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Fixes for grey scale reduction (#171)

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This commit is contained in:
Felix Hanau 2019-06-18 18:04:26 +01:00 committed by Josh Holmer
parent 9c6190c1ff
commit cc290c0bdb
1 changed files with 18 additions and 14 deletions
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32
src/reduction/bit_depth.rs
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@ -4,24 +4,28 @@ use crate::png::PngImage;
use bit_vec::BitVec;
const ONE_BIT_PERMUTATIONS: [u8; 2] = [0b0000_0000, 0b1111_1111];
const TWO_BIT_PERMUTATIONS: [u8; 5] = [
const TWO_BIT_PERMUTATIONS: [u8; 4] = [
0b0000_0000,
0b0000_1111,
0b0011_1100,
0b1111_0000,
0b0101_0101,
0b1010_1010,
0b1111_1111,
];
const FOUR_BIT_PERMUTATIONS: [u8; 11] = [
const FOUR_BIT_PERMUTATIONS: [u8; 16] = [
0b0000_0000,
0b0000_0011,
0b0000_1100,
0b0011_0000,
0b1100_0000,
0b0000_1111,
0b0011_1100,
0b1111_0000,
0b0011_1111,
0b1111_1100,
0b0001_0001,
0b0010_0010,
0b0011_0011,
0b0100_0100,
0b0101_0101,
0b0110_0110,
0b0111_0111,
0b1000_1000,
0b1001_1001,
0b1010_1010,
0b1011_1011,
0b1100_1100,
0b1101_1101,
0b1110_1110,
0b1111_1111,
];