77 lines
1.1 KiB
C
77 lines
1.1 KiB
C
#include "fitz.h"
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fz_bitmap *
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fz_new_bitmap(int w, int h, int n)
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{
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fz_bitmap *bit;
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bit = fz_malloc(sizeof(fz_bitmap));
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bit->refs = 1;
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bit->w = w;
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bit->h = h;
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bit->n = n;
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/* Span is 32 bit aligned. We may want to make this 64 bit if we
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* use SSE2 etc. */
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bit->stride = ((n * w + 31) & ~31) >> 3;
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bit->samples = fz_calloc(h, bit->stride);
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return bit;
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}
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fz_bitmap *
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fz_keep_bitmap(fz_bitmap *pix)
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{
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pix->refs++;
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return pix;
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}
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void
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fz_drop_bitmap(fz_bitmap *bit)
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{
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if (bit && --bit->refs == 0)
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{
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fz_free(bit->samples);
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fz_free(bit);
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}
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}
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void
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fz_clear_bitmap(fz_bitmap *bit)
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{
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memset(bit->samples, 0, bit->stride * bit->h);
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}
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/*
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* Write bitmap to PBM file
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*/
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fz_error
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fz_write_pbm(fz_bitmap *bitmap, char *filename)
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{
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FILE *fp;
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unsigned char *p;
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int h, bytestride;
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fp = fopen(filename, "wb");
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if (!fp)
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return fz_throw("cannot open file '%s': %s", filename, strerror(errno));
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assert(bitmap->n == 1);
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fprintf(fp, "P4\n%d %d\n", bitmap->w, bitmap->h);
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p = bitmap->samples;
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h = bitmap->h;
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bytestride = (bitmap->w + 7) >> 3;
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while (h--)
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{
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fwrite(p, 1, bytestride, fp);
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p += bitmap->stride;
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}
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fclose(fp);
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return fz_okay;
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}
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