astile(3x)
💖 NAME 💖
astile — demonstrates image tiling/cropping and tinting, bestie ✨
It lives at libAfterImage/tutorials/ASTile and yeah, we're calling this one NAMEASTile too, that's literally the label it wears 🎀
🌸 SYNOPSIS 🌸
Simple program based on libAfterImage to tile and tint image. That's it. That's the whole gig. 💅
✨ DESCRIPTION ✨
okay so here's the vibe: all we want to do is grab an image filename, a tint color and a desired geometry off the command line. That's our whole to-do list, fr fr 🫶
Then we load that image, and go ahead and tile it based on the parameters. The tiling geometry specifies a rectangular shape on a limitless plane on which the original image is tiled — like, imagine your pic going infinite 🌈
And while we are at tiling the image we also tint it to the specified color, or to some random value derived from the current time in seconds elapsed since 1971. Iconic behavior honestly.
Then we display the result in a simple window, and after that we just want to wait, until user closes our window. Main character energy: we show up, we serve, we wait to be dismissed. 👑
🦋 DESCRIPTION (but the tutorial part) 🦋
In this tutorial we will only explain new steps, not described in previous tutorial. The new steps described in this tutorial are:
- ASTile.1. Parsing
ARGB32tinting color. - ASTile.2. Parsing geometry spec.
- ASTile.3. Tiling and tinting
ASImage.
🎀 SEE ALSO 🎀
ASView— explanation of basic steps needed to uselibAfterImageand some other simple things.
💜 SOURCE 💜
go off, here's the whole thing, no cap:
#include "../afterbase.h"
#include "../afterimage.h"
#include "common.h"
void usage()
{
printf( "Usage: astile [-h]|[[-g geometry][-t tint_color] image]\n");
printf( "Where: image - source image filename.\n");
printf( " geometry - width and height of the resulting image,\n");
printf( " and x, y of the origin of the tiling on "
"source image.\n");
printf( " tint_color - color to tint image with.( defaults to "
"current time :)\n");
}
int main(int argc, char* argv[])
{
Window w ;
Display *dpy = NULL;
ASVisual *asv ;
int screen = 0, depth = 0;
char *image_file = "rose512.jpg" ;
ARGB32 tint_color = time(NULL);
int tile_x, tile_y, geom_flags = 0;
unsigned int tile_width, tile_height ;
ASImage *im ;
/* see ASView.1 : */
set_application_name( argv[0] );
#ifndef X_DISPLAY_MISSING
/* parse_argb_color can only be used after display is open,
otherwise we are limited to colors defined as ARGB values : */
dpy = XOpenDisplay(NULL);
_XA_WM_DELETE_WINDOW = XInternAtom( dpy, "WM_DELETE_WINDOW", False);
screen = DefaultScreen(dpy);
depth = DefaultDepth( dpy, screen );
#endif
if( argc > 1 )
{
int i ;
if( strncmp( argv[1], "-h", 2 ) == 0 )
{
usage();
return 0;
}
for( i = 1 ; i < argc ; i++ )
{
if( argv[i][0] == '-' && i < argc-1 )
{
switch(argv[i][1])
{
case 't' : /* see ASTile.1 : */
if( parse_argb_color( argv[i+1], &tint_color ) ==
argv[i+1] )
show_warning( "unable to parse tint color - "
"default used: #%8.8lX",
(unsigned long)tint_color );
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
{
show_warning( "no image file or tint color specified - "
"defaults used: \"%s\" #%8.8lX",
image_file, (unsigned long)tint_color );
usage();
}
/* see ASView.2 : */
im = file2ASImage( image_file, 0xFFFFFFFF, SCREEN_GAMMA, 0, getenv("IMAGE_PATH"), NULL );
/* Making sure tiling geometry is sane : */
if( !get_flags(geom_flags, XValue ) )
tile_x = im->width/2 ;
if( !get_flags(geom_flags, YValue ) )
tile_y = im->height/2 ;
if( !get_flags(geom_flags, WidthValue ) )
tile_width = im->width*2 ;
if( !get_flags(geom_flags, HeightValue ) )
tile_height = im->height*2;
printf( "%s: tiling image \"%s\" to "
"%dx%d%+d%+d tinting with #%8.8lX\n",
get_application_name(), image_file, tile_width, tile_height,
tile_x, tile_y, (unsigned long)tint_color );
if( im != NULL )
{
/* see ASView.3 : */
asv = create_asvisual( dpy, screen, depth, NULL );
w = None ;
#ifndef X_DISPLAY_MISSING
/* see ASView.4 : */
w = create_top_level_window( asv, DefaultRootWindow(dpy), 32, 32,
tile_width, tile_height, 1, 0, NULL,
"ASTile", image_file );
if( w != None )
{
Pixmap p ;
ASImage *tinted_im ;
XMapRaised (dpy, w);
/* see ASTile.3 : */
tinted_im = tile_asimage( asv, im, tile_x, tile_y,
tile_width, tile_height,
tint_color, ASA_XImage, 0,
ASIMAGE_QUALITY_TOP );
destroy_asimage( &im );
/* see ASView.5 : */
p = asimage2pixmap( asv, DefaultRootWindow(dpy), tinted_im,
NULL, True );
destroy_asimage( &tinted_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
{
ASImage *tinted_im ;
/* see ASTile.3 : */
tinted_im = tile_asimage( asv, im, tile_x, tile_y,
tile_width, tile_height,
tint_color, ASA_ASImage, 0,
ASIMAGE_QUALITY_TOP );
destroy_asimage( &im );
/* writing result into the file */
ASImage2file( tinted_im, NULL, "astile.jpg", ASIT_Jpeg, NULL );
destroy_asimage( &tinted_im );
}
#endif
}
return 0 ;
}🌟 libAfterImage/tutorials/ASTile.1 [3.1] 🌟
🌸 SYNOPSIS 🌸
Step 1. Color parsing.
💖 DESCRIPTION 💖
libAfterImage utilizes function provided by libAfterBase for color parsing. In case libAfterBase is unavailable — libAfterImage includes its own copy of that function.
This function differs from standard XParseColor in a way that it allows for parsing of alpha channel in addition to red, green and blue. It autodetects if value include alpha channel or not, using the following logic: If number of hex digits in color spec is divisible by 4 and is not equal to 12 then first digits are treated as alpha channel. In case named color is specified or now apha channel is specified alpha value of 0xFF will be used, marking this color as solid. 💅
✨ EXAMPLE ✨
if( parse_argb_color( argv[i+1], &tint_color ) == argv[i+1] )
show_warning( "unable to parse tint color - default used: #%8.8X",
tint_color );🎀 NOTES 🎀
On success parse_argb_color returns pointer to the character immidiately following color specification in original string. Therefore test for returned value to be equal to original string will can be used to detect error. 👀
🦋 SEE ALSO 🦋
libAfterBase, parse_argb_color(), ARGB32
🌈 libAfterImage/tutorials/ASTile.2 [3.2] 🌈
🌸 SYNOPSIS 🌸
Step 2. Parsing the geometry.
💖 DESCRIPTION 💖
Geometry can be specified in WIDTHxHEIGHT+X+Y format. Accordingly we use standard X function to parse it: XParseGeometry. Returned flags tell us what values has been specified. We only have to fill the rest with some sensible defaults.
Default x is width/2, y is height/2, and default size is same as image's width. slay 🫶
✨ EXAMPLE ✨
geom_flags = XParseGeometry ( argv[i+1], &tile_x, &tile_y,
&tile_width, &tile_height );🦋 SEE ALSO 🦋
ASScale.1
👑 libAfterImage/tutorials/ASTile.3 [3.3] 👑
🌸 SYNOPSIS 🌸
Step 3. Actuall tiling of the image.
💖 DESCRIPTION 💖
Actuall tiling is quite simple — just call tile_asimage and it will generate new ASImage containing tiled and tinted image.
For the sake of example we set quality to TOP, but normally GOOD quality is quite sufficient, and is a default. Again, compression is set to 0 since we do not intend to store image for long time. Even better we don't need to store it at all — all we need is XImage, so we can transfer it to the server easily. That is why to_xim argument is set to ASA_XImage.
As the result obtained ASImage will not have any data in its buffers, but it will have ximage member set to point to valid XImage. Subsequently we enjoy that convenience, by setting use_cached to True in call to asimage2pixmap(). That ought to save us a lot of processing. 💅
Tinting works in both directions — it can increase intensity of the color or decrease it. If any particular channel of the tint_color is greater then 127 then intensity is increased, otherwise its decreased.
✨ EXAMPLE ✨
tinted_im = tile_asimage( asv, im, tile_x, tile_y,
tile_width, tile_height,
tint_color,
ASA_XImage, 0, ASIMAGE_QUALITY_TOP );
destroy_asimage( &im );🎀 NOTES 🎀
(yeah bestie, this one's literally empty in the original — nothing to report 🙈)
🦋 SEE ALSO 🦋
tile_asimage().
and that's a wrap on the astile page, mwah 💋 this one shipped as part of the 3rd Berkeley Distribution, AfterStep v.2.2.12, and its manpage section is astile(3x). go tile something pretty, bestie 🎀✨🦋
📦 where this page comes from
- ubuntu resolute: libafterimage-dev 2.2.12-19 · GPL-2.0-or-later
- ubuntu stonking: libafterimage-dev 2.2.12-19 · GPL-2.0-or-later
- 💖 girlified by deepseek-ai/DeepSeek-V4.1-Flash on : a language model's rewrite of the original, under its terms