private static bool RecolorImage(IcImage img, float fHue)
{
const int cbHeader = NativeMethods.BITMAPINFOHEADERSize;
if (Marshal.SizeOf(typeof(BITMAPINFOHEADER)) != cbHeader)
{
Debug.Assert(false);
return(false);
}
byte[] pb = img.Data;
if (pb.Length < cbHeader)
{
Debug.Assert(false); return(false);
}
BITMAPINFOHEADER h = MemUtil.BytesToStruct <BITMAPINFOHEADER>(pb, 0);
if (h.biSize != cbHeader)
{
Debug.Assert(h.biSize == 0x474E5089); // PNG
return(false);
}
Debug.Assert(h.biPlanes == 1);
Debug.Assert((h.biClrUsed == 0) && (h.biClrImportant == 0));
if (h.biCompression != 0)
{
Debug.Assert(false); return(false);
}
int w = h.biWidth;
if (w <= 0)
{
Debug.Assert(false); return(false);
}
int hAbs = Math.Abs(h.biHeight);
if ((hAbs != w) && (hAbs != (w << 1)))
{
Debug.Assert(false); return(false);
}
ushort uBpp = h.biBitCount;
if ((uBpp == 1) || (uBpp == 4) || (uBpp == 8))
{
RecolorPalette(pb, cbHeader, 1 << uBpp, fHue);
}
else if ((uBpp == 24) || (uBpp == 32))
{
if (!RecolorPixelData(pb, cbHeader, w, w, uBpp, fHue))
{
return(false);
}
}
else
{
Debug.Assert(false); return(false);
}
Debug.Assert(((w < 256) && (img.Entry.bWidth == w)) ||
((w >= 256) && (img.Entry.bWidth == 0)));
Debug.Assert(((w < 256) && (img.Entry.bHeight == w)) ||
((w >= 256) && (img.Entry.bHeight == 0)));
Debug.Assert(((uBpp < 8) && (img.Entry.bColorCount == (1 << uBpp))) ||
((uBpp >= 8) && (img.Entry.bColorCount == 0)));
Debug.Assert(img.Entry.bReserved == 0);
Debug.Assert(img.Entry.wPlanes == h.biPlanes);
Debug.Assert(img.Entry.wBitCount == uBpp);
return(true);
}
private static List <IcImage> GetImages(Icon ico)
{
List <IcImage> l = new List <IcImage>();
byte[] pb;
using (MemoryStream ms = new MemoryStream())
{
ico.Save(ms);
pb = ms.ToArray();
}
const int cbDir = NativeMethods.ICONDIRSize;
if (Marshal.SizeOf(typeof(ICONDIR)) != cbDir)
{
Debug.Assert(false); return(l);
}
const int cbEntry = NativeMethods.ICONDIRENTRYSize;
if (Marshal.SizeOf(typeof(ICONDIRENTRY)) != cbEntry)
{
Debug.Assert(false); return(l);
}
int iPos = 0;
ICONDIR d = MemUtil.BytesToStruct <ICONDIR>(pb, iPos);
iPos += cbDir;
if (d.idReserved != 0)
{
Debug.Assert(false); return(l);
}
if (d.idType != 1)
{
Debug.Assert(false); return(l);
}
for (uint u = 0; u < d.idCount; ++u)
{
IcImage img = new IcImage();
img.Entry = MemUtil.BytesToStruct <ICONDIRENTRY>(pb, iPos);
iPos += cbEntry;
img.Data = MemUtil.Mid(pb, (int)img.Entry.dwImageOffset,
(int)img.Entry.dwBytesInRes);
l.Add(img);
}
#if DEBUG
int cbSum = cbDir + (l.Count * cbEntry);
foreach (IcImage img in l)
{
cbSum += img.Data.Length;
}
Debug.Assert(cbSum == pb.Length); // No extra data
#endif
return(l);
}
