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webp-lossless-bitstream-spec: fix code blocks

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+ change "> 19" to "greater than 19" as it's referred to in prose

Bug: webp:611
Change-Id: I644d7d39f9c4a19050ff0256114873057aee95ef
This commit is contained in:
James Zern 2023-07-25 22:06:41 -07:00
parent cd436142f6
commit 67a7cc2b07
1 changed files with 8 additions and 8 deletions
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16
doc/webp-lossless-bitstream-spec.txt
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@ -336,7 +336,7 @@ for each ARGB component as follows:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Clamp the input value between 0 and 255. // Clamp the input value between 0 and 255.
int Clamp(int a) { int Clamp(int a) {
return (a < 0) ? 0 : (a > 255) ? 255 : a; return (a < 0) ? 0 : (a > 255) ? 255 : a;
} }
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@ -594,9 +594,9 @@ After reading this transform, `image_width` is subsampled by `width_bits`. This
affects the size of subsequent transforms. The new size can be calculated using affects the size of subsequent transforms. The new size can be calculated using
`DIV_ROUND_UP`, as defined [earlier](#predictor-transform). `DIV_ROUND_UP`, as defined [earlier](#predictor-transform).
``` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
image_width = DIV_ROUND_UP(image_width, 1 << width_bits); image_width = DIV_ROUND_UP(image_width, 1 << width_bits);
``` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5 Image Data 5 Image Data
------------ ------------
@ -788,14 +788,14 @@ int color_cache_code_bits = ReadBits(4);
int color_cache_size = 1 << color_cache_code_bits; int color_cache_size = 1 << color_cache_code_bits;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
`color_cache_code_bits` defines the size of the color_cache (1 << `color_cache_code_bits` defines the size of the color_cache (`1 <<
`color_cache_code_bits`). The range of allowed values for color_cache_code_bits`). The range of allowed values for
`color_cache_code_bits` is \[1..11\]. Compliant decoders must indicate a `color_cache_code_bits` is \[1..11\]. Compliant decoders must indicate a
corrupted bitstream for other values. corrupted bitstream for other values.
A color cache is an array of size `color_cache_size`. Each entry stores one ARGB A color cache is an array of size `color_cache_size`. Each entry stores one ARGB
color. Colors are looked up by indexing them by (0x1e35a7bd * `color`) >> (32 - color. Colors are looked up by indexing them by `(0x1e35a7bd * color) >> (32 -
`color_cache_code_bits`). Only one lookup is done in a color cache; there is no color_cache_code_bits)`. Only one lookup is done in a color cache; there is no
conflict resolution. conflict resolution.
In the beginning of decoding or encoding of an image, all entries in all color In the beginning of decoding or encoding of an image, all entries in all color
@ -904,7 +904,7 @@ First, `num_code_lengths` specifies the number of code lengths.
int num_code_lengths = 4 + ReadBits(4); int num_code_lengths = 4 + ReadBits(4);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If `num_code_lengths` is > 19, the bitstream is invalid. If `num_code_lengths` is greater than 19, the bitstream is invalid.
The code lengths are themselves encoded using prefix codes; lower-level code The code lengths are themselves encoded using prefix codes; lower-level code
lengths, `code_length_code_lengths`, first have to be read. The rest of those lengths, `code_length_code_lengths`, first have to be read. The rest of those