179 lines
5.8 KiB
C
179 lines
5.8 KiB
C
#pragma once
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "../types.h"
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typedef uint32_t COLOR;
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typedef uint8_t COLOR_COMPONENT;
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static const COLOR_COMPONENT TRANSPARENT = 0;
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static const COLOR_COMPONENT OPAQUE = 255;
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static inline COLOR_COMPONENT color_get_a(COLOR color) {
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return (color & 0xff000000) >> 24;
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}
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static inline COLOR_COMPONENT color_get_r(COLOR color) {
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return (color & 0x00ff0000) >> 16;
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}
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static inline COLOR_COMPONENT color_get_g(COLOR color) {
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return (color & 0x0000ff00) >> 8;
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}
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static inline COLOR_COMPONENT color_get_b(COLOR color) {
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return (color & 0x000000ff);
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}
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static inline void color_extract(COLOR color, COLOR_COMPONENT *r, COLOR_COMPONENT *g, COLOR_COMPONENT *b, COLOR_COMPONENT *a) {
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if (a)
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*a = color_get_a(color);
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if (r)
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*r = color_get_r(color);
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if (g)
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*g = color_get_g(color);
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if (b)
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*b = color_get_b(color);
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}
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static inline COLOR color_create_rgba(COLOR_COMPONENT r, COLOR_COMPONENT g, COLOR_COMPONENT b, COLOR_COMPONENT a) {
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return (a << 24) | (r << 16) | (g << 8) | b;
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}
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static inline COLOR color_create_rgb(COLOR_COMPONENT r, COLOR_COMPONENT g, COLOR_COMPONENT b) {
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return color_create_rgba(r, g, b, OPAQUE);
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}
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/* floating-point color components */
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typedef float COLORF_COMPONENT;
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static const COLORF_COMPONENT TRANSPARENT_F = 0.0f;
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static const COLORF_COMPONENT OPAQUE_F = 1.0f;
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static inline COLORF_COMPONENT colorf_get_a(COLOR color) {
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return (float)((color & 0xff000000) >> 24) / 255;
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}
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static inline COLORF_COMPONENT colorf_get_r(COLOR color) {
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return (float)((color & 0x00ff0000) >> 16) / 255;
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}
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static inline COLORF_COMPONENT colorf_get_g(COLOR color) {
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return (float)((color & 0x0000ff00) >> 8) / 255;
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}
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static inline COLORF_COMPONENT colorf_get_b(COLOR color) {
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return (float)(color & 0x000000ff) / 255;
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}
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static inline void colorf_extract(COLOR color, COLORF_COMPONENT *r, COLORF_COMPONENT *g, COLORF_COMPONENT *b, COLORF_COMPONENT *a) {
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if (a)
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*a = colorf_get_a(color);
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if (r)
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*r = colorf_get_r(color);
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if (g)
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*g = colorf_get_g(color);
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if (b)
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*b = colorf_get_b(color);
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}
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static inline COLOR colorf_create_rgba(COLORF_COMPONENT r, COLORF_COMPONENT g, COLORF_COMPONENT b, COLORF_COMPONENT a) {
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return ((COLOR_COMPONENT)(a * 255) << 24) |
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((COLOR_COMPONENT)(r * 255) << 16) |
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((COLOR_COMPONENT)(g * 255) << 8) |
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(COLOR_COMPONENT)(b * 255);
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}
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static inline COLOR colorf_create_rgb(COLORF_COMPONENT r, COLORF_COMPONENT g, COLORF_COMPONENT b, COLORF_COMPONENT a) {
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return colorf_create_rgba(r, g, b, OPAQUE_F);
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}
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static inline COLOR color_blend(COLOR source, COLOR destination) {
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int sR = color_get_r(source);
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int sG = color_get_g(source);
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int sB = color_get_b(source);
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int sA = color_get_a(source);
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int dR = color_get_r(destination);
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int dG = color_get_g(destination);
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int dB = color_get_b(destination);
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int dA = color_get_a(destination);
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// this is equivalent to "glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)"
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return color_create_rgba(
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(COLOR_COMPONENT)(((sR * sA) + (dR * (255 - sA))) / 255),
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(COLOR_COMPONENT)(((sG * sA) + (dG * (255 - sA))) / 255),
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(COLOR_COMPONENT)(((sB * sA) + (dB * (255 - sA))) / 255),
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(COLOR_COMPONENT)(((sA * sA) + (dA * (255 - sA))) / 255)
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);
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}
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static inline COLOR color_tint(COLOR color, COLOR tint) {
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int cR = color_get_r(color);
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int cG = color_get_g(color);
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int cB = color_get_b(color);
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int cA = color_get_a(color);
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int tR = color_get_r(tint);
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int tG = color_get_g(tint);
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int tB = color_get_b(tint);
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int tA = color_get_a(tint);
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return color_create_rgba(
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(COLOR_COMPONENT)((cR * tR) / 255),
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(COLOR_COMPONENT)((cG * tG) / 255),
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(COLOR_COMPONENT)((cB * tB) / 255),
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(COLOR_COMPONENT)((cA * tA) / 255)
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);
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}
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static inline COLOR color_tint_alpha(COLOR_COMPONENT alpha, COLOR tint) {
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return color_create_rgba(
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color_get_r(tint),
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color_get_g(tint),
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color_get_b(tint),
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(COLOR_COMPONENT)(((uint32_t)alpha * color_get_a(tint)) / 255)
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);
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}
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static inline void color_convert_rgba_to_rgb(COLOR rgba, COLOR_COMPONENT *r, COLOR_COMPONENT *g, COLOR_COMPONENT *b) {
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COLOR_COMPONENT a = color_get_a(rgba);
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*r = (COLOR_COMPONENT)(((uint32_t)color_get_r(rgba) * a) / 255);
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*g = (COLOR_COMPONENT)(((uint32_t)color_get_g(rgba) * a) / 255);
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*b = (COLOR_COMPONENT)(((uint32_t)color_get_b(rgba) * a) / 255);
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}
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/* -- */
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#define COLOR_WHITE (color_create_rgb(255, 255, 255))
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#define COLOR_RED (color_create_rgb(255, 0, 0))
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#define COLOR_GREEN (color_create_rgb(0, 255, 0))
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#define COLOR_BLUE (color_create_rgb(0, 0, 255))
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#define COLOR_YELLOW (color_create_rgb(255, 255, 0))
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#define COLOR_CYAN (color_create_rgb(0, 255, 255))
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#define COLOR_MAGENTA (color_create_rgb(255, 0, 255))
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#define COLOR_BLACK (color_create_rgb(0, 0, 0))
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#define COLOR_DOS_BLACK (color_create_rgb(0, 0, 0))
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#define COLOR_DOS_BLUE (color_create_rgb(0, 0, 170))
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#define COLOR_DOS_GREEN (color_create_rgb(0, 170, 0))
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#define COLOR_DOS_CYAN (color_create_rgb(0, 170, 170))
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#define COLOR_DOS_RED (color_create_rgb(170, 0, 0))
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#define COLOR_DOS_MAGENTA (color_create_rgb(170, 0, 170))
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#define COLOR_DOS_BROWN (color_create_rgb(170, 85, 0))
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#define COLOR_DOS_WHITE (color_create_rgb(170, 170, 170))
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#define COLOR_DOS_GRAY (color_create_rgb(85, 85, 85))
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#define COLOR_DOS_LIGHT_BLUE (color_create_rgb(85, 85, 255))
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#define COLOR_DOS_LIGHT_GREEN (color_create_rgb(85, 255, 64))
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#define COLOR_DOS_LIGHT_CYAN (color_create_rgb(85, 255, 255))
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#define COLOR_DOS_LIGHT_RED (color_create_rgb(255, 85, 85))
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#define COLOR_DOS_LIGHT_MAGENTA (color_create_rgb(255, 85, 255))
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#define COLOR_DOS_YELLOW (color_create_rgb(255, 255, 85))
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#define COLOR_DOS_BRIGHT_WHITE (color_create_rgb(255, 255, 255))
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#ifdef __cplusplus
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}
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#endif |