示例#1
0
文件: seek_slider.c 项目: d3x0r/SACK
static void OnSaveControl( CONTROL_NAME )( FILE *file,uintptr_t psv )
{
	PSLIDER_INFO info = (PSLIDER_INFO)psv;
	sack_fprintf( file, "Seek Slider color=$%02X%02X%02X%02X\n"
			 , AlphaVal( info->color )
			 , RedVal( info->color )
			 , GreenVal( info->color )
			 , BlueVal( info->color )
			 );
	sack_fprintf( file, "Seek Slider back color=$%02X%02X%02X%02X\n"
			 , AlphaVal( info->backcolor )
			 , RedVal( info->backcolor )
			 , GreenVal( info->backcolor )
			 , BlueVal( info->backcolor )
			 );
	sack_fprintf( file, "Seek Slider background image=%s\n", info->image_name?info->image_name:"" );
	sack_fprintf( file, "Seek Slider is horizontal?%s\n", info->flags.bHorizontal?"Yes":"No" );
	sack_fprintf( file, "Seek Slider is draggable?%s\n", info->flags.bDragging?"Yes":"No" );
	sack_fprintf( file, "Seek Slider min value=%d\n", info->min);
	sack_fprintf( file, "Seek Slider max value=%d\n", info->max);
	sack_fprintf( file, "Seek Slider current value=%d\n", info->current);


	InterShell_SaveCommonButtonParameters( file );

}
示例#2
0
IMAGE_NAMESPACE

#define SET_POINTS(a,b,c,d,e,f) {    \
	if( a==d ) points[0].flags.samepoint=1; else points[0].flags.samepoint=0; \
   points[0].flags.no_left = points[0].flags.no_right = 0; \
	points[0].left.x = x##a;     \
	points[0].left.y= y##a;      \
   points[0].left.vertex_number = a-1; \
	points[0].right.x = x##d;      \
	points[0].right.y= y##d;      \
   points[0].right.vertex_number = d-1; \
	if( b==e ) points[1].flags.samepoint=1; else points[1].flags.samepoint=0; \
   points[1].flags.no_left = points[1].flags.no_right = 0; \
	points[1].left.x = x##b;   \
	points[1].left.y= y##b;   \
   points[1].left.vertex_number = b-1; \
	points[1].right.x = x##e;   \
	points[1].right.y= y##e;   \
   points[1].right.vertex_number = e-1; \
	if( c==f ) points[2].flags.samepoint=1; else points[2].flags.samepoint=0; \
	if( c ) { points[2].left.x = x##c;   \
	          points[2].left.y= y##c;      \
	          points[2].left.vertex_number = c-1; \
	          points[2].flags.no_left = 0;\
	} else points[2].flags.no_left = 1;\
	if( f ) { points[2].right.x = x##f;   \
	          points[2].right.y= y##f;    \
	          points[2].right.vertex_number = f-1; \
	          points[2].flags.no_right = 0;\
	} else points[2].flags.no_right = 1;\
	}

#define SCALE_SHIFT 0

static void PlotArbitrary( Image dest
						, Image source
						, S_32 x1, S_32 y1
						, S_32 x2, S_32 y2
						, S_32 x3, S_32 y3
						, S_32 x4, S_32 y4
						, _32 alpha
						, _32 mode
						, _32 param1
						, _32 param2
						, _32 param3
						)
{
	// x1, y1 define the position of the upper left corner of the image
	// x2, y2 define the position of the corner to the right of the upper left
	// x3, y3 define the position of the corner down from x2, y2
	// x4, y4 define the position left of the corner at x3, y3
	int lines = 0;
   int cols  = 0;
	struct {
		struct {
			int samepoint : 1;
			int no_left : 1;
			int no_right : 1;
		} flags;
		struct {
			S_32 x, y;
			int vertex_number; // 0, 1, 2, 3
		}left;
		struct {
			S_32 x, y;
			int vertex_number; // 0, 1, 2, 3
		} right;
	} points[3];

	struct {
		int x, y;
	} verts[4];

	int x0 = 0;
	int y0 = 0; // needed cause macro isn't the smartest...
#ifdef DEBUG_TIMING
	//lprintf( "-- Begin Setup" );
#endif

   verts[0].x = 0;
   verts[0].y = 0;
   verts[1].x = source->real_width << SCALE_SHIFT;
   verts[1].y = 0;
   verts[2].x = source->real_width << SCALE_SHIFT;
   verts[2].y = source->real_height << SCALE_SHIFT;
   verts[3].x = 0;
	verts[3].y = source->real_height << SCALE_SHIFT;
#ifdef DEBUG_TIMING
	{
		//lprintf( WIDE("points : %d,%d %d,%d %d,%d %d,%d"), x1, y1, x2, y2, x3, y3, x4, y4 );
	}
#endif

	if( y1 < y2 )
	{
		if( y1 < y3 )
		{
			if( y1 < y4 )
			{
				// y1 is the least
				if( ( y3 > y2 ) && ( y3 > y4 ) )
				{
					SET_POINTS( 1, 4, 3, 1, 2, 3 );
				}
				else if( y3 == y2 )
				{
					SET_POINTS( 1, 4, 3, 1, 2, 0 );
				}
				else if( y3 == y4 )
				{
					SET_POINTS( 1, 4, 0, 1, 2, 3 );
				}
				else
				{
					lprintf( WIDE("Invalid configuration ( convex? )") );
				}
			}
			else if( y4 < y1 )
			{
				// y4 is the least
				if( ( y2 > y3 ) && ( y2 > y1 ) )
				{
					SET_POINTS( 4, 3, 2, 4, 1, 2 );
				}
				else if( y2 == y3 )
				{
					SET_POINTS( 4, 3, 0, 4, 1, 2 );
				}
				else if( y2 == y1 )
				{
					SET_POINTS( 4, 3, 2, 4, 1, 0 );
				}
				else if( y3 == y2 )
				{
					SET_POINTS( 4, 3, 0, 4, 1, 2 );
				}
				else if( y2 == y1 )
				{
					SET_POINTS( 4, 3, 2, 4, 1, 0 );
				}
				else
				{
					lprintf( WIDE("Invalid configuration ( convex? )") );
				}

			}
			else // y4 == y1 and these are the least
			{
				if( y2 > y3 )
				{
					SET_POINTS( 4, 3, 2, 1, 2, 0 );
				}
				else if( y3 > y2 )
				{
					SET_POINTS( 4, 3, 0, 1, 2, 3 );
				}
				else
				{
					SET_POINTS( 4, 3, 0, 1, 2, 0 );
				}
			}
		}
		else if( y3 < y1 )
		{
			if( y3 < y4 )
			{
				// y3 is the least
				SET_POINTS( 3, 2, 1, 3, 4, 1 );
				//SET_POINTS( 3, 2, 1, 3,
			}
			else if( y4 < y3 )
			{
				// y4 is the least
				//if( ( y2 > y1 ) && ( y2 > y3 ) )
				SET_POINTS( 4, 3, 2, 4, 1, 2 );
				//else if(
			}
			else
			{
				// y3 and y4 are both least...
				if( y2 == y1 )
				{
					SET_POINTS( 3, 2, 0, 4, 1, 0 );
				}
				else if( y2 > y1 )
				{
					SET_POINTS( 3, 2, 0, 4, 1, 2 );
				}
				else
				{
					SET_POINTS( 3, 2, 1, 4, 1, 0 );
				}
			}
		}
		else // y1 == y3
		{
			if( y2 < y1 )
			{
            SET_POINTS( 2, 3, 4, 2, 1, 4 );
			}
			else if( y4 < y1 )
			{
            SET_POINTS( 2, 3, 4, 2, 1, 4 );
			}
			else
				lprintf( WIDE("Invalid Configuration!") );
		}
	}
	else if( y2 < y1 )
	{
		if( y2 < y3 )
		{
			if( y2 < y4 )
			{
				if( ( y4 > y1 ) && ( y4 > y3 ) )
				{
					SET_POINTS( 2, 1, 4, 2, 3, 4 );
				}
				else if( y4 == y1 )
				{
					SET_POINTS( 2, 1, 0, 2, 3, 4 );
				}
				else if( y4 == y3 )
				{
					SET_POINTS( 2, 1, 4, 2, 3, 0 );
				}
				else
					lprintf( WIDE("Invalid configuration!") );
				// y2 is the least
			}
			else if( y4 <= y2 )
			{
				lprintf( WIDE("Invalid configuration!") );
			}
		}
		else if( y3 < y2 )
		{
			if( y3 == y4 )
			{
            SET_POINTS( 3, 2, 0, 4, 1, 0 );
			}
			else if( ( y1 > y2 ) && ( y1 > y4 ) )
			{
				SET_POINTS( 3, 2, 1, 3, 4, 1 );
			}
			else if( y1 == y2 )
			{
				SET_POINTS( 3, 2, 0, 3, 4, 1 );
			}
			else if( y1 == y4 )
			{
				SET_POINTS( 3, 2, 1, 3, 4, 0 );
			}
			else
				lprintf( WIDE("Invalid configuration!") );
			// y3 is the least
		}
		else //if( y2 == y3 )
		{
			if( y4 > y1 )
			{
				SET_POINTS( 2, 1, 4, 3, 4, 0 );
			}
			else if( y4 < y1 )
			{
				SET_POINTS( 2, 1, 0, 3, 4, 1 );
			}
			else
			{
				SET_POINTS( 2, 1, 0, 3, 4, 0 );

			}
		}
      /*
		else
		{
			// y4 is the least
			if( ( y2 > y3 ) && ( y2 > y1 ) )
			{
				SET_POINTS( 4, 3, 2, 4, 1, 2 );
			}
			else if( y2 == y3 )
			{
				SET_POINTS( 4, 3, 0, 4, 1, 2 );
			}
			else if( y2 == y1 )
			{
				SET_POINTS( 4, 3, 2, 4, 1, 0 );
			}
         else
            lprintf( "Invalid configuration!" );
				}
            */
	}
	else // y1 == y2
	{
		if( y1 < y3 )
		{
			if( y3 > y4 )
			{
				SET_POINTS( 1, 4, 3, 2, 3, 0 );
			}
			else if( y3 < y4 )
			{
				SET_POINTS( 1, 4, 0, 2, 3, 4 );
			}
			else // we're square!
			{
				SET_POINTS( 1, 4, 0, 2, 3, 0 );
			}
		}
		else if( y3 < y1 )
		{
			if( y3 == y4 )
			{
            SET_POINTS( 3,2,0,4,1,0 );
			}
         else
			// y3 is less than both y2 and y1
			if( y3 < y4 )
			{
            SET_POINTS( 3,2,1,3,4,1 );
            // y3 is least
			}
			else if( y4 < y3 )
			{
            SET_POINTS( 4,3,2,4,1,2 );
				// y4 is least
			}

		}
		else
         lprintf( WIDE("Invalid configuration.. y1, y2, and y3 all equal") );
	}

#ifdef DEBUG_TIMING
	//lprintf( "-- End Setup" );
#endif
	{
#ifdef DEBUG_TIMING
		int loops[20];
#endif
		int output = 0;
		struct {
			int idx;
			int curx, cury; // cury is common between left and right.
			struct {
				int x, y;
            int out, image; // delta output vs delta image
			} del;
			int incx, incy;
			int err;
			int err2; // accumulator for delta output vs delta image
			struct {
				int curx, cury;
				struct {
					int x, y;
				} del;
            int incx, incy;
            int err;
			} image;
		} right, left;

		struct {
			int curx, cury; // current pixel on stride from left.image. to right.image.
			struct {
				int x, y;
			} del; // current delta of left.image.current to right.image curre
			int err;
         int incx, incy;
		} image;

		struct {
			// delta of this are from min point to max point
			// and left.curx to right.curx
         // but
			int curx, cury;
			struct {
				int out, image; // except in this case it's
			} del;
         int incout;
         int err;
		} out;

#ifdef DEBUG_TIMING
		for( output = 0; output<20;output++ ) loops[output] = 0;
#endif
		output = 0;
		//out.cury = points[0].left.y;
		left.idx = 0;
		right.idx = 0;

		// need to cover the length of an edge in the Y length of the screen.
		// this is a fixed rule, since we scan always each Y of the screen and the
		// across on each X of the screen.  the X is determined from
		//     left.image.curx, left.image.cury to right.image.curx, right.image.cury
      //     which is spanned in the delta from left.curx to right.curx.

		//--------------------------
		left.curx = points[left.idx].left.x;
		left.cury = points[left.idx].left.y; // really this is common... but for properness I should set it.
		//--------------------------
		right.curx = points[right.idx].right.x;
		right.cury = points[right.idx].right.y; // really this is common... but for properness I should set it.
		//--------------------------
		//lprintf( "..." );
		do
		{
			//if( ( left.cury - points[left.idx-1].left.y ) == 10 )
			//   DebugBreak();
			//lprintf( "Begin line." );
			lines++;
			if( left.idx > 0 )
			{
				out.curx = left.curx;
				out.cury = left.cury;
				out.del.out = right.curx - left.curx;
				if( out.del.out < 0 )
				{
					out.del.out = -out.del.out;
               out.incout = -1;
				}
				else
               out.incout = 1;

				image.curx = left.image.curx;
				image.cury = left.image.cury;

				//--------------------------
				image.del.x = right.image.curx - left.image.curx;
				if( image.del.x < 0 )
				{
					image.del.x = -image.del.x;
					image.incx = -1;
				}
				else
					image.incx = 1;

				//--------------------------
				image.del.y = right.image.cury - left.image.cury;
				if( image.del.y < 0 )
				{
					image.del.y = -image.del.y;
					image.incy = -1;
				}
				else
					image.incy = 1;
				image.err = (-image.del.x)/2;

				//--------------------------
				// this loop iterates the image by one pixel...
				// but I don't really need THIS loop... so what's the next?
				// the iterator of curx's on the image, according to the step of
				// this pixel vs the whole line...
				//printf( "Line: %d  (%d-%d)\n", out.cury, left.image.curx, right.image.curx );
				//if( out.cury == 82 )
				//   DebugBreak();
				if( image.del.x < image.del.y )
				{
					out.del.image = image.del.y;
					{
						out.err = (-out.del.image)/2;
						image.err = (-image.del.y)/2;
						if( out.curx < dest->x )
                     out.curx = dest->x;
						if( right.curx > dest->width )
                     right.curx = dest->width;
						if( out.cury >= dest->y && out.cury < dest->height )
						while( out.curx <= right.curx )
						{
#ifdef DEBUG_TIMING
							loops[0]++;
#endif
						   //if( //( out.curx >= dest->x ) && ( out.curx < (dest->x + dest->width) )
								//( out.cury >= dest->y ) && ( out.cury < (dest->y + dest->height) )
							//  )
							{
								int cx, cy;

#ifdef OUTPUT_IMAGE
								if( ( (cx=image.curx>>SCALE_SHIFT) < source->width ) &&
									( (cy=image.cury>>SCALE_SHIFT) < source->height ) )
								{
									CDATA c = *IMG_ADDRESS( source, cx, cy );
									CDATA *po = IMG_ADDRESS(dest,out.curx,out.cury);
									int alpha1 = AlphaVal(c);
									*po = DOALPHA2( *po, c, alpha1 ) ;
									output++;
								}
#endif
							}
							//plot( dest, out.curx, out.cury
							//	 , getpixel( source, image.curx >> SCALE_SHIFT, image.cury >> SCALE_SHIFT )
								  //, Color( image.curx*4, image.cury*4, 0 )
							//	 );
							out.err += out.del.image;
							out.curx++;
							while( out.curx <= right.curx && out.err > 0 )
							{
#ifdef DEBUG_TIMING
								loops[1]++;
#endif
								out.err -= out.del.out;
								{ // iterate the image one step. (ie out.image++ )
									image.err += image.del.x;
									image.cury += image.incy;
									while( image.err > 0 )
									{
#ifdef DEBUG_TIMING
										loops[2]++;
#endif
										image.err -= image.del.y;
										image.curx += image.incx;
									}
								}
							}
						}
					}
				}
				else
				{
					out.del.image = image.del.x;
					{
						out.err = (-out.del.image)/2;
						image.err = (-image.del.x)/2;
						//lprintf( "plot..." );
						cols = 0;
						if( out.curx < dest->x )
                     out.curx = dest->x;
						if( right.curx > dest->width )
							right.curx = dest->width;
						if( out.cury >= dest->y && out.cury < dest->height )

						while( out.curx <= right.curx )
						{
							int cx, cy; // = image.curx >> SCALE_SHIFT, cy = image.cury >> SCALE_SHIFT;
#ifdef DEBUG_TIMING
							loops[3]++;
#endif
							cols++;
							//printf( "c %d,", image.curx );
						   //if( //( out.curx >= dest->x ) && ( out.curx < (dest->x + dest->width) )
								//&&
								//( out.cury >= dest->y ) && ( out.cury < (dest->y + dest->height) ) )
							{
#if defined( OUTPUT_IMAGE )
								if( ( (cx=image.curx>>SCALE_SHIFT) < source->width ) &&
									( (cy=image.cury>>SCALE_SHIFT) < source->height ) )
								{
									CDATA c;
									CDATA *po;
									int alpha1;
									c = *IMG_ADDRESS( source, cx, cy );
									po = IMG_ADDRESS(dest,out.curx,out.cury);
									alpha1 = AlphaVal(c);
									*po = DOALPHA2( *po, c, alpha1 ) ;
									output++;
								}
#endif
							}
							//plot( dest, out.curx, out.cury
							//	 , getpixel( source, image.curx >> SCALE_SHIFT, image.cury >> SCALE_SHIFT )
								  //, Color( image.curx*4, image.cury*4, 0 )
							//	 );
							out.err += out.del.image;
							out.curx++;
							while( out.curx <= right.curx && out.err > 0 )
							{
#ifdef DEBUG_TIMING
								loops[4]++;
#endif
								out.err -= out.del.out;
								{ // iterate the image one step. (ie out.image++ )
									image.err += image.del.y;
									image.curx += image.incx;
									while( image.err > 0 )
									{
#ifdef DEBUG_TIMING
										loops[5]++;
#endif
										image.err -= image.del.x;
										image.cury += image.incy;
									}
								}
							}
						}
						//lprintf( "end plot... %d", cols );
					}
				}

				//printf( "\n" );
			} // if ( left.idx > 0 )



			//--------------
			// check to see if we need to change the left or right
			// segments...
			if( left.idx )
			{
				//---------------
				// increment output X on left and right side.
				// always step by 1 Y therefore we always add the same del.x...
				//

				{
					// step the output coordinate....
					left.err += left.del.x;
					/* incy will always be 1... perhaps effectively zero...*/
					left.cury += left.incy;
					while( left.err > 0 )
					{
#ifdef DEBUG_TIMING
						loops[6]++;
#endif
						if( !left.del.y )
		                     DebugBreak();
						left.err -= left.del.y;
						left.curx += left.incx;
					}
				}

            // step increment output vs image...
				left.err2 += left.del.image;
				if( left.image.del.x < left.image.del.y )
				{
					while( left.err2 > 0 )
					{
#ifdef DEBUG_TIMING
						loops[7]++;
#endif
						left.err2 -= left.del.out; // the larger distance to go on the line.
						left.image.err += left.image.del.x;
						// increment the longer distance by a unit increment.
						left.image.cury += left.image.incy;
						while( left.image.err > 0 )
						{
#ifdef DEBUG_TIMING
							loops[8]++;
#endif
							left.image.err -= left.del.out;
							left.image.curx += left.image.incx;
							//printf( "," );
						}
					}
				}
				else // left.image.del.x > left.image.del.y
				{
					while( left.err2 > 0 )
					{
#ifdef DEBUG_TIMING
						loops[9]++;
#endif
						left.err2 -= left.del.out; // the larger distance to go on the line.
						left.image.err += left.image.del.y;
						// incement the longer distance by a unit distance.
						left.image.curx += left.image.incx;
						//DebugBreak();
						//printf( "." );
						while( left.image.err > 0 )
						{
#ifdef DEBUG_TIMING
							loops[10]++;
#endif
							left.image.err -= left.image.del.x;
							left.image.cury += left.image.incy;
						}
					}
				}
			} // if left.cury == final y
			if( (left.cury == points[left.idx].left.y) )
			{
            //DebugBreak();
				if( points[left.idx+1].flags.no_left || ( left.idx == 2 ) )
				{
					// done!
					break;
				}
				else
				{
					left.curx = points[left.idx].left.x;
					left.cury = points[left.idx].left.y; // really this is common... but for properness I should set it.
					left.image.curx = verts[points[left.idx].left.vertex_number].x;
					left.image.cury = verts[points[left.idx].left.vertex_number].y;
					left.del.x = points[left.idx+1].left.x - left.curx;
					if( left.del.x < 0 )
					{
						left.del.x = -left.del.x;
						left.incx = -1;
					}
					else
						left.incx = 1;

					left.del.y = points[left.idx+1].left.y - left.cury;
					if( left.del.y < 0 )
					{
						left.del.y = -left.del.y;
						left.incy = -1;
					}
					else
						left.incy = 1;
					left.del.out = left.del.y;

					left.image.del.x = verts[points[left.idx+1].left.vertex_number].x - left.image.curx;
					if( left.image.del.x < 0 )
					{
						left.image.del.x = -left.image.del.x;
						left.image.incx = -1;
					}
					else if( left.image.del.x > 0 )
						left.image.incx = 1;
					else
						left.image.incx = 0;

					left.image.del.y = verts[points[left.idx+1].left.vertex_number].y - left.image.cury;
					if( left.image.del.y < 0 )
					{
						left.image.del.y = -left.image.del.y;
						left.image.incy = -1;
					}
					else if( left.image.del.y > 0 )
						left.image.incy = 1;
					else
						left.image.incy = 0;

					left.err = (-left.del.x)/2; // always incremented by del.y ( +1 y ) therefore comparison starts at /2 x;

					if( left.image.del.x > left.image.del.y )
					{
						left.del.image = left.image.del.x;
						left.err2 = ( -left.image.del.x ) / 2;
						left.image.err = (-left.image.del.y)/2;
					}
					else
					{
						left.del.image = left.image.del.y;
						left.err2 = ( -left.image.del.y ) / 2;
						left.image.err = (-left.image.del.x)/2;
					}
					left.idx++;
				}
			}

			if( right.idx ) // not at a point boundry ( cury != nexty )
			{
            // step the output coordinate....
				right.err += right.del.x;
				/* incy will always be 1... perhaps effectively zero...*/
				right.cury += right.incy;
				while( right.err > 0 )
				{
#ifdef DEBUG_TIMING
					loops[11]++;
#endif
					right.err -= right.del.y;
					right.curx += right.incx;
				}

				right.err2 += right.del.image;
				if( right.image.del.x < right.image.del.y )
				{
					while( right.err2 > 0 )
					{
#ifdef DEBUG_TIMING
						loops[12]++;
#endif
						right.err2 -= right.del.out; // the larger distance to go on the line.
						right.image.err += right.image.del.x;
						// increment the longer distance by a unit increment.
						right.image.cury += right.image.incy;
						while( right.image.err > 0 )
						{
#ifdef DEBUG_TIMING
							loops[13]++;
#endif
							right.image.err -= right.image.del.y;
							right.image.curx += right.image.incx;
						}
					}
				}
				else // right.image.del.x < right.image.del.y
				{
					while( right.err2 > 0 )
					{
#ifdef DEBUG_TIMING
						loops[14]++;
#endif
						right.err2 -= right.del.out; // the larger distance to go on the line.
						right.image.err += right.image.del.y;
						// increment the longer distance by a unit increment.
						right.image.curx += right.image.incx;
						while( right.image.err > 0 )
						{
#ifdef DEBUG_TIMING
							loops[15]++;
#endif
							right.image.err -= right.image.del.x;
							right.image.cury += right.image.incy;
						}
					}
				}
			} // if right.cury == destination point.

			if( (right.cury == points[right.idx].right.y) )
			{
            //DebugBreak();
				if( points[right.idx+1].flags.no_right || ( right.idx == 2 ) )
				{
					// done!
					break;
				}
				else
				{
					right.curx = points[right.idx].right.x;
					right.cury = points[right.idx].right.y;
					right.image.curx = verts[points[right.idx].right.vertex_number].x;
					right.image.cury = verts[points[right.idx].right.vertex_number].y;
					right.del.x = points[right.idx+1].right.x - right.curx;
					if( right.del.x < 0 )
					{
						right.del.x = -right.del.x;
						right.incx = -1;
					}
					else
						right.incx = 1;

					right.del.y = points[right.idx+1].right.y - points[right.idx].right.y;
					if( right.del.y < 0 )
					{
						right.del.y = -right.del.y;
						right.incy = -1;
					}
					else
						right.incy = 1;
					right.del.out = right.del.y;

					right.image.del.x = verts[points[right.idx+1].right.vertex_number].x - right.image.curx;
					if( right.image.del.x < 0 )
					{
						right.image.del.x = -right.image.del.x;
						right.image.incx = -1;
					}
					else if( right.image.del.x > 0 )
						right.image.incx = 1;
					else
						right.image.incx = 0;

					right.image.del.y = verts[points[right.idx+1].right.vertex_number].y - right.image.cury;
					if( right.image.del.y < 0 )
					{
						right.image.del.y = -right.image.del.y;
						right.image.incy = -1;
					}
					else if( right.image.del.y > 0 )
						right.image.incy = 1;
					else
						right.image.incy = 0;

					right.err = (-right.del.x)/2; // always incremented by del.y ( +1 y ) therefore comparison starts at /2 x;

					if( right.image.del.x > right.image.del.y )
					{
						right.del.image = right.image.del.x;
						right.err2 = ( -right.image.del.x ) / 2;
						right.image.err = (-right.image.del.y)/2;
					}
					else
					{
						right.del.image = right.image.del.y;
						right.err2 = ( -right.image.del.y ) / 2;
						right.image.err = (-right.image.del.x)/2;
					}
					right.idx++;
				}
			}
         //lprintf( "end line." );
		}