Fix mouse position bug when videoAr > displayAr

Crosshair drawing is broken when videoAr != displayAr

src/video_display.cpp

@@ -193,7 +193,7 @@ void VideoDisplay::Render() try {
 		PositionVideo();
 
 	videoOut->Render(viewport_left, viewport_bottom, viewport_width, viewport_height);
-	E(glViewport(0, viewport_bottom, videoSize.GetWidth(), videoSize.GetHeight()));
+	E(glViewport(0, viewport_bottom_end, videoSize.GetWidth(), videoSize.GetHeight()));
 
 	E(glMatrixMode(GL_PROJECTION));
 	E(glLoadIdentity());
@@ -270,8 +270,11 @@ void VideoDisplay::PositionVideo() {
 	auto provider = con->project->VideoProvider();
 	if (!provider || !IsShownOnScreen()) return;
 
+	int client_w, client_h;
+	GetClientSize(&client_w, &client_h);
+
 	viewport_left = 0;
-	viewport_bottom = GetClientSize().GetHeight() * scale_factor - videoSize.GetHeight();
+	viewport_bottom_end = viewport_bottom = client_h * scale_factor - videoSize.GetHeight();
 	viewport_top = 0;
 	viewport_width = videoSize.GetWidth();
 	viewport_height = videoSize.GetHeight();
@@ -299,12 +302,15 @@ void VideoDisplay::PositionVideo() {
 	}
 
 	viewport_left += pan_x;
+	viewport_top += pan_y;
 	viewport_bottom -= pan_y;
+	viewport_bottom_end = std::min(viewport_bottom_end, 0);
 
-	if (tool)
+	if (tool) {
+		tool->SetClientSize(viewport_width, viewport_height);
 		tool->SetDisplayArea(viewport_left / scale_factor, viewport_top / scale_factor,
 		                     viewport_width / scale_factor, viewport_height / scale_factor);
-
+	}
 	Render();
 }
 
@@ -368,11 +374,8 @@ void VideoDisplay::OnMouseEvent(wxMouseEvent& event) {
 		PositionVideo();
 	}
 
-	if (tool) {
-		if (pan_y)
-			event.SetPosition(wxPoint(event.GetX(), event.GetY() - pan_y));
+	if (tool)
 		tool->OnMouseEvent(event);
-	}
 }
 
 void VideoDisplay::OnMouseLeave(wxMouseEvent& event) {

src/video_display.h

@@ -79,6 +79,8 @@ class VideoDisplay final : public wxGLCanvas {
 	int viewport_width = 0;
 	/// Screen pixels between the bottom of the canvas and the bottom of the video; used for glViewport
 	int viewport_bottom = 0;
+	/// The REAL bottom of the viewport; used only for glViewport
+	int viewport_bottom_end = 0;
 	/// Screen pixels between the bottom of the canvas and the top of the video; used for coordinate space conversion
 	int viewport_top = 0;
 	/// The height of the video in screen pixels

src/visual_tool.cpp

@@ -132,6 +132,10 @@ AssDialogue* VisualToolBase::GetActiveDialogueLine() {
 	return nullptr;
 }
 
+void VisualToolBase::SetClientSize(int w, int h) {
+	client_size = Vector2D(w, h);
+}
+
 void VisualToolBase::SetDisplayArea(int x, int y, int w, int h) {
 	if (x == video_pos.X() && y == video_pos.Y() && w == video_res.X() && h == video_res.Y()) return;
 

src/visual_tool.h

@@ -104,6 +104,7 @@ protected:
 	Vector2D script_res; ///< Script resolution
 	Vector2D video_pos; ///< Top-left corner of the video in the display area
 	Vector2D video_res; ///< Video resolution
+	Vector2D client_size; ///< The size of the display area
 
 	const agi::OptionValue *highlight_color_primary_opt;
 	const agi::OptionValue *highlight_color_secondary_opt;
@@ -144,6 +145,7 @@ public:
 	// Stuff called by VideoDisplay
 	virtual void OnMouseEvent(wxMouseEvent &event)=0;
 	virtual void Draw()=0;
+	virtual void SetClientSize(int w, int h);
 	virtual void SetDisplayArea(int x, int y, int w, int h);
 	virtual void SetToolbar(wxToolBar *) { }
 	virtual ~VisualToolBase() = default;

src/visual_tool_cross.cpp

@@ -69,10 +69,10 @@ void VisualToolCross::Draw() {
 	gl.SetInvert();
 	gl.SetLineColour(*wxWHITE, 1.0, 1);
 	float lines[] = {
-		video_pos.X(), mouse_pos.Y(),
-		video_res.X() + video_pos.X(), mouse_pos.Y(),
+		0.f, mouse_pos.Y(),
+		client_size.X(), mouse_pos.Y(),
 		mouse_pos.X(), 0.f,
-		mouse_pos.X(), video_res.Y() + video_pos.Y() * 2
+		mouse_pos.X(), client_size.Y(),
 	};
 	gl.DrawLines(2, lines, 4);
 	gl.ClearInvert();