public void Write(System.Drawing.Image i, System.IO.Stream s)
{
if (!(i is Bitmap))
{
throw new ArgumentException("FreeImageEncoder only works with bitmaps");
}
FIBITMAP bit = FreeImage.CreateFromBitmap(i as Bitmap);
if (bit.IsNull)
{
throw new ImageProcessingException("FreeImageEncoder failed to convert System.Drawing.Bitmap to FIBITMAP");
}
if (Format == FREE_IMAGE_FORMAT.FIF_GIF || (Format == FREE_IMAGE_FORMAT.FIF_PNG && colors != -1))
{
FreeImage.SetTransparent(bit, true);
FIBITMAP old = bit;
//TODO - ColorQuantizeEx returns null no matter what we do.. Is it because the image is 32-bit?
bit = FreeImage.ColorQuantizeEx(bit, FREE_IMAGE_QUANTIZE.FIQ_NNQUANT, 256, 1, RGBQUAD.ToRGBQUAD(new Color[] { Color.Transparent }));
if (bit.IsNull)
{
bit = old;
}
else if (bit != old)
{
FreeImage.UnloadEx(ref old);
}
}
FreeImage.SaveToStream(ref bit, s, Format, EncodingOptions, true);
}
private FIBITMAP formatImage(FIBITMAP dib, int icoSize, int dstBpp)
{
const int hideOpacity = 128;
//FIBITMAP dibTmp = FreeImage.Rescale(dib, icoSize, icoSize, FREE_IMAGE_FILTER.FILTER_BICUBIC);
FIBITMAP dibTmp = FreeImage.Rescale(dib, icoSize, icoSize, FREE_IMAGE_FILTER.FILTER_LANCZOS3);
if (dstBpp >= 32)
{
return(dibTmp);
}
int paletteSize = (int)Math.Pow(2, dstBpp);
byte lastPaletteIdx = (byte)(paletteSize - 1);
// quantize ico
// reserve last one palette, to set transparent
//FIBITMAP dibTmp2 = FreeImage.ConvertColorDepth(dibTmp, FREE_IMAGE_COLOR_DEPTH.FICD_04_BPP);
FIBITMAP dibOut = FreeImage.ColorQuantizeEx(dibTmp, FREE_IMAGE_QUANTIZE.FIQ_WUQUANT, paletteSize - 1, null, dstBpp);
// set transparent color index to last one palette
RGBQUAD rgb = new RGBQUAD();
byte val = 0;
for (int m = icoSize - 1; m >= 0; --m)
{
string str = "";
for (int n = icoSize - 1; n >= 0; --n)
{
FreeImage.GetPixelIndex(dibOut, (uint)n, (uint)m, out val);
FreeImage.GetPixelColor(dibTmp, (uint)n, (uint)m, out rgb);
//uint val = rgb.uintValue & 0x00FFFFFF;
if (rgb.rgbReserved <= hideOpacity)
{
FreeImage.SetPixelIndex(dibOut, (uint)n, (uint)m, ref lastPaletteIdx);
}
str += val + ",";
}
}
FreeImage.Unload(dibTmp);
//uint bpp = FreeImage.GetBPP(dibOut);
// set transarency table
try {
RGBQUAD[] palette = new Palette(dibOut).AsArray;
byte[] transparency = new byte[palette.Length];
for (int m = 0; m < palette.Length; ++m)
{
transparency[m] = 0xFF;
if (m == lastPaletteIdx)
{
transparency[m] = 0;
}
}
FreeImage.SetTransparencyTable(dibOut, transparency);
} catch (Exception) { }
return(dibOut);
}