Details
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Suggestion
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Resolution: Invalid
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Not Evaluated
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None
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4.7.2
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None
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Wince6.0/iMx515
Description
according to last mailing list, anti-aliasing on wince/qt is unavailable.
but i found anti-aliasing enable method.
QFontEngineWin::alphaMapForGlyph(glyph_t glyph, const QTransform &xform) designed to RGB32
when wince use 16bpp problems occured
qGray function is for RGB32/24 not RGB565
this patch is make font 256 gray anti-aliasing
i don't know how make RGB mask for text
if U can make RGB mask, it will be able to subpixel font rendering too.
==============================================================================================================
wince_Antialiasing.diff
--- D:/Qt/qt-4.7.1-wince6L/src/gui/text/qfontengine_win.cpp.org 화 4 26 10:55:54 2011
+++ D:/Qt/qt-4.7.1-wince6L/src/gui/text/qfontengine_win.cpp 화 4 26 10:56:15 2011
@@ -1190,7 +1190,6 @@
return ni;
}
-
extern uint qt_pow_gamma[256];
QImage QFontEngineWin::alphaMapForGlyph(glyph_t glyph, const QTransform &xform)
@@ -1221,26 +1220,24 @@
// Copy data... Cannot use QPainter here as GDI has messed up the
// Alpha channel of the ni.image pixels...
- for (int y=0; y<mask->height(); ++y) {
- uchar *dest = indexed.scanLine(y);
- if (mask->image.format() == QImage::Format_RGB16) {
- const qint16 *src = (qint16 *) ((const QImage &) mask->image).scanLine(y);
- for (int x=0; x<mask->width(); ++x)
- dest[x] = 255 - qGray(src[x]);
- } else {
- const uint *src = (uint *) ((const QImage &) mask->image).scanLine(y);
- for (int x=0; x<mask->width(); ++x) {
+ const QImage source = mask->image.depth() == 32
+ ? mask->image
+ : mask->image.convertToFormat(QImage::Format_RGB32);
+
+ for (int y=0; y<source.height(); ++y) {
+ uchar *dest = indexed.scanLine(y);
+ const uint *src = (uint *) source.scanLine(y);
+ for (int x=0; x<source.width(); ++x) {
#ifdef Q_OS_WINCE
- dest[x] = 255 - qGray(src[x]);
+ dest[x] = 255 - qGray(src[x]);
#else
- if (QNativeImage::systemFormat() == QImage::Format_RGB16)
- dest[x] = 255 - qGray(src[x]);
- else
- dest[x] = 255 - (qt_pow_gamma[qGray(src[x])] * 255. / 2047.);
+ if (QNativeImage::systemFormat() == QImage::Format_RGB16)
+ dest[x] = 255 - qGray(src[x]);
+ else
+ dest[x] = 255 - (qt_pow_gamma[qGray(src[x])] * 255. / 2047.);
#endif
- }
- }
- }
+ }
+ }
// Cleanup...
delete mask;
@@ -1257,12 +1254,16 @@
QImage QFontEngineWin::alphaRGBMapForGlyph(glyph_t glyph, int margin, const QTransform &t)
{
HFONT font = hfont;
+ if (qt_cleartype_enabled) {
+ LOGFONT lf = logfont;
+ lf.lfQuality = ANTIALIASED_QUALITY;
+ font = CreateFontIndirect(&lf);
+ }
int contrast;
SystemParametersInfo(SPI_GETFONTSMOOTHINGCONTRAST, 0, &contrast, 0);
SystemParametersInfo(SPI_SETFONTSMOOTHINGCONTRAST, 0, (void *) 1000, 0);
-
- QNativeImage *mask = drawGDIGlyph(font, glyph, margin, t, QImage::Format_RGB32);
+ QNativeImage *mask = drawGDIGlyph(font, glyph, margin, t, QNativeImage::systemFormat());
SystemParametersInfo(SPI_SETFONTSMOOTHINGCONTRAST, 0, (void *) contrast, 0);
if (mask == 0)
@@ -1278,11 +1279,14 @@
uint *dest = (uint *) rgbMask.scanLine(y);
const uint *src = (uint *) source.scanLine(y);
for (int x=0; x<mask->width(); ++x) {
dest[x] = 0xffffffff - (0x00ffffff & src[x]);
}
}
delete mask;
+ if (qt_cleartype_enabled) {
+ DeleteObject(font);
+ }
return rgbMask;
}
