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3b7d6b60 WJ |
1 | /* Copyright (C) 1989, 1992 Aladdin Enterprises. All rights reserved. |
2 | Distributed by Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of Ghostscript. | |
5 | ||
6 | Ghostscript is distributed in the hope that it will be useful, but | |
7 | WITHOUT ANY WARRANTY. No author or distributor accepts responsibility | |
8 | to anyone for the consequences of using it or for whether it serves any | |
9 | particular purpose or works at all, unless he says so in writing. Refer | |
10 | to the Ghostscript General Public License for full details. | |
11 | ||
12 | Everyone is granted permission to copy, modify and redistribute | |
13 | Ghostscript, but only under the conditions described in the Ghostscript | |
14 | General Public License. A copy of this license is supposed to have been | |
15 | given to you along with Ghostscript so you can know your rights and | |
16 | responsibilities. It should be in a file named COPYING. Among other | |
17 | things, the copyright notice and this notice must be preserved on all | |
18 | copies. */ | |
19 | ||
20 | /* gdevmem2.c */ | |
21 | /* 8-and-more-bit-per-pixel "memory" (stored bitmap) devices */ | |
22 | /* for Ghostscript library. */ | |
23 | #include "memory_.h" | |
24 | #include "gs.h" | |
25 | #include "gxdevice.h" | |
26 | #include "gxdevmem.h" /* semi-public definitions */ | |
27 | #include "gdevmem.h" /* private definitions */ | |
28 | ||
29 | /* ------ Generic procedures ------ */ | |
30 | ||
31 | /* Copy a rectangle of bytes from a source to a destination. */ | |
32 | #undef chunk | |
33 | #define chunk byte | |
34 | private int | |
35 | copy_byte_rect(gx_device_memory *dev, const byte *source, int sraster, | |
36 | int offset, int y, int byte_count, int h) | |
37 | { uint draster = dev->raster; | |
38 | byte *dest = scan_line_base(dev, y) + offset; | |
39 | while ( h-- > 0 ) | |
40 | { memcpy(dest, source, byte_count); | |
41 | source += sraster; | |
42 | dest += draster; | |
43 | } | |
44 | return 0; | |
45 | } | |
46 | ||
47 | /* Map a r-g-b color to a color index. */ | |
48 | /* This requires searching the palette. */ | |
49 | gx_color_index | |
50 | mem_mapped_map_rgb_color(gx_device *dev, gx_color_value r, gx_color_value g, | |
51 | gx_color_value b) | |
52 | { byte br = gx_color_value_to_byte(r); | |
53 | byte bg = gx_color_value_to_byte(g); | |
54 | byte bb = gx_color_value_to_byte(b); | |
55 | register byte *pptr = mdev->palette; | |
56 | int cnt = mdev->palette_size; | |
57 | byte *which; | |
58 | int best = 256*3; | |
59 | while ( cnt-- > 0 ) | |
60 | { register int diff = *pptr - br; | |
61 | if ( diff < 0 ) diff = -diff; | |
62 | if ( diff < best ) /* quick rejection */ | |
63 | { int dg = pptr[1] - bg; | |
64 | if ( dg < 0 ) dg = -dg; | |
65 | if ( (diff += dg) < best ) /* quick rejection */ | |
66 | { int db = pptr[2] - bb; | |
67 | if ( db < 0 ) db = -db; | |
68 | if ( (diff += db) < best ) | |
69 | which = pptr, best = diff; | |
70 | } | |
71 | } | |
72 | pptr += 3; | |
73 | } | |
74 | return (gx_color_index)((which - mdev->palette) / 3); | |
75 | } | |
76 | ||
77 | /* Map a color index to a r-g-b color. */ | |
78 | int | |
79 | mem_mapped_map_color_rgb(gx_device *dev, gx_color_index color, | |
80 | gx_color_value prgb[3]) | |
81 | { byte *pptr = mdev->palette + (int)color * 3; | |
82 | prgb[0] = gx_color_value_from_byte(pptr[0]); | |
83 | prgb[1] = gx_color_value_from_byte(pptr[1]); | |
84 | prgb[2] = gx_color_value_from_byte(pptr[2]); | |
85 | return 0; | |
86 | } | |
87 | ||
88 | /* ------ Mapped 8-bit color ------ */ | |
89 | ||
90 | /* Procedures */ | |
91 | declare_mem_procs(mem_mapped8_copy_mono, mem_mapped8_copy_color, mem_mapped8_fill_rectangle); | |
92 | ||
93 | /* The device descriptor. */ | |
94 | private gx_device_procs mem_mapped8_procs = | |
95 | mem_procs(mem_mapped_map_rgb_color, mem_mapped_map_color_rgb, | |
96 | mem_mapped8_copy_mono, mem_mapped8_copy_color, mem_mapped8_fill_rectangle); | |
97 | ||
98 | /* The instance is public. */ | |
99 | gx_device_memory mem_mapped8_color_device = | |
100 | mem_device("image(8)", 8, mem_mapped8_procs); | |
101 | ||
102 | /* Convert x coordinate to byte offset in scan line. */ | |
103 | #undef x_to_byte | |
104 | #define x_to_byte(x) (x) | |
105 | ||
106 | /* Fill a rectangle with a color. */ | |
107 | private int | |
108 | mem_mapped8_fill_rectangle(gx_device *dev, | |
109 | int x, int y, int w, int h, gx_color_index color) | |
110 | { declare_scan_ptr(dest); | |
111 | check_rect(); | |
112 | setup_rect(dest); | |
113 | while ( h-- > 0 ) | |
114 | { memset(dest, (byte)color, w); | |
115 | inc_chunk_ptr(dest, draster); | |
116 | } | |
117 | return 0; | |
118 | } | |
119 | ||
120 | /* Copy a monochrome bitmap. */ | |
121 | private int | |
122 | mem_mapped8_copy_mono(gx_device *dev, | |
123 | byte *base, int sourcex, int sraster, gx_bitmap_id id, | |
124 | int x, int y, int w, int h, gx_color_index zero, gx_color_index one) | |
125 | { byte *line; | |
126 | int first_bit; | |
127 | declare_scan_ptr(dest); | |
128 | check_rect(); | |
129 | setup_rect(dest); | |
130 | line = base + (sourcex >> 3); | |
131 | first_bit = 0x80 >> (sourcex & 7); | |
132 | while ( h-- > 0 ) | |
133 | { register byte *pptr = dest; | |
134 | byte *sptr = line; | |
135 | register int sbyte = *sptr; | |
136 | register uint bit = first_bit; | |
137 | int count = w; | |
138 | #define is_color(c) ((int)(c) != (int)gx_no_color_index) | |
139 | #define next_bit()\ | |
140 | if ( (bit >>= 1) == 0 ) bit = 0x80, sbyte = *++sptr;\ | |
141 | pptr++ | |
142 | if ( is_color(one) ) | |
143 | { if ( is_color(zero) ) | |
144 | { /* Optimize halftone coloring */ | |
145 | do | |
146 | { *pptr = (sbyte & bit ? (byte)one : | |
147 | (byte)zero); | |
148 | next_bit(); | |
149 | } | |
150 | while ( --count > 0 ); | |
151 | } | |
152 | else | |
153 | { /* Optimize stenciling */ | |
154 | do | |
155 | { if ( sbyte & bit ) | |
156 | *pptr = (byte)one; | |
157 | next_bit(); | |
158 | } | |
159 | while ( --count > 0 ); | |
160 | } | |
161 | } | |
162 | else if ( is_color(zero) ) | |
163 | { do | |
164 | { if ( !(sbyte & bit) ) | |
165 | *pptr = (byte)zero; | |
166 | next_bit(); | |
167 | } | |
168 | while ( --count > 0 ); | |
169 | } | |
170 | #undef next_bit | |
171 | #undef is_color | |
172 | line += sraster; | |
173 | inc_chunk_ptr(dest, draster); | |
174 | } | |
175 | return 0; | |
176 | } | |
177 | ||
178 | /* Copy a color bitmap. */ | |
179 | private int | |
180 | mem_mapped8_copy_color(gx_device *dev, | |
181 | byte *base, int sourcex, int sraster, gx_bitmap_id id, | |
182 | int x, int y, int w, int h) | |
183 | { check_rect(); | |
184 | return copy_byte_rect(mdev, base + x_to_byte(sourcex), sraster, | |
185 | x_to_byte(x), y, x_to_byte(w), h); | |
186 | } | |
187 | ||
188 | /* ------ 16-bit true color ------ */ | |
189 | /* The 16 bits are divided 5 for red, 6 for green, and 5 for blue. */ | |
190 | ||
191 | /* Procedures */ | |
192 | declare_mem_map_procs(mem_true16_map_rgb_color, mem_true16_map_color_rgb); | |
193 | declare_mem_procs(mem_true16_copy_mono, mem_true16_copy_color, mem_true16_fill_rectangle); | |
194 | ||
195 | /* The device descriptor. */ | |
196 | private gx_device_procs mem_true16_procs = | |
197 | mem_procs(mem_true16_map_rgb_color, mem_true16_map_color_rgb, | |
198 | mem_true16_copy_mono, mem_true16_copy_color, mem_true16_fill_rectangle); | |
199 | ||
200 | /* The instance is public. */ | |
201 | gx_device_memory mem_true16_color_device = | |
202 | mem_device("image(16)", 16, mem_true16_procs); | |
203 | ||
204 | /* Map a r-g-b color to a color index. */ | |
205 | private gx_color_index | |
206 | mem_true16_map_rgb_color(gx_device *dev, gx_color_value r, gx_color_value g, | |
207 | gx_color_value b) | |
208 | { return ((r >> (gx_color_value_bits - 5)) << 11) + | |
209 | ((g >> (gx_color_value_bits - 6)) << 5) + | |
210 | (b >> (gx_color_value_bits - 5)); | |
211 | } | |
212 | ||
213 | /* Map a color index to a r-g-b color. */ | |
214 | private int | |
215 | mem_true16_map_color_rgb(gx_device *dev, gx_color_index color, | |
216 | gx_color_value prgb[3]) | |
217 | { ushort value; | |
218 | value = color >> 11; | |
219 | prgb[0] = ((value << 11) + (value << 6) + (value << 1) + (value >> 4)) >> (16 - gx_color_value_bits); | |
220 | value = (color >> 6) & 0x7f; | |
221 | prgb[1] = ((value << 10) + (value << 4) + (value >> 2)) >> (16 - gx_color_value_bits); | |
222 | value = color & 0x3f; | |
223 | prgb[2] = ((value << 11) + (value << 6) + (value << 1) + (value >> 4)) >> (16 - gx_color_value_bits); | |
224 | return 0; | |
225 | } | |
226 | ||
227 | /* Convert x coordinate to byte offset in scan line. */ | |
228 | #undef x_to_byte | |
229 | #define x_to_byte(x) ((x) << 1) | |
230 | ||
231 | /* Fill a rectangle with a color. */ | |
232 | private int | |
233 | mem_true16_fill_rectangle(gx_device *dev, | |
234 | int x, int y, int w, int h, gx_color_index color) | |
235 | { declare_scan_ptr(dest); | |
236 | check_rect(); | |
237 | setup_rect(dest); | |
238 | while ( h-- > 0 ) | |
239 | { ushort *pptr = (ushort *)dest; | |
240 | int cnt = w; | |
241 | do { *pptr++ = (ushort)color; } while ( --cnt > 0 ); | |
242 | inc_chunk_ptr(dest, draster); | |
243 | } | |
244 | return 0; | |
245 | } | |
246 | ||
247 | /* Copy a monochrome bitmap. */ | |
248 | private int | |
249 | mem_true16_copy_mono(gx_device *dev, | |
250 | byte *base, int sourcex, int sraster, gx_bitmap_id id, | |
251 | int x, int y, int w, int h, gx_color_index zero, gx_color_index one) | |
252 | { byte *line; | |
253 | int first_bit; | |
254 | declare_scan_ptr(dest); | |
255 | check_rect(); | |
256 | setup_rect(dest); | |
257 | line = base + (sourcex >> 3); | |
258 | first_bit = 0x80 >> (sourcex & 7); | |
259 | while ( h-- > 0 ) | |
260 | { register ushort *pptr = (ushort *)dest; | |
261 | byte *sptr = line; | |
262 | register int sbyte = *sptr++; | |
263 | register int bit = first_bit; | |
264 | int count = w; | |
265 | do | |
266 | { if ( sbyte & bit ) | |
267 | { if ( one != gx_no_color_index ) | |
268 | *pptr = (ushort)one; | |
269 | } | |
270 | else | |
271 | { if ( zero != gx_no_color_index ) | |
272 | *pptr = (ushort)zero; | |
273 | } | |
274 | if ( (bit >>= 1) == 0 ) | |
275 | bit = 0x80, sbyte = *sptr++; | |
276 | pptr++; | |
277 | } | |
278 | while ( --count > 0 ); | |
279 | line += sraster; | |
280 | inc_chunk_ptr(dest, draster); | |
281 | } | |
282 | return 0; | |
283 | } | |
284 | ||
285 | /* Copy a color bitmap. */ | |
286 | private int | |
287 | mem_true16_copy_color(gx_device *dev, | |
288 | byte *base, int sourcex, int sraster, gx_bitmap_id id, | |
289 | int x, int y, int w, int h) | |
290 | { check_rect(); | |
291 | return copy_byte_rect(mdev, base + x_to_byte(sourcex), sraster, | |
292 | x_to_byte(x), y, x_to_byte(w), h); | |
293 | } | |
294 | ||
295 | /* ------ 24- or 32-bit true color ------ */ | |
296 | ||
297 | /* Procedures */ | |
298 | declare_mem_map_procs(mem_true_map_rgb_color, mem_true_map_color_rgb); | |
299 | ||
300 | /* The device descriptor. */ | |
301 | #define mem_true_procs(copy_mono, copy_color, fill_rectangle)\ | |
302 | mem_procs(mem_true_map_rgb_color, mem_true_map_color_rgb,\ | |
303 | copy_mono, copy_color, fill_rectangle) | |
304 | ||
305 | /* We want the bytes of a color always to be in the order -,r,g,b, */ | |
306 | /* but we want to manipulate colors as longs. This requires careful */ | |
307 | /* handling to be byte-order independent. */ | |
308 | #define color_byte(cx,i) (((byte *)&(cx))[i]) | |
309 | ||
310 | /* Map a r-g-b color to a color index. */ | |
311 | private gx_color_index | |
312 | mem_true_map_rgb_color(gx_device *dev, gx_color_value r, gx_color_value g, | |
313 | gx_color_value b) | |
314 | { return gx_color_value_to_byte(b) + | |
315 | ((uint)gx_color_value_to_byte(g) << 8) + | |
316 | ((ulong)gx_color_value_to_byte(r) << 16); | |
317 | } | |
318 | ||
319 | /* Map a color index to a r-g-b color. */ | |
320 | private int | |
321 | mem_true_map_color_rgb(gx_device *dev, gx_color_index color, | |
322 | gx_color_value prgb[3]) | |
323 | { prgb[0] = gx_color_value_from_byte(color >> 16); | |
324 | prgb[1] = gx_color_value_from_byte((color >> 8) & 0xff); | |
325 | prgb[2] = gx_color_value_from_byte(color & 0xff); | |
326 | return 0; | |
327 | } | |
328 | ||
329 | /* ------ 24-bit color ------ */ | |
330 | /* 24-bit takes less space than 32-bit, but is slower. */ | |
331 | ||
332 | /* Procedures */ | |
333 | declare_mem_procs(mem_true24_copy_mono, mem_true24_copy_color, mem_true24_fill_rectangle); | |
334 | ||
335 | /* The device descriptor. */ | |
336 | private gx_device_procs mem_true24_procs = | |
337 | mem_true_procs(mem_true24_copy_mono, mem_true24_copy_color, | |
338 | mem_true24_fill_rectangle); | |
339 | gx_device_memory mem_true24_color_device = | |
340 | mem_device("image(24)", 24, mem_true24_procs); | |
341 | ||
342 | /* Convert x coordinate to byte offset in scan line. */ | |
343 | #undef x_to_byte | |
344 | #define x_to_byte(x) ((x) * 3) | |
345 | ||
346 | /* Unpack a color into its bytes. */ | |
347 | #define declare_unpack_color(r, g, b, color)\ | |
348 | byte r = (byte)(color >> 16);\ | |
349 | byte g = (byte)((uint)color >> 8);\ | |
350 | byte b = (byte)color | |
351 | #define put3(ptr, r, g, b)\ | |
352 | ptr[0] = r, ptr[1] = g, ptr[2] = b | |
353 | ||
354 | /* Fill a rectangle with a color. */ | |
355 | private int | |
356 | mem_true24_fill_rectangle(gx_device *dev, | |
357 | int x, int y, int w, int h, gx_color_index color) | |
358 | { declare_unpack_color(r, g, b, color); | |
359 | declare_scan_ptr(dest); | |
360 | check_rect(); | |
361 | setup_rect(dest); | |
362 | while ( h-- > 0 ) | |
363 | { register int cnt = w; | |
364 | register byte *pptr = dest; | |
365 | do { put3(pptr, r, g, b); pptr += 3; } while ( --cnt > 0 ); | |
366 | inc_chunk_ptr(dest, draster); | |
367 | } | |
368 | return 0; | |
369 | } | |
370 | ||
371 | /* Copy a monochrome bitmap. */ | |
372 | private int | |
373 | mem_true24_copy_mono(gx_device *dev, | |
374 | byte *base, int sourcex, int sraster, gx_bitmap_id id, | |
375 | int x, int y, int w, int h, gx_color_index zero, gx_color_index one) | |
376 | { byte *line; | |
377 | int first_bit; | |
378 | declare_unpack_color(r0, g0, b0, zero); | |
379 | declare_unpack_color(r1, g1, b1, one); | |
380 | declare_scan_ptr(dest); | |
381 | check_rect(); | |
382 | setup_rect(dest); | |
383 | line = base + (sourcex >> 3); | |
384 | first_bit = 0x80 >> (sourcex & 7); | |
385 | while ( h-- > 0 ) | |
386 | { register byte *pptr = dest; | |
387 | byte *sptr = line; | |
388 | register int sbyte = *sptr++; | |
389 | register int bit = first_bit; | |
390 | int count = w; | |
391 | do | |
392 | { if ( sbyte & bit ) | |
393 | { if ( one != gx_no_color_index ) | |
394 | put3(pptr, r1, g1, b1); | |
395 | } | |
396 | else | |
397 | { if ( zero != gx_no_color_index ) | |
398 | put3(pptr, r0, g0, b0); | |
399 | } | |
400 | pptr += 3; | |
401 | if ( (bit >>= 1) == 0 ) | |
402 | bit = 0x80, sbyte = *sptr++; | |
403 | } | |
404 | while ( --count > 0 ); | |
405 | line += sraster; | |
406 | inc_chunk_ptr(dest, draster); | |
407 | } | |
408 | return 0; | |
409 | } | |
410 | ||
411 | /* Copy a color bitmap. */ | |
412 | private int | |
413 | mem_true24_copy_color(gx_device *dev, | |
414 | byte *base, int sourcex, int sraster, gx_bitmap_id id, | |
415 | int x, int y, int w, int h) | |
416 | { check_rect(); | |
417 | return copy_byte_rect(mdev, base + x_to_byte(sourcex), sraster, | |
418 | x_to_byte(x), y, x_to_byte(w), h); | |
419 | } | |
420 | ||
421 | /* ------ 32-bit color ------ */ | |
422 | ||
423 | /* Procedures */ | |
424 | declare_mem_procs(mem_true32_copy_mono, mem_true32_copy_color, mem_true32_fill_rectangle); | |
425 | ||
426 | /* The device descriptor. */ | |
427 | private gx_device_procs mem_true32_procs = | |
428 | mem_true_procs(mem_true32_copy_mono, mem_true32_copy_color, | |
429 | mem_true32_fill_rectangle); | |
430 | gx_device_memory mem_true32_color_device = | |
431 | mem_device("image(32)", 32, mem_true32_procs); | |
432 | ||
433 | /* Convert x coordinate to byte offset in scan line. */ | |
434 | #undef x_to_byte | |
435 | #define x_to_byte(x) ((x) << 2) | |
436 | ||
437 | /* Swap the bytes of a color if needed. */ | |
438 | #if arch_is_big_endian | |
439 | # define arrange_bytes(color) (color) | |
440 | #else | |
441 | # define arrange_bytes(color)\ | |
442 | (((color) >> 24) + (((color) >> 16) & 0xff00) +\ | |
443 | (((color) & 0xff00) << 8) + ((color) << 24)) | |
444 | #endif | |
445 | ||
446 | /* Fill a rectangle with a color. */ | |
447 | private int | |
448 | mem_true32_fill_rectangle(gx_device *dev, | |
449 | int x, int y, int w, int h, gx_color_index color) | |
450 | { gx_color_index a_color = arrange_bytes(color); | |
451 | declare_scan_ptr(dest); | |
452 | check_rect(); | |
453 | setup_rect(dest); | |
454 | while ( h-- > 0 ) | |
455 | { gx_color_index *pptr = (gx_color_index *)dest; | |
456 | int cnt = w; | |
457 | do { *pptr++ = a_color; } while ( --cnt > 0 ); | |
458 | inc_chunk_ptr(dest, draster); | |
459 | } | |
460 | return 0; | |
461 | } | |
462 | ||
463 | /* Copy a monochrome bitmap. */ | |
464 | private int | |
465 | mem_true32_copy_mono(gx_device *dev, | |
466 | byte *base, int sourcex, int sraster, gx_bitmap_id id, | |
467 | int x, int y, int w, int h, gx_color_index zero, gx_color_index one) | |
468 | { gx_color_index a_zero = arrange_bytes(zero); | |
469 | gx_color_index a_one = arrange_bytes(one); | |
470 | byte *line; | |
471 | int first_bit; | |
472 | declare_scan_ptr(dest); | |
473 | check_rect(); | |
474 | setup_rect(dest); | |
475 | line = base + (sourcex >> 3); | |
476 | first_bit = 0x80 >> (sourcex & 7); | |
477 | while ( h-- > 0 ) | |
478 | { register gx_color_index *pptr = (gx_color_index *)dest; | |
479 | byte *sptr = line; | |
480 | register int sbyte = *sptr++; | |
481 | register int bit = first_bit; | |
482 | int count = w; | |
483 | do | |
484 | { if ( sbyte & bit ) | |
485 | { if ( one != gx_no_color_index ) | |
486 | *pptr = a_one; | |
487 | } | |
488 | else | |
489 | { if ( zero != gx_no_color_index ) | |
490 | *pptr = a_zero; | |
491 | } | |
492 | if ( (bit >>= 1) == 0 ) | |
493 | bit = 0x80, sbyte = *sptr++; | |
494 | pptr++; | |
495 | } | |
496 | while ( --count > 0 ); | |
497 | line += sraster; | |
498 | inc_chunk_ptr(dest, draster); | |
499 | } | |
500 | return 0; | |
501 | } | |
502 | ||
503 | /* Copy a color bitmap. */ | |
504 | private int | |
505 | mem_true32_copy_color(gx_device *dev, | |
506 | byte *base, int sourcex, int sraster, gx_bitmap_id id, | |
507 | int x, int y, int w, int h) | |
508 | { check_rect(); | |
509 | return copy_byte_rect(mdev, base + x_to_byte(sourcex), sraster, | |
510 | x_to_byte(x), y, x_to_byte(w), h); | |
511 | } |