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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4680 | right-hear | 1 | #include "fitz.h" |
| 2 | |||
| 3 | fz_bitmap * |
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| 4 | fz_new_bitmap(int w, int h, int n) |
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| 5 | { |
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| 6 | fz_bitmap *bit; |
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| 7 | |||
| 8 | bit = fz_malloc(sizeof(fz_bitmap)); |
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| 9 | bit->refs = 1; |
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| 10 | bit->w = w; |
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| 11 | bit->h = h; |
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| 12 | bit->n = n; |
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| 13 | /* Span is 32 bit aligned. We may want to make this 64 bit if we |
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| 14 | * use SSE2 etc. */ |
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| 15 | bit->stride = ((n * w + 31) & ~31) >> 3; |
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| 16 | |||
| 17 | bit->samples = fz_calloc(h, bit->stride); |
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| 18 | |||
| 19 | return bit; |
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| 20 | } |
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| 21 | |||
| 22 | fz_bitmap * |
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| 23 | fz_keep_bitmap(fz_bitmap *pix) |
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| 24 | { |
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| 25 | pix->refs++; |
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| 26 | return pix; |
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| 27 | } |
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| 28 | |||
| 29 | void |
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| 30 | fz_drop_bitmap(fz_bitmap *bit) |
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| 31 | { |
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| 32 | if (bit && --bit->refs == 0) |
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| 33 | { |
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| 34 | fz_free(bit->samples); |
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| 35 | fz_free(bit); |
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| 36 | } |
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| 37 | } |
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| 38 | |||
| 39 | void |
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| 40 | fz_clear_bitmap(fz_bitmap *bit) |
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| 41 | { |
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| 42 | memset(bit->samples, 0, bit->stride * bit->h); |
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| 43 | } |
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| 44 | |||
| 45 | /* |
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| 46 | * Write bitmap to PBM file |
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| 47 | */ |
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| 48 | |||
| 49 | fz_error |
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| 50 | fz_write_pbm(fz_bitmap *bitmap, char *filename) |
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| 51 | { |
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| 52 | FILE *fp; |
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| 53 | unsigned char *p; |
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| 54 | int h, bytestride; |
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| 55 | |||
| 56 | fp = fopen(filename, "wb"); |
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| 57 | if (!fp) |
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| 58 | return fz_throw("cannot open file '%s': %s", filename, strerror(errno)); |
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| 59 | |||
| 60 | assert(bitmap->n == 1); |
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| 61 | |||
| 62 | fprintf(fp, "P4\n%d %d\n", bitmap->w, bitmap->h); |
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| 63 | |||
| 64 | p = bitmap->samples; |
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| 65 | |||
| 66 | h = bitmap->h; |
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| 67 | bytestride = (bitmap->w + 7) >> 3; |
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| 68 | while (h--) |
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| 69 | { |
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| 70 | fwrite(p, 1, bytestride, fp); |
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| 71 | p += bitmap->stride; |
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| 72 | } |
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| 73 | |||
| 74 | fclose(fp); |
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| 75 | return fz_okay; |
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| 76 | } |