GP<JB2Image>
erode8(const JB2Image *im)
{
int i;
GP<JB2Image> newim = JB2Image::create();
newim->set_dimension(im->get_width(),im->get_height());
for(i=0; i<im->get_shape_count(); i++)
{
const JB2Shape &shape = im->get_shape(i);
JB2Shape newshape;
newshape.parent = shape.parent;
if (shape.bits)
newshape.bits = erode8(shape.bits);
else
newshape.bits = 0;
newim->add_shape(newshape);
}
for(i=0; i<im->get_blit_count(); i++)
{
const JB2Blit* blit = im->get_blit(i);
JB2Blit newblit;
newblit.bottom = blit->bottom + 1;
newblit.left = blit->left + 1;
newblit.shapeno = blit->shapeno;
newim->add_blit(newblit);
}
return newim;
}
// -- Creates a JB2Image with the remaining components
GP<JB2Image>
CCImage::get_jb2image() const
{
GP<JB2Image> jimg = JB2Image::create();
jimg->set_dimension(width, height);
if (runs.hbound() < 0)
return jimg;
if (ccs.hbound() < 0)
G_THROW("Must first perform a cc analysis");
// Iterate over CCs
for (int ccid=0; ccid<=ccs.hbound(); ccid++)
{
JB2Shape shape;
JB2Blit blit;
shape.parent = -1;
shape.bits = get_bitmap_for_cc(ccid);
shape.userdata = 0;
if (ccid >= nregularccs)
shape.userdata |= JB2SHAPE_SPECIAL;
blit.shapeno = jimg->add_shape(shape);
blit.left = ccs[ccid].bb.xmin;
blit.bottom = ccs[ccid].bb.ymin;
jimg->add_blit(blit);
shape.bits->compress();
}
// Return
return jimg;
}
GP<JB2Image>
MMRDecoder::decode(GP<ByteStream> gbs)
{
ByteStream &inp=*gbs;
// Read header
int width, height, invert;
const bool striped=decode_header(inp, width, height, invert);
// Prepare image
GP<JB2Image> jimg = JB2Image::create();
jimg->set_dimension(width, height);
// Choose pertinent blocksize
int blocksize = MIN(500,MAX(64,MAX(width/17,height/22)));
int blocksperline = (width+blocksize-1)/blocksize;
// Prepare decoder
GP<MMRDecoder> gdcd=MMRDecoder::create(gbs, width, height, striped);
MMRDecoder &dcd=*gdcd;
// Loop on JB2 bands
int line = height-1;
while (line >= 0)
{
int bandline = MIN(blocksize-1,line);
GPArray<GBitmap> blocks(0,blocksperline-1);
// Loop on scanlines
for(; bandline >= 0; bandline--,line--)
{
// Decode one scanline
const unsigned short *s = dcd.scanruns();
if (s)
{
// Loop on blocks
int x = 0;
int b = 0;
int firstx = 0;
bool c = !!invert;
while (x < width)
{
int xend = x + *s++;
while (b<blocksperline)
{
int lastx = MIN(firstx+blocksize,width);
if (c)
{
if (!blocks[b])
blocks[b] = GBitmap::create(bandline+1, lastx-firstx);
unsigned char *bptr = (*blocks[b])[bandline] - firstx;
int x1 = MAX(x,firstx);
int x2 = MIN(xend,lastx);
while (x1 < x2)
bptr[x1++] = 1;
}
if (xend < lastx)
break;
firstx = lastx;
b ++;
}
x = xend;
c = !c;
}
}
}
// Insert blocks into JB2Image
for (int b=0; b<blocksperline; b++)
{
JB2Shape shape;
shape.bits = blocks[b];
if (shape.bits)
{
shape.parent = -1;
shape.bits->compress();
JB2Blit blit;
blit.left = b*blocksize;
blit.bottom = line+1;
blit.shapeno = jimg->add_shape(shape);
jimg->add_blit(blit);
}
}
}
// Return
return jimg;
}
