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Plot style: Add function to engorge a colour channel. 

This can be used to exaggerate the red, green, or blue component.
This commit is contained in:
Michael Drake 2020-02-23 16:57:23 +00:00
parent 6783deba4e
commit 475d397b8c
1 changed files with 33 additions and 0 deletions
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33
include/netsurf/plot_style.h
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@ -188,6 +188,39 @@ typedef struct plot_font_style {
#define blue_from_colour(c) \
((c >> 16) & 0xff)
/** Colour components */
enum plot_colour_component {
PLOT_COLOUR_COMPONENT_RED,
PLOT_COLOUR_COMPONENT_GREEN,
PLOT_COLOUR_COMPONENT_BLUE,
PLOT_COLOUR_COMPONENT_ALPHA,
};
/**
* Engorge a particular colour channel.
*
* \param[in] col The colour to engorge a component of.
* \param[in] dark Whether col is a dark colour.
* \param[in] comp Colour component to engorge.
*/
static inline colour colour_engorge_component(
colour col,
bool dark,
enum plot_colour_component comp)
{
static const colour mask[PLOT_COLOUR_COMPONENT_ALPHA] = {
[PLOT_COLOUR_COMPONENT_RED] = 0x0000ff,
[PLOT_COLOUR_COMPONENT_GREEN] = 0x00ff00,
[PLOT_COLOUR_COMPONENT_BLUE] = 0xff0000,
};
colour d = dark ? darken_colour(col) : double_darken_colour(col);
colour l = dark ? double_lighten_colour(col) : lighten_colour(col);
assert(comp < PLOT_COLOUR_COMPONENT_ALPHA);
return (mask[comp] & l) | (~mask[comp] & d);
}
/* global fill styles */
extern plot_style_t *plot_style_fill_white;