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generate indexed_image_view from two views

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This commit is contained in:
Christian Henning
2018-03-22 10:22:34 -04:00
committed by Stefan Seefeld
parent 86466ee82a
commit 9a7bfe8f71
2 changed files with 75 additions and 0 deletions
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30
include/boost/gil/extension/toolbox/image_types/indexed_image.hpp
View File

@@ -209,6 +209,36 @@ private:
std::size_t _num_colors;
};
// build an indexed_image_view from two views
template<typename Index_View, typename Palette_View>
indexed_image_view
<
typename indexed_image_locator_type
<
typename Index_View::locator
, typename Palette_View::locator
>::type
>
view(Index_View iv, Palette_View pv)
{
typedef indexed_image_view<
typename indexed_image_locator_type<
typename Index_View::locator
, typename Palette_View::locator
>::type
> view_t;
typedef indexed_image_deref_fn<
typename Index_View::locator
, typename Palette_View::locator
> defer_fn_t;
return view_t(
iv.dimensions()
, pv.dimensions().x
, view_t::locator(point_t(0, 0), point_t(1, 1), defer_fn_t(iv.xy_at(0, 0), pv.xy_at(0, 0)))
);
}
template< typename Index
, typename Pixel

45
toolbox/test/indexed_image_test.cpp
View File

@@ -152,4 +152,49 @@ BOOST_AUTO_TEST_CASE( index_image_test )
}
}
BOOST_AUTO_TEST_CASE(index_image_view_test)
{
// generate some data
int width = 640;
int height = 480;
int num_colors = 3;
// indices
vector<uint8_t> indices(width * height, 2);
// colors
vector<rgb8_pixel_t> palette(num_colors);
palette[0] = rgb8_pixel_t(10, 20, 30);
palette[1] = rgb8_pixel_t(40, 50, 60);
palette[2] = rgb8_pixel_t(70, 80, 90);
// create image views from raw memory
typedef gray8_image_t::view_t::locator indices_loc_t;
typedef rgb8_image_t::view_t::locator palette_loc_t;
auto indices_view = interleaved_view(width, height
, (gray8_image_t::view_t::x_iterator) indices.data()
, width // row size in bytes
);
auto palette_view = interleaved_view(100, 1
, (rgb8_image_t::view_t::x_iterator) palette.data()
, num_colors * 3 // row size in bytes
);
auto ii_view = view(indices_view, palette_view);
auto p = ii_view(point_t(0, 0));
auto q = *ii_view.at(point_t(0, 0));
assert(get_color(p, red_t()) == 70);
assert(get_color(p, green_t()) == 80);
assert(get_color(p, blue_t()) == 90);
assert(get_color(q, red_t()) == 70);
assert(get_color(q, green_t()) == 80);
assert(get_color(q, blue_t()) == 90);
}
BOOST_AUTO_TEST_SUITE_END()