/// <summary>
/// Progressively decodes the background image
/// </summary>
/// <param name="backgroundMap"></param>
public IWPixelMap ProgressiveDecodeBackground(IWPixelMap backgroundMap)
{
using (DjvuReader reader = Reader.CloneReader(_dataLocation, Length))
{
backgroundMap.Decode(reader);
}
return(backgroundMap);
}
/// <summary>
/// Decodes the thumbnail image for this chunk
/// </summary>
/// <returns></returns>
private IWPixelMap DecodeThumbnailImage()
{
using (DjvuReader reader = Reader.CloneReader(_dataLocation, Length))
{
IWPixelMap thumbnail = new IWPixelMap();
thumbnail.Decode(reader);
return(thumbnail);
}
}
/// <summary>
/// Decodes the background image for this chunk
/// </summary>
/// <returns></returns>
private IWPixelMap DecodeBackgroundImage()
{
using (DjvuReader reader = Reader.CloneReader(_dataLocation, Length))
{
IWPixelMap background = new IWPixelMap();
background.Decode(reader);
return(background);
}
}
private bool IsLegalCompound()
{
if (Info == null)
{
return(false);
}
int width = Info.Width;
int height = Info.Height;
if ((width <= 0) || (height <= 0))
{
return(false);
}
JB2Image fgJb2 = ForegroundJB2Image;
if ((fgJb2 == null) || (fgJb2.Width != width) || (fgJb2.Height != height))
{
return(false);
}
// There is no need to synchronize since we won't access data which could be updated.
IWPixelMap bgIWPixmap = (IWPixelMap)BackgroundIWPixelMap;
int bgred = 0;
if (bgIWPixmap != null)
{
bgred =
ComputeRed(
width,
height,
bgIWPixmap.Width,
bgIWPixmap.Height);
}
if ((bgred < 1) || (bgred > 12))
{
return(false);
}
int fgred = 0;
if (ForegroundIWPixelMap != null)
{
GPixmap fgPixmap = ForegroundPixelMap;
fgred = ComputeRed(
width,
height,
fgPixmap.ImageWidth,
fgPixmap.ImageHeight);
}
return((fgred >= 1) && (fgred <= 12));
}
/// <summary>
/// Gets the background pixmap
/// </summary>
/// <param name="rect"></param>
/// <param name="subSample"></param>
/// <param name="gamma"></param>
/// <param name="retval"></param>
/// <returns></returns>
public GPixmap GetBgPixmap(GRect rect, int subsample, double gamma, GPixmap retval)
{
GPixmap pm = null;
int width = (Info == null)
? 0
: Info.Width;
int height = (Info == null)
? 0
: Info.Height;
if ((width <= 0) || (height <= 0) || (Info == null))
{
return(null);
}
double gamma_correction = 1.0D;
if ((gamma > 0.0D) && (Info != null))
{
gamma_correction = gamma / Info.Gamma;
}
if (gamma_correction < 0.10000000000000001D)
{
gamma_correction = 0.10000000000000001D;
}
else if (gamma_correction > 10D)
{
gamma_correction = 10D;
}
IWPixelMap bgIWPixmap = BackgroundIWPixelMap;
if (bgIWPixmap != null)
{
int w = bgIWPixmap.Width;
int h = bgIWPixmap.Height;
if ((w == 0) || (h == 0) || (width == 0) || (height == 0))
{
return(null);
}
int red = ComputeRed(width, height, w, h);
if ((red < 1) || (red > 12))
{
return(null);
}
if (subsample == red)
{
pm = bgIWPixmap.GetPixmap(1, rect, retval);
}
else if (subsample == (2 * red))
{
pm = bgIWPixmap.GetPixmap(2, rect, retval);
}
else if (subsample == (4 * red))
{
pm = bgIWPixmap.GetPixmap(4, rect, retval);
}
else if (subsample == (8 * red))
{
pm = bgIWPixmap.GetPixmap(8, rect, retval);
}
else if ((red * 4) == (subsample * 3))
{
GRect xrect = new GRect();
xrect.Right = (int)Math.Floor(rect.Right * 4D / 3D);
xrect.Bottom = (int)Math.Floor(rect.Bottom * 4D / 3D);
xrect.Left = (int)Math.Ceiling((double)rect.Left * 4D / 3D);
xrect.Top = (int)Math.Ceiling((double)rect.Top * 4D / 3D);
GRect nrect = new GRect(0, 0, rect.Width, rect.Height);
if (xrect.Left > w)
{
xrect.Left = w;
}
if (xrect.Top > h)
{
xrect.Top = h;
}
GPixmap ipm = bgIWPixmap.GetPixmap(1, xrect, null);
pm = (retval != null)
? retval
: new GPixmap();
pm.Downsample43(ipm, nrect);
}
else
{
int po2 = 16;
while ((po2 > 1) && (subsample < (po2 * red)))
{
po2 >>= 1;
}
int inw = ((w + po2) - 1) / po2;
int inh = ((h + po2) - 1) / po2;
int outw = ((width + subsample) - 1) / subsample;
int outh = ((height + subsample) - 1) / subsample;
PixelMapScaler ps = new PixelMapScaler(inw, inh, outw, outh);
ps.SetHorzRatio(red * po2, subsample);
ps.SetVertRatio(red * po2, subsample);
GRect xrect = ps.GetRequiredRect(rect);
GPixmap ipm = bgIWPixmap.GetPixmap(po2, xrect, null);
pm = (retval != null)
? retval
: new GPixmap();
ps.Scale(xrect, ipm, rect, pm);
}
if ((pm != null) && (gamma_correction != 1.0D))
{
pm.ApplyGammaCorrection(gamma_correction);
for (int i = 0; i < 9; i++)
{
pm.ApplyGammaCorrection(gamma_correction);
}
}
return(pm);
}
else
{
return(null);
}
}
private bool Stencil(PixelMap pm, Graphics.Rectangle rect, int subsample, double gamma)
{
if (Info == null)
{
return(false);
}
int width = Info.Width;
int height = Info.Height;
if ((width <= 0) || (height <= 0))
{
return(false);
}
double gamma_correction = 1.0D;
if (gamma > 0.0D)
{
gamma_correction = gamma / Info.Gamma;
}
if (gamma_correction < 0.10000000000000001D)
{
gamma_correction = 0.10000000000000001D;
}
else if (gamma_correction > 10D)
{
gamma_correction = 10D;
}
JB2Image fgJb2 = ForegroundJB2Image;
if (fgJb2 != null)
{
ColorPalette fgPalette = ForegroundPalette;
if (fgPalette != null)
{
List <int> components = new List <int>();
GBitmap bm = GetBitmapList(rect, subsample, 1, components);
if (fgJb2.Blits.Count != fgPalette.BlitColors.Length)
{
pm.Attenuate(bm, 0, 0);
return(false);
}
GPixmap colors =
new GPixmap().Init(
1,
fgPalette.PaletteColors.Length,
null);
GPixelReference color = colors.CreateGPixelReference(0);
for (int i = 0; i < colors.ImageWidth; color.IncOffset())
{
fgPalette.index_to_color(i++, color);
}
colors.ApplyGammaCorrection(gamma_correction);
List <int> compset = new List <int>();
while (components.Count > 0)
{
int lastx = 0;
int colorindex = fgPalette.BlitColors[((int)components[0])];
GRect comprect = new GRect();
compset = new List <int>();
for (int pos = 0; pos < components.Count;)
{
int blitno = ((int)components[pos]);
JB2Blit pblit = fgJb2.Blits[blitno];
if (pblit.Left < lastx)
{
break;
}
lastx = pblit.Left;
if (fgPalette.BlitColors[blitno] == colorindex)
{
JB2Shape pshape = fgJb2.GetShape(pblit.ShapeNumber);
GRect xrect =
new GRect(
pblit.Left,
pblit.Bottom,
pshape.Bitmap.ImageWidth,
pshape.Bitmap.ImageHeight);
comprect.Recthull(comprect, xrect);
compset.Add(components[pos]);
components.Remove(pos);
}
else
{
pos++;
}
}
comprect.XMin /= subsample;
comprect.YMin /= subsample;
comprect.XMax = ((comprect.XMax + subsample) - 1) / subsample;
comprect.YMax = ((comprect.YMax + subsample) - 1) / subsample;
comprect.Intersect(comprect, rect);
if (comprect.Empty)
{
continue;
}
// bm = getBitmap(comprect, subsample, 1);
bm = new GBitmap();
bm.Init(
comprect.Height,
comprect.Width,
0);
bm.Grays = 1 + (subsample * subsample);
int rxmin = comprect.XMin * subsample;
int rymin = comprect.YMin * subsample;
for (int pos = 0; pos < compset.Count; ++pos)
{
int blitno = ((int)compset[pos]);
JB2Blit pblit = fgJb2.Blits[blitno];
JB2Shape pshape = fgJb2.GetShape(pblit.ShapeNumber);
bm.Blit(
pshape.Bitmap,
pblit.Left - rxmin,
pblit.Bottom - rymin,
subsample);
}
color.SetOffset(colorindex);
pm.Blit(
bm,
comprect.XMin - rect.XMin,
comprect.YMin - rect.YMin,
color);
}
return(true);
}
// Three layer model.
IWPixelMap fgIWPixmap = ForegroundIWPixelMap;
if (fgIWPixmap != null)
{
GBitmap bm = GetBitmap(rect, subsample, 1, null);
if ((bm != null) && (pm != null))
{
GPixmap fgPixmap = ForegroundPixelMap;
int w = fgPixmap.ImageWidth;
int h = fgPixmap.ImageHeight;
int red = ComputeRed(width, height, w, h);
// if((red < 1) || (red > 12))
if ((red < 1) || (red > 16))
{
return(false);
}
//
// int supersample = (red <= subsample)
// ? 1
// : (red / subsample);
// int wantedred = supersample * subsample;
//
// if(red == wantedred)
// {
// pm.stencil(bm, fgPixmap, supersample, rect, gamma_correction);
//
// return 1;
// }
pm.Stencil(bm, fgPixmap, red, subsample, rect, gamma_correction);
return(true);
}
}
}
return(false);
}
