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GitHub Repository: hrydgard/ppsspp
 Path: blob/master/Common/Data/Color/RGBAUtil.cpp
Views: 1401
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#include "Common/Data/Color/RGBAUtil.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 = (int32_t)(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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