/
resize.cs
165 lines (149 loc) · 5.14 KB
/
resize.cs
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//Code from: http://wiki.unity3d.com/index.php/TextureScale
// Only works on ARGB32, RGB24 and Alpha8 textures that are marked readable
using System.Threading;
using UnityEngine;
namespace img_viewer
{
public class TextureScale
{
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;
private static Mutex mutex;
public static void Point(Texture2D tex, int newWidth, int newHeight)
{
ThreadedScale(tex, newWidth, newHeight, false);
}
public static void Bilinear(Texture2D tex, int newWidth, int newHeight)
{
ThreadedScale(tex, newWidth, newHeight, true);
}
private static void ThreadedScale(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;
var cores = Mathf.Min(SystemInfo.processorCount, newHeight);
var slice = newHeight/cores;
finishCount = 0;
if (mutex == null)
{
mutex = new Mutex(false);
}
if (cores > 1)
{
int i = 0;
ThreadData threadData;
for (i = 0; i < cores - 1; i++)
{
threadData = new ThreadData(slice*i, slice*(i + 1));
ParameterizedThreadStart ts = useBilinear
? new ParameterizedThreadStart(BilinearScale)
: new ParameterizedThreadStart(PointScale);
Thread thread = new Thread(ts);
thread.Start(threadData);
}
threadData = new ThreadData(slice*i, newHeight);
if (useBilinear)
{
BilinearScale(threadData);
}
else
{
PointScale(threadData);
}
while (finishCount < cores)
{
Thread.Sleep(1);
}
}
else
{
ThreadData threadData = new ThreadData(0, newHeight);
if (useBilinear)
{
BilinearScale(threadData);
}
else
{
PointScale(threadData);
}
}
tex.Resize(newWidth, newHeight);
tex.SetPixels(newColors);
tex.Apply();
}
public static void BilinearScale(System.Object obj)
{
ThreadData threadData = (ThreadData) obj;
for (var y = threadData.start; y < threadData.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);
}
}
mutex.WaitOne();
finishCount++;
mutex.ReleaseMutex();
}
public static void PointScale(System.Object obj)
{
ThreadData threadData = (ThreadData) obj;
for (var y = threadData.start; y < threadData.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)];
}
}
mutex.WaitOne();
finishCount++;
mutex.ReleaseMutex();
}
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);
}
}
}