private int DisplayPreClose(IntPtr handle, IntPtr device)
{
try
{
ClearProgressiveImage();
}
catch (Exception e)
{
StdErr.Append(e);
return(Native.gs_error_Fatal);
}
return(0);
}
private int DisplayPreSize(IntPtr handle, IntPtr device, int width, int height, int raster, uint format)
{
try
{
ClearProgressiveImage();
}
catch (Exception e)
{
StdErr.Append(e);
return(Native.gs_error_Fatal);
}
return(0);
}
private int DisplaySize(IntPtr handle, IntPtr device, int width, int height, int raster, uint format, IntPtr pimage)
{
try
{
// create the new source image
_temporaryImage = new Bitmap(width, height, raster, PixelFormat.Format32bppRgb, pimage)
{
Tag = true
};
// notify the update listeners
Update?.Invoke(this, new GhostscriptRendererEventArgs(_temporaryImage));
}
catch (Exception e)
{
StdErr.Append(e);
return(Native.gs_error_Fatal);
}
return(0);
}
private int DisplayUpdate(IntPtr handle, IntPtr device, int x, int y, int width, int height)
{
// ensure there are listeners and an image
var update = Update;
if (update != null && _temporaryImage != null)
{
try
{
if (!(bool)_temporaryImage.Tag)
{
_temporaryImage.Tag = true;
update(this, new GhostscriptRendererEventArgs(_temporaryImage));
}
}
catch (Exception e)
{
StdErr.Append(e);
return(Native.gs_error_Fatal);
}
}
return(0);
}
private int DisplayPage(IntPtr handle, IntPtr device, int copies, int flush)
{
// return an error if display_size has not been called yet
if (_temporaryImage == null)
{
return(Native.gs_error_undefinedresult);
}
// notify the page handler if any
var page = Page;
if (page != null)
{
try
{
// store the resulting image
Bitmap image;
lock (_temporaryImage)
{
var rect = new Rectangle(Point.Empty, _temporaryImage.Size);
image = new Bitmap(rect.Width, rect.Height, PixelFormat.Format24bppRgb);
using (var gc = Graphics.FromImage(image))
{
gc.DrawImage(_temporaryImage, rect, rect, GraphicsUnit.Pixel);
}
image = new Bitmap(_temporaryImage);
}
page(this, new GhostscriptRendererEventArgs(image));
}
catch (Exception e)
{
StdErr.Append(e);
return(Native.gs_error_Fatal);
}
}
return(0);
}
