101 lines
3.7 KiB
C++
101 lines
3.7 KiB
C++
#include "catch.hpp"
|
|
|
|
// mapnik
|
|
#include <mapnik/image_any.hpp>
|
|
#include <mapnik/color.hpp>
|
|
#include <mapnik/image_util.hpp>
|
|
|
|
TEST_CASE("image set_alpha") {
|
|
|
|
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::set_alpha(im, 0.25);
|
|
mapnik::set_alpha(im_any, 0.25);
|
|
mapnik::set_alpha(im2, 0.25);
|
|
mapnik::set_alpha(im2_any, 0.25);
|
|
|
|
|
|
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()) == 63);
|
|
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()) == 63);
|
|
// 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()) == 28);
|
|
CHECK(static_cast<int>(out.green()) == 35);
|
|
CHECK(static_cast<int>(out.blue()) == 63);
|
|
CHECK(static_cast<int>(out.alpha()) == 63);
|
|
out = mapnik::get_pixel<mapnik::color>(im2_any, 0, 0);
|
|
CHECK(static_cast<int>(out.red()) == 28);
|
|
CHECK(static_cast<int>(out.green()) == 35);
|
|
CHECK(static_cast<int>(out.blue()) == 63);
|
|
CHECK(static_cast<int>(out.alpha()) == 63);
|
|
|
|
} // 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::set_alpha(im, 1.25);
|
|
|
|
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()) == 255);
|
|
|
|
} // 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::set_alpha(im, -1.25);
|
|
|
|
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::set_alpha(im, 0.25));
|
|
CHECK_THROWS(mapnik::set_alpha(im_any, 0.25));
|
|
|
|
} // END SECTION
|
|
|
|
} // END TEST_CASE
|