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Implement native ADV Hide Window path

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gamer147
2026-07-18 21:14:06 -04:00
parent 6255f42794
commit d8ead3da6e
18 changed files with 578 additions and 35 deletions
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80
engine/Age.Engine/Sys4/CurDecoder.cs Normal file
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using System.Buffers.Binary;
namespace Age.Engine.Sys4;
/// <summary>A decoded Windows cursor image and its native hotspot.</summary>
public sealed record CursorImage(RgbaImage Image, int HotspotX, int HotspotY);
/// <summary>Decoder for Himegari's monochrome Windows .CUR resources.</summary>
public static class CurDecoder
{
public static CursorImage Decode(ReadOnlySpan<byte> file, string name = "CUR")
{
if (file.Length < 22 || U16(file, 0) != 0 || U16(file, 2) != 2 || U16(file, 4) < 1)
throw new InvalidDataException($"{name}: expected a Windows cursor directory");
int width = file[6] == 0 ? 256 : file[6];
int height = file[7] == 0 ? 256 : file[7];
int hotspotX = U16(file, 10);
int hotspotY = U16(file, 12);
int imageSize = I32(file, 14);
int imageOffset = I32(file, 18);
if (imageSize <= 0 || imageOffset < 22 || imageOffset > file.Length - imageSize)
throw new InvalidDataException($"{name}: cursor image range is invalid");
int headerSize = I32(file, imageOffset);
if (headerSize < 40 || imageOffset > file.Length - headerSize)
throw new InvalidDataException($"{name}: unsupported bitmap header");
int dibWidth = I32(file, imageOffset + 4);
int dibHeight = I32(file, imageOffset + 8);
int planes = U16(file, imageOffset + 12);
int bitsPerPixel = U16(file, imageOffset + 14);
int compression = I32(file, imageOffset + 16);
if (dibWidth != width || System.Math.Abs(dibHeight) != height * 2 || planes != 1
|| bitsPerPixel != 1 || compression != 0)
throw new InvalidDataException($"{name}: expected an uncompressed 1-bit {width}x{height} cursor");
int paletteOffset = checked(imageOffset + headerSize);
if (paletteOffset > file.Length - 8) throw new InvalidDataException($"{name}: palette is truncated");
int xorStride = checked(((width + 31) / 32) * 4);
int maskBytes = checked(xorStride * height);
int xorOffset = checked(paletteOffset + 8);
int andOffset = checked(xorOffset + maskBytes);
if (andOffset > file.Length - maskBytes) throw new InvalidDataException($"{name}: cursor masks are truncated");
var rgba = new byte[checked(width * height * 4)];
bool bottomUp = dibHeight > 0;
for (int y = 0; y < height; y++)
{
int sourceY = bottomUp ? height - 1 - y : y;
int xorRow = xorOffset + sourceY * xorStride;
int andRow = andOffset + sourceY * xorStride;
for (int x = 0; x < width; x++)
{
int shift = 7 - (x & 7);
int paletteIndex = (file[xorRow + (x >> 3)] >> shift) & 1;
bool transparent = ((file[andRow + (x >> 3)] >> shift) & 1) != 0 && paletteIndex == 0;
int palette = paletteOffset + paletteIndex * 4;
int dst = (y * width + x) * 4;
rgba[dst] = file[palette + 2];
rgba[dst + 1] = file[palette + 1];
rgba[dst + 2] = file[palette];
rgba[dst + 3] = transparent ? (byte)0 : (byte)255;
}
}
return new CursorImage(new RgbaImage(width, height, rgba), hotspotX, hotspotY);
}
private static int U16(ReadOnlySpan<byte> data, int offset)
{
if ((uint)offset > (uint)(data.Length - 2)) throw new InvalidDataException("CUR: truncated field");
return BinaryPrimitives.ReadUInt16LittleEndian(data[offset..]);
}
private static int I32(ReadOnlySpan<byte> data, int offset)
{
if ((uint)offset > (uint)(data.Length - 4)) throw new InvalidDataException("CUR: truncated field");
return BinaryPrimitives.ReadInt32LittleEndian(data[offset..]);
}
}