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Optimized LCD text blending

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Make a QRGba64 helper function for LCD blending following our standard
form.

Change-Id: Ib29cf8e780a042ed46554c55c67a698a0e3eddcd
Reviewed-by: Erik Verbruggen <erik.verbruggen@qt.io>
This commit is contained in:
Allan Sandfeld Jensen 2016-11-22 16:41:15 +01:00
parent 5d35eea3e1
commit d133bbf02a
2 changed files with 47 additions and 9 deletions
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10
src/gui/painting/qdrawhelper.cpp
View File

@ -5512,17 +5512,9 @@ static void qt_alphamapblit_quint16(QRasterBuffer *rasterBuffer,
static inline void rgbBlendPixel(quint32 *dst, int coverage, QRgba64 slinear, const QColorProfile *colorProfile)
{
// Do a gammacorrected RGB alphablend...
const int mr = qRed(coverage);
const int mg = qGreen(coverage);
const int mb = qBlue(coverage);
const QRgba64 dlinear = colorProfile->toLinear64(*dst);
QRgba64 blend;
blend.setAlpha(65535);
blend.setRed (qt_div_255(slinear.red() * mr + dlinear.red() * (255 - mr)));
blend.setGreen(qt_div_255(slinear.green() * mg + dlinear.green() * (255 - mg)));
blend.setBlue (qt_div_255(slinear.blue() * mb + dlinear.blue() * (255 - mb)));
QRgba64 blend = rgbBlend(dlinear, slinear, coverage);
*dst = colorProfile->fromLinear64(blend);
}

46
src/gui/painting/qrgba64_p.h
View File

@ -248,6 +248,52 @@ Q_ALWAYS_INLINE uint16x4_t addWithSaturation(uint16x4_t a, uint16x4_t b)
}
#endif
inline QRgba64 rgbBlend(QRgba64 d, QRgba64 s, uint rgbAlpha)
{
QRgba64 blend;
#ifdef __SSE2__
__m128i vd = _mm_loadl_epi64((const __m128i *)&d);
__m128i vs = _mm_loadl_epi64((const __m128i *)&s);
__m128i va = _mm_cvtsi32_si128(rgbAlpha);
va = _mm_unpacklo_epi8(va, va);
__m128i vb = _mm_xor_si128(_mm_set1_epi16(-1), va);
vs = _mm_unpacklo_epi16(_mm_mullo_epi16(vs, va), _mm_mulhi_epu16(vs, va));
vd = _mm_unpacklo_epi16(_mm_mullo_epi16(vd, vb), _mm_mulhi_epu16(vd, vb));
vd = _mm_add_epi32(vd, vs);
vd = _mm_add_epi32(vd, _mm_srli_epi32(vd, 16));
vd = _mm_add_epi32(vd, _mm_set1_epi32(0x8000));
vd = _mm_srai_epi32(vd, 16);
vd = _mm_packs_epi32(vd, _mm_setzero_si128());
_mm_storel_epi64((__m128i *)&blend, vd);
#elif defined(__ARM_NEON__)
uint16x4_t vd = vreinterpret_u16_u64(vmov_n_u64(d));
uint16x4_t vs = vreinterpret_u16_u64(vmov_n_u64(s));
uint8x8_t va8 = vreinterpret_u8_u32(vmov_n_u32(rgbAlpha));
uint16x4_t va = vreinterpret_u16_u8(vzip_u8(va8, va8).val[0]);
uint16x4_t vb = vdup_n_u16(0xffff);
vb = vsub_u16(vb, va);
uint32x4_t vs32 = vmull_u16(vs, va);
uint32x4_t vd32 = vmull_u16(vd, vb);
vd32 = vaddq_u32(vd32, vs32);
vd32 = vsraq_n_u32(vd32, vd32, 16);
vd = vrshrn_n_u32(vd32, 16);
vst1_u64(reinterpret_cast<uint64_t *>(&blend), vreinterpret_u64_u16(vd));
#else
const int mr = qRed(rgbAlpha);
const int mg = qGreen(rgbAlpha);
const int mb = qBlue(rgbAlpha);
blend.setRed (qt_div_255(s.red() * mr + d.red() * (255 - mr)));
blend.setGreen(qt_div_255(s.green() * mg + d.green() * (255 - mg)));
blend.setBlue (qt_div_255(s.blue() * mb + d.blue() * (255 - mb)));
blend.setAlpha(s.alpha());
#endif
return blend;
}
QT_END_NAMESPACE
#endif // QRGBA64_P_H