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32fec9f05b
Group include directives, sort within group: * In headers of GIL core and extensions: 1. boost/gil/extension/* 2. boost/gil/* 3. boost/* 4. C++ standard library headers * In programs: 1. boost/gil/* 2. boost/* 3. C++ standard library headers 4. "xxx.hpp" for local headers Add basic guidelines to CONTRIBUTING.md. Add/Remove #include <boost/config.hpp> or std headers un/necessary. Rename gil_concept.hpp to concepts.hpp. Remove gil_all.hpp - we already have all-in-one boost/gil.hpp. Tidy up and unify copyright and license header. Tidy up formatting and excessive whitespaces in some comments. Remove Doxygen block with file description, author, date, etc. Remove dead or commented pragmas and directives. Trim trailing whitespaces.
55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
//
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// Copyright 2005-2007 Adobe Systems Incorporated
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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#include <boost/gil/extension/io/jpeg_dynamic_io.hpp>
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// Example to demonstrate a way to compute gradients along x-axis
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using namespace boost::gil;
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template <typename Out>
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struct halfdiff_cast_channels {
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template <typename T> Out operator()(const T& in1, const T& in2) const {
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return Out((in2-in1)/2);
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}
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};
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template <typename SrcView, typename DstView>
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void x_gradient(const SrcView& src, const DstView& dst) {
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typedef typename channel_type<DstView>::type dst_channel_t;
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for (int y=0; y<src.height(); ++y) {
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typename SrcView::x_iterator src_it = src.row_begin(y);
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typename DstView::x_iterator dst_it = dst.row_begin(y);
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for (int x=1; x<src.width()-1; ++x) {
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static_transform(src_it[x-1], src_it[x+1], dst_it[x],
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halfdiff_cast_channels<dst_channel_t>());
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}
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}
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}
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template <typename SrcView, typename DstView>
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void x_luminosity_gradient(const SrcView& src, const DstView& dst) {
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typedef pixel<typename channel_type<SrcView>::type, gray_layout_t> gray_pixel_t;
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x_gradient(color_converted_view<gray_pixel_t>(src), dst);
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}
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int main() {
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rgb8_image_t img;
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jpeg_read_image("test.jpg",img);
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gray8s_image_t img_out(img.dimensions());
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fill_pixels(view(img_out),int8_t(0));
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x_luminosity_gradient(const_view(img), view(img_out));
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jpeg_write_view("out-x_gradient.jpg",color_converted_view<gray8_pixel_t>(const_view(img_out)));
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return 0;
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}
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