Tue, 22 Jan 2002 09:42:42 +0000
*** empty log message ***
eric@42 | 1 | #include <stdio.h> |
eric@2 | 2 | #include <stdlib.h> |
eric@42 | 3 | #include <string.h> |
eric@2 | 4 | |
eric@11 | 5 | #include "type.h" |
eric@2 | 6 | #include "bitblt.h" |
eric@2 | 7 | |
eric@42 | 8 | |
eric@43 | 9 | #define DIV_ROUND_UP(count,pow2) (((count) - 1) / (pow2) + 1) |
eric@42 | 10 | |
eric@42 | 11 | |
eric@42 | 12 | static const u8 bit_reverse_byte [0x100] = |
eric@42 | 13 | { |
eric@42 | 14 | 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, |
eric@42 | 15 | 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, |
eric@42 | 16 | 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, |
eric@42 | 17 | 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, |
eric@42 | 18 | 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, |
eric@42 | 19 | 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, |
eric@42 | 20 | 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, |
eric@42 | 21 | 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, |
eric@42 | 22 | 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, |
eric@42 | 23 | 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, |
eric@42 | 24 | 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, |
eric@42 | 25 | 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, |
eric@42 | 26 | 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, |
eric@42 | 27 | 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, |
eric@42 | 28 | 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, |
eric@42 | 29 | 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, |
eric@42 | 30 | 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, |
eric@42 | 31 | 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, |
eric@42 | 32 | 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, |
eric@42 | 33 | 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, |
eric@42 | 34 | 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, |
eric@42 | 35 | 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, |
eric@42 | 36 | 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, |
eric@42 | 37 | 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, |
eric@42 | 38 | 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, |
eric@42 | 39 | 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, |
eric@42 | 40 | 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, |
eric@42 | 41 | 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, |
eric@42 | 42 | 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, |
eric@42 | 43 | 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, |
eric@42 | 44 | 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, |
eric@42 | 45 | 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff |
eric@42 | 46 | }; |
eric@42 | 47 | |
eric@43 | 48 | static word_type bit_reverse_word (word_type d) |
eric@43 | 49 | { |
eric@43 | 50 | return (bit_reverse_byte [d >> 24] | |
eric@43 | 51 | (bit_reverse_byte [(d >> 16) & 0xff] << 8) | |
eric@43 | 52 | (bit_reverse_byte [(d >> 8) & 0xff] << 16) | |
eric@43 | 53 | (bit_reverse_byte [d & 0xff] << 24)); |
eric@43 | 54 | } |
eric@42 | 55 | |
eric@43 | 56 | |
eric@43 | 57 | static u32 *temp_buffer; |
eric@42 | 58 | static u32 temp_buffer_size; |
eric@42 | 59 | |
eric@42 | 60 | static void realloc_temp_buffer (u32 size) |
eric@42 | 61 | { |
eric@42 | 62 | if (size <= temp_buffer_size) |
eric@42 | 63 | return; |
eric@42 | 64 | temp_buffer = realloc (temp_buffer, size); |
eric@42 | 65 | if (! temp_buffer) |
eric@42 | 66 | { |
eric@42 | 67 | fprintf (stderr, "realloc failed in bitblt library\n"); |
eric@42 | 68 | exit (2); |
eric@42 | 69 | } |
eric@42 | 70 | temp_buffer_size = size; |
eric@42 | 71 | } |
eric@42 | 72 | |
eric@42 | 73 | |
eric@43 | 74 | static inline word_type pixel_mask (x) |
eric@2 | 75 | { |
eric@2 | 76 | #ifdef LSB_LEFT |
eric@2 | 77 | return (1 << x); |
eric@2 | 78 | #else |
eric@43 | 79 | return (1 << ((BITS_PER_WORD - 1) - x)); |
eric@2 | 80 | #endif |
eric@42 | 81 | }; |
eric@2 | 82 | |
eric@42 | 83 | Bitmap *create_bitmap (Rect *rect) |
eric@2 | 84 | { |
eric@2 | 85 | Bitmap *bitmap; |
eric@42 | 86 | u32 width = rect_width (rect); |
eric@42 | 87 | u32 height = rect_height (rect); |
eric@2 | 88 | |
eric@35 | 89 | if ((width <= 0) || (height <= 0)) |
eric@35 | 90 | return (NULL); |
eric@35 | 91 | |
eric@2 | 92 | bitmap = calloc (1, sizeof (Bitmap)); |
eric@2 | 93 | if (! bitmap) |
eric@2 | 94 | return (NULL); |
eric@42 | 95 | bitmap->rect = * rect; |
eric@43 | 96 | bitmap->row_words = DIV_ROUND_UP (width, BITS_PER_WORD); |
eric@43 | 97 | bitmap->bits = calloc (1, height * bitmap->row_words * sizeof (word_type)); |
eric@2 | 98 | if (! bitmap->bits) |
eric@2 | 99 | { |
eric@2 | 100 | free (bitmap); |
eric@2 | 101 | return (NULL); |
eric@2 | 102 | } |
eric@2 | 103 | return (bitmap); |
eric@2 | 104 | } |
eric@2 | 105 | |
eric@2 | 106 | void free_bitmap (Bitmap *bitmap) |
eric@2 | 107 | { |
eric@2 | 108 | free (bitmap->bits); |
eric@2 | 109 | free (bitmap); |
eric@2 | 110 | } |
eric@2 | 111 | |
eric@2 | 112 | boolean get_pixel (Bitmap *bitmap, Point coord) |
eric@2 | 113 | { |
eric@43 | 114 | word_type *p; |
eric@42 | 115 | if ((coord.x < bitmap->rect.min.x) || |
eric@42 | 116 | (coord.x >= bitmap->rect.max.x) || |
eric@42 | 117 | (coord.y < bitmap->rect.min.y) || |
eric@42 | 118 | (coord.y >= bitmap->rect.max.y)) |
eric@2 | 119 | return (0); |
eric@42 | 120 | p = bitmap->bits + |
eric@43 | 121 | (coord.y - bitmap->rect.min.y) * bitmap->row_words + |
eric@43 | 122 | (coord.x - bitmap->rect.min.x) / BITS_PER_WORD; |
eric@43 | 123 | return ((*p & pixel_mask (coord.x & (BITS_PER_WORD - 1))) != 0); |
eric@2 | 124 | } |
eric@2 | 125 | |
eric@2 | 126 | void set_pixel (Bitmap *bitmap, Point coord, boolean value) |
eric@2 | 127 | { |
eric@43 | 128 | word_type *p; |
eric@42 | 129 | if ((coord.x < bitmap->rect.min.x) || |
eric@42 | 130 | (coord.x >= bitmap->rect.max.x) || |
eric@42 | 131 | (coord.y < bitmap->rect.min.y) || |
eric@42 | 132 | (coord.y >= bitmap->rect.max.y)) |
eric@2 | 133 | return; |
eric@42 | 134 | p = bitmap->bits + |
eric@43 | 135 | (coord.y - bitmap->rect.min.y) * bitmap->row_words + |
eric@43 | 136 | (coord.x - bitmap->rect.min.x) / BITS_PER_WORD; |
eric@2 | 137 | if (value) |
eric@43 | 138 | *p |= pixel_mask (coord.x & (BITS_PER_WORD - 1)); |
eric@2 | 139 | else |
eric@43 | 140 | *p &= ~pixel_mask (coord.x & (BITS_PER_WORD - 1)); |
eric@2 | 141 | } |
eric@2 | 142 | |
eric@2 | 143 | |
eric@42 | 144 | /* modifies rect1 to be the intersection of rect1 and rect2; |
eric@42 | 145 | returns true if intersection is non-null */ |
eric@42 | 146 | static boolean clip_rect (Rect *rect1, Rect *rect2) |
eric@42 | 147 | { |
eric@42 | 148 | if (rect1->min.y > rect2->max.y) |
eric@42 | 149 | goto empty; |
eric@42 | 150 | if (rect1->min.y < rect2->min.y) |
eric@42 | 151 | { |
eric@42 | 152 | if (rect1->max.y < rect2->max.y) |
eric@42 | 153 | goto empty; |
eric@42 | 154 | rect1->min.y = rect2->min.y; |
eric@42 | 155 | } |
eric@42 | 156 | if (rect1->max.y > rect2->max.y) |
eric@42 | 157 | rect1->max.y = rect2->max.y; |
eric@42 | 158 | |
eric@42 | 159 | if (rect1->min.x > rect2->max.x) |
eric@42 | 160 | goto empty; |
eric@42 | 161 | if (rect1->min.x < rect2->min.x) |
eric@42 | 162 | { |
eric@42 | 163 | if (rect1->max.x < rect2->max.x) |
eric@42 | 164 | goto empty; |
eric@42 | 165 | rect1->min.x = rect2->min.x; |
eric@42 | 166 | } |
eric@42 | 167 | if (rect1->max.x > rect2->max.x) |
eric@42 | 168 | rect1->max.x = rect2->max.x; |
eric@42 | 169 | |
eric@42 | 170 | empty: |
eric@42 | 171 | rect1->min.x = rect1->min.y = |
eric@42 | 172 | rect1->max.x = rect1->max.y = 0; |
eric@42 | 173 | return (0); |
eric@42 | 174 | } |
eric@42 | 175 | |
eric@42 | 176 | |
eric@43 | 177 | #if 0 |
eric@43 | 178 | static void blt_background (Bitmap *dest_bitmap, |
eric@43 | 179 | Rect *dest_rect) |
eric@43 | 180 | { |
eric@43 | 181 | s32 y; |
eric@43 | 182 | word_type *rp; |
eric@43 | 183 | |
eric@43 | 184 | /* This function requires a non-null dest rect */ |
eric@43 | 185 | assert (dest_rect->min.x < dest_rect->max.x); |
eric@43 | 186 | assert (dest_rect->min.y < dest_rect->max.y); |
eric@43 | 187 | |
eric@43 | 188 | /* and that the rows of the dest rect lie entirely within the dest bitmap */ |
eric@43 | 189 | assert (dest_rect->min.y >= dest_bitmap->rect->min.y); |
eric@43 | 190 | assert (dest_rect->max.y <= dest_bitmap->rect->max.y); |
eric@43 | 191 | |
eric@43 | 192 | /* clip the x axis of the dest_rect to the bounds of the dest bitmap */ |
eric@43 | 193 | if (dest_rect->min.x < dest_bitmap->rect.min.x) |
eric@43 | 194 | dest_rect->min.x = dest_bitmap->rect.min.x; |
eric@43 | 195 | if (dest_rect->max.x > dest_bitmap->rect.max.x) |
eric@43 | 196 | dest_rect->max.x = dest_bitmap->rect.max.x; |
eric@43 | 197 | |
eric@43 | 198 | rp = ???; |
eric@43 | 199 | for (y = 0; y < rect_height (dest_rect); y++) |
eric@43 | 200 | { |
eric@43 | 201 | ???; |
eric@43 | 202 | rp += dest_bitmap->row_words; |
eric@43 | 203 | } |
eric@43 | 204 | } |
eric@43 | 205 | |
eric@43 | 206 | |
eric@43 | 207 | static void blt (Bitmap *src_bitmap, |
eric@43 | 208 | Rect *src_rect, |
eric@43 | 209 | Bitmap *dest_bitmap, |
eric@43 | 210 | Rect *dest_rect) |
eric@43 | 211 | { |
eric@43 | 212 | s32 y; |
eric@43 | 213 | word_type *rp; |
eric@43 | 214 | |
eric@43 | 215 | /* This function requires a non-null src rect */ |
eric@43 | 216 | assert (dest_rect->min.x < dest_rect->max.x); |
eric@43 | 217 | assert (dest_rect->min.y < dest_rect->max.y); |
eric@43 | 218 | |
eric@43 | 219 | /* and a non-null dest rect */ |
eric@43 | 220 | assert (dest_rect->min.x < dest_rect->max.x); |
eric@43 | 221 | assert (dest_rect->min.y < dest_rect->max.y); |
eric@43 | 222 | |
eric@43 | 223 | /* and that the widths and heights of the rects match */ |
eric@43 | 224 | assert (rect_width (src_rect) == rect_width (dest_rect)); |
eric@43 | 225 | assert (rect_height (src_rect) == rect_height (dest_rect)); |
eric@43 | 226 | |
eric@43 | 227 | /* and that the rows of the src rect lie entirely within the src bitmap */ |
eric@43 | 228 | assert (dest_rect->min.y >= dest_bitmap->rect->min.y); |
eric@43 | 229 | assert (dest_rect->max.y <= dest_bitmap->rect->max.y); |
eric@43 | 230 | |
eric@43 | 231 | /* and that the rows of the dest rect lie entirely within the dest bitmap */ |
eric@43 | 232 | assert (dest_rect->min.y >= dest_bitmap->rect->min.y); |
eric@43 | 233 | assert (dest_rect->max.y <= dest_bitmap->rect->max.y); |
eric@43 | 234 | |
eric@43 | 235 | /* clip the x axis of the dest_rect to the bounds of the dest bitmap, |
eric@43 | 236 | and adjust the src_rect to match */ |
eric@43 | 237 | if (dest_rect->min.x < dest_bitmap->rect.min.x) |
eric@43 | 238 | { |
eric@43 | 239 | src_rect->min.x += ???; |
eric@43 | 240 | dest_rect->min.x = dest_bitmap->rect.min.x; |
eric@43 | 241 | } |
eric@43 | 242 | if (dest_rect->max.x > dest_bitmap->rect.max.x) |
eric@43 | 243 | { |
eric@43 | 244 | dest_rect->max.x = dest_bitmap->rect.max.x; |
eric@43 | 245 | } |
eric@43 | 246 | |
eric@43 | 247 | rp = ???; |
eric@43 | 248 | for (y = 0; y < rect_height (dest_rect); y++) |
eric@43 | 249 | { |
eric@43 | 250 | ???; |
eric@43 | 251 | rp += dest_bitmap->row_words; |
eric@43 | 252 | } |
eric@43 | 253 | } |
eric@43 | 254 | |
eric@43 | 255 | |
eric@2 | 256 | Bitmap *bitblt (Bitmap *src_bitmap, |
eric@42 | 257 | Rect *src_rect, |
eric@2 | 258 | Bitmap *dest_bitmap, |
eric@42 | 259 | Point *dest_min, |
eric@43 | 260 | int tfn, |
eric@43 | 261 | int background) |
eric@43 | 262 | { |
eric@43 | 263 | Rect sr, dr; /* src and dest rects, clipped to visible portion of |
eric@43 | 264 | dest rect */ |
eric@43 | 265 | u32 drw, drh; /* dest rect width, height - gets adjusted */ |
eric@43 | 266 | Point src_point, dest_point; |
eric@43 | 267 | |
eric@43 | 268 | { |
eric@43 | 269 | sr = * src_rect; |
eric@43 | 270 | |
eric@43 | 271 | u32 srw = rect_width (& sr); |
eric@43 | 272 | u32 srh = rect_height (& sr); |
eric@43 | 273 | |
eric@43 | 274 | if ((srw < 0) || (srh < 0)) |
eric@43 | 275 | goto done; /* the source rect is empty! */ |
eric@43 | 276 | |
eric@43 | 277 | dr.min = * dest_min; |
eric@43 | 278 | dr.max.x = dr.min.x + srw; |
eric@43 | 279 | dr.max.y = dr.min.y + srh; |
eric@43 | 280 | } |
eric@43 | 281 | |
eric@43 | 282 | if (! dest_bitmap) |
eric@43 | 283 | { |
eric@43 | 284 | dest_bitmap = create_bitmap (& dr); |
eric@43 | 285 | if (! dest_bitmap) |
eric@43 | 286 | return (NULL); |
eric@43 | 287 | } |
eric@43 | 288 | |
eric@43 | 289 | if ((dr.min.x >= dest_bitmap->rect.max.x) || |
eric@43 | 290 | (dr.min.y >= dest_bitmap->rect.max.y)) |
eric@43 | 291 | goto done; /* the dest rect isn't even in the dest bitmap! */ |
eric@43 | 292 | |
eric@43 | 293 | /* crop dest rect to dest bitmap */ |
eric@43 | 294 | |
eric@43 | 295 | delta = dest_bitmap->rect.min.x - dr.min.x; |
eric@43 | 296 | if (delta > 0) |
eric@43 | 297 | { |
eric@43 | 298 | sr.min.x += delta; |
eric@43 | 299 | dr.min.x += delta; |
eric@43 | 300 | } |
eric@43 | 301 | |
eric@43 | 302 | delta = dest_bitmap->rect.min.y - dr.min.y; |
eric@43 | 303 | if (delta > 0) |
eric@43 | 304 | { |
eric@43 | 305 | sr.min.y += delta; |
eric@43 | 306 | dr.min.y += delta; |
eric@43 | 307 | } |
eric@43 | 308 | |
eric@43 | 309 | delta = dr.max.x - dest_bitmap->rect.max.x; |
eric@43 | 310 | if (delta > 0) |
eric@43 | 311 | { |
eric@43 | 312 | sr.max.x -= delta; |
eric@43 | 313 | dr.max.x -= delta; |
eric@43 | 314 | } |
eric@43 | 315 | |
eric@43 | 316 | delta = dr.max.y - dest_bitmap->rect.max.y; |
eric@43 | 317 | if (delta > 0) |
eric@43 | 318 | { |
eric@43 | 319 | sr.max.x -= delta; |
eric@43 | 320 | dr.max.x -= delta; |
eric@43 | 321 | } |
eric@43 | 322 | |
eric@43 | 323 | drw = rect_width (& dr); |
eric@43 | 324 | drh = rect_height (& dh); |
eric@43 | 325 | |
eric@43 | 326 | /* if the source rect min y is >= the source bitmap max y, |
eric@43 | 327 | we transfer background color to the entire dest rect */ |
eric@43 | 328 | if (sr.min.y >= src->rect.max.y) |
eric@43 | 329 | { |
eric@43 | 330 | blt_background (dest_bitmap, & dr); |
eric@43 | 331 | goto done; |
eric@43 | 332 | } |
eric@43 | 333 | |
eric@43 | 334 | /* if the source rect min y is less than the source bitmap min y, |
eric@43 | 335 | we need to transfer some backgound color to the top part of the dest |
eric@43 | 336 | rect */ |
eric@43 | 337 | if (sr.min.y < src->rect.min.y) |
eric@43 | 338 | { |
eric@43 | 339 | Rect dr2; |
eric@43 | 340 | uint32 bg_height; |
eric@43 | 341 | |
eric@43 | 342 | bg_height = src->rect.min.y - sr.min.y; |
eric@43 | 343 | if (bg_height > sh) |
eric@43 | 344 | bg_height = sh; |
eric@43 | 345 | |
eric@43 | 346 | dr2 = dr; |
eric@43 | 347 | dr2.max.y = dr2.min.y + bg_height; |
eric@43 | 348 | |
eric@43 | 349 | blt_background (dest_bitmap, & dr2); |
eric@43 | 350 | |
eric@43 | 351 | /* now reduce the rect height by the number of lines of background |
eric@43 | 352 | color */ |
eric@43 | 353 | sr.min.y += bg_height; |
eric@43 | 354 | dr.min.y += bg_height; |
eric@43 | 355 | sh -= bg_height; |
eric@43 | 356 | dh -= bg_height; |
eric@43 | 357 | |
eric@43 | 358 | if (sr.min.y == sr.max.y) |
eric@43 | 359 | goto done; |
eric@43 | 360 | } |
eric@43 | 361 | |
eric@43 | 362 | /* now blt the available rows of the source rect */ |
eric@43 | 363 | |
eric@43 | 364 | /* now transfer the background color to any remaining rows of the |
eric@43 | 365 | dest rect */ |
eric@43 | 366 | if (??? ) |
eric@43 | 367 | { |
eric@43 | 368 | blt_background (dest_bitmap, & dr); |
eric@43 | 369 | } |
eric@43 | 370 | |
eric@43 | 371 | done: |
eric@43 | 372 | return (dest_bitmap); |
eric@43 | 373 | } |
eric@43 | 374 | #else |
eric@43 | 375 | Bitmap *bitblt (Bitmap *src_bitmap, |
eric@43 | 376 | Rect *src_rect, |
eric@43 | 377 | Bitmap *dest_bitmap, |
eric@43 | 378 | Point *dest_min, |
eric@43 | 379 | int tfn, |
eric@43 | 380 | int background) |
eric@2 | 381 | { |
eric@2 | 382 | Point src_point, dest_point; |
eric@2 | 383 | |
eric@2 | 384 | if (! dest_bitmap) |
eric@2 | 385 | { |
eric@42 | 386 | Rect dest_rect = {{ 0, 0 }, { dest_min->x + rect_width (src_rect), |
eric@42 | 387 | dest_min->y + rect_height (src_rect) }}; |
eric@42 | 388 | dest_bitmap = create_bitmap (& dest_rect); |
eric@2 | 389 | if (! dest_bitmap) |
eric@2 | 390 | return (NULL); |
eric@2 | 391 | } |
eric@2 | 392 | |
eric@42 | 393 | for (src_point.y = src_rect->min.y; |
eric@42 | 394 | src_point.y < src_rect->max.y; |
eric@2 | 395 | src_point.y++) |
eric@2 | 396 | { |
eric@42 | 397 | dest_point.y = dest_min->y + src_point.y - src_rect->min.y; |
eric@42 | 398 | |
eric@42 | 399 | for (src_point.x = src_rect->min.x; |
eric@42 | 400 | src_point.x < src_rect->max.x; |
eric@2 | 401 | src_point.x++) |
eric@2 | 402 | { |
eric@2 | 403 | boolean a, b, c; |
eric@2 | 404 | |
eric@42 | 405 | dest_point.x = dest_min->x + src_point.x - src_rect->min.x; |
eric@3 | 406 | |
eric@2 | 407 | a = get_pixel (src_bitmap, src_point); |
eric@2 | 408 | b = get_pixel (dest_bitmap, dest_point); |
eric@2 | 409 | c = (tfn & (1 << (a * 2 + b))) != 0; |
eric@2 | 410 | |
eric@2 | 411 | set_pixel (dest_bitmap, dest_point, c); |
eric@2 | 412 | } |
eric@2 | 413 | } |
eric@2 | 414 | return (dest_bitmap); |
eric@2 | 415 | } |
eric@43 | 416 | #endif |
eric@42 | 417 | |
eric@42 | 418 | |
eric@42 | 419 | /* in-place transformations */ |
eric@42 | 420 | void flip_h (Bitmap *src) |
eric@42 | 421 | { |
eric@43 | 422 | word_type *rp; /* row pointer */ |
eric@43 | 423 | word_type *p1; /* work src ptr */ |
eric@43 | 424 | word_type *p2; /* work dest ptr */ |
eric@42 | 425 | s32 y; |
eric@43 | 426 | int shift1, shift2; |
eric@42 | 427 | |
eric@43 | 428 | realloc_temp_buffer ((src->row_words + 1) * sizeof (word_type)); |
eric@42 | 429 | |
eric@42 | 430 | rp = src->bits; |
eric@42 | 431 | if ((rect_width (& src->rect) & 7) == 0) |
eric@42 | 432 | { |
eric@42 | 433 | for (y = src->rect.min.y; y < src->rect.max.y; y++) |
eric@42 | 434 | { |
eric@43 | 435 | memcpy (temp_buffer, rp, src->row_words * sizeof (word_type)); |
eric@43 | 436 | p1 = temp_buffer + src->row_words; |
eric@42 | 437 | p2 = rp; |
eric@42 | 438 | |
eric@42 | 439 | while (p1 >= temp_buffer) |
eric@43 | 440 | *(p2++) = bit_reverse_word (*(p1--)); |
eric@42 | 441 | |
eric@43 | 442 | rp += src->row_words; |
eric@42 | 443 | } |
eric@42 | 444 | return; |
eric@42 | 445 | } |
eric@42 | 446 | |
eric@42 | 447 | temp_buffer [0] = 0; |
eric@43 | 448 | shift1 = rect_width (& src->rect) & (BITS_PER_WORD - 1); |
eric@43 | 449 | shift2 = BITS_PER_WORD - shift1; |
eric@42 | 450 | |
eric@42 | 451 | for (y = src->rect.min.y; y < src->rect.max.y; y++) |
eric@42 | 452 | { |
eric@43 | 453 | word_type d1, d2; |
eric@43 | 454 | |
eric@43 | 455 | memcpy (temp_buffer + 1, rp, src->row_words * sizeof (word_type)); |
eric@43 | 456 | p1 = temp_buffer + src->row_words; |
eric@42 | 457 | p2 = rp; |
eric@42 | 458 | |
eric@43 | 459 | d2 = *(p1--); |
eric@42 | 460 | |
eric@42 | 461 | while (p1 >= temp_buffer) |
eric@42 | 462 | { |
eric@43 | 463 | d1 = *(p1--); |
eric@43 | 464 | *(p2++) = bit_reverse_word ((d1 << shift1) | (d2 >> shift2)); |
eric@43 | 465 | d2 = d1; |
eric@42 | 466 | } |
eric@42 | 467 | |
eric@43 | 468 | rp += src->row_words; |
eric@42 | 469 | } |
eric@42 | 470 | } |
eric@42 | 471 | |
eric@42 | 472 | void flip_v (Bitmap *src) |
eric@42 | 473 | { |
eric@43 | 474 | word_type *p1, *p2; |
eric@42 | 475 | |
eric@43 | 476 | realloc_temp_buffer (src->row_words * sizeof (word_type)); |
eric@42 | 477 | |
eric@42 | 478 | p1 = src->bits; |
eric@43 | 479 | p2 = src->bits + src->row_words * (rect_height (& src->rect) - 1); |
eric@42 | 480 | while (p1 < p2) |
eric@42 | 481 | { |
eric@43 | 482 | memcpy (temp_buffer, p1, src->row_words * sizeof (word_type)); |
eric@43 | 483 | memcpy (p1, p2, src->row_words * sizeof (word_type)); |
eric@43 | 484 | memcpy (p2, temp_buffer, src->row_words * sizeof (word_type)); |
eric@43 | 485 | p1 += src->row_words; |
eric@43 | 486 | p2 -= src->row_words; |
eric@42 | 487 | } |
eric@42 | 488 | } |
eric@42 | 489 | |
eric@42 | 490 | void rot_180 (Bitmap *src) /* combination of flip_h and flip_v */ |
eric@42 | 491 | { |
eric@42 | 492 | flip_h (src); |
eric@42 | 493 | flip_v (src); |
eric@42 | 494 | } |
eric@42 | 495 | |
eric@42 | 496 | /* "in-place" transformations - will allocate new memory and free old */ |
eric@42 | 497 | void transpose (Bitmap *src) |
eric@42 | 498 | { |
eric@43 | 499 | u32 new_row_words = DIV_ROUND_UP (rect_height (& src->rect), 32); |
eric@43 | 500 | word_type *new_bits; |
eric@42 | 501 | |
eric@43 | 502 | new_bits = calloc (1, new_row_words * rect_width (& src->rect) * sizeof (word_type)); |
eric@42 | 503 | |
eric@42 | 504 | /* $$$ more code needed here */ |
eric@42 | 505 | } |
eric@42 | 506 | |
eric@42 | 507 | void rot_90 (Bitmap *src) /* transpose + flip_h */ |
eric@42 | 508 | { |
eric@42 | 509 | transpose (src); |
eric@42 | 510 | flip_h (src); |
eric@42 | 511 | } |
eric@42 | 512 | |
eric@42 | 513 | void rot_270 (Bitmap *src) /* transpose + flip_v */ |
eric@42 | 514 | { |
eric@42 | 515 | transpose (src); |
eric@42 | 516 | flip_v (src); |
eric@42 | 517 | } |