public static void Blend(this Texture2D sourceTex, Color[] brushPixels, BrushRect rect, BlendModes blendMode = BlendModes.Normal)
{
if (!IsBrushRectCorrect(rect, sourceTex))
{
Debug.LogError("Couldn't blend textures! Brush rectangle was outside of bounds.");
return;
}
var canvasPixels = sourceTex.GetPixels(rect.X, rect.Y, rect.Width, rect.Height);
var brushColors = brushPixels;
var blending = BlendingManager.GetBlendingService(blendMode);
for (int i = 0; i < canvasPixels.Length; i++)
{
canvasPixels[i] = blending.Blend(canvasPixels[i], brushColors[i]);
}
// Setting source texture pixels. BrushRect coordinates are relative to canvas,
// so we can use it to know which pixels to set on canvas.
sourceTex.SetPixels(rect.X, rect.Y, rect.Width, rect.Height, canvasPixels);
}
/// <summary>
/// Checks if brush rect is contained inside texture.
/// </summary>
public static bool IsBrushRectCorrect(BrushRect rect, Texture2D texture)
{
return(rect.X + rect.Width <= texture.width &&
rect.Y + rect.Height <= texture.height);
}