bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
{
if (m_platformData.isDisabled())
return true;
// FIXME: Microsoft documentation seems to imply that characters can be output using a given font and DC
// merely by testing code page intersection. This seems suspect though. Can't a font only partially
// cover a given code page?
// FIXME: in the case that we failed to get the interface, still use the font.
IMLangFontLinkType* langFontLink = fontCache()->getFontLinkInterface();
if (!langFontLink)
return true;
DWORD fontCodePages = m_platformData.codePages();
if (!fontCodePages)
return false;
DWORD acpCodePages = 0;
langFontLink->CodePageToCodePages(CP_ACP, &acpCodePages);
DWORD actualCodePages;
long numCharactersProcessed;
while (length) {
langFontLink->GetStrCodePages(characters, length, acpCodePages, &actualCodePages, &numCharactersProcessed);
if (actualCodePages && !(actualCodePages & fontCodePages))
return false;
length -= numCharactersProcessed;
characters += numCharactersProcessed;
}
return true;
}
static const Vector<DWORD, 4>& getCJKCodePageMasks()
{
// The default order in which we look for a font for a CJK character. If the user's default code page is
// one of these, we will use it first.
static const UINT CJKCodePages[] = {
932, /* Japanese */
936, /* Simplified Chinese */
950, /* Traditional Chinese */
949 /* Korean */
};
static Vector<DWORD, 4> codePageMasks;
static bool initialized;
if (!initialized) {
initialized = true;
IMLangFontLinkType* langFontLink = fontCache().getFontLinkInterface();
if (!langFontLink)
return codePageMasks;
UINT defaultCodePage;
DWORD defaultCodePageMask = 0;
if (GetLocaleInfo(LOCALE_USER_DEFAULT, LOCALE_RETURN_NUMBER | LOCALE_IDEFAULTANSICODEPAGE, reinterpret_cast<LPWSTR>(&defaultCodePage), sizeof(defaultCodePage)))
langFontLink->CodePageToCodePages(defaultCodePage, &defaultCodePageMask);
if (defaultCodePage == CJKCodePages[0] || defaultCodePage == CJKCodePages[1] || defaultCodePage == CJKCodePages[2] || defaultCodePage == CJKCodePages[3])
codePageMasks.append(defaultCodePageMask);
for (unsigned i = 0; i < 4; ++i) {
if (defaultCodePage != CJKCodePages[i]) {
DWORD codePageMask;
langFontLink->CodePageToCodePages(CJKCodePages[i], &codePageMask);
codePageMasks.append(codePageMask);
}
}
}
return codePageMasks;
}
