private unsafe short ReadPixelsProc(IntPtr port, PSScaling *scaling, VRect *writeRect, PixelMemoryDesc *destination, VRect *wroteRect)
{
#if DEBUG
DebugUtils.Ping(DebugFlags.ChannelPorts, string.Format("port: {0}, rect: {1}", port.ToString(), DebugUtils.PointerToString(writeRect)));
#endif
if (scaling == null || writeRect == null || destination == null)
{
return(PSError.paramErr);
}
if (destination->depth != 8)
{
return(PSError.errUnsupportedDepth);
}
if ((destination->bitOffset % 8) != 0)
{
return(PSError.errUnsupportedBitOffset);
}
if ((destination->colBits % 8) != 0)
{
return(PSError.errUnsupportedColBits);
}
if ((destination->rowBits % 8) != 0)
{
return(PSError.errUnsupportedRowBits);
}
int channel = port.ToInt32();
if (channel < PSConstants.ChannelPorts.Red || channel > PSConstants.ChannelPorts.SelectionMask)
{
return(PSError.errUnknownPort);
}
VRect srcRect = scaling->sourceRect;
VRect dstRect = scaling->destinationRect;
int srcWidth = srcRect.right - srcRect.left;
int srcHeight = srcRect.bottom - srcRect.top;
int dstWidth = dstRect.right - dstRect.left;
int dstHeight = dstRect.bottom - dstRect.top;
if (channel == PSConstants.ChannelPorts.SelectionMask)
{
if (srcWidth == dstWidth && srcHeight == dstHeight)
{
FillSelectionMask(destination, filterImageProvider.Mask, srcRect);
}
else if (dstWidth < srcWidth || dstHeight < srcHeight) // scale down
{
if ((scaledSelectionMask == null) || scaledSelectionMask.Width != dstWidth || scaledSelectionMask.Height != dstHeight)
{
if (scaledSelectionMask != null)
{
scaledSelectionMask.Dispose();
scaledSelectionMask = null;
}
scaledSelectionMask = new MaskSurface(dstWidth, dstHeight);
scaledSelectionMask.SuperSampleFitSurface(filterImageProvider.Mask);
}
FillSelectionMask(destination, scaledSelectionMask, dstRect);
}
else if (dstWidth > srcWidth || dstHeight > srcHeight) // scale up
{
if ((scaledSelectionMask == null) || scaledSelectionMask.Width != dstWidth || scaledSelectionMask.Height != dstHeight)
{
if (scaledSelectionMask != null)
{
scaledSelectionMask.Dispose();
scaledSelectionMask = null;
}
scaledSelectionMask = new MaskSurface(dstWidth, dstHeight);
scaledSelectionMask.BicubicFitSurface(filterImageProvider.Mask);
}
FillSelectionMask(destination, scaledSelectionMask, dstRect);
}
}
else
{
if (srcWidth == dstWidth && srcHeight == dstHeight)
{
FillChannelData(channel, destination, filterImageProvider.Source, srcRect);
}
else if (dstWidth < srcWidth || dstHeight < srcHeight) // scale down
{
if ((scaledChannelSurface == null) || scaledChannelSurface.Width != dstWidth || scaledChannelSurface.Height != dstHeight)
{
if (scaledChannelSurface != null)
{
scaledChannelSurface.Dispose();
scaledChannelSurface = null;
}
scaledChannelSurface = new Surface(dstWidth, dstHeight);
scaledChannelSurface.SuperSampleFitSurface(filterImageProvider.Source);
}
FillChannelData(channel, destination, scaledChannelSurface, dstRect);
}
else if (dstWidth > srcWidth || dstHeight > srcHeight) // scale up
{
if ((scaledChannelSurface == null) || scaledChannelSurface.Width != dstWidth || scaledChannelSurface.Height != dstHeight)
{
if (scaledChannelSurface != null)
{
scaledChannelSurface.Dispose();
scaledChannelSurface = null;
}
scaledChannelSurface = new Surface(dstWidth, dstHeight);
scaledChannelSurface.BicubicFitSurface(filterImageProvider.Source);
}
FillChannelData(channel, destination, scaledChannelSurface, dstRect);
}
}
if (wroteRect != null)
{
*wroteRect = dstRect;
}
return(PSError.noErr);
}
