105 lines
4.3 KiB
C++
105 lines
4.3 KiB
C++
|
|
#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
|