(svn r24225) [1.2] -Backport from trunk:

- Fix: Conflicting strategies for resizing the main toolbar and statusbar after resizing the main window [FS#5136] (r24089)
- Fix: Significantly reduce the area that is redrawn for text effects [FS#5103] (r24068)
- Fix: Do not redraw up to 25% of the map when making a new vehicle visible for the first time (r24067)
- Fix: Do not redraw the text effect when nothing changed (r24066)

src/texteff.cpp

@@ -65,6 +65,7 @@ void UpdateTextEffect(TextEffectID te_id, StringID msg)
 {
 	/* Update details */
 	TextEffect *te = _text_effects.Get(te_id);
+	if (msg == te->string_id && GetDParam(0) == te->params_1) return;
 	te->string_id = msg;
 	te->params_1 = GetDParam(0);
 
@@ -88,9 +89,9 @@ void MoveAllTextEffects()
 			continue;
 		}
 
-		te->MarkDirty();
+		te->MarkDirty(ZOOM_LVL_OUT_8X);
 		te->top -= ZOOM_LVL_BASE;
-		te->MarkDirty();
+		te->MarkDirty(ZOOM_LVL_OUT_8X);
 	}
 }
 

src/vehicle.cpp

@@ -1416,6 +1416,9 @@ void VehicleUpdateViewport(Vehicle *v, bool dirty)
 	v->coord.bottom = pt.y + spr->height + 2 * ZOOM_LVL_BASE;
 
 	if (dirty) {
+		if (old_coord.left == INVALID_COORD) {
+			MarkSingleVehicleDirty(v);
+		} else {
 			MarkAllViewportsDirty(
 				min(old_coord.left,   v->coord.left),
 				min(old_coord.top,    v->coord.top),
@@ -1423,6 +1426,7 @@ void VehicleUpdateViewport(Vehicle *v, bool dirty)
 				max(old_coord.bottom, v->coord.bottom) + 1 * ZOOM_LVL_BASE
 			);
 		}
+	}
 }
 
 /**

src/viewport.cpp

@@ -143,6 +143,8 @@ struct ViewportDrawer {
 	Point foundation_offset[FOUNDATION_PART_END];    ///< Pixel offset for ground sprites on the foundations.
 };
 
+static void MarkViewportDirty(const ViewPort *vp, int left, int top, int right, int bottom);
+
 static ViewportDrawer _vd;
 
 TileHighlightData _thd;
@@ -1242,20 +1244,31 @@ void ViewportSign::UpdatePosition(int center, int top, StringID str)
 
 /**
  * Mark the sign dirty in all viewports.
+ * @param maxzoom Maximum %ZoomLevel at which the text is visible.
  *
  * @ingroup dirty
  */
-void ViewportSign::MarkDirty() const
+void ViewportSign::MarkDirty(ZoomLevel maxzoom) const
 {
-	/* We use ZOOM_LVL_MAX here, as every viewport can have another zoom,
+	Rect zoomlevels[ZOOM_LVL_COUNT];
-	 *  and there is no way for us to know which is the biggest. So make the
+
-	 *  biggest area dirty, and we are safe for sure.
+	for (ZoomLevel zoom = ZOOM_LVL_BEGIN; zoom != ZOOM_LVL_END; zoom++) {
-	 * We also add 1 to make sure the whole thing is redrawn. */
+		/* FIXME: This doesn't switch to width_small when appropriate. */
-	MarkAllViewportsDirty(
+		zoomlevels[zoom].left   = this->center - ScaleByZoom(this->width_normal / 2 + 1, zoom);
-		this->center - ScaleByZoom(this->width_normal / 2 + 1, ZOOM_LVL_MAX),
+		zoomlevels[zoom].top    = this->top    - ScaleByZoom(1, zoom);
-		this->top    - ScaleByZoom(1, ZOOM_LVL_MAX),
+		zoomlevels[zoom].right  = this->center + ScaleByZoom(this->width_normal / 2 + 1, zoom);
-		this->center + ScaleByZoom(this->width_normal / 2 + 1, ZOOM_LVL_MAX),
+		zoomlevels[zoom].bottom = this->top    + ScaleByZoom(VPSM_TOP + FONT_HEIGHT_NORMAL + VPSM_BOTTOM + 1, zoom);
-		this->top    + ScaleByZoom(VPSM_TOP + FONT_HEIGHT_NORMAL + VPSM_BOTTOM + 1, ZOOM_LVL_MAX));
+	}
+
+	Window *w;
+	FOR_ALL_WINDOWS_FROM_BACK(w) {
+		ViewPort *vp = w->viewport;
+		if (vp != NULL && vp->zoom <= maxzoom) {
+			assert(vp->width != 0);
+			Rect &zl = zoomlevels[vp->zoom];
+			MarkViewportDirty(vp, zl.left, zl.top, zl.right, zl.bottom);
+		}
+	}
 }
 
 static void ViewportDrawTileSprites(const TileSpriteToDrawVector *tstdv)

src/viewport_type.h

@@ -48,7 +48,7 @@ struct ViewportSign {
 	uint16 width_small;  ///< The width when zoomed out (small font)
 
 	void UpdatePosition(int center, int top, StringID str);
-	void MarkDirty() const;
+	void MarkDirty(ZoomLevel maxzoom = ZOOM_LVL_MAX) const;
 };
 
 /**

src/window.cpp

@@ -1753,16 +1753,19 @@ static void EnsureVisibleCaption(Window *w, int nx, int ny)
  * @param w       Window to resize
  * @param delta_x Delta x-size of changed window (positive if larger, etc.)
  * @param delta_y Delta y-size of changed window
+ * @param clamp_to_screen Whether to make sure the whole window stays visible
  */
-void ResizeWindow(Window *w, int delta_x, int delta_y)
+void ResizeWindow(Window *w, int delta_x, int delta_y, bool clamp_to_screen)
 {
 	if (delta_x != 0 || delta_y != 0) {
+		if (clamp_to_screen) {
 			/* Determine the new right/bottom position. If that is outside of the bounds of
 			 * the resolution clamp it in such a manner that it stays within the bounds. */
 			int new_right  = w->left + w->width  + delta_x;
 			int new_bottom = w->top  + w->height + delta_y;
 			if (new_right  >= (int)_cur_resolution.width)  delta_x -= Ceil(new_right  - _cur_resolution.width,  max(1U, w->nested_root->resize_x));
 			if (new_bottom >= (int)_cur_resolution.height) delta_y -= Ceil(new_bottom - _cur_resolution.height, max(1U, w->nested_root->resize_y));
+		}
 
 		w->SetDirty();
 
@@ -2988,7 +2991,7 @@ void RelocateAllWindows(int neww, int newh)
 				continue;
 
 			case WC_MAIN_TOOLBAR:
-				ResizeWindow(w, min(neww, *_preferred_toolbar_size) - w->width, 0);
+				ResizeWindow(w, min(neww, *_preferred_toolbar_size) - w->width, 0, false);
 
 				top = w->top;
 				left = PositionMainToolbar(w); // changes toolbar orientation
@@ -3000,14 +3003,14 @@ void RelocateAllWindows(int neww, int newh)
 				break;
 
 			case WC_STATUS_BAR:
-				ResizeWindow(w, min(neww, *_preferred_statusbar_size) - w->width, 0);
+				ResizeWindow(w, min(neww, *_preferred_statusbar_size) - w->width, 0, false);
 
 				top = newh - w->height;
 				left = PositionStatusbar(w);
 				break;
 
 			case WC_SEND_NETWORK_MSG:
-				ResizeWindow(w, Clamp(neww, 320, 640) - w->width, 0);
+				ResizeWindow(w, Clamp(neww, 320, 640) - w->width, 0, false);
 				top = newh - w->height - FindWindowById(WC_STATUS_BAR, 0)->height;
 				left = PositionNetworkChatWindow(w);
 				break;

src/window_func.h

@@ -19,7 +19,7 @@ Window *FindWindowById(WindowClass cls, WindowNumber number);
 Window *FindWindowByClass(WindowClass cls);
 void ChangeWindowOwner(Owner old_owner, Owner new_owner);
 
-void ResizeWindow(Window *w, int x, int y);
+void ResizeWindow(Window *w, int x, int y, bool clamp_to_screen = true);
 int PositionMainToolbar(Window *w);
 int PositionStatusbar(Window *w);
 int PositionNewsMessage(Window *w);