1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
#include "mupdf/fitz.h"
fz_bitmap *
fz_new_bitmap(fz_context *ctx, int w, int h, int n, int xres, int yres)
{
fz_bitmap *bit;
bit = fz_malloc_struct(ctx, fz_bitmap);
bit->refs = 1;
bit->w = w;
bit->h = h;
bit->n = n;
bit->xres = xres;
bit->yres = yres;
/* Span is 32 bit aligned. We may want to make this 64 bit if we
* use SSE2 etc. */
bit->stride = ((n * w + 31) & ~31) >> 3;
bit->samples = fz_malloc_array(ctx, h, bit->stride);
return bit;
}
fz_bitmap *
fz_keep_bitmap(fz_context *ctx, fz_bitmap *bit)
{
if (bit)
bit->refs++;
return bit;
}
void
fz_drop_bitmap(fz_context *ctx, fz_bitmap *bit)
{
if (bit && --bit->refs == 0)
{
fz_free(ctx, bit->samples);
fz_free(ctx, bit);
}
}
void
fz_clear_bitmap(fz_context *ctx, fz_bitmap *bit)
{
memset(bit->samples, 0, bit->stride * bit->h);
}
void
fz_write_bitmap_as_pbm(fz_context *ctx, fz_output *out, fz_bitmap *bitmap)
{
unsigned char *p;
int h, bytestride;
if (bitmap->n != 1)
fz_throw(ctx, FZ_ERROR_GENERIC, "too many color components in bitmap");
fz_printf(ctx, out, "P4\n%d %d\n", bitmap->w, bitmap->h);
p = bitmap->samples;
h = bitmap->h;
bytestride = (bitmap->w + 7) >> 3;
while (h--)
{
fz_write(ctx, out, p, bytestride);
p += bitmap->stride;
}
}
void
fz_save_bitmap_as_pbm(fz_context *ctx, fz_bitmap *bitmap, char *filename)
{
fz_output *out = fz_new_output_with_path(ctx, filename, 0);
fz_try(ctx)
fz_write_bitmap_as_pbm(ctx, out, bitmap);
fz_always(ctx)
fz_drop_output(ctx, out);
fz_catch(ctx)
fz_rethrow(ctx);
}
void fz_bitmap_details(fz_bitmap *bit, int *w, int *h, int *n, int *stride)
{
if (!bit)
{
if (w)
*w = 0;
if (h)
*h = 0;
if (n)
*n = 0;
if (stride)
*stride = 0;
return;
}
if (w)
*w = bit->w;
if (h)
*h = bit->h;
if (n)
*n = bit->n;
if (stride)
*stride = bit->stride;
}
|
