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PortableImage has 32-bit components, but ManagedImage only supports 8-bit values. A direct BlockCopy of the two is invalid and needs to be done by manually converting each 32-bit color value to an 8-bit color (just simple truncation/casting)

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nooperation
2025-04-26 00:30:49 -04:00
parent acf9598873
commit fcb71bd12d
1 changed files with 26 additions and 23 deletions
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49
LibreMetaverse/Imaging/ManagedImage.cs
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@@ -114,6 +114,20 @@ namespace OpenMetaverse.Imaging
Bump = new byte[n];
}
/// <summary>
/// Converts an array of 32-bit color values to an array of 8-bit color values
/// </summary>
/// <param name="sourceData">The input array of 32-bit color values</param>
/// <param name="destinationData">The output array of 8-bit color values</param>
private static void ConvertTo8BitChannel(int[] sourceData, out byte[] destinationData)
{
destinationData = new byte[sourceData.Length];
for (var i = 0; i < sourceData.Length; i++)
{
destinationData[i] = (byte)sourceData[i];
}
}
/// <summary>
/// Constructs ManagedImage class from <see cref="PortableImage"/>
/// Currently only supporting 8-bit channels;
@@ -123,46 +137,35 @@ namespace OpenMetaverse.Imaging
{
Width = image.Width;
Height = image.Height;
var pixelCount = Width * Height;
var numComp = image.NumberOfComponents;
switch (numComp)
{
case 1:
Channels = ImageChannels.Gray;
Red = new byte[pixelCount * sizeof(int)];
Buffer.BlockCopy(image.GetComponent(0), 0, Red, 0, Red.Length);
ConvertTo8BitChannel(image.GetComponent(0), out Red);
break;
case 2:
Channels = ImageChannels.Color;
Red = new byte[pixelCount * sizeof(int)];
Green = new byte[pixelCount * sizeof(int)];
Buffer.BlockCopy(image.GetComponent(0), 0, Red, 0, Red.Length);
Buffer.BlockCopy(image.GetComponent(1), 0, Green, 0, Green.Length);
ConvertTo8BitChannel(image.GetComponent(0), out Red);
ConvertTo8BitChannel(image.GetComponent(1), out Green);
break;
case 3:
Channels = ImageChannels.Color;
Red = new byte[pixelCount * sizeof(int)];
Green = new byte[pixelCount * sizeof(int)];
Blue = new byte[pixelCount * sizeof(int)];
Buffer.BlockCopy(image.GetComponent(0), 0, Red, 0, Red.Length);
Buffer.BlockCopy(image.GetComponent(1), 0, Green, 0, Green.Length);
Buffer.BlockCopy(image.GetComponent(2), 0, Blue, 0, Blue.Length);
ConvertTo8BitChannel(image.GetComponent(0), out Red);
ConvertTo8BitChannel(image.GetComponent(1), out Green);
ConvertTo8BitChannel(image.GetComponent(2), out Blue);
break;
case 4:
Channels = ImageChannels.Alpha | ImageChannels.Color;
Red = new byte[pixelCount * sizeof(int)];
Green = new byte[pixelCount * sizeof(int)];
Blue = new byte[pixelCount * sizeof(int)];
Alpha = new byte[pixelCount * sizeof(int)];
Buffer.BlockCopy(image.GetComponent(0), 0, Red, 0, Red.Length);
Buffer.BlockCopy(image.GetComponent(1), 0, Green, 0, Green.Length);
Buffer.BlockCopy(image.GetComponent(2), 0, Blue, 0, Blue.Length);
Buffer.BlockCopy(image.GetComponent(3), 0, Alpha, 0, Alpha.Length);
ConvertTo8BitChannel(image.GetComponent(0), out Red);
ConvertTo8BitChannel(image.GetComponent(1), out Green);
ConvertTo8BitChannel(image.GetComponent(2), out Blue);
ConvertTo8BitChannel(image.GetComponent(3), out Alpha);
break;
}
}
/// <summary>
/// Constructs ManagedImage class from <see cref="SKBitmap"/>
/// </summary>