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Diffstat (limited to 'backend/dvi/mdvi-lib/bitmap.h')
| -rw-r--r-- | backend/dvi/mdvi-lib/bitmap.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/backend/dvi/mdvi-lib/bitmap.h b/backend/dvi/mdvi-lib/bitmap.h new file mode 100644 index 0000000..4d5f23a --- /dev/null +++ b/backend/dvi/mdvi-lib/bitmap.h @@ -0,0 +1,145 @@ +/* + * Copyright (C) 2000, Matias Atria + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#ifndef _BITMAP_H +#define _BITMAP_H 1 + +#include "sysdeps.h" + +/* Structures and functions to manipulate bitmaps */ + +/* bitmap unit (as in X's docs) */ +typedef Uint32 BmUnit; + +/* size (in bytes) of a bitmap atom */ +#define BITMAP_BYTES 4 + +/* size (in bits) of a bitmap atom */ +#define BITMAP_BITS (BITMAP_BYTES << 3) + +typedef struct { + int width; + int height; + int stride; + BmUnit *data; +} BITMAP; + +#define BM_BYTES_PER_LINE(b) \ + (ROUND((b)->width, BITMAP_BITS) * BITMAP_BYTES) +#define BM_WIDTH(b) (((BITMAP *)(b))->width) +#define BM_HEIGHT(b) (((BITMAP *)(b))->height) + +#define BMBIT(n) ((BmUnit)1 << (n)) + +/* Macros to manipulate individual pixels in a bitmap + * (they are slow, don't use them) + */ + +#define bm_offset(b,o) (BmUnit *)((Uchar *)(b) + (o)) + +#define __bm_unit_ptr(b,x,y) \ + bm_offset((b)->data, (y) * (b)->stride + \ + ((x) / BITMAP_BITS) * BITMAP_BYTES) + +#define __bm_unit(b,x,y) __bm_unit_ptr((b), (x), (y))[0] + +#define BM_GETPIXEL(b,x,y) __bm_unit((b), (x), (y)) +#define BM_SETPIXEL(b,x,y) (__bm_unit((b), (x), (y)) |= FIRSTMASKAT(x)) +#define BM_CLRPIXEL(b,x,y) (__bm_unit((b), (x), (y)) &= ~FIRSTMASKAT(x)) + +/* + * These macros are used to access pixels in a bitmap. They are supposed + * to be used like this: + */ +#if 0 + BmUnit *row, mask; + + mask = FIRSTMASK; + + /* position `unit' at coordinates (column_number, row_number) */ + unit = (BmUnit *)((char *)bitmap->data + row_number * bitmap->stride + + (column_number / BITMAP_BITS); + /* loop over all pixels IN THE SAME ROW */ + for(i = 0; i < number_of_pixels; i++) { + /* to test if a pixel is set */ + if(*unit & mask) { + /* yes, it is, do something with it */ + } + /* to set/clear a pixel */ + if(painting) + *unit |= mask; /* now you see it */ + else + *unit &= ~mask; /* now you don't */ + /* move to next pixel */ + if(mask == LASTMASK) { + unit++; + UPDATEMASK(mask); + } + } +/* end of sample code */ +#endif + +/* bitmaps are stored in native byte order */ +#ifdef WORD_BIG_ENDIAN +#define FIRSTSHIFT (BITMAP_BITS - 1) +#define LASTSHIFT 0 +#define NEXTMASK(m) ((m) >>= 1) +#define PREVMASK(m) ((m) <<= 1) +#define FIRSTSHIFTAT(c) (BITMAP_BITS - ((c) % BITMAP_BITS) - 1) +#else +#define FIRSTSHIFT 0 +#define LASTSHIFT (BITMAP_BITS - 1) +#define NEXTMASK(m) ((m) <<= 1) +#define PREVMASK(m) ((m) >>= 1) +#define FIRSTSHIFTAT(c) ((c) % BITMAP_BITS) +#endif + +#define FIRSTMASK BMBIT(FIRSTSHIFT) +#define FIRSTMASKAT(c) BMBIT(FIRSTSHIFTAT(c)) +#define LASTMASK BMBIT(LASTSHIFT) + +extern BITMAP *bitmap_alloc __PROTO((int, int)); +extern BITMAP *bitmap_alloc_raw __PROTO((int, int)); +extern void bitmap_destroy __PROTO((BITMAP *)); + +/* + * set_row(bm, row, col, count, state): + * sets `count' pixels to state `onoff', starting from pixel + * at position (col, row). All pixels must lie in the same + * row. + */ +extern void bitmap_set_col __PROTO((BITMAP *, int, int, int, int)); +extern void bitmap_set_row __PROTO((BITMAP *, int, int, int, int)); + +extern void bitmap_paint_bits __PROTO((BmUnit *, int, int)); +extern void bitmap_clear_bits __PROTO((BmUnit *, int, int)); + +extern BITMAP *bitmap_copy __PROTO((BITMAP *)); +extern void bitmap_flip_horizontally __PROTO((BITMAP *)); +extern void bitmap_flip_vertically __PROTO((BITMAP *)); +extern void bitmap_flip_diagonally __PROTO((BITMAP *)); +extern void bitmap_rotate_clockwise __PROTO((BITMAP *)); +extern void bitmap_rotate_counter_clockwise __PROTO((BITMAP *)); +extern void bitmap_flip_rotate_clockwise __PROTO((BITMAP *)); +extern void bitmap_flip_rotate_counter_clockwise __PROTO((BITMAP *)); +extern BITMAP *bitmap_convert_lsb8 __PROTO((Uchar *, int, int)); +extern BITMAP *bitmap_convert_msb8 __PROTO((Uchar *, int, int)); + +#include <stdio.h> +extern void bitmap_print __PROTO((FILE *, BITMAP *)); + +#endif /* _BITMAP_H */ |