VImage
VImage::new_from_image( std::vector<double> pixel )
{
VImage onepx = VImage::black( 1, 1,
VImage::option()->set( "bands", bands() ) );
onepx = onepx.linear( to_vectorv( 1, 1.0 ), pixel ).cast( format() );
VImage big = onepx.embed( 0, 0, width(), height(),
VImage::option()->set( "extend", VIPS_EXTEND_COPY ) );
big = big.copy(
VImage::option()->
set( "interpretation", interpretation() )->
set( "xres", xres() )->
set( "yres", yres() )->
set( "xoffset", xres() )->
set( "yoffset", yres() ) );
return( big );
}
VImage
operator/( VImage a, std::vector<double> b )
{
return( a.linear( vips::invert( b ), 0.0 ) );
}
VImage
operator/( VImage a, double b )
{
return( a.linear( 1.0 / b, 0.0 ) );
}
VImage
operator*( VImage a, std::vector<double> b )
{
return( a.linear( b, 0.0 ) );
}
VImage
operator*( std::vector<double> a, VImage b )
{
return( b.linear( a, 0.0 ) );
}
VImage
operator*( VImage a, double b )
{
return( a.linear( b, 0.0 ) );
}
VImage
operator*( double a, VImage b )
{
return( b.linear( a, 0.0 ) );
}
VImage
operator-( VImage a, std::vector<double> b )
{
return( a.linear( 1.0, vips::negate( b ) ) );
}
VImage
operator-( std::vector<double> a, VImage b )
{
return( b.linear( -1.0, a ) );
}
VImage
operator-( VImage a, double b )
{
return( a.linear( 1.0, -b ) );
}
VImage
operator-( double a, VImage b )
{
return( b.linear( -1.0, a ) );
}
VImage
operator+( VImage a, std::vector<double> b )
{
return( a.linear( 1.0, b ) );
}
int
main( int argc, char **argv )
{
GOptionContext *context;
GOptionGroup *main_group;
GError *error = NULL;
if( vips_init( argv[0] ) )
vips_error_exit( NULL );
context = g_option_context_new( "" );
main_group = g_option_group_new( NULL, NULL, NULL, NULL, NULL );
g_option_context_set_main_group( context, main_group );
g_option_context_add_group( context, vips_get_option_group() );
if( !g_option_context_parse( context, &argc, &argv, &error ) ) {
if( error ) {
fprintf( stderr, "%s\n", error->message );
g_error_free( error );
}
vips_error_exit( NULL );
}
{
VImage in = VImage::new_from_file( argv[1],
VImage::option()->set( "access", VIPS_ACCESS_SEQUENTIAL_UNBUFFERED ) );
double avg;
avg = in.avg();
printf( "avg = %g\n", avg );
}
{
VImage in = VImage::new_from_file( argv[1],
VImage::option()->set( "access", VIPS_ACCESS_SEQUENTIAL_UNBUFFERED ) );
VImage out = in.embed( 10, 10, 1000, 1000,
VImage::option()->set( "extend", VIPS_EXTEND_BACKGROUND )->
set( "background", 128 ) );
out.write_to_file( "embed.jpg" );
}
{
VImage in = VImage::new_from_file( argv[1],
VImage::option()->set( "access", VIPS_ACCESS_SEQUENTIAL_UNBUFFERED ) );
double a[] = { 1.0, 2.0, 3.0 };
double b[] = { 4.0, 5.0, 6.0 };
std::vector<double> avec( a, a + VIPS_NUMBER( a ) );
std::vector<double> bvec( b, b + VIPS_NUMBER( b ) );
VImage out = in.linear( avec, bvec );
out.write_to_file( "linear.jpg" );
}
{
VImage in = VImage::new_from_file( argv[1],
VImage::option()->set( "access", VIPS_ACCESS_SEQUENTIAL_UNBUFFERED ) );
VImage out = in.linear( 1, 2 );
out.write_to_file( "linear1.jpg" );
}
{
VImage in = VImage::new_from_file( argv[1] );
VImage out = in.new_from_image( 128 );
out.write_to_file( "const.jpg" );
}
vips_shutdown();
return( 0 );
}
VImage
operator+( const std::vector<double> a, const VImage b )
{
return( b.linear( 1.0, a ) );
}
VImage
operator+( const VImage a, double b )
{
return( a.linear( 1.0, b ) );
}
VImage
operator+( double a, const VImage b )
{
return( b.linear( 1.0, a ) );
}