;
langFontLink->GetFontCodePages(dc, m_platformData.hfont(), &fontCodePages);
DWORD actualCodePages;
long numCharactersProcessed;
long offset = 0;
while (offset < length) {
langFontLink->GetStrCodePages(characters, length, acpCodePages, &actualCodePages, &numCharactersProcessed);
if ((actualCodePages & fontCodePages) == 0)
return false;
offset += numCharactersProcessed;
}
ReleaseDC(0, dc);
return true;
}
void SimpleFontData::determinePitch()
{
if (isCustomFont()) {
m_treatAsFixedPitch = false;
return;
}
HDC dc = GetDC(0);
SaveDC(dc);
SelectObject(dc, m_platformData.hfont());
TEXTMETRIC tm;
GetTextMetrics(dc, &tm);
m_treatAsFixedPitch = ((tm.tmPitchAndFamily & TMPF_FIXED_PITCH) == 0);
RestoreDC(dc, -1);
ReleaseDC(0, dc);
}
FloatRect SimpleFontData::boundsForGDIGlyph(Glyph glyph) const
{
HDC hdc = GetDC(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);
ReleaseDC(0, hdc);
return FloatRect(gdiMetrics.gmptGlyphOrigin.x, -gdiMetrics.gmptGlyphOrigin.y,
gdiMetrics.gmBlackBoxX + m_syntheticBoldOffset, gdiMetrics.gmBlackBoxY);
}
float SimpleFontData::widthForGDIGlyph(Glyph glyph) const
{
HDC hdc = GetDC(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);
ReleaseDC(0, hdc);
return gdiMetrics.gmCellIncX + m_syntheticBoldOffset;
}
SCRIPT_FONTPROPERTIES* SimpleFontData::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) {
HDC dc = GetDC(0);
SaveDC(dc);
SelectObject(dc, m_platformData.hfont());
ScriptGetFontProperties(dc, scriptCache(), m_scriptFontProperties);
RestoreDC(dc, -1);
ReleaseDC(0, dc);
}
}
return m_scriptFontProperties;
}
}