| Flutter Impeller |

Public Attributes | List of all members
ImpellerColorMatrix Struct Reference

`#include <impeller.h>`

## Public Attributes
float | m [20]

## Detailed Description

A 4x5 matrix using row-major storage used for transforming color values.

To transform color values, a 5x5 matrix is constructed with the 5th row being identity. Then the following transformation is performed:

| R' | | m[0] m[1] m[2] m[3] m[4] | | R |
| G' | | m[5] m[6] m[7] m[8] m[9] | | G |
| B' | = | m[10] m[11] m[12] m[13] m[14] | * | B |
| A' | | m[15] m[16] m[17] m[18] m[19] | | A |
| 1 | | 0 0 0 0 1 | | 1 |

The translation column (m[4], m[9], m[14], m[19]) must be specified in non-normalized 8-bit unsigned integer space (0 to 255). Values outside this range will produce undefined results.

The identity transformation is thus:

1, 0, 0, 0, 0,
0, 1, 0, 0, 0,
0, 0, 1, 0, 0,
0, 0, 0, 1, 0,

Some examples:

To invert all colors:

-1, 0, 0, 0, 255,
0, -1, 0, 0, 255,
0, 0, -1, 0, 255,
0, 0, 0, 1, 0,

To apply a sepia filter:

0.393, 0.769, 0.189, 0, 0,
0.349, 0.686, 0.168, 0, 0,
0.272, 0.534, 0.131, 0, 0,
0, 0, 0, 1, 0,

To apply a grayscale conversion filter:

0.2126, 0.7152, 0.0722, 0, 0,
0.2126, 0.7152, 0.0722, 0, 0,
0.2126, 0.7152, 0.0722, 0, 0,
0, 0, 0, 1, 0,

See also
  ImpellerColorFilter

Definition at line 534 of file impeller.h.

## Member Data Documentation

## ◆ m

float ImpellerColorMatrix::m[20]

Definition at line 535 of file impeller.h.

Referenced by impeller::interop::ImpellerColorFilterCreateColorMatrixNew().

The documentation for this struct was generated from the following file:

- impeller/toolkit/interop/impeller.h

ImpellerColorMatrix::m
float m[20]
Definition: impeller.h:535