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| author | Allan Sandfeld Jensen <allan.jensen@theqtcompany.com> | 2015-04-22 19:22:26 +0000 |
|---|---|---|
| committer | Allan Sandfeld Jensen <allan.jensen@theqtcompany.com> | 2015-04-23 09:25:28 +0000 |
| commit | 63d5a42b59149bfdebc9a5a123e7115a813bcaa4 (patch) | |
| tree | 5a9118f4468e816c3efc2bdfeffaad17c649b03f /src/gui/painting/qdrawingprimitive_sse2_p.h | |
| parent | 6535912add3444544c9403e5ecb2b8910ec6e2f5 (diff) | |
Revert "Remove separate SSE4 unpremultiply function"
Could causedSSE4 instructions to be used on non SSE4 machines
in cases when qUnpremultiplywas not inlined.
This reverts commit 964ccc58534aac436529007000d1c38d76c88834.
Change-Id: Ic676ade8f75129e8d37c4d96cbfb2bdb5b794919
Task-number: QTBUG-45741
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Diffstat (limited to 'src/gui/painting/qdrawingprimitive_sse2_p.h')
| -rw-r--r-- | src/gui/painting/qdrawingprimitive_sse2_p.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/gui/painting/qdrawingprimitive_sse2_p.h b/src/gui/painting/qdrawingprimitive_sse2_p.h index fbee06e157..4d0790a502 100644 --- a/src/gui/painting/qdrawingprimitive_sse2_p.h +++ b/src/gui/painting/qdrawingprimitive_sse2_p.h @@ -236,4 +236,25 @@ QT_END_NAMESPACE #endif // __SSE2__ +QT_BEGIN_NAMESPACE +#if QT_COMPILER_SUPPORTS_HERE(SSE4_1) +QT_FUNCTION_TARGET(SSE4_1) +inline QRgb qUnpremultiply_sse4(QRgb p) +{ + const uint alpha = qAlpha(p); + const uint invAlpha = qt_inv_premul_factor[alpha]; + const __m128i via = _mm_set1_epi32(invAlpha); + const __m128i vr = _mm_set1_epi32(0x8000); + __m128i vl = _mm_cvtepu8_epi32(_mm_cvtsi32_si128(p)); + vl = _mm_mullo_epi32(vl, via); + vl = _mm_add_epi32(vl, vr); + vl = _mm_srai_epi32(vl, 16); + vl = _mm_insert_epi32(vl, alpha, 3); + vl = _mm_packus_epi32(vl, _mm_setzero_si128()); + vl = _mm_packus_epi16(vl, _mm_setzero_si128()); + return _mm_cvtsi128_si32(vl); +} +#endif +QT_END_NAMESPACE + #endif // QDRAWINGPRIMITIVE_SSE2_P_H |