MA_TextureAtlasser/Assets/MA_ToolBox/MA_Utilities/TextureUtils/MA_TextureUtils.cs
max 696ef848e0 Bugfixes: Texture point scale.
Bugfixes: Texture point scale.
Test Unity2019.3.
2020-04-13 18:03:44 +02:00

233 lines
7.6 KiB
C#

//https://github.com/maxartz15/MA_TextureUtils
//References:
//http://www.gamasutra.com/blogs/JoshSutphin/20131007/201829/Adding_to_Unitys_BuiltIn_Classes_Using_Extension_Methods.php
//https://forum.unity3d.com/threads/contribution-texture2d-blur-in-c.185694/
//http://orbcreation.com/orbcreation/page.orb?1180
//https://support.unity3d.com/hc/en-us/articles/206486626-How-can-I-get-pixels-from-unreadable-textures-
//https://github.com/maxartz15/MA_TextureAtlasser/commit/9f5240967a51692fa2a17a6b3c8d124dd5dc60f9
#if UNITY_EDITOR
using UnityEngine;
using UnityEditor;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System;
namespace MA_Texture
{
public static class MA_TextureUtils
{
public static Texture ConvertToReadableTexture(Texture texture)
{
if (texture == null)
return texture;
// Create a temporary RenderTexture of the same size as the texture
RenderTexture tmp = RenderTexture.GetTemporary(
texture.width,
texture.height,
0,
RenderTextureFormat.Default,
RenderTextureReadWrite.Linear);
// Blit the pixels on texture to the RenderTexture
Graphics.Blit(texture, tmp);
// Backup the currently set RenderTexture
RenderTexture previous = RenderTexture.active;
// Set the current RenderTexture to the temporary one we created
RenderTexture.active = tmp;
// Create a new readable Texture2D to copy the pixels to it
Texture2D myTexture2D = new Texture2D(texture.width, texture.height);
// Copy the pixels from the RenderTexture to the new Texture
myTexture2D.ReadPixels(new Rect(0, 0, tmp.width, tmp.height), 0, 0);
myTexture2D.Apply();
myTexture2D.name = texture.name;
// Reset the active RenderTexture
RenderTexture.active = previous;
// Release the temporary RenderTexture
RenderTexture.ReleaseTemporary(tmp);
// "myTexture2D" now has the same pixels from "texture" and it's readable.
return myTexture2D;
}
#region Save
public static Texture2D MA_Save2D(this Texture2D texture, string textureName, string savePath)
{
if (!Directory.Exists(savePath))
Directory.CreateDirectory(savePath);
FileStream fs = new FileStream(savePath + "/" + textureName + ".png", FileMode.Create);
BinaryWriter bw = new BinaryWriter(fs);
bw.Write(texture.EncodeToPNG());
bw.Close();
fs.Close();
AssetDatabase.Refresh();
return texture;
}
public static Texture MA_Save(this Texture texture, string name, string savePath)
{
Texture2D texture2D = (Texture2D)MA_TextureUtils.ConvertToReadableTexture(texture);
texture2D.MA_Save2D(name, savePath);
texture = texture2D;
return texture;
}
#endregion
#region Scale
public enum TextureScaleMode
{
Bilinear,
Point
}
public static Texture MA_Scale(this Texture texture, int width, int height, TextureScaleMode scaleMode)
{
Texture2D texture2D = (Texture2D)MA_TextureUtils.ConvertToReadableTexture(texture);
texture2D.MA_Scale2D(width, height, scaleMode);
texture = texture2D;
return texture;
}
public static Texture2D MA_Scale2D(this Texture2D texture, int newWidth, int newHeight, TextureScaleMode scaleMode)
{
Color[] curColors = texture.GetPixels();
Color[] newColors = new Color[newWidth * newHeight];
switch (scaleMode)
{
case TextureScaleMode.Bilinear:
newColors = MA_BilinearScale(curColors, texture.width, texture.height, newWidth, newHeight);
break;
case TextureScaleMode.Point:
newColors = MA_PointScale(curColors, texture.width, texture.height, newWidth, newHeight);
break;
}
texture.Resize(newWidth, newHeight);
texture.SetPixels(newColors);
texture.Apply();
return texture;
}
private static Color[] MA_BilinearScale(Color[] curColors, int curWidth, int curHeight, int newWidth, int newHeight)
{
Color[] newColors = new Color[newWidth * newHeight];
float ratioX = 1.0f / ((float)newWidth / (curWidth - 1));
float ratioY = 1.0f / ((float)newHeight / (curHeight - 1));
for (int y = 0; y < newHeight; y++)
{
int yFloor = Mathf.FloorToInt(y * ratioY);
var y1 = yFloor * curWidth;
var y2 = (yFloor + 1) * curWidth;
var yw = y * newWidth;
for (int x = 0; x < newWidth; x++)
{
int xFloor = Mathf.FloorToInt(x * ratioX);
var xLerp = x * ratioX - xFloor;
newColors[yw + x] = ColorLerpUnclamped(ColorLerpUnclamped(curColors[y1 + xFloor], curColors[y1 + xFloor + 1], xLerp),
ColorLerpUnclamped(curColors[y2 + xFloor], curColors[y2 + xFloor + 1], xLerp),
y * ratioY - yFloor);
}
}
return newColors;
}
private static Color[] MA_PointScale(Color[] curColors, int curWidth, int curHeight, int newWidth, int newHeight)
{
Color[] newColors = new Color[newWidth * newHeight];
float ratioX = 1.0f / ((float)newWidth / (curWidth - 1));
float ratioY = 1.0f / ((float)newHeight / (curHeight - 1));
for (int y = 0; y < newHeight; y++)
{
int yFloor = Mathf.FloorToInt(y * ratioY);
var y1 = (yFloor + 1) * curWidth;
var yw = y * newWidth;
for (int x = 0; x < newWidth; x++)
{
int xFloor = Mathf.FloorToInt(x * ratioX);
newColors[yw + x] = curColors[Mathf.RoundToInt(y1 + xFloor)];
}
}
return newColors;
}
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);
}
#endregion
#region combine
public static Texture2D MA_Combine2D(this Texture2D texture, Texture2D combineTexture, int offsetX, int offsetY, bool flipY = true)
{
for (int x = 0; x < combineTexture.width; x++)
{
if(flipY)
{
//Y is 'flipped' because textures are made from left to right, bottom to top. We want to draw from left to right and top to bottom.
for (int y = combineTexture.height; y > 0; y--)
{
texture.SetPixel(x + offsetX, y + (texture.height - offsetY - combineTexture.height), combineTexture.GetPixel(x, y));
}
}
else
{
for (int y = 0; y < combineTexture.height; y++)
{
texture.SetPixel(x + offsetX, y + offsetY, combineTexture.GetPixel(x, y));
}
}
}
texture.Apply();
return texture;
}
public static Texture MA_Combine(this Texture texture, Texture combineTexture, int offsetX, int offsetY)
{
Texture2D texture2D = (Texture2D)MA_TextureUtils.ConvertToReadableTexture(texture);
Texture2D combineTexture2D = (Texture2D)MA_TextureUtils.ConvertToReadableTexture(combineTexture);
texture = texture2D.MA_Combine2D(combineTexture2D, offsetX, offsetY);
return texture;
}
#endregion
}
}
#endif