Changed behavior of flip image to make it work as expected with selections

The selection itself also gets flipped, if there is any

src/Classes/ImageEffect.gd

@@ -47,49 +47,44 @@ func _about_to_show() -> void:
 func _confirmed() -> void:
 	var project: Project = Global.current_project
 	if affect == CEL:
-		# No changes if the layer is locked or invisible
-		if !project.layers[project.current_layer].can_layer_get_drawn():
-			return
-		if project.selected_cels.size() == 1:
-			Global.canvas.handle_undo("Draw")
-			commit_action(current_cel)
-			Global.canvas.handle_redo("Draw")
-		else:
-			Global.canvas.handle_undo("Draw", project, -1, -1)
-			for cel_index in project.selected_cels:
-				var cel: Cel = project.frames[cel_index[0]].cels[cel_index[1]]
-				var cel_image: Image = cel.image
-				commit_action(cel_image)
-			Global.canvas.handle_redo("Draw", project, -1, -1)
+		var undo_data := _get_undo_data(project)
+		for cel_index in project.selected_cels:
+			if !project.layers[cel_index[1]].can_layer_get_drawn():
+				continue
+			var cel: Cel = project.frames[cel_index[0]].cels[cel_index[1]]
+			var cel_image: Image = cel.image
+			commit_action(cel_image)
+		_commit_undo("Draw", undo_data, project)
+
 	elif affect == FRAME:
-		Global.canvas.handle_undo("Draw", project, -1)
+		var undo_data := _get_undo_data(project)
 		var i := 0
 		for cel in project.frames[project.current_frame].cels:
 			if project.layers[i].can_layer_get_drawn():
 				commit_action(cel.image)
 			i += 1
-		Global.canvas.handle_redo("Draw", project, -1)
+		_commit_undo("Draw", undo_data, project)
 
 	elif affect == ALL_FRAMES:
-		Global.canvas.handle_undo("Draw", project, -1, -1)
+		var undo_data := _get_undo_data(project)
 		for frame in project.frames:
 			var i := 0
 			for cel in frame.cels:
 				if project.layers[i].can_layer_get_drawn():
 					commit_action(cel.image)
 				i += 1
-		Global.canvas.handle_redo("Draw", project, -1, -1)
+		_commit_undo("Draw", undo_data, project)
 
 	elif affect == ALL_PROJECTS:
 		for _project in Global.projects:
-			Global.canvas.handle_undo("Draw", _project, -1, -1)
+			var undo_data := _get_undo_data(_project)
 			for frame in _project.frames:
 				var i := 0
 				for cel in frame.cels:
 					if _project.layers[i].can_layer_get_drawn():
 						commit_action(cel.image, _project)
 					i += 1
-			Global.canvas.handle_redo("Draw", _project, -1, -1)
+			_commit_undo("Draw", undo_data, _project)
 
 
 func commit_action(_cel: Image, _project: Project = Global.current_project) -> void:
@@ -100,6 +95,42 @@ func set_nodes() -> void:
 	pass
 
 
+func _commit_undo(action: String, undo_data: Dictionary, project: Project) -> void:
+	var redo_data := _get_undo_data(project)
+
+	project.undos += 1
+	project.undo_redo.create_action(action)
+	for image in redo_data:
+		project.undo_redo.add_do_property(image, "data", redo_data[image])
+	for image in undo_data:
+		project.undo_redo.add_undo_property(image, "data", undo_data[image])
+	project.undo_redo.add_do_method(Global, "redo", -1, -1, project)
+	project.undo_redo.add_undo_method(Global, "undo", -1, -1, project)
+	project.undo_redo.commit_action()
+
+
+func _get_undo_data(project: Project) -> Dictionary:
+	var data := {}
+	var images := _get_selected_draw_images(project)
+	for image in images:
+		image.unlock()
+		data[image] = image.data
+	return data
+
+
+func _get_selected_draw_images(project: Project) -> Array:  # Array of Images
+	var images := []
+	if affect == CEL:
+		for cel_index in project.selected_cels:
+			var cel: Cel = project.frames[cel_index[0]].cels[cel_index[1]]
+			images.append(cel.image)
+	else:
+		for frame in project.frames:
+			for cel in frame.cels:
+				images.append(cel.image)
+	return images
+
+
 func _on_SelectionCheckBox_toggled(_button_pressed: bool) -> void:
 	update_preview()
 
@@ -124,8 +155,8 @@ func update_preview() -> void:
 func update_transparent_background_size() -> void:
 	if !preview:
 		return
-	var image_size_y = preview.rect_size.y
-	var image_size_x = preview.rect_size.x
+	var image_size_y := preview.rect_size.y
+	var image_size_x := preview.rect_size.x
 	if preview_image.get_size().x > preview_image.get_size().y:
 		var scale_ratio = preview_image.get_size().x / image_size_x
 		image_size_y = preview_image.get_size().y / scale_ratio

src/Classes/ShaderImageEffect.gd

@@ -45,7 +45,5 @@ func generate_image(
 	VisualServer.free_rid(ci_rid)
 	VisualServer.free_rid(mat_rid)
 	viewport_texture.convert(Image.FORMAT_RGBA8)
-	#Global.canvas.handle_undo("Draw")
 	_img.copy_from(viewport_texture)
-	#Global.canvas.handle_redo("Draw")
 	emit_signal("done")

src/UI/Dialogs/ImageEffects/FlipImageDialog.gd

@@ -10,8 +10,8 @@ func set_nodes() -> void:
 	affect_option_button = $VBoxContainer/OptionsContainer/AffectOptionButton
 
 
-func commit_action(_cel: Image, project: Project = Global.current_project) -> void:
-	flip_image(_cel, selection_checkbox.pressed, project)
+func commit_action(cel: Image, project: Project = Global.current_project) -> void:
+	_flip_image(cel, selection_checkbox.pressed, project)
 
 
 func _on_FlipHorizontal_toggled(_button_pressed: bool) -> void:
@@ -22,35 +22,98 @@ func _on_FlipVertical_toggled(_button_pressed: bool) -> void:
 	update_preview()
 
 
-func flip_image(img: Image, affect_selection: bool, proj: Project = Global.current_project) -> void:
-	if !(affect_selection and proj.has_selection):
+func _flip_image(cel: Image, affect_selection: bool, project: Project) -> void:
+	if !(affect_selection and project.has_selection):
 		if flip_h.pressed:
-			img.flip_x()
+			cel.flip_x()
 		if flip_v.pressed:
-			img.flip_y()
+			cel.flip_y()
 	else:
 		# Create a temporary image that only has the selected pixels in it
-		var selected_image := Image.new()
-		selected_image.create(img.get_width(), img.get_height(), false, Image.FORMAT_RGBA8)
-		selected_image.lock()
-		img.lock()
-		for x in img.get_width():
-			for y in img.get_width():
+		var selected := Image.new()
+		var rectangle: Rect2 = Global.canvas.selection.big_bounding_rectangle
+		if project != Global.current_project:
+			rectangle = project.get_selection_rectangle()
+		selected = cel.get_rect(rectangle)
+		selected.lock()
+		cel.lock()
+		for x in selected.get_width():
+			for y in selected.get_height():
 				var pos := Vector2(x, y)
-				if proj.can_pixel_get_drawn(pos):
-					var color: Color = img.get_pixelv(pos)
-					selected_image.set_pixelv(pos, color)
-					img.set_pixelv(pos, Color(0, 0, 0, 0))
+				var cel_pos := pos + rectangle.position
+				if project.can_pixel_get_drawn(cel_pos):
+					cel.set_pixelv(cel_pos, Color(0, 0, 0, 0))
+				else:
+					selected.set_pixelv(pos, Color(0, 0, 0, 0))
 
+		selected.unlock()
+		cel.unlock()
 		if flip_h.pressed:
-			selected_image.flip_x()
+			selected.flip_x()
 		if flip_v.pressed:
-			selected_image.flip_y()
-		selected_image.unlock()
-		img.blit_rect_mask(
-			selected_image,
-			selected_image,
-			Rect2(Vector2.ZERO, selected_image.get_size()),
-			Vector2.ZERO
-		)
-		img.unlock()
+			selected.flip_y()
+		cel.blend_rect(selected, Rect2(Vector2.ZERO, selected.get_size()), rectangle.position)
+
+
+func _commit_undo(action: String, undo_data: Dictionary, project: Project) -> void:
+	_flip_selection(project)
+
+	var redo_data := _get_undo_data(project)
+	project.undos += 1
+	project.undo_redo.create_action(action)
+	project.undo_redo.add_do_property(project, "selection_bitmap", redo_data["selection_bitmap"])
+	project.undo_redo.add_do_property(project, "selection_offset", redo_data["outline_offset"])
+	project.undo_redo.add_undo_property(project, "selection_bitmap", undo_data["selection_bitmap"])
+	project.undo_redo.add_undo_property(project, "selection_offset", undo_data["outline_offset"])
+
+	for image in redo_data:
+		if not image is Image:
+			continue
+		project.undo_redo.add_do_property(image, "data", redo_data[image])
+		image.unlock()
+	for image in undo_data:
+		if not image is Image:
+			continue
+		project.undo_redo.add_undo_property(image, "data", undo_data[image])
+	project.undo_redo.add_do_method(Global, "redo", -1, -1, project)
+	project.undo_redo.add_do_method(project, "selection_bitmap_changed")
+	project.undo_redo.add_undo_method(Global, "undo", -1, -1, project)
+	project.undo_redo.add_undo_method(project, "selection_bitmap_changed")
+	project.undo_redo.commit_action()
+
+
+func _get_undo_data(project: Project) -> Dictionary:
+	var data := {}
+	data["selection_bitmap"] = project.selection_bitmap.duplicate()
+	data["outline_offset"] = project.selection_offset
+
+	var images := _get_selected_draw_images(project)
+	for image in images:
+		image.unlock()
+		data[image] = image.data
+
+	return data
+
+
+func _flip_selection(project: Project = Global.current_project) -> void:
+	if !(selection_checkbox.pressed and project.has_selection):
+		return
+
+	var bitmap_image: Image = project.bitmap_to_image(project.selection_bitmap)
+	var selection_rect := bitmap_image.get_used_rect()
+	var smaller_bitmap_image := bitmap_image.get_rect(selection_rect)
+
+	if flip_h.pressed:
+		smaller_bitmap_image.flip_x()
+	if flip_v.pressed:
+		smaller_bitmap_image.flip_y()
+
+	bitmap_image.fill(Color(0, 0, 0, 0))
+	bitmap_image.blend_rect(
+		smaller_bitmap_image,
+		Rect2(Vector2.ZERO, smaller_bitmap_image.get_size()),
+		selection_rect.position
+	)
+	var bitmap_copy: BitMap = project.selection_bitmap.duplicate()
+	bitmap_copy.create_from_image_alpha(bitmap_image)
+	project.selection_bitmap = bitmap_copy