1 files changed, 11 insertions, 0 deletions
diff --git a/src/platform/graphics/cairo/CairoPainter.cpp b/src/platform/graphics/cairo/CairoPainter.cpp
index c899fc28..dcee70ad 100644
--- a/src/platform/graphics/cairo/CairoPainter.cpp
+++ b/src/platform/graphics/cairo/CairoPainter.cpp
@@ -1,4 +1,5 @@
 #include "cru/platform/graphics/cairo/CairoPainter.h"
+#include "cru/platform/Exception.h"
 #include "cru/platform/graphics/cairo/Base.h"
 #include "cru/platform/graphics/cairo/CairoResource.h"
 
@@ -14,24 +15,34 @@ CairoPainter::~CairoPainter() {
 }
 
 Matrix CairoPainter::GetTransform() {
+  CheckValidation();
   cairo_matrix_t matrix;
   cairo_get_matrix(cairo_, &matrix);
   return Convert(matrix);
 }
 
 void CairoPainter::SetTransform(const Matrix& matrix) {
+  CheckValidation();
   auto m = Convert(matrix);
   cairo_set_matrix(cairo_, &m);
 }
 
 void CairoPainter::ConcatTransform(const Matrix& matrix) {
+  CheckValidation();
   auto m = Convert(matrix);
   cairo_transform(cairo_, &m);
 }
 
 void CairoPainter::Clear(const Color& color) {
+  CheckValidation();
   cairo_set_source_rgba(cairo_, color.GetFloatRed(), color.GetFloatGreen(),
                         color.GetFloatBlue(), color.GetFloatAlpha());
   cairo_paint(cairo_);
 }
+
+void CairoPainter::CheckValidation() {
+  if (!valid_) {
+    throw ReuseException(u"Painter already ended drawing.");
+  }
+}
 }  // namespace cru::platform::graphics::cairo