1 files changed, 40 insertions, 0 deletions
diff --git a/test/platform/graphics/cairo/BaseTest.cpp b/test/platform/graphics/cairo/BaseTest.cpp
new file mode 100644
index 00000000..29e53ff0
--- /dev/null
+++ b/test/platform/graphics/cairo/BaseTest.cpp
@@ -0,0 +1,40 @@
+#include "cru/platform/graphics/cairo/Base.h"
+
+#include <cairo/cairo.h>
+#include <catch2/catch_test_macros.hpp>
+#include "catch2/catch_approx.hpp"
+
+using Catch::Approx;
+
+TEST_CASE("Cairo Matrix Convert", "[matrix]") {
+  using namespace cru::platform;
+  using namespace cru::platform::graphics;
+  using namespace cru::platform::graphics::cairo;
+
+  SECTION("Cairo to cru should work") {
+    cairo_matrix_t cairo_matrix;
+    cairo_matrix_init_identity(&cairo_matrix);
+    cairo_matrix_scale(&cairo_matrix, 2, 2);
+    cairo_matrix_rotate(&cairo_matrix, 1);
+    cairo_matrix_translate(&cairo_matrix, 10, 10);
+    auto cru_matrix = Convert(cairo_matrix);
+    Point original_point(3, 5);
+    double cairo_point_x = original_point.x, cairo_point_y = original_point.y;
+    cairo_matrix_transform_point(&cairo_matrix, &cairo_point_x, &cairo_point_y);
+    Point cru_point = cru_matrix.TransformPoint(original_point);
+    REQUIRE(Approx(cru_point.x) == cairo_point_x);
+    REQUIRE(Approx(cru_point.y) == cairo_point_y);
+  }
+
+  SECTION("Cru to cairo should work") {
+    auto cru_matrix = Matrix::Identity() * Matrix::Scale(2, 2) *
+                      Matrix::Rotation(60) * Matrix::Translation(10, 10);
+    cairo_matrix_t cairo_matrix = Convert(cru_matrix);
+    Point original_point(3, 5);
+    double cairo_point_x = original_point.x, cairo_point_y = original_point.y;
+    cairo_matrix_transform_point(&cairo_matrix, &cairo_point_x, &cairo_point_y);
+    Point cru_point = cru_matrix.TransformPoint(original_point);
+    REQUIRE(Approx(cru_point.x) == cairo_point_x);
+    REQUIRE(Approx(cru_point.y) == cairo_point_y);
+  }
+}