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Adds wraparound specification

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Felix "xq" Queißner 2021-11-28 01:17:24 +01:00
parent 7053672d3a
commit ef9ce10bc1
1 changed files with 13 additions and 4 deletions
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qoi.h
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@ -148,6 +148,9 @@ The possible chunks are:
g1...g0 forming the green channel difference between -2..1 g1...g0 forming the green channel difference between -2..1
b1...b0 forming the blue channel difference between -2..1 b1...b0 forming the blue channel difference between -2..1
The difference to the current channel values are using a wraparound operation, so "1 - 2" will result in 255, while
"255 + 1" will result in 0.
| QOI_DIFF_16 | | QOI_DIFF_16 |
| Byte + 0 | Byte + 1 | | Byte + 0 | Byte + 1 |
@ -159,6 +162,9 @@ The possible chunks are:
g3...g0 forming the green channel difference between -8..7 g3...g0 forming the green channel difference between -8..7
b3...b0 forming the blue channel difference between -8..7 b3...b0 forming the blue channel difference between -8..7
The difference to the current channel values are using a wraparound operation, so "10 - 13" will result in 253, while
"250 + 7" will result in 1.
| QOI_DIFF_24 | | QOI_DIFF_24 |
| Byte + 0 | Byte + 1 | Byte + 1 | | Byte + 0 | Byte + 1 | Byte + 1 |
@ -166,10 +172,13 @@ The possible chunks are:
|-------------------------|-------------------------|-------------------------| |-------------------------|-------------------------|-------------------------|
| 1 1 1 0 r4 r3 r2 r1 | r0 g4 g3 g2 g1 g0 b4 b3 | b2 b1 b0 a4 a3 a2 a1 a0 | | 1 1 1 0 r4 r3 r2 r1 | r0 g4 g3 g2 g1 g0 b4 b3 | b2 b1 b0 a4 a3 a2 a1 a0 |
r4...r0 forming the red channel difference between -16..15 r4...r0 forming the red channel difference between -16..15
g4...g0 forming the green channel difference between -16..15 g4...g0 forming the green channel difference between -16..15
b4...b0 forming the blue channel difference between -16..15 b4...b0 forming the blue channel difference between -16..15
a4...a0 forming the alpha channel difference between -16..15 a4...a0 forming the alpha channel difference between -16..15
The difference to the current channel values are using a wraparound operation, so "10 - 13" will result in 253, while
"250 + 7" will result in 1.
| QOI_COLOR | | QOI_COLOR |