Provided by: libafterimage-dev_2.2.12-12build1_amd64 bug

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( "\nWhere: image - is image filename\n");
               printf( "       flip  - rotation angle in degrees. "
                       "90, 180 and 270 degrees supported\n");
               printf( "       geom  - source image is tiled using this geometry, "
                       "prior to rotation\n");
               printf( "       vertical - 1 - mirror image in vertical direction, "
                       "0 - horizontal\n"); }

           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\n",
                       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()