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ImageExtensions.cs - Improve Blend function when blending with a color

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miku-666
2023-04-10 11:01:23 +02:00
parent 4b105ab819
commit 60fbdfe795
1 changed files with 31 additions and 4 deletions
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35
PCK-Studio/Classes/Extensions/ImageExtensions.cs
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@@ -141,11 +141,38 @@ namespace PckStudio.Extensions
return image;
}
public static Image Blend(this Image bg, Color foregroundColor, BlendMode mode)
public static Image Blend(this Image image, Color foregroundColor, BlendMode mode)
{
Bitmap bitmap = new Bitmap(bg);
bitmap.Fill(foregroundColor);
return bg.Blend(bitmap, mode);
if (image is not Bitmap baseImage)
return image;
BitmapData baseImageData = baseImage.LockBits(new Rectangle(Point.Empty, baseImage.Size),
ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
byte[] baseImageBuffer = new byte[baseImageData.Stride * baseImageData.Height];
Marshal.Copy(baseImageData.Scan0, baseImageBuffer, 0, baseImageBuffer.Length);
float overlayR = foregroundColor.R / 255f;
float overlayG = foregroundColor.G / 255f;
float overlayB = foregroundColor.B / 255f;
for (int k = 0; k < baseImageBuffer.Length; k += 4)
{
baseImageBuffer[k + 0] = CalculateColorComponentBlendValue(baseImageBuffer[k + 0] / 255f, overlayR, mode);
baseImageBuffer[k + 1] = CalculateColorComponentBlendValue(baseImageBuffer[k + 1] / 255f, overlayG, mode);
baseImageBuffer[k + 2] = CalculateColorComponentBlendValue(baseImageBuffer[k + 2] / 255f, overlayB, mode);
}
Bitmap bitmapResult = new Bitmap(baseImage.Width, baseImage.Height, PixelFormat.Format32bppArgb);
BitmapData resultImageData = bitmapResult.LockBits(new Rectangle(Point.Empty, bitmapResult.Size),
ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
Marshal.Copy(baseImageBuffer, 0, resultImageData.Scan0, baseImageBuffer.Length);
bitmapResult.UnlockBits(resultImageData);
baseImage.UnlockBits(baseImageData);
return bitmapResult;
}
public static Image Blend(this Image image, Image overlay, BlendMode mode)