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| |
| #ifndef QCOLORTRCLUT_P_H |
| #define QCOLORTRCLUT_P_H |
| |
| // |
| // W A R N I N G |
| // ------------- |
| // |
| // This file is not part of the Qt API. It exists purely as an |
| // implementation detail. This header file may change from version to |
| // version without notice, or even be removed. |
| // |
| // We mean it. |
| // |
| |
| #include <QtGui/private/qtguiglobal_p.h> |
| #include <QtCore/qsharedpointer.h> |
| #include <QtGui/qrgb.h> |
| #include <QtGui/qrgba64.h> |
| |
| #include <cmath> |
| |
| #if defined(__SSE2__) |
| #include <emmintrin.h> |
| #elif defined(__ARM_NEON__) || defined(__ARM_NEON) |
| #include <arm_neon.h> |
| #endif |
| |
| QT_BEGIN_NAMESPACE |
| |
| class QColorTransferFunction; |
| class QColorTransferTable; |
| |
| class Q_GUI_EXPORT QColorTrcLut : public QEnableSharedFromThis<QColorTrcLut> |
| { |
| public: |
| static QColorTrcLut *fromGamma(qreal gamma); |
| static QColorTrcLut *fromTransferFunction(const QColorTransferFunction &transfn); |
| static QColorTrcLut *fromTransferTable(const QColorTransferTable &transTable); |
| |
| // The following methods all convert opaque or unpremultiplied colors: |
| |
| QRgba64 toLinear64(QRgb rgb32) const |
| { |
| #if defined(__SSE2__) |
| __m128i v = _mm_cvtsi32_si128(rgb32); |
| v = _mm_unpacklo_epi8(v, _mm_setzero_si128()); |
| const __m128i vidx = _mm_slli_epi16(v, 4); |
| const int ridx = _mm_extract_epi16(vidx, 2); |
| const int gidx = _mm_extract_epi16(vidx, 1); |
| const int bidx = _mm_extract_epi16(vidx, 0); |
| v = _mm_slli_epi16(v, 8); // a * 256 |
| v = _mm_insert_epi16(v, m_toLinear[ridx], 0); |
| v = _mm_insert_epi16(v, m_toLinear[gidx], 1); |
| v = _mm_insert_epi16(v, m_toLinear[bidx], 2); |
| v = _mm_add_epi16(v, _mm_srli_epi16(v, 8)); |
| QRgba64 rgba64; |
| _mm_storel_epi64(reinterpret_cast<__m128i *>(&rgba64), v); |
| return rgba64; |
| #elif (defined(__ARM_NEON__) || defined(__ARM_NEON)) && Q_BYTE_ORDER == Q_LITTLE_ENDIAN |
| uint8x8_t v8 = vreinterpret_u8_u32(vmov_n_u32(rgb32)); |
| uint16x4_t v16 = vget_low_u16(vmovl_u8(v8)); |
| const uint16x4_t vidx = vshl_n_u16(v16, 4); |
| const int ridx = vget_lane_u16(vidx, 2); |
| const int gidx = vget_lane_u16(vidx, 1); |
| const int bidx = vget_lane_u16(vidx, 0); |
| v16 = vshl_n_u16(v16, 8); // a * 256 |
| v16 = vset_lane_u16(m_toLinear[ridx], v16, 0); |
| v16 = vset_lane_u16(m_toLinear[gidx], v16, 1); |
| v16 = vset_lane_u16(m_toLinear[bidx], v16, 2); |
| v16 = vadd_u16(v16, vshr_n_u16(v16, 8)); |
| return QRgba64::fromRgba64(vget_lane_u64(vreinterpret_u64_u16(v16), 0)); |
| #else |
| uint r = m_toLinear[qRed(rgb32) << 4]; |
| uint g = m_toLinear[qGreen(rgb32) << 4]; |
| uint b = m_toLinear[qBlue(rgb32) << 4]; |
| r = r + (r >> 8); |
| g = g + (g >> 8); |
| b = b + (b >> 8); |
| return QRgba64::fromRgba64(r, g, b, qAlpha(rgb32) * 257); |
| #endif |
| } |
| |
| QRgb toLinear(QRgb rgb32) const |
| { |
| return convertWithTable(rgb32, m_toLinear); |
| } |
| |
| QRgba64 toLinear(QRgba64 rgb64) const |
| { |
| return convertWithTable(rgb64, m_toLinear); |
| } |
| |
| float u8ToLinearF32(int c) const |
| { |
| ushort v = m_toLinear[c << 4]; |
| return v * (1.0f / (255*256)); |
| } |
| |
| float u16ToLinearF32(int c) const |
| { |
| c -= (c >> 8); |
| ushort v = m_toLinear[c >> 4]; |
| return v * (1.0f / (255*256)); |
| } |
| |
| float toLinear(float f) const |
| { |
| ushort v = m_toLinear[(int)(f * (255 * 16) + 0.5f)]; |
| return v * (1.0f / (255*256)); |
| } |
| |
| QRgb fromLinear64(QRgba64 rgb64) const |
| { |
| #if defined(__SSE2__) |
| __m128i v = _mm_loadl_epi64(reinterpret_cast<const __m128i *>(&rgb64)); |
| v = _mm_sub_epi16(v, _mm_srli_epi16(v, 8)); |
| const __m128i vidx = _mm_srli_epi16(v, 4); |
| const int ridx = _mm_extract_epi16(vidx, 0); |
| const int gidx = _mm_extract_epi16(vidx, 1); |
| const int bidx = _mm_extract_epi16(vidx, 2); |
| v = _mm_insert_epi16(v, m_fromLinear[ridx], 2); |
| v = _mm_insert_epi16(v, m_fromLinear[gidx], 1); |
| v = _mm_insert_epi16(v, m_fromLinear[bidx], 0); |
| v = _mm_add_epi16(v, _mm_set1_epi16(0x80)); |
| v = _mm_srli_epi16(v, 8); |
| v = _mm_packus_epi16(v, v); |
| return _mm_cvtsi128_si32(v); |
| #elif (defined(__ARM_NEON__) || defined(__ARM_NEON)) && Q_BYTE_ORDER == Q_LITTLE_ENDIAN |
| uint16x4_t v = vreinterpret_u16_u64(vmov_n_u64(rgb64)); |
| v = vsub_u16(v, vshr_n_u16(v, 8)); |
| const uint16x4_t vidx = vshr_n_u16(v, 4); |
| const int ridx = vget_lane_u16(vidx, 0); |
| const int gidx = vget_lane_u16(vidx, 1); |
| const int bidx = vget_lane_u16(vidx, 2); |
| v = vset_lane_u16(m_fromLinear[ridx], v, 2); |
| v = vset_lane_u16(m_fromLinear[gidx], v, 1); |
| v = vset_lane_u16(m_fromLinear[bidx], v, 0); |
| uint8x8_t v8 = vrshrn_n_u16(vcombine_u16(v, v), 8); |
| return vget_lane_u32(vreinterpret_u32_u8(v8), 0); |
| #else |
| uint a = rgb64.alpha(); |
| uint r = rgb64.red(); |
| uint g = rgb64.green(); |
| uint b = rgb64.blue(); |
| a = a - (a >> 8); |
| r = r - (r >> 8); |
| g = g - (g >> 8); |
| b = b - (b >> 8); |
| a = (a + 0x80) >> 8; |
| r = (m_fromLinear[r >> 4] + 0x80) >> 8; |
| g = (m_fromLinear[g >> 4] + 0x80) >> 8; |
| b = (m_fromLinear[b >> 4] + 0x80) >> 8; |
| return (a << 24) | (r << 16) | (g << 8) | b; |
| #endif |
| } |
| |
| QRgb fromLinear(QRgb rgb32) const |
| { |
| return convertWithTable(rgb32, m_fromLinear); |
| } |
| |
| QRgba64 fromLinear(QRgba64 rgb64) const |
| { |
| return convertWithTable(rgb64, m_fromLinear); |
| } |
| |
| int u8FromLinearF32(float f) const |
| { |
| ushort v = m_fromLinear[(int)(f * (255 * 16) + 0.5f)]; |
| return (v + 0x80) >> 8; |
| } |
| int u16FromLinearF32(float f) const |
| { |
| ushort v = m_fromLinear[(int)(f * (255 * 16) + 0.5f)]; |
| return v + (v >> 8); |
| } |
| float fromLinear(float f) const |
| { |
| ushort v = m_fromLinear[(int)(f * (255 * 16) + 0.5f)]; |
| return v * (1.0f / (255*256)); |
| } |
| |
| // We translate to 0-65280 (255*256) instead to 0-65535 to make simple |
| // shifting an accurate conversion. |
| // We translate from 0-4080 (255*16) for the same speed up, and to keep |
| // the tables small enough to fit in most inner caches. |
| ushort m_toLinear[(255 * 16) + 1]; // [0-4080] -> [0-65280] |
| ushort m_fromLinear[(255 * 16) + 1]; // [0-4080] -> [0-65280] |
| |
| private: |
| QColorTrcLut() { } |
| |
| Q_ALWAYS_INLINE static QRgb convertWithTable(QRgb rgb32, const ushort *table) |
| { |
| const int r = (table[qRed(rgb32) << 4] + 0x80) >> 8; |
| const int g = (table[qGreen(rgb32) << 4] + 0x80) >> 8; |
| const int b = (table[qBlue(rgb32) << 4] + 0x80) >> 8; |
| return (rgb32 & 0xff000000) | (r << 16) | (g << 8) | b; |
| } |
| Q_ALWAYS_INLINE static QRgba64 convertWithTable(QRgba64 rgb64, const ushort *table) |
| { |
| #if defined(__SSE2__) |
| __m128i v = _mm_loadl_epi64(reinterpret_cast<const __m128i *>(&rgb64)); |
| v = _mm_sub_epi16(v, _mm_srli_epi16(v, 8)); |
| const __m128i vidx = _mm_srli_epi16(v, 4); |
| const int ridx = _mm_extract_epi16(vidx, 2); |
| const int gidx = _mm_extract_epi16(vidx, 1); |
| const int bidx = _mm_extract_epi16(vidx, 0); |
| v = _mm_insert_epi16(v, table[ridx], 2); |
| v = _mm_insert_epi16(v, table[gidx], 1); |
| v = _mm_insert_epi16(v, table[bidx], 0); |
| v = _mm_add_epi16(v, _mm_srli_epi16(v, 8)); |
| QRgba64 rgba64; |
| _mm_storel_epi64(reinterpret_cast<__m128i *>(&rgba64), v); |
| return rgba64; |
| #elif (defined(__ARM_NEON__) || defined(__ARM_NEON)) && Q_BYTE_ORDER == Q_LITTLE_ENDIAN |
| uint16x4_t v = vreinterpret_u16_u64(vmov_n_u64(rgb64)); |
| v = vsub_u16(v, vshr_n_u16(v, 8)); |
| const uint16x4_t vidx = vshr_n_u16(v, 4); |
| const int ridx = vget_lane_u16(vidx, 2); |
| const int gidx = vget_lane_u16(vidx, 1); |
| const int bidx = vget_lane_u16(vidx, 0); |
| v = vset_lane_u16(table[ridx], v, 2); |
| v = vset_lane_u16(table[gidx], v, 1); |
| v = vset_lane_u16(table[bidx], v, 0); |
| v = vadd_u16(v, vshr_n_u16(v, 8)); |
| return QRgba64::fromRgba64(vget_lane_u64(vreinterpret_u64_u16(v), 0)); |
| #else |
| ushort r = rgb64.red(); |
| ushort g = rgb64.green(); |
| ushort b = rgb64.blue(); |
| r = r - (r >> 8); |
| g = g - (g >> 8); |
| b = b - (b >> 8); |
| r = table[r >> 4]; |
| g = table[g >> 4]; |
| b = table[b >> 4]; |
| r = r + (r >> 8); |
| g = g + (g >> 8); |
| b = b + (b >> 8); |
| return QRgba64::fromRgba64(r, g, b, rgb64.alpha()); |
| #endif |
| } |
| }; |
| |
| QT_END_NAMESPACE |
| |
| #endif // QCOLORTRCLUT_P_H |
