inicial

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diff --git a/backend/dvi/mdvi-lib/bitmap.h b/backend/dvi/mdvi-lib/bitmap.h
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+/*
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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, int));
+extern BITMAP *bitmap_convert_msb8 __PROTO((Uchar *, int, int, int));
+
+#include <stdio.h>
+extern void	bitmap_print __PROTO((FILE *, BITMAP *));
+
+#endif /* _BITMAP_H */