mirror of
https://github.com/gryf/wmaker.git
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286 lines
7.0 KiB
C
286 lines
7.0 KiB
C
/* x86_convert.c - convert RImage to XImage with x86 optimizations
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*
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* Raster graphics library
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*
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* Copyright (c) 2000 Alfredo K. Kojima
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <config.h>
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#ifdef ASM_X86_MMX
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int
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x86_check_mmx()
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{
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static int result = 1;
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if (result >= 0)
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return result;
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result = 0;
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#if 0
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asm volatile
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("pushfl \n" // check whether cpuid supported
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"pop %%eax \n"
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"movl %%eax, %%ebx \n"
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"xorl 1<<21, %%eax \n"
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"pushfl %%eax \n"
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"popfd \n"
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"pushfl \n"
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"popl %%eax \n"
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"xorl %%eax, %%ebx \n"
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"andl 1<<21, %%eax \n"
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"jz .NotPentium \n"
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"xorl %%eax, %%eax \n"
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"movl $1, %%eax \n"
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"cpuid \n"
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"test 1<<23, %%edx \n"
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"jz .NotMMX \n"
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"movl $1, %%0 \n"
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".NotMMX: \n"
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".Bye: \n"
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".NotPentium: \n"
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: "=rm" (result));
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#endif
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return result;
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}
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void
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x86_TrueColor_32_to_16(unsigned char *image, // 8
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unsigned short *ximage, // 12
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short *err, // 16
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short *nerr, // 20
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short *rtable, // 24
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short *gtable, // 28
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short *btable, // 32
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int dr, // 36
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int dg, // 40
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int db, // 44
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unsigned int roffs, // 48
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unsigned int goffs, // 52
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unsigned int boffs, // 56
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int width, // 60
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int height, // 64
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int line_offset) // 68
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{
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/*
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int x; //-4
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long long rrggbbaa;// -16
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long long pixel; //-24
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short *tmp_err; //-32
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short *tmp_nerr; //-36
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*/
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asm volatile
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(
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"subl $64, %esp \n" // alloc some more stack
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"pusha \n"
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// pack dr, dg and db into mm6
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"movl 36(%ebp), %eax \n"
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"movl 40(%ebp), %ebx \n"
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"movw %ax, -16(%ebp) \n"
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"movw %bx, -14(%ebp) \n"
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"movl 44(%ebp), %eax \n"
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"movw $0, -10(%ebp) \n"
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"movw %ax, -12(%ebp) \n"
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"movq -16(%ebp), %mm6 \n" // dr dg db 0
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// pack 4|4|4|4 into mm7, for shifting (/16)
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"movl $0x00040004, -16(%ebp) \n"
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"movl $0x00040004, -12(%ebp) \n"
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"movq -16(%ebp), %mm7 \n"
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// store constant values for using with mmx when dithering
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"movl $0x00070007, -16(%ebp) \n"
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"movl $0x00070007, -12(%ebp) \n"
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"movq -16(%ebp), %mm5 \n"
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"movl $0x00050005, -16(%ebp) \n"
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"movl $0x00050005, -12(%ebp) \n"
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"movq -16(%ebp), %mm4 \n"
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"movl $0x00030003, -16(%ebp) \n"
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"movl $0x00030003, -12(%ebp) \n"
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"movq -16(%ebp), %mm3 \n"
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// process 1 pixel / cycle, each component treated as 16bit
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"movl 8(%ebp), %esi \n" // esi = image->data
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".LoopY: \n"
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"movl 60(%ebp), %eax \n"
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"movl %eax, -4(%ebp) \n" // x = width
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"movl 64(%ebp), %eax \n"
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"decl %eax \n" // y--
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"movl %eax, 64(%ebp) \n"
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"js .End \n" // if y < 0, goto end
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"andl $1, %eax \n"
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"jz .LoopY_1 \n" // if (y&1) goto LoopY_1
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".LoopY_0: \n"
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"movl 16(%ebp), %ebx \n" // ebx = err
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"movl %ebx, -36(%ebp) \n" // [-36] = err
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"movl 20(%ebp), %eax \n" //
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"movl %eax, -32(%ebp) \n" // [-32] = nerr
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"jmp .LoopX \n"
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".LoopY_1: \n"
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"movl 20(%ebp), %ebx \n" // ebx = nerr
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"movl %ebx, -36(%ebp) \n" // [-36] = nerr
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"movl 16(%ebp), %eax \n" //
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"movl %eax, -32(%ebp) \n" // [-32] = eerr
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".LoopX: \n"
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// calculate errors and pixel components
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// depend on ebx, esi, mm6
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"movq (%ebx), %mm1 \n" // mm1 = error[0..3]
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"punpcklbw (%esi), %mm0 \n" // mm0 = image->data[0..3]
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"psrlw $8, %mm0 \n" // fixup mm0
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"paddusb %mm1, %mm0 \n" // mm0 = mm0 + mm1 (sat. to 255)
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"movq %mm0, -24(%ebp) \n" // save the pixel
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"movzwl -24(%ebp), %ecx \n" // ecx = pixel.red
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"movl 24(%ebp), %edi \n" // edi = rtable
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"leal (%edi, %ecx, 2), %eax \n" // eax = &rtable[pixel.red]
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"movl (%eax), %edx \n" // edx = rtable[pixel.red]
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"movw %dx, -16(%ebp) \n" // save rr
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"movzwl -22(%ebp), %ecx \n" // ecx = pixel.green
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"movl 28(%ebp), %edi \n" // edi = gtable
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"leal (%edi, %ecx, 2), %eax \n" // eax = >able[pixel.green]
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"movl (%eax), %edx \n" // ebx = gtable[pixel.green]
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"movw %dx, -14(%ebp) \n" // save gg
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"movzwl -20(%ebp), %ecx \n" // ecx = pixel.blue
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"movl 32(%ebp), %edi \n" // ebx = btable
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"leal (%edi, %ecx, 2), %eax \n" // eax = &btable[pixel.blue]
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"movl (%eax), %edx \n" // ecx = btable[pixel.blue]
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"movw %dx, -12(%ebp) \n" // save bb
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"movw $0, -10(%ebp) \n" // save dummy aa
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"movq -16(%ebp), %mm1 \n" // load mm1 with rrggbbaa
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"pmullw %mm6, %mm1 \n" // mm1 = rr*dr|...
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"psubsw %mm1, %mm0 \n" // error = pixel - mm1
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// distribute the error
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// depend on mm0, mm7, mm3, mm4, mm5
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"movl -36(%ebp), %ebx \n"
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"movq %mm0, %mm1 \n"
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"pmullw %mm5, %mm1 \n" // mm1 = mm1*7
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"psrlw %mm7, %mm1 \n" // mm1 = mm1/16
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"paddw 8(%ebx), %mm1 \n"
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"movq %mm1, 8(%ebx) \n" // err[x+1,y] = rer*7/16
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"movl -32(%ebp), %ebx \n"
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"movq %mm0, %mm1 \n"
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"pmullw %mm4, %mm1 \n" // mm1 = mm1*5
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"psrlw %mm7, %mm1 \n" // mm1 = mm1/16
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"paddw -8(%ebx), %mm1 \n"
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"movq %mm1, -8(%ebx) \n" // err[x-1,y+1] += rer*3/16
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"movq %mm0, %mm1 \n"
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"pmullw %mm3, %mm1 \n" // mm1 = mm1*3
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"psrlw %mm7, %mm1 \n" // mm1 = mm1/16
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"paddw 8(%ebx), %mm1 \n"
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"movq %mm1, (%ebx) \n" // err[x,y+1] += rer*5/16
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"psrlw %mm7, %mm0 \n" // mm0 = mm0/16
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"movq %mm0, 8(%ebx) \n" // err[x+1,y+1] = rer/16
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// calculate final pixel value and store
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"movl 48(%ebp), %ecx \n"
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"movw -16(%ebp), %ax \n"
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"shlw %cl, %ax \n" //NP* ax = r<<roffs
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"movl 52(%ebp), %ecx \n"
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"movw -14(%ebp), %bx \n"
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"shlw %cl, %bx \n" //NP*
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"orw %bx, %ax \n"
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"movl 56(%ebp), %ecx \n"
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"movw -12(%ebp), %bx \n"
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"shlw %cl, %bx \n" //NP*
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"orw %bx, %ax \n"
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"movl 12(%ebp), %edx \n"
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"movw %ax, (%edx) \n"
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"addl $2, %edx \n" // increment ximage
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"movl %edx, 12(%ebp) \n"
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// prepare for next iteration on X
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"addl $8, -32(%ebp) \n" // nerr += 8
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"movl -36(%ebp), %ebx \n"
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"addl $8, %ebx \n"
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"movl %ebx, -36(%ebp) \n" // ebx = err += 8
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// Note: in the last pixel, this would cause an invalid memory access
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// because, punpcklbw is used (which reads 8 bytes) and the last
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// pixel is only 4 bytes. This is no problem because the image data
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// was allocated with extra 4 bytes when created.
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"addl $4, %esi \n" // image->data += 4
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"decl -4(%ebp) \n" // x--
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"jnz .LoopX \n" // if x>0, goto .LoopX
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// depend on edx
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"addl 68(%ebp), %edx \n" // add extra offset to ximage
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"movl %edx, 12(%ebp) \n"
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"jmp .LoopY \n"
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".End: \n" // THE END
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"emms \n"
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"popa \n"
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);
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}
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#endif /* ASM_X86_MMX */
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