asflip(3x)						   AfterStep X11 window manager 						asflip(3x)

NAME

       asflip - demonstrates flipping image in 90 degree increments libAfterImage/tutorials/ASFlip

NAMEASFlip
SYNOPSIS

       libAfterImage application for image rotation.

DESCRIPTION

       New steps described in this tutorial are :
       ASFlip.1. Flip value.
       ASFlip.2. Rotating ASImage.

SEE ALSO

       Tutorial 1: ASView  - explanation of basic steps needed to use
			     libAfterImage and some other simple things.
       Tutorial 2: ASScale - image scaling basics.
       Tutorial 3: ASTile  - image tiling and tinting.
       Tutorial 4: ASMerge - scaling and blending of arbitrary number of
			     images.
       Tutorial 5: ASGrad  - drawing multipoint linear gradients.

SOURCE

	   #include "../afterbase.h"
	   #include "../afterimage.h"
	   #include "common.h"

	   void usage()
	   {
	       printf( "Usage: asflip [-h]|[[-f flip]|[-m vertical] "
		       "[-g geom] image]");
	       printf( "
Where: image - is image filename
");
	       printf( "       flip  - rotation angle in degrees. "
		       "90, 180 and 270 degrees supported
");
	       printf( "       geom  - source image is tiled using this geometry, "
		       "prior to rotation
");
	       printf( "       vertical - 1 - mirror image in vertical direction, "
		       "0 - horizontal
");
	   }

	   int main(int argc, char* argv[])
	   {
	       Display *dpy = NULL;
	       ASVisual *asv ;
	       int screen = 0 , depth = 0 ;
	       char *image_file = "rose512.jpg" ;
	       int flip = FLIP_VERTICAL;
	       Bool vertical = False, mirror = False ;
	       int tile_x, tile_y, geom_flags = 0;
	       unsigned int tile_width, tile_height ;
	       ASImage *im = NULL;
	       ASImage *flipped_im = NULL ;

	       /* see ASView.1 : */
	       set_application_name( argv[0] );

	       if( argc > 1 )
	       {
		   int i = 1 ;
		   if( strcmp( argv[1], "-h" ) == 0 )
		   {
		       usage();
		       return 0;
		   }
		   for( i = 1 ; i < argc ; i++ )
		   {
		       if( argv[i][0] == '-' && i < argc-1 )
		       {
			   switch(argv[i][1])
			   {
			       case 'm' :
				   mirror = True;
				   vertical = atoi(argv[i+1]) ;
				   break ;
			       case 'f' :	   /* see ASFlip.1 */
				   mirror = False;
				   flip = atoi(argv[i+1])/90 ;
				   break ;
			       case 'g' :	   /* see ASTile.2 : */
				   geom_flags = XParseGeometry( argv[i+1],
								&tile_x, &tile_y,
								&tile_width,
								&tile_height );
				   break ;
			   }
			   ++i ;
		       }else
			   image_file = argv[i] ;
		   }
	       }else
		   usage();

	   #ifndef X_DISPLAY_MISSING
	       dpy = XOpenDisplay(NULL);
	       _XA_WM_DELETE_WINDOW = XInternAtom( dpy, "WM_DELETE_WINDOW", False);
	       screen = DefaultScreen(dpy);
	       depth = DefaultDepth( dpy, screen );
	   #endif
	       /* see ASView.2 : */
	       im = file2ASImage( image_file, 0xFFFFFFFF, SCREEN_GAMMA, 0, getenv("IMAGE_PATH"), NULL );
	       if( im == NULL )
		   return 1;

	       /* Making sure tiling geometry is sane : */
	       if( !get_flags(geom_flags, XValue ) )
		   tile_x = 0 ;
	       if( !get_flags(geom_flags, YValue ) )
		   tile_y = 0 ;
	       if( !get_flags(geom_flags, WidthValue ) )
	       {
		   if( !mirror )
		       tile_width = (get_flags(flip,FLIP_VERTICAL))?
				       im->height:im->width ;
		   else
		       tile_width = im->width ;
	       }
	       if( !get_flags(geom_flags, HeightValue ) )
	       {
		   if( !mirror )
		       tile_height = (get_flags(flip,FLIP_VERTICAL))?
				       im->width:im->height;
		   else
		       tile_height = im->height ;
	       }
	       printf( "%s: tiling image "%s" to %dx%d%+d%+d and then "
		       "flipping it by %d degrees
",
		       get_application_name(), image_file,
		       tile_width, tile_height,tile_x, tile_y, flip*90 );

	       /* see ASView.3 : */
	       asv = create_asvisual( dpy, screen, depth, NULL );

	       /* see ASFlip.2 : */
	       if( !mirror )
		   flipped_im = flip_asimage(  asv, im,
					       tile_x, tile_y,
					       tile_width, tile_height,
					       flip,
					       ASA_ASImage, 0,
					       ASIMAGE_QUALITY_DEFAULT );
	       else
		   flipped_im = mirror_asimage(asv, im,
					       tile_x, tile_y,
					       tile_width, tile_height,
					       vertical,
					       ASA_ASImage, 0,
					       ASIMAGE_QUALITY_DEFAULT );
	       destroy_asimage( &im );

	       if( flipped_im )
	       {
	   #ifndef X_DISPLAY_MISSING
		   /* see ASView.4 : */
		   Window w = create_top_level_window( asv, DefaultRootWindow(dpy),
						       32, 32,
						       tile_width, tile_height,
						       1, 0, NULL,
						       "ASFlip", image_file );
		   if( w != None )
		   {
		       Pixmap p ;

		       XMapRaised   (dpy, w);
		       /* see ASView.5 : */
		       p = asimage2pixmap( asv, DefaultRootWindow(dpy), flipped_im,
					   NULL, True );
		       destroy_asimage( &flipped_im );
		       /* see common.c: set_window_background_and_free() : */
		       p = set_window_background_and_free( w, p );
		       /* see common.c: wait_closedown() : */
		   }
		   wait_closedown(w);
		   dpy = NULL;
	   #else
		   /* writing result into the file */
		   ASImage2file( flipped_im, NULL, "asflip.jpg", ASIT_Jpeg, NULL );
		   destroy_asimage( &flipped_im );
	   #endif
	       }
	       return 0 ;
	   }

       libAfterImage/tutorials/ASFlip.1 [6.1]

SYNOPSIS

       Step 1. Flip value.

DESCRIPTION

       libAfterImage provides facility for rotating images in 90 degree
       increments - flipping essentially. Accordingly flip parameter could
       have 4 values - 0, -90, -180, -270 degrees.

EXAMPLE

	   flip = atoi(argv[2])/90;

SEE ALSO

       flip
       libAfterImage/tutorials/ASFlip.2 [6.2]

SYNOPSIS

       Step 2. Flipping ASImage.

DESCRIPTION

       Flipping can actually be combined with offset and tiling. Original
       image gets tiled to supplied rectangle, and then gets rotated to
       requested degree.

EXAMPLE

	   flipped_im = flip_asimage(asv, im,
					 tile_x, tile_y,
					 tile_width, tile_height,
					 flip,
					 ASA_XImage,0,
					 ASIMAGE_QUALITY_DEFAULT );
	       destroy_asimage( &im );

NOTES

       As far as we need to render rotated image right away - we set to_xim
       parameter to True, so that image will be rotated into XImage. Right
       after rotation is done - we can destroy original image.

SEE ALSO

       flip_asimage()

3rd Berkeley Distribution					AfterStep v.2.2.11							asflip(3x)