bitblt.c

Mon, 26 Aug 2002 06:03:55 +0000

author
eric
date
Mon, 26 Aug 2002 06:03:55 +0000
changeset 48
3d0be1c1c1b2
parent 47
bfc6aaa089b0
child 53
bb180150e603
permissions
-rw-r--r--

now use C99 stdint.h and stdbool.h

eric@48 1 #include <stdbool.h>
eric@48 2 #include <stdint.h>
eric@47 3 #include <assert.h>
eric@42 4 #include <stdio.h>
eric@2 5 #include <stdlib.h>
eric@42 6 #include <string.h>
eric@2 7
eric@2 8 #include "bitblt.h"
eric@2 9
eric@42 10
eric@43 11 #define DIV_ROUND_UP(count,pow2) (((count) - 1) / (pow2) + 1)
eric@42 12
eric@42 13
eric@48 14 static const uint8_t bit_reverse_byte [0x100] =
eric@42 15 {
eric@42 16 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
eric@42 17 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
eric@42 18 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
eric@42 19 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
eric@42 20 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
eric@42 21 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
eric@42 22 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
eric@42 23 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
eric@42 24 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
eric@42 25 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
eric@42 26 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
eric@42 27 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
eric@42 28 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
eric@42 29 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
eric@42 30 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
eric@42 31 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
eric@42 32 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
eric@42 33 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
eric@42 34 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
eric@42 35 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
eric@42 36 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
eric@42 37 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
eric@42 38 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
eric@42 39 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
eric@42 40 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
eric@42 41 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
eric@42 42 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
eric@42 43 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
eric@42 44 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
eric@42 45 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
eric@42 46 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
eric@42 47 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
eric@42 48 };
eric@42 49
eric@47 50
eric@48 51 void reverse_bits (uint8_t *p, int byte_count)
eric@47 52 {
eric@47 53 while (byte_count--)
eric@47 54 {
eric@47 55 (*p) = bit_reverse_byte [*p];
eric@47 56 p++;
eric@47 57 }
eric@47 58 }
eric@47 59
eric@47 60
eric@43 61 static word_type bit_reverse_word (word_type d)
eric@43 62 {
eric@43 63 return (bit_reverse_byte [d >> 24] |
eric@43 64 (bit_reverse_byte [(d >> 16) & 0xff] << 8) |
eric@43 65 (bit_reverse_byte [(d >> 8) & 0xff] << 16) |
eric@43 66 (bit_reverse_byte [d & 0xff] << 24));
eric@43 67 }
eric@42 68
eric@43 69
eric@47 70 static word_type *temp_buffer;
eric@47 71 static word_type temp_buffer_size;
eric@42 72
eric@48 73 static void realloc_temp_buffer (uint32_t size)
eric@42 74 {
eric@42 75 if (size <= temp_buffer_size)
eric@42 76 return;
eric@42 77 temp_buffer = realloc (temp_buffer, size);
eric@42 78 if (! temp_buffer)
eric@42 79 {
eric@42 80 fprintf (stderr, "realloc failed in bitblt library\n");
eric@42 81 exit (2);
eric@42 82 }
eric@42 83 temp_buffer_size = size;
eric@42 84 }
eric@42 85
eric@42 86
eric@47 87 static inline word_type pixel_mask (int x)
eric@2 88 {
eric@47 89 #if defined (MIXED_ENDIAN) /* disgusting hack for mixed-endian */
eric@47 90 word_type m;
eric@47 91 m = 0x80 >> (x & 7);
eric@47 92 m <<= (x & 24);
eric@47 93 return (m);
eric@47 94 #elif defined (LSB_RIGHT)
eric@47 95 return (1U << ((BITS_PER_WORD - 1) - x));
eric@2 96 #else
eric@47 97 return (1U << x);
eric@2 98 #endif
eric@42 99 };
eric@2 100
eric@47 101
eric@47 102 /* mask for range of bits left..right, inclusive */
eric@47 103 static inline word_type pixel_range_mask (int left, int right)
eric@47 104 {
eric@47 105 word_type m1, m2, val;
eric@47 106
eric@47 107 /* $$$ one of these cases is wrong! */
eric@47 108 #if defined (LSB_RIGHT)
eric@47 109 m1 = (~ 0U) >> left;
eric@47 110 m2 = (~ 0U) << (BITS_PER_WORD - 1 - right);
eric@47 111 #else
eric@47 112 m1 = (~ 0U) << left;
eric@47 113 m2 = (~ 0U) >> (BITS_PER_WORD - 1 - right);
eric@47 114 #endif
eric@47 115 val = m1 & m2;
eric@47 116
eric@47 117 printf ("left %d, right %d, mask %08x\n", left, right, val);
eric@47 118 return (val);
eric@47 119 };
eric@47 120
eric@47 121
eric@42 122 Bitmap *create_bitmap (Rect *rect)
eric@2 123 {
eric@2 124 Bitmap *bitmap;
eric@48 125 uint32_t width = rect_width (rect);
eric@48 126 uint32_t height = rect_height (rect);
eric@2 127
eric@35 128 if ((width <= 0) || (height <= 0))
eric@35 129 return (NULL);
eric@35 130
eric@2 131 bitmap = calloc (1, sizeof (Bitmap));
eric@2 132 if (! bitmap)
eric@2 133 return (NULL);
eric@42 134 bitmap->rect = * rect;
eric@43 135 bitmap->row_words = DIV_ROUND_UP (width, BITS_PER_WORD);
eric@43 136 bitmap->bits = calloc (1, height * bitmap->row_words * sizeof (word_type));
eric@2 137 if (! bitmap->bits)
eric@2 138 {
eric@2 139 free (bitmap);
eric@2 140 return (NULL);
eric@2 141 }
eric@2 142 return (bitmap);
eric@2 143 }
eric@2 144
eric@2 145 void free_bitmap (Bitmap *bitmap)
eric@2 146 {
eric@2 147 free (bitmap->bits);
eric@2 148 free (bitmap);
eric@2 149 }
eric@2 150
eric@48 151 bool get_pixel (Bitmap *bitmap, Point coord)
eric@2 152 {
eric@43 153 word_type *p;
eric@47 154 int w,b;
eric@47 155
eric@42 156 if ((coord.x < bitmap->rect.min.x) ||
eric@42 157 (coord.x >= bitmap->rect.max.x) ||
eric@42 158 (coord.y < bitmap->rect.min.y) ||
eric@42 159 (coord.y >= bitmap->rect.max.y))
eric@2 160 return (0);
eric@47 161 coord.y -= bitmap->rect.min.y;
eric@47 162 coord.x -= bitmap->rect.min.x;
eric@47 163 w = coord.x / BITS_PER_WORD;
eric@47 164 b = coord.x & (BITS_PER_WORD - 1);
eric@47 165 p = bitmap->bits + coord.y * bitmap->row_words + w;
eric@47 166 return (((*p) & pixel_mask (b)) != 0);
eric@2 167 }
eric@2 168
eric@48 169 void set_pixel (Bitmap *bitmap, Point coord, bool value)
eric@2 170 {
eric@43 171 word_type *p;
eric@47 172 int w,b;
eric@47 173
eric@42 174 if ((coord.x < bitmap->rect.min.x) ||
eric@42 175 (coord.x >= bitmap->rect.max.x) ||
eric@42 176 (coord.y < bitmap->rect.min.y) ||
eric@42 177 (coord.y >= bitmap->rect.max.y))
eric@2 178 return;
eric@47 179 coord.y -= bitmap->rect.min.y;
eric@47 180 coord.x -= bitmap->rect.min.x;
eric@47 181 w = coord.x / BITS_PER_WORD;
eric@47 182 b = coord.x & (BITS_PER_WORD - 1);
eric@47 183 p = bitmap->bits + coord.y * bitmap->row_words + w;
eric@2 184 if (value)
eric@47 185 (*p) |= pixel_mask (b);
eric@2 186 else
eric@47 187 (*p) &= ~pixel_mask (b);
eric@2 188 }
eric@2 189
eric@2 190
eric@42 191 /* modifies rect1 to be the intersection of rect1 and rect2;
eric@42 192 returns true if intersection is non-null */
eric@48 193 static bool clip_rect (Rect *rect1, Rect *rect2)
eric@42 194 {
eric@42 195 if (rect1->min.y > rect2->max.y)
eric@42 196 goto empty;
eric@42 197 if (rect1->min.y < rect2->min.y)
eric@42 198 {
eric@42 199 if (rect1->max.y < rect2->max.y)
eric@42 200 goto empty;
eric@42 201 rect1->min.y = rect2->min.y;
eric@42 202 }
eric@42 203 if (rect1->max.y > rect2->max.y)
eric@42 204 rect1->max.y = rect2->max.y;
eric@42 205
eric@42 206 if (rect1->min.x > rect2->max.x)
eric@42 207 goto empty;
eric@42 208 if (rect1->min.x < rect2->min.x)
eric@42 209 {
eric@42 210 if (rect1->max.x < rect2->max.x)
eric@42 211 goto empty;
eric@42 212 rect1->min.x = rect2->min.x;
eric@42 213 }
eric@42 214 if (rect1->max.x > rect2->max.x)
eric@42 215 rect1->max.x = rect2->max.x;
eric@42 216
eric@42 217 empty:
eric@42 218 rect1->min.x = rect1->min.y =
eric@42 219 rect1->max.x = rect1->max.y = 0;
eric@42 220 return (0);
eric@42 221 }
eric@42 222
eric@42 223
eric@43 224 static void blt_background (Bitmap *dest_bitmap,
eric@47 225 Rect dest_rect)
eric@43 226 {
eric@48 227 uint32_t y;
eric@43 228 word_type *rp;
eric@48 229 uint32_t left_bit, left_word;
eric@48 230 uint32_t right_bit, right_word;
eric@47 231 word_type left_mask, right_mask;
eric@48 232 int32_t word_count;
eric@43 233
eric@43 234 /* This function requires a non-null dest rect */
eric@47 235 assert (dest_rect.min.x < dest_rect.max.x);
eric@47 236 assert (dest_rect.min.y < dest_rect.max.y);
eric@43 237
eric@43 238 /* and that the rows of the dest rect lie entirely within the dest bitmap */
eric@47 239 assert (dest_rect.min.y >= dest_bitmap->rect.min.y);
eric@47 240 assert (dest_rect.max.y <= dest_bitmap->rect.max.y);
eric@43 241
eric@43 242 /* clip the x axis of the dest_rect to the bounds of the dest bitmap */
eric@47 243 if (dest_rect.min.x < dest_bitmap->rect.min.x)
eric@47 244 dest_rect.min.x = dest_bitmap->rect.min.x;
eric@47 245 if (dest_rect.max.x > dest_bitmap->rect.max.x)
eric@47 246 dest_rect.max.x = dest_bitmap->rect.max.x;
eric@47 247
eric@47 248 rp = dest_bitmap->bits +
eric@47 249 (dest_rect.min.y - dest_bitmap->rect.min.y) * dest_bitmap->row_words +
eric@47 250 (dest_rect.min.x - dest_bitmap->rect.min.x) / BITS_PER_WORD;
eric@47 251
eric@47 252 left_bit = dest_rect.min.x % BITS_PER_WORD;
eric@47 253 left_word = dest_rect.min.x / BITS_PER_WORD;
eric@47 254
eric@47 255 right_bit = (dest_rect.max.x - 1) % BITS_PER_WORD;
eric@47 256 right_word = (dest_rect.max.x - 1) / BITS_PER_WORD;
eric@47 257
eric@47 258 word_count = right_word + 1 - left_word;
eric@47 259
eric@47 260 /* special case if entire horizontal range fits in a single word */
eric@47 261 if (word_count == 1)
eric@47 262 {
eric@47 263 left_mask = 0;
eric@47 264 right_mask = ~ pixel_range_mask (left_bit, right_bit);
eric@47 265 word_count = 0;
eric@47 266 }
eric@47 267 else
eric@47 268 {
eric@47 269 if (left_bit)
eric@47 270 {
eric@47 271 left_mask = ~ pixel_range_mask (left_bit, BITS_PER_WORD - 1);
eric@47 272 word_count--;
eric@47 273 }
eric@43 274
eric@47 275 if (right_bit != (BITS_PER_WORD - 1))
eric@47 276 {
eric@47 277 right_mask = ~ pixel_range_mask (0, right_bit);
eric@47 278 word_count--;
eric@47 279 }
eric@47 280 }
eric@47 281
eric@47 282 for (y = 0; y < rect_height (& dest_rect); y++)
eric@43 283 {
eric@47 284 word_type *wp = rp;
eric@47 285
eric@47 286 /* partial word at left, if any */
eric@47 287 if (left_mask)
eric@47 288 *(wp++) &= left_mask;
eric@47 289
eric@47 290 /* use Duff's Device for the full words */
eric@47 291 if (word_count)
eric@47 292 {
eric@48 293 int32_t i = word_count;
eric@47 294 switch (i % 8)
eric@47 295 {
eric@47 296 while (i > 0)
eric@47 297 {
eric@47 298 *(wp++) = 0;
eric@47 299 case 7: *(wp++) = 0;
eric@47 300 case 6: *(wp++) = 0;
eric@47 301 case 5: *(wp++) = 0;
eric@47 302 case 4: *(wp++) = 0;
eric@47 303 case 3: *(wp++) = 0;
eric@47 304 case 2: *(wp++) = 0;
eric@47 305 case 1: *(wp++) = 0;
eric@47 306 case 0: i -= 8;
eric@47 307 }
eric@47 308 }
eric@47 309 }
eric@47 310
eric@47 311 /* partial word at right, if any */
eric@47 312 if (right_mask)
eric@47 313 *wp &= right_mask;
eric@47 314
eric@47 315 /* advance to next row */
eric@43 316 rp += dest_bitmap->row_words;
eric@43 317 }
eric@43 318 }
eric@43 319
eric@43 320
eric@47 321 #if 0
eric@43 322 static void blt (Bitmap *src_bitmap,
eric@43 323 Rect *src_rect,
eric@43 324 Bitmap *dest_bitmap,
eric@43 325 Rect *dest_rect)
eric@43 326 {
eric@48 327 int32_t y;
eric@43 328 word_type *rp;
eric@43 329
eric@43 330 /* This function requires a non-null src rect */
eric@43 331 assert (dest_rect->min.x < dest_rect->max.x);
eric@43 332 assert (dest_rect->min.y < dest_rect->max.y);
eric@43 333
eric@43 334 /* and a non-null dest rect */
eric@43 335 assert (dest_rect->min.x < dest_rect->max.x);
eric@43 336 assert (dest_rect->min.y < dest_rect->max.y);
eric@43 337
eric@43 338 /* and that the widths and heights of the rects match */
eric@43 339 assert (rect_width (src_rect) == rect_width (dest_rect));
eric@43 340 assert (rect_height (src_rect) == rect_height (dest_rect));
eric@43 341
eric@43 342 /* and that the rows of the src rect lie entirely within the src bitmap */
eric@43 343 assert (dest_rect->min.y >= dest_bitmap->rect->min.y);
eric@43 344 assert (dest_rect->max.y <= dest_bitmap->rect->max.y);
eric@43 345
eric@43 346 /* and that the rows of the dest rect lie entirely within the dest bitmap */
eric@43 347 assert (dest_rect->min.y >= dest_bitmap->rect->min.y);
eric@43 348 assert (dest_rect->max.y <= dest_bitmap->rect->max.y);
eric@43 349
eric@43 350 /* clip the x axis of the dest_rect to the bounds of the dest bitmap,
eric@43 351 and adjust the src_rect to match */
eric@43 352 if (dest_rect->min.x < dest_bitmap->rect.min.x)
eric@43 353 {
eric@43 354 src_rect->min.x += ???;
eric@43 355 dest_rect->min.x = dest_bitmap->rect.min.x;
eric@43 356 }
eric@43 357 if (dest_rect->max.x > dest_bitmap->rect.max.x)
eric@43 358 {
eric@43 359 dest_rect->max.x = dest_bitmap->rect.max.x;
eric@43 360 }
eric@43 361
eric@43 362 rp = ???;
eric@43 363 for (y = 0; y < rect_height (dest_rect); y++)
eric@43 364 {
eric@43 365 ???;
eric@43 366 rp += dest_bitmap->row_words;
eric@43 367 }
eric@43 368 }
eric@43 369
eric@43 370
eric@47 371 /*
eric@47 372 * The destination rectangle is first clipped to the dest bitmap, and
eric@47 373 * the source rectangle is adjusted in the corresponding manner.
eric@47 374 * What's left is divided into five sections, any of which may be
eric@47 375 * null. The portion that actually corresponds to the intersection of
eric@47 376 * the source rectangle and the source bitmpa is the "middle". The
eric@47 377 * other four sections will use the background color as the source
eric@47 378 * operand.
eric@47 379 *
eric@47 380 *
eric@47 381 * y0 -> -------------------------------------------------
eric@47 382 * | top |
eric@47 383 * | |
eric@47 384 * y1 -> -------------------------------------------------
eric@47 385 * | left | middle | right |
eric@47 386 * | | | |
eric@47 387 * y2 -> -------------------------------------------------
eric@47 388 * | bottom |
eric@47 389 * | |
eric@47 390 * y3 -> -------------------------------------------------
eric@47 391 *
eric@47 392 * ^ ^ ^ ^
eric@47 393 * | | | |
eric@47 394 * x0 x1 x2 x3
eric@47 395 *
eric@47 396 * */
eric@2 397 Bitmap *bitblt (Bitmap *src_bitmap,
eric@42 398 Rect *src_rect,
eric@2 399 Bitmap *dest_bitmap,
eric@42 400 Point *dest_min,
eric@43 401 int tfn,
eric@43 402 int background)
eric@43 403 {
eric@43 404 Rect sr, dr; /* src and dest rects, clipped to visible portion of
eric@43 405 dest rect */
eric@48 406 uint32_t drw, drh; /* dest rect width, height - gets adjusted */
eric@43 407 Point src_point, dest_point;
eric@43 408
eric@47 409 /* dest coordinates: */
eric@48 410 uint32_t x0, x1, x2, x3;
eric@48 411 uint32_t y0, y1, y2, y3;
eric@47 412
eric@43 413 {
eric@43 414 sr = * src_rect;
eric@43 415
eric@48 416 uint32_t srw = rect_width (& sr);
eric@48 417 uint32_t srh = rect_height (& sr);
eric@43 418
eric@43 419 if ((srw < 0) || (srh < 0))
eric@43 420 goto done; /* the source rect is empty! */
eric@43 421
eric@47 422 dr.min.x = dest_min->x;
eric@47 423 dr.min.y = dest_min->y;
eric@43 424 dr.max.x = dr.min.x + srw;
eric@43 425 dr.max.y = dr.min.y + srh;
eric@43 426 }
eric@43 427
eric@43 428 if (! dest_bitmap)
eric@43 429 {
eric@43 430 dest_bitmap = create_bitmap (& dr);
eric@43 431 if (! dest_bitmap)
eric@43 432 return (NULL);
eric@43 433 }
eric@43 434
eric@43 435 if ((dr.min.x >= dest_bitmap->rect.max.x) ||
eric@43 436 (dr.min.y >= dest_bitmap->rect.max.y))
eric@43 437 goto done; /* the dest rect isn't even in the dest bitmap! */
eric@43 438
eric@43 439 /* crop dest rect to dest bitmap */
eric@43 440 delta = dest_bitmap->rect.min.x - dr.min.x;
eric@43 441 if (delta > 0)
eric@43 442 {
eric@43 443 sr.min.x += delta;
eric@43 444 dr.min.x += delta;
eric@43 445 }
eric@43 446
eric@43 447 delta = dest_bitmap->rect.min.y - dr.min.y;
eric@43 448 if (delta > 0)
eric@43 449 {
eric@43 450 sr.min.y += delta;
eric@43 451 dr.min.y += delta;
eric@43 452 }
eric@43 453
eric@43 454 delta = dr.max.x - dest_bitmap->rect.max.x;
eric@43 455 if (delta > 0)
eric@43 456 {
eric@43 457 sr.max.x -= delta;
eric@43 458 dr.max.x -= delta;
eric@43 459 }
eric@43 460
eric@43 461 delta = dr.max.y - dest_bitmap->rect.max.y;
eric@43 462 if (delta > 0)
eric@43 463 {
eric@43 464 sr.max.x -= delta;
eric@43 465 dr.max.x -= delta;
eric@43 466 }
eric@43 467
eric@43 468 drw = rect_width (& dr);
eric@43 469 drh = rect_height (& dh);
eric@43 470
eric@47 471 x0 = dr.min.x;
eric@47 472 y0 = dr.min.y;
eric@47 473 x3 = dr.max.x;
eric@47 474 y3 = dr.max.y;
eric@47 475
eric@47 476 #if 0
eric@43 477 /* if the source rect min y is >= the source bitmap max y,
eric@43 478 we transfer background color to the entire dest rect */
eric@43 479 if (sr.min.y >= src->rect.max.y)
eric@43 480 {
eric@47 481 blt_background (dest_bitmap, dr);
eric@43 482 goto done;
eric@43 483 }
eric@47 484 #endif
eric@47 485
eric@47 486 /* top */
eric@47 487 if (y0 != y1)
eric@47 488 {
eric@47 489 dr2.min.x = x0;
eric@47 490 dr2.max.x = x3;
eric@47 491 dr2.min.y = y0;
eric@47 492 dr2.max.y = y1;
eric@47 493 blt_background (dest_bitmap, & dr2);
eric@47 494 }
eric@43 495
eric@47 496 /*
eric@47 497 * top: if the source rect min y is less than the source bitmap min y,
eric@47 498 * we need to transfer some backgound color to the top part of the dest
eric@47 499 * rect
eric@47 500 */
eric@43 501 if (sr.min.y < src->rect.min.y)
eric@43 502 {
eric@43 503 Rect dr2;
eric@43 504 uint32 bg_height;
eric@43 505
eric@43 506 bg_height = src->rect.min.y - sr.min.y;
eric@43 507 if (bg_height > sh)
eric@43 508 bg_height = sh;
eric@43 509
eric@43 510 dr2 = dr;
eric@43 511 dr2.max.y = dr2.min.y + bg_height;
eric@43 512
eric@43 513 blt_background (dest_bitmap, & dr2);
eric@43 514
eric@43 515 /* now reduce the rect height by the number of lines of background
eric@43 516 color */
eric@43 517 sr.min.y += bg_height;
eric@43 518 dr.min.y += bg_height;
eric@43 519 sh -= bg_height;
eric@43 520 dh -= bg_height;
eric@43 521
eric@43 522 if (sr.min.y == sr.max.y)
eric@43 523 goto done;
eric@43 524 }
eric@43 525
eric@47 526 if (y1 != y2)
eric@47 527 {
eric@47 528 /* left */
eric@47 529 if (x0 != x1)
eric@47 530 {
eric@47 531 dr2.min.x = x1;
eric@47 532 dr2.max.x = x1;
eric@47 533 dr2.min.y = y1;
eric@47 534 dr2.max.y = y2
eric@47 535 blt_background (dest_bitmap, & dr2);
eric@47 536 }
eric@47 537
eric@47 538 /* middle */
eric@47 539 if (x1 != x2)
eric@47 540 {
eric@47 541 /* ??? */
eric@47 542 }
eric@43 543
eric@47 544 /* right */
eric@47 545 if (x2 != x3)
eric@47 546 {
eric@47 547 dr2.min.x = x2;
eric@47 548 dr2.max.x = x3;
eric@47 549 dr2.min.y = y1;
eric@47 550 dr2.max.y = y2
eric@47 551 blt_background (dest_bitmap, & dr2);
eric@47 552 }
eric@47 553 }
eric@47 554
eric@47 555 /* bottom */
eric@47 556 if (y2 != y3)
eric@43 557 {
eric@47 558 dr2.min.x = x0;
eric@47 559 dr2.max.x = x3;
eric@47 560 dr2.min.y = y2;
eric@47 561 dr2.max.y = y3;
eric@47 562 blt_background (dest_bitmap, & dr2);
eric@43 563 }
eric@43 564
eric@43 565 done:
eric@43 566 return (dest_bitmap);
eric@43 567 }
eric@43 568 #else
eric@43 569 Bitmap *bitblt (Bitmap *src_bitmap,
eric@43 570 Rect *src_rect,
eric@43 571 Bitmap *dest_bitmap,
eric@43 572 Point *dest_min,
eric@43 573 int tfn,
eric@43 574 int background)
eric@2 575 {
eric@2 576 Point src_point, dest_point;
eric@2 577
eric@2 578 if (! dest_bitmap)
eric@2 579 {
eric@42 580 Rect dest_rect = {{ 0, 0 }, { dest_min->x + rect_width (src_rect),
eric@42 581 dest_min->y + rect_height (src_rect) }};
eric@42 582 dest_bitmap = create_bitmap (& dest_rect);
eric@2 583 if (! dest_bitmap)
eric@2 584 return (NULL);
eric@2 585 }
eric@2 586
eric@47 587 if (tfn == TF_SRC)
eric@2 588 {
eric@47 589 for (src_point.y = src_rect->min.y;
eric@47 590 src_point.y < src_rect->max.y;
eric@47 591 src_point.y++)
eric@2 592 {
eric@47 593 dest_point.y = dest_min->y + src_point.y - src_rect->min.y;
eric@47 594
eric@47 595 for (src_point.x = src_rect->min.x;
eric@47 596 src_point.x < src_rect->max.x;
eric@47 597 src_point.x++)
eric@47 598 {
eric@48 599 bool a;
eric@2 600
eric@47 601 dest_point.x = dest_min->x + src_point.x - src_rect->min.x;
eric@3 602
eric@47 603 a = get_pixel (src_bitmap, src_point);
eric@47 604 set_pixel (dest_bitmap, dest_point, a);
eric@47 605 }
eric@47 606 }
eric@47 607 }
eric@47 608 else
eric@47 609 {
eric@47 610 for (src_point.y = src_rect->min.y;
eric@47 611 src_point.y < src_rect->max.y;
eric@47 612 src_point.y++)
eric@47 613 {
eric@47 614 dest_point.y = dest_min->y + src_point.y - src_rect->min.y;
eric@47 615
eric@47 616 for (src_point.x = src_rect->min.x;
eric@47 617 src_point.x < src_rect->max.x;
eric@47 618 src_point.x++)
eric@47 619 {
eric@48 620 bool a, b, c;
eric@2 621
eric@47 622 dest_point.x = dest_min->x + src_point.x - src_rect->min.x;
eric@47 623
eric@47 624 a = get_pixel (src_bitmap, src_point);
eric@47 625 b = get_pixel (dest_bitmap, dest_point);
eric@47 626 c = (tfn & (1 << (a * 2 + b))) != 0;
eric@47 627
eric@47 628 set_pixel (dest_bitmap, dest_point, c);
eric@47 629 }
eric@2 630 }
eric@2 631 }
eric@2 632 return (dest_bitmap);
eric@2 633 }
eric@43 634 #endif
eric@42 635
eric@42 636
eric@42 637 /* in-place transformations */
eric@42 638 void flip_h (Bitmap *src)
eric@42 639 {
eric@43 640 word_type *rp; /* row pointer */
eric@43 641 word_type *p1; /* work src ptr */
eric@43 642 word_type *p2; /* work dest ptr */
eric@48 643 int32_t y;
eric@43 644 int shift1, shift2;
eric@42 645
eric@43 646 realloc_temp_buffer ((src->row_words + 1) * sizeof (word_type));
eric@42 647
eric@42 648 rp = src->bits;
eric@42 649 if ((rect_width (& src->rect) & 7) == 0)
eric@42 650 {
eric@42 651 for (y = src->rect.min.y; y < src->rect.max.y; y++)
eric@42 652 {
eric@43 653 memcpy (temp_buffer, rp, src->row_words * sizeof (word_type));
eric@43 654 p1 = temp_buffer + src->row_words;
eric@42 655 p2 = rp;
eric@42 656
eric@42 657 while (p1 >= temp_buffer)
eric@43 658 *(p2++) = bit_reverse_word (*(p1--));
eric@42 659
eric@43 660 rp += src->row_words;
eric@42 661 }
eric@42 662 return;
eric@42 663 }
eric@42 664
eric@42 665 temp_buffer [0] = 0;
eric@43 666 shift1 = rect_width (& src->rect) & (BITS_PER_WORD - 1);
eric@43 667 shift2 = BITS_PER_WORD - shift1;
eric@42 668
eric@42 669 for (y = src->rect.min.y; y < src->rect.max.y; y++)
eric@42 670 {
eric@43 671 word_type d1, d2;
eric@43 672
eric@43 673 memcpy (temp_buffer + 1, rp, src->row_words * sizeof (word_type));
eric@43 674 p1 = temp_buffer + src->row_words;
eric@42 675 p2 = rp;
eric@42 676
eric@43 677 d2 = *(p1--);
eric@42 678
eric@42 679 while (p1 >= temp_buffer)
eric@42 680 {
eric@43 681 d1 = *(p1--);
eric@43 682 *(p2++) = bit_reverse_word ((d1 << shift1) | (d2 >> shift2));
eric@43 683 d2 = d1;
eric@42 684 }
eric@42 685
eric@43 686 rp += src->row_words;
eric@42 687 }
eric@42 688 }
eric@42 689
eric@42 690 void flip_v (Bitmap *src)
eric@42 691 {
eric@43 692 word_type *p1, *p2;
eric@42 693
eric@43 694 realloc_temp_buffer (src->row_words * sizeof (word_type));
eric@42 695
eric@42 696 p1 = src->bits;
eric@43 697 p2 = src->bits + src->row_words * (rect_height (& src->rect) - 1);
eric@42 698 while (p1 < p2)
eric@42 699 {
eric@43 700 memcpy (temp_buffer, p1, src->row_words * sizeof (word_type));
eric@43 701 memcpy (p1, p2, src->row_words * sizeof (word_type));
eric@43 702 memcpy (p2, temp_buffer, src->row_words * sizeof (word_type));
eric@43 703 p1 += src->row_words;
eric@43 704 p2 -= src->row_words;
eric@42 705 }
eric@42 706 }
eric@42 707
eric@42 708 void rot_180 (Bitmap *src) /* combination of flip_h and flip_v */
eric@42 709 {
eric@42 710 flip_h (src);
eric@42 711 flip_v (src);
eric@42 712 }
eric@42 713
eric@42 714 /* "in-place" transformations - will allocate new memory and free old */
eric@42 715 void transpose (Bitmap *src)
eric@42 716 {
eric@48 717 uint32_t new_row_words = DIV_ROUND_UP (rect_height (& src->rect), 32);
eric@43 718 word_type *new_bits;
eric@42 719
eric@43 720 new_bits = calloc (1, new_row_words * rect_width (& src->rect) * sizeof (word_type));
eric@42 721
eric@42 722 /* $$$ more code needed here */
eric@42 723 }
eric@42 724
eric@42 725 void rot_90 (Bitmap *src) /* transpose + flip_h */
eric@42 726 {
eric@42 727 transpose (src);
eric@42 728 flip_h (src);
eric@42 729 }
eric@42 730
eric@42 731 void rot_270 (Bitmap *src) /* transpose + flip_v */
eric@42 732 {
eric@42 733 transpose (src);
eric@42 734 flip_v (src);
eric@42 735 }