Gradient

Gradient class.

Nothing here is a public API, it's only internal to dplug:canvas.

A gradient owns:

- a list of colours and positions (known as stops) along a single dimension from 0 to 1. The colors are a 32-bit RGBA quadruplet.

- a look-up table of colors (LUT) indexed by blitters.

It has a lookup table for the rasterizer, built lazily (was originally always 256 samples).

FUTURE: size of look-up is dynamically choosen

class Gradient {

struct ColorStop;

void addStop(float pos, uint color);

void reset();

size_t length();

int lutLength();

uint[] getLookup();

bool hasChanged();

}

Members

Functions

addStop void addStop(float pos, uint color): Add a color stop.
getLookup uint[] getLookup()
hasChanged bool hasChanged()
length size_t length()
lutLength int lutLength(): Get look-up length. This is invalidated in cases the color stops are redone with .reset or .addStop.
reset void reset(): Reset things, have zero color stop. Invalidate look-up.

Structs

ColorStop struct ColorStop: Undocumented in source.

Meta

Source

See Implementation

dplug canvas gradient classes

Gradient