MrUnknownDE/VRCX
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This commit is contained in:
Natsumi
2023-02-27 21:02:55 +13:00
parent a27f3f390e
commit 8b59e0fab1
5 changed files with 106 additions and 16 deletions
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21
ScreenshotHelper.cs
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@@ -66,6 +66,19 @@ namespace VRCX
return text;
}
public static string ReadPNGResolution(string path)
{
if (!File.Exists(path) || !IsPNGFile(path)) return null;
var png = File.ReadAllBytes(path);
var existingpHYs = FindChunk(png, "IHDR");
if (existingpHYs == null) return null;
var text = existingpHYs.GetResolution();
return text;
}
/// <summary>
/// Determines whether the specified file is a PNG file. We do this by checking if the first 8 bytes in the file path match the PNG signature.
/// </summary>
@@ -358,10 +371,16 @@ namespace VRCX
public string GetText(string keyword)
{
var offset = keywordEncoding.GetByteCount(keyword) + 5;
// Read string from PNG chunk
return Encoding.UTF8.GetString(ChunkDataBytes.ToArray(), offset, ChunkDataBytes.Count - offset);
}
public string GetResolution()
{
var x = BitConverter.ToInt32(ChunkDataBytes.Take(4).Reverse().ToArray(), 0);
var y = BitConverter.ToInt32(ChunkDataBytes.Skip(4).Take(4).Reverse().ToArray(), 0);
return $"{x}x{y}";
}
// Crc32 implementation from
// https://web.archive.org/web/20150825201508/http://upokecenter.dreamhosters.com/articles/png-image-encoder-in-c/
private static uint Crc32(byte[] stream, int offset, int length, uint crc)