private unsafe short CreateDitheredChannelPortSurface(SurfaceBase source)
{
int width = source.Width;
int height = source.Height;
try
{
switch (imageMode)
{
case ImageModes.Gray16:
ditheredChannelImageMode = ImageModes.GrayScale;
ditheredChannelSurface = SurfaceFactory.CreateFromImageMode(width, height, ditheredChannelImageMode);
for (int y = 0; y < height; y++)
{
ushort *src = (ushort *)source.GetRowAddressUnchecked(y);
byte * dst = ditheredChannelSurface.GetRowAddressUnchecked(y);
for (int x = 0; x < width; x++)
{
*dst = (byte)((*src * 10) / 1285);
src++;
dst++;
}
}
break;
case ImageModes.RGB48:
ditheredChannelImageMode = ImageModes.RGB;
ditheredChannelSurface = SurfaceFactory.CreateFromImageMode(width, height, ditheredChannelImageMode);
for (int y = 0; y < height; y++)
{
ushort *src = (ushort *)source.GetRowAddressUnchecked(y);
byte * dst = ditheredChannelSurface.GetRowAddressUnchecked(y);
for (int x = 0; x < width; x++)
{
dst[0] = (byte)((src[0] * 10) / 1285);
dst[1] = (byte)((src[1] * 10) / 1285);
dst[2] = (byte)((src[2] * 10) / 1285);
dst[3] = (byte)((src[3] * 10) / 1285);
src += 4;
dst += 4;
}
}
break;
}
}
catch (OutOfMemoryException)
{
return(PSError.memFullErr);
}
return(PSError.noErr);
}
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 && destination->depth != 16)
{
return(PSError.errUnsupportedDepth);
}
// The offsets must be aligned to a System.Byte.
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.Gray || 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;
bool isSelection = channel == PSConstants.ChannelPorts.SelectionMask;
SurfaceBase source = filterImageProvider.Source;
if ((source.BitsPerChannel == 8 || isSelection) && destination->depth == 16)
{
return(PSError.errUnsupportedDepthConversion); // converting 8-bit image data to 16-bit is not supported.
}
if (isSelection)
{
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;
}
try
{
scaledSelectionMask = new SurfaceGray8(dstWidth, dstHeight);
scaledSelectionMask.FitSurface(filterImageProvider.Mask);
}
catch (OutOfMemoryException)
{
return(PSError.memFullErr);
}
}
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;
}
try
{
scaledSelectionMask = new SurfaceGray8(dstWidth, dstHeight);
scaledSelectionMask.FitSurface(filterImageProvider.Mask);
}
catch (OutOfMemoryException)
{
return(PSError.memFullErr);
}
}
FillSelectionMask(destination, scaledSelectionMask, dstRect);
}
}
else
{
ImageModes mode = imageMode;
if (source.BitsPerChannel == 16 && destination->depth == 8)
{
if (ditheredChannelSurface == null)
{
short err = CreateDitheredChannelPortSurface(source);
if (err != PSError.noErr)
{
return(err);
}
}
mode = ditheredChannelImageMode;
}
if (srcWidth == dstWidth && srcHeight == dstHeight)
{
FillChannelData(channel, destination, ditheredChannelSurface ?? source, srcRect, mode);
}
else if (dstWidth < srcWidth || dstHeight < srcHeight) // scale down
{
if ((scaledChannelSurface == null) || scaledChannelSurface.Width != dstWidth || scaledChannelSurface.Height != dstHeight)
{
if (scaledChannelSurface != null)
{
scaledChannelSurface.Dispose();
scaledChannelSurface = null;
}
try
{
scaledChannelSurface = SurfaceFactory.CreateFromImageMode(dstWidth, dstHeight, mode);
scaledChannelSurface.FitSurface(ditheredChannelSurface ?? source);
}
catch (OutOfMemoryException)
{
return(PSError.memFullErr);
}
}
FillChannelData(channel, destination, scaledChannelSurface, dstRect, mode);
}
else if (dstWidth > srcWidth || dstHeight > srcHeight) // scale up
{
if ((scaledChannelSurface == null) || scaledChannelSurface.Width != dstWidth || scaledChannelSurface.Height != dstHeight)
{
if (scaledChannelSurface != null)
{
scaledChannelSurface.Dispose();
scaledChannelSurface = null;
}
try
{
scaledChannelSurface = SurfaceFactory.CreateFromImageMode(dstWidth, dstHeight, mode);
scaledChannelSurface.FitSurface(ditheredChannelSurface ?? source);
}
catch (OutOfMemoryException)
{
return(PSError.memFullErr);
}
}
FillChannelData(channel, destination, scaledChannelSurface, dstRect, mode);
}
}
if (wroteRect != null)
{
*wroteRect = dstRect;
}
return(PSError.noErr);
}