SimpleFontData* FontCache::getLastResortFallbackFont(const FontDescription& description, ShouldRetain shouldRetain)
{
FontDescription::GenericFamilyType generic = description.genericFamily();
// FIXME: Would be even better to somehow get the user's default font here.
// For now we'll pick the default that the user would get without changing
// any prefs.
static AtomicString timesStr("Times New Roman");
static AtomicString courierStr("Courier New");
static AtomicString arialStr("Arial");
AtomicString& fontStr = timesStr;
if (generic == FontDescription::SansSerifFamily)
fontStr = arialStr;
else if (generic == FontDescription::MonospaceFamily)
fontStr = courierStr;
SimpleFontData* simpleFont = getCachedFontData(description, fontStr, false, shouldRetain);
if (simpleFont)
return simpleFont;
// Fall back to system fonts as Win Safari does because this function must
// return a valid font. Once we find a valid system font, we save its name
// to a static variable and use it to prevent trying system fonts again.
static wchar_t fallbackFontName[LF_FACESIZE] = {0};
if (fallbackFontName[0])
return getCachedFontData(description, fallbackFontName, false, shouldRetain);
// Fall back to the DEFAULT_GUI_FONT if no known Unicode fonts are available.
if (HFONT defaultGUIFont = static_cast<HFONT>(GetStockObject(DEFAULT_GUI_FONT))) {
LOGFONT defaultGUILogFont;
GetObject(defaultGUIFont, sizeof(defaultGUILogFont), &defaultGUILogFont);
if (simpleFont = fontDataFromDescriptionAndLogFont(description, shouldRetain, defaultGUILogFont, fallbackFontName))
return simpleFont;
}
// Fall back to Non-client metrics fonts.
NONCLIENTMETRICS nonClientMetrics = {0};
nonClientMetrics.cbSize = sizeof(nonClientMetrics);
if (SystemParametersInfo(SPI_GETNONCLIENTMETRICS, sizeof(nonClientMetrics), &nonClientMetrics, 0)) {
if (simpleFont = fontDataFromDescriptionAndLogFont(description, shouldRetain, nonClientMetrics.lfMessageFont, fallbackFontName))
return simpleFont;
if (simpleFont = fontDataFromDescriptionAndLogFont(description, shouldRetain, nonClientMetrics.lfMenuFont, fallbackFontName))
return simpleFont;
if (simpleFont = fontDataFromDescriptionAndLogFont(description, shouldRetain, nonClientMetrics.lfStatusFont, fallbackFontName))
return simpleFont;
if (simpleFont = fontDataFromDescriptionAndLogFont(description, shouldRetain, nonClientMetrics.lfCaptionFont, fallbackFontName))
return simpleFont;
if (simpleFont = fontDataFromDescriptionAndLogFont(description, shouldRetain, nonClientMetrics.lfSmCaptionFont, fallbackFontName))
return simpleFont;
}
// Fall back to all the fonts installed in this PC. When a font has a
// localized name according to the system locale as well as an English name,
// both GetTextFace() and EnumFontFamilies() return the localized name. So,
// FontCache::createFontPlatformData() does not filter out the fonts
// returned by this EnumFontFamilies() call.
HDC dc = GetDC(0);
if (dc) {
GetLastResortFallbackFontProcData procData(this, &description, shouldRetain, fallbackFontName);
EnumFontFamilies(dc, 0, getLastResortFallbackFontProc, reinterpret_cast<LPARAM>(&procData));
ReleaseDC(0, dc);
if (procData.m_fontData)
return procData.m_fontData;
}
ASSERT_NOT_REACHED();
return 0;
}
static int CALLBACK getLastResortFallbackFontProc(const LOGFONT* logFont, const TEXTMETRIC* metrics, DWORD fontType, LPARAM lParam)
{
GetLastResortFallbackFontProcData* procData = reinterpret_cast<GetLastResortFallbackFontProcData*>(lParam);
procData->m_fontData = fontDataFromDescriptionAndLogFont(procData->m_fontCache, *procData->m_fontDescription, *logFont, procData->m_fontName);
return !procData->m_fontData;
}
