src/swf_cxformwithalpha.c

   1 #include <stdio.h>
   2 #include "bitstream.h"
   3 #include "swf_cxformwithalpha.h"
   4
   5 int
   6 swf_cxformwithalpha_parse(bitstream_t *bs, swf_cxformwithalpha_t *cx) {
   7     int ret, nbits;
   8     bitstream_align(bs);
   9     cx->has_add_terms  = bitstream_getbit(bs);
  10     cx->has_mult_terms = bitstream_getbit(bs);
  11     nbits = bitstream_getbits(bs, 4);
  12     cx->nbits = nbits;
  13     if (cx->has_mult_terms) {
  14         cx->red_mult_term   = bitstream_getbits(bs, nbits);
  15         cx->green_mult_term = bitstream_getbits(bs, nbits);
  16         cx->blue_mult_term  = bitstream_getbits(bs, nbits);
  17         ret                 = bitstream_getbits(bs, nbits);
  18         if (ret == -1) {
  19             return 1;
  20         }
  21         cx->alpha_mult_term  = ret;
  22     }
  23     if (cx->has_add_terms) {
  24         cx->red_add_term   = bitstream_getbits(bs, nbits);
  25         cx->green_add_term = bitstream_getbits(bs, nbits);
  26         cx->blue_add_term  = bitstream_getbits(bs, nbits);
  27         ret                = bitstream_getbits(bs, nbits);
  28         if (ret == -1) {
  29             return 1;
  30         }
  31         cx->alpha_add_term  = ret;
  32     }
  33     return 0;
  34 }
  35
  36 int
  37 swf_cxformwithalpha_build(bitstream_t *bs, swf_cxformwithalpha_t *cx) {
  38     int nbits;
  39     bitstream_align(bs);
  40     bitstream_putbit(bs, cx->has_add_terms);
  41     bitstream_putbit(bs, cx->has_mult_terms);
  42     nbits = cx->nbits;
  43     bitstream_putbits(bs, nbits, 4);
  44     if (cx->has_mult_terms) {
  45         bitstream_putbits(bs, cx->red_mult_term,   nbits);
  46         bitstream_putbits(bs, cx->green_mult_term, nbits);
  47         bitstream_putbits(bs, cx->blue_mult_term,  nbits);
  48         bitstream_putbits(bs, cx->alpha_mult_term, nbits);
  49     }
  50     if (cx->has_add_terms) {
  51         bitstream_putbits(bs, cx->red_add_term,   nbits);
  52         bitstream_putbits(bs, cx->green_add_term, nbits);
  53         bitstream_putbits(bs, cx->blue_add_term,  nbits);
  54         bitstream_putbits(bs, cx->alpha_add_term, nbits);
  55     }
  56     return 0;
  57 }
  58
  59 int
  60 swf_cxformwithalpha_print(swf_cxformwithalpha_t *cx, int indent_depth) {
  61     print_indent(indent_depth);
  62     printf("CXFORMWITHALPHA:");
  63     if (cx->has_mult_terms) {
  64         printf("  MultTerm:%02x%02x%02x(%02x)",
  65                cx->red_mult_term, cx->green_mult_term, cx->blue_mult_term,
  66                cx->alpha_mult_term);
  67     }
  68     if (cx->has_add_terms) {
  69         printf("  AddTerm:%02x%02x%02x(%02x)",
  70                cx->red_add_term, cx->green_add_term, cx->blue_add_term,
  71                cx->alpha_add_term);
  72     }
  73     if ((cx->has_add_terms == 0) && (cx->has_mult_terms == 0)) {
  74         printf("  (no add_terms or mult_terms)");
  75     }
  76     printf("\n");
  77     return 0;
  78 }