Cosmetics
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23
qoi.h
23
qoi.h
@ -123,22 +123,22 @@ The byte stream is padded with 8 zero-bytes at the end.
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The possible chunks are:
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- QOI_OP_INDEX ----------
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.- QOI_OP_INDEX ----------.
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| Byte[0] |
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| 7 6 5 4 3 2 1 0 |
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|-------+-----------------|
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| 0 0 | index |
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`-------------------------`
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2-bit tag b00
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6-bit index into the color index array: 0..63
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- QOI_OP_DIFF -----------
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.- QOI_OP_DIFF -----------.
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| Byte[0] |
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| 7 6 5 4 3 2 1 0 |
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|-------+-----+-----+-----|
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| 0 1 | dr | dg | db |
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`-------------------------`
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2-bit tag b01
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2-bit red channel difference from the previous pixel between -2..1
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2-bit green channel difference from the previous pixel between -2..1
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@ -151,11 +151,12 @@ Values are stored as unsigned integers with a bias of 2. E.g. -2 is stored as
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0 (b00). 1 is stored as 3 (b11).
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.- QOI_OP_LUMA -------------------------------------.
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| Byte[0] | Byte[1] |
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| 7 6 5 4 3 2 1 0 | 7 6 5 4 3 2 1 0 |
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|-------+-----------------+-------------+-----------|
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| 1 0 | green diff | dr - dg | db - dg |
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`---------------------------------------------------`
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2-bit tag b10
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6-bit green channel difference from the previous pixel -32..31
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4-bit red channel difference minus green channel difference -8..7
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@ -174,12 +175,12 @@ Values are stored as unsigned integers with a bias of 32 for the green channel
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and a bias of 8 for the red and blue channel.
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- QOI_OP_RUN ------------
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.- QOI_OP_RUN ------------.
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| Byte[0] |
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| 7 6 5 4 3 2 1 0 |
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|-------+-----------------|
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| 1 1 | run |
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`-------------------------`
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2-bit tag b11
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6-bit run-length repeating the previous pixel: 1..62
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@ -188,24 +189,24 @@ The run-length is stored with a bias of 1. Note that the run-lengths 63 and 64
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QOI_OP_RGBA tags.
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- QOI_OP_RGB ------------------------------------------
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.- QOI_OP_RGB ------------------------------------------.
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| Byte[0] | Byte[1] | Byte[2] | Byte[3] |
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| 7 6 5 4 3 2 1 0 | 7 .. 0 | 7 .. 0 | 7 .. 0 |
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|-------------------------+---------+---------+---------|
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| 1 1 1 1 1 1 1 0 | red | green | blue |
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`-------------------------------------------------------`
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8-bit tag b11111110
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8-bit red channel value
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8-bit green channel value
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8-bit blue channel value
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- QOI_OP_RGBA ----------------------------------------------------
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.- QOI_OP_RGBA ---------------------------------------------------.
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| Byte[0] | Byte[1] | Byte[2] | Byte[3] | Byte[4] |
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| 7 6 5 4 3 2 1 0 | 7 .. 0 | 7 .. 0 | 7 .. 0 | 7 .. 0 |
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|-------------------------+---------+---------+---------+---------|
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| 1 1 1 1 1 1 1 1 | red | green | blue | alpha |
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`-----------------------------------------------------------------`
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8-bit tag b11111111
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8-bit red channel value
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8-bit green channel value
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