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101 lines
2.2 KiB
C++
101 lines
2.2 KiB
C++
#pragma once
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#include <algorithm>
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#include <stdint.h>
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// Beware of windows.h :(
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#ifdef max
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#undef min
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#undef max
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#endif
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struct PalEntry
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{
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PalEntry() = default;
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PalEntry(const PalEntry&) = default;
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constexpr PalEntry (uint32_t argb) : d(argb) { }
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operator uint32_t () const { return d; }
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void SetRGB(PalEntry other)
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{
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d = other.d & 0xffffff;
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}
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PalEntry Modulate(PalEntry other) const
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{
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if (isWhite())
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{
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return other;
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}
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else if (other.isWhite())
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{
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return *this;
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}
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else
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{
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other.r = (r * other.r) / 255;
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other.g = (g * other.g) / 255;
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other.b = (b * other.b) / 255;
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return other;
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}
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}
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constexpr int Luminance() const
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{
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return (r * 77 + g * 143 + b * 37) >> 8;
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}
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constexpr int Amplitude() const
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{
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return std::max(r, std::max(g, b));
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}
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constexpr void Decolorize() // this for 'nocoloredspritelighting' and not the same as desaturation. The normal formula results in a value that's too dark.
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{
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int v = (r + g + b);
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r = g = b = ((255*3) + v + v) / 9;
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}
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constexpr bool isBlack() const
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{
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return (d & 0xffffff) == 0;
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}
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constexpr bool isWhite() const
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{
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return (d & 0xffffff) == 0xffffff;
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}
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PalEntry &operator= (const PalEntry &other) = default;
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constexpr PalEntry &operator= (uint32_t other) { d = other; return *this; }
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constexpr PalEntry InverseColor() const { PalEntry nc(a, 255 - r, 255 - g, 255 - b); return nc; }
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#ifdef __BIG_ENDIAN__
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constexpr PalEntry (uint8_t ir, uint8_t ig, uint8_t ib) : a(0), r(ir), g(ig), b(ib) {}
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constexpr PalEntry (uint8_t ia, uint8_t ir, uint8_t ig, uint8_t ib) : a(ia), r(ir), g(ig), b(ib) {}
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union
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{
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struct
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{
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uint8_t a,r,g,b;
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};
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uint32_t d;
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};
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#else
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constexpr PalEntry (uint8_t ir, uint8_t ig, uint8_t ib) : b(ib), g(ig), r(ir), a(0) {}
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constexpr PalEntry (uint8_t ia, uint8_t ir, uint8_t ig, uint8_t ib) : b(ib), g(ig), r(ir), a(ia) {}
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union
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{
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struct
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{
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uint8_t b,g,r,a;
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};
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uint32_t d;
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};
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#endif
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};
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constexpr inline int Luminance(int r, int g, int b)
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{
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return (r * 77 + g * 143 + b * 37) >> 8;
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}
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#define APART(c) (((c)>>24)&0xff)
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#define RPART(c) (((c)>>16)&0xff)
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#define GPART(c) (((c)>>8)&0xff)
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#define BPART(c) ((c)&0xff)
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#define MAKERGB(r,g,b) uint32_t(((r)<<16)|((g)<<8)|(b))
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#define MAKEARGB(a,r,g,b) uint32_t(((a)<<24)|((r)<<16)|((g)<<8)|(b))
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