public WicMetadataReader(WicTransform prev, bool basicOnly = false) : base(prev)
{
if (Context.PixelFormat.NumericRepresentation == PixelNumericRepresentation.Indexed)
{
var pal = AddRef(Wic.CreatePalette());
Frame.CopyPalette(pal);
Context.HasAlpha = pal.HasAlpha();
Context.IsGreyscale = pal.IsGrayscale();
}
else
{
Context.HasAlpha = Context.PixelFormat.AlphaRepresentation != PixelAlphaRepresentation.None;
Context.IsGreyscale = Context.PixelFormat.ColorRepresentation == PixelColorRepresentation.Grey;
}
#if NET46
if (Frame.TryGetMetadataQueryReader(out var metareader))
{
AddRef(metareader);
// Exif orientation
if (metareader.TryGetMetadataByName("System.Photo.Orientation", out var ovar))
{
ushort orientation = 1;
if (ovar.UnmanagedType == VarEnum.VT_UI2)
{
orientation = (ushort)ovar.Value;
}
var opt = WICBitmapTransformOptions.WICBitmapTransformRotate0;
if (orientation == 3 || orientation == 4)
{
opt = WICBitmapTransformOptions.WICBitmapTransformRotate180;
}
else if (orientation == 6 || orientation == 7)
{
opt = WICBitmapTransformOptions.WICBitmapTransformRotate90;
}
else if (orientation == 5 || orientation == 8)
{
opt = WICBitmapTransformOptions.WICBitmapTransformRotate270;
}
if (orientation == 2 || orientation == 4 || orientation == 5 || orientation == 7)
{
opt |= WICBitmapTransformOptions.WICBitmapTransformFlipHorizontal;
}
Context.TransformOptions = opt;
}
if (basicOnly)
{
return;
}
// other requested properties
var propdic = new Dictionary <string, PropVariant>();
foreach (string prop in Context.Settings.MetadataNames ?? Enumerable.Empty <string>())
{
if (metareader.TryGetMetadataByName(prop, out var pvar) && pvar.Value != null)
{
propdic[prop] = pvar;
}
}
Context.Metadata = propdic;
}
#endif
// ICC profiles
//http://ninedegreesbelow.com/photography/embedded-color-space-information.html
uint ccc = Frame.GetColorContextCount();
var profiles = new IWICColorContext[ccc];
var profile = default(IWICColorContext);
if (ccc > 0)
{
for (int i = 0; i < ccc; i++)
{
profiles[i] = AddRef(Wic.CreateColorContext());
}
Frame.GetColorContexts(ccc, profiles);
}
foreach (var cc in profiles)
{
var cct = cc.GetType();
if (cct == WICColorContextType.WICColorContextProfile)
{
uint ccs = cc.GetProfileBytes(0, null);
var ccb = ArrayPool <byte> .Shared.Rent((int)ccs);
cc.GetProfileBytes(ccs, ccb);
var cp = new ColorProfileInfo(new ArraySegment <byte>(ccb, 0, (int)ccs));
ArrayPool <byte> .Shared.Return(ccb);
// match only color profiles that match our intended use. if we have a standard sRGB profile, don't save it; we don't need to convert
if (cp.IsValid && ((cp.IsDisplayRgb && !cp.IsStandardSrgb) || (cp.IsCmyk && Context.PixelFormat.ColorRepresentation == PixelColorRepresentation.Cmyk) /* || (Context.IsGreyscale && cp.DataColorSpace == "GRAY") */))
{
profile = cc;
break;
}
}
else if (cct == WICColorContextType.WICColorContextExifColorSpace && cc.GetExifColorSpace() == ExifColorSpace.AdobeRGB)
{
profile = cc;
break;
}
}
Context.SourceColorContext = profile ?? (Context.PixelFormat.ColorRepresentation == PixelColorRepresentation.Cmyk ? cmykProfile.Value : null);
Context.DestColorContext = srgbProfile.Value;
}
public WicMetadataReader(WicTransform prev, bool basicOnly = false) : base(prev)
{
var pfi = AddRef(Wic.CreateComponentInfo(Context.PixelFormat)) as IWICPixelFormatInfo2;
if (pfi.GetNumericRepresentation() == WICPixelFormatNumericRepresentation.WICPixelFormatNumericRepresentationIndexed)
{
var pal = AddRef(Wic.CreatePalette());
Frame.CopyPalette(pal);
Context.HasAlpha = pal.HasAlpha();
Context.IsGreyscale = pal.IsGrayscale();
}
else
{
uint chans = pfi.GetChannelCount();
bool trans = pfi.SupportsTransparency();
Context.HasAlpha = trans;
Context.IsGreyscale = chans == 1u;
Context.IsCmyk = (chans == 4u && !trans) || (chans == 5u && trans);
}
var metareader = Frame.GetMetadataQueryReaderNoThrow();
if (metareader != null)
{
AddRef(metareader);
// Exif orientation
if (metareader.HasMetadataName("System.Photo.Orientation"))
{
ushort orientation = 1;
var ovar = new PropVariant();
metareader.GetMetadataByName("System.Photo.Orientation", ovar);
if (ovar.UnmanagedType == VarEnum.VT_UI2)
{
orientation = (ushort)ovar.Value;
}
var opt = WICBitmapTransformOptions.WICBitmapTransformRotate0;
if (orientation == 3 || orientation == 4)
{
opt = WICBitmapTransformOptions.WICBitmapTransformRotate180;
}
else if (orientation == 6 || orientation == 7)
{
opt = WICBitmapTransformOptions.WICBitmapTransformRotate90;
}
else if (orientation == 5 || orientation == 8)
{
opt = WICBitmapTransformOptions.WICBitmapTransformRotate270;
}
if (orientation == 2 || orientation == 4 || orientation == 5 || orientation == 7)
{
opt |= WICBitmapTransformOptions.WICBitmapTransformFlipHorizontal;
}
Context.TransformOptions = opt;
}
if (basicOnly)
{
return;
}
// other requested properties
var propdic = new Dictionary <string, PropVariant>();
foreach (string prop in Context.Settings.MetadataNames ?? Enumerable.Empty <string>())
{
if (metareader.HasMetadataName(prop))
{
var pvar = new PropVariant();
metareader.GetMetadataByName(prop, pvar);
if (pvar.Value != null)
{
propdic[prop] = pvar;
}
}
}
Context.Metadata = propdic;
}
// ICC profiles
//http://ninedegreesbelow.com/photography/embedded-color-space-information.html
uint ccc = Frame.GetColorContextCount();
var profiles = new IWICColorContext[ccc];
var profile = (IWICColorContext)null;
if (ccc > 0)
{
for (int i = 0; i < ccc; i++)
{
profiles[i] = AddRef(Wic.CreateColorContext());
}
Frame.GetColorContexts(ccc, profiles);
}
foreach (var cc in profiles)
{
var cct = cc.GetType();
if (cct == WICColorContextType.WICColorContextProfile)
{
uint ccs = cc.GetProfileBytes(0, null);
var ccb = new byte[ccs];
cc.GetProfileBytes(ccs, ccb);
// match only color profiles that match our intended use. if we have a standard sRGB profile, don't save it; we don't need to convert
var cp = new ColorProfileInfo(ccb);
if (cp.IsValid && ((cp.IsDisplayRgb && !cp.IsStandardSrgb) || (Context.IsCmyk && cp.IsCmyk) /* || (Context.IsGreyscale && cp.DataColorSpace == "GRAY") */))
{
profile = cc;
break;
}
}
else if (cct == WICColorContextType.WICColorContextExifColorSpace && cc.GetExifColorSpace() == ExifColorSpace.AdobeRGB)
{
profile = cc;
break;
}
}
Context.SourceColorContext = profile ?? (Context.IsCmyk ? cmykProfile.Value : null);
Context.DestColorContext = srgbProfile.Value;
}