8 files changed, 87 insertions, 4 deletions
diff --git a/include/cru/platform/graphics/cairo/Base.h b/include/cru/platform/graphics/cairo/Base.h
index 7e8eeaa1..a776f90c 100644
--- a/include/cru/platform/graphics/cairo/Base.h
+++ b/include/cru/platform/graphics/cairo/Base.h
@@ -9,3 +9,13 @@
 #else
 #define CRU_PLATFORM_GRAPHICS_CAIRO_API
 #endif
+
+#include <cairo/cairo.h>
+
+#include "../Base.h"
+
+namespace cru::platform::graphics::cairo {
+cairo_matrix_t CRU_PLATFORM_GRAPHICS_CAIRO_API Convert(const Matrix& matrix);
+Matrix CRU_PLATFORM_GRAPHICS_CAIRO_API Convert(const cairo_matrix_t* matrix);
+Matrix CRU_PLATFORM_GRAPHICS_CAIRO_API Convert(const cairo_matrix_t& matrix);
+}  // namespace cru::platform::graphics::cairo
diff --git a/include/cru/platform/graphics/cairo/CairoGeometry.h b/include/cru/platform/graphics/cairo/CairoGeometry.h
index 0ddedba4..f8391670 100644
--- a/include/cru/platform/graphics/cairo/CairoGeometry.h
+++ b/include/cru/platform/graphics/cairo/CairoGeometry.h
@@ -9,7 +9,8 @@ class CRU_PLATFORM_GRAPHICS_CAIRO_API CairoGeometry : public CairoResource,
                                                       public virtual IGeometry {
  public:
   CairoGeometry(CairoGraphicsFactory* factory, cairo_path_t* cairo_path,
-                bool auto_destroy);
+                const Matrix& transform = Matrix::Identity(),
+                bool auto_destroy = true);
   ~CairoGeometry();
 
   bool FillContains(const Point& point) override;
@@ -21,6 +22,7 @@ class CRU_PLATFORM_GRAPHICS_CAIRO_API CairoGeometry : public CairoResource,
 
  private:
   cairo_path_t* cairo_path_;
+  Matrix transform_;
   bool auto_destroy_;
 };
 
diff --git a/src/platform/graphics/cairo/Base.cpp b/src/platform/graphics/cairo/Base.cpp
new file mode 100644
index 00000000..3e24efc9
--- /dev/null
+++ b/src/platform/graphics/cairo/Base.cpp
@@ -0,0 +1,18 @@
+#include "cru/platform/graphics/cairo/Base.h"
+#include <cairo/cairo.h>
+
+namespace cru::platform::graphics::cairo {
+cairo_matrix_t Convert(const Matrix& matrix) {
+  cairo_matrix_t m;
+  cairo_matrix_init(&m, matrix.m11, matrix.m12, matrix.m21, matrix.m22,
+                    matrix.m31, matrix.m32);
+  return m;
+}
+
+Matrix Convert(const cairo_matrix_t* matrix) {
+  return Matrix(matrix->xx, matrix->yx, matrix->xy, matrix->yy, matrix->x0,
+                matrix->y0);
+}
+
+Matrix Convert(const cairo_matrix_t& matrix) { return Convert(&matrix); }
+}  // namespace cru::platform::graphics::cairo
diff --git a/src/platform/graphics/cairo/CMakeLists.txt b/src/platform/graphics/cairo/CMakeLists.txt
index 0fa618a0..31fa46d2 100644
--- a/src/platform/graphics/cairo/CMakeLists.txt
+++ b/src/platform/graphics/cairo/CMakeLists.txt
@@ -3,11 +3,12 @@ if (UNIX)
 	find_library(LIB_PANGO NAMES pango pango-1.0 REQUIRED)
 
 	add_library(CruPlatformGraphicsCairo SHARED
+	    Base.cpp
 		CairoBrush.cpp
 		CairoGeometry.cpp
 		CairoGraphicsFactory.cpp
 		CairoResource.cpp
 	)
 	target_compile_definitions(CruPlatformGraphicsCairo PRIVATE CRU_PLATFORM_GRAPHICS_CAIRO_EXPORT_API)
-	target_link_libraries(CruPlatformGraphicsCairo PUBLIC CruPlatformGraphics PRIVATE ${LIB_CAIRO} ${LIB_PANGO})
+	target_link_libraries(CruPlatformGraphicsCairo PUBLIC CruPlatformGraphics PUBLIC ${LIB_CAIRO} ${LIB_PANGO})
 endif()
diff --git a/src/platform/graphics/cairo/CairoGeometry.cpp b/src/platform/graphics/cairo/CairoGeometry.cpp
index 7abe273c..43ba08d8 100644
--- a/src/platform/graphics/cairo/CairoGeometry.cpp
+++ b/src/platform/graphics/cairo/CairoGeometry.cpp
@@ -3,9 +3,11 @@
 
 namespace cru::platform::graphics::cairo {
 CairoGeometry::CairoGeometry(CairoGraphicsFactory* factory,
-                             cairo_path_t* cairo_path, bool auto_destroy)
+                             cairo_path_t* cairo_path, const Matrix& transform,
+                             bool auto_destroy)
     : CairoResource(factory),
       cairo_path_(cairo_path),
+      transform_(transform),
       auto_destroy_(auto_destroy) {
   Expects(cairo_path);
 }
@@ -39,7 +41,7 @@ Rect CairoGeometry::GetBounds() {
 }
 
 std::unique_ptr<IGeometry> CairoGeometry::Transform(const Matrix& matrix) {
-  throw Exception(u"Not implemented");
+
 }
 
 std::unique_ptr<IGeometry> CairoGeometry::CreateStrokeGeometry(float width) {
diff --git a/test/platform/CMakeLists.txt b/test/platform/CMakeLists.txt
index 5116d54d..01f6966b 100644
--- a/test/platform/CMakeLists.txt
+++ b/test/platform/CMakeLists.txt
@@ -8,4 +8,8 @@ if (WIN32)
 	add_subdirectory(graphics/direct2d)
 endif()
 
+if (UNIX)
+    add_subdirectory(graphics/cairo)
+endif()
+
 catch_discover_tests(CruPlatformBaseTest)
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);
+  }
+}
diff --git a/test/platform/graphics/cairo/CMakeLists.txt b/test/platform/graphics/cairo/CMakeLists.txt
new file mode 100644
index 00000000..5d055aa2
--- /dev/null
+++ b/test/platform/graphics/cairo/CMakeLists.txt
@@ -0,0 +1,6 @@
+add_executable(CruPlatformGraphicsCairoTest
+	BaseTest.cpp
+)
+target_link_libraries(CruPlatformGraphicsCairoTest PRIVATE CruPlatformGraphicsCairo CruTestBase)
+
+catch_discover_tests(CruPlatformGraphicsCairoTest)