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feature: supports to view .tiff images

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Signed-off-by: leo <longshuang@msn.cn>
This commit is contained in:
leo
2025-06-12 18:15:25 +08:00
parent cb6d6a233f
commit 05757ebf40
3 changed files with 90 additions and 64 deletions
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150
src/ViewModels/ImageSource.cs
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@@ -7,6 +7,7 @@ using Avalonia;
using Avalonia.Media.Imaging;
using Avalonia.Platform;
using BitMiracle.LibTiff.Classic;
using Pfim;
namespace SourceGit.ViewModels
@@ -39,6 +40,9 @@ namespace SourceGit.ViewModels
case ".tga":
case ".dds":
return Models.ImageDecoder.Pfim;
case ".tif":
case ".tiff":
return Models.ImageDecoder.Tiff;
default:
return Models.ImageDecoder.None;
}
@@ -70,10 +74,22 @@ namespace SourceGit.ViewModels
var size = stream.Length;
if (size > 0)
{
if (decoder == Models.ImageDecoder.Builtin)
return DecodeWithAvalonia(stream, size);
else if (decoder == Models.ImageDecoder.Pfim)
return DecodeWithPfim(stream, size);
try
{
switch (decoder)
{
case Models.ImageDecoder.Builtin:
return DecodeWithAvalonia(stream, size);
case Models.ImageDecoder.Pfim:
return DecodeWithPfim(stream, size);
case Models.ImageDecoder.Tiff:
return DecodeWithTiff(stream, size);
}
}
catch (Exception e)
{
Console.Out.WriteLine(e.Message);
}
}
return new ImageSource(null, 0);
@@ -81,75 +97,83 @@ namespace SourceGit.ViewModels
private static ImageSource DecodeWithAvalonia(Stream stream, long size)
{
try
{
var bitmap = new Bitmap(stream);
return new ImageSource(bitmap, size);
}
catch
{
return new ImageSource(null, 0);
}
var bitmap = new Bitmap(stream);
return new ImageSource(bitmap, size);
}
private static ImageSource DecodeWithPfim(Stream stream, long size)
{
try
using (var pfiImage = Pfimage.FromStream(stream))
{
using (var pfiImage = Pfimage.FromStream(stream))
var data = pfiImage.Data;
var stride = pfiImage.Stride;
var pixelFormat = PixelFormats.Bgra8888;
var alphaFormat = AlphaFormat.Opaque;
switch (pfiImage.Format)
{
var data = pfiImage.Data;
var stride = pfiImage.Stride;
case ImageFormat.Rgb8:
pixelFormat = PixelFormats.Gray8;
break;
case ImageFormat.R5g5b5:
case ImageFormat.R5g5b5a1:
pixelFormat = PixelFormats.Bgr555;
break;
case ImageFormat.R5g6b5:
pixelFormat = PixelFormats.Bgr565;
break;
case ImageFormat.Rgb24:
pixelFormat = PixelFormats.Bgr24;
break;
case ImageFormat.Rgba16:
var pixels2 = pfiImage.DataLen / 2;
data = new byte[pixels2 * 4];
stride = pfiImage.Width * 4;
for (var i = 0; i < pixels2; i++)
{
var src = BitConverter.ToUInt16(pfiImage.Data, i * 2);
data[i * 4 + 0] = (byte)Math.Round((src & 0x0F) / 15F * 255); // B
data[i * 4 + 1] = (byte)Math.Round(((src >> 4) & 0x0F) / 15F * 255); // G
data[i * 4 + 2] = (byte)Math.Round(((src >> 8) & 0x0F) / 15F * 255); // R
data[i * 4 + 3] = (byte)Math.Round(((src >> 12) & 0x0F) / 15F * 255); // A
}
var pixelFormat = PixelFormats.Bgra8888;
var alphaFormat = AlphaFormat.Opaque;
switch (pfiImage.Format)
{
case ImageFormat.Rgb8:
pixelFormat = PixelFormats.Gray8;
break;
case ImageFormat.R5g5b5:
case ImageFormat.R5g5b5a1:
pixelFormat = PixelFormats.Bgr555;
break;
case ImageFormat.R5g6b5:
pixelFormat = PixelFormats.Bgr565;
break;
case ImageFormat.Rgb24:
pixelFormat = PixelFormats.Bgr24;
break;
case ImageFormat.Rgba16:
var pixels2 = pfiImage.DataLen / 2;
data = new byte[pixels2 * 4];
stride = pfiImage.Width * 4;
for (var i = 0; i < pixels2; i++)
{
var src = BitConverter.ToUInt16(pfiImage.Data, i * 2);
data[i * 4 + 0] = (byte)Math.Round((src & 0x0F) / 15F * 255); // B
data[i * 4 + 1] = (byte)Math.Round(((src >> 4) & 0x0F) / 15F * 255); // G
data[i * 4 + 2] = (byte)Math.Round(((src >> 8) & 0x0F) / 15F * 255); // R
data[i * 4 + 3] = (byte)Math.Round(((src >> 12) & 0x0F) / 15F * 255); // A
}
alphaFormat = AlphaFormat.Premul;
break;
case ImageFormat.Rgba32:
alphaFormat = AlphaFormat.Premul;
break;
default:
return new ImageSource(null, 0);
}
var ptr = Marshal.UnsafeAddrOfPinnedArrayElement(data, 0);
var pixelSize = new PixelSize(pfiImage.Width, pfiImage.Height);
var dpi = new Vector(96, 96);
var bitmap = new Bitmap(pixelFormat, alphaFormat, ptr, pixelSize, dpi, stride);
return new ImageSource(bitmap, size);
alphaFormat = AlphaFormat.Premul;
break;
case ImageFormat.Rgba32:
alphaFormat = AlphaFormat.Premul;
break;
default:
return new ImageSource(null, 0);
}
var ptr = Marshal.UnsafeAddrOfPinnedArrayElement(data, 0);
var pixelSize = new PixelSize(pfiImage.Width, pfiImage.Height);
var dpi = new Vector(96, 96);
var bitmap = new Bitmap(pixelFormat, alphaFormat, ptr, pixelSize, dpi, stride);
return new ImageSource(bitmap, size);
}
catch
}
private static ImageSource DecodeWithTiff(Stream stream, long size)
{
using (var tiff = Tiff.ClientOpen($"{Guid.NewGuid()}.tif", "r", stream, new TiffStream()))
{
return new ImageSource(null, 0);
if (tiff == null)
return new ImageSource(null, 0);
var width = tiff.GetField(TiffTag.IMAGEWIDTH)[0].ToInt();
var height = tiff.GetField(TiffTag.IMAGELENGTH)[0].ToInt();
var pixels = new int[width * height];
// Currently only supports image when its `BITSPERSAMPLE` is one in [1,2,4,8,16]
tiff.ReadRGBAImageOriented(width, height, pixels, Orientation.TOPLEFT);
var ptr = Marshal.UnsafeAddrOfPinnedArrayElement(pixels, 0);
var pixelSize = new PixelSize(width, height);
var dpi = new Vector(96, 96);
var bitmap = new Bitmap(PixelFormats.Rgba8888, AlphaFormat.Premul, ptr, pixelSize, dpi, width * 4);
return new ImageSource(bitmap, size);
}
}
}