+/*
+ * AltiVec-enhanced yuv2yuvX
+ *
+ * Copyright (C) 2004 Romain Dolbeau <romain@dolbeau.org>
+ * based on the equivalent C code in swscale.c
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+static void FUNC(yuv2planeX_16)(const int16_t *filter, int filterSize,
+ const int16_t **src, uint8_t *dest,
+ const uint8_t *dither, int offset, int x)
+{
+ register int i, j;
+ LOCAL_ALIGNED(16, int, val, [16]);
+ vector signed int vo1, vo2, vo3, vo4;
+ vector unsigned short vs1, vs2;
+ vector unsigned char vf;
+ vector unsigned int altivec_vectorShiftInt19 =
+ vec_add(vec_splat_u32(10), vec_splat_u32(9));
+
+ for (i = 0; i < 16; i++)
+ val[i] = dither[(x + i + offset) & 7] << 12;
+
+ vo1 = vec_ld(0, val);
+ vo2 = vec_ld(16, val);
+ vo3 = vec_ld(32, val);
+ vo4 = vec_ld(48, val);
+
+ for (j = 0; j < filterSize; j++) {
+ unsigned int joffset=j<<1;
+ unsigned int xoffset=x<<1;
+ vector unsigned char perm;
+ vector signed short l1,vLumFilter;
+ LOAD_FILTER(vLumFilter,filter);
+ vLumFilter = vec_splat(vLumFilter, 0);
+ LOAD_L1(l1,src[j],perm);
+ yuv2planeX_8(vo1, vo2, l1, src[j], x, perm, vLumFilter);
+ yuv2planeX_8(vo3, vo4, l1, src[j], x + 8, perm, vLumFilter);
+ }
+
+ vo1 = vec_sra(vo1, altivec_vectorShiftInt19);
+ vo2 = vec_sra(vo2, altivec_vectorShiftInt19);
+ vo3 = vec_sra(vo3, altivec_vectorShiftInt19);
+ vo4 = vec_sra(vo4, altivec_vectorShiftInt19);
+ vs1 = vec_packsu(vo1, vo2);
+ vs2 = vec_packsu(vo3, vo4);
+ vf = vec_packsu(vs1, vs2);
+ VEC_ST(vf, 0, dest);
+}
+
+
+static inline void yuv2planeX_u(const int16_t *filter, int filterSize,
+ const int16_t **src, uint8_t *dest, int dstW,
+ const uint8_t *dither, int offset, int x)
+{
+ int i, j;
+
+ for (i = x; i < dstW; i++) {
+ int t = dither[(i + offset) & 7] << 12;
+ for (j = 0; j < filterSize; j++)
+ t += src[j][i] * filter[j];
+ dest[i] = av_clip_uint8(t >> 19);
+ }
+}
+
+static void FUNC(yuv2planeX)(const int16_t *filter, int filterSize,
+ const int16_t **src, uint8_t *dest, int dstW,
+ const uint8_t *dither, int offset)
+{
+ int dst_u = -(uintptr_t)dest & 15;
+ int i;
+
+ yuv2planeX_u(filter, filterSize, src, dest, dst_u, dither, offset, 0);
+
+ for (i = dst_u; i < dstW - 15; i += 16)
+ FUNC(yuv2planeX_16)(filter, filterSize, src, dest + i, dither,
+ offset, i);
+
+ yuv2planeX_u(filter, filterSize, src, dest, dstW, dither, offset, i);
+}
+
+static void FUNC(hScale_real)(SwsContext *c, int16_t *dst, int dstW,
+ const uint8_t *src, const int16_t *filter,
+ const int32_t *filterPos, int filterSize)
+{
+ register int i;
+ LOCAL_ALIGNED(16, int, tempo, [4]);
+
+ if (filterSize % 4) {
+ for (i = 0; i < dstW; i++) {
+ register int j;
+ register int srcPos = filterPos[i];
+ register int val = 0;
+ for (j = 0; j < filterSize; j++)
+ val += ((int)src[srcPos + j]) * filter[filterSize * i + j];
+ dst[i] = FFMIN(val >> 7, (1 << 15) - 1);
+ }
+ } else
+ switch (filterSize) {
+ case 4:
+ for (i = 0; i < dstW; i++) {
+ register int srcPos = filterPos[i];
+
+ vector unsigned char src_vF = unaligned_load(srcPos, src);
+ vector signed short src_v, filter_v;
+ vector signed int val_vEven, val_s;
+ src_v = // vec_unpackh sign-extends...
+ (vector signed short)(VEC_MERGEH((vector unsigned char)vzero, src_vF));
+ // now put our elements in the even slots
+ src_v = vec_mergeh(src_v, (vector signed short)vzero);
+ GET_VF4(i, filter_v, filter);
+ val_vEven = vec_mule(src_v, filter_v);
+ val_s = vec_sums(val_vEven, vzero);
+ vec_st(val_s, 0, tempo);
+ dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
+ }
+ break;
+ case 8:
+ for (i = 0; i < dstW; i++) {
+ register int srcPos = filterPos[i];
+ vector unsigned char src_vF, src_v0, src_v1;
+ vector unsigned char permS;
+ vector signed short src_v, filter_v;
+ vector signed int val_v, val_s;
+ FIRST_LOAD(src_v0, srcPos, src, permS);
+ LOAD_SRCV8(srcPos, 0, src, permS, src_v0, src_v1, src_vF);
+ src_v = // vec_unpackh sign-extends...
+ (vector signed short)(VEC_MERGEH((vector unsigned char)vzero, src_vF));
+ filter_v = vec_ld(i << 4, filter);
+ val_v = vec_msums(src_v, filter_v, (vector signed int)vzero);
+ val_s = vec_sums(val_v, vzero);
+ vec_st(val_s, 0, tempo);
+ dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
+ }
+ break;
+
+ case 16:
+ for (i = 0; i < dstW; i++) {
+ register int srcPos = filterPos[i];
+
+ vector unsigned char src_vF = unaligned_load(srcPos, src);
+ vector signed short src_vA = // vec_unpackh sign-extends...
+ (vector signed short)(VEC_MERGEH((vector unsigned char)vzero, src_vF));
+ vector signed short src_vB = // vec_unpackh sign-extends...
+ (vector signed short)(VEC_MERGEL((vector unsigned char)vzero, src_vF));
+ vector signed short filter_v0 = vec_ld(i << 5, filter);
+ vector signed short filter_v1 = vec_ld((i << 5) + 16, filter);
+
+ vector signed int val_acc = vec_msums(src_vA, filter_v0, (vector signed int)vzero);
+ vector signed int val_v = vec_msums(src_vB, filter_v1, val_acc);
+
+ vector signed int val_s = vec_sums(val_v, vzero);
+
+ VEC_ST(val_s, 0, tempo);
+ dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
+ }
+ break;
+
+ default:
+ for (i = 0; i < dstW; i++) {
+ register int j, offset = i * 2 * filterSize;
+ register int srcPos = filterPos[i];
+
+ vector signed int val_s, val_v = (vector signed int)vzero;
+ vector signed short filter_v0R;
+ vector unsigned char permF, src_v0, permS;
+ FIRST_LOAD(filter_v0R, offset, filter, permF);
+ FIRST_LOAD(src_v0, srcPos, src, permS);
+
+ for (j = 0; j < filterSize - 15; j += 16) {
+ vector unsigned char src_v1, src_vF;
+ vector signed short filter_v1R, filter_v2R, filter_v0, filter_v1;
+ LOAD_SRCV(srcPos, j, src, permS, src_v0, src_v1, src_vF);
+ vector signed short src_vA = // vec_unpackh sign-extends...
+ (vector signed short)(VEC_MERGEH((vector unsigned char)vzero, src_vF));
+ vector signed short src_vB = // vec_unpackh sign-extends...
+ (vector signed short)(VEC_MERGEL((vector unsigned char)vzero, src_vF));
+ GET_VFD(i, j, filter, filter_v0R, filter_v1R, permF, filter_v0, 0);
+ GET_VFD(i, j, filter, filter_v1R, filter_v2R, permF, filter_v1, 16);
+
+ vector signed int val_acc = vec_msums(src_vA, filter_v0, val_v);
+ val_v = vec_msums(src_vB, filter_v1, val_acc);
+ UPDATE_PTR(filter_v2R, filter_v0R, src_v1, src_v0);
+ }
+
+ if (j < filterSize - 7) {
+ // loading src_v0 is useless, it's already done above
+ vector unsigned char src_v1, src_vF;
+ vector signed short src_v, filter_v1R, filter_v;
+ LOAD_SRCV8(srcPos, j, src, permS, src_v0, src_v1, src_vF);
+ src_v = // vec_unpackh sign-extends...
+ (vector signed short)(VEC_MERGEH((vector unsigned char)vzero, src_vF));
+ GET_VFD(i, j, filter, filter_v0R, filter_v1R, permF, filter_v, 0);
+ val_v = vec_msums(src_v, filter_v, val_v);
+ }
+ val_s = vec_sums(val_v, vzero);
+
+ VEC_ST(val_s, 0, tempo);
+ dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
+ }
+ }
+}