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