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#include "fitz.h"
fz_bitmap *
fz_new_bitmap(fz_context *ctx, int w, int h, int n)
{
fz_bitmap *bit;
bit = fz_malloc(ctx, 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_malloc_array(ctx, h, bit->stride);
return bit;
}
fz_bitmap *
fz_keep_bitmap(fz_bitmap *pix)
{
pix->refs++;
return pix;
}
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_bitmap *bit)
{
memset(bit->samples, 0, bit->stride * bit->h);
}
/*
* Write bitmap to PBM file
*/
void
fz_write_pbm(fz_context *ctx, fz_bitmap *bitmap, char *filename)
{
FILE *fp;
unsigned char *p;
int h, bytestride;
fp = fopen(filename, "wb");
if (!fp)
fz_throw(ctx, "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);
}
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