bitblt.c

Wed, 02 Jan 2002 16:39:39 +0000

author
eric
date
Wed, 02 Jan 2002 16:39:39 +0000
changeset 42
9c85a4cd88a3
parent 35
41804cc569ab
child 43
b80cb5a4282a
permissions
-rw-r--r--

started work on bitblt optimization - split rotate functions from bitblt.

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@42 9 #define CALC_ROWBYTES(width) (((width) - 1) / 8 + 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@42 48
eric@42 49 static u8 *temp_buffer;
eric@42 50 static u32 temp_buffer_size;
eric@42 51
eric@42 52 static void realloc_temp_buffer (u32 size)
eric@42 53 {
eric@42 54 if (size <= temp_buffer_size)
eric@42 55 return;
eric@42 56 temp_buffer = realloc (temp_buffer, size);
eric@42 57 if (! temp_buffer)
eric@42 58 {
eric@42 59 fprintf (stderr, "realloc failed in bitblt library\n");
eric@42 60 exit (2);
eric@42 61 }
eric@42 62 temp_buffer_size = size;
eric@42 63 }
eric@42 64
eric@42 65
eric@2 66 static inline u8 pixel_mask (x)
eric@2 67 {
eric@2 68 #ifdef LSB_LEFT
eric@2 69 return (1 << x);
eric@2 70 #else
eric@2 71 return (1 << (7 - x));
eric@2 72 #endif
eric@42 73 };
eric@2 74
eric@42 75 Bitmap *create_bitmap (Rect *rect)
eric@2 76 {
eric@2 77 Bitmap *bitmap;
eric@42 78 u32 width = rect_width (rect);
eric@42 79 u32 height = rect_height (rect);
eric@2 80
eric@35 81 if ((width <= 0) || (height <= 0))
eric@35 82 return (NULL);
eric@35 83
eric@2 84 bitmap = calloc (1, sizeof (Bitmap));
eric@2 85 if (! bitmap)
eric@2 86 return (NULL);
eric@42 87 bitmap->rect = * rect;
eric@42 88 bitmap->rowbytes = CALC_ROWBYTES (width);
eric@2 89 bitmap->bits = calloc (height * bitmap->rowbytes, 1);
eric@2 90 if (! bitmap->bits)
eric@2 91 {
eric@2 92 free (bitmap);
eric@2 93 return (NULL);
eric@2 94 }
eric@2 95 return (bitmap);
eric@2 96 }
eric@2 97
eric@2 98 void free_bitmap (Bitmap *bitmap)
eric@2 99 {
eric@2 100 free (bitmap->bits);
eric@2 101 free (bitmap);
eric@2 102 }
eric@2 103
eric@2 104 boolean get_pixel (Bitmap *bitmap, Point coord)
eric@2 105 {
eric@2 106 u8 *p;
eric@42 107 if ((coord.x < bitmap->rect.min.x) ||
eric@42 108 (coord.x >= bitmap->rect.max.x) ||
eric@42 109 (coord.y < bitmap->rect.min.y) ||
eric@42 110 (coord.y >= bitmap->rect.max.y))
eric@2 111 return (0);
eric@42 112 p = bitmap->bits +
eric@42 113 (coord.y - bitmap->rect.min.y) * bitmap->rowbytes +
eric@42 114 (coord.x - bitmap->rect.min.x) / 8;
eric@2 115 return ((*p & pixel_mask (coord.x & 7)) != 0);
eric@2 116 }
eric@2 117
eric@2 118 void set_pixel (Bitmap *bitmap, Point coord, boolean value)
eric@2 119 {
eric@2 120 u8 *p;
eric@42 121 if ((coord.x < bitmap->rect.min.x) ||
eric@42 122 (coord.x >= bitmap->rect.max.x) ||
eric@42 123 (coord.y < bitmap->rect.min.y) ||
eric@42 124 (coord.y >= bitmap->rect.max.y))
eric@2 125 return;
eric@42 126 p = bitmap->bits +
eric@42 127 (coord.y - bitmap->rect.min.y) * bitmap->rowbytes +
eric@42 128 (coord.x - bitmap->rect.min.x) / 8;
eric@2 129 if (value)
eric@2 130 *p |= pixel_mask (coord.x & 7);
eric@2 131 else
eric@2 132 *p &= (0xff ^ pixel_mask (coord.x & 7));
eric@2 133 }
eric@2 134
eric@2 135
eric@42 136 /* modifies rect1 to be the intersection of rect1 and rect2;
eric@42 137 returns true if intersection is non-null */
eric@42 138 static boolean clip_rect (Rect *rect1, Rect *rect2)
eric@42 139 {
eric@42 140 if (rect1->min.y > rect2->max.y)
eric@42 141 goto empty;
eric@42 142 if (rect1->min.y < rect2->min.y)
eric@42 143 {
eric@42 144 if (rect1->max.y < rect2->max.y)
eric@42 145 goto empty;
eric@42 146 rect1->min.y = rect2->min.y;
eric@42 147 }
eric@42 148 if (rect1->max.y > rect2->max.y)
eric@42 149 rect1->max.y = rect2->max.y;
eric@42 150
eric@42 151 if (rect1->min.x > rect2->max.x)
eric@42 152 goto empty;
eric@42 153 if (rect1->min.x < rect2->min.x)
eric@42 154 {
eric@42 155 if (rect1->max.x < rect2->max.x)
eric@42 156 goto empty;
eric@42 157 rect1->min.x = rect2->min.x;
eric@42 158 }
eric@42 159 if (rect1->max.x > rect2->max.x)
eric@42 160 rect1->max.x = rect2->max.x;
eric@42 161
eric@42 162 empty:
eric@42 163 rect1->min.x = rect1->min.y =
eric@42 164 rect1->max.x = rect1->max.y = 0;
eric@42 165 return (0);
eric@42 166 }
eric@42 167
eric@42 168
eric@2 169 Bitmap *bitblt (Bitmap *src_bitmap,
eric@42 170 Rect *src_rect,
eric@2 171 Bitmap *dest_bitmap,
eric@42 172 Point *dest_min,
eric@2 173 int tfn)
eric@2 174 {
eric@2 175 Point src_point, dest_point;
eric@2 176
eric@2 177 if (! dest_bitmap)
eric@2 178 {
eric@42 179 Rect dest_rect = {{ 0, 0 }, { dest_min->x + rect_width (src_rect),
eric@42 180 dest_min->y + rect_height (src_rect) }};
eric@42 181 dest_bitmap = create_bitmap (& dest_rect);
eric@2 182 if (! dest_bitmap)
eric@2 183 return (NULL);
eric@2 184 }
eric@2 185
eric@42 186 for (src_point.y = src_rect->min.y;
eric@42 187 src_point.y < src_rect->max.y;
eric@2 188 src_point.y++)
eric@2 189 {
eric@42 190 dest_point.y = dest_min->y + src_point.y - src_rect->min.y;
eric@42 191
eric@42 192 for (src_point.x = src_rect->min.x;
eric@42 193 src_point.x < src_rect->max.x;
eric@2 194 src_point.x++)
eric@2 195 {
eric@2 196 boolean a, b, c;
eric@2 197
eric@42 198 dest_point.x = dest_min->x + src_point.x - src_rect->min.x;
eric@3 199
eric@2 200 a = get_pixel (src_bitmap, src_point);
eric@2 201 b = get_pixel (dest_bitmap, dest_point);
eric@2 202 c = (tfn & (1 << (a * 2 + b))) != 0;
eric@2 203
eric@2 204 set_pixel (dest_bitmap, dest_point, c);
eric@2 205 }
eric@2 206 }
eric@2 207 return (dest_bitmap);
eric@2 208 }
eric@42 209
eric@42 210
eric@42 211 /* in-place transformations */
eric@42 212 void flip_h (Bitmap *src)
eric@42 213 {
eric@42 214 u8 *rp; /* row pointer */
eric@42 215 u8 *p1; /* work src ptr */
eric@42 216 u8 *p2; /* work dest ptr */
eric@42 217 u16 d;
eric@42 218 s32 y;
eric@42 219 int shift;
eric@42 220
eric@42 221 realloc_temp_buffer (src->rowbytes + 1);
eric@42 222
eric@42 223 rp = src->bits;
eric@42 224 if ((rect_width (& src->rect) & 7) == 0)
eric@42 225 {
eric@42 226 for (y = src->rect.min.y; y < src->rect.max.y; y++)
eric@42 227 {
eric@42 228 memcpy (temp_buffer, rp, src->rowbytes);
eric@42 229 p1 = temp_buffer + src->rowbytes - 1;
eric@42 230 p2 = rp;
eric@42 231
eric@42 232 while (p1 >= temp_buffer)
eric@42 233 *(p2++) = bit_reverse_byte [*(p1--)];
eric@42 234
eric@42 235 rp += src->rowbytes;
eric@42 236 }
eric@42 237 return;
eric@42 238 }
eric@42 239
eric@42 240 temp_buffer [0] = 0;
eric@42 241 shift = 8 - (rect_width (& src->rect) & 7);
eric@42 242
eric@42 243 for (y = src->rect.min.y; y < src->rect.max.y; y++)
eric@42 244 {
eric@42 245 memcpy (temp_buffer + 1, rp, src->rowbytes);
eric@42 246 p1 = temp_buffer + src->rowbytes;
eric@42 247 p2 = rp;
eric@42 248
eric@42 249 d = *(p1--);
eric@42 250
eric@42 251 while (p1 >= temp_buffer)
eric@42 252 {
eric@42 253 d = (d >> 8) | ((*(p1--)) << 8);
eric@42 254 *(p2++) = bit_reverse_byte [(d >> shift) & 0xff];
eric@42 255 }
eric@42 256
eric@42 257 rp += src->rowbytes;
eric@42 258 }
eric@42 259 }
eric@42 260
eric@42 261 void flip_v (Bitmap *src)
eric@42 262 {
eric@42 263 u8 *p1, *p2;
eric@42 264
eric@42 265 realloc_temp_buffer (src->rowbytes);
eric@42 266
eric@42 267 p1 = src->bits;
eric@42 268 p2 = src->bits + src->rowbytes * (rect_height (& src->rect) - 1);
eric@42 269 while (p1 < p2)
eric@42 270 {
eric@42 271 memcpy (temp_buffer, p1, src->rowbytes);
eric@42 272 memcpy (p1, p2, src->rowbytes);
eric@42 273 memcpy (p2, temp_buffer, src->rowbytes);
eric@42 274 p1 += src->rowbytes;
eric@42 275 p2 -= src->rowbytes;
eric@42 276 }
eric@42 277 }
eric@42 278
eric@42 279 void rot_180 (Bitmap *src) /* combination of flip_h and flip_v */
eric@42 280 {
eric@42 281 flip_h (src);
eric@42 282 flip_v (src);
eric@42 283 }
eric@42 284
eric@42 285 /* "in-place" transformations - will allocate new memory and free old */
eric@42 286 void transpose (Bitmap *src)
eric@42 287 {
eric@42 288 u32 new_rowbytes = CALC_ROWBYTES (rect_height (& src->rect));
eric@42 289 u8 *new_bits;
eric@42 290
eric@42 291 new_bits = calloc (1, new_rowbytes * rect_width (& src->rect));
eric@42 292
eric@42 293 /* $$$ more code needed here */
eric@42 294 }
eric@42 295
eric@42 296 void rot_90 (Bitmap *src) /* transpose + flip_h */
eric@42 297 {
eric@42 298 transpose (src);
eric@42 299 flip_h (src);
eric@42 300 }
eric@42 301
eric@42 302 void rot_270 (Bitmap *src) /* transpose + flip_v */
eric@42 303 {
eric@42 304 transpose (src);
eric@42 305 flip_v (src);
eric@42 306 }