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webp-lossless-bitstream-spec: fix 2 code typos

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- add missing '(' in DIV_ROUND_UP
- in 6.2.2, rename 'pos' variable reference to match definition
  ('position')

spotted by thakis@

Change-Id: Ida3ed281c2c753ebbb0e1eb3c4ed04dadc79ca24
This commit is contained in:
James Zern 2023-04-10 17:18:52 -07:00
parent 50ac4f7c97
commit a6a09b3296
1 changed files with 2 additions and 2 deletions
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4
doc/webp-lossless-bitstream-spec.txt
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@ -241,7 +241,7 @@ two-dimensionally.
int size_bits = ReadBits(3) + 2;
int block_width = (1 << size_bits);
int block_height = (1 << size_bits);
#define DIV_ROUND_UP(num, den) ((num) + (den) - 1) / (den))
#define DIV_ROUND_UP(num, den) (((num) + (den) - 1) / (den))
int block_xsize = DIV_ROUND_UP(image_width, 1 << size_bits);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@ -1008,7 +1008,7 @@ codes to be used as follows:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
int position =
(y >> prefix_bits) * prefix_xsize + (x >> prefix_bits);
int meta_prefix_code = (entropy_image[pos] >> 8) & 0xffff;
int meta_prefix_code = (entropy_image[position] >> 8) & 0xffff;
PrefixCodeGroup prefix_group = prefix_code_groups[meta_prefix_code];
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~