public void GetBackgroundColorDescription()
{
PngDirectory directory = new PngDirectory(PngChunkType.bKGD);
PngDescriptor descriptor = new PngDescriptor(directory);
directory.Set(PngDirectory.TagBackgroundColor, new byte[] { 52 });
Assert.Equal("Palette Index 52", descriptor.GetBackgroundColorDescription());
Assert.Equal("Palette Index 52", directory.GetDescription(PngDirectory.TagBackgroundColor));
directory.Set(PngDirectory.TagBackgroundColor, new byte[] { 0, 52 });
Assert.Equal("Greyscale Level 52", descriptor.GetBackgroundColorDescription());
Assert.Equal("Greyscale Level 52", directory.GetDescription(PngDirectory.TagBackgroundColor));
directory.Set(PngDirectory.TagBackgroundColor, new byte[] { 0, 50, 0, 51, 0, 52 });
Assert.Equal("R 50, G 51, B 52", descriptor.GetBackgroundColorDescription());
Assert.Equal("R 50, G 51, B 52", directory.GetDescription(PngDirectory.TagBackgroundColor));
}
public void GetTextualDataDescription()
{
var latin1Encoding = Encoding.GetEncoding("iso-8859-1"); // Latin-1
var textPairs = new List <KeyValuePair>();
StringValue value = new StringValue(latin1Encoding.GetBytes("value"), latin1Encoding);
textPairs.Add(new KeyValuePair("keyword", value));
PngDirectory directory = new PngDirectory(PngChunkType.tEXt);
PngDescriptor descriptor = new PngDescriptor(directory);
directory.Set(PngDirectory.TagTextualData, textPairs);
Assert.Equal("keyword: value", descriptor.GetTextualDataDescription());
Assert.Equal("keyword: value", directory.GetDescription(PngDirectory.TagTextualData));
directory = new PngDirectory(PngChunkType.zTXt);
descriptor = new PngDescriptor(directory);
directory.Set(PngDirectory.TagTextualData, textPairs);
Assert.Equal("keyword: value", descriptor.GetTextualDataDescription());
Assert.Equal("keyword: value", directory.GetDescription(PngDirectory.TagTextualData));
directory = new PngDirectory(PngChunkType.iTXt);
descriptor = new PngDescriptor(directory);
directory.Set(PngDirectory.TagTextualData, textPairs);
Assert.Equal("keyword: value", descriptor.GetTextualDataDescription());
Assert.Equal("keyword: value", directory.GetDescription(PngDirectory.TagTextualData));
}
public void GetUnitSpecifierDescription()
{
PngDirectory directory = new PngDirectory(PngChunkType.pHYs);
PngDescriptor descriptor = new PngDescriptor(directory);
directory.Set(PngDirectory.TagUnitSpecifier, 1);
Assert.Equal("Metres", descriptor.GetUnitSpecifierDescription());
Assert.Equal("Metres", directory.GetDescription(PngDirectory.TagUnitSpecifier));
}
public void GetIsSrgbColorSpaceDescription()
{
PngDirectory directory = new PngDirectory(PngChunkType.sRGB);
PngDescriptor descriptor = new PngDescriptor(directory);
directory.Set(PngDirectory.TagSrgbRenderingIntent, 0);
Assert.Equal("Perceptual", descriptor.GetIsSrgbColorSpaceDescription());
Assert.Equal("Perceptual", directory.GetDescription(PngDirectory.TagSrgbRenderingIntent));
}
public void GetPaletteHasTransparencyDescription()
{
PngDirectory directory = new PngDirectory(PngChunkType.tRNS);
PngDescriptor descriptor = new PngDescriptor(directory);
directory.Set(PngDirectory.TagPaletteHasTransparency, 1);
Assert.Equal("Yes", descriptor.GetPaletteHasTransparencyDescription());
Assert.Equal("Yes", directory.GetDescription(PngDirectory.TagPaletteHasTransparency));
}
public void GetInterlaceMethodDescription()
{
PngDirectory directory = new PngDirectory(PngChunkType.IHDR);
PngDescriptor descriptor = new PngDescriptor(directory);
directory.Set(PngDirectory.TagInterlaceMethod, 1);
Assert.Equal("Adam7 Interlace", descriptor.GetInterlaceMethodDescription());
Assert.Equal("Adam7 Interlace", directory.GetDescription(PngDirectory.TagInterlaceMethod));
}
public void GetFilterMethodDescription()
{
PngDirectory directory = new PngDirectory(PngChunkType.IHDR);
PngDescriptor descriptor = new PngDescriptor(directory);
directory.Set(PngDirectory.TagFilterMethod, 0);
Assert.Equal("Adaptive", descriptor.GetFilterMethodDescription());
Assert.Equal("Adaptive", directory.GetDescription(PngDirectory.TagFilterMethod));
}
public void GetCompressionTypeDescription()
{
PngDirectory directory = new PngDirectory(PngChunkType.IHDR);
PngDescriptor descriptor = new PngDescriptor(directory);
directory.Set(PngDirectory.TagCompressionType, 0);
Assert.Equal("Deflate", descriptor.GetCompressionTypeDescription());
Assert.Equal("Deflate", directory.GetDescription(PngDirectory.TagCompressionType));
}
public void GetColorTypeDescription()
{
PngDirectory directory = new PngDirectory(PngChunkType.IHDR);
PngDescriptor descriptor = new PngDescriptor(directory);
directory.Set(PngDirectory.TagColorType, 6);
Assert.Equal("True Color with Alpha", descriptor.GetColorTypeDescription());
Assert.Equal("True Color with Alpha", directory.GetDescription(PngDirectory.TagColorType));
}
public static Metadata ParsePngDirectory(PngDirectory directory, Metadata metadata)
{
if (directory.TryGetInt32(PngDirectory.TagImageWidth, out var width))
{
metadata.Image.Width = width;
}
if (directory.TryGetInt32(PngDirectory.TagImageHeight, out var height))
{
metadata.Image.Height = height;
}
if (directory.TryGetInt32(PngDirectory.TagColorType, out var colorTypeId))
{
var colorType = PngColorType.FromNumericValue(colorTypeId);
metadata.Image.PngColorType = colorType.Description;
int?numberOfComponents = null;
if (colorType == PngColorType.Greyscale)
{
numberOfComponents = 1;
}
else if (colorType == PngColorType.TrueColor)
{
numberOfComponents = 3;
}
else if (colorType == PngColorType.GreyscaleWithAlpha)
{
numberOfComponents = 2;
}
else if (colorType == PngColorType.TrueColorWithAlpha)
{
numberOfComponents = 4;
}
int?dataPrecision = null;
if (directory.TryGetInt32(PngDirectory.TagBitsPerSample, out var bitsPerSample))
{
dataPrecision = bitsPerSample;
}
if (dataPrecision != null)
{
if (numberOfComponents != null)
{
metadata.Image.BitDepth = (int)(numberOfComponents * dataPrecision);
}
else
{
metadata.Image.DataPrecision = (int)dataPrecision;
}
}
}
if (directory.TryGetDouble(PngDirectory.TagGamma, out var gamma))
{
metadata.Image.Gamma = gamma;
}
if (directory.ContainsTag(PngDirectory.TagCompressionType))
{
metadata.Image.CompressionType = directory.GetDescription(PngDirectory.TagCompressionType);
}
if (directory.ContainsTag(PngDirectory.TagInterlaceMethod))
{
metadata.Image.InterlaceMethod = directory.GetDescription(PngDirectory.TagInterlaceMethod);
}
return(metadata);
}