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);
}
/// <summary>
/// Given an indexed line with a palette, unpacks as a RGB array
/// </summary>
/// <param name="line">ImageLine as returned from PngReader</param>
/// <param name="pal">Palette chunk</param>
/// <param name="trns">TRNS chunk (optional)</param>
/// <param name="buf">Preallocated array, optional</param>
/// <returns>R G B (one byte per sample)</returns>
public static int[] Palette2rgb(ImageLine line, PngChunkPLTE pal, PngChunkTRNS trns, int[] buf)
{
bool isalpha = trns != null;
int channels = isalpha ? 4 : 3;
int nsamples = line.ImgInfo.Cols * channels;
if (buf == null || buf.Length < nsamples)
{
buf = new int[nsamples];
}
if (!line.SamplesUnpacked)
{
line = line.unpackToNewImageLine();
}
bool isbyte = line.SampleType == Hjg.Pngcs.ImageLine.ESampleType.BYTE;
int nindexesWithAlpha = trns != null?trns.GetPalletteAlpha().Length : 0;
for (int c = 0; c < line.ImgInfo.Cols; c++)
{
int index = isbyte ? (line.ScanlineB[c] & 0xFF) : line.Scanline[c];
pal.GetEntryRgb(index, buf, c * channels);
if (isalpha)
{
int alpha = index < nindexesWithAlpha?trns.GetPalletteAlpha()[index] : 255;
buf[c * channels + 3] = alpha;
}
}
return(buf);
}
public override void CloneDataFromRead(PngChunk other)
{
PngChunkTRNS otherx = (PngChunkTRNS)other;
Gray = otherx.Gray;
Rgb = otherx.Rgb;
if (otherx.PaletteAlpha != null)
{
PaletteAlpha = new int[otherx.PaletteAlpha.Length];
System.Array.Copy(otherx.PaletteAlpha, 0, PaletteAlpha, 0, PaletteAlpha.Length);
}
}
private void CloneData(PngChunkTRNS other)
{
if (other is null)
{
throw new System.ArgumentNullException(nameof(other));
}
gray = other.gray;
red = other.red;
green = other.green;
blue = other.blue;
if (other.paletteAlpha is object)
{
paletteAlpha = new int[other.paletteAlpha.Length];
System.Array.Copy(other.paletteAlpha, 0, paletteAlpha, 0, paletteAlpha.Length);
}
}
/// <summary>
/// Given an indexed line with a palette, unpacks as a RGB array
/// </summary>
/// <param name="line">ImageLine as returned from PngReader</param>
/// <param name="pal">Palette chunk</param>
/// <param name="trns">TRNS chunk (optional)</param>
/// <param name="buf">Preallocated array, optional</param>
/// <returns>R G B (one byte per sample)</returns>
public static int[] Palette2rgb(ImageLine line, PngChunkPLTE pal, PngChunkTRNS trns, int[] buf)
{
if (line is null)
{
throw new ArgumentNullException(nameof(line));
}
if (pal is null)
{
throw new ArgumentNullException(nameof(pal));
}
var isalpha = trns is object;
var channels = isalpha ? 4 : 3;
var nsamples = line.ImgInfo.Cols * channels;
if (buf is null || buf.Length < nsamples)
{
buf = new int[nsamples];
}
if (!line.SamplesUnpacked)
{
line = line.UnpackToNewImageLine();
}
var isbyte = line.SampleType == Hjg.Pngcs.ImageLine.ESampleType.BYTE;
var nindexesWithAlpha = trns?.GetPalletteAlpha().Length ?? 0;
for (var c = 0; c < line.ImgInfo.Cols; c++)
{
var index = isbyte ? (line.ScanlineB[c] & 0xFF) : line.Scanline[c];
pal.GetEntryRgb(index, buf, c * channels);
if (isalpha)
{
buf[(c * channels) + 3] = index < nindexesWithAlpha?trns.GetPalletteAlpha()[index] : 255;
}
}
return(buf);
}
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 sprite_params setup(PngReader _png_reader, bool _apply_palette, bool _crop_image, int _palette_slot)
{
sprite_params spr_params = new sprite_params(this);
if (_png_reader == null)
{
return(spr_params);
}
int img_width = _png_reader.ImgInfo.Cols;
int img_height = _png_reader.ImgInfo.Rows;
List <byte[]> lines_arr = new List <byte[]>(img_height);
int i;
int j;
int min_x = 0;
int max_x = img_width - 1;
int min_y = 0;
int max_y = img_height - 1;
byte[] pixels_line = null;
PngChunkPLTE plte = _png_reader.GetMetadata().GetPLTE();
PngChunkTRNS trns = _png_reader.GetMetadata().GetTRNS();
ImageLine line = null;
int alpha_ind = -1;
int num_colors = plte.GetNentries();
// detect useful image borders
{
if (trns != null)
{
int size;
alpha_ind = trns.GetPalletteAlpha().Length - 1;
if (_crop_image)
{
min_x = img_width + 1;
max_x = -1;
min_y = img_height + 1;
max_y = -1;
}
bool transp_line = false;
for (i = 0; i < img_height; i++)
{
line = _png_reader.ReadRowByte(i);
if (line.ImgInfo.Packed)
{
line = line.unpackToNewImageLine();
}
pixels_line = new byte[img_width];
Array.Copy(line.GetScanlineByte(), pixels_line, img_width);
lines_arr.Add(pixels_line);
size = pixels_line.Length;
transp_line = true;
for (j = 0; j < size; j++)
{
// if pixel is not transparent
if (_crop_image && (pixels_line[j] != alpha_ind))
{
if (min_x > j)
{
min_x = j;
}
if (max_x < j)
{
max_x = j;
}
transp_line = false;
}
}
// if line is not transparent
if (_crop_image && !transp_line)
{
if (min_y > i)
{
min_y = i;
}
if (max_y < i)
{
max_y = i;
}
}
}
}
// find nearest colors
if (_apply_palette)
{
#if DEF_FIXED_LEN_PALETTE16_ARR
palettes_array plt_arr = palettes_array.Instance;
plt_arr.palette_index = _palette_slot;
#endif
for (i = 0; i < num_colors; i++)
{
#if DEF_FIXED_LEN_PALETTE16_ARR
plt_arr.update_color(_palette_slot, i, utils.find_nearest_color_ind(plte.GetEntry((trns != null) ? (i + alpha_ind) % num_colors:i)));
#else
palette_group.Instance.get_palettes_arr()[i / utils.CONST_NUM_SMALL_PALETTES].get_color_inds()[i % utils.CONST_NUM_SMALL_PALETTES] = utils.find_nearest_color_ind(plte.GetEntry((trns != null) ? (i + alpha_ind) % num_colors:i));
#endif
}
#if DEF_FIXED_LEN_PALETTE16_ARR
plt_arr.update_palette();
#else
for (i = 0; i < utils.CONST_NUM_SMALL_PALETTES; i++)
{
palette_group.Instance.get_palettes_arr()[i].update();
}
#endif
#if DEF_NES
palette_group.Instance.active_palette = 0;
#endif
}
// fill the lines_arr if sprite has no transparency
if (lines_arr.Count == 0)
{
for (i = 0; i < img_height; i++)
{
line = _png_reader.ReadRowByte(i);
if (line.ImgInfo.Packed)
{
line = line.unpackToNewImageLine();
}
pixels_line = new byte[img_width];
Array.Copy(line.GetScanlineByte(), pixels_line, img_width);
lines_arr.Add(pixels_line);
}
}
}
return(cut_CHRs(spr_params, min_x, max_x, min_y, max_y, lines_arr, (trns != null), alpha_ind, num_colors, _crop_image, _palette_slot));
}
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;
}
}
}
}
}
