Unity Texture2D的裁剪、镜像、翻转、缩放、合并、分辨率
本人最近做了一个拍照并打印的程序，使用到了多种图片编辑功能，现在罗列一下，希望对大家有所帮助。
裁剪，将贴图上的某个区域裁剪
/// <summary>
/// 裁剪Texture2D
/// </summary>
/// <param name="originalTexture"></param>
/// <param name="offsetX"></param>
/// <param name="offsetY"></param>
/// <param name="originalWidth"></param>
/// <param name="originalHeight"></param>
/// <returns></returns>
public static Texture2D ScaleTextureCutOut(Texture2D originalTexture, int offsetX,int offsetY, float originalWidth, float originalHeight)
{
Texture2D newTexture = new Texture2D(Mathf.CeilToInt(originalWidth), Mathf.CeilToInt(originalHeight));
int maxX = originalTexture.width - 1;
int maxY = originalTexture.height - 1;
for (int y = 0; y < newTexture.height; y++)
{
for (int x = 0; x < newTexture.width; x++)
{
float targetX = x + offsetX;
float targetY = y + offsetY;
int x1 = Mathf.Min(maxX, Mathf.FloorToInt(targetX));
int y1 = Mathf.Min(maxY, Mathf.FloorToInt(targetY));
int x2 = Mathf.Min(maxX, x1 + 1);
int y2 = Mathf.Min(maxY, y1 + 1);
float u = targetX - x1;
float v = targetY - y1;
float w1 = (1 - u) * (1 - v);
float w2 = u * (1 - v);
float w3 = (1 - u) * v;
float w4 = u * v;
Color color1 = originalTexture.GetPixel(x1, y1);
Color color2 = originalTexture.GetPixel(x2, y1);
Color color3 = originalTexture.GetPixel(x1, y2);
Color color4 = originalTexture.GetPixel(x2, y2);
Color color = new Color(Mathf.Clamp01(color1.r * w1 + color2.r * w2 + color3.r * w3 + color4.r * w4),
Mathf.Clamp01(color1.g * w1 + color2.g * w2 + color3.g * w3 + color4.g * w4),
Mathf.Clamp01(color1.b * w1 + color2.b * w2 + color3.b * w3 + color4.b * w4),
Mathf.Clamp01(color1.a * w1 + color2.a * w2 + color3.a * w3 + color4.a * w4)
);
newTexture.SetPixel(x, y, color);
}
}
newTexture.anisoLevel = 2;
newTexture.Apply();
return newTexture;
}缩放，缩放和放大原有贴图
/// <summary>
/// 缩放Textur2D
/// </summary>
/// <param name="source"></param>
/// <param name="targetWidth"></param>
/// <param name="targetHeight"></param>
/// <returns></returns>
public static Texture2D ScaleTexture(Texture2D source, float targetWidth, float targetHeight)
{
Texture2D result = new Texture2D((int)targetWidth, (int)targetHeight, source.format, false);
float incX = (1.0f / targetWidth);
float incY = (1.0f / targetHeight);
for (int i = 0; i < result.height; ++i)
{
for (int j = 0; j < result.width; ++j)
{
Color newColor = source.GetPixelBilinear((float)j / (float)result.width, (float)i / (float)result.height);
result.SetPixel(j, i, newColor);
}
}
result.Apply();
return result;
}水平镜像
//水平翻转
public static Texture2D HorizontalFlipTexture(Texture2D texture)
{
//得到图片的宽高
int width = texture.width;
int height = texture.height;
Texture2D flipTexture = new Texture2D(width, height);
for (int i = 0; i < width; i++)
{
flipTexture.SetPixels(i, 0, 1, height, texture.GetPixels(width - i - 1, 0, 1, height));
}
flipTexture.Apply();
return flipTexture;
}垂直镜像
// 垂直翻转
public static Texture2D VerticalFlipTexture(Texture2D texture)
{
//得到图片的宽高
int width = texture.width;
int height = texture.height;
Texture2D flipTexture = new Texture2D(width, height);
for (int i = 0; i < height; i++)
{
flipTexture.SetPixels(0, i, width, 1, texture.GetPixels(0, height - i - 1, width, 1));
}
flipTexture.Apply();
return flipTexture;
}逆时针旋转90度
/// <summary>
/// 图片逆时针旋转90度
/// </summary>
/// <param name="src">原图片二进制数据</param>
/// <param name="srcW">原图片宽度</param>
/// <param name="srcH">原图片高度</param>
/// <param name="desTexture">输出目标图片</param>
public static Texture2D RotationLeft90(Color32[] src, int srcW, int srcH)
{
Color32[] des = new Color32[src.Length];
Texture2D desTexture = new Texture2D(srcH, srcW);
//if (desTexture.width != srcH || desTexture.height != srcW)
//{
// desTexture.Resize(srcH, srcW);
//}
for (int i = 0; i < srcW; i++)
{
for (int j = 0; j < srcH; j++)
{
des[i * srcH + j] = src[(srcH - 1 - j) * srcW + i];
}
}
desTexture.SetPixels32(des);
desTexture.Apply();
return desTexture;
}顺时针旋转90度
/// <summary>
/// 图片顺时针旋转90度
/// </summary>
/// <param name="src">原图片二进制数据</param>
/// <param name="srcW">原图片宽度</param>
/// <param name="srcH">原图片高度</param>
/// <param name="desTexture">输出目标图片</param>
public static Texture2D RotationRight90(Color32[] src, int srcW, int srcH)
{
Color32[] des = new Color32[src.Length];
Texture2D desTexture = new Texture2D(srcH, srcW);
for (int i = 0; i < srcH; i++)
{
for (int j = 0; j < srcW; j++)
{
des[(srcW - j - 1) * srcH + i] = src[i * srcW + j];
}
}
desTexture.SetPixels32(des);
desTexture.Apply();
return desTexture;
}两张贴图合并，可以实现水印等功能，该代码是我实现3行3列9张相同照片排列
/// <summary>
/// 两张图合并
/// </summary>
/// <param name="_baseTexture2D"></param>
/// <param name="_texture2D"></param>
/// <param name="_x"></param>
/// <param name="_y"></param>
/// <param name="_w"></param>
/// <param name="_h"></param>
/// <returns></returns>
public static Texture2D MergeImage(Texture2D _baseTexture2D, Texture2D _texture2D,int _x,int _y,int _w,int _h)
{
//取图
Color32[] color = _texture2D.GetPixels32(0);
for (int j = 0; j < 3; j++)
{
for (int i = 0; i < 3; i++)
{
_baseTexture2D.SetPixels32(_x + i * (_texture2D.width+ _w), _y + j * (_texture2D.height+_h), _texture2D.width, _texture2D.height, color); //宽度
}
}
//应用
_baseTexture2D.Apply();
return _baseTexture2D;
}修改图片的水平和垂直分辨率(像素/英寸，每英寸距离的图像包含的像素数目。)
Bitmap操作需要用到System.Drawing.dll，请自行下载！
/// <summary>
/// 修改图片水平和垂直像素量
/// </summary>
public static Texture2D SetPictureResolution(string _path)
{
Bitmap bm = new Bitmap(_path);
bm.SetResolution(300, 300);
string _idPath = Application.persistentDataPath + "/";
string _name = "print.jpg";
bm.Save(_idPath + _name, ImageFormat.Jpeg);
Texture2D tex = loadTexture(_idPath, _name);
File.WriteAllBytes(Application.persistentDataPath + "/aa.jpg", tex.EncodeToJPG());
bm.Dispose();
return tex;
}