MA_TextureAtlasser/MA_ToolBox/MA_Utilities/TextureUtils/TextureScaler.cs

103 lines
2.3 KiB
C#

using System.Threading;
using UnityEngine;
namespace MA_Texture
{
public static class TextureScaler
{
public class ThreadData
{
public int start;
public int end;
public ThreadData (int s, int e) {
start = s;
end = e;
}
}
private static Color[] texColors;
private static Color[] newColors;
private static int w;
private static float ratioX;
private static float ratioY;
private static int w2;
private static int finishCount;
public static void Scale (Texture2D tex, int newWidth, int newHeight, bool useBilinear)
{
texColors = tex.GetPixels();
newColors = new Color[newWidth * newHeight];
if (useBilinear)
{
ratioX = 1.0f / ((float)newWidth / (tex.width-1));
ratioY = 1.0f / ((float)newHeight / (tex.height-1));
}
else {
ratioX = ((float)tex.width) / newWidth;
ratioY = ((float)tex.height) / newHeight;
}
w = tex.width;
w2 = newWidth;
finishCount = 0;
if (useBilinear)
{
BilinearScale(0, newHeight);
}
else
{
PointScale(0, newHeight);
}
tex.Resize(newWidth, newHeight);
tex.SetPixels(newColors);
tex.Apply();
texColors = null;
newColors = null;
}
public static void BilinearScale (int start, int end)
{
for (var y = start; y < end; y++)
{
int yFloor = (int)Mathf.Floor(y * ratioY);
var y1 = yFloor * w;
var y2 = (yFloor+1) * w;
var yw = y * w2;
for (var x = 0; x < w2; x++) {
int xFloor = (int)Mathf.Floor(x * ratioX);
var xLerp = x * ratioX-xFloor;
newColors[yw + x] = ColorLerpUnclamped(ColorLerpUnclamped(texColors[y1 + xFloor], texColors[y1 + xFloor+1], xLerp),
ColorLerpUnclamped(texColors[y2 + xFloor], texColors[y2 + xFloor+1], xLerp),
y*ratioY-yFloor);
}
}
finishCount++;
}
public static void PointScale (int start, int end)
{
for (var y = start; y < end; y++)
{
var thisY = (int)(ratioY * y) * w;
var yw = y * w2;
for (var x = 0; x < w2; x++) {
newColors[yw + x] = texColors[(int)(thisY + ratioX*x)];
}
}
finishCount++;
}
private static Color ColorLerpUnclamped (Color c1, Color c2, float value)
{
return new Color (c1.r + (c2.r - c1.r)*value,
c1.g + (c2.g - c1.g)*value,
c1.b + (c2.b - c1.b)*value,
c1.a + (c2.a - c1.a)*value);
}
}
}