public static void doit(String orig)
{
string copy = TestsHelper.addSuffixToName(orig, "_tc");
PngReader pngr = FileHelper.CreatePngReader(orig);
if (!pngr.ImgInfo.Indexed)
{
throw new Exception("Not indexed image");
}
PngChunkPLTE plte = pngr.GetMetadata().GetPLTE();
PngChunkTRNS trns = pngr.GetMetadata().GetTRNS(); // transparency metadata, can be null
bool alpha = trns != null;
ImageInfo im2 = new ImageInfo(pngr.ImgInfo.Cols, pngr.ImgInfo.Rows, 8, alpha);
PngWriter pngw = FileHelper.CreatePngWriter(copy, im2, true);
pngw.CopyChunksFirst(pngr, ChunkCopyBehaviour.COPY_ALL_SAFE);
int[] buf = null;
for (int row = 0; row < pngr.ImgInfo.Rows; row++)
{
ImageLine line = pngr.ReadRowInt(row);
buf = ImageLineHelper.Palette2rgb(line, plte, trns, buf);
pngw.WriteRowInt(buf, row);
}
pngw.CopyChunksLast(pngr, ChunkCopyBehaviour.COPY_ALL_SAFE);
pngr.End();
pngw.End();
Console.WriteLine("True color: " + copy);
}
private static void additionalTestPalette(string orig, string truecolor)
{
// covnert to true color 8 bits and check equality
PngReader pngr = FileHelper.CreatePngReader(orig);
PngChunkPLTE plte = pngr.GetMetadata().GetPLTE();
PngChunkTRNS trns = pngr.GetMetadata().GetTRNS();
string copy = TestsHelper.addSuffixToName(orig, "_tccopy");
bool alpha = trns != null;
ImageInfo im2 = new ImageInfo(pngr.ImgInfo.Cols, pngr.ImgInfo.Rows, 8, alpha);
PngWriter pngw = FileHelper.CreatePngWriter(copy, im2, true);
pngw.CopyChunksFirst(pngr, ChunkCopyBehaviour.COPY_ALL_SAFE);
int[] buf = null;
for (int row = 0; row < pngr.ImgInfo.Rows; row++)
{
ImageLine line = pngr.ReadRowInt(row);
buf = ImageLineHelper.Palette2rgb(line, plte, trns, buf);
pngw.WriteRowInt(buf, row);
}
pngr.End();
pngw.End();
TestsHelper.testEqual(copy, truecolor);
System.IO.File.Delete(copy);
}
public IEnumerable <RGBA> EnRGBA()
{
PngChunkPLTE oplte = null;
PngChunkTRNS otrns = null; // transparency metadata, can be null
if (pngr.ImgInfo.Indexed)
{
oplte = pngr.GetMetadata().GetPLTE();
otrns = pngr.GetMetadata().GetTRNS();
}
for (var row = 0; row < pngr.ImgInfo.Rows; row++)
{
var line = pngr.ReadRowInt(row);
if (pngr.ImgInfo.Indexed)
{
var rgrgba = ImageLineHelper.Palette2rgb(line, oplte, otrns, null);
for (var irgba = 0; irgba < rgrgba.Length;)
{
yield return(new RGBA
{
r = rgrgba[irgba++],
g = rgrgba[irgba++],
b = rgrgba[irgba++],
a = (otrns != null ? rgrgba[irgba++] : 255),
});
}
}
else
{
if (pngr.ImgInfo.Packed)
{
line = line.unpackToNewImageLine();
}
for (var col = 0; col < pngr.ImgInfo.Cols; col++)
{
switch (pngr.ImgInfo.Channels)
{
case 1:
yield return(new RGBA
{
r = Read8(col, line),
g = Read8(col, line),
b = Read8(col, line),
});
break;
case 2:
yield return(new RGBA
{
r = Read8(col * 2, line),
g = Read8(col * 2, line),
b = Read8(col * 2, line),
a = Read8(col * 2 + 1, line),
});
break;
case 3:
yield return(new RGBA
{
r = Read8(col * 3, line),
g = Read8(col * 3 + 1, line),
b = Read8(col * 3 + 2, line),
});
break;
case 4:
yield return(new RGBA
{
r = Read8(col * 4, line),
g = Read8(col * 4 + 1, line),
b = Read8(col * 4 + 2, line),
a = Read8(col * 4 + 3, line),
});
break;
}
}
}
}
}
