public bool CopyTo(SKBitmap destination, SKColorType colorType)
{
// TODO: instead of working on `destination` directly, we should
// create a temporary bitmap and then inject the data
if (destination == null)
{
throw new ArgumentNullException(nameof(destination));
}
if (!CanCopyTo(colorType))
{
return(false);
}
SKPixmap srcPM = PeekPixels();
if (srcPM == null)
{
return(false);
}
SKImageInfo dstInfo = srcPM.Info.WithColorType(colorType);
switch (colorType)
{
case SKColorType.Rgb565:
// CopyTo() is not strict on alpha type. Here we set the src to opaque to allow
// the call to ReadPixels() to succeed and preserve this lenient behavior.
if (srcPM.AlphaType != SKAlphaType.Opaque)
{
srcPM = srcPM.WithAlphaType(SKAlphaType.Opaque);
}
dstInfo.AlphaType = SKAlphaType.Opaque;
break;
case SKColorType.RgbaF16:
// The caller does not have an opportunity to pass a dst color space.
// Assume that they want linear sRGB.
dstInfo.ColorSpace = SKColorSpace.CreateSrgbLinear();
if (srcPM.ColorSpace == null)
{
// We can't do a sane conversion to F16 without a dst color space.
// Guess sRGB in this case.
srcPM = srcPM.WithColorSpace(SKColorSpace.CreateSrgb());
}
break;
}
destination.Reset(); // TODO: is this needed?
if (!destination.TryAllocPixels(dstInfo, colorType == SKColorType.Index8 ? ColorTable : null))
{
return(false);
}
SKPixmap dstPM = destination.PeekPixels();
if (dstPM == null)
{
return(false);
}
// We can't do a sane conversion from F16 without a src color space. Guess sRGB in this case.
if (srcPM.ColorType == SKColorType.RgbaF16 && dstPM.ColorSpace == null)
{
dstPM = dstPM.WithColorSpace(SKColorSpace.CreateSrgb());
}
// ReadPixels does not yet support color spaces with parametric transfer functions. This
// works around that restriction when the color spaces are equal.
if (colorType != SKColorType.RgbaF16 && srcPM.ColorType != SKColorType.RgbaF16 && dstPM.ColorSpace == srcPM.ColorSpace)
{
dstPM = dstPM.WithColorSpace(null);
srcPM = srcPM.WithColorSpace(null);
}
if (!srcPM.ReadPixels(dstPM))
{
return(false);
}
return(true);
}