// APNG
public static PNGWriter CreateIndexed8(int width, int height, int depth, byte[] colors, Color[] palette, Vector4[] materials)
{
var result = new PNGWriter {
stream = new MemoryStream(),
width = width,
height = height,
bitsPerPixel = 8,
ColorType = ColorType.Indexed,
};
result.writer = new BinaryWriter(result.stream);
var frameSize = width * height;
result.WriteSignature();
result.WriteIHDR();
if (palette != null)
{
result.WritePLTE(palette);
result.WritetRNS(palette);
//result.WritesPLT_RGBA(palette);
}
if (materials != null)
{
result.WritesPLT_MATL(materials);
}
result.WriteacTL((uint)depth);
uint sequence = 0;
var frameControl = new FrameControl {
width = (uint)width,
height = (uint)height,
delayNum = 1,
delayDen = 60,
};
frameControl.sequence = sequence++;
result.WritefcTL(frameControl);
if (depth > 0)
{
result.WriteIDAT(colors, 0, frameSize);
}
for (int f = 1; f < depth; f++)
{
frameControl.sequence = sequence++;
result.WritefcTL(frameControl);
result.WritefdAT(sequence++, colors, f * frameSize, frameSize);
}
result.WriteIEND();
return(result);
}
public static PNGWriter CreateA8FirstSlice(int width, int height, int depth, byte[] colors)
{
var result = new PNGWriter {
stream = new MemoryStream(),
width = width,
height = height,
bitsPerPixel = 8,
ColorType = ColorType.Alpha,
};
result.writer = new BinaryWriter(result.stream);
result.WriteSignature();
result.WriteIHDR();
result.WriteIDAT(colors, 0, colors.LongLength / depth);
result.WriteIEND();
return(result);
}