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;******************************************************************************
;* x86-optimized horizontal line scaling functions
;* Copyright 2020 Google LLC
;* Copyright (c) 2011 Ronald S. Bultje <rsbultje@gmail.com>
;*
;* 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
;******************************************************************************
%include "libavutil/x86/x86util.asm"
SECTION_RODATA 32
swizzle: dd 0, 4, 1, 5, 2, 6, 3, 7
four: times 8 dd 4
SECTION .text
;-----------------------------------------------------------------------------
; horizontal line scaling
;
; void hscale8to15_<filterSize>_<opt>
; (SwsContext *c, int16_t *dst,
; int dstW, const uint8_t *src,
; const int16_t *filter,
; const int32_t *filterPos, int filterSize);
;
; Scale one horizontal line. Input is 8-bit width Filter is 14 bits. Output is
; 15 bits (in int16_t). Each output pixel is generated from $filterSize input
; pixels, the position of the first pixel is given in filterPos[nOutputPixel].
;-----------------------------------------------------------------------------
%macro SCALE_FUNC 1
cglobal hscale8to15_%1, 7, 9, 16, pos0, dst, w, srcmem, filter, fltpos, fltsize, count, inner
pxor m0, m0
mova m15, [swizzle]
mov countq, $0
movsxd wq, wd
%ifidn %1, X4
mova m14, [four]
shr fltsized, 2
%endif
.loop:
movu m1, [fltposq]
movu m2, [fltposq+32]
%ifidn %1, X4
pxor m9, m9
pxor m10, m10
pxor m11, m11
pxor m12, m12
mov innerq, $0
.innerloop:
%endif
vpcmpeqd m13, m13
vpgatherdd m3,[srcmemq + m1], m13
vpcmpeqd m13, m13
vpgatherdd m4,[srcmemq + m2], m13
vpunpcklbw m5, m3, m0
vpunpckhbw m6, m3, m0
vpunpcklbw m7, m4, m0
vpunpckhbw m8, m4, m0
vpmaddwd m5, m5, [filterq]
vpmaddwd m6, m6, [filterq + 32]
vpmaddwd m7, m7, [filterq + 64]
vpmaddwd m8, m8, [filterq + 96]
add filterq, $80
%ifidn %1, X4
paddd m9, m5
paddd m10, m6
paddd m11, m7
paddd m12, m8
paddd m1, m14
paddd m2, m14
add innerq, $1
cmp innerq, fltsizeq
jl .innerloop
vphaddd m5, m9, m10
vphaddd m6, m11, m12
%else
vphaddd m5, m5, m6
vphaddd m6, m7, m8
%endif
vpsrad m5, 7
vpsrad m6, 7
vpackssdw m5, m5, m6
vpermd m5, m15, m5
vmovdqu [dstq + countq * 2], m5
add fltposq, $40
add countq, $10
cmp countq, wq
jl .loop
REP_RET
%endmacro
%if ARCH_X86_64
INIT_YMM avx2
SCALE_FUNC 4
SCALE_FUNC X4
%endif
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