/// <summary>
/// P5ﾋﾞｯﾄﾏｯﾌﾟを原色に変換する
/// </summary>
/// <param name="buf"></param>
/// <param name="pnm"></param>
/// <returns></returns>
private Xi.ぉ[] ﾚﾍﾞﾙ5を読み込む(ref byte[] buf, PNM pnm)
{
pnm.現在位置 = 0;
var r = new Xi.ぉ[pnm.Width * pnm.Height];
int po = 0;
int bo = 0;
int ps = pnm.Maxval > 255 ? 2 : 1;
for (int y = 0; y < pnm.Height; ++y)
{
for (int x = 0; x < pnm.Width; ++x)
{
if (ps == 1)
{
var b = buf[bo];
r[po++] = new Xi.ぉ(b, b, b);
}
else
{
var b = buf[bo] | buf[bo + 1] << 8;
r[po++] = new Xi.ぉ(b, b, b);
}
bo += ps;
}
}
return(r);
}
/// <summary>
/// P4ﾋﾞｯﾄﾏｯﾌﾟを原色に変換する
/// </summary>
/// <param name="buf"></param>
/// <param name="pnm"></param>
/// <returns></returns>
private Xi.ぉ[] ﾚﾍﾞﾙ4を読み込む(ref byte[] buf, PNM pnm)
{
pnm.現在位置 = 0;
var r = new Xi.ぉ[pnm.Width * pnm.Height];
int po = 0;
int bo = 0;
var xpad = pnm.Width % 8;
for (int y = 0; y < pnm.Height; ++y)
{
for (int x = 0; x < pnm.Width; x += 8)
{
var b = buf[bo];
int bits = 8;
if ((pnm.Width - x < 8) && xpad != 0)
{
bits = xpad;
}
for (int i = 0; i < bits; ++i)
{
r[po++] = ぁゃιぃ(masken[i], b);
}
bo++;
}
}
return(r);
}
/// <summary>
/// 読み込む
/// </summary>
/// <param name="stream"></param>
/// <returns>PNM</returns>
public PNM Load(System.IO.Stream stream)
{
var pnm = new PNM();
var x = ReadLine(stream);
pnm.Format = 形式を割り出す(Encoding.ASCII.GetBytes(x));
if (pnm.Format == PNM.形式.P7)
{
ﾚﾍﾞﾙ7ﾍｯﾀﾞーを読み込む(stream, pnm);
}
else if (pnm.Format == PNM.形式.PF)
{
throw new Xi.それ対応してない($"むり {pnm.Format}");
}
else
{
pnm.Width = int.Parse(ReadNine(stream));
pnm.Height = int.Parse(ReadNine(stream));
if (pnm.Format != PNM.形式.P1 && pnm.Format != PNM.形式.P4)
{
pnm.Maxval = int.Parse(ReadNine(stream));
}
}
using (var ms = new System.IO.MemoryStream()) {
var rb = new byte[1024];
int siz = 0;
while ((siz = stream.Read(rb, 0, rb.Length - 1)) > 0)
{
ms.Write(rb, 0, siz);
}
if (pnm.Format == PNM.形式.P1 ||
pnm.Format == PNM.形式.P2 ||
pnm.Format == PNM.形式.P3)
{
pnm.Pixls = 平文ﾋﾟｸｾﾙ読み込み(ms.GetBuffer(), pnm);
}
else if (pnm.Format == PNM.形式.P4 ||
pnm.Format == PNM.形式.P5 ||
pnm.Format == PNM.形式.P6)
{
pnm.Pixls = ﾊﾞｲﾅﾘーﾋﾟｸｾﾙ読み込み(ms.GetBuffer(), pnm);
}
else if (pnm.Format == PNM.形式.P7)
{
pnm.Pixls = ﾚﾍﾞﾙ7のﾋﾟｸｾﾙﾃﾞﾀーを読み込む(ms.GetBuffer(), pnm);
}
else
{
throw new Xi.それ対応してない($"むり {pnm.Format}");
}
}
return(pnm);
}
/// <summary>
/// 平文ﾋﾟｸｾﾙを読み出す
/// </summary>
/// <param name="buf"></param>
/// <param name="pnm"></param>
/// <returns></returns>
private int?ReadTPixel(ref byte[] buf, PNM pnm)
{
bool eof = false;
bool boo = false;
var i = pnm.現在位置;
var len = 0;
while (それ区切り文字(buf[i]))
{
i++;
}
if (i != pnm.現在位置)
{
pnm.現在位置 = i;
}
while (true)
{
if (i >= buf.Length)
{
eof = true;
break;
}
byte a = buf[i++];
if (それ区切り文字(a))
{
boo = true;
continue;
}
if (boo)
{
i--;
break;
}
len++;
}
if (len == 0 && eof)
{
return(null);
}
var gs = System.Text.Encoding.ASCII.GetString(buf, pnm.現在位置, len);
var r = int.Parse(gs);
pnm.現在位置 = i;
return(r);
}
/// <summary>
/// ﾊﾞｲﾅﾘー形式のﾋﾟｸｾﾙﾃﾞーﾀを読み込む(P7除く)
/// </summary>
/// <param name="buf"></param>
/// <param name="pnm"></param>
/// <returns></returns>
private Xi.ぉ[] ﾊﾞｲﾅﾘーﾋﾟｸｾﾙ読み込み(byte[] buf, PNM pnm)
{
switch (pnm.Format)
{
case PNM.形式.P4:
return(ﾚﾍﾞﾙ4を読み込む(ref buf, pnm));
case PNM.形式.P5:
return(ﾚﾍﾞﾙ5を読み込む(ref buf, pnm));
case PNM.形式.P6:
return(ﾚﾍﾞﾙ6を読み込む(ref buf, pnm));
default:
throw new Xi.およよ($"しらん {pnm.Format}");
}
}
/// <summary>
/// P7ﾌｫーﾏｯﾄのﾍｯﾀﾞーを解析する
/// </summary>
/// <param name="stream"></param>
/// <param name="pnm"></param>
private void ﾚﾍﾞﾙ7ﾍｯﾀﾞーを読み込む(System.IO.Stream stream, PNM pnm)
{
while (true)
{
var line = ReadLine(stream).Trim();
if (line.Length == 0)
{
continue;
}
var tok = line.Split(new char[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
if (tok[0].Equals("ENDHDR", StringComparison.CurrentCultureIgnoreCase))
{
break;
}
switch (tok[0].ToUpper())
{
case "WIDTH":
pnm.Width = int.Parse(tok[1]);
break;
case "HEIGHT":
pnm.Height = int.Parse(tok[1]);
break;
case "DEPTH":
pnm.Depth = int.Parse(tok[1]);
break;
case "MAXVAL":
pnm.Maxval = int.Parse(tok[1]);
break;
case "TUPLTYPE":
pnm.TupleType = ﾇﾌﾟーﾘに変換(tok[1]);
break;
default:
throw new Xi.およよ($"しらん {tok[0]}");
}
}
}
/// <summary>
/// 平文ﾋﾟｸｾﾙを読み込む
/// </summary>
/// <param name="buf"></param>
/// <param name="pnm"></param>
/// <returns></returns>
private Xi.ぉ[] 平文ﾋﾟｸｾﾙ読み込み(byte[] buf, PNM pnm)
{
pnm.現在位置 = 0;
int cp = 0;
var r = new Xi.ぉ[pnm.Width * pnm.Height];
var kr = new Xi.ぉ(0, 0, 0);
for (int i = 0; i < r.Count(); ++i)
{
var q = pnm.Format == PNM.形式.P1 ? ReadEPixel(ref buf, pnm) : ReadTPixel(ref buf, pnm);
if (null == q)
{
break;
}
r[i] = new Xi.ぉ(0, 0, 0, 0xFF);
switch (pnm.Format)
{
case PNM.形式.P1:
var v = (q.Value == 0) ? 0xff : 0x00;
r[i].ぃ(v, v, v);
break;
case PNM.形式.P2:
r[i].ぃ(q.Value, q.Value, q.Value);
break;
case PNM.形式.P3:
r[i].R = q.Value;
r[i].G = ReadTPixel(ref buf, pnm).Value;
r[i].B = ReadTPixel(ref buf, pnm).Value;
break;
}
if (cp++ >= r.Length)
{
break;
}
}
return(r);
}