40 lines
1.2 KiB
C++
40 lines
1.2 KiB
C++
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#include "engine/pixel.h"
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#include <algorithm>
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#include "engine/math.h"
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uint32_t ShadeColor(uint32_t c, float k)
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{
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const float r = Clampf(float(c & 0xFF) * k, 0.0f, 255.0f);
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const float g = Clampf(float((c >> 8) & 0xFF) * k, 0.0f, 255.0f);
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const float b = Clampf(float((c >> 16) & 0xFF) * k, 0.0f, 255.0f);
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return RGBA(uint8_t(r), uint8_t(g), uint8_t(b), AlphaOf(c));
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}
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void DiamondRowN(int y, int dw, int dh, int& x0, int& x1)
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{
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const int half = std::max(1, dh / 2);
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const int k = (y < half) ? y : (dh - 1 - y);
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const int width = std::max(1, (dw / half) * (k + 1));
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x0 = (dw - width) / 2;
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x1 = x0 + width;
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}
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void OutlineSilhouette(Sprite& s, uint32_t outline)
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{
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Sprite copy = s;
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for (int y = 0; y < s.h; ++y)
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{
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for (int x = 0; x < s.w; ++x)
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{
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if (AlphaOf(copy.Get(x, y)) == 0) continue;
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const bool border =
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x == 0 || y == 0 || x == s.w - 1 || y == s.h - 1 ||
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AlphaOf(copy.Get(x - 1, y)) == 0 || AlphaOf(copy.Get(x + 1, y)) == 0 ||
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AlphaOf(copy.Get(x, y - 1)) == 0 || AlphaOf(copy.Get(x, y + 1)) == 0;
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if (border) s.Set(x, y, outline);
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}
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}
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}
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