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93 lines
2.3 KiB
C++
93 lines
2.3 KiB
C++
// This code is in the public domain -- castanyo@yahoo.es
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#pragma once
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#ifndef NV_MATH_COLOR_INL
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#define NV_MATH_COLOR_INL
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#include "Color.h"
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#include "Vector.inl"
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namespace nv
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{
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/// Clamp color components.
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inline Vector3 colorClamp(Vector3::Arg c)
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{
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return Vector3(clamp(c.x, 0.0f, 1.0f), clamp(c.y, 0.0f, 1.0f), clamp(c.z, 0.0f, 1.0f));
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}
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/// Clamp without allowing the hue to change.
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inline Vector3 colorNormalize(Vector3::Arg c)
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{
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float scale = 1.0f;
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if (c.x > scale) scale = c.x;
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if (c.y > scale) scale = c.y;
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if (c.z > scale) scale = c.z;
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return c / scale;
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}
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/// Convert Color32 to Color16.
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inline Color16 toColor16(Color32 c)
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{
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Color16 color;
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// rrrrrggggggbbbbb
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// rrrrr000gggggg00bbbbb000
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// color.u = (c.u >> 3) & 0x1F;
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// color.u |= (c.u >> 5) & 0x7E0;
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// color.u |= (c.u >> 8) & 0xF800;
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color.r = c.r >> 3;
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color.g = c.g >> 2;
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color.b = c.b >> 3;
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return color;
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}
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/// Promote 16 bit color to 32 bit using regular bit expansion.
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inline Color32 toColor32(Color16 c)
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{
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Color32 color;
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// c.u = ((col0.u << 3) & 0xf8) | ((col0.u << 5) & 0xfc00) | ((col0.u << 8) & 0xf80000);
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// c.u |= (c.u >> 5) & 0x070007;
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// c.u |= (c.u >> 6) & 0x000300;
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color.b = (c.b << 3) | (c.b >> 2);
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color.g = (c.g << 2) | (c.g >> 4);
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color.r = (c.r << 3) | (c.r >> 2);
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color.a = 0xFF;
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return color;
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}
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inline Color32 toColor32(Vector4::Arg v)
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{
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Color32 color;
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color.r = uint8(clamp(v.x, 0.0f, 1.0f) * 255);
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color.g = uint8(clamp(v.y, 0.0f, 1.0f) * 255);
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color.b = uint8(clamp(v.z, 0.0f, 1.0f) * 255);
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color.a = uint8(clamp(v.w, 0.0f, 1.0f) * 255);
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return color;
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}
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inline Vector4 toVector4(Color32 c)
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{
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const float scale = 1.0f / 255.0f;
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return Vector4(c.r * scale, c.g * scale, c.b * scale, c.a * scale);
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}
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inline float perceptualColorDistance(Vector3::Arg c0, Vector3::Arg c1)
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{
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float rmean = (c0.x + c1.x) * 0.5f;
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float r = c1.x - c0.x;
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float g = c1.y - c0.y;
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float b = c1.z - c0.z;
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return sqrtf((2 + rmean)*r*r + 4*g*g + (3 - rmean)*b*b);
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}
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} // nv namespace
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#endif // NV_MATH_COLOR_INL
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