2 files changed, 25 insertions, 7 deletions
diff --git a/qt/ScintillaEditBase/PlatQt.cpp b/qt/ScintillaEditBase/PlatQt.cpp
index 6503d9c19..d61abf7b2 100644
--- a/qt/ScintillaEditBase/PlatQt.cpp
+++ b/qt/ScintillaEditBase/PlatQt.cpp
@@ -157,6 +157,16 @@ SurfaceImpl::SurfaceImpl()
 : device(nullptr), painter(nullptr), deviceOwned(false), painterOwned(false), x(0), y(0),
 	  codecName(nullptr), codec(nullptr)
 {}
+
+SurfaceImpl::SurfaceImpl(int width, int height, SurfaceMode mode_)
+{
+	if (width < 1) width = 1;
+	if (height < 1) height = 1;
+	deviceOwned = true;
+	device = new QPixmap(width, height);
+	mode = mode_;
+}
+
 SurfaceImpl::~SurfaceImpl()
 {
 	Clear();
@@ -203,6 +213,11 @@ void SurfaceImpl::InitPixMap(int width,
 	mode = psurfOther->mode;
 }
 
+std::unique_ptr<Surface> SurfaceImpl::AllocatePixMap(int width, int height)
+{
+	return std::make_unique<SurfaceImpl>(width, height, mode);
+}
+
 void SurfaceImpl::SetMode(SurfaceMode mode_)
 {
 	mode = mode_;
diff --git a/qt/ScintillaEditBase/PlatQt.h b/qt/ScintillaEditBase/PlatQt.h
index 8f4d2c51d..1fc476129 100644
--- a/qt/ScintillaEditBase/PlatQt.h
+++ b/qt/ScintillaEditBase/PlatQt.h
@@ -73,25 +73,28 @@ constexpr PRectangle RectangleInset(PRectangle rc, XYPOSITION delta) noexcept {
 
 class SurfaceImpl : public Surface {
 private:
-	QPaintDevice *device;
-	QPainter *painter;
-	bool deviceOwned;
-	bool painterOwned;
-	float x, y;
+	QPaintDevice *device = nullptr;
+	QPainter *painter = nullptr;
+	bool deviceOwned = false;
+	bool painterOwned = false;
+	float x = 0;
+	float y = 0;
 	SurfaceMode mode;
-	const char *codecName;
-	QTextCodec *codec;
+	const char *codecName = nullptr;
+	QTextCodec *codec = nullptr;
 
 	void Clear();
 
 public:
 	SurfaceImpl();
+	SurfaceImpl(int width, int height, SurfaceMode mode_);
 	virtual ~SurfaceImpl();
 
 	void Init(WindowID wid) override;
 	void Init(SurfaceID sid, WindowID wid) override;
 	void InitPixMap(int width, int height,
 		Surface *surface, WindowID wid) override;
+	std::unique_ptr<Surface> AllocatePixMap(int width, int height) override;
 
 	void SetMode(SurfaceMode mode) override;