summaryrefslogtreecommitdiff
path: root/Build/source/texk/dvisvgm/dvisvgm-1.2.2/potracelib/bitmap.h
diff options
context:
space:
mode:
Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.2.2/potracelib/bitmap.h')
-rw-r--r--Build/source/texk/dvisvgm/dvisvgm-1.2.2/potracelib/bitmap.h97
1 files changed, 97 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.2.2/potracelib/bitmap.h b/Build/source/texk/dvisvgm/dvisvgm-1.2.2/potracelib/bitmap.h
new file mode 100644
index 00000000000..1ce13d61e2d
--- /dev/null
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.2.2/potracelib/bitmap.h
@@ -0,0 +1,97 @@
+/* Copyright (C) 2001-2013 Peter Selinger.
+ This file is part of Potrace. It is free software and it is covered
+ by the GNU General Public License. See the file COPYING for details. */
+
+#ifndef BITMAP_H
+#define BITMAP_H
+
+#include <string.h>
+#include <stdlib.h>
+
+/* The bitmap type is defined in potracelib.h */
+#include "potracelib.h"
+
+/* The present file defines some convenient macros and static inline
+ functions for accessing bitmaps. Since they only produce inline
+ code, they can be conveniently shared by the library and frontends,
+ if desired */
+
+/* ---------------------------------------------------------------------- */
+/* some measurements */
+
+#define BM_WORDSIZE ((int)sizeof(potrace_word))
+#define BM_WORDBITS (8*BM_WORDSIZE)
+#define BM_HIBIT (((potrace_word)1)<<(BM_WORDBITS-1))
+#define BM_ALLBITS (~(potrace_word)0)
+
+/* macros for accessing pixel at index (x,y). U* macros omit the
+ bounds check. */
+
+#define bm_scanline(bm, y) ((bm)->map + (y)*(bm)->dy)
+#define bm_index(bm, x, y) (&bm_scanline(bm, y)[(x)/BM_WORDBITS])
+#define bm_mask(x) (BM_HIBIT >> ((x) & (BM_WORDBITS-1)))
+#define bm_range(x, a) ((int)(x) >= 0 && (int)(x) < (a))
+#define bm_safe(bm, x, y) (bm_range(x, (bm)->w) && bm_range(y, (bm)->h))
+#define BM_UGET(bm, x, y) ((*bm_index(bm, x, y) & bm_mask(x)) != 0)
+#define BM_USET(bm, x, y) (*bm_index(bm, x, y) |= bm_mask(x))
+#define BM_UCLR(bm, x, y) (*bm_index(bm, x, y) &= ~bm_mask(x))
+#define BM_UINV(bm, x, y) (*bm_index(bm, x, y) ^= bm_mask(x))
+#define BM_UPUT(bm, x, y, b) ((b) ? BM_USET(bm, x, y) : BM_UCLR(bm, x, y))
+#define BM_GET(bm, x, y) (bm_safe(bm, x, y) ? BM_UGET(bm, x, y) : 0)
+#define BM_SET(bm, x, y) (bm_safe(bm, x, y) ? BM_USET(bm, x, y) : 0)
+#define BM_CLR(bm, x, y) (bm_safe(bm, x, y) ? BM_UCLR(bm, x, y) : 0)
+#define BM_INV(bm, x, y) (bm_safe(bm, x, y) ? BM_UINV(bm, x, y) : 0)
+#define BM_PUT(bm, x, y, b) (bm_safe(bm, x, y) ? BM_UPUT(bm, x, y, b) : 0)
+
+/* free the given bitmap. Leaves errno untouched. */
+static inline void bm_free(potrace_bitmap_t *bm) {
+ if (bm) {
+ free(bm->map);
+ }
+ free(bm);
+}
+
+/* return new un-initialized bitmap. NULL with errno on error */
+static inline potrace_bitmap_t *bm_new(int w, int h) {
+ potrace_bitmap_t *bm;
+ int dy = (w + BM_WORDBITS - 1) / BM_WORDBITS;
+
+ bm = (potrace_bitmap_t *) malloc(sizeof(potrace_bitmap_t));
+ if (!bm) {
+ return NULL;
+ }
+ bm->w = w;
+ bm->h = h;
+ bm->dy = dy;
+ bm->map = (potrace_word *) malloc(dy * h * BM_WORDSIZE);
+ if (!bm->map) {
+ free(bm);
+ return NULL;
+ }
+ return bm;
+}
+
+/* clear the given bitmap. Set all bits to c. */
+static inline void bm_clear(potrace_bitmap_t *bm, int c) {
+ memset(bm->map, c ? -1 : 0, bm->dy * bm->h * BM_WORDSIZE);
+}
+
+/* duplicate the given bitmap. Return NULL on error with errno set. */
+static inline potrace_bitmap_t *bm_dup(const potrace_bitmap_t *bm) {
+ potrace_bitmap_t *bm1 = bm_new(bm->w, bm->h);
+ if (!bm1) {
+ return NULL;
+ }
+ memcpy(bm1->map, bm->map, bm->dy * bm->h * BM_WORDSIZE);
+ return bm1;
+}
+
+/* invert the given bitmap. */
+static inline void bm_invert(potrace_bitmap_t *bm) {
+ int i;
+ for (i = 0; i < bm->dy * bm->h; i++) {
+ bm->map[i] ^= BM_ALLBITS;
+ }
+}
+
+#endif /* BITMAP_H */