mirror of
https://github.com/gryf/wmaker.git
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630 lines
27 KiB
C
630 lines
27 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) 2000-2003 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
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#ifdef ASM_X86_MMX
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int 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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asm volatile (
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"pushal \n\t" /* please dont forget this in any asm */
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"pushfl \n\t" /* check whether cpuid supported */
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"pop %%eax \n\t"
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"movl %%eax, %%ebx \n\t"
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"xorl $(1<<21), %%eax \n\t"
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"pushl %%eax \n\t"
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"popfl \n\t"
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"pushfl \n\t"
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"popl %%eax \n\t"
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"xorl %%ebx, %%eax \n\t"
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"andl $(1<<21), %%eax \n\t"
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"jz .NotPentium \n\t"
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"xorl %%eax, %%eax \n\t" /* no eax effect because of the movl below */
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/* except reseting flags. is it needed? */
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"movl $1, %%eax \n\t"
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"cpuid \n\t"
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"test $(1<<23), %%edx \n\t"
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"jz .NotMMX \n\t"
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"popal \n\t" /* popal needed because the address of */
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"movl $1, %0 \n\t" /* variable %0 may be kept in a register */
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"jmp .noPop \n\t"
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".NotMMX: \n\t"
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".NotPentium: \n\t"
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"popal \n\t"
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".noPop: \n\t"
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: "=m" (result)
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);
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return result;
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}
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/*
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* TODO:
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* 32/8 24/8 32/16 24/16 32/24 24/24
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* PPlain YES YES
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* MMX DONE
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*
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*
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* - try to align stack (local variable space) into quadword boundary
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*/
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void
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x86_mmx_TrueColor_32_to_16(unsigned char *image,
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unsigned short *ximage,
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short *err,
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short *nerr,
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unsigned short *rtable,
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unsigned short *gtable,
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unsigned short *btable,
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int dr,
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int dg,
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int db,
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unsigned int roffs,
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unsigned int goffs, unsigned int boffs, int width, int height, int line_offset)
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{
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union {
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long long rrggbbaa;
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struct {
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short int rr, gg, bb, aa;
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} words;
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} rrggbbaa;
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union {
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long long pixel;
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struct {
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short int rr, gg, bb, aa;
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} words;
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} pixel;
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short *tmp_err;
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short *tmp_nerr;
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int x;
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asm volatile (
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"pushl %%ebx \n\t"
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/* pack dr, dg and db into mm6 */
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"movl %7, %%eax \n\t"
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"movl %8, %%ebx \n\t"
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"movl %9, %%ecx \n\t"
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"movw %%ax, %16 \n\t"
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"movw %%bx, %17 \n\t"
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"movw %%cx, %18 \n\t"
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"movw $0, %19 \n\t"
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"movq %16, %%mm6 \n\t" /* 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 \n\t"
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"movl $0x00040004, %18 \n\t"
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"movq %16, %%mm7 \n\t"
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/* store constant values for using with mmx when dithering */
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"movl $0x00070007, %16 \n\t"
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"movl $0x00070007, %18 \n\t"
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"movq %16, %%mm5 \n\t"
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"movl $0x00050005, %16 \n\t"
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"movl $0x00050005, %18 \n\t"
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"movq %16, %%mm4 \n\t"
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"movl $0x00030003, %16 \n\t"
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"movl $0x00030003, %18 \n\t"
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"movq %16, %%mm3 \n\t"
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/* process 1 pixel / cycle, each component treated as 16bit */
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"movl %0, %%esi \n\t" /* esi = image->data */
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".LoopYa: \n\t"
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"movl %13, %%eax \n\t"
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"movl %%eax, %26 \n\t" /* x = width */
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"movl %14, %%eax \n\t"
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"decl %%eax \n\t" /* y-- */
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"movl %%eax, %14 \n\t"
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"js .Enda \n\t" /* if y < 0, goto end */
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"andl $1, %%eax \n\t"
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"jz .LoopY_1a \n\t" /* if (y & 1) goto LoopY_1 */
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".LoopY_0a: \n\t"
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"movl %2, %%ebx \n\t" /* ebx = err */
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"movl %%ebx, %25 \n\t" /* [-36] = err */
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"movl %3, %%eax \n\t"
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"movl %%eax, %24 \n\t" /* [-32] = nerr */
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"jmp .LoopXa \n\t"
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".LoopY_1a: \n\t"
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"movl %3, %%ebx \n\t" /* ebx = nerr */
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"movl %%ebx, %25 \n\t" /* [-36] = nerr */
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"movl %2, %%eax \n\t"
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"movl %%eax, %24 \n\t" /* [-32] = eerr */
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".align 16 \n\t"
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".LoopXa: \n\t"
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/* calculate errors and pixel components; depend on ebx, esi, mm6 */
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"movq (%%ebx), %%mm1 \n\t" /* mm1 = error[0..3] */
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"punpcklbw (%%esi), %%mm0 \n\t" /* mm0 = image->data[0..3] */
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"psrlw $8, %%mm0 \n\t" /* fixup mm0 */
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"paddusb %%mm1, %%mm0 \n\t" /* mm0 = mm0 + mm1 (sat. to 255) */
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"movq %%mm0, %20 \n\t" /* save the pixel */
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"movzwl %20, %%ecx \n\t" /* ecx = pixel.red */
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"movl %4, %%edi \n\t" /* edi = rtable */
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/* agi */
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"leal (%%edi, %%ecx, 2), %%eax \n\t" /* eax = &rtable[pixel.red] */
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/* agi */
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"movw (%%eax), %%dx \n\t" /* dx = rtable[pixel.red] */
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"movw %%dx, %16 \n\t" /* save rr */
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"movzwl %21, %%ecx \n\t" /* ecx = pixel.green */
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"movl %5, %%edi \n\t" /* edi = gtable */
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/* agi */
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"leal (%%edi, %%ecx, 2), %%eax \n\t" /* eax = >able[pixel.green] */
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/* agi */
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"movw (%%eax), %%dx \n\t" /* dx = gtable[pixel.green] */
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"movw %%dx, %17 \n\t" /* save gg */
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"movzwl %22, %%ecx \n\t" /* ecx = pixel.blue */
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"movl %6, %%edi \n\t" /* ebx = btable */
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/* agi */
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"leal (%%edi, %%ecx, 2), %%eax \n\t" /* eax = &btable[pixel.blue] */
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/* agi */
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"movw (%%eax), %%dx \n\t" /* dx = btable[pixel.blue] */
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"movw %%dx, %18 \n\t" /* save bb */
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"movw $0, %19 \n\t" /* save dummy aa */
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"movq %16, %%mm1 \n\t" /* load mm1 with rrggbbaa */
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"pmullw %%mm6, %%mm1 \n\t" /* mm1 = rr*dr|... */
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"psubsw %%mm1, %%mm0 \n\t" /* error = pixel - mm1 */
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/* distribute the error; depend on mm0, mm7, mm3, mm4, mm5 */
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"movl %25, %%ebx \n\t"
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"movq %%mm0, %%mm1 \n\t"
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"pmullw %%mm5, %%mm1 \n\t" /* mm1 = mm1*7 */
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"psrlw %%mm7, %%mm1 \n\t" /* mm1 = mm1/16 */
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"paddw 8(%%ebx), %%mm1 \n\t"
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"movq %%mm1, 8(%%ebx) \n\t" /* err[x+1,y] = rer*7/16 */
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"movl %24, %%ebx \n\t"
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"movq %%mm0, %%mm1 \n\t"
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"pmullw %%mm4, %%mm1 \n\t" /* mm1 = mm1*5 */
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"psrlw %%mm7, %%mm1 \n\t" /* mm1 = mm1/16 */
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"paddw -8(%%ebx), %%mm1 \n\t"
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"movq %%mm1, -8(%%ebx) \n\t" /* err[x-1,y+1] += rer*3/16 */
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"movq %%mm0, %%mm1 \n\t"
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"pmullw %%mm3, %%mm1 \n\t" /* mm1 = mm1*3 */
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"psrlw %%mm7, %%mm1 \n\t" /* mm1 = mm1/16 */
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"paddw 8(%%ebx), %%mm1 \n\t"
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"movq %%mm1, (%%ebx) \n\t" /* err[x,y+1] += rer*5/16 */
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"psrlw %%mm7, %%mm0 \n\t" /* mm0 = mm0/16 */
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"movq %%mm0, 8(%%ebx) \n\t" /* err[x+1,y+1] = rer/16 */
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/* calculate final pixel value and store */
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"movl %10, %%ecx \n\t"
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"movw %16, %%ax \n\t"
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"shlw %%cl, %%ax \n\t" /* NP* ax = r<<roffs */
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"movl %11, %%ecx \n\t"
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"movw %17, %%bx \n\t"
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"shlw %%cl, %%bx \n\t" /* NP* */
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"orw %%bx, %%ax \n\t"
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"movl %12, %%ecx \n\t"
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"movw %18, %%bx \n\t"
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"shlw %%cl, %%bx \n\t" /* NP* */
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"orw %%bx, %%ax \n\t"
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"movl %1, %%edx \n\t"
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"movw %%ax, (%%edx) \n\t"
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"addl $2, %%edx \n\t" /* increment ximage */
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"movl %%edx, %1 \n\t"
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/* prepare for next iteration on X */
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"addl $8, %24 \n\t" /* nerr += 8 */
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"movl %25, %%ebx \n\t"
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"addl $8, %%ebx \n\t"
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"movl %%ebx, %25 \n\t" /* 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\t" /* image->data += 4 */
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"decl %26 \n\t" /* x-- */
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"jnz .LoopXa \n\t" /* if x>0, goto .LoopX */
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/* depend on edx */
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"addl %15, %%edx \n\t" /* add extra offset to ximage */
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"movl %%edx, %1 \n\t"
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"jmp .LoopYa \n\t"
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".Enda: \n\t" /* THE END */
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"emms \n\t"
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"popl %%ebx \n\t"
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:
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: "m" (image), /* %0 */
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"m" (ximage), /* %1 */
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"m" (err), /* %2 */
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"m" (nerr), /* %3 */
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"m" (rtable), /* %4 */
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"m" (gtable), /* %5 */
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"m" (btable), /* %6 */
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"m" (dr), /* %7 */
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"m" (dg), /* %8 */
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"m" (db), /* %9 */
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"m" (roffs), /* %10 */
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"m" (goffs), /* %11 */
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"m" (boffs), /* %12 */
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"m" (width), /* %13 */
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"m" (height), /* %14 */
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"m" (line_offset), /* %15 */
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"m" (rrggbbaa.words.rr), /* %16 (access to rr) */
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"m" (rrggbbaa.words.gg), /* %17 (access to gg) */
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"m" (rrggbbaa.words.bb), /* %18 (access to bb) */
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"m" (rrggbbaa.words.aa), /* %19 (access to aa) */
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"m" (pixel.words.rr), /* %20 (access to pixel.r) */
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"m" (pixel.words.gg), /* %21 (access to pixel.g) */
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"m" (pixel.words.bb), /* %22 (access to pixel.b) */
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"m" (pixel.words.aa), /* %23 (access to pixel.a) */
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"m" (tmp_err), /* %24 */
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"m" (tmp_nerr), /* %25 */
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"m" (x) /* %26 */
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: "eax",
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"ecx",
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"edx",
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"esi",
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"edi"
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);
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}
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void
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x86_mmx_TrueColor_24_to_16(unsigned char *image,
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unsigned short *ximage,
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short *err,
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short *nerr,
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short *rtable,
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short *gtable,
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short *btable,
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int dr,
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int dg,
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int db,
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unsigned int roffs,
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unsigned int goffs, unsigned int boffs, int width, int height, int line_offset)
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{
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union {
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long long rrggbbaa;
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struct {
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short int rr, gg, bb, aa;
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} words;
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} rrggbbaa;
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union {
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long long pixel;
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struct {
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short int rr, gg, bb, aa;
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} words;
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} pixel;
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short *tmp_err;
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short *tmp_nerr;
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int x;
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int w1;
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int w2;
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asm volatile (
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"pushl %%ebx \n\t"
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"movl %13, %%eax \n\t" /* eax = width */
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"movl %%eax, %%ebx \n\t"
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"shrl $2, %%eax \n\t"
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"movl %%eax, %27 \n\t" /* w1 = width / 4 */
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"andl $3, %%ebx \n\t"
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"movl %%ebx, %28 \n\t" /* w2 = width %% 4 */
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".LoopYc: \n\t"
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"movl %13, %%eax \n\t"
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"movl %%eax, %26 \n\t" /* x = width */
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"decl %14 \n\t" /* height-- */
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"js .Endc \n\t" /* if height < 0 then end */
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"movl %14, %%eax \n\t"
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"decl %%eax \n\t" /* y-- */
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"movl %%eax, %14 \n\t"
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"js .Endc \n\t" /* if y < 0, goto end */
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"andl $1, %%eax \n\t"
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"jz .LoopY_1c \n\t" /* if (y&1) goto LoopY_1 */
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".LoopY_0c: \n\t"
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"movl %2, %%ebx \n\t" /* ebx = err */
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"movl %%ebx, %25 \n\t" /* [-36] = err */
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"movl %3, %%eax \n\t"
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"movl %%eax, %24 \n\t" /* [-32] = nerr */
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"jmp .LoopX_1c \n\t"
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".LoopY_1c: \n\t"
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"movl %3, %%ebx \n\t" /* ebx = nerr */
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"movl %%ebx, %25 \n\t" /* [-36] = nerr */
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"movl %2, %%eax \n\t"
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"movl %%eax, %24 \n\t" /* [-32] = eerr */
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".align 16 \n\t"
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"movl %%eax, %26 \n\t" /* x = w1 */
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".LoopX_1c: \n\t"
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"decl %26 \n\t" /* x-- */
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"js .Xend1_c \n\t" /* if x < 0 then end */
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/* do conversion of 4 pixels */
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"movq %2, %%mm0 \n\t" /* mm0 = err */
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"jmp .LoopX_1c \n\t"
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".Xend1_c: \n\t"
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"movl %28, %%eax \n\t"
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"movl %%eax, %26 \n\t" /* x = w2 */
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".LoopX_2c: \n\t"
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"decl %26 \n\t" /* x-- */
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"js .Xend2_c \n\t"
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/* do conversion */
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"jmp .LoopX_2c \n\t"
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".Xend2_c: \n\t"
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"movl %27, %%eax \n\t"
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"jmp .LoopYc \n\t"
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".Endc: \n\t" /* THE END */
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"emms \n\t"
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"popl %%ebx \n\t"
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:
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: "m" (image), /* %0 */
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"m" (ximage), /* %1 */
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"m" (err), /* %2 */
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"m" (nerr), /* %3 */
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"m" (rtable), /* %4 */
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"m" (gtable), /* %5 */
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"m" (btable), /* %6 */
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"m" (dr), /* %7 */
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"m" (dg), /* %8 */
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"m" (db), /* %9 */
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"m" (roffs), /* %10 */
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"m" (goffs), /* %11 */
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"m" (boffs), /* %12 */
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"m" (width), /* %13 */
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"m" (height), /* %14 */
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"m" (line_offset), /* %15 */
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"m" (rrggbbaa.words.rr), /* %16 (access to rr) */
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"m" (rrggbbaa.words.gg), /* %17 (access to gg) */
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"m" (rrggbbaa.words.bb), /* %18 (access to bb) */
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"m" (rrggbbaa.words.aa), /* %19 (access to aa) */
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"m" (pixel.words.rr), /* %20 (access to pixel.r) */
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"m" (pixel.words.gg), /* %21 (access to pixel.g) */
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"m" (pixel.words.bb), /* %22 (access to pixel.b) */
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"m" (pixel.words.aa), /* %23 (access to pixel.a) */
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"m" (tmp_err), /* %24 */
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"m" (tmp_nerr), /* %25 */
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"m" (x), /* %26 */
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"m" (w1), /* %27 */
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"m" (w2) /* %28 */
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:
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"eax",
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"ecx",
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"edx",
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"esi",
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"edi"
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);
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}
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#endif /* ASM_X86_MMX */
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void
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x86_PseudoColor_32_to_8(unsigned char *image,
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unsigned char *ximage,
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char *err,
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char *nerr,
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short *ctable,
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int dr,
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int dg,
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int db,
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unsigned long *pixels, int cpc, int width, int height, int bytesPerPixel, int line_offset)
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{
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int x;
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int cpcpc;
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int rr;
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int gg;
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int bb;
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char *tmp_err;
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char *tmp_nerr;
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char ndr; // aparently not used
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char ndg; // aparently not used
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char ndb; // aparently not used
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asm volatile (
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"pushal \n\t"
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"movl %9, %%eax \n\t"
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"mulb %9 \n\t"
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"movl %%eax, %15 \n\t" /* cpcpc = cpc * cpc */
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/* eax will always be <= 0xffff */
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/* process 1 pixel / cycle, each component treated as 16bit */
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"movl %0, %%esi \n\t" /* esi = image->data */
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".LoopYb: \n\t"
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"movl %10, %%ecx \n\t"
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"movl %%ecx, %14 \n\t" /* x = width */
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"movl %11, %%ecx \n\t"
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"decl %%ecx \n\t" /* y-- */
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"movl %%ecx, %11 \n\t"
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"js .Endb \n\t" /* if y < 0, goto end */
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"andl $1, %%ecx \n\t"
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"jz .LoopY_1b \n\t" /* if (y & 1) goto LoopY_1 */
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".LoopY_0b: \n\t"
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"movl %2, %%ebx \n\t" /* ebx = err */
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/* "movl %%ebx, %20 \n\t" */ /* [-36] = err */ /* useless */
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"movl %3, %%ecx \n\t"
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"movl %%ecx, %19 \n\t" /* [-32] = nerr */
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"movl $0, (%%ecx) \n\t" /* init error of nerr[0] to 0 */
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"jmp .LoopXb \n\t"
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".LoopY_1b: \n\t"
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"movl %3, %%ebx \n\t" /* ebx = nerr */
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/* "movl %%ebx, %20 \n\t" */ /* [-36] = nerr */ /* useless */
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"movl %2, %%ecx \n\t"
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"movl %%ecx, %19 \n\t" /* [-32] = err */
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"movl $0, (%%ecx) \n\t" /* init error of nerr[0] to 0 */
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".align 16 \n\t"
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".LoopXb: \n\t"
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"movl %4, %%edi \n\t" /* edi = ctable */
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"xorl %%edx, %%edx \n\t" /* zero the upper word on edx */
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/* RED; depends on ebx==err, esi==image->data, edi */
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"movzbw (%%esi), %%dx \n\t" /* dx = image->data[0] */
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"movsbw (%%ebx), %%ax \n\t" /* ax = error[0] */
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"addw %%ax, %%dx \n\t" /* pixel.red = data[0] + error[0] */
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"testb %%dh, %%dh \n\t" /* test if pixel.red < 0 or > 255 */
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"jz .OKRb \n\t" /* 0 <= pixel.red <= 255 */
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"js .NEGRb \n\t" /* pixel.red < 0 */
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"movw $0xff, %%dx \n\t" /* pixel.red > 255 */
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"jmp .OKRb \n\t"
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".NEGRb: \n\t"
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"xorw %%dx, %%dx \n\t"
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".OKRb: \n\t"
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/* partial reg */
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"leal (%%edi, %%edx, 2), %%ecx \n\t" /* ecx = &ctable[pixel.red] */
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/* agi */
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"movl (%%ecx), %%eax \n\t" /* ax = ctable[pixel.red] */
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"movw %%ax, %16 \n\t" /* save rr */
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"mulb %5 \n\t" /* ax = rr*dr */
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"subw %%ax, %%dx \n\t" /* rer = dx = dx - rr*dr */
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"movswl %%dx, %%eax \n\t" /* save rer */
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/* distribute error */
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"leal (, %%eax, 8), %%ecx \n\t"
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"subw %%dx, %%cx \n\t" /* cx = rer * 7 */
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"sarw $4, %%cx \n\t" /* cx = rer * 7 / 16 */
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"addb %%cl, 4(%%ebx) \n\t" /* err[x+1] += rer * 7 / 16 */
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"movl %19, %%ecx \n\t" /* ecx = nerr */
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"leaw (%%eax, %%eax, 4), %%dx \n\t" /* dx = rer * 5 */
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"sarw $4, %%dx \n\t" /* dx = rer * 5 / 16 */
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"addb %%dl, (%%ecx) \n\t" /* nerr[x] += rer * 5 / 16 */
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"leaw (%%eax, %%eax, 2), %%dx \n\t" /* dx = rer * 3 */
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"sarw $4, %%dx \n\t" /* dx = rer * 3 / 16 */
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"addb %%dl, -4(%%ecx) \n\t" /* nerr[x-1] += rer * 3 / 16 */
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"sarw $4, %%ax \n\t" /* ax = rer / 16 */
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"movb %%al, 4(%%ecx) \n\t" /* nerr[x+1] = rer / 16 */
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/* GREEN; depends on ebx, esi, edi */
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"movzbw 1(%%esi), %%dx \n\t" /* dx = image->data[1] */
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"movsbw 1(%%ebx), %%ax \n\t" /* ax = error[1] */
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"addw %%ax, %%dx \n\t" /* pixel.grn = data[1] + error[1] */
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"testb %%dh, %%dh \n\t" /* test if pixel.grn < 0 or > 255 */
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"jz .OKGb \n\t" /* 0 <= pixel.grn <= 255 */
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"js .NEGGb \n\t" /* pixel.grn < 0 */
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"movw $0xff, %%dx \n\t" /* pixel.grn > 255 */
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"jmp .OKGb \n\t"
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".NEGGb: \n\t"
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"xorw %%dx, %%dx \n\t"
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".OKGb: \n\t"
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/* partial reg */
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"leal (%%edi, %%edx, 2), %%ecx \n\t" /* ecx = &ctable[pixel.grn] */
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/* agi */
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"movw (%%ecx), %%ax \n\t" /* ax = ctable[pixel.grn] */
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"movw %%ax, %17 \n\t" /* save gg */
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"mulb %6 \n\t" /* ax = gg*dg */
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"subw %%ax, %%dx \n\t" /* ger = dx = dx - gg*dg */
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"movswl %%dx, %%eax \n\t" /* save ger */
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/* distribute error */
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"leal (, %%eax, 8), %%ecx \n\t"
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"subw %%dx, %%cx \n\t" /* cx = ger * 7 */
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"sarw $4, %%cx \n\t" /* cx = ger * 7 / 16 */
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"addb %%cl, 5(%%ebx) \n\t" /* err[x+1] += ger * 7 / 16 */
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"movl %19, %%ecx \n\t" /* ecx = nerr */
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"leaw (%%eax, %%eax, 4), %%dx \n\t" /* dx = ger * 5 */
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"sarw $4, %%dx \n\t" /* dx = ger * 5 / 16 */
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"addb %%dl, 1(%%ecx) \n\t" /* nerr[x] += ger * 5 / 16 */
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"leaw (%%eax, %%eax, 2), %%dx \n\t" /* dx = ger * 3 */
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"sarw $4, %%dx \n\t" /* dx = ger * 3 / 16 */
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"addb %%dl, -3(%%ecx) \n\t" /* nerr[x-1] += ger * 3 / 16 */
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"sarw $4, %%ax \n\t" /* ax = ger / 16 */
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"movb %%al, 5(%%ecx) \n\t" /* nerr[x+1] = ger / 16 */
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/* BLUE; depends on ebx, esi */
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"movzbw 2(%%esi), %%dx \n\t" /* dx = image->data[2] */
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"movsbw 2(%%ebx), %%ax \n\t" /* ax = error[2] */
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"addw %%ax, %%dx \n\t" /* pixel.grn = data[2] + error[2] */
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"testb %%dh, %%dh \n\t" /* test if pixel.blu < 0 or > 255 */
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"jz .OKBb \n\t" /* 0 <= pixel.blu <= 255 */
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"js .NEGBb \n\t" /* pixel.blu < 0 */
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"movw $0xff, %%dx \n\t" /* pixel.blu > 255 */
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"jmp .OKBb \n\t"
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".NEGBb: \n\t"
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"xorw %%dx, %%dx \n\t"
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".OKBb: \n\t"
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/* partial reg */
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"leal (%%edi, %%edx, 2), %%ecx \n\t" /* ecx = &ctable[pixel.blu] */
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/* agi */
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"movw (%%ecx), %%ax \n\t" /* ax = ctable[pixel.blu] */
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"movw %%ax, %18 \n\t" /* save bb */
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"mulb %7 \n\t" /* ax = bb*db */
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"subw %%ax, %%dx \n\t" /* ber = dx = dx - bb*db */
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"movswl %%dx, %%eax \n\t" /* save ber */
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/* distribute error */
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"leal (, %%eax, 8), %%ecx \n\t"
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"subw %%dx, %%cx \n\t" /* cx = ber * 7 */
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"sarw $4, %%cx \n\t" /* cx = ber * 7 / 16 */
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"addb %%cl, 6(%%ebx) \n\t" /* err[x+1] += ber * 7 / 16 */
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"movl %19, %%ecx \n\t" /* ecx = nerr */
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"leaw (%%eax, %%eax, 4), %%dx \n\t" /* dx = ber * 5 */
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"sarw $4, %%dx \n\t" /* dx = ber * 5 / 16 */
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"addb %%dl, 2(%%ecx) \n\t" /* nerr[x] += ber * 5 / 16 */
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"leaw (%%eax, %%eax, 2), %%dx \n\t" /* dx = ber * 3 */
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"sarw $4, %%dx \n\t" /* dx = ber * 3 / 16 */
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"addb %%dl, -4(%%ecx) \n\t" /* nerr[x-1] += ber * 3 / 16 */
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"sarw $4, %%ax \n\t" /* ax = ber / 16 */
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"movb %%al, 6(%%ecx) \n\t" /* nerr[x+1] = ber / 16 */
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"andl $0xffff, %%eax \n\t"
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/* depends on eax & 0xffff0000 == 0
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* calculate the index of the value of the pixel */
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"movw %16, %%ax \n\t" /* ax = rr */
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"mulb %15 \n\t" /* ax = cpcpc*rr */
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"movw %%ax, %%cx \n\t"
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"movw %17, %%ax \n\t" /* ax = gg */
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"mulb %9 \n\t" /* ax = cpc*gg */
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"addw %%cx, %%ax \n\t" /* ax = cpc*gg + cpcpc*rr */
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"addw %18, %%ax \n\t" /* ax = cpcpc*rr + cpc*gg + bb */
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"movl %8, %%ecx \n\t"
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/* agi */
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"leal (%%ecx, %%eax, 4), %%edx \n\t"
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/* agi */
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"movb (%%edx), %%cl \n\t" /* cl = pixels[ax] */
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/* store the pixel */
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"movl %1, %%eax \n\t"
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"movb %%cl, (%%eax) \n\t" /* *ximage = cl */
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"incl %1 \n\t" /* ximage++ */
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/* prepare for next iteration on X */
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"addl $4, %19 \n\t" /* nerr += 4 */
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"addl $4, %%ebx \n\t" /* err += 4 */
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"addl %12, %%esi \n\t" /* image->data += bpp */
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"decl %14 \n\t" /* x-- */
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"jnz .LoopXb \n\t" /* if x>0, goto .LoopX */
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"movl %13, %%eax \n\t"
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"addl %%eax, %1 \n\t" /* add extra offset to ximage */
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"jmp .LoopYb \n\t"
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".Endb: \n\t"
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"emms \n\t"
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"popal \n\t"
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:
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: "m" (image), /* %0 */
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"m" (ximage), /* %1 */
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"m" (err), /* %2 */
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"m" (nerr), /* %3 */
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"m" (ctable), /* %4 */
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"m" (dr), /* %5 */
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"m" (dg), /* %6 */
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"m" (db), /* %7 */
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"m" (pixels), /* %8 */
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"m" (cpc), /* %9 */
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"m" (width), /* %10 */
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"m" (height), /* %11 */
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"m" (bytesPerPixel), /* %12 */
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"m" (line_offset), /* %13 */
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"m" (x), /* %14 */
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"m" (cpcpc), /* %15 */
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"m" (rr), /* %16 */
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"m" (gg), /* %17 */
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"m" (bb), /* %18 */
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"m" (tmp_err), /* %19 */
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"m" (tmp_nerr), /* %20 */
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"m" (ndr), /* %21 */
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"m" (ndg), /* %22 */
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"m" (ndb) /* %23 */
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);
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}
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#endif /* ASM_X86 */
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