Show tile numbers when moving tilemaps

data/gui.xml

@@ -925,6 +925,7 @@
           <item command="ShowAutoGuides" text="@.view_show_auto_guides" />
           <item command="ShowSlices" text="@.view_show_slices" />
           <item command="ShowPixelGrid" text="@.view_show_pixel_grid" />
+          <item command="ShowTileNumbers" text="@.view_show_tile_numbers" />
           <separator />
           <item command="ShowBrushPreview" text="@.view_show_brush_preview" />
         </menu>

data/pref.xml

@@ -526,6 +526,7 @@
       <option id="brush_preview" type="bool" default="true" />
       <option id="slices" type="bool" default="true" />
       <option id="auto_guides" type="bool" default="true" />
+      <option id="tile_numbers" type="bool" default="true" />
     </section>
   </document>
 

data/strings/en.ini

@@ -470,6 +470,7 @@ ShowPaletteSortOptions = Show Palette Sort Options
 ShowPixelGrid = Show Pixel Grid
 ShowSelectionEdges = Show Selection Edges
 ShowSlices = Show Slices
+ShowTileNumbers = Show Tile Numbers
 SliceProperties = Slice Properties
 SnapToGrid = Snap to Grid
 SpriteProperties = Sprite Properties
@@ -973,6 +974,7 @@ view_show_auto_guides = &Auto Guides
 view_show_slices = Sl&ices
 view_show_pixel_grid = &Pixel Grid
 view_show_brush_preview = &Brush Preview
+view_show_tile_numbers = &Tile Numbers
 view_grid = &Grid
 view_grid_settings = Gri&d Settings
 view_grid_selection_as_grid = Select&ion as Grid

src/app/commands/cmd_show.cpp

@@ -1,4 +1,5 @@
 // Aseprite
+// Copyright (C) 2020  Igara Studio S.A.
 // Copyright (C) 2001-2017  David Capello
 //
 // This program is distributed under the terms of
@@ -183,6 +184,24 @@ protected:
   }
 };
 
+class ShowTileNumbersCommand : public Command {
+public:
+  ShowTileNumbersCommand()
+    : Command(CommandId::ShowTileNumbers(), CmdUIOnlyFlag) {
+  }
+
+protected:
+  bool onChecked(Context* ctx) override {
+    DocumentPreferences& docPref = Preferences::instance().document(ctx->activeDocument());
+    return docPref.show.tileNumbers();
+  }
+
+  void onExecute(Context* ctx) override {
+    DocumentPreferences& docPref = Preferences::instance().document(ctx->activeDocument());
+    docPref.show.tileNumbers(!docPref.show.tileNumbers());
+  }
+};
+
 Command* CommandFactory::createShowExtrasCommand()
 {
   return new ShowExtrasCommand;
@@ -223,4 +242,9 @@ Command* CommandFactory::createShowSlicesCommand()
   return new ShowSlicesCommand;
 }
 
+Command* CommandFactory::createShowTileNumbersCommand()
+{
+  return new ShowTileNumbersCommand;
+}
+
 } // namespace app

src/app/commands/commands_list.h

@@ -150,6 +150,7 @@ FOR_EACH_COMMAND(ShowOnionSkin)
 FOR_EACH_COMMAND(ShowPixelGrid)
 FOR_EACH_COMMAND(ShowSelectionEdges)
 FOR_EACH_COMMAND(ShowSlices)
+FOR_EACH_COMMAND(ShowTileNumbers)
 FOR_EACH_COMMAND(SliceProperties)
 FOR_EACH_COMMAND(SnapToGrid)
 FOR_EACH_COMMAND(SpriteProperties)

src/app/ui/editor/editor.cpp

@@ -915,9 +915,39 @@ void Editor::drawSpriteUnclippedRect(ui::Graphics* g, const gfx::Rect& _rc)
       m_state->requireBrushPreview()) {
     Cel* cel = (m_layer ? m_layer->cel(m_frame): nullptr);
     if (cel) {
-      drawCelBounds(
+      gfx::Color color = color_utils::color_for_ui(Preferences::instance().guides.layerEdgesColor());
-        g, cel,
+      drawCelBounds(g, cel, color);
-        color_utils::color_for_ui(Preferences::instance().guides.layerEdgesColor()));
+
+      // Draw tile numbers
+      if (m_docPref.show.tileNumbers() &&
+          cel->layer()->isTilemap()) {
+        color = color_utils::color_for_ui(Preferences::instance().guides.autoGuidesColor());
+        gfx::Color fgColor = color_utils::blackandwhite_neg(color);
+
+        const doc::Grid grid = getSite().grid();
+        const gfx::Size tileSize = editorToScreen(grid.tileToCanvas(gfx::Rect(0, 0, 1, 1))).size();
+        if (tileSize.h > g->font()->height()) {
+          const gfx::Point offset(tileSize.w/2,
+                                  tileSize.h/2 - g->font()->height()/2);
+          const gfx::Rect rc = cel->bounds();
+          const doc::Image* image = cel->image();
+          std::string text;
+          for (int y=0; y<image->height(); ++y) {
+            for (int x=0; x<image->width(); ++x) {
+              doc::tile_t t = image->getPixel(x, y);
+              if (t != doc::tile_i_notile) {
+                gfx::Point pt = editorToScreen(grid.tileToCanvas(gfx::Point(x, y)));
+                pt -= bounds().origin();
+                pt += offset;
+
+                text = fmt::format("{}", (t & doc::tile_i_mask));
+                pt.x -= g->measureUIText(text).w/2;
+                g->drawText(text, fgColor, color, pt);
+              }
+            }
+          }
+        }
+      }
 
       if (m_showAutoCelGuides &&
           m_showGuidesThisCel != cel) {
@@ -1157,9 +1187,8 @@ void Editor::drawCelGuides(ui::Graphics* g, const Cel* cel, const Cel* mouseCel)
     scrCmpBounds = getCelScreenBounds(mouseCel);
     sprCmpBounds = mouseCel->bounds();
 
-    drawCelBounds(
+    const gfx::Color color = color_utils::color_for_ui(Preferences::instance().guides.autoGuidesColor());
-      g, mouseCel,
+    drawCelBounds(g, mouseCel, color);
-      color_utils::color_for_ui(Preferences::instance().guides.autoGuidesColor()));
   }
   // Use whole canvas
   else {