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# Pure Data Packet mmx routine.
# Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
.globl pixel_unpack_u8s16_y
.type pixel_unpack_u8s16_y,@function
# mmx rgba pixel gain
# void pixel_unpack_u8s16_y(char *input, char *output, int32 nb_pixels_div8)
pixel_unpack_u8s16_y:
pushl %ebp
movl %esp, %ebp
push %esi
push %edi
# movl 20(%ebp), %edi # int16[4] array of gains
# movq (%edi), %mm7 # get gain array
movl 8(%ebp), %esi # input uint8 pixel array
movl 12(%ebp), %edi # output sint16 pixel array
movl 16(%ebp), %ecx # nb of elements div 8
.align 16
.loop_unpack_y:
movq (%esi), %mm5 # load 8 pixels from memory
pxor %mm0, %mm0 # zero mm0 - mm3
pxor %mm1, %mm1
punpcklbw %mm5, %mm0 # unpack 1st 4 pixels
punpckhbw %mm5, %mm1 # unpack 2nd 4 pixles
psrlw $0x1, %mm0 # shift right to clear sign bit 9.7
psrlw $0x1, %mm1
# pmulhw %mm7, %mm0 # apply gain
# pmulhw %mm7, %mm1
# paddsw %mm0, %mm0 # correct factor 2
# paddsw %mm1, %mm1
movq %mm0, (%edi) # store
movq %mm1, 8(%edi)
addl $8, %esi # increment source pointer
addl $16, %edi # increment dest pointer
decl %ecx
jnz .loop_unpack_y # loop
emms
pop %edi
pop %esi
leave
ret
.globl pixel_unpack_u8s16_uv
.type pixel_unpack_u8s16_uv,@function
pixel_unpack_u8s16_uv:
pushl %ebp
movl %esp, %ebp
push %esi
push %edi
# movl 20(%ebp), %edi # int16[4] array of gains
# movq (%edi), %mm7 # get gain array
movl 8(%ebp), %esi # input uint8 pixel array
movl 12(%ebp), %edi # output sint16 pixel array
movl 16(%ebp), %ecx # nb of elements div 8
pcmpeqw %mm6, %mm6
psllw $15, %mm6
.align 16
.loop_unpack_uv:
movq (%esi), %mm5 # load 8 pixels from memory
pxor %mm0, %mm0 # zero mm0 - mm3
pxor %mm1, %mm1
punpcklbw %mm5, %mm0 # unpack 1st 4 pixels
punpckhbw %mm5, %mm1 # unpack 2nd 4 pixles
pxor %mm6, %mm0 # flip sign bit (Cr and Cb are ofset by 128)
pxor %mm6, %mm1
# pmulhw %mm7, %mm0 # apply gain
# pmulhw %mm7, %mm1
# paddsw %mm0, %mm0 # correct factor 2
# paddsw %mm1, %mm1
movq %mm0, (%edi) # store
movq %mm1, 8(%edi)
addl $8, %esi # increment source pointer
addl $16, %edi # increment dest pointer
decl %ecx
jnz .loop_unpack_uv # loop
emms
pop %edi
pop %esi
leave
ret
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