Change the uses of -1 for invalid positions in the visual typesetting tools to INT_MIN, as -1 is sometimes a perfectly valid coordinate

Originally committed to SVN as r4258.

aegisub/src/video_display.cpp

@@ -120,7 +120,7 @@ VideoDisplay::VideoDisplay(VideoBox *box, VideoSlider *ControlSlider, wxTextCtrl
 , origSize(size)
 , currentFrame(-1)
 , w(8), h(8), dx1(0), dx2(8), dy1(0), dy2(8)
-, mouse_x(-1), mouse_y(-1)
+, mouse_x(INT_MIN), mouse_y(INT_MIN)
 , locked(false)
 , zoomValue(1.0)
 , ControlSlider(ControlSlider)

aegisub/src/visual_feature.cpp

@@ -48,8 +48,8 @@
 ///
 VisualDraggableFeature::VisualDraggableFeature() {
 	type = DRAG_NONE;
-	x = -1;
-	y = -1;
+	x = INT_MIN;
+	y = INT_MIN;
 	value = value2 = 0;
 	layer = 0;
 	lineN = -1;

aegisub/src/visual_tool.cpp

@@ -87,7 +87,7 @@ VisualTool::VisualTool(VideoDisplay *par) : eventSink(this) {
 	dragListOK = false;
 
 	// Video options
-	mouseX = mouseY = -1;
+	mouseX = mouseY = INT_MIN;
 	frame_n = 0;
 	if (VideoContext::Get()->IsLoaded()) {
 		parent->GetClientSize(&w,&h);
@@ -124,10 +124,10 @@ void VisualTool::OnMouseEvent (wxMouseEvent &event) {
 
 	// Mouse leaving control
 	if (event.Leaving()) {
-		mouseX = -1;
-		mouseY = -1;
-		mx = -1;
-		my = -1;
+		mouseX = INT_MIN;
+		mouseY = INT_MIN;
+		mx = INT_MIN;
+		my = INT_MIN;
 		Update();
 		return;
 	}
@@ -393,10 +393,10 @@ void VisualTool::GetLinePosition(AssDialogue *diag,int &x, int &y) {
 void VisualTool::GetLinePosition(AssDialogue *diag,int &x, int &y, int &orgx, int &orgy) {
 	// No dialogue
 	if (!diag) {
-		x = -1;
-		y = -1;
-		orgx = -1;
-		orgy = -1;
+		x = INT_MIN;
+		y = INT_MIN;
+		orgx = INT_MIN;
+		orgy = INT_MIN;
 		return;
 	}
 
@@ -426,8 +426,8 @@ void VisualTool::GetLinePosition(AssDialogue *diag,int &x, int &y, int &orgx, in
 	// Position
 	bool posSet = false;
 	bool orgSet = false;
-	int posx = -1;
-	int posy = -1;
+	int posx = INT_MIN;
+	int posy = INT_MIN;
 
 	// Overrides processing
 	diag->ParseASSTags();

aegisub/src/visual_tool_clip.cpp

@@ -80,7 +80,7 @@ void VisualToolClip::Update() {
 /// @return 
 ///
 void VisualToolClip::Draw() {
-	if (mouseX == -1 || mouseY == -1) return;
+	if (mouseX == INT_MIN || mouseY == INT_MIN) return;
 	// Get current line
 	AssDialogue *line = GetActiveDialogueLine();
 	if (!line) return;

aegisub/src/visual_tool_cross.cpp

@@ -90,7 +90,7 @@ void VisualToolCross::Update() {
 /// @brief Draw 
 ///
 void VisualToolCross::Draw() {
-	if (mouseX == -1 || mouseY == -1) return;
+	if (mouseX == INT_MIN || mouseY == INT_MIN) return;
 
 	// Draw cross
 	glDisable(GL_LINE_SMOOTH);

aegisub/src/visual_tool_rotatez.cpp

@@ -160,7 +160,7 @@ void VisualToolRotateZ::Draw() {
 	glPopMatrix();
 
 	// Draw line to mouse
-	if (mouseX != -1 && !dragging && GetHighlightedFeature() == -1) {
+	if (!dragging && GetHighlightedFeature() == -1) {
 		SetLineColour(colour[0]);
 		DrawLine(dx,dy,mx,my);
 	}

aegisub/src/visual_tool_vector_clip.cpp

@@ -214,12 +214,10 @@ void VisualToolVectorClip::Draw() {
 	// Draw preview of inserted line
 	if (mode == 1 || mode == 2) {
 		if (spline.curves.size()) {
-			if (mx != -1 || my != -1) {
-				SplineCurve *c0 = &spline.curves.front();
-				SplineCurve *c1 = &spline.curves.back();
-				DrawDashedLine(mx,my,c0->p1.x,c0->p1.y,6);
-				DrawDashedLine(mx,my,c1->GetEndPoint().x,c1->GetEndPoint().y,6);
-			}
+			SplineCurve *c0 = &spline.curves.front();
+			SplineCurve *c1 = &spline.curves.back();
+			DrawDashedLine(mx,my,c0->p1.x,c0->p1.y,6);
+			DrawDashedLine(mx,my,c1->GetEndPoint().x,c1->GetEndPoint().y,6);
 		}
 	}
 	
@@ -492,7 +490,7 @@ void VisualToolVectorClip::UpdateHold() {
 
 	// Freehand
 	if (mode == 6 || mode == 7) {
-		if (lastX != -100000 && lastY != -100000) {
+		if (lastX !=	-100000 && lastY != -100000) {
 			// See if distance is enough
 			Vector2D delta(lastX-mx,lastY-my);
 			int len = (int)delta.Len();