add some more examples

This commit is contained in:
John Cupitt 2022-09-09 10:14:59 +01:00
parent ce31c04cd2
commit d836166087
5 changed files with 143 additions and 1 deletions

View File

@ -1,5 +1,7 @@
examples = [ examples = [
'annotate-animated', 'annotate-animated',
'new-from-buffer',
'progress-cancel',
] ]
foreach example : examples foreach example : examples

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@ -0,0 +1,54 @@
/* Read and write formatted images to memory.
*
* Compile with:
*
* gcc -g -Wall new-from-buffer.c `pkg-config vips --cflags --libs`
*
*/
#include <vips/vips.h>
int
main( int argc, char **argv )
{
gchar *buf;
gsize len;
int i;
if( VIPS_INIT( argv[0] ) )
vips_error_exit( NULL );
if( argc != 2 )
vips_error_exit( "usage: %s FILENAME", argv[0] );
if( !g_file_get_contents( argv[1], &buf, &len, NULL ) )
vips_error_exit( NULL );
for( i = 0; i < 10; i++ ) {
VipsImage *image;
void *new_buf;
size_t new_len;
printf( "loop %d ...\n", i );
if( !(image = vips_image_new_from_buffer( buf, len, "",
"access", VIPS_ACCESS_SEQUENTIAL,
NULL )) )
vips_error_exit( NULL );
if( vips_image_write_to_buffer( image,
".jpg", &new_buf, &new_len,
"Q", 95,
NULL ) )
vips_error_exit( NULL );
g_object_unref( image );
g_free( new_buf );
}
g_free( buf );
vips_shutdown();
return( 0 );
}

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@ -0,0 +1,78 @@
/* Show progress feedback and computation cancel.
*
* compile with
*
* gcc -g -Wall progress-cancel.c `pkg-config vips --cflags --libs`
*/
#include <stdio.h>
#include <vips/vips.h>
#include <errno.h>
void
preeval_callback( VipsImage *image, VipsProgress *progress, void* pdata )
{
printf( "preeval_callback:\n" );
}
void
eval_callback( VipsImage *image, VipsProgress *progress, void* pdata )
{
printf( "eval_callback: percent = %d\n", progress->percent );
if( progress->percent >= 25 ) {
printf( "calling vips_image_set_kill() ...\n" );
vips_image_set_kill( image, TRUE );
}
}
void
posteval_callback( VipsImage *image, VipsProgress *progress, void* pdata )
{
printf( "posteval_callback: finished in %.3gs\n",
g_timer_elapsed( progress->start, NULL ) );
}
int
main( int argc, char **argv )
{
VipsImage *image;
VipsImage *out;
void *output;
size_t output_length;
if( VIPS_INIT( argv[0] ) )
vips_error_exit( NULL );
if( argc != 3 )
vips_error_exit( "usage: %s INPUT-FILE OUTPUT-FILE", argv[0] );
if( !(image = vips_image_new_from_file( argv[1],
"access", VIPS_ACCESS_SEQUENTIAL,
NULL )) )
vips_error_exit( NULL );
if( vips_resize( image, &out, 0.5, NULL ) )
vips_error_exit( NULL );
vips_image_set_progress( out, TRUE );
g_signal_connect( out, "preeval",
G_CALLBACK( preeval_callback ), NULL );
g_signal_connect( out, "eval",
G_CALLBACK( eval_callback ), NULL );
g_signal_connect( out, "posteval",
G_CALLBACK( posteval_callback ), NULL );
output = NULL;
if( vips_image_write_to_buffer( out, argv[2], &output, &output_length,
NULL ) )
printf( "error return from vips_image_write_to_buffer()\n" );
g_object_unref( out );
g_object_unref( image );
if( output )
g_free( output );
vips_shutdown();
return 0;
}

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@ -633,6 +633,7 @@ build_summary = {
'enable gtk-doc': [get_option('gtk_doc')], 'enable gtk-doc': [get_option('gtk_doc')],
'enable doxygen': [get_option('doxygen')], 'enable doxygen': [get_option('doxygen')],
'enable introspection': [get_option('introspection')], 'enable introspection': [get_option('introspection')],
'enable examples': [get_option('examples')],
'enable RAD load/save': [get_option('radiance')], 'enable RAD load/save': [get_option('radiance')],
'enable Analyze7 load/save': [get_option('analyze')], 'enable Analyze7 load/save': [get_option('analyze')],
'enable PPM load/save': [get_option('ppm')], 'enable PPM load/save': [get_option('ppm')],
@ -686,6 +687,8 @@ subdir('cplusplus')
subdir('man') subdir('man')
subdir('po') subdir('po')
subdir('tools') subdir('tools')
subdir('examples') if get_option('examples')
subdir('examples')
endif
subdir('test') subdir('test')
subdir('fuzz') subdir('fuzz')

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@ -5,6 +5,11 @@ option('deprecated',
value: true, value: true,
description: 'Build deprecated components') description: 'Build deprecated components')
option('examples',
type: 'boolean',
value: true,
description: 'Build example programs')
option('doxygen', option('doxygen',
type: 'boolean', type: 'boolean',
value: false, value: false,