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make use of cached alpha color table in QFontEngine::alphaMapForGlyph() and QFontEngineBox::alphaMapForGlyph()

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Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
This commit is contained in:
Ivailo Monev 2021-08-28 23:00:27 +03:00
parent a28897786a
commit 2a5450f8b4
1 changed files with 3 additions and 8 deletions
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11
src/gui/text/qfontengine.cpp
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@ -31,6 +31,7 @@
#include "qharfbuzz_p.h"
#include "qdrawhelper_p.h"
#include "qcorecommon_p.h"
#include "qguicommon_p.h"
QT_BEGIN_NAMESPACE
@ -632,10 +633,7 @@ QImage QFontEngine::alphaMapForGlyph(glyph_t glyph)
p.end();
QImage indexed(im.width(), im.height(), QImage::Format_Indexed8);
QVector<QRgb> colors(256);
for (int i=0; i<256; ++i)
colors[i] = qRgba(0, 0, 0, i);
indexed.setColorTable(colors);
indexed.setColorTable(alphaColorTable());
const int bpl = indexed.bytesPerLine();
uchar *dest = indexed.bits();
@ -1210,10 +1208,7 @@ QFontEngine::Type QFontEngineBox::type() const
QImage QFontEngineBox::alphaMapForGlyph(glyph_t)
{
QImage image(_size, _size, QImage::Format_Indexed8);
QVector<QRgb> colors(256);
for (int i=0; i<256; ++i)
colors[i] = qRgba(0, 0, 0, i);
image.setColorTable(colors);
image.setColorTable(alphaColorTable());
image.fill(0);
// can't use qpainter for index8; so use setPixel to draw our rectangle.