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kolibrios/contrib/media/updf/fitz/res_bitmap.c
right-hearted 4f7ee97ec9 uPDF with buttons
git-svn-id: svn://kolibrios.org@4680 a494cfbc-eb01-0410-851d-a64ba20cac60
2014-03-22 21:00:40 +00:00

77 lines
1.1 KiB
C

#include "fitz.h"
fz_bitmap *
fz_new_bitmap(int w, int h, int n)
{
fz_bitmap *bit;
bit = fz_malloc(sizeof(fz_bitmap));
bit->refs = 1;
bit->w = w;
bit->h = h;
bit->n = n;
/* 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_calloc(h, bit->stride);
return bit;
}
fz_bitmap *
fz_keep_bitmap(fz_bitmap *pix)
{
pix->refs++;
return pix;
}
void
fz_drop_bitmap(fz_bitmap *bit)
{
if (bit && --bit->refs == 0)
{
fz_free(bit->samples);
fz_free(bit);
}
}
void
fz_clear_bitmap(fz_bitmap *bit)
{
memset(bit->samples, 0, bit->stride * bit->h);
}
/*
* Write bitmap to PBM file
*/
fz_error
fz_write_pbm(fz_bitmap *bitmap, char *filename)
{
FILE *fp;
unsigned char *p;
int h, bytestride;
fp = fopen(filename, "wb");
if (!fp)
return fz_throw("cannot open file '%s': %s", filename, strerror(errno));
assert(bitmap->n == 1);
fprintf(fp, "P4\n%d %d\n", bitmap->w, bitmap->h);
p = bitmap->samples;
h = bitmap->h;
bytestride = (bitmap->w + 7) >> 3;
while (h--)
{
fwrite(p, 1, bytestride, fp);
p += bitmap->stride;
}
fclose(fp);
return fz_okay;
}