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[QFontEngineFT::loadGlyph] Consolidate paths for fetchMetricsOnly cases

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Use GlyphInfo as a temporary buffer for storing the glyph metrics
and go through the same code for fetchMetricsOnly and !fetchMetricsOnly.

Change-Id: If8bb85056e5f09588cc3956b43dc51a54d5aecfe
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
This commit is contained in:
Konstantin Ritt 2015-04-01 10:56:39 +04:00
parent 550fb85b65
commit 237cb0d082
2 changed files with 27 additions and 25 deletions
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51
src/gui/text/qfontengine_ft.cpp
View File

@ -801,6 +801,17 @@ int QFontEngineFT::loadFlags(QGlyphSet *set, GlyphFormat format, int flags,
return load_flags;
}
static inline bool areMetricsTooLarge(const QFontEngineFT::GlyphInfo &info)
{
// false if exceeds QFontEngineFT::Glyph metrics
return (short)(info.linearAdvance) == info.linearAdvance
&& (signed char)(info.xOff) == info.xOff
&& (uchar)(info.width) == info.width
&& (uchar)(info.height) == info.height
&& (signed char)(info.x) == info.x
&& (signed char)(info.y) == info.y;
}
QFontEngineFT::Glyph *QFontEngineFT::loadGlyph(QGlyphSet *set, uint glyph,
QFixed subPixelPosition,
GlyphFormat format,
@ -885,6 +896,7 @@ QFontEngineFT::Glyph *QFontEngineFT::loadGlyph(QGlyphSet *set, uint glyph,
}
GlyphInfo info;
info.linearAdvance = slot->linearHoriAdvance >> 10;
info.xOff = TRUNC(ROUND(slot->advance.x));
info.yOff = 0;
@ -893,27 +905,23 @@ QFontEngineFT::Glyph *QFontEngineFT::loadGlyph(QGlyphSet *set, uint glyph,
int right = CEIL(slot->metrics.horiBearingX + slot->metrics.width);
int top = CEIL(slot->metrics.horiBearingY);
int bottom = FLOOR(slot->metrics.horiBearingY - slot->metrics.height);
int width = right-left;
int height = top-bottom;
info.x = TRUNC(left);
info.y = TRUNC(top);
info.width = TRUNC(right - left);
info.height = TRUNC(top - bottom);
// If any of the metrics are too large to fit, don't cache them
if (qAbs(info.xOff) >= 128
|| qAbs(TRUNC(top)) >= 128
|| TRUNC(width) >= 256
|| TRUNC(height) >= 256
|| qAbs(TRUNC(left)) >= 128
|| qAbs(TRUNC(ROUND(slot->advance.x))) >= 128) {
if (areMetricsTooLarge(info))
return 0;
}
g = new Glyph;
g->data = 0;
g->linearAdvance = slot->linearHoriAdvance >> 10;
g->width = TRUNC(width);
g->height = TRUNC(height);
g->x = TRUNC(left);
g->y = TRUNC(top);
g->advance = TRUNC(ROUND(slot->advance.x));
g->linearAdvance = info.linearAdvance;
g->width = info.width;
g->height = info.height;
g->x = info.x;
g->y = info.y;
g->advance = info.xOff;
g->format = format;
if (set)
@ -1014,16 +1022,9 @@ QFontEngineFT::Glyph *QFontEngineFT::loadGlyph(QGlyphSet *set, uint glyph,
info.x -= 1;
}
bool large_glyph = (((short)(slot->linearHoriAdvance>>10) != slot->linearHoriAdvance>>10)
|| ((uchar)(info.width) != info.width)
|| ((uchar)(info.height) != info.height)
|| ((signed char)(info.x) != info.x)
|| ((signed char)(info.y) != info.y)
|| ((signed char)(info.xOff) != info.xOff));
if (large_glyph) {
// If any of the metrics are too large to fit, don't cache them
if (areMetricsTooLarge(info))
return 0;
}
int pitch = (format == Format_Mono ? ((info.width + 31) & ~31) >> 3 :
(format == Format_A8 ? (info.width + 3) & ~3 : info.width * 4));
@ -1136,7 +1137,7 @@ QFontEngineFT::Glyph *QFontEngineFT::loadGlyph(QGlyphSet *set, uint glyph,
g->data = 0;
}
g->linearAdvance = slot->linearHoriAdvance >> 10;
g->linearAdvance = info.linearAdvance;
g->width = info.width;
g->height = info.height;
g->x = info.x;

1
src/gui/text/qfontengine_ft_p.h
View File

@ -143,6 +143,7 @@ public:
};
struct GlyphInfo {
int linearAdvance;
unsigned short width;
unsigned short height;
short x;