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Avoid conversion over RGBA64 for RGB32 LCD text blending

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Short-cuts the case where there is no gamma correction to avoid a
conversion over RGBA64 and back.

Change-Id: I100697a9f7a4b94283557b2c0eaa45e0eff81785
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
This commit is contained in:
Allan Sandfeld Jensen 2018-08-28 12:45:20 +02:00
parent 7f0cc35d9c
commit 244c7bd193
1 changed files with 49 additions and 9 deletions
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58
src/gui/painting/qdrawhelper.cpp
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@ -5801,6 +5801,46 @@ static inline int qRgbAvg(QRgb rgb)
return (qRed(rgb) * 5 + qGreen(rgb) * 6 + qBlue(rgb) * 5) / 16;
}
static inline QRgb rgbBlend(QRgb d, QRgb s, uint rgbAlpha)
{
#if defined(__SSE2__)
__m128i vd = _mm_cvtsi32_si128(d);
__m128i vs = _mm_cvtsi32_si128(s);
__m128i va = _mm_cvtsi32_si128(rgbAlpha);
const __m128i vz = _mm_setzero_si128();
vd = _mm_unpacklo_epi8(vd, vz);
vs = _mm_unpacklo_epi8(vs, vz);
va = _mm_unpacklo_epi8(va, vz);
__m128i vb = _mm_xor_si128(_mm_set1_epi16(255), va);
vs = _mm_mullo_epi16(vs, va);
vd = _mm_mullo_epi16(vd, vb);
vd = _mm_add_epi16(vd, vs);
vd = _mm_add_epi16(vd, _mm_srli_epi16(vd, 8));
vd = _mm_add_epi16(vd, _mm_set1_epi16(0x80));
vd = _mm_srli_epi16(vd, 8);
vd = _mm_packus_epi16(vd, vd);
return _mm_cvtsi128_si32(vd);
#else
const int dr = qRed(d);
const int dg = qGreen(d);
const int db = qBlue(d);
const int sr = qRed(s);
const int sg = qGreen(s);
const int sb = qBlue(s);
const int mr = qRed(rgbAlpha);
const int mg = qGreen(rgbAlpha);
const int mb = qBlue(rgbAlpha);
const int nr = qt_div_255(sr * mr + dr * (255 - mr));
const int ng = qt_div_255(sg * mg + dg * (255 - mg));
const int nb = qt_div_255(sb * mb + db * (255 - mb));
return 0xff000000 | (nr << 16) | (ng << 8) | nb;
#endif
}
static inline void alphargbblend_generic(uint coverage, QRgba64 *dest, int x, const QRgba64 &srcLinear, const QRgba64 &src, const QColorProfile *colorProfile)
{
if (coverage == 0xff000000) {
@ -5823,20 +5863,20 @@ static inline void alphargbblend_generic(uint coverage, QRgba64 *dest, int x, co
}
}
static inline void alphargbblend_argb32(quint32 *dst, uint coverage, QRgba64 srcLinear, quint32 src, const QColorProfile *colorProfile)
static inline void alphargbblend_argb32(quint32 *dst, uint coverage, const QRgba64 &srcLinear, quint32 src, const QColorProfile *colorProfile)
{
if (coverage == 0xff000000) {
// nothing
} else if (coverage == 0xffffffff) {
*dst = src;
} else {
if (*dst >= 0xff000000) {
rgbBlendPixel(dst, coverage, srcLinear, colorProfile);
} else {
// Give up and do a naive gray alphablend. Needed to deal with ARGB32 and invalid ARGB32_premultiplied, see QTBUG-60571
const int a = qRgbAvg(coverage);
*dst = INTERPOLATE_PIXEL_255(src, a, *dst, 255 - a);
}
} else if (*dst < 0xff000000) {
// Give up and do a naive gray alphablend. Needed to deal with ARGB32 and invalid ARGB32_premultiplied, see QTBUG-60571
const int a = qRgbAvg(coverage);
*dst = INTERPOLATE_PIXEL_255(src, a, *dst, 255 - a);
} else if (!colorProfile) {
*dst = rgbBlend(*dst, src, coverage);
} else {
rgbBlendPixel(dst, coverage, srcLinear, colorProfile);
}
}