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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.
#
# intermediate function
# input in register:
# %mm0: left 4 pixels
# %mm1: middle 4 pixels
# %mm2: right 4 pixels
# %mm5: left 4 pixel masks
# %mm6: middle 4 pixel masks
# %mm7: right 4 pixel masks
# return in register:
# %mm0: middle 4 pixels result
.conv_hor_4_pixels:
.align 16
# compute quadruplet
# get left pixels
psrlq $48, %mm0 # shift word 3 to byte 0
movq %mm1, %mm4
psllq $16, %mm4 # shift word 0,1,2 to 1,2,3
por %mm4, %mm0 # combine
pmulhw %mm5, %mm0
psllw $1, %mm0
# get middle pixels
movq %mm1, %mm4
pmulhw %mm6, %mm4
psllw $1, %mm4
paddsw %mm4, %mm0
# get right pixels
movq %mm2, %mm3
psllq $48, %mm3 # shift word 0 to word 3
movq %mm1, %mm4
psrlq $16, %mm4 # shift word 1,2,3 to 0,1,2
por %mm4, %mm3 # combine
pmulhw %mm7, %mm3
psllw $1, %mm3
paddsw %mm3, %mm0 # accumulate
ret
.globl pixel_conv_hor_s16
.type pixel_conv_hor_s16,@function
# pixel_conv_hor_s16(short int *pixel_array, int nb_4_pixel_vectors, short int border[4], short int mask[12])
# horizontal unsigned pixel conv (1/4 1/2 1/4) not tested
# NOT TESTED
pixel_conv_hor_s16:
pushl %ebp
movl %esp, %ebp
push %esi
push %edi
movl 8(%ebp), %esi # pixel array offset
movl 12(%ebp), %ecx # nb of 8 pixel vectors in a row (at least 2)
movl 20(%ebp), %edi # mask vector
movq (%edi), %mm5
movq 8(%edi), %mm6
movq 16(%edi), %mm7
movl 16(%ebp), %edi # boundary pixel vector
movq (%edi), %mm0 # init regs (left edge, so mm0 is zero)
movq (%esi), %mm1
movq 8(%esi), %mm2
decl %ecx # loop has 2 terminator stubs
decl %ecx # todo: handle if ecx < 3
jmp .conv_line_loop
.align 16
.conv_line_loop:
call .conv_hor_4_pixels # compute conv
movq %mm0, (%esi) # store result
movq %mm1, %mm0 # mm0 <- prev (%esi)
movq %mm2, %mm1 # mm1 <- 8(%esi)
movq 16(%esi), %mm2 # mm2 <- 16(%esi)
addl $8, %esi # increase pointer
decl %ecx
jnz .conv_line_loop
call .conv_hor_4_pixels # compute conv
movq %mm0, (%esi) # store result
movq %mm1, %mm0 # mm0 <- prev (%esi)
movq %mm2, %mm1 # mm1 <- 8(%esi)
movq (%edi), %mm2 # mm2 <- border
call .conv_hor_4_pixels # compute last vector
movq %mm0, 8(%esi) # store it
emms
pop %edi
pop %esi
leave
ret
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