private static void ReadBitmap32(ByteReader reader, ParseContext context, int height, int width, IcoFrame source)
{
for (var y = height - 1; y >= 0; y--)
{
for (var x = 0; x < width; x++)
{
var colorValue = new Bgra32 {
PackedValue = reader.NextUint32()
};
source.CookedData[x, y] = colorValue.ToRgba32();
}
}
source.Encoding.PixelFormat = BmpUtil.IsAnyAlphaChannel(source.CookedData)
? BitmapEncoding.Pixel_argb32
: BitmapEncoding.Pixel_0rgb32;
ReadBitmapMask(reader, context, height, width, source);
}
private static IcoFrame ProcessIcoFrame(ByteReader reader, ParseContext context)
{
var bWidth = reader.NextUint8();
var bHeight = reader.NextUint8();
var bColorCount = reader.NextUint8();
var bReserved = reader.NextUint8();
var wPlanes = reader.NextUint16();
var wBitCount = reader.NextUint16();
var dwBytesInRes = reader.NextUint32();
var dwImageOffset = reader.NextUint32();
if (bWidth != bHeight)
{
context.Reporter.WarnLine(IcoErrorCode.NotSquare, $"Icon is not square ({bWidth}x{bHeight}).", context.DisplayedPath, context.ImageDirectoryIndex.Value);
}
if (bReserved != FileFormatConstants._iconEntryReserved)
{
throw new InvalidIcoFileException(IcoErrorCode.InvalidFrameHeader_bReserved, $"ICONDIRECTORY.bReserved should be {FileFormatConstants._iconEntryReserved}, was {bReserved}.", context);
}
if (wPlanes > 1)
{
throw new InvalidIcoFileException(IcoErrorCode.InvalidFrameHeader_wPlanes, $"ICONDIRECTORY.wPlanes is {wPlanes}. Only single-plane bitmaps are supported.", context);
}
if (dwBytesInRes > int.MaxValue)
{
throw new InvalidIcoFileException(IcoErrorCode.InvalidFrameHeader_dwBytesInRes, $"ICONDIRECTORY.dwBytesInRes == {dwBytesInRes}, which is unreasonably large.", context);
}
if (dwImageOffset > int.MaxValue)
{
throw new InvalidIcoFileException(IcoErrorCode.InvalidFrameHeader_dwImageOffset, $"ICONDIRECTORY.dwImageOffset == {dwImageOffset}, which is unreasonably large.", context);
}
var source = new IcoFrame
{
TotalDiskUsage = dwBytesInRes + /* sizeof(ICONDIRENTRY) */ 16,
Encoding = new IcoFrameEncoding
{
ClaimedBitDepth = wBitCount,
ClaimedHeight = bHeight > 0 ? bHeight : 256u,
ClaimedWidth = bWidth > 0 ? bWidth : 256u,
},
};
source.RawData = reader.Data.Slice((int)dwImageOffset, (int)dwBytesInRes).ToArray();
var bitmapHeader = new ByteReader(source.RawData, ByteOrder.LittleEndian);
var signature = bitmapHeader.NextUint64();
bitmapHeader.SeekOffset = 0;
if (PngDecoder.IsProbablyPngFile(ByteOrderConverter.To(ByteOrder.NetworkEndian, signature)))
{
PngDecoder.DoPngEntry(bitmapHeader, context, source);
}
else
{
BmpDecoder.DoBitmapEntry(bitmapHeader, context, source);
}
return(source);
}
public static PngFileEncoding GetPngFileEncoding(Memory <byte> data)
{
var reader = new ByteReader(data, ByteOrder.NetworkEndian);
if (FileFormatConstants._pngHeader != reader.NextUint64())
{
throw new InvalidPngFileException(IcoErrorCode.NotPng, $"Data stream does not begin with the PNG magic constant");
}
var chunkLength = reader.NextUint32();
var chunkType = reader.NextUint32();
if (chunkType != _ihdrChunkName)
{
throw new InvalidPngFileException(IcoErrorCode.PngBadIHDR, $"PNG file should begin with IHDR chunk; found {chunkType} instead");
}
if (chunkLength < 13)
{
throw new InvalidPngFileException(IcoErrorCode.PngBadIHDR, $"IHDR chunk is invalid length {chunkLength}; expected at least 13 bytes");
}
var result = new PngFileEncoding
{
Width = reader.NextUint32(),
Height = reader.NextUint32(),
BitsPerChannel = reader.NextUint8(),
ColorType = (PngColorType)reader.NextUint8(),
};
if (result.Width == 0 || result.Height == 0)
{
throw new InvalidPngFileException(IcoErrorCode.PngIllegalInputDimensions, $"Illegal Width x Height of {result.Width} x {result.Height}");
}
switch (result.BitsPerChannel)
{
case 1:
case 2:
case 4:
case 8:
case 16:
break;
default:
throw new InvalidPngFileException(IcoErrorCode.PngIllegalInputDepth, $"Illegal bits per color channel / palette entry of {result.BitsPerChannel}");
}
switch (result.ColorType)
{
case PngColorType.Grayscale:
case PngColorType.RGB:
case PngColorType.Palette:
case PngColorType.GrayscaleAlpha:
case PngColorType.RGBA:
break;
default:
throw new InvalidPngFileException(IcoErrorCode.PngIllegalColorType, $"Illegal color type {result.ColorType}");
}
return(result);
}
private static void ReadIndexedBitmap(ByteReader reader, ParseContext context, uint bitDepth, uint colorTableSize, int height, int width, IcoFrame source)
{
var anyReservedChannel = false;
var anyIndexOutOfBounds = false;
if (colorTableSize == 0)
{
colorTableSize = 1u << (int)bitDepth;
}
source.Encoding.PaletteSize = colorTableSize;
if (colorTableSize > 1u << (int)bitDepth)
{
throw new InvalidIcoFileException(IcoErrorCode.InvalidBitapInfoHeader_biClrUsed, $"BITMAPINFOHEADER.biClrUsed is greater than 2^biBitCount (biClrUsed == {colorTableSize}, biBitCount = {bitDepth}).", context);
}
else if (colorTableSize < 1u << (int)bitDepth)
{
context.Reporter.WarnLine(IcoErrorCode.UndersizedColorTable, $"This bitmap uses a color table that is smaller than the bit depth ({colorTableSize} < 2^{bitDepth})", context.DisplayedPath, context.ImageDirectoryIndex.Value);
}
var colorTable = new Rgba32[colorTableSize];
for (var i = 0; i < colorTableSize; i++)
{
var c = new Bgra32
{
PackedValue = reader.NextUint32()
};
if (c.A != 0)
{
anyReservedChannel = true;
}
c.A = 255;
colorTable[i] = c.ToRgba32();
}
var padding = reader.SeekOffset % 4;
for (var y = height - 1; y >= 0; y--)
{
var bits = new BitReader(reader);
for (var x = 0; x < width; x++)
{
var colorIndex = bits.NextBit(bitDepth);
if (colorIndex >= colorTableSize)
{
anyIndexOutOfBounds = true;
source.CookedData[x, y] = Rgba32.Black;
}
else
{
source.CookedData[x, y] = colorTable[colorIndex];
}
}
while ((reader.SeekOffset % 4) != padding)
{
reader.SeekOffset += 1;
}
}
switch (bitDepth)
{
case 1:
source.Encoding.PixelFormat = BitmapEncoding.Pixel_indexed1;
break;
case 2:
source.Encoding.PixelFormat = BitmapEncoding.Pixel_indexed2;
break;
case 4:
source.Encoding.PixelFormat = BitmapEncoding.Pixel_indexed4;
break;
case 8:
source.Encoding.PixelFormat = BitmapEncoding.Pixel_indexed8;
break;
}
ReadBitmapMask(reader, context, height, width, source);
if (anyReservedChannel)
{
context.Reporter.WarnLine(IcoErrorCode.NonzeroAlpha, $"Reserved Alpha channel used in color table.", context.DisplayedPath, context.ImageDirectoryIndex.Value);
}
if (anyIndexOutOfBounds)
{
context.Reporter.WarnLine(IcoErrorCode.IndexedColorOutOfBounds, $"Bitmap uses color at illegal index; pixel filled with Black color.", context.DisplayedPath, context.ImageDirectoryIndex.Value);
}
}
public static void DoBitmapEntry(ByteReader reader, ParseContext context, IcoFrame source)
{
var biSize = reader.NextUint32();
var biWidth = reader.NextInt32();
var biHeight = reader.NextInt32();
var biPlanes = reader.NextUint16();
var biBitCount = reader.NextUint16();
var biCompression = reader.NextUint32();
var biSizeImage = reader.NextUint32();
var biXPelsPerMeter = reader.NextInt32();
var biYPelsPerMeter = reader.NextInt32();
var biClrUsed = reader.NextUint32();
var biClrImportant = reader.NextUint32();
if (biSize != FileFormatConstants._bitmapInfoHeaderSize)
{
throw new InvalidIcoFileException(IcoErrorCode.InvalidBitapInfoHeader_ciSize, $"BITMAPINFOHEADER.ciSize should be {FileFormatConstants._bitmapInfoHeaderSize}, was {biSize}.", context);
}
if (biXPelsPerMeter != 0)
{
context.Reporter.WarnLine(IcoErrorCode.InvalidBitapInfoHeader_biXPelsPerMeter, $"BITMAPINFOHEADER.biXPelsPerMeter should be 0, was {biXPelsPerMeter}.", context.DisplayedPath, context.ImageDirectoryIndex.Value);
}
if (biYPelsPerMeter != 0)
{
context.Reporter.WarnLine(IcoErrorCode.InvalidBitapInfoHeader_biYPelsPerMeter, $"BITMAPINFOHEADER.biYPelsPerMeter should be 0, was {biYPelsPerMeter}.", context.DisplayedPath, context.ImageDirectoryIndex.Value);
}
if (biCompression == FileFormatConstants.BI_BITFIELDS)
{
throw new InvalidIcoFileException(IcoErrorCode.BitfieldCompressionNotSupported, $"This tool does not implement icon bitmaps that use BI_BITFIELDS compression. (The .ICO file may be okay, although it is certainly unusual.)", context);
}
if (biCompression != FileFormatConstants.BI_RGB)
{
throw new InvalidIcoFileException(IcoErrorCode.BitmapCompressionNotSupported, $"BITMAPINFOHEADER.biCompression is unknown value ({biCompression}).", context);
}
if (biHeight != source.Encoding.ClaimedHeight * 2)
{
context.Reporter.WarnLine(IcoErrorCode.MismatchedHeight, $"BITMAPINFOHEADER.biHeight is not exactly double ICONDIRECTORY.bHeight ({biHeight} != 2 * {source.Encoding.ClaimedHeight}).", context.DisplayedPath, context.ImageDirectoryIndex.Value);
}
if (biWidth != source.Encoding.ClaimedWidth)
{
context.Reporter.WarnLine(IcoErrorCode.MismatchedWidth, $"BITMAPINFOHEADER.biWidth is not exactly equal to ICONDIRECTORY.bWidth ({biWidth} != 2 * {source.Encoding.ClaimedWidth}).", context.DisplayedPath, context.ImageDirectoryIndex.Value);
}
var height = biHeight / 2;
var width = biWidth;
source.Encoding.ActualHeight = (uint)height;
source.Encoding.ActualWidth = (uint)width;
source.Encoding.ActualBitDepth = biBitCount;
source.Encoding.Type = IcoEncodingType.Bitmap;
source.CookedData = new Image <Rgba32>(width, height);
switch (biBitCount)
{
case 1:
case 2:
case 4:
case 8:
ReadIndexedBitmap(reader, context, biBitCount, biClrUsed, height, width, source);
break;
case 16:
ReadBitmap16(reader, context, height, width, source);
break;
case 24:
ReadBitmap24(reader, context, biClrUsed, height, width, source);
break;
case 32:
ReadBitmap32(reader, context, height, width, source);
break;
default:
throw new InvalidIcoFileException(IcoErrorCode.InvalidBitapInfoHeader_biBitCount, $"BITMAPINFOHEADER.biBitCount is unknown value ({biBitCount}); expected 1, 4, 8, 16, or 32 bit depth.", context);
}
}