bitblt.c

Mon, 26 Aug 2002 05:43:49 +0000

author
eric
date
Mon, 26 Aug 2002 05:43:49 +0000
changeset 47
bfc6aaa089b0
parent 43
b80cb5a4282a
child 48
3d0be1c1c1b2
permissions
-rw-r--r--

fixed 'middle-endian' output from TIFFReadScanline

eric@47 1 #include <assert.h>
eric@42 2 #include <stdio.h>
eric@2 3 #include <stdlib.h>
eric@42 4 #include <string.h>
eric@2 5
eric@11 6 #include "type.h"
eric@2 7 #include "bitblt.h"
eric@2 8
eric@42 9
eric@43 10 #define DIV_ROUND_UP(count,pow2) (((count) - 1) / (pow2) + 1)
eric@42 11
eric@42 12
eric@42 13 static const u8 bit_reverse_byte [0x100] =
eric@42 14 {
eric@42 15 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
eric@42 16 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
eric@42 17 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
eric@42 18 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
eric@42 19 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
eric@42 20 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
eric@42 21 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
eric@42 22 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
eric@42 23 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
eric@42 24 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
eric@42 25 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
eric@42 26 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
eric@42 27 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
eric@42 28 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
eric@42 29 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
eric@42 30 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
eric@42 31 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
eric@42 32 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
eric@42 33 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
eric@42 34 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
eric@42 35 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
eric@42 36 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
eric@42 37 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
eric@42 38 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
eric@42 39 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
eric@42 40 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
eric@42 41 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
eric@42 42 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
eric@42 43 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
eric@42 44 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
eric@42 45 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
eric@42 46 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
eric@42 47 };
eric@42 48
eric@47 49
eric@47 50 void reverse_bits (u8 *p, int byte_count)
eric@47 51 {
eric@47 52 while (byte_count--)
eric@47 53 {
eric@47 54 (*p) = bit_reverse_byte [*p];
eric@47 55 p++;
eric@47 56 }
eric@47 57 }
eric@47 58
eric@47 59
eric@43 60 static word_type bit_reverse_word (word_type d)
eric@43 61 {
eric@43 62 return (bit_reverse_byte [d >> 24] |
eric@43 63 (bit_reverse_byte [(d >> 16) & 0xff] << 8) |
eric@43 64 (bit_reverse_byte [(d >> 8) & 0xff] << 16) |
eric@43 65 (bit_reverse_byte [d & 0xff] << 24));
eric@43 66 }
eric@42 67
eric@43 68
eric@47 69 static word_type *temp_buffer;
eric@47 70 static word_type temp_buffer_size;
eric@42 71
eric@42 72 static void realloc_temp_buffer (u32 size)
eric@42 73 {
eric@42 74 if (size <= temp_buffer_size)
eric@42 75 return;
eric@42 76 temp_buffer = realloc (temp_buffer, size);
eric@42 77 if (! temp_buffer)
eric@42 78 {
eric@42 79 fprintf (stderr, "realloc failed in bitblt library\n");
eric@42 80 exit (2);
eric@42 81 }
eric@42 82 temp_buffer_size = size;
eric@42 83 }
eric@42 84
eric@42 85
eric@47 86 static inline word_type pixel_mask (int x)
eric@2 87 {
eric@47 88 #if defined (MIXED_ENDIAN) /* disgusting hack for mixed-endian */
eric@47 89 word_type m;
eric@47 90 m = 0x80 >> (x & 7);
eric@47 91 m <<= (x & 24);
eric@47 92 return (m);
eric@47 93 #elif defined (LSB_RIGHT)
eric@47 94 return (1U << ((BITS_PER_WORD - 1) - x));
eric@2 95 #else
eric@47 96 return (1U << x);
eric@2 97 #endif
eric@42 98 };
eric@2 99
eric@47 100
eric@47 101 /* mask for range of bits left..right, inclusive */
eric@47 102 static inline word_type pixel_range_mask (int left, int right)
eric@47 103 {
eric@47 104 word_type m1, m2, val;
eric@47 105
eric@47 106 /* $$$ one of these cases is wrong! */
eric@47 107 #if defined (LSB_RIGHT)
eric@47 108 m1 = (~ 0U) >> left;
eric@47 109 m2 = (~ 0U) << (BITS_PER_WORD - 1 - right);
eric@47 110 #else
eric@47 111 m1 = (~ 0U) << left;
eric@47 112 m2 = (~ 0U) >> (BITS_PER_WORD - 1 - right);
eric@47 113 #endif
eric@47 114 val = m1 & m2;
eric@47 115
eric@47 116 printf ("left %d, right %d, mask %08x\n", left, right, val);
eric@47 117 return (val);
eric@47 118 };
eric@47 119
eric@47 120
eric@42 121 Bitmap *create_bitmap (Rect *rect)
eric@2 122 {
eric@2 123 Bitmap *bitmap;
eric@42 124 u32 width = rect_width (rect);
eric@42 125 u32 height = rect_height (rect);
eric@2 126
eric@35 127 if ((width <= 0) || (height <= 0))
eric@35 128 return (NULL);
eric@35 129
eric@2 130 bitmap = calloc (1, sizeof (Bitmap));
eric@2 131 if (! bitmap)
eric@2 132 return (NULL);
eric@42 133 bitmap->rect = * rect;
eric@43 134 bitmap->row_words = DIV_ROUND_UP (width, BITS_PER_WORD);
eric@43 135 bitmap->bits = calloc (1, height * bitmap->row_words * sizeof (word_type));
eric@2 136 if (! bitmap->bits)
eric@2 137 {
eric@2 138 free (bitmap);
eric@2 139 return (NULL);
eric@2 140 }
eric@2 141 return (bitmap);
eric@2 142 }
eric@2 143
eric@2 144 void free_bitmap (Bitmap *bitmap)
eric@2 145 {
eric@2 146 free (bitmap->bits);
eric@2 147 free (bitmap);
eric@2 148 }
eric@2 149
eric@2 150 boolean get_pixel (Bitmap *bitmap, Point coord)
eric@2 151 {
eric@43 152 word_type *p;
eric@47 153 int w,b;
eric@47 154
eric@42 155 if ((coord.x < bitmap->rect.min.x) ||
eric@42 156 (coord.x >= bitmap->rect.max.x) ||
eric@42 157 (coord.y < bitmap->rect.min.y) ||
eric@42 158 (coord.y >= bitmap->rect.max.y))
eric@2 159 return (0);
eric@47 160 coord.y -= bitmap->rect.min.y;
eric@47 161 coord.x -= bitmap->rect.min.x;
eric@47 162 w = coord.x / BITS_PER_WORD;
eric@47 163 b = coord.x & (BITS_PER_WORD - 1);
eric@47 164 p = bitmap->bits + coord.y * bitmap->row_words + w;
eric@47 165 return (((*p) & pixel_mask (b)) != 0);
eric@2 166 }
eric@2 167
eric@2 168 void set_pixel (Bitmap *bitmap, Point coord, boolean value)
eric@2 169 {
eric@43 170 word_type *p;
eric@47 171 int w,b;
eric@47 172
eric@42 173 if ((coord.x < bitmap->rect.min.x) ||
eric@42 174 (coord.x >= bitmap->rect.max.x) ||
eric@42 175 (coord.y < bitmap->rect.min.y) ||
eric@42 176 (coord.y >= bitmap->rect.max.y))
eric@2 177 return;
eric@47 178 coord.y -= bitmap->rect.min.y;
eric@47 179 coord.x -= bitmap->rect.min.x;
eric@47 180 w = coord.x / BITS_PER_WORD;
eric@47 181 b = coord.x & (BITS_PER_WORD - 1);
eric@47 182 p = bitmap->bits + coord.y * bitmap->row_words + w;
eric@2 183 if (value)
eric@47 184 (*p) |= pixel_mask (b);
eric@2 185 else
eric@47 186 (*p) &= ~pixel_mask (b);
eric@2 187 }
eric@2 188
eric@2 189
eric@42 190 /* modifies rect1 to be the intersection of rect1 and rect2;
eric@42 191 returns true if intersection is non-null */
eric@42 192 static boolean clip_rect (Rect *rect1, Rect *rect2)
eric@42 193 {
eric@42 194 if (rect1->min.y > rect2->max.y)
eric@42 195 goto empty;
eric@42 196 if (rect1->min.y < rect2->min.y)
eric@42 197 {
eric@42 198 if (rect1->max.y < rect2->max.y)
eric@42 199 goto empty;
eric@42 200 rect1->min.y = rect2->min.y;
eric@42 201 }
eric@42 202 if (rect1->max.y > rect2->max.y)
eric@42 203 rect1->max.y = rect2->max.y;
eric@42 204
eric@42 205 if (rect1->min.x > rect2->max.x)
eric@42 206 goto empty;
eric@42 207 if (rect1->min.x < rect2->min.x)
eric@42 208 {
eric@42 209 if (rect1->max.x < rect2->max.x)
eric@42 210 goto empty;
eric@42 211 rect1->min.x = rect2->min.x;
eric@42 212 }
eric@42 213 if (rect1->max.x > rect2->max.x)
eric@42 214 rect1->max.x = rect2->max.x;
eric@42 215
eric@42 216 empty:
eric@42 217 rect1->min.x = rect1->min.y =
eric@42 218 rect1->max.x = rect1->max.y = 0;
eric@42 219 return (0);
eric@42 220 }
eric@42 221
eric@42 222
eric@43 223 static void blt_background (Bitmap *dest_bitmap,
eric@47 224 Rect dest_rect)
eric@43 225 {
eric@47 226 u32 y;
eric@43 227 word_type *rp;
eric@47 228 u32 left_bit, left_word;
eric@47 229 u32 right_bit, right_word;
eric@47 230 word_type left_mask, right_mask;
eric@47 231 s32 word_count;
eric@43 232
eric@43 233 /* This function requires a non-null dest rect */
eric@47 234 assert (dest_rect.min.x < dest_rect.max.x);
eric@47 235 assert (dest_rect.min.y < dest_rect.max.y);
eric@43 236
eric@43 237 /* and that the rows of the dest rect lie entirely within the dest bitmap */
eric@47 238 assert (dest_rect.min.y >= dest_bitmap->rect.min.y);
eric@47 239 assert (dest_rect.max.y <= dest_bitmap->rect.max.y);
eric@43 240
eric@43 241 /* clip the x axis of the dest_rect to the bounds of the dest bitmap */
eric@47 242 if (dest_rect.min.x < dest_bitmap->rect.min.x)
eric@47 243 dest_rect.min.x = dest_bitmap->rect.min.x;
eric@47 244 if (dest_rect.max.x > dest_bitmap->rect.max.x)
eric@47 245 dest_rect.max.x = dest_bitmap->rect.max.x;
eric@47 246
eric@47 247 rp = dest_bitmap->bits +
eric@47 248 (dest_rect.min.y - dest_bitmap->rect.min.y) * dest_bitmap->row_words +
eric@47 249 (dest_rect.min.x - dest_bitmap->rect.min.x) / BITS_PER_WORD;
eric@47 250
eric@47 251 left_bit = dest_rect.min.x % BITS_PER_WORD;
eric@47 252 left_word = dest_rect.min.x / BITS_PER_WORD;
eric@47 253
eric@47 254 right_bit = (dest_rect.max.x - 1) % BITS_PER_WORD;
eric@47 255 right_word = (dest_rect.max.x - 1) / BITS_PER_WORD;
eric@47 256
eric@47 257 word_count = right_word + 1 - left_word;
eric@47 258
eric@47 259 /* special case if entire horizontal range fits in a single word */
eric@47 260 if (word_count == 1)
eric@47 261 {
eric@47 262 left_mask = 0;
eric@47 263 right_mask = ~ pixel_range_mask (left_bit, right_bit);
eric@47 264 word_count = 0;
eric@47 265 }
eric@47 266 else
eric@47 267 {
eric@47 268 if (left_bit)
eric@47 269 {
eric@47 270 left_mask = ~ pixel_range_mask (left_bit, BITS_PER_WORD - 1);
eric@47 271 word_count--;
eric@47 272 }
eric@43 273
eric@47 274 if (right_bit != (BITS_PER_WORD - 1))
eric@47 275 {
eric@47 276 right_mask = ~ pixel_range_mask (0, right_bit);
eric@47 277 word_count--;
eric@47 278 }
eric@47 279 }
eric@47 280
eric@47 281 for (y = 0; y < rect_height (& dest_rect); y++)
eric@43 282 {
eric@47 283 word_type *wp = rp;
eric@47 284
eric@47 285 /* partial word at left, if any */
eric@47 286 if (left_mask)
eric@47 287 *(wp++) &= left_mask;
eric@47 288
eric@47 289 /* use Duff's Device for the full words */
eric@47 290 if (word_count)
eric@47 291 {
eric@47 292 s32 i = word_count;
eric@47 293 switch (i % 8)
eric@47 294 {
eric@47 295 while (i > 0)
eric@47 296 {
eric@47 297 *(wp++) = 0;
eric@47 298 case 7: *(wp++) = 0;
eric@47 299 case 6: *(wp++) = 0;
eric@47 300 case 5: *(wp++) = 0;
eric@47 301 case 4: *(wp++) = 0;
eric@47 302 case 3: *(wp++) = 0;
eric@47 303 case 2: *(wp++) = 0;
eric@47 304 case 1: *(wp++) = 0;
eric@47 305 case 0: i -= 8;
eric@47 306 }
eric@47 307 }
eric@47 308 }
eric@47 309
eric@47 310 /* partial word at right, if any */
eric@47 311 if (right_mask)
eric@47 312 *wp &= right_mask;
eric@47 313
eric@47 314 /* advance to next row */
eric@43 315 rp += dest_bitmap->row_words;
eric@43 316 }
eric@43 317 }
eric@43 318
eric@43 319
eric@47 320 #if 0
eric@43 321 static void blt (Bitmap *src_bitmap,
eric@43 322 Rect *src_rect,
eric@43 323 Bitmap *dest_bitmap,
eric@43 324 Rect *dest_rect)
eric@43 325 {
eric@43 326 s32 y;
eric@43 327 word_type *rp;
eric@43 328
eric@43 329 /* This function requires a non-null src rect */
eric@43 330 assert (dest_rect->min.x < dest_rect->max.x);
eric@43 331 assert (dest_rect->min.y < dest_rect->max.y);
eric@43 332
eric@43 333 /* and a non-null dest rect */
eric@43 334 assert (dest_rect->min.x < dest_rect->max.x);
eric@43 335 assert (dest_rect->min.y < dest_rect->max.y);
eric@43 336
eric@43 337 /* and that the widths and heights of the rects match */
eric@43 338 assert (rect_width (src_rect) == rect_width (dest_rect));
eric@43 339 assert (rect_height (src_rect) == rect_height (dest_rect));
eric@43 340
eric@43 341 /* and that the rows of the src rect lie entirely within the src bitmap */
eric@43 342 assert (dest_rect->min.y >= dest_bitmap->rect->min.y);
eric@43 343 assert (dest_rect->max.y <= dest_bitmap->rect->max.y);
eric@43 344
eric@43 345 /* and that the rows of the dest rect lie entirely within the dest bitmap */
eric@43 346 assert (dest_rect->min.y >= dest_bitmap->rect->min.y);
eric@43 347 assert (dest_rect->max.y <= dest_bitmap->rect->max.y);
eric@43 348
eric@43 349 /* clip the x axis of the dest_rect to the bounds of the dest bitmap,
eric@43 350 and adjust the src_rect to match */
eric@43 351 if (dest_rect->min.x < dest_bitmap->rect.min.x)
eric@43 352 {
eric@43 353 src_rect->min.x += ???;
eric@43 354 dest_rect->min.x = dest_bitmap->rect.min.x;
eric@43 355 }
eric@43 356 if (dest_rect->max.x > dest_bitmap->rect.max.x)
eric@43 357 {
eric@43 358 dest_rect->max.x = dest_bitmap->rect.max.x;
eric@43 359 }
eric@43 360
eric@43 361 rp = ???;
eric@43 362 for (y = 0; y < rect_height (dest_rect); y++)
eric@43 363 {
eric@43 364 ???;
eric@43 365 rp += dest_bitmap->row_words;
eric@43 366 }
eric@43 367 }
eric@43 368
eric@43 369
eric@47 370 /*
eric@47 371 * The destination rectangle is first clipped to the dest bitmap, and
eric@47 372 * the source rectangle is adjusted in the corresponding manner.
eric@47 373 * What's left is divided into five sections, any of which may be
eric@47 374 * null. The portion that actually corresponds to the intersection of
eric@47 375 * the source rectangle and the source bitmpa is the "middle". The
eric@47 376 * other four sections will use the background color as the source
eric@47 377 * operand.
eric@47 378 *
eric@47 379 *
eric@47 380 * y0 -> -------------------------------------------------
eric@47 381 * | top |
eric@47 382 * | |
eric@47 383 * y1 -> -------------------------------------------------
eric@47 384 * | left | middle | right |
eric@47 385 * | | | |
eric@47 386 * y2 -> -------------------------------------------------
eric@47 387 * | bottom |
eric@47 388 * | |
eric@47 389 * y3 -> -------------------------------------------------
eric@47 390 *
eric@47 391 * ^ ^ ^ ^
eric@47 392 * | | | |
eric@47 393 * x0 x1 x2 x3
eric@47 394 *
eric@47 395 * */
eric@2 396 Bitmap *bitblt (Bitmap *src_bitmap,
eric@42 397 Rect *src_rect,
eric@2 398 Bitmap *dest_bitmap,
eric@42 399 Point *dest_min,
eric@43 400 int tfn,
eric@43 401 int background)
eric@43 402 {
eric@43 403 Rect sr, dr; /* src and dest rects, clipped to visible portion of
eric@43 404 dest rect */
eric@43 405 u32 drw, drh; /* dest rect width, height - gets adjusted */
eric@43 406 Point src_point, dest_point;
eric@43 407
eric@47 408 /* dest coordinates: */
eric@47 409 u32 x0, x1, x2, x3;
eric@47 410 u32 y0, y1, y2, y3;
eric@47 411
eric@43 412 {
eric@43 413 sr = * src_rect;
eric@43 414
eric@43 415 u32 srw = rect_width (& sr);
eric@43 416 u32 srh = rect_height (& sr);
eric@43 417
eric@43 418 if ((srw < 0) || (srh < 0))
eric@43 419 goto done; /* the source rect is empty! */
eric@43 420
eric@47 421 dr.min.x = dest_min->x;
eric@47 422 dr.min.y = dest_min->y;
eric@43 423 dr.max.x = dr.min.x + srw;
eric@43 424 dr.max.y = dr.min.y + srh;
eric@43 425 }
eric@43 426
eric@43 427 if (! dest_bitmap)
eric@43 428 {
eric@43 429 dest_bitmap = create_bitmap (& dr);
eric@43 430 if (! dest_bitmap)
eric@43 431 return (NULL);
eric@43 432 }
eric@43 433
eric@43 434 if ((dr.min.x >= dest_bitmap->rect.max.x) ||
eric@43 435 (dr.min.y >= dest_bitmap->rect.max.y))
eric@43 436 goto done; /* the dest rect isn't even in the dest bitmap! */
eric@43 437
eric@43 438 /* crop dest rect to dest bitmap */
eric@43 439 delta = dest_bitmap->rect.min.x - dr.min.x;
eric@43 440 if (delta > 0)
eric@43 441 {
eric@43 442 sr.min.x += delta;
eric@43 443 dr.min.x += delta;
eric@43 444 }
eric@43 445
eric@43 446 delta = dest_bitmap->rect.min.y - dr.min.y;
eric@43 447 if (delta > 0)
eric@43 448 {
eric@43 449 sr.min.y += delta;
eric@43 450 dr.min.y += delta;
eric@43 451 }
eric@43 452
eric@43 453 delta = dr.max.x - dest_bitmap->rect.max.x;
eric@43 454 if (delta > 0)
eric@43 455 {
eric@43 456 sr.max.x -= delta;
eric@43 457 dr.max.x -= delta;
eric@43 458 }
eric@43 459
eric@43 460 delta = dr.max.y - dest_bitmap->rect.max.y;
eric@43 461 if (delta > 0)
eric@43 462 {
eric@43 463 sr.max.x -= delta;
eric@43 464 dr.max.x -= delta;
eric@43 465 }
eric@43 466
eric@43 467 drw = rect_width (& dr);
eric@43 468 drh = rect_height (& dh);
eric@43 469
eric@47 470 x0 = dr.min.x;
eric@47 471 y0 = dr.min.y;
eric@47 472 x3 = dr.max.x;
eric@47 473 y3 = dr.max.y;
eric@47 474
eric@47 475 #if 0
eric@43 476 /* if the source rect min y is >= the source bitmap max y,
eric@43 477 we transfer background color to the entire dest rect */
eric@43 478 if (sr.min.y >= src->rect.max.y)
eric@43 479 {
eric@47 480 blt_background (dest_bitmap, dr);
eric@43 481 goto done;
eric@43 482 }
eric@47 483 #endif
eric@47 484
eric@47 485 /* top */
eric@47 486 if (y0 != y1)
eric@47 487 {
eric@47 488 dr2.min.x = x0;
eric@47 489 dr2.max.x = x3;
eric@47 490 dr2.min.y = y0;
eric@47 491 dr2.max.y = y1;
eric@47 492 blt_background (dest_bitmap, & dr2);
eric@47 493 }
eric@43 494
eric@47 495 /*
eric@47 496 * top: if the source rect min y is less than the source bitmap min y,
eric@47 497 * we need to transfer some backgound color to the top part of the dest
eric@47 498 * rect
eric@47 499 */
eric@43 500 if (sr.min.y < src->rect.min.y)
eric@43 501 {
eric@43 502 Rect dr2;
eric@43 503 uint32 bg_height;
eric@43 504
eric@43 505 bg_height = src->rect.min.y - sr.min.y;
eric@43 506 if (bg_height > sh)
eric@43 507 bg_height = sh;
eric@43 508
eric@43 509 dr2 = dr;
eric@43 510 dr2.max.y = dr2.min.y + bg_height;
eric@43 511
eric@43 512 blt_background (dest_bitmap, & dr2);
eric@43 513
eric@43 514 /* now reduce the rect height by the number of lines of background
eric@43 515 color */
eric@43 516 sr.min.y += bg_height;
eric@43 517 dr.min.y += bg_height;
eric@43 518 sh -= bg_height;
eric@43 519 dh -= bg_height;
eric@43 520
eric@43 521 if (sr.min.y == sr.max.y)
eric@43 522 goto done;
eric@43 523 }
eric@43 524
eric@47 525 if (y1 != y2)
eric@47 526 {
eric@47 527 /* left */
eric@47 528 if (x0 != x1)
eric@47 529 {
eric@47 530 dr2.min.x = x1;
eric@47 531 dr2.max.x = x1;
eric@47 532 dr2.min.y = y1;
eric@47 533 dr2.max.y = y2
eric@47 534 blt_background (dest_bitmap, & dr2);
eric@47 535 }
eric@47 536
eric@47 537 /* middle */
eric@47 538 if (x1 != x2)
eric@47 539 {
eric@47 540 /* ??? */
eric@47 541 }
eric@43 542
eric@47 543 /* right */
eric@47 544 if (x2 != x3)
eric@47 545 {
eric@47 546 dr2.min.x = x2;
eric@47 547 dr2.max.x = x3;
eric@47 548 dr2.min.y = y1;
eric@47 549 dr2.max.y = y2
eric@47 550 blt_background (dest_bitmap, & dr2);
eric@47 551 }
eric@47 552 }
eric@47 553
eric@47 554 /* bottom */
eric@47 555 if (y2 != y3)
eric@43 556 {
eric@47 557 dr2.min.x = x0;
eric@47 558 dr2.max.x = x3;
eric@47 559 dr2.min.y = y2;
eric@47 560 dr2.max.y = y3;
eric@47 561 blt_background (dest_bitmap, & dr2);
eric@43 562 }
eric@43 563
eric@43 564 done:
eric@43 565 return (dest_bitmap);
eric@43 566 }
eric@43 567 #else
eric@43 568 Bitmap *bitblt (Bitmap *src_bitmap,
eric@43 569 Rect *src_rect,
eric@43 570 Bitmap *dest_bitmap,
eric@43 571 Point *dest_min,
eric@43 572 int tfn,
eric@43 573 int background)
eric@2 574 {
eric@2 575 Point src_point, dest_point;
eric@2 576
eric@2 577 if (! dest_bitmap)
eric@2 578 {
eric@42 579 Rect dest_rect = {{ 0, 0 }, { dest_min->x + rect_width (src_rect),
eric@42 580 dest_min->y + rect_height (src_rect) }};
eric@42 581 dest_bitmap = create_bitmap (& dest_rect);
eric@2 582 if (! dest_bitmap)
eric@2 583 return (NULL);
eric@2 584 }
eric@2 585
eric@47 586 if (tfn == TF_SRC)
eric@2 587 {
eric@47 588 for (src_point.y = src_rect->min.y;
eric@47 589 src_point.y < src_rect->max.y;
eric@47 590 src_point.y++)
eric@2 591 {
eric@47 592 dest_point.y = dest_min->y + src_point.y - src_rect->min.y;
eric@47 593
eric@47 594 for (src_point.x = src_rect->min.x;
eric@47 595 src_point.x < src_rect->max.x;
eric@47 596 src_point.x++)
eric@47 597 {
eric@47 598 boolean a;
eric@2 599
eric@47 600 dest_point.x = dest_min->x + src_point.x - src_rect->min.x;
eric@3 601
eric@47 602 a = get_pixel (src_bitmap, src_point);
eric@47 603 set_pixel (dest_bitmap, dest_point, a);
eric@47 604 }
eric@47 605 }
eric@47 606 }
eric@47 607 else
eric@47 608 {
eric@47 609 for (src_point.y = src_rect->min.y;
eric@47 610 src_point.y < src_rect->max.y;
eric@47 611 src_point.y++)
eric@47 612 {
eric@47 613 dest_point.y = dest_min->y + src_point.y - src_rect->min.y;
eric@47 614
eric@47 615 for (src_point.x = src_rect->min.x;
eric@47 616 src_point.x < src_rect->max.x;
eric@47 617 src_point.x++)
eric@47 618 {
eric@47 619 boolean a, b, c;
eric@2 620
eric@47 621 dest_point.x = dest_min->x + src_point.x - src_rect->min.x;
eric@47 622
eric@47 623 a = get_pixel (src_bitmap, src_point);
eric@47 624 b = get_pixel (dest_bitmap, dest_point);
eric@47 625 c = (tfn & (1 << (a * 2 + b))) != 0;
eric@47 626
eric@47 627 set_pixel (dest_bitmap, dest_point, c);
eric@47 628 }
eric@2 629 }
eric@2 630 }
eric@2 631 return (dest_bitmap);
eric@2 632 }
eric@43 633 #endif
eric@42 634
eric@42 635
eric@42 636 /* in-place transformations */
eric@42 637 void flip_h (Bitmap *src)
eric@42 638 {
eric@43 639 word_type *rp; /* row pointer */
eric@43 640 word_type *p1; /* work src ptr */
eric@43 641 word_type *p2; /* work dest ptr */
eric@42 642 s32 y;
eric@43 643 int shift1, shift2;
eric@42 644
eric@43 645 realloc_temp_buffer ((src->row_words + 1) * sizeof (word_type));
eric@42 646
eric@42 647 rp = src->bits;
eric@42 648 if ((rect_width (& src->rect) & 7) == 0)
eric@42 649 {
eric@42 650 for (y = src->rect.min.y; y < src->rect.max.y; y++)
eric@42 651 {
eric@43 652 memcpy (temp_buffer, rp, src->row_words * sizeof (word_type));
eric@43 653 p1 = temp_buffer + src->row_words;
eric@42 654 p2 = rp;
eric@42 655
eric@42 656 while (p1 >= temp_buffer)
eric@43 657 *(p2++) = bit_reverse_word (*(p1--));
eric@42 658
eric@43 659 rp += src->row_words;
eric@42 660 }
eric@42 661 return;
eric@42 662 }
eric@42 663
eric@42 664 temp_buffer [0] = 0;
eric@43 665 shift1 = rect_width (& src->rect) & (BITS_PER_WORD - 1);
eric@43 666 shift2 = BITS_PER_WORD - shift1;
eric@42 667
eric@42 668 for (y = src->rect.min.y; y < src->rect.max.y; y++)
eric@42 669 {
eric@43 670 word_type d1, d2;
eric@43 671
eric@43 672 memcpy (temp_buffer + 1, rp, src->row_words * sizeof (word_type));
eric@43 673 p1 = temp_buffer + src->row_words;
eric@42 674 p2 = rp;
eric@42 675
eric@43 676 d2 = *(p1--);
eric@42 677
eric@42 678 while (p1 >= temp_buffer)
eric@42 679 {
eric@43 680 d1 = *(p1--);
eric@43 681 *(p2++) = bit_reverse_word ((d1 << shift1) | (d2 >> shift2));
eric@43 682 d2 = d1;
eric@42 683 }
eric@42 684
eric@43 685 rp += src->row_words;
eric@42 686 }
eric@42 687 }
eric@42 688
eric@42 689 void flip_v (Bitmap *src)
eric@42 690 {
eric@43 691 word_type *p1, *p2;
eric@42 692
eric@43 693 realloc_temp_buffer (src->row_words * sizeof (word_type));
eric@42 694
eric@42 695 p1 = src->bits;
eric@43 696 p2 = src->bits + src->row_words * (rect_height (& src->rect) - 1);
eric@42 697 while (p1 < p2)
eric@42 698 {
eric@43 699 memcpy (temp_buffer, p1, src->row_words * sizeof (word_type));
eric@43 700 memcpy (p1, p2, src->row_words * sizeof (word_type));
eric@43 701 memcpy (p2, temp_buffer, src->row_words * sizeof (word_type));
eric@43 702 p1 += src->row_words;
eric@43 703 p2 -= src->row_words;
eric@42 704 }
eric@42 705 }
eric@42 706
eric@42 707 void rot_180 (Bitmap *src) /* combination of flip_h and flip_v */
eric@42 708 {
eric@42 709 flip_h (src);
eric@42 710 flip_v (src);
eric@42 711 }
eric@42 712
eric@42 713 /* "in-place" transformations - will allocate new memory and free old */
eric@42 714 void transpose (Bitmap *src)
eric@42 715 {
eric@43 716 u32 new_row_words = DIV_ROUND_UP (rect_height (& src->rect), 32);
eric@43 717 word_type *new_bits;
eric@42 718
eric@43 719 new_bits = calloc (1, new_row_words * rect_width (& src->rect) * sizeof (word_type));
eric@42 720
eric@42 721 /* $$$ more code needed here */
eric@42 722 }
eric@42 723
eric@42 724 void rot_90 (Bitmap *src) /* transpose + flip_h */
eric@42 725 {
eric@42 726 transpose (src);
eric@42 727 flip_h (src);
eric@42 728 }
eric@42 729
eric@42 730 void rot_270 (Bitmap *src) /* transpose + flip_v */
eric@42 731 {
eric@42 732 transpose (src);
eric@42 733 flip_v (src);
eric@42 734 }