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using System;
using System.Collections.Generic;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Runtime.InteropServices;
using GhostNET;
namespace ghostnet_wpf_example
{
public partial class MainWindow
{
private static List<DocPage> m_thumbnails;
/* Assign current pages to blown up thumbnail images */
private void ThumbAssignMain(int page_num, int width, int height, double zoom_in, ref int offset)
{
m_pageType.Add(Page_Content_t.THUMBNAIL);
DocPage doc_page = new DocPage();
doc_page.Content = Page_Content_t.THUMBNAIL;
doc_page.Zoom = zoom_in;
doc_page.AA = m_aa;
doc_page.BitMap = m_thumbnails[page_num - 1].BitMap;
doc_page.Width = (int)(width / (Constants.SCALE_THUMB));
doc_page.Height = (int)(height / (Constants.SCALE_THUMB));
doc_page.PageNum = page_num;
m_docPages.Add(doc_page);
/* Set the page offsets. Used for determining which pages
* will be visible within viewport. */
m_toppage_pos.Add(offset + Constants.PAGE_VERT_MARGIN);
offset += doc_page.Height + 2 * Constants.PAGE_VERT_MARGIN;
/* Set page sizes for 1.0 scaling. This is used to quick
* rescale of pages prior to rendering at new zoom. */
pagesizes_t page_size = new pagesizes_t();
page_size.size.X = doc_page.Width;
page_size.size.Y = doc_page.Height;
m_page_sizes.Add(page_size);
}
/* Rendered all the thumbnail pages. Stick them in the appropriate lists */
private void ThumbsDone()
{
int offset = 0;
m_toppage_pos = new List<int>(m_list_thumb.Count);
for (int k = 0; k < m_list_thumb.Count; k++)
{
DocPage doc_page = new DocPage();
m_thumbnails.Add(doc_page);
doc_page.Width = m_list_thumb[k].width;
doc_page.Height = m_list_thumb[k].height;
doc_page.Content = Page_Content_t.THUMBNAIL;
doc_page.Zoom = m_list_thumb[k].zoom;
doc_page.BitMap = BitmapSource.Create(doc_page.Width, doc_page.Height,
72, 72, PixelFormats.Bgr24, BitmapPalettes.Halftone256, m_list_thumb[k].bitmap, m_list_thumb[k].raster);
doc_page.PageNum = m_list_thumb[k].page_num;
ThumbAssignMain(m_list_thumb[k].page_num, m_list_thumb[k].width, m_list_thumb[k].height, 1.0, ref offset);
}
m_toppage_pos.Add(offset);
xaml_ProgressGrid.Visibility = System.Windows.Visibility.Collapsed;
xaml_RenderProgress.Value = 0;
xaml_PageList.ItemsSource = m_docPages;
xaml_ThumbList.ItemsSource = m_thumbnails;
xaml_ThumbList.Items.Refresh();
xaml_ThumbGrid.Visibility = System.Windows.Visibility.Visible;
m_ghostscript.gsPageRenderedMain -= new ghostsharp.gsCallBackPageRenderedMain(gsThumbRendered);
m_numpages = m_list_thumb.Count;
if (m_numpages < 1)
{
ShowMessage(NotifyType_t.MESS_STATUS, "File failed to open properly");
CleanUp();
}
else
{
xaml_TotalPages.Text = "/" + m_numpages;
xaml_currPage.Text = m_currpage.ToString();
m_list_thumb.Clear();
if (m_doc_type_has_page_access)
RenderMainRange();
else
RenderMainAll();
}
}
/* Callback from ghostscript with the rendered thumbnail. Also update progress */
private void ThumbPageCallback(int width, int height, int raster, double zoom_in,
int page_num, IntPtr data)
{
Byte[] bitmap = new byte[raster * height];
idata_t thumb = new idata_t();
Marshal.Copy(data, bitmap, 0, raster * height);
thumb.bitmap = bitmap;
thumb.page_num = page_num;
thumb.width = width;
thumb.height = height;
thumb.raster = raster;
thumb.zoom = zoom_in;
m_list_thumb.Add(thumb);
/* Dispatch progress bar update on UI thread */
System.Windows.Application.Current.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Send, new Action(() =>
{
/* Logrithmic but it will show progress */
xaml_RenderProgress.Value = ((double) page_num / ((double) page_num + 1))* 100.0;
}));
}
/* Render the thumbnail images */
private void RenderThumbs()
{
xaml_RenderProgress.Value = 0;
xaml_RenderProgressText.Text = "Creating Thumbs";
xaml_ProgressGrid.Visibility = System.Windows.Visibility.Visible;
m_ghostscript.gsPageRenderedMain += new ghostsharp.gsCallBackPageRenderedMain(gsThumbRendered);
m_ghostscript.gsDisplayDeviceRenderThumbs(m_currfile, Constants.SCALE_THUMB, false, GS_Task_t.DISPLAY_DEV_THUMBS);
}
}
}
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