/// <summary>
/// Gets the foreground image for the page
/// </summary>
/// <param name="resizeToPage"></param>
/// <returns></returns>
internal System.Drawing.Bitmap GetForegroundImage(int subsample, bool resizeImage = false)
{
Verify.SubsampleRange(subsample);
lock (_LoadingLock)
{
Bitmap result = null;
JB2Image jb2image = null;
var iwPixelMap = _Page.ForegroundIWPixelMap;
if (iwPixelMap != null)
{
result = _Page.ForegroundIWPixelMap.GetPixelMap().ToImage();
}
else if ((jb2image = _Page.ForegroundJB2Image) != null)
{
result = jb2image.GetBitmap().ToImage();
}
else if (iwPixelMap == null && jb2image == null)
{
result = DjvuImage.CreateBlankImage(Brushes.Black, _Page.Width / subsample, _Page.Height / subsample);
}
return(resizeImage == true?DjvuImage.ResizeImage(result, _Page.Width / subsample, _Page.Height / subsample) : result);
}
}
/// <summary>
/// Extracts a thumbnail image for the page
/// </summary>
/// <returns></returns>
public Bitmap ExtractThumbnailImage()
{
if (_Page.Thumbnail != null)
{
return(_Page.Thumbnail.Image.ToImage());
}
Bitmap result = BuildImage();
var scaleAmount = (double)128 / result.Width;
return(DjvuImage.ResizeImage(result, (int)(result.Width * scaleAmount), (int)(result.Height * scaleAmount)));
}
/// <summary>
/// Gets the background image for the page
/// </summary>
/// <returns></returns>
internal System.Drawing.Bitmap GetBackgroundImage(int subsample, bool resizeImage = false)
{
Verify.SubsampleRange(subsample);
int width = _Page.Width;
int height = _Page.Height;
BG44Chunk[] backgrounds = _Page.PageForm?.GetChildrenItems <BG44Chunk>();
if ((backgrounds == null || backgrounds.Length == 0) && width > 0 && height > 0)
{
return(DjvuImage.CreateBlankImage(Brushes.White, width, height));
}
// Get the composite background image
Wavelet.IInterWavePixelMap backgroundMap = null;
lock (LoadingLock)
{
foreach (BG44Chunk background in backgrounds)
{
if (backgroundMap == null)
{
// Get the initial image
backgroundMap = background.BackgroundImage;
}
else
{
if (!IsBackgroundDecoded)
{
background.ProgressiveDecodeBackground(backgroundMap);
}
}
}
IsBackgroundDecoded = true;
}
Bitmap result = backgroundMap.GetPixelMap().ToImage();
if (resizeImage)
{
int newWidth = width / subsample;
int newHeight = height / subsample;
return(DjvuImage.ResizeImage(result, newWidth, newHeight));
}
else
{
return(result);
}
}
internal System.Drawing.Bitmap GetMaskImage(int subsample, bool resizeImage = false)
{
Verify.SubsampleRange(subsample);
if (_Page.ForegroundJB2Image == null)
{
return(new System.Drawing.Bitmap(_Page.Width / subsample, _Page.Height / subsample, PixelFormat.Format8bppIndexed));
}
lock (LoadingLock)
{
Bitmap result = _Page.ForegroundJB2Image.GetBitmap(subsample, GBitmap.BorderSize).ToImage();
return(resizeImage ? DjvuImage.ResizeImage(result, _Page.Width / subsample, _Page.Height / subsample) : result);
}
}
internal System.Drawing.Bitmap GetTextImage(int subsample, bool resizeImage = false)
{
Verify.SubsampleRange(subsample);
if (_Page.ForegroundJB2Image == null)
{
return(new System.Drawing.Bitmap(_Page.Width / subsample, _Page.Height / subsample));
}
lock (_LoadingLock)
{
var result = _Page.ForegroundJB2Image.GetBitmap(subsample, 4).ToImage();
return(resizeImage ? DjvuImage.ResizeImage(result, _Page.Width / subsample, _Page.Height / subsample) : result);
}
}
/// <summary>
/// Resizes the pages image to the new dimensions
/// </summary>
/// <param name="srcImage"></param>
/// <param name="newWidth"></param>
/// <param name="newHeight"></param>
/// <returns></returns>
public System.Drawing.Bitmap ResizeImage(int newWidth, int newHeight)
{
return(DjvuImage.ResizeImage(Image, newWidth, newHeight));
}
