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115 lines
2.8 KiB
C++
115 lines
2.8 KiB
C++
#include "base/colorutil.h"
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template <typename T>
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static T clamp(T f, T low, T high) {
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if (f < low)
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return low;
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if (f > high)
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return high;
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return f;
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}
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uint32_t whiteAlpha(float alpha) {
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if (alpha < 0.0f) alpha = 0.0f;
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if (alpha > 1.0f) alpha = 1.0f;
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uint32_t color = (int)(alpha*255) << 24;
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color |= 0xFFFFFF;
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return color;
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}
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uint32_t blackAlpha(float alpha) {
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if (alpha < 0.0f) alpha = 0.0f;
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if (alpha > 1.0f) alpha = 1.0f;
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return (int)(alpha*255)<<24;
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}
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uint32_t colorAlpha(uint32_t rgb, float alpha) {
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if (alpha < 0.0f) alpha = 0.0f;
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if (alpha > 1.0f) alpha = 1.0f;
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return ((int)(alpha*255)<<24) | (rgb & 0xFFFFFF);
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}
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uint32_t colorBlend(uint32_t rgb1, uint32_t rgb2, float alpha) {
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float invAlpha = (1.0f - alpha);
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int r = (int)(((rgb1 >> 0) & 0xFF) * alpha + ((rgb2 >> 0) & 0xFF) * invAlpha);
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int g = (int)(((rgb1 >> 8) & 0xFF) * alpha + ((rgb2 >> 8) & 0xFF) * invAlpha);
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int b = (int)(((rgb1 >> 16) & 0xFF) * alpha + ((rgb2 >> 16) & 0xFF) * invAlpha);
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int a = (int)(((rgb1 >> 24) & 0xFF) * alpha + ((rgb2 >> 24) & 0xFF) * invAlpha);
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uint32_t c = clamp(a, 0, 255) << 24;
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c |= clamp(b, 0, 255) << 16;
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c |= clamp(g, 0, 255) << 8;
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c |= clamp(r, 0, 255);
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return c;
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}
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uint32_t alphaMul(uint32_t color, float alphaMul) {
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uint32_t rgb = color & 0xFFFFFF;
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int32_t alpha = color >> 24;
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alpha *= alphaMul;
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if (alpha < 0) alpha = 0;
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if (alpha > 255) alpha = 255;
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return (alpha << 24) | (rgb & 0xFFFFFF);
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}
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uint32_t rgba(float r, float g, float b, float alpha) {
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uint32_t color = (int)(alpha*255)<<24;
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color |= (int)(b*255)<<16;
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color |= (int)(g*255)<<8;
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color |= (int)(r*255);
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return color;
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}
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uint32_t rgba_clamp(float r, float g, float b, float a) {
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return rgba(clamp(r, 0.0f, 1.0f), clamp(g, 0.0f, 1.0f), clamp(b, 0.0f, 1.0f), clamp(a, 0.0f, 1.0f));
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}
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/* hsv2rgb.c
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* Convert Hue Saturation Value to Red Green Blue
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*
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* P.J. 08-Aug-98
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*
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* Reference:
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* D. F. Rogers
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* Procedural Elements for Computer Graphics
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* McGraw Hill 1985
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*/
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uint32_t hsva(float H, float S, float V, float alpha) {
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/*
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* Purpose:
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* Convert HSV values to RGB values
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* All values are in the range [0.0 .. 1.0]
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*/
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float F, M, N, K;
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int I;
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if ( S == 0.0 ) {
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// Achromatic case, set level of grey
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return rgba(V, V, V, alpha);
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} else {
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/*
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* Determine levels of primary colours.
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*/
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if (H >= 1.0) {
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H = 0.0;
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} else {
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H = H * 6;
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}
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I = (int) H; /* should be in the range 0..5 */
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F = H - I; /* fractional part */
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M = V * (1 - S);
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N = V * (1 - S * F);
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K = V * (1 - S * (1 - F));
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float r, g, b;
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if (I == 0) { r = V; g = K; b = M; }
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else if (I == 1) { r = N; g = V; b = M; }
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else if (I == 2) { r = M; g = V; b = K; }
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else if (I == 3) { r = M; g = N; b = V; }
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else if (I == 4) { r = K; g = M; b = V; }
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else if (I == 5) { r = V; g = M; b = N; }
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else return 0;
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return rgba(r, g, b, alpha);
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}
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}
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