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Change to the linux kernel coding style
[wmaker-crm.git] / wrlib / x86_specific.c
blob9cbbf47a764dab39112d9a48a34ecd30c885e300
1 /* x86_convert.c - convert RImage to XImage with x86 optimizations
2 *
3 * Raster graphics library
4 *
5 * Copyright (c) 2000-2003 Alfredo K. Kojima
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the Free
19 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include <config.h>
23
24 #ifdef ASM_X86
25
26 #ifdef ASM_X86_MMX
27
28 int x86_check_mmx()
29 {
30 static int result = -1;
31
32 if (result >= 0)
33 return result;
34
35 result = 0;
36
37 asm volatile
38 ("pushal \n\t" // please dont forget this in any asm
39 "pushfl \n\t" // check whether cpuid supported
40 "pop %%eax \n\t" "movl %%eax, %%ebx \n\t" "xorl $(1<<21), %%eax \n\t" "pushl %%eax \n\t" "popfl \n\t" "pushfl \n\t" "popl %%eax \n\t" "xorl %%ebx, %%eax \n\t" "andl $(1<<21), %%eax \n\t" "jz .NotPentium \n\t" "xorl %%eax, %%eax \n\t" // no eax effect because of the movl below
41 // except reseting flags. is it needed?
42 "movl $1, %%eax \n\t" "cpuid \n\t" "test $(1<<23), %%edx \n\t" "jz .NotMMX \n\t" "popal \n\t" // popal needed because the address of
43 "movl $1, %0 \n\t" // variable %0 may be kept in a register
44 "jmp .noPop \n"
45 ".NotMMX: \n"
46 ".NotPentium: \n\t"
47 "popal \n" ".noPop: \n\t":"=m" (result));
48
49 return result;
50 }
51
52 /*
53 * TODO:
54 * 32/8 24/8 32/16 24/16 32/24 24/24
55 * PPlain YES YES
56 * MMX DONE
57 *
58 *
59 * - try to align stack (local variable space) into quadword boundary
60 */
61 void
62 x86_mmx_TrueColor_32_to_16(unsigned char *image,
63 unsigned short *ximage,
64 short *err,
65 short *nerr,
66 unsigned short *rtable,
67 unsigned short *gtable,
68 unsigned short *btable,
69 int dr,
70 int dg,
71 int db,
72 unsigned int roffs,
73 unsigned int goffs, unsigned int boffs, int width, int height, int line_offset)
74 {
75 union {
76 long long rrggbbaa;
77 struct {
78 short int rr, gg, bb, aa;
79 } words;
80 } rrggbbaa;
81
82 union {
83 long long pixel;
84 struct {
85 short int rr, gg, bb, aa;
86 } words;
87 } pixel;
88
89 short *tmp_err;
90 short *tmp_nerr;
91 int x;
92
93 asm volatile
94 ("pushl %%ebx \n\t"
95 // pack dr, dg and db into mm6
96 "movl %7, %%eax \n\t" "movl %8, %%ebx \n\t" "movl %9, %%ecx \n\t" "movw %%ax, %16 \n\t" "movw %%bx, %17 \n\t" "movw %%cx, %18 \n\t" "movw $0, %19 \n\t" "movq %16, %%mm6 \n\t" // dr dg db 0
97 // pack 4|4|4|4 into mm7, for shifting (/16)
98 "movl $0x00040004, %16 \n\t"
99 "movl $0x00040004, %18 \n\t" "movq %16, %%mm7 \n\t"
100 // store constant values for using with mmx when dithering
101 "movl $0x00070007, %16 \n\t"
102 "movl $0x00070007, %18 \n\t"
103 "movq %16, %%mm5 \n\t"
104 "movl $0x00050005, %16 \n\t"
105 "movl $0x00050005, %18 \n\t"
106 "movq %16, %%mm4 \n\t"
107 "movl $0x00030003, %16 \n\t"
108 "movl $0x00030003, %18 \n\t" "movq %16, %%mm3 \n\t"
109 // process 1 pixel / cycle, each component treated as 16bit
110 "movl %0, %%esi \n" // esi = image->data
111 ".LoopYa: \n\t" "movl %13, %%eax \n\t" "movl %%eax, %26 \n\t" // x = width
112 "movl %14, %%eax \n\t" "decl %%eax \n\t" // y--
113 "movl %%eax, %14 \n\t" "js .Enda \n\t" // if y < 0, goto end
114 "andl $1, %%eax \n\t" "jz .LoopY_1a \n" // if (y&1) goto LoopY_1
115 ".LoopY_0a: \n\t" "movl %2, %%ebx \n\t" // ebx = err
116 "movl %%ebx, %25 \n\t" // [-36] = err
117 "movl %3, %%eax \n\t" //
118 "movl %%eax, %24 \n\t" // [-32] = nerr
119 "jmp .LoopXa \n" ".LoopY_1a: \n\t" "movl %3, %%ebx \n\t" // ebx = nerr
120 "movl %%ebx, %25 \n\t" // [-36] = nerr
121 "movl %2, %%eax \n\t" //
122 "movl %%eax, %24 \n\t" // [-32] = eerr
123 ".align 16 \n" ".LoopXa: \n\t"
124 // calculate errors and pixel components
125 // depend on ebx, esi, mm6
126 "movq (%%ebx), %%mm1 \n\t" // mm1 = error[0..3]
127 "punpcklbw (%%esi), %%mm0 \n\t" // mm0 = image->data[0..3]
128 "psrlw $8, %%mm0 \n\t" // fixup mm0
129 "paddusb %%mm1, %%mm0 \n\t" // mm0 = mm0 + mm1 (sat. to 255)
130 "movq %%mm0, %20 \n\t" // save the pixel
131 "movzwl %20, %%ecx \n\t" // ecx = pixel.red
132 "movl %4, %%edi \n\t" // edi = rtable
133 //agi
134 "leal (%%edi, %%ecx, 2), %%eax \n\t" // eax = &rtable[pixel.red]
135 // agi
136 "movw (%%eax), %%dx \n\t" // dx = rtable[pixel.red]
137 "movw %%dx, %16 \n\t" // save rr
138 "movzwl %21, %%ecx \n\t" // ecx = pixel.green
139 "movl %5, %%edi \n\t" // edi = gtable
140 //agi
141 "leal (%%edi, %%ecx, 2), %%eax \n\t" // eax = &gtable[pixel.green]
142 //agi
143 "movw (%%eax), %%dx \n\t" // dx = gtable[pixel.green]
144 "movw %%dx, %17 \n\t" // save gg
145 "movzwl %22, %%ecx \n\t" // ecx = pixel.blue
146 "movl %6, %%edi \n\t" // ebx = btable
147 //agi
148 "leal (%%edi, %%ecx, 2), %%eax \n\t" // eax = &btable[pixel.blue]
149 //agi
150 "movw (%%eax), %%dx \n\t" // dx = btable[pixel.blue]
151 "movw %%dx, %18 \n\t" // save bb
152 "movw $0, %19 \n\t" // save dummy aa
153 "movq %16, %%mm1 \n\t" // load mm1 with rrggbbaa
154 "pmullw %%mm6, %%mm1 \n\t" // mm1 = rr*dr|...
155 "psubsw %%mm1, %%mm0 \n\t" // error = pixel - mm1
156 // distribute the error
157 // depend on mm0, mm7, mm3, mm4, mm5
158 "movl %25, %%ebx \n\t" "movq %%mm0, %%mm1 \n\t" "pmullw %%mm5, %%mm1 \n\t" // mm1 = mm1*7
159 "psrlw %%mm7, %%mm1 \n\t" // mm1 = mm1/16
160 "paddw 8(%%ebx), %%mm1 \n\t" "movq %%mm1, 8(%%ebx) \n\t" // err[x+1,y] = rer*7/16
161 "movl %24, %%ebx \n\t" "movq %%mm0, %%mm1 \n\t" "pmullw %%mm4, %%mm1 \n\t" // mm1 = mm1*5
162 "psrlw %%mm7, %%mm1 \n\t" // mm1 = mm1/16
163 "paddw -8(%%ebx), %%mm1 \n\t" "movq %%mm1, -8(%%ebx) \n\t" // err[x-1,y+1] += rer*3/16
164 "movq %%mm0, %%mm1 \n\t" "pmullw %%mm3, %%mm1 \n\t" // mm1 = mm1*3
165 "psrlw %%mm7, %%mm1 \n\t" // mm1 = mm1/16
166 "paddw 8(%%ebx), %%mm1 \n\t" "movq %%mm1, (%%ebx) \n\t" // err[x,y+1] += rer*5/16
167 "psrlw %%mm7, %%mm0 \n\t" // mm0 = mm0/16
168 "movq %%mm0, 8(%%ebx) \n\t" // err[x+1,y+1] = rer/16
169 // calculate final pixel value and store
170 "movl %10, %%ecx \n\t" "movw %16, %%ax \n\t" "shlw %%cl, %%ax \n\t" //NP* ax = r<<roffs
171 "movl %11, %%ecx \n\t" "movw %17, %%bx \n\t" "shlw %%cl, %%bx \n\t" //NP*
172 "orw %%bx, %%ax \n\t" "movl %12, %%ecx \n\t" "movw %18, %%bx \n\t" "shlw %%cl, %%bx \n\t" //NP*
173 "orw %%bx, %%ax \n\t" "movl %1, %%edx \n\t" "movw %%ax, (%%edx) \n\t" "addl $2, %%edx \n\t" // increment ximage
174 "movl %%edx, %1 \n\t"
175 // prepare for next iteration on X
176 "addl $8, %24 \n\t" // nerr += 8
177 "movl %25, %%ebx \n\t" "addl $8, %%ebx \n\t" "movl %%ebx, %25 \n\t" // ebx = err += 8
178 // Note: in the last pixel, this would cause an invalid memory access
179 // because, punpcklbw is used (which reads 8 bytes) and the last
180 // pixel is only 4 bytes. This is no problem because the image data
181 // was allocated with extra 4 bytes when created.
182 "addl $4, %%esi \n\t" // image->data += 4
183 "decl %26 \n\t" // x--
184 "jnz .LoopXa \n\t" // if x>0, goto .LoopX
185 // depend on edx
186 "addl %15, %%edx \n\t" // add extra offset to ximage
187 "movl %%edx, %1 \n\t" "jmp .LoopYa \n" ".Enda: \n\t" // THE END
188 "emms \n\t" "popl %%ebx \n\t":: "m" (image), // %0
189 "m"(ximage), // %1
190 "m"(err), // %2
191 "m"(nerr), // %3
192 "m"(rtable), // %4
193 "m"(gtable), // %5
194 "m"(btable), // %6
195 "m"(dr), // %7
196 "m"(dg), // %8
197 "m"(db), // %9
198 "m"(roffs), // %10
199 "m"(goffs), // %11
200 "m"(boffs), // %12
201 "m"(width), // %13
202 "m"(height), // %14
203 "m"(line_offset), // %15
204 "m"(rrggbbaa.words.rr), // %16 (access to rr)
205 "m"(rrggbbaa.words.gg), // %17 (access to gg)
206 "m"(rrggbbaa.words.bb), // %18 (access to bb)
207 "m"(rrggbbaa.words.aa), // %19 (access to aa)
208 "m"(pixel.words.rr), // %20 (access to pixel.r)
209 "m"(pixel.words.gg), // %21 (access to pixel.g)
210 "m"(pixel.words.bb), // %22 (access to pixel.b)
211 "m"(pixel.words.aa), // %23 (access to pixel.a)
212 "m"(tmp_err), // %24
213 "m"(tmp_nerr), // %25
214 "m"(x) // %26
215 :"eax", "ecx", "edx", "esi", "edi");
216 }
217
218 void
219 x86_mmx_TrueColor_24_to_16(unsigned char *image,
220 unsigned short *ximage,
221 short *err,
222 short *nerr,
223 short *rtable,
224 short *gtable,
225 short *btable,
226 int dr,
227 int dg,
228 int db,
229 unsigned int roffs,
230 unsigned int goffs, unsigned int boffs, int width, int height, int line_offset)
231 {
232 union {
233 long long rrggbbaa;
234 struct {
235 short int rr, gg, bb, aa;
236 } words;
237 } rrggbbaa;
238
239 union {
240 long long pixel;
241 struct {
242 short int rr, gg, bb, aa;
243 } words;
244 } pixel;
245
246 short *tmp_err;
247 short *tmp_nerr;
248
249 int x;
250 int w1;
251 int w2;
252
253 asm volatile
254 ("pushl %%ebx \n\t" "movl %13, %%eax \n\t" // eax = width
255 "movl %%eax, %%ebx \n\t" "shrl $2, %%eax \n\t" "movl %%eax, %27 \n\t" // w1 = width / 4
256 "andl $3, %%ebx \n\t" "movl %%ebx, %28 \n" // w2 = width %% 4
257 ".LoopYc: \n\t" "movl %13, %%eax \n\t" "movl %%eax, %26 \n\t" // x = width
258 "decl %14 \n\t" // height--
259 "js .Endc \n\t" // if height < 0 then end
260 "movl %14, %%eax \n\t" "decl %%eax \n\t" // y--
261 "movl %%eax, %14 \n\t" "js .Endc \n\t" // if y < 0, goto end
262 "andl $1, %%eax \n\t" "jz .LoopY_1c \n" // if (y&1) goto LoopY_1
263 ".LoopY_0c: \n\t" "movl %2, %%ebx \n\t" // ebx = err
264 "movl %%ebx, %25 \n\t" // [-36] = err
265 "movl %3, %%eax \n\t" //
266 "movl %%eax, %24 \n\t" // [-32] = nerr
267 "jmp .LoopX_1c \n" ".LoopY_1c: \n\t" "movl %3, %%ebx \n\t" // ebx = nerr
268 "movl %%ebx, %25 \n\t" // [-36] = nerr
269 "movl %2, %%eax \n\t" //
270 "movl %%eax, %24 \n\t" // [-32] = eerr
271 ".align 16 \n\t" "movl %%eax, %26 \n" // x = w1
272 ".LoopX_1c: \n\t" "decl %26 \n\t" // x--
273 "js .Xend1_c \n\t" // if x < 0 then end
274 // do conversion of 4 pixels
275 "movq %2, %%mm0 \n\t" // mm0 = err
276 "jmp .LoopX_1c \n" ".Xend1_c: \n\t" "movl %28, %%eax \n\t" "movl %%eax, %26 \n" // x = w2
277 ".LoopX_2c: \n\t" "decl %26 \n\t" // x--
278 "js .Xend2_c \n\t" //
279 // do conversion
280 "jmp .LoopX_2c \n" ".Xend2_c: \n\t" "movl %27, %%eax \n\t" "jmp .LoopYc \n" ".Endc: \n\t" // THE END
281 "emms \n\t" "popl %%ebx \n\t":: "m" (image), // %0
282 "m"(ximage), // %1
283 "m"(err), // %2
284 "m"(nerr), // %3
285 "m"(rtable), // %4
286 "m"(gtable), // %5
287 "m"(btable), // %6
288 "m"(dr), // %7
289 "m"(dg), // %8
290 "m"(db), // %9
291 "m"(roffs), // %10
292 "m"(goffs), // %11
293 "m"(boffs), // %12
294 "m"(width), // %13
295 "m"(height), // %14
296 "m"(line_offset), // %15
297 "m"(rrggbbaa.words.rr), // %16 (access to rr)
298 "m"(rrggbbaa.words.gg), // %17 (access to gg)
299 "m"(rrggbbaa.words.bb), // %18 (access to bb)
300 "m"(rrggbbaa.words.aa), // %19 (access to aa)
301 "m"(pixel.words.rr), // %20 (access to pixel.r)
302 "m"(pixel.words.gg), // %21 (access to pixel.g)
303 "m"(pixel.words.bb), // %22 (access to pixel.b)
304 "m"(pixel.words.aa), // %23 (access to pixel.a)
305 "m"(tmp_err), // %24
306 "m"(tmp_nerr), // %25
307 "m"(x), // %26
308 "m"(w1), // %27
309 "m"(w2) // %28
310 :"eax", "ecx", "edx", "esi", "edi");
311 }
312
313 #endif /* ASM_X86_MMX */
314
315 void
316 x86_PseudoColor_32_to_8(unsigned char *image,
317 unsigned char *ximage,
318 char *err,
319 char *nerr,
320 short *ctable,
321 int dr,
322 int dg,
323 int db,
324 unsigned long *pixels, int cpc, int width, int height, int bytesPerPixel, int line_offset)
325 {
326 int x;
327 int cpcpc;
328
329 int rr;
330 int gg;
331 int bb;
332
333 char *tmp_err;
334 char *tmp_nerr;
335
336 char ndr; // aparently not used
337 char ndg; // aparently not used
338 char ndb; // aparently not used
339
340 asm volatile
341 ("pushal \n\t" "movl %9, %%eax \n\t" "mulb %9 \n\t" "movl %%eax, %15 \n\t" // cpcpc = cpc*cpc
342 // eax will always be <= 0xffff
343 // process 1 pixel / cycle, each component treated as 16bit
344 "movl %0, %%esi \n" // esi = image->data
345 ".LoopYb: \n\t" "movl %10, %%ecx \n\t" "movl %%ecx, %14 \n\t" // x = width
346 "movl %11, %%ecx \n\t" "decl %%ecx \n\t" // y--
347 "movl %%ecx, %11 \n\t" "js .Endb \n\t" // if y < 0, goto end
348 "andl $1, %%ecx \n\t" "jz .LoopY_1b \n" // if (y&1) goto LoopY_1
349 ".LoopY_0b: \n\t" "movl %2, %%ebx \n\t" // ebx = err
350 //useless "movl %%ebx, %20 \n\t" // [-36] = err
351 "movl %3, %%ecx \n\t" //
352 "movl %%ecx, %19 \n\t" // [-32] = nerr
353 "movl $0, (%%ecx) \n\t" // init error of nerr[0] to 0
354 "jmp .LoopXb \n" ".LoopY_1b: \n\t" "movl %3, %%ebx \n\t" // ebx = nerr
355 //useless "movl %%ebx, %20 \n\t" // [-36] = nerr
356 "movl %2, %%ecx \n\t" //
357 "movl %%ecx, %19 \n\t" // [-32] = err
358 "movl $0, (%%ecx) \n\t" // init error of nerr[0] to 0
359 ".align 16 \n" ".LoopXb: \n\t" "movl %4, %%edi \n\t" // edi = ctable
360 "xorl %%edx, %%edx \n\t" // zero the upper word on edx
361 // RED
362 // depends on ebx==err, esi==image->data, edi
363 "movzbw (%%esi), %%dx \n\t" // dx = image->data[0]
364 "movsbw (%%ebx), %%ax \n\t" // ax = error[0]
365 "addw %%ax, %%dx \n\t" // pixel.red = data[0] + error[0]
366 "testb %%dh, %%dh \n\t" // test if pixel.red < 0 or > 255
367 "jz .OKRb \n\t" // 0 <= pixel.red <= 255
368 "js .NEGRb \n\t" // pixel.red < 0
369 "movw $0xff, %%dx \n\t" // pixel.red > 255
370 "jmp .OKRb \n"
371 ".NEGRb: \n\t"
372 "xorw %%dx, %%dx \n" ".OKRb: \n\t"
373 //partial reg
374 "leal (%%edi, %%edx, 2), %%ecx \n\t" // ecx = &ctable[pixel.red]
375 //agi
376 "movl (%%ecx), %%eax \n\t" // ax = ctable[pixel.red]
377 "movw %%ax, %16 \n\t" // save rr
378 "mulb %5 \n\t" // ax = rr*dr
379 "subw %%ax, %%dx \n\t" // rer = dx = dx - rr*dr
380 "movswl %%dx, %%eax \n\t" // save rer
381 // distribute error
382 "leal (, %%eax, 8), %%ecx \n\t" "subw %%dx, %%cx \n\t" // cx = rer * 7
383 "sarw $4, %%cx \n\t" // cx = rer * 7 / 16
384 "addb %%cl, 4(%%ebx) \n\t" // err[x+1] += rer * 7 / 16
385 "movl %19, %%ecx \n\t" // ecx = nerr
386 "leaw (%%eax, %%eax, 4), %%dx \n\t" // dx = rer * 5
387 "sarw $4, %%dx \n\t" // dx = rer * 5 / 16
388 "addb %%dl, (%%ecx) \n\t" // nerr[x] += rer * 5 / 16
389 "leaw (%%eax, %%eax, 2), %%dx \n\t" // dx = rer * 3
390 "sarw $4, %%dx \n\t" // dx = rer * 3 / 16
391 "addb %%dl, -4(%%ecx) \n\t" // nerr[x-1] += rer * 3 / 16
392 "sarw $4, %%ax \n\t" // ax = rer / 16
393 "movb %%al, 4(%%ecx) \n\t" // nerr[x+1] = rer / 16
394 // GREEN
395 // depends on ebx, esi, edi
396 "movzbw 1(%%esi), %%dx \n\t" // dx = image->data[1]
397 "movsbw 1(%%ebx), %%ax \n\t" // ax = error[1]
398 "addw %%ax, %%dx \n\t" // pixel.grn = data[1] + error[1]
399 "testb %%dh, %%dh \n\t" // test if pixel.grn < 0 or > 255
400 "jz .OKGb \n\t" // 0 <= pixel.grn <= 255
401 "js .NEGGb \n\t" // pixel.grn < 0
402 "movw $0xff, %%dx \n\t" // pixel.grn > 255
403 "jmp .OKGb \n"
404 ".NEGGb: \n\t"
405 "xorw %%dx, %%dx \n" ".OKGb: \n\t"
406 // partial reg
407 "leal (%%edi, %%edx, 2), %%ecx \n\t" // ecx = &ctable[pixel.grn]
408 //agi
409 "movw (%%ecx), %%ax \n\t" // ax = ctable[pixel.grn]
410 "movw %%ax, %17 \n\t" // save gg
411 "mulb %6 \n\t" // ax = gg*dg
412 "subw %%ax, %%dx \n\t" // ger = dx = dx - gg*dg
413 "movswl %%dx, %%eax \n\t" // save ger
414 // distribute error
415 "leal (, %%eax, 8), %%ecx \n\t" "subw %%dx, %%cx \n\t" // cx = ger * 7
416 "sarw $4, %%cx \n\t" // cx = ger * 7 / 16
417 "addb %%cl, 5(%%ebx) \n\t" // err[x+1] += ger * 7 / 16
418 "movl %19, %%ecx \n\t" // ecx = nerr
419 "leaw (%%eax, %%eax, 4), %%dx \n\t" // dx = ger * 5
420 "sarw $4, %%dx \n\t" // dx = ger * 5 / 16
421 "addb %%dl, 1(%%ecx) \n\t" // nerr[x] += ger * 5 / 16
422 "leaw (%%eax, %%eax, 2), %%dx \n\t" // dx = ger * 3
423 "sarw $4, %%dx \n\t" // dx = ger * 3 / 16
424 "addb %%dl, -3(%%ecx) \n\t" // nerr[x-1] += ger * 3 / 16
425 "sarw $4, %%ax \n\t" // ax = ger / 16
426 "movb %%al, 5(%%ecx) \n\t" // nerr[x+1] = ger / 16
427 // BLUE
428 // depends on ebx, esi
429 "movzbw 2(%%esi), %%dx \n\t" // dx = image->data[2]
430 "movsbw 2(%%ebx), %%ax \n\t" // ax = error[2]
431 "addw %%ax, %%dx \n\t" // pixel.grn = data[2] + error[2]
432 "testb %%dh, %%dh \n\t" // test if pixel.blu < 0 or > 255
433 "jz .OKBb \n\t" // 0 <= pixel.blu <= 255
434 "js .NEGBb \n\t" // pixel.blu < 0
435 "movw $0xff, %%dx \n\t" // pixel.blu > 255
436 "jmp .OKBb \n"
437 ".NEGBb: \n\t"
438 "xorw %%dx, %%dx \n" ".OKBb: \n\t"
439 //partial reg
440 "leal (%%edi, %%edx, 2), %%ecx \n\t" // ecx = &ctable[pixel.blu]
441 //agi
442 "movw (%%ecx), %%ax \n\t" // ax = ctable[pixel.blu]
443 "movw %%ax, %18 \n\t" // save bb
444 "mulb %7 \n\t" // ax = bb*db
445 "subw %%ax, %%dx \n\t" // ber = dx = dx - bb*db
446 "movswl %%dx, %%eax \n\t" // save ber
447 // distribute error
448 "leal (, %%eax, 8), %%ecx \n\t" "subw %%dx, %%cx \n\t" // cx = ber * 7
449 "sarw $4, %%cx \n\t" // cx = ber * 7 / 16
450 "addb %%cl, 6(%%ebx) \n\t" // err[x+1] += ber * 7 / 16
451 "movl %19, %%ecx \n\t" // ecx = nerr
452 "leaw (%%eax, %%eax, 4), %%dx \n\t" // dx = ber * 5
453 "sarw $4, %%dx \n\t" // dx = ber * 5 / 16
454 "addb %%dl, 2(%%ecx) \n\t" // nerr[x] += ber * 5 / 16
455 "leaw (%%eax, %%eax, 2), %%dx \n\t" // dx = ber * 3
456 "sarw $4, %%dx \n\t" // dx = ber * 3 / 16
457 "addb %%dl, -4(%%ecx) \n\t" // nerr[x-1] += ber * 3 / 16
458 "sarw $4, %%ax \n\t" // ax = ber / 16
459 "movb %%al, 6(%%ecx) \n\t" // nerr[x+1] = ber / 16
460 "andl $0xffff, %%eax \n\t"
461 // depends on eax & 0xffff0000 == 0
462 // calculate the index of the value of the pixel
463 "movw %16, %%ax \n\t" // ax = rr
464 "mulb %15 \n\t" // ax = cpcpc*rr
465 "movw %%ax, %%cx \n\t" "movw %17, %%ax \n\t" // ax = gg
466 "mulb %9 \n\t" // ax = cpc*gg
467 "addw %%cx, %%ax \n\t" // ax = cpc*gg + cpcpc*rr
468 "addw %18, %%ax \n\t" // ax = cpcpc*rr + cpc*gg + bb
469 "movl %8, %%ecx \n\t"
470 //agi
471 "leal (%%ecx, %%eax, 4), %%edx \n\t"
472 //agi
473 "movb (%%edx), %%cl \n\t" // cl = pixels[ax]
474 // store the pixel
475 "movl %1, %%eax \n\t" "movb %%cl, (%%eax) \n\t" // *ximage = cl
476 "incl %1 \n\t" // ximage++
477 // prepare for next iteration on X
478 "addl $4, %19 \n\t" // nerr += 4
479 "addl $4, %%ebx \n\t" // err += 4
480 "addl %12, %%esi \n\t" // image->data += bpp
481 "decl %14 \n\t" // x--
482 "jnz .LoopXb \n\t" // if x>0, goto .LoopX
483 "movl %13, %%eax \n\t" "addl %%eax, %1 \n\t" // add extra offset to ximage
484 "jmp .LoopYb \n" ".Endb: \n\t" "emms \n\t" "popal \n\t":: "m" (image), // %0
485 "m"(ximage), // %1
486 "m"(err), // %2
487 "m"(nerr), // %3
488 "m"(ctable), // %4
489 "m"(dr), // %5
490 "m"(dg), // %6
491 "m"(db), // %7
492 "m"(pixels), // %8
493 "m"(cpc), // %9
494 "m"(width), // %10
495 "m"(height), // %11
496 "m"(bytesPerPixel), // %12
497 "m"(line_offset), // %13
498 "m"(x), // %14
499 "m"(cpcpc), // %15
500 "m"(rr), // %16
501 "m"(gg), // %17
502 "m"(bb), // %18
503 "m"(tmp_err), // %19
504 "m"(tmp_nerr), // %20
505 "m"(ndr), // %21
506 "m"(ndg), // %22
507 "m"(ndb) // %23
508 );
509 }
510
511 #endif /* ASM_X86 */
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