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QFontEngineFT: Optimize format convertion code with template magic

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Avoids in-loop check for every pixel by costs of slightly bigger code.

Change-Id: I8321d0945ac6b677786431670b2316c60e4db492
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
This commit is contained in:
Konstantin Ritt 2015-11-09 01:47:07 +04:00
parent 6a7155997b
commit 4d5b57825a
1 changed files with 38 additions and 16 deletions
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54
src/gui/text/qfontengine_ft.cpp
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@ -534,55 +534,77 @@ QFontEngineFT::Glyph::~Glyph()
delete [] data;
}
static inline uint filterPixel(uchar red, uchar green, uchar blue, bool legacyFilter)
struct LcdFilterDummy
{
if (legacyFilter) {
static inline void filterPixel(uchar &, uchar &, uchar &)
{}
};
struct LcdFilterLegacy
{
static inline void filterPixel(uchar &red, uchar &green, uchar &blue)
{
uint r = red, g = green, b = blue;
// intra-pixel filter used by the legacy filter (adopted from _ft_lcd_filter_legacy)
red = (r * uint(65538 * 9/13) + g * uint(65538 * 1/6) + b * uint(65538 * 1/13)) / 65536;
green = (r * uint(65538 * 3/13) + g * uint(65538 * 4/6) + b * uint(65538 * 3/13)) / 65536;
blue = (r * uint(65538 * 1/13) + g * uint(65538 * 1/6) + b * uint(65538 * 9/13)) / 65536;
}
};
// alpha = green
return (green << 24) + (red << 16) + (green << 8) + blue;
}
static void convertRGBToARGB(const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr, bool legacyFilter)
template <typename LcdFilter>
static void convertRGBToARGB_helper(const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr)
{
int h = height;
const int offs = bgr ? -1 : 1;
const int w = width * 3;
while (h--) {
while (height--) {
uint *dd = dst;
for (int x = 0; x < w; x += 3) {
uchar red = src[x + 1 - offs];
uchar green = src[x + 1];
uchar blue = src[x + 1 + offs];
*dd = filterPixel(red, green, blue, legacyFilter);
++dd;
LcdFilter::filterPixel(red, green, blue);
// alpha = green
*dd++ = (green << 24) | (red << 16) | (green << 8) | blue;
}
dst += width;
src += src_pitch;
}
}
static void convertRGBToARGB_V(const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr, bool legacyFilter)
static inline void convertRGBToARGB(const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr, bool legacyFilter)
{
if (!legacyFilter)
convertRGBToARGB_helper<LcdFilterDummy>(src, dst, width, height, src_pitch, bgr);
else
convertRGBToARGB_helper<LcdFilterLegacy>(src, dst, width, height, src_pitch, bgr);
}
template <typename LcdFilter>
static void convertRGBToARGB_V_helper(const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr)
{
int h = height;
const int offs = bgr ? -src_pitch : src_pitch;
while (h--) {
while (height--) {
for (int x = 0; x < width; x++) {
uchar red = src[x + src_pitch - offs];
uchar green = src[x + src_pitch];
uchar blue = src[x + src_pitch + offs];
dst[x] = filterPixel(red, green, blue, legacyFilter);
LcdFilter::filterPixel(red, green, blue);
// alpha = green
*dst++ = (green << 24) | (red << 16) | (green << 8) | blue;
}
dst += width;
src += 3*src_pitch;
}
}
static inline void convertRGBToARGB_V(const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr, bool legacyFilter)
{
if (!legacyFilter)
convertRGBToARGB_V_helper<LcdFilterDummy>(src, dst, width, height, src_pitch, bgr);
else
convertRGBToARGB_V_helper<LcdFilterLegacy>(src, dst, width, height, src_pitch, bgr);
}
static inline void convertGRAYToARGB(const uchar *src, uint *dst, int width, int height, int src_pitch)
{
while (height--) {