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Read ICC profile from v5 header

pull/2108/head
Brian Popow 4 years ago
parent
fa86a04464
commit
6991fd13bd
1 changed files with 25 additions and 16 deletions
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  1. 41
      src/ImageSharp/Formats/Bmp/BmpDecoderCore.cs

41
src/ImageSharp/Formats/Bmp/BmpDecoderCore.cs
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@ -11,6 +11,7 @@ using SixLabors.ImageSharp.Common.Helpers;
using SixLabors.ImageSharp.IO;
using SixLabors.ImageSharp.Memory;
using SixLabors.ImageSharp.Metadata;
using SixLabors.ImageSharp.Metadata.Profiles.Icc;
using SixLabors.ImageSharp.PixelFormats;
namespace SixLabors.ImageSharp.Formats.Bmp
@ -185,7 +186,7 @@ namespace SixLabors.ImageSharp.Formats.Bmp
break;
default:
BmpThrowHelper.ThrowNotSupportedException("Does not support this kind of bitmap files.");
BmpThrowHelper.ThrowNotSupportedException("ImageSharp does not support this kind of bitmap files.");
break;
}
@ -1199,6 +1200,13 @@ namespace SixLabors.ImageSharp.Formats.Bmp
private void ReadInfoHeader()
{
Span<byte> buffer = stackalloc byte[BmpInfoHeader.MaxHeaderSize];
var infoHeaderStart = this.stream.Position;
// Resolution is stored in PPM.
this.metadata = new ImageMetadata
{
ResolutionUnits = PixelResolutionUnit.PixelsPerMeter
};
// Read the header size.
this.stream.Read(buffer, 0, BmpInfoHeader.HeaderSizeSize);
@ -1282,31 +1290,34 @@ namespace SixLabors.ImageSharp.Formats.Bmp
// > 108 bytes
infoHeaderType = BmpInfoHeaderType.WinVersion5;
this.infoHeader = BmpInfoHeader.ParseV5(buffer);
if (this.infoHeader.ProfileData != 0 && this.infoHeader.ProfileSize != 0)
{
// Read color profile.
long streamPosition = this.stream.Position;
byte[] iccProfileData = new byte[this.infoHeader.ProfileSize];
this.stream.Position = infoHeaderStart + this.infoHeader.ProfileData;
this.stream.Read(iccProfileData);
this.metadata.IccProfile = new IccProfile(iccProfileData);
this.stream.Position = streamPosition;
}
}
else
{
BmpThrowHelper.ThrowNotSupportedException($"ImageSharp does not support this BMP file. HeaderSize '{headerSize}'.");
}
// Resolution is stored in PPM.
var meta = new ImageMetadata
{
ResolutionUnits = PixelResolutionUnit.PixelsPerMeter
};
if (this.infoHeader.XPelsPerMeter > 0 && this.infoHeader.YPelsPerMeter > 0)
{
meta.HorizontalResolution = this.infoHeader.XPelsPerMeter;
meta.VerticalResolution = this.infoHeader.YPelsPerMeter;
this.metadata.HorizontalResolution = this.infoHeader.XPelsPerMeter;
this.metadata.VerticalResolution = this.infoHeader.YPelsPerMeter;
}
else
{
// Convert default metadata values to PPM.
meta.HorizontalResolution = Math.Round(UnitConverter.InchToMeter(ImageMetadata.DefaultHorizontalResolution));
meta.VerticalResolution = Math.Round(UnitConverter.InchToMeter(ImageMetadata.DefaultVerticalResolution));
this.metadata.HorizontalResolution = Math.Round(UnitConverter.InchToMeter(ImageMetadata.DefaultHorizontalResolution));
this.metadata.VerticalResolution = Math.Round(UnitConverter.InchToMeter(ImageMetadata.DefaultVerticalResolution));
}
this.metadata = meta;
short bitsPerPixel = this.infoHeader.BitsPerPixel;
this.bmpMetadata = this.metadata.GetBmpMetadata();
this.bmpMetadata.InfoHeaderType = infoHeaderType;
@ -1376,9 +1387,7 @@ namespace SixLabors.ImageSharp.Formats.Bmp
int colorMapSizeBytes = -1;
if (this.infoHeader.ClrUsed == 0)
{
if (this.infoHeader.BitsPerPixel == 1
|| this.infoHeader.BitsPerPixel == 4
|| this.infoHeader.BitsPerPixel == 8)
if (this.infoHeader.BitsPerPixel is 1 or 4 or 8)
{
switch (this.fileMarkerType)
{
@ -1430,7 +1439,7 @@ namespace SixLabors.ImageSharp.Formats.Bmp
int skipAmount = this.fileHeader.Offset - (int)this.stream.Position;
if ((skipAmount + (int)this.stream.Position) > this.stream.Length)
{
BmpThrowHelper.ThrowInvalidImageContentException("Invalid fileheader offset found. Offset is greater than the stream length.");
BmpThrowHelper.ThrowInvalidImageContentException("Invalid file header offset found. Offset is greater than the stream length.");
}
if (skipAmount > 0)

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