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#include "catch.hpp"
// mapnik
#include <mapnik/image_any.hpp>
#include <mapnik/color.hpp>
#include <mapnik/image_util.hpp>
TEST_CASE("image apply_opacity") {
SECTION("test rgba8") {
mapnik::image_rgba8 im(4,4);
mapnik::image_rgba8 im2(4,4,true,true); // Initialize as already premultiplied
mapnik::image_any im_any(mapnik::image_rgba8(4,4));
mapnik::image_any im2_any(mapnik::image_rgba8(4,4,true,true));
// Fill the images with meaningfull values
mapnik::color c1(57,70,128,128); // This color is not premultiplied
mapnik::color c2(57,70,128,128, true); // This color is premultiplied
mapnik::fill(im, c1); // Because c1 is not premultiplied it will make the image not premultiplied
mapnik::fill(im_any, c1); // Because c1 is not premultiplied it will make the image not premultiplied
mapnik::fill(im2, c2); // Because c1 is premultiplied it will make the image premultiplied
mapnik::fill(im2_any, c2); // Because c1 is premultiplied it will make the image premultiplied
mapnik::apply_opacity(im, 0.75);
mapnik::apply_opacity(im_any, 0.75);
mapnik::apply_opacity(im2, 0.75);
mapnik::apply_opacity(im2_any, 0.75);
mapnik::color out;
// This should have only changed the alpha, as it was not premultipleid
out = mapnik::get_pixel<mapnik::color>(im, 0, 0);
CHECK(static_cast<int>(out.red()) == 57);
CHECK(static_cast<int>(out.green()) == 70);
CHECK(static_cast<int>(out.blue()) == 128);
CHECK(static_cast<int>(out.alpha()) == 96);
out = mapnik::get_pixel<mapnik::color>(im_any, 0, 0);
CHECK(static_cast<int>(out.red()) == 57);
CHECK(static_cast<int>(out.green()) == 70);
CHECK(static_cast<int>(out.blue()) == 128);
CHECK(static_cast<int>(out.alpha()) == 96);
// This will be different because it is demultiplied then premultiplied again after setting alpha
out = mapnik::get_pixel<mapnik::color>(im2, 0, 0);
CHECK(static_cast<int>(out.red()) == 43);
CHECK(static_cast<int>(out.green()) == 53);
CHECK(static_cast<int>(out.blue()) == 96);
CHECK(static_cast<int>(out.alpha()) == 96);
out = mapnik::get_pixel<mapnik::color>(im2_any, 0, 0);
CHECK(static_cast<int>(out.red()) == 43);
CHECK(static_cast<int>(out.green()) == 53);
CHECK(static_cast<int>(out.blue()) == 96);
CHECK(static_cast<int>(out.alpha()) == 96);
} // END SECTION
SECTION("test rgba8 overflow") {
mapnik::image_rgba8 im(4,4);
mapnik::color c(128,128,128,128); // This color is premultiplied
mapnik::fill(im, c); // Because c1 is not premultiplied it will make the image not premultiplied
mapnik::color out;
out = mapnik::get_pixel<mapnik::color>(im, 0, 0);
CHECK(static_cast<int>(out.red()) == 128);
CHECK(static_cast<int>(out.green()) == 128);
CHECK(static_cast<int>(out.blue()) == 128);
CHECK(static_cast<int>(out.alpha()) == 128);
mapnik::apply_opacity(im, 2.5);
out = mapnik::get_pixel<mapnik::color>(im, 0, 0);
CHECK(static_cast<int>(out.red()) == 128);
CHECK(static_cast<int>(out.green()) == 128);
CHECK(static_cast<int>(out.blue()) == 128);
CHECK(static_cast<int>(out.alpha()) == 128);
} // END SECTION
SECTION("test rgba8 underflow") {
mapnik::image_rgba8 im(4,4);
mapnik::color c(128,128,128,128); // This color is premultiplied
mapnik::fill(im, c); // Because c1 is not premultiplied it will make the image not premultiplied
mapnik::apply_opacity(im, -2.5);
mapnik::color out;
out = mapnik::get_pixel<mapnik::color>(im, 0, 0);
CHECK(static_cast<int>(out.red()) == 128);
CHECK(static_cast<int>(out.green()) == 128);
CHECK(static_cast<int>(out.blue()) == 128);
CHECK(static_cast<int>(out.alpha()) == 0);
} // END SECTION
SECTION("test gray8") {
mapnik::image_gray8 im(4,4);
mapnik::image_any im_any(mapnik::image_gray8(4,4));
CHECK_THROWS(mapnik::apply_opacity(im, 0.25));
CHECK_THROWS(mapnik::apply_opacity(im_any, 0.25));
} // END SECTION
} // END TEST_CASE
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