public void CopyChunksFirst(PngReader reader, int copy_mask) => CopyChunks(reader, copy_mask, false);
public void CopyChunksLast(PngReader reader, int copy_mask) => CopyChunks(reader, copy_mask, true);
/// <summary>
/// copy chunks from reader - copy_mask : see ChunksToWrite.COPY_XXX
/// If we are after idat, only considers those chunks after IDAT in PngReader
/// TODO: this should be more customizable
/// </summary>
void CopyChunks(PngReader reader, int copy_mask, bool onlyAfterIdat)
{
bool idatDone = CurrentChunkGroup >= ChunksList.CHUNK_GROUP_4_IDAT;
if (onlyAfterIdat && reader.CurrentChunkGroup < ChunksList.CHUNK_GROUP_6_END)
{
throw new System.Exception("tried to copy last chunks but reader has not ended");
}
foreach (PngChunk chunk in reader.GetChunksList().GetChunks())
{
int group = chunk.ChunkGroup;
if (
group < ChunksList.CHUNK_GROUP_4_IDAT &&
idatDone
)
{
continue;
}
bool copy = false;
if (chunk.Crit)
{
if (chunk.Id.Equals(ChunkHelper.PLTE))
{
if (ImgInfo.Indexed && ChunkHelper.MaskMatch(copy_mask, ChunkCopyBehaviour.COPY_PALETTE))
{
copy = true;
}
if (!ImgInfo.Greyscale && ChunkHelper.MaskMatch(copy_mask, ChunkCopyBehaviour.COPY_ALL))
{
copy = true;
}
}
}
else // ancillary
{
bool text = (chunk is PngChunkTextVar);
bool safe = chunk.Safe;
// notice that these if are not exclusive
if (ChunkHelper.MaskMatch(copy_mask, ChunkCopyBehaviour.COPY_ALL))
{
copy = true;
}
if (safe && ChunkHelper.MaskMatch(copy_mask, ChunkCopyBehaviour.COPY_ALL_SAFE))
{
copy = true;
}
if (chunk.Id.Equals(ChunkHelper.tRNS) && ChunkHelper.MaskMatch(copy_mask, ChunkCopyBehaviour.COPY_TRANSPARENCY))
{
copy = true;
}
if (chunk.Id.Equals(ChunkHelper.pHYs) && ChunkHelper.MaskMatch(copy_mask, ChunkCopyBehaviour.COPY_PHYS))
{
copy = true;
}
if (text && ChunkHelper.MaskMatch(copy_mask, ChunkCopyBehaviour.COPY_TEXTUAL))
{
copy = true;
}
if (
ChunkHelper.MaskMatch(copy_mask, ChunkCopyBehaviour.COPY_ALMOSTALL) &&
!(ChunkHelper.IsUnknown(chunk) || text || chunk.Id.Equals(ChunkHelper.hIST) || chunk.Id.Equals(ChunkHelper.tIME))
)
{
copy = true;
}
if (chunk is PngChunkSkipped)
{
copy = false;
}
}
if (copy)
{
chunksList.Queue(PngChunk.CloneChunk(chunk, ImgInfo));
}
}
}
public static long GetCrctestVal(PngReader reader) => reader.GetCrctestVal();
public static void InitCrcForTests(PngReader reader) => reader.InitCrctest();
public static long GetCrctestVal(PngReader pngr)
{
return(pngr.GetCrctestVal());
}
public static void InitCrcForTests(PngReader pngr)
{
pngr.InitCrctest();
}