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(ImageFormat.ReadPalette): new static methods.

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Generalized image palette deserializations.
This commit is contained in:
morkt
2017-01-14 16:27:11 +04:00
parent 832a1a3ff0
commit 13cf289bae
25 changed files with 87 additions and 331 deletions
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49
GameRes/Image.cs
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@@ -46,6 +46,17 @@ namespace GameRes
public override string Type { get { return "image"; } }
}
/// <summary>
/// Enumeration representing possible palette serialization formats.
/// </summary>
public enum PaletteFormat
{
Rgb = 1,
Bgr = 2,
RgbX = 5,
BgrX = 6,
}
public class ImageData
{
private BitmapSource m_bitmap;
@@ -171,5 +182,43 @@ namespace GameRes
public static ImageFormat Png { get { return s_PngFormat.Value; } }
public static ImageFormat Bmp { get { return s_BmpFormat.Value; } }
public static ImageFormat Tga { get { return s_TgaFormat.Value; } }
/// <summary>
/// Desereialize color map from <paramref name="input"/> stream, consisting of specified number of
/// <paramref name="colors"/> stored in specified <paramref name="format"/>.
/// Default number of colors is 256 and format is 4-byte BGRX (where X is an unsignificant byte).
/// </summary>
public static Color[] ReadColorMap (Stream input, int colors = 0x100, PaletteFormat format = PaletteFormat.BgrX)
{
int bpp = PaletteFormat.Rgb == format || PaletteFormat.Bgr == format ? 3 : 4;
var palette_data = new byte[bpp * colors];
if (palette_data.Length != input.Read (palette_data, 0, palette_data.Length))
throw new EndOfStreamException();
int src = 0;
var color_map = new Color[colors];
Func<int, Color> get_color;
if (PaletteFormat.Bgr == format || PaletteFormat.BgrX == format)
get_color = x => Color.FromRgb (palette_data[x+2], palette_data[x+1], palette_data[x]);
else
get_color = x => Color.FromRgb (palette_data[x], palette_data[x+1], palette_data[x+2]);
for (int i = 0; i < colors; ++i)
{
color_map[i] = get_color (src);
src += bpp;
}
return color_map;
}
public static BitmapPalette ReadPalette (Stream input, int colors = 0x100, PaletteFormat format = PaletteFormat.BgrX)
{
return new BitmapPalette (ReadColorMap (input, colors, format));
}
public static BitmapPalette ReadPalette (ArcView file, long offset, int colors = 0x100, PaletteFormat format = PaletteFormat.BgrX)
{
using (var input = file.CreateStream (offset, (uint)(4 * colors))) // largest possible size for palette
return ReadPalette (input, colors, format);
}
}
}