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Make distance fields rendering work with Opentype CFF fonts

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If the font has a CFF table, GDI will not label it as
TMPF_TRUETYPE, however, we can still use GetFontData to get
the SFNT tables. This is required to get the maxp table which
contains the glyph count, which is required to use the font
with the distance-field renderer.

Task-number: QTBUG-28746
Change-Id: I3ca1e3d96ea53c453e6fa422b33d1f1f5050a82c
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
This commit is contained in:
Eskil Abrahamsen Blomfeldt 2012-12-21 15:23:28 +01:00 committed by The Qt Project
parent b8623461d1
commit dde09c429a
2 changed files with 14 additions and 1 deletions
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13
src/plugins/platforms/windows/qwindowsfontengine.cpp
View File

@ -155,9 +155,20 @@ static OUTLINETEXTMETRIC *getOutlineTextMetric(HDC hdc)
return otm;
}
bool QWindowsFontEngine::hasCFFTable() const
{
HDC hdc = m_fontEngineData->hdc;
SelectObject(hdc, hfont);
return GetFontData(hdc, MAKE_TAG('C', 'F', 'F', ' '), 0, 0, 0) != GDI_ERROR;
}
void QWindowsFontEngine::getCMap()
{
ttf = (bool)(tm.tmPitchAndFamily & TMPF_TRUETYPE);
// TMPF_TRUETYPE is not set for fonts with CFF tables
cffTable = !ttf && hasCFFTable();
HDC hdc = m_fontEngineData->hdc;
SelectObject(hdc, hfont);
bool symb = false;
@ -1041,7 +1052,7 @@ void QWindowsFontEngine::getUnscaledGlyph(glyph_t glyph, QPainterPath *path, gly
bool QWindowsFontEngine::getSfntTableData(uint tag, uchar *buffer, uint *length) const
{
if (!ttf)
if (!ttf && !cffTable)
return false;
HDC hdc = m_fontEngineData->hdc;
SelectObject(hdc, hfont);

2
src/plugins/platforms/windows/qwindowsfontengine.h
View File

@ -145,6 +145,7 @@ public:
private:
QWindowsNativeImage *drawGDIGlyph(HFONT font, glyph_t, int margin, const QTransform &xform,
QImage::Format mask_format);
bool hasCFFTable() const;
const QSharedPointer<QWindowsFontEngineData> m_fontEngineData;
@ -155,6 +156,7 @@ private:
uint stockFont : 1;
uint ttf : 1;
uint hasOutline : 1;
uint cffTable : 1;
TEXTMETRIC tm;
int lw;
const unsigned char *cmap;