public override Photo Decode(string file)
{
byte[] buffer = File.ReadAllBytes(file);
int nBufferLength = buffer.Length;
uint nImageWidth, nImageHeight;
uint nBitsPerPixel;
uint nBitsCount;
//byte[] imageBits;
NativePhoto photo = null;
unsafe
{
fixed(byte *pBuffer = buffer)
{
FIMEMORY fiMemory = FreeImage.OpenMemory((IntPtr)pBuffer, nBufferLength);
FREE_IMAGE_FORMAT fiFormat = FreeImage.GetFileTypeFromMemory(fiMemory, nBufferLength);
FIBITMAP fiBitmap = FreeImage.LoadFromMemory(fiFormat, fiMemory, 0);
FREE_IMAGE_COLOR_TYPE colorType = FreeImage.GetColorType(fiBitmap);
HBitmap hBitmap;
HPalette hPalette = IntPtr.Zero, hOldPalette = IntPtr.Zero;
nImageHeight = FreeImage.GetHeight(fiBitmap);
nImageWidth = FreeImage.GetWidth(fiBitmap);
nBitsPerPixel = FreeImage.GetBPP(fiBitmap);
//if (nBitsPerPixel <= 8)
//{
// RGBQUAD[] rgb = FreeImage.GetPaletteCopy(fiBitmap);
// LOGPALETTE logPalette = new LOGPALETTE();
// logPalette.nPalVersion = 0x300;
// logPalette.nPalEntries = 1 << 8;
// PaletteEntry[] palEntries = new PaletteEntry[logPalette.nPalEntries];
// for (int i = 0; i < logPalette.nPalEntries; i++)
// {
// palEntries[i].Blue = rgb[i].rgbBlue;
// palEntries[i].Green = rgb[i].rgbGreen;
// palEntries[i].Red = rgb[i].rgbRed;
// }
// fixed (PaletteEntry* pPalletteEntries = palEntries)
// {
// logPalette.pPalEntry = (IntPtr)pPalletteEntries;
// hPalette = CreatePalette(&logPalette);
// }
//}
HDC hDC = GetDC(IntPtr.Zero);
Debug.Assert(hDC != IntPtr.Zero);
//if (hPalette != IntPtr.Zero)
//{
// hOldPalette = SelectPalette(hDC, hPalette, false);
// RealizePalette(hDC);
//}
hBitmap = CreateCompatibleBitmap(hDC, (int)nImageWidth, (int)nImageHeight);
// hBitmap = CreateDIBitmap(hDC, FreeImage.FreeImage_GetInfoHeader(fiBitmap), 0x04,
//FreeImage.GetBits(fiBitmap), FreeImage.FreeImage_GetInfo(fiBitmap), ColorUseOptions.DIB_PAL_COLORS);
int nResult = SetDIBits(hDC, hBitmap, 0, nImageHeight, FreeImage.GetBits(fiBitmap),
FreeImage.FreeImage_GetInfo(fiBitmap), ColorUseOptions.DIB_RGB_COLORS);
Debug.Assert(nResult != 0);
if (hOldPalette != IntPtr.Zero)
{
SelectPalette(hDC, hOldPalette, false);
}
int width = (int)(FreeImage.GetWidth(fiBitmap));
int height = (int)(FreeImage.GetHeight(fiBitmap));
photo = new NativePhoto(hBitmap, width, height);
ReleaseDC(IntPtr.Zero, hDC);
//if (hPalette != IntPtr.Zero)
// info.PaletteHandle = hPalette;
FreeImage.Unload(fiBitmap);
FreeImage.CloseMemory(fiMemory);
}
}
return(photo);
}
public static extern HPalette SelectPalette
(
HDC hdc, // handle to DC
HPalette hpal, // handle to logical palette
bool bForceBackground // foreground or background mode
);
