public override ImageData Read(IBinaryStream stream, ImageMetaData info)
{
var meta = (WbmMetaData)info;
var section = WpxSection.Find(meta.Header, 0x11, meta.EntryCount, meta.EntrySize);
if (null == section)
{
throw new InvalidFormatException();
}
PixelFormat format;
int pixel_size;
switch (meta.BPP)
{
case 24:
format = PixelFormats.Bgr24;
pixel_size = 3;
break;
case 32:
format = PixelFormats.Bgr32;
pixel_size = 4;
break;
case 16:
format = PixelFormats.Bgr555;
pixel_size = 2;
break;
case 8:
format = PixelFormats.Indexed8;
pixel_size = 1;
break;
default:
throw new NotSupportedException("Not supported WBM bitdepth");
}
int stride = ((int)meta.Width * pixel_size + 3) & -4;
var reader = new WbmReader(stream, section);
var pixels = reader.Unpack(stride, pixel_size, section.DataFormat);
if (null == pixels)
{
throw new InvalidFormatException();
}
if (8 == meta.BPP)
{
section = WpxSection.Find(meta.Header, 0x12, meta.EntryCount, meta.EntrySize);
if (null == section)
{
return(ImageData.Create(info, PixelFormats.Gray8, null, pixels, stride));
}
reader = new WbmReader(stream, section);
var palette_data = reader.Unpack(48, 3, section.DataFormat);
var palette = CreatePalette(palette_data);
return(ImageData.Create(info, PixelFormats.Indexed8, palette, pixels, stride));
}
if (meta.BPP < 24)
{
return(ImageData.Create(info, format, null, pixels, stride));
}
section = WpxSection.Find(meta.Header, 0x13, meta.EntryCount, meta.EntrySize);
if (null == section)
{
return(ImageData.Create(info, format, null, pixels, stride));
}
int alpha_stride = ((int)meta.Width + 3) & -4;
byte[] alpha = null;
try
{
reader = new WbmReader(stream, section);
alpha = reader.Unpack(alpha_stride, 1, section.DataFormat);
}
catch { }
if (null == alpha)
{
return(ImageData.Create(info, format, null, pixels, stride));
}
byte[] alpha_image = new byte[4 * meta.Width * meta.Height];
int dst = 0;
for (int y = 0; y < meta.Height; ++y)
{
int alpha_src = y * alpha_stride;
int src = y * stride;
for (int x = 0; x < meta.Width; ++x)
{
alpha_image[dst++] = pixels[src];
alpha_image[dst++] = pixels[src + 1];
alpha_image[dst++] = pixels[src + 2];
alpha_image[dst++] = alpha[alpha_src + x];
src += pixel_size;
}
}
return(ImageData.Create(info, PixelFormats.Bgra32, null, alpha_image, (int)meta.Width * 4));
}
public override ImageData Read(Stream stream, ImageMetaData info)
{
var meta = info as WbmMetaData;
if (null == meta)
throw new ArgumentException ("WbmFormat.Read should be supplied with WbmMetaData", "info");
var section = WpxSection.Find (meta.Header, 0x11, meta.EntryCount, meta.EntrySize);
if (null == section)
throw new InvalidFormatException();
PixelFormat format;
int pixel_size;
switch (meta.BPP)
{
case 24:
format = PixelFormats.Bgr24;
pixel_size = 3;
break;
case 32:
format = PixelFormats.Bgr32;
pixel_size = 4;
break;
case 16:
format = PixelFormats.Bgr555;
pixel_size = 2;
break;
default:
throw new NotSupportedException ("Not supported WBM bitdepth");
}
int stride = ((int)meta.Width * pixel_size + 3) & -4;
var reader = new WbmReader (stream, section);
var pixels = reader.Unpack (stride, pixel_size, section.DataFormat);
if (null == pixels)
throw new InvalidFormatException();
if (meta.BPP < 24)
return ImageData.Create (info, format, null, pixels, stride);
section = WpxSection.Find (meta.Header, 0x13, meta.EntryCount, meta.EntrySize);
if (null == section)
return ImageData.Create (info, format, null, pixels, stride);
int alpha_stride = ((int)meta.Width + 3) & -4;
byte[] alpha = null;
try
{
reader = new WbmReader (stream, section);
alpha = reader.Unpack (alpha_stride, 1, section.DataFormat);
}
catch { }
if (null == alpha)
return ImageData.Create (info, format, null, pixels, stride);
byte[] alpha_image = new byte[4*meta.Width*meta.Height];
int dst = 0;
for (int y = 0; y < meta.Height; ++y)
{
int alpha_src = y * alpha_stride;
int src = y * stride;
for (int x = 0; x < meta.Width; ++x)
{
alpha_image[dst++] = pixels[src];
alpha_image[dst++] = pixels[src+1];
alpha_image[dst++] = pixels[src+2];
alpha_image[dst++] = alpha[alpha_src+x];
src += pixel_size;
}
}
return ImageData.Create (info, PixelFormats.Bgra32, null, alpha_image, (int)meta.Width*4);
}
