RasterPaint.h File Reference

CPU brush dabs into a Raster - the pixel half of an editor Brush tool. More...

#include <glm/glm.hpp>
#include "Raster.h"

Include dependency graph for RasterPaint.h:

Functions
int	rig::image::paintDab (pixel::Raster &raster, const glm::vec2 &center, float radiusPx, const glm::vec4 &rgba)
	Stamp one soft round dab, alpha-blended over the pixels.
int	rig::image::paintStroke (pixel::Raster &raster, const glm::vec2 &from, const glm::vec2 &to, float radiusPx, const glm::vec4 &rgba)
	Stamp dabs along a segment so a drag reads as one stroke.

Detailed Description

CPU brush dabs into a Raster - the pixel half of an editor Brush tool.

Pure pixel writes, no GL and no UI. The caller owns the raster, re-uploads the texture, and persists the file.

Function Documentation

paintDab()

int rig::image::paintDab	(	pixel::Raster &	raster,
		const glm::vec2 &	center,
		float	radiusPx,
		const glm::vec4 &	rgba )

Stamp one soft round dab, alpha-blended over the pixels.

Parameters

center	Dab centre in raster pixels.
radiusPx	Dab radius in pixels (>= 0.5 to mark anything).
rgba	Brush colour; a scales dab opacity.

Returns

Pixels touched. 0 when the dab misses the raster.

paintStroke()

int rig::image::paintStroke	(	pixel::Raster &	raster,
		const glm::vec2 &	from,
		const glm::vec2 &	to,
		float	radiusPx,
		const glm::vec4 &	rgba )

Stamp dabs along a segment so a drag reads as one stroke.

Dab spacing is a quarter radius - close enough that round caps fuse into a band. Endpoints included.

Returns

Pixels touched over all dabs.