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|
# include "bitmapConfig.h"
# include "bmintern.h"
# include <string.h>
# include <appDebugon.h>
/************************************************************************/
/* */
/* Binary morphology operations. */
/* */
/************************************************************************/
typedef struct DilateJob
{
BitmapDescription djBdOut;
unsigned char * djBufOut;
unsigned char djInvertMaskSel;
const BitmapDescription * djBdSel;
const unsigned char * djBufSel;
int djRowSelOrig;
int djColSelOrig;
} DilateJob;
static void bmMorphoDilatePixel( void * voiddj,
int rowIn,
int colIn )
{
DilateJob * dj= (DilateJob *)voiddj;
bmDraw1BitImage( &(dj->djBdOut), dj->djBufOut,
dj->djBdSel, dj->djBufSel,
dj->djInvertMaskSel,
rowIn- dj->djRowSelOrig,
colIn- dj->djColSelOrig );
return;
}
/************************************************************************/
/* */
/* Check the input of a morphology operation. */
/* */
/* 1) Check the format of the input image. */
/* 2) Check the format of the structuring element. */
/* */
/************************************************************************/
static int bmMorphoCheckInputFormats( const BitmapDescription * bdIn,
const BitmapDescription * bdSel )
{
/* 1 */
switch( bdIn->bdColorEncoding )
{
case BMcoBLACKWHITE:
case BMcoWHITEBLACK:
if ( bdIn->bdBitsPerPixel != 1 )
{
LLDEB(bdIn->bdColorEncoding,bdIn->bdBitsPerPixel);
return -1;
}
break;
default:
LLDEB(bdIn->bdColorEncoding,bdIn->bdBitsPerPixel);
return -1;
}
/* 2 */
if ( bdSel->bdColorEncoding != bdIn->bdColorEncoding )
{
LLDEB(bdSel->bdColorEncoding,bdIn->bdColorEncoding);
return -1;
}
if ( bdSel->bdBitsPerPixel != 1 )
{
LLDEB(bdSel->bdColorEncoding,bdSel->bdBitsPerPixel);
return -1;
}
return 0;
}
/************************************************************************/
/* */
/* Remember what to do. */
/* */
/************************************************************************/
static void bmMorphoStartDilateJob(
DilateJob * dj,
const BitmapDescription * bdSel,
const unsigned char * bufSel,
int rowOrig,
int colOrig )
{
bmInitDescription( &(dj->djBdOut) );
dj->djBufOut= (unsigned char *)0;
dj->djInvertMaskSel= 0x00;
dj->djBdSel= bdSel;
dj->djBufSel= bufSel;
dj->djRowSelOrig= rowOrig;
dj->djColSelOrig= colOrig;
return;
}
/************************************************************************/
/* */
/* Dilate an image. */
/* */
/* As a completely arbitrary decision, the '1' value in both the */
/* input and the output have been chosen as the 'black' value of the */
/* morphology books. In the most common WHITEBLACK case of bitmaps, */
/* this means that the colors are swapped. */
/* */
/* 1) Allocate output resources. */
/* 2) Determine the mask to ignore the trailing bits in the input */
/* image. */
/* 3) Dilate the individual rows. */
/* */
/************************************************************************/
static int bmMorphoDilateLow( DilateJob * dj,
BitmapDescription * bdOut,
const BitmapDescription * bdIn,
unsigned char ** pBufOut,
const unsigned char * bufIn,
unsigned char invertMaskIn )
{
int rval= 0;
/* 1 */
if ( bmCopyDescription( &(dj->djBdOut), bdIn ) )
{ LDEB(1); rval= -1; goto ready; }
dj->djBufOut= malloc( dj->djBdOut.bdBufferLength+ 1 );
if ( ! dj->djBufOut )
{
LXDEB(dj->djBdOut.bdBufferLength,dj->djBufOut);
rval= -1; goto ready;
}
# if PARANOIA
bdSelPara= bdSel;
bdOutPara= &dj->djBdOut;
# endif
memset( dj->djBufOut, 0, dj->djBdOut.bdBufferLength+ 1 );
bmForAll1Pixels( bdIn, bufIn, invertMaskIn,
(void *)dj, bmMorphoDilatePixel );
if ( bmCopyDescription( bdOut, &(dj->djBdOut) ) )
{ LDEB(1); rval= -1; goto ready; }
/* steal */
*pBufOut= dj->djBufOut;
dj->djBufOut= (unsigned char *)0;
ready:
if ( dj->djBufOut )
{ free( dj->djBufOut ); }
bmCleanDescription( &(dj->djBdOut) );
return rval;
}
/************************************************************************/
/* */
/* Dilate an image. */
/* */
/************************************************************************/
int bmMorphoDilate( BitmapDescription * bdOut,
const BitmapDescription * bdIn,
unsigned char ** pBufOut,
const unsigned char * bufIn,
const BitmapDescription * bdSel,
const unsigned char * bufSel,
int rowOrig,
int colOrig )
{
const unsigned char invertMaskIn= 0x00;
DilateJob dj;
if ( bmMorphoCheckInputFormats( bdIn, bdSel ) )
{ LDEB(1); return -1; }
bmMorphoStartDilateJob( &dj, bdSel, bufSel, rowOrig, colOrig );
return bmMorphoDilateLow( &dj, bdOut, bdIn, pBufOut, bufIn, invertMaskIn );
}
/************************************************************************/
/* */
/* Erode an image. */
/* */
/* Use the fact that the erosion is the complement of the dilation of */
/* the complement of the input with the mirrored structuring element. */
/* */
/************************************************************************/
int bmMorphoErode( BitmapDescription * bdOut,
const BitmapDescription * bdIn,
unsigned char ** pBufOut,
const unsigned char * bufIn,
const BitmapDescription * bdSel,
const unsigned char * bufSel,
int rowOrig,
int colOrig )
{
int rval= 0;
const unsigned char invertMaskIn= 0xff;
DilateJob dj;
unsigned char * bufRot= (unsigned char *)0;
BitmapDescription bdRot;
int i;
unsigned char * to;
bmInitDescription( &bdRot );
if ( bmMorphoCheckInputFormats( bdIn, bdSel ) )
{ LDEB(1); rval= -1; goto ready; }
if ( bmUpsideDown( &bdRot, bdSel, &bufRot, bufSel, 180 ) )
{ LDEB(180); rval= -1; goto ready; }
bmMorphoStartDilateJob( &dj, &bdRot, bufRot,
bdSel->bdPixelsHigh- rowOrig- 1,
bdSel->bdPixelsWide- colOrig- 1 );
if ( bmMorphoDilateLow( &dj, bdOut, bdIn, pBufOut, bufIn, invertMaskIn ) )
{ XDEB(invertMaskIn); rval= -1; goto ready; }
to= *pBufOut;
for ( i= 0; i < bdOut->bdBufferLength; i++, to++ )
{ to[0]= ~to[0]; }
ready:
if ( bufRot )
{ free( bufRot ); }
bmCleanDescription( &bdRot );
return rval;
}
/************************************************************************/
/* */
/* Return the 'Simple' structuring element. */
/* */
/************************************************************************/
int bmMorphoSetSimpleSe( BitmapDescription * bdOut,
unsigned char ** pBufOut )
{
const int size= 3;
const int wide= size;
const int high= size;
int bytesPerRow;
int bufferLength;
unsigned char * bufOut;
int row;
unsigned char last;
bytesPerRow= ( wide+ 7 )/ 8;
bufferLength= high* bytesPerRow;
bufOut= malloc( bufferLength );
if ( ! bufOut )
{ LXDEB(bufferLength,bufOut); return -1; }
last= 0xff;
if ( wide % 8 )
{ last= ( 0xff << ( 8- wide % 8 ) ) & 0xff; }
for ( row= 0; row < high; row++ )
{
unsigned char * to= bufOut+ row* bytesPerRow;
int byte;
for ( byte= 0; byte < bytesPerRow- 1; to++, byte++ )
{ *to= 0xff; }
*to= last;
}
bmInitDescription( bdOut );
bdOut->bdColorEncoding= BMcoWHITEBLACK;
bdOut->bdPixelsWide= wide;
bdOut->bdPixelsHigh= high;
bdOut->bdBitsPerSample= 1;
bdOut->bdSamplesPerPixel= 1;
bdOut->bdBitsPerPixel= 1;
bdOut->bdXResolution= 1;
bdOut->bdYResolution= 1;
bdOut->bdUnit= BMunPIXEL;
bdOut->bdColorEncoding= BMcoWHITEBLACK;
bdOut->bdBytesPerRow= bytesPerRow;
bdOut->bdBufferLength= bufferLength;
*pBufOut= bufOut;
return 0;
}
/************************************************************************/
/* */
/* Dilate/Erode an image using the 'Simple' structuring element. */
/* */
/* For Erosion, use the approach of bmMorphoErode(), but with some */
/* shortcuts to avoid double work. */
/* */
/************************************************************************/
int bmMorphoDilateSimple( BitmapDescription * bdOut,
const BitmapDescription * bdIn,
unsigned char ** pBufOut,
const unsigned char * bufIn,
int ignoredInt )
{
int rval= 0;
BitmapDescription bdSel;
unsigned char * bufSel= (unsigned char *)0;
const int rowOrig= 1;
const int colOrig= 1;
bmInitDescription( &bdSel );
if ( bmMorphoSetSimpleSe( &bdSel, &bufSel ) )
{ LDEB(1); rval= -1; goto ready; }
if ( bmMorphoDilate( bdOut, bdIn, pBufOut, bufIn,
&bdSel, bufSel, rowOrig, colOrig ) )
{ LLDEB(rowOrig,colOrig); rval= -1; goto ready; }
ready:
if ( bufSel )
{ free( bufSel ); }
bmCleanDescription( &bdSel );
return rval;
}
int bmMorphoErodeSimple( BitmapDescription * bdOut,
const BitmapDescription * bdIn,
unsigned char ** pBufOut,
const unsigned char * bufIn,
int ignoredInt )
{
int rval= 0;
const unsigned char invertMaskIn= 0xff;
DilateJob dj;
BitmapDescription bdSel;
unsigned char * bufSel= (unsigned char *)0;
const int rowOrig= 1;
const int colOrig= 1;
int i;
unsigned char * to;
bmInitDescription( &bdSel );
if ( bmMorphoSetSimpleSe( &bdSel, &bufSel ) )
{ LDEB(1); rval= -1; goto ready; }
if ( bmMorphoCheckInputFormats( bdIn, &bdSel ) )
{ LDEB(1); rval= -1; goto ready; }
bmMorphoStartDilateJob( &dj, &bdSel, bufSel, rowOrig, colOrig );
if ( bmMorphoDilateLow( &dj, bdOut, bdIn, pBufOut, bufIn, invertMaskIn ) )
{ XDEB(invertMaskIn); rval= -1; goto ready; }
to= *pBufOut;
for ( i= 0; i < bdOut->bdBufferLength; i++, to++ )
{ to[0]= ~to[0]; }
ready:
if ( bufSel )
{ free( bufSel ); }
bmCleanDescription( &bdSel );
return rval;
}
/************************************************************************/
/* */
/* Make an element to recognize lines. */
/* */
/************************************************************************/
int bmMorphoLineElement( BitmapDescription * bdOut,
unsigned char ** pBufOut,
int wide,
int high,
int x0,
int y0,
int x1,
int y1 )
{
int bytesPerRow;
int bufferLength;
unsigned char * bufOut;
if ( x0 < 0 || x0 >= wide )
{ LLDEB(x0,wide); return -1; }
if ( x1 < 0 || x1 >= wide )
{ LLDEB(x1,wide); return -1; }
if ( y0 < 0 || y0 >= high )
{ LLDEB(y0,high); return -1; }
if ( y1 < 0 || y1 >= high )
{ LLDEB(y1,high); return -1; }
bytesPerRow= ( wide+ 7 )/ 8;
bufferLength= high* bytesPerRow;
bufOut= malloc( bufferLength );
if ( ! bufOut )
{ LXDEB(bufferLength,bufOut); return -1; }
bmInitDescription( bdOut );
bdOut->bdColorEncoding= BMcoWHITEBLACK;
bdOut->bdPixelsWide= wide;
bdOut->bdPixelsHigh= high;
bdOut->bdBitsPerSample= 1;
bdOut->bdSamplesPerPixel= 1;
bdOut->bdBitsPerPixel= 1;
bdOut->bdXResolution= 1;
bdOut->bdYResolution= 1;
bdOut->bdUnit= BMunPIXEL;
bdOut->bdColorEncoding= BMcoWHITEBLACK;
bdOut->bdBytesPerRow= bytesPerRow;
bdOut->bdBufferLength= bufferLength;
memset( bufOut, 0x00, bufferLength );
bmDrawLine( bufOut, bdOut, x0, y0, x1, y1, 1 );
*pBufOut= bufOut;
return 0;
}
|
