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Implement hstack and vstack (boostorg#506)
Allow non-equal dims along stack dim Width can be different in hstack, height can be different in vstack
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| #include "boost/gil/image_view_factory.hpp" | ||
| #include <boost/gil/image.hpp> | ||
| #include <boost/gil/image_view.hpp> | ||
| #include <numeric> | ||
| #include <stdexcept> | ||
| #include <vector> | ||
|
|
||
| namespace boost { namespace gil { | ||
| template <typename View> | ||
| void hstack(const std::vector<View>& views, const View& output_view) | ||
| { | ||
| if (views.size() == 0) | ||
| { | ||
| throw std::invalid_argument("empty views vector is passed - cannot create stacked image"); | ||
| } | ||
|
|
||
| auto height = views.front().height(); | ||
| auto width = views.front().width(); | ||
| for (const auto& view : views) | ||
| { | ||
| if (view.height() != height) | ||
| { | ||
| throw std::invalid_argument("one or many views are not of the same height"); | ||
| } | ||
| } | ||
|
|
||
| std::ptrdiff_t full_width = | ||
| std::accumulate(views.begin(), views.end(), 0, | ||
| [](std::ptrdiff_t old, const View& view) { return old + view.width(); }); | ||
| if (output_view.width() != full_width || output_view.height() != height) | ||
| { | ||
| throw std::invalid_argument("the destination view is not of the right dimensions"); | ||
| } | ||
|
|
||
| std::ptrdiff_t current_x = 0; | ||
| for (std::size_t i = 0; i < views.size(); ++i) | ||
| { | ||
| auto subview = | ||
| subimage_view(output_view, current_x, 0, views[i].width(), views[i].height()); | ||
| copy_pixels(views[i], subview); | ||
| current_x += views[i].width(); | ||
| } | ||
| } | ||
|
|
||
| template <typename View> | ||
| image<typename View::value_type> hstack(const std::vector<View>& views) | ||
| { | ||
| if (views.size() == 0) | ||
| { | ||
| throw std::invalid_argument("empty views vector is passed - cannot create stacked image"); | ||
| } | ||
|
|
||
| auto dimensions = views.front().dimensions(); | ||
| std::ptrdiff_t full_width = | ||
| std::accumulate(views.begin(), views.end(), 0, | ||
| [](std::ptrdiff_t old, const View& view) { return old + view.width(); }); | ||
| std::ptrdiff_t height = views.front().height(); | ||
| image<typename View::value_type> result_image(full_width, height); | ||
| hstack(views, view(result_image)); | ||
| return result_image; | ||
| } | ||
|
|
||
| template <typename View> | ||
| void vstack(const std::vector<View>& views, const View& output_view) | ||
| { | ||
| if (views.size() == 0) | ||
| { | ||
| throw std::invalid_argument("empty views vector is passed - cannot create stacked image"); | ||
| } | ||
|
|
||
| auto full_height = | ||
| std::accumulate(views.begin(), views.end(), 0, | ||
| [](std::ptrdiff_t old, const View& view) { return old + view.height(); }); | ||
| std::ptrdiff_t width = views.front().height(); | ||
|
|
||
| for (const auto& view : views) | ||
| { | ||
| if (view.width() != width) | ||
| { | ||
| throw std::invalid_argument("one or many views are not of the same width"); | ||
| } | ||
| } | ||
|
|
||
| if (output_view != full_height || output_view.width() != width) | ||
| { | ||
| throw std::invalid_argument("the destination view is not of the right dimensions"); | ||
| } | ||
|
|
||
| std::ptrdiff_t current_y = 0; | ||
| for (std::size_t i = 0; i < views.size(); ++i) | ||
| { | ||
| auto subview = | ||
| subimage_view(output_view, 0, current_y, views[i].width(), views[i].height()); | ||
| copy_pixels(views[i], subview); | ||
| current_y += views[i].height(); | ||
| } | ||
| } | ||
|
|
||
| template <typename View> | ||
| image<typename View::value_type> vstack(const std::vector<View>& views) | ||
| { | ||
| if (views.size() == 0) | ||
| { | ||
| throw std::invalid_argument("empty views vector is passed - cannot create stacked image"); | ||
| } | ||
|
|
||
| auto full_height = | ||
| std::accumulate(views.begin(), views.end(), 0, | ||
| [](std::ptrdiff_t old, const View& view) { return old + view.height(); }); | ||
| std::ptrdiff_t width = views.front().height(); | ||
|
|
||
| image<typename View::value_type> result_image(width, full_height); | ||
| hstack(views, view(result_image)); | ||
| return result_image; | ||
| } | ||
| }} // namespace boost::gil |