Sun, 25 Aug 2002 13:21:28 +0000
cloning an input context wasn't updating last_input_context
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
5 #include "type.h"
6 #include "bitblt.h"
9 #define DIV_ROUND_UP(count,pow2) (((count) - 1) / (pow2) + 1)
12 static const u8 bit_reverse_byte [0x100] =
13 {
14 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
15 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
16 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
17 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
18 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
19 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
20 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
21 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
22 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
23 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
24 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
25 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
26 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
27 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
28 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
29 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
30 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
31 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
32 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
33 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
34 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
35 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
36 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
37 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
38 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
39 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
40 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
41 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
42 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
43 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
44 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
45 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
46 };
48 static word_type bit_reverse_word (word_type d)
49 {
50 return (bit_reverse_byte [d >> 24] |
51 (bit_reverse_byte [(d >> 16) & 0xff] << 8) |
52 (bit_reverse_byte [(d >> 8) & 0xff] << 16) |
53 (bit_reverse_byte [d & 0xff] << 24));
54 }
57 static u32 *temp_buffer;
58 static u32 temp_buffer_size;
60 static void realloc_temp_buffer (u32 size)
61 {
62 if (size <= temp_buffer_size)
63 return;
64 temp_buffer = realloc (temp_buffer, size);
65 if (! temp_buffer)
66 {
67 fprintf (stderr, "realloc failed in bitblt library\n");
68 exit (2);
69 }
70 temp_buffer_size = size;
71 }
74 static inline word_type pixel_mask (x)
75 {
76 #ifdef LSB_LEFT
77 return (1 << x);
78 #else
79 return (1 << ((BITS_PER_WORD - 1) - x));
80 #endif
81 };
83 Bitmap *create_bitmap (Rect *rect)
84 {
85 Bitmap *bitmap;
86 u32 width = rect_width (rect);
87 u32 height = rect_height (rect);
89 if ((width <= 0) || (height <= 0))
90 return (NULL);
92 bitmap = calloc (1, sizeof (Bitmap));
93 if (! bitmap)
94 return (NULL);
95 bitmap->rect = * rect;
96 bitmap->row_words = DIV_ROUND_UP (width, BITS_PER_WORD);
97 bitmap->bits = calloc (1, height * bitmap->row_words * sizeof (word_type));
98 if (! bitmap->bits)
99 {
100 free (bitmap);
101 return (NULL);
102 }
103 return (bitmap);
104 }
106 void free_bitmap (Bitmap *bitmap)
107 {
108 free (bitmap->bits);
109 free (bitmap);
110 }
112 boolean get_pixel (Bitmap *bitmap, Point coord)
113 {
114 word_type *p;
115 if ((coord.x < bitmap->rect.min.x) ||
116 (coord.x >= bitmap->rect.max.x) ||
117 (coord.y < bitmap->rect.min.y) ||
118 (coord.y >= bitmap->rect.max.y))
119 return (0);
120 p = bitmap->bits +
121 (coord.y - bitmap->rect.min.y) * bitmap->row_words +
122 (coord.x - bitmap->rect.min.x) / BITS_PER_WORD;
123 return ((*p & pixel_mask (coord.x & (BITS_PER_WORD - 1))) != 0);
124 }
126 void set_pixel (Bitmap *bitmap, Point coord, boolean value)
127 {
128 word_type *p;
129 if ((coord.x < bitmap->rect.min.x) ||
130 (coord.x >= bitmap->rect.max.x) ||
131 (coord.y < bitmap->rect.min.y) ||
132 (coord.y >= bitmap->rect.max.y))
133 return;
134 p = bitmap->bits +
135 (coord.y - bitmap->rect.min.y) * bitmap->row_words +
136 (coord.x - bitmap->rect.min.x) / BITS_PER_WORD;
137 if (value)
138 *p |= pixel_mask (coord.x & (BITS_PER_WORD - 1));
139 else
140 *p &= ~pixel_mask (coord.x & (BITS_PER_WORD - 1));
141 }
144 /* modifies rect1 to be the intersection of rect1 and rect2;
145 returns true if intersection is non-null */
146 static boolean clip_rect (Rect *rect1, Rect *rect2)
147 {
148 if (rect1->min.y > rect2->max.y)
149 goto empty;
150 if (rect1->min.y < rect2->min.y)
151 {
152 if (rect1->max.y < rect2->max.y)
153 goto empty;
154 rect1->min.y = rect2->min.y;
155 }
156 if (rect1->max.y > rect2->max.y)
157 rect1->max.y = rect2->max.y;
159 if (rect1->min.x > rect2->max.x)
160 goto empty;
161 if (rect1->min.x < rect2->min.x)
162 {
163 if (rect1->max.x < rect2->max.x)
164 goto empty;
165 rect1->min.x = rect2->min.x;
166 }
167 if (rect1->max.x > rect2->max.x)
168 rect1->max.x = rect2->max.x;
170 empty:
171 rect1->min.x = rect1->min.y =
172 rect1->max.x = rect1->max.y = 0;
173 return (0);
174 }
177 #if 0
178 static void blt_background (Bitmap *dest_bitmap,
179 Rect *dest_rect)
180 {
181 s32 y;
182 word_type *rp;
184 /* This function requires a non-null dest rect */
185 assert (dest_rect->min.x < dest_rect->max.x);
186 assert (dest_rect->min.y < dest_rect->max.y);
188 /* and that the rows of the dest rect lie entirely within the dest bitmap */
189 assert (dest_rect->min.y >= dest_bitmap->rect->min.y);
190 assert (dest_rect->max.y <= dest_bitmap->rect->max.y);
192 /* clip the x axis of the dest_rect to the bounds of the dest bitmap */
193 if (dest_rect->min.x < dest_bitmap->rect.min.x)
194 dest_rect->min.x = dest_bitmap->rect.min.x;
195 if (dest_rect->max.x > dest_bitmap->rect.max.x)
196 dest_rect->max.x = dest_bitmap->rect.max.x;
198 rp = ???;
199 for (y = 0; y < rect_height (dest_rect); y++)
200 {
201 ???;
202 rp += dest_bitmap->row_words;
203 }
204 }
207 static void blt (Bitmap *src_bitmap,
208 Rect *src_rect,
209 Bitmap *dest_bitmap,
210 Rect *dest_rect)
211 {
212 s32 y;
213 word_type *rp;
215 /* This function requires a non-null src rect */
216 assert (dest_rect->min.x < dest_rect->max.x);
217 assert (dest_rect->min.y < dest_rect->max.y);
219 /* and a non-null dest rect */
220 assert (dest_rect->min.x < dest_rect->max.x);
221 assert (dest_rect->min.y < dest_rect->max.y);
223 /* and that the widths and heights of the rects match */
224 assert (rect_width (src_rect) == rect_width (dest_rect));
225 assert (rect_height (src_rect) == rect_height (dest_rect));
227 /* and that the rows of the src rect lie entirely within the src bitmap */
228 assert (dest_rect->min.y >= dest_bitmap->rect->min.y);
229 assert (dest_rect->max.y <= dest_bitmap->rect->max.y);
231 /* and that the rows of the dest rect lie entirely within the dest bitmap */
232 assert (dest_rect->min.y >= dest_bitmap->rect->min.y);
233 assert (dest_rect->max.y <= dest_bitmap->rect->max.y);
235 /* clip the x axis of the dest_rect to the bounds of the dest bitmap,
236 and adjust the src_rect to match */
237 if (dest_rect->min.x < dest_bitmap->rect.min.x)
238 {
239 src_rect->min.x += ???;
240 dest_rect->min.x = dest_bitmap->rect.min.x;
241 }
242 if (dest_rect->max.x > dest_bitmap->rect.max.x)
243 {
244 dest_rect->max.x = dest_bitmap->rect.max.x;
245 }
247 rp = ???;
248 for (y = 0; y < rect_height (dest_rect); y++)
249 {
250 ???;
251 rp += dest_bitmap->row_words;
252 }
253 }
256 Bitmap *bitblt (Bitmap *src_bitmap,
257 Rect *src_rect,
258 Bitmap *dest_bitmap,
259 Point *dest_min,
260 int tfn,
261 int background)
262 {
263 Rect sr, dr; /* src and dest rects, clipped to visible portion of
264 dest rect */
265 u32 drw, drh; /* dest rect width, height - gets adjusted */
266 Point src_point, dest_point;
268 {
269 sr = * src_rect;
271 u32 srw = rect_width (& sr);
272 u32 srh = rect_height (& sr);
274 if ((srw < 0) || (srh < 0))
275 goto done; /* the source rect is empty! */
277 dr.min = * dest_min;
278 dr.max.x = dr.min.x + srw;
279 dr.max.y = dr.min.y + srh;
280 }
282 if (! dest_bitmap)
283 {
284 dest_bitmap = create_bitmap (& dr);
285 if (! dest_bitmap)
286 return (NULL);
287 }
289 if ((dr.min.x >= dest_bitmap->rect.max.x) ||
290 (dr.min.y >= dest_bitmap->rect.max.y))
291 goto done; /* the dest rect isn't even in the dest bitmap! */
293 /* crop dest rect to dest bitmap */
295 delta = dest_bitmap->rect.min.x - dr.min.x;
296 if (delta > 0)
297 {
298 sr.min.x += delta;
299 dr.min.x += delta;
300 }
302 delta = dest_bitmap->rect.min.y - dr.min.y;
303 if (delta > 0)
304 {
305 sr.min.y += delta;
306 dr.min.y += delta;
307 }
309 delta = dr.max.x - dest_bitmap->rect.max.x;
310 if (delta > 0)
311 {
312 sr.max.x -= delta;
313 dr.max.x -= delta;
314 }
316 delta = dr.max.y - dest_bitmap->rect.max.y;
317 if (delta > 0)
318 {
319 sr.max.x -= delta;
320 dr.max.x -= delta;
321 }
323 drw = rect_width (& dr);
324 drh = rect_height (& dh);
326 /* if the source rect min y is >= the source bitmap max y,
327 we transfer background color to the entire dest rect */
328 if (sr.min.y >= src->rect.max.y)
329 {
330 blt_background (dest_bitmap, & dr);
331 goto done;
332 }
334 /* if the source rect min y is less than the source bitmap min y,
335 we need to transfer some backgound color to the top part of the dest
336 rect */
337 if (sr.min.y < src->rect.min.y)
338 {
339 Rect dr2;
340 uint32 bg_height;
342 bg_height = src->rect.min.y - sr.min.y;
343 if (bg_height > sh)
344 bg_height = sh;
346 dr2 = dr;
347 dr2.max.y = dr2.min.y + bg_height;
349 blt_background (dest_bitmap, & dr2);
351 /* now reduce the rect height by the number of lines of background
352 color */
353 sr.min.y += bg_height;
354 dr.min.y += bg_height;
355 sh -= bg_height;
356 dh -= bg_height;
358 if (sr.min.y == sr.max.y)
359 goto done;
360 }
362 /* now blt the available rows of the source rect */
364 /* now transfer the background color to any remaining rows of the
365 dest rect */
366 if (??? )
367 {
368 blt_background (dest_bitmap, & dr);
369 }
371 done:
372 return (dest_bitmap);
373 }
374 #else
375 Bitmap *bitblt (Bitmap *src_bitmap,
376 Rect *src_rect,
377 Bitmap *dest_bitmap,
378 Point *dest_min,
379 int tfn,
380 int background)
381 {
382 Point src_point, dest_point;
384 if (! dest_bitmap)
385 {
386 Rect dest_rect = {{ 0, 0 }, { dest_min->x + rect_width (src_rect),
387 dest_min->y + rect_height (src_rect) }};
388 dest_bitmap = create_bitmap (& dest_rect);
389 if (! dest_bitmap)
390 return (NULL);
391 }
393 for (src_point.y = src_rect->min.y;
394 src_point.y < src_rect->max.y;
395 src_point.y++)
396 {
397 dest_point.y = dest_min->y + src_point.y - src_rect->min.y;
399 for (src_point.x = src_rect->min.x;
400 src_point.x < src_rect->max.x;
401 src_point.x++)
402 {
403 boolean a, b, c;
405 dest_point.x = dest_min->x + src_point.x - src_rect->min.x;
407 a = get_pixel (src_bitmap, src_point);
408 b = get_pixel (dest_bitmap, dest_point);
409 c = (tfn & (1 << (a * 2 + b))) != 0;
411 set_pixel (dest_bitmap, dest_point, c);
412 }
413 }
414 return (dest_bitmap);
415 }
416 #endif
419 /* in-place transformations */
420 void flip_h (Bitmap *src)
421 {
422 word_type *rp; /* row pointer */
423 word_type *p1; /* work src ptr */
424 word_type *p2; /* work dest ptr */
425 s32 y;
426 int shift1, shift2;
428 realloc_temp_buffer ((src->row_words + 1) * sizeof (word_type));
430 rp = src->bits;
431 if ((rect_width (& src->rect) & 7) == 0)
432 {
433 for (y = src->rect.min.y; y < src->rect.max.y; y++)
434 {
435 memcpy (temp_buffer, rp, src->row_words * sizeof (word_type));
436 p1 = temp_buffer + src->row_words;
437 p2 = rp;
439 while (p1 >= temp_buffer)
440 *(p2++) = bit_reverse_word (*(p1--));
442 rp += src->row_words;
443 }
444 return;
445 }
447 temp_buffer [0] = 0;
448 shift1 = rect_width (& src->rect) & (BITS_PER_WORD - 1);
449 shift2 = BITS_PER_WORD - shift1;
451 for (y = src->rect.min.y; y < src->rect.max.y; y++)
452 {
453 word_type d1, d2;
455 memcpy (temp_buffer + 1, rp, src->row_words * sizeof (word_type));
456 p1 = temp_buffer + src->row_words;
457 p2 = rp;
459 d2 = *(p1--);
461 while (p1 >= temp_buffer)
462 {
463 d1 = *(p1--);
464 *(p2++) = bit_reverse_word ((d1 << shift1) | (d2 >> shift2));
465 d2 = d1;
466 }
468 rp += src->row_words;
469 }
470 }
472 void flip_v (Bitmap *src)
473 {
474 word_type *p1, *p2;
476 realloc_temp_buffer (src->row_words * sizeof (word_type));
478 p1 = src->bits;
479 p2 = src->bits + src->row_words * (rect_height (& src->rect) - 1);
480 while (p1 < p2)
481 {
482 memcpy (temp_buffer, p1, src->row_words * sizeof (word_type));
483 memcpy (p1, p2, src->row_words * sizeof (word_type));
484 memcpy (p2, temp_buffer, src->row_words * sizeof (word_type));
485 p1 += src->row_words;
486 p2 -= src->row_words;
487 }
488 }
490 void rot_180 (Bitmap *src) /* combination of flip_h and flip_v */
491 {
492 flip_h (src);
493 flip_v (src);
494 }
496 /* "in-place" transformations - will allocate new memory and free old */
497 void transpose (Bitmap *src)
498 {
499 u32 new_row_words = DIV_ROUND_UP (rect_height (& src->rect), 32);
500 word_type *new_bits;
502 new_bits = calloc (1, new_row_words * rect_width (& src->rect) * sizeof (word_type));
504 /* $$$ more code needed here */
505 }
507 void rot_90 (Bitmap *src) /* transpose + flip_h */
508 {
509 transpose (src);
510 flip_h (src);
511 }
513 void rot_270 (Bitmap *src) /* transpose + flip_v */
514 {
515 transpose (src);
516 flip_v (src);
517 }