0e3cac1a72
all overloads are declared const now, where possible also revised cpp examples and ran them to check see https://github.com/jcupitt/libvips/issues/983
370 lines
8.0 KiB
C++
370 lines
8.0 KiB
C++
/* Test the C++ API.
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*
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* This isn't a full test suite, look in the Python area for that. This is
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* just supposed to check that the C++ binding is working.
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*
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* compile with:
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*
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* g++ -g -Wall test.cpp `pkg-config vips-cpp --cflags --libs`
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*
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* run with:
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*
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* ./a.out ~/pics/k2.jpg ~/pics/shark.jpg --vips-leak
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* valgrind --leak-check=yes ./a.out ~/pics/k2.jpg ~/pics/shark.jpg
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* rm x.tif
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*
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*/
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/*
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#define VIPS_DEBUG
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#define VIPS_DEBUG_VERBOSE
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*/
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#include <stdlib.h>
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#include <vips/vips8>
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using namespace vips;
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bool
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equal_vector( std::vector<double> a, std::vector<double> b )
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{
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for( unsigned int i = 0; i < a.size(); i++ )
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if( fabs( a[i] - b[i] ) > 0.001 ) {
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printf( "vectors differ at %u: should be [", i );
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for( unsigned int i = 0; i < a.size(); i++ ) {
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if( i > 0 )
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printf( ", " );
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printf( "%g", a[i] );
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}
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printf( "], is [" );
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for( unsigned int i = 0; i < a.size(); i++ ) {
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if( i > 0 )
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printf( ", " );
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printf( "%g", a[i] );
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}
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printf( "]\n" );
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return( false );
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}
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return( true );
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}
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bool
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equal_double( double a, double b )
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{
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if( fabs( a - b ) > 0.001 ) {
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printf( "doubles differ: should be %g, is %g\n", a, b );
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return( false );
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}
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return( true );
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}
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/* We can't do this with a template, I think we'd need partially-parameterised
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* template, which is C++11 only.
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*/
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/* Only test a few points and only test uchar: we are just testing the C++
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* overloads, we rely on the python test suite for testing the underlying
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* vips operators.
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*/
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#define TEST_BINARY( OPERATOR ) \
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void \
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test_binary_##OPERATOR( VImage left, VImage right ) \
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{ \
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for( int x = 10; x < 30; x += 10 ) { \
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std::vector<double> p_left = left.getpoint( x, x ); \
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std::vector<double> p_right = right.getpoint( x, x ); \
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std::vector<double> p_result = \
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OPERATOR<std::vector<double>, \
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std::vector<double>, \
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std::vector<double> >(p_left, p_right ); \
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\
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VImage im_result; \
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std::vector<double> p_im_result; \
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\
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/* test: image = image OP image \
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*/ \
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im_result = OPERATOR<VImage, VImage, VImage>( left, right ); \
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p_im_result = im_result.getpoint( x, x ); \
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\
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if( !equal_vector( p_result, p_im_result ) ) { \
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printf( #OPERATOR \
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"(VImage, VImage) failed at (%d, %d)\n", \
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x, x ); \
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abort(); \
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} \
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\
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/* test: image = image OP vec \
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*/ \
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im_result = \
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OPERATOR<VImage, \
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VImage, std::vector<double> >( left, p_right );\
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p_im_result = im_result.getpoint( x, x ); \
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\
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if( !equal_vector( p_result, p_im_result ) ) { \
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printf( #OPERATOR \
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"(VImage, vector) failed at (%d, %d)\n", \
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x, x ); \
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abort(); \
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} \
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\
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/* test: image = vec OP image \
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*/ \
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im_result = \
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OPERATOR<VImage, std::vector<double>, \
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VImage>( p_left, right ); \
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p_im_result = im_result.getpoint( x, x ); \
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\
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if( !equal_vector( p_result, p_im_result ) ) { \
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printf( #OPERATOR \
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"(vector, VImage) failed at (%d, %d)\n", \
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x, x ); \
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abort(); \
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} \
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\
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/* test: image = image OP double \
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*/ \
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for( unsigned int i = 0; i < p_right.size(); i++ ) { \
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im_result = \
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OPERATOR<VImage, \
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VImage, double>( left, p_right[i] ); \
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p_im_result = im_result.getpoint( x, x ); \
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\
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if( !equal_double( p_result[i], p_im_result[i] ) ) { \
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printf( #OPERATOR \
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"(VImage, double) failed at " \
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"(%d, %d)\n", \
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x, x ); \
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abort(); \
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} \
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} \
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\
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/* test: image = double OP image \
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*/ \
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for( unsigned int i = 0; i < p_left.size(); i++ ) { \
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im_result = \
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OPERATOR<VImage, \
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double, VImage>( p_left[i], right ); \
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p_im_result = im_result.getpoint( x, x ); \
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\
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if( !equal_double( p_result[i], p_im_result[i] ) ) { \
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printf( #OPERATOR \
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"(double, VImage) failed at " \
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"(%d, %d)\n", \
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x, x ); \
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abort(); \
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} \
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} \
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} \
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}
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// eg. double = double + double
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// or image = double + image
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template <typename A, typename B, typename C>
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A test_add( B left, C right )
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{
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return( left + right );
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}
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template <typename T>
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std::vector<T> operator+(std::vector<T> &v1, const std::vector<T> &v2)
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{
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std::vector<T> result( v1.size() );
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for( unsigned int i = 0; i < v1.size(); i++ )
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result[i] = v1[i] + v2[i];
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return( result );
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}
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TEST_BINARY( test_add );
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template <typename A, typename B, typename C>
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A test_subtract( B left, C right )
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{
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return( left - right );
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}
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template <typename T>
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std::vector<T> operator-(std::vector<T> &v1, const std::vector<T> &v2)
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{
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std::vector<T> result( v1.size() );
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for( unsigned int i = 0; i < v1.size(); i++ )
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result[i] = v1[i] - v2[i];
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return( result );
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}
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TEST_BINARY( test_subtract );
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template <typename A, typename B, typename C>
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A test_multiply( B left, C right )
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{
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return( left * right );
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}
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template <typename T>
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std::vector<T> operator*(std::vector<T> &v1, const std::vector<T> &v2)
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{
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std::vector<T> result( v1.size() );
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for( unsigned int i = 0; i < v1.size(); i++ )
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result[i] = v1[i] * v2[i];
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return( result );
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}
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TEST_BINARY( test_multiply );
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template <typename A, typename B, typename C>
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A test_divide( B left, C right )
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{
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return( left / right );
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}
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template <typename T>
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std::vector<T> operator/(std::vector<T> &v1, const std::vector<T> &v2)
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{
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std::vector<T> result( v1.size() );
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for( unsigned int i = 0; i < v1.size(); i++ )
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result[i] = v1[i] / v2[i];
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return( result );
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}
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TEST_BINARY( test_divide );
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int
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main( int argc, char **argv )
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{
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if( VIPS_INIT( argv[0] ) )
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vips_error_exit( NULL );
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VImage left = VImage::new_from_file( argv[1] );
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VImage right = VImage::new_from_file( argv[2] );
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{
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printf( "testing constant args ...\n" );
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double a[] = { 1.0, 2.0, 3.0 };
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double b[] = { 4.0, 5.0, 6.0 };
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std::vector<double> avec( a, a + VIPS_NUMBER( a ) );
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std::vector<double> bvec( b, b + VIPS_NUMBER( b ) );
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VImage out = left.linear( avec, bvec );
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out.write_to_file( "x.tif" );
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}
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{
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printf( "testing operator overloads ...\n" );
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test_binary_test_add( left, right );
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test_binary_test_subtract( left, right );
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test_binary_test_multiply( left, right );
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test_binary_test_divide( left, right );
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VImage band_one = left[1];
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std::vector<double> point = left(0, 0);
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}
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{
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// write to a formatted memory buffer
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printf( "testing formatted memory write ...\n" );
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size_t size;
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void *buf;
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left.write_to_buffer( ".png", &buf, &size );
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printf( "written to memory %p in png format, %zu bytes\n", buf, size );
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// load from the formatted memory area
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VImage im = VImage::new_from_buffer( buf, size, "" );
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printf( "loaded from memory, %d x %d pixel image\n",
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im.width(), im.height() );
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// write back to a file
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im.write_to_file( "x.tif" );
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printf( "written back to x.tif\n" );
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g_free( buf );
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}
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{
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// write to a vanilla memory buffer
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printf( "testing memory array write ...\n" );
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size_t size;
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void *buf;
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buf = left.write_to_memory( &size );
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printf( "written to memory %p as an array, %zu bytes\n", buf, size );
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// load from the memory array
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VImage im = VImage::new_from_memory( buf, size,
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left.width(), left.height(), left.bands(), left.format() );
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printf( "loaded from memory array, %d x %d pixel image\n",
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im.width(), im.height() );
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// write back to a file
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im.write_to_file( "x.tif" );
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printf( "written back to x.tif\n" );
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g_free( buf );
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}
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{
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printf( "testing double return from operation ...\n" );
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double avg = left.avg();
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printf( "left.avg() = %g\n", avg );
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}
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{
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printf( "testing optional enum args ...\n" );
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VImage out = left.embed( 10, 10, 1000, 1000,
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VImage::option()->set( "extend", "copy" ) );
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out.write_to_file( "x.tif" );
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}
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{
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printf( "testing multiple image return ...\n" );
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VImage rows;
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VImage cols = left.profile( &rows );
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rows.write_to_file( "x.tif" );
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cols.write_to_file( "x.tif" );
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}
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{
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printf( "testing interpolators ...\n" );
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VInterpolate interp = VInterpolate::new_from_name( "nohalo" );
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VImage out;
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out = left.resize( 0.2,
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VImage::option()->set( "interpolate", interp ) );
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out.write_to_file( "x.tif" );
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}
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{
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printf( "testing new_from_image() ...\n" );
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VImage out = left.new_from_image( 128 );
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out.write_to_file( "x.tif" );
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}
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printf( "all tests passed\n" );
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return( 0 );
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}
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