public static SafeTransformHandle CreateTransform(SafeProfileHandle sourceProfile, SafeProfileHandle destinationProfile, mscmsIntent dwIntent)
{
if (sourceProfile == null || sourceProfile.IsInvalid)
{
throw new ArgumentNullException("sourceProfile");
}
if (destinationProfile == null || destinationProfile.IsInvalid)
{
throw new ArgumentNullException("destinationProfile");
}
IntPtr[] handles = new IntPtr[2];
bool success = true;
sourceProfile.DangerousAddRef(ref success);
destinationProfile.DangerousAddRef(ref success);
try
{
handles[0] = sourceProfile.DangerousGetHandle();
handles[1] = destinationProfile.DangerousGetHandle();
uint[] dwIntents = new uint[2] {
(uint)dwIntent, (uint)dwIntent
};
var htransform = CreateMultiProfileTransform(
handles, (uint)handles.Length,
dwIntents, (uint)dwIntents.Length,
BEST_MODE | USE_RELATIVE_COLORIMETRIC, 0);
if (htransform.IsInvalid)
{
throw new Win32Exception();
}
return(htransform);
}
finally
{
sourceProfile.DangerousRelease();
destinationProfile.DangerousRelease();
}
}
public static unsafe RGBQUAD[] TransformColorsTo_sRGB(SafeProfileHandle source, RGBQUAD[] color, mscmsIntent dwIntent)
{
var colorSize = Environment.Is64BitProcess ? 16 : 8;
var size = colorSize * color.Length;
// https://docs.microsoft.com/en-us/windows/win32/api/icm/nf-icm-translatecolors
// https://docs.microsoft.com/en-us/windows/win32/api/icm/ns-icm-color
IntPtr paInputColors = Marshal.AllocHGlobal(size);
IntPtr paOutputColors = Marshal.AllocHGlobal(size);
const double cmax = 255d;
const double nmax = 0xFFFF;
const ushort nmask = 0xFFFF;
try
{
var inputPtr = (byte *)paInputColors;
foreach (var c in color)
{
var nclr = (long)(c.rgbRed / cmax * nmax) | ((long)(c.rgbGreen / cmax * nmax) << 16) | ((long)(c.rgbBlue / cmax * nmax) << 32);
*((long *)inputPtr) = nclr;
inputPtr += colorSize;
}
using (var dest = OpenProfile_sRGB())
using (var transform = CreateTransform(source, dest, dwIntent))
{
var success = TranslateColors(transform, paInputColors, (uint)color.Length, COLOR_TYPE.COLOR_3_CHANNEL, paOutputColors, COLOR_TYPE.COLOR_3_CHANNEL);
if (!success)
{
throw new Win32Exception();
}
var outputPtr = (byte *)paOutputColors;
var output = new RGBQUAD[color.Length];
for (int i = 0; i < color.Length; i++)
{
long nclr = *((long *)outputPtr);
output[i] = new RGBQUAD
{
rgbRed = (byte)((nclr & nmask) / nmax * cmax),
rgbGreen = (byte)(((nclr >> 16) & nmask) / nmax * cmax),
rgbBlue = (byte)(((nclr >> 32) & nmask) / nmax * cmax),
};
outputPtr += colorSize;
}
return(output);
}
}
finally
{
Marshal.FreeHGlobal(paInputColors);
Marshal.FreeHGlobal(paOutputColors);
}
}
public static unsafe void TransformPixelsTo_sRGB(SafeProfileHandle source, mscmsPxFormat pxFormat, void *data, int width, int height, uint stride, mscmsIntent dwIntent)
{
using (var dest = OpenProfile_sRGB())
using (var transform = CreateTransform(source, dest, dwIntent))
{
var success = TranslateBitmapBits(transform, data, pxFormat, (uint)width, (uint)height, stride, data, pxFormat, stride, IntPtr.Zero, IntPtr.Zero);
if (!success)
{
throw new Win32Exception();
}
}
}
