66 lines
2.0 KiB
C#
66 lines
2.0 KiB
C#
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using UnityEngine;
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namespace Unity.PlasticSCM.Editor.UI.Avatar
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{
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internal static class ApplyCircleMask
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{
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internal static Texture2D For(Texture2D sourceImage)
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{
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int centerx = sourceImage.width / 2;
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int centery = sourceImage.height / 2;
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int radius = sourceImage.width / 2;
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Texture2D result = Images.GetNewTextureFromTexture(sourceImage);
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for (int i = (centerx - radius); i < centerx + radius; i++)
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{
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for (int j = (centery - radius); j < centery + radius; j++)
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{
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float dx = i - centerx;
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float dy = j - centery;
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float d = Mathf.Sqrt(dx * dx + dy * dy);
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float borderSize = 1f;
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if (d <= (radius - borderSize))
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{
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result.SetPixel(
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i - (centerx - radius),
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j - (centery - radius),
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sourceImage.GetPixel(i, j));
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continue;
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}
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Color color = sourceImage.GetPixel(i, j);
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result.SetPixel(
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i - (centerx - radius),
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j - (centery - radius),
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Color.Lerp(Color.clear, color,
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GetAntialiasAlpha(radius, d, borderSize)));
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}
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}
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result.Apply();
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return result;
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}
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static float GetAntialiasAlpha(float radius, float d, float borderSize)
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{
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if (d >= (radius + borderSize))
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return 0f;
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if (d - radius - borderSize == 0)
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return 0;
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float proportion =
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Mathf.Abs(d - radius - borderSize) /
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(radius + borderSize) - (radius - borderSize);
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return Mathf.Max(0, 1.0f - proportion);
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}
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}
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}
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