feat: 优化 overlay_pixels

src/paint.rs

@@ -13,7 +13,7 @@ use iced::{color, event, mouse};
 use crate::color_box::{ColorSelectionBox, CurrentColorBox};
 use crate::image_button::image_button;
 use crate::mouse_area::mouse_area;
-use crate::mscanvas::{MSCanvas, MSColor};
+use crate::mscanvas::{MSCanvas, MSColor, RectSelection};
 
 const WIDTH: u32 = 800;
 const HEIGHT: u32 = 600;
@@ -51,12 +51,44 @@ impl std::fmt::Display for BrushKind {
     }
 }
 
+#[derive(Debug, Clone, Copy, PartialEq)]
+enum ShapeStyle {
+    Stroke,
+    Fill,
+    FillAndStroke,
+}
+
+impl ShapeStyle {
+    const ALL: [ShapeStyle; 3] = [
+        ShapeStyle::Stroke,
+        ShapeStyle::Fill,
+        ShapeStyle::FillAndStroke,
+    ];
+}
+
+impl std::fmt::Display for ShapeStyle {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                ShapeStyle::Stroke => "Stroke",
+                ShapeStyle::Fill => "Fill",
+                ShapeStyle::FillAndStroke => "FillAndStroke",
+            }
+        )
+    }
+}
+
+#[allow(unused)]
 #[derive(Debug, Clone, Copy)]
 enum Message {
     MousePressed(Point),
     MouseReleased(Point),
     MouseMoved(Point),
     MouseDoubleClick(Point),
+    MouseRightPressed(Point),
+    MouseRightReleased(Point),
 
     Clear,
     SavePNG,
@@ -69,6 +101,7 @@ enum Message {
     Decrement(ConfigOption),
 
     BrushSelected(BrushKind),
+    ShapeStyleSelected(ShapeStyle),
 
     /// 全局鼠标释放
     WindowMouseRelease,
@@ -194,6 +227,8 @@ struct Config {
     airbrush_radius: i32,
     airbrush_density: i32,
     rounded_radius: i32,
+    brush_kind: Option<BrushKind>,
+    shape_style: Option<ShapeStyle>,
 }
 
 impl Default for Config {
@@ -209,7 +244,10 @@ impl Config {
         airbrush_radius: 4,
         airbrush_density: 16,
         rounded_radius: 3,
+        brush_kind: None,
+        shape_style: None,
     };
+
     fn incr(&mut self, option: ConfigOption, step: i32) {
         match option {
             ConfigOption::EraserWidth => {
@@ -244,6 +282,14 @@ impl Config {
             }
         }
     }
+
+    fn set_brush_kind(&mut self, kind: BrushKind) {
+        self.brush_kind = Some(kind);
+    }
+
+    fn set_shape_style(&mut self, shape_style: ShapeStyle) {
+        self.shape_style = Some(shape_style);
+    }
 }
 
 #[derive(Debug, Clone, Copy, PartialEq)]
@@ -257,8 +303,12 @@ enum ControlState {
 struct PaintApp {
     tool_states: [bool; Tool::Count as usize],
     tool_selected: Tool,
+    prev_tool_selected: Tool,
 
+    /// 画图层
     canvas: MSCanvas,
+    /// 显示层
+    view_canvas: MSCanvas,
 
     /// 是否正在绘制
     is_drawing: bool,
@@ -281,25 +331,33 @@ struct PaintApp {
 
     config: Config,
 
-    brush_selected: Option<BrushKind>,
-
     foreground_color: MSColor,
     background_color: MSColor,
+
+    rect_selection: Option<RectSelection>,
 }
 
 impl PaintApp {
     // region iced application
 
     pub fn new() -> Self {
-        let mut canvas = MSCanvas::new(WIDTH as i32, HEIGHT as i32);
+        let canvas = MSCanvas::new(WIDTH as i32, HEIGHT as i32);
         let (width, height) = canvas.size();
         let pixels = canvas.get_pixels();
-        let config = Config::default();
+
-        canvas.set_line_width(config.line_width);
+        let mut view_canvas = MSCanvas::new(width, height);
-        Self {
+        view_canvas.clear_zero();
+        view_canvas
+            .fill_color(MSColor::WHITE)
+            .stroke_color(MSColor::BLACK)
+            .line_width(1);
+
+        let mut ins = Self {
             tool_states: [false; Tool::Count as usize],
             tool_selected: Tool::Count,
+            prev_tool_selected: Tool::Count,
             canvas,
+            view_canvas,
             is_drawing: false,
             begin_point: Point::ORIGIN,
             end_point: Point::ORIGIN,
@@ -307,11 +365,25 @@ impl PaintApp {
             control_points: Vec::with_capacity(2),
             image_handle: image::Handle::from_rgba(width as u32, height as u32, pixels),
             dirty: false,
-            config,
+            config: Config::default(),
-            brush_selected: None,
             foreground_color: MSColor::BLACK,
             background_color: MSColor::WHITE,
-        }
+            rect_selection: None,
+        };
+
+        ins.canvas
+            .fill_color(ins.foreground_color)
+            .stroke_color(ins.foreground_color)
+            .line_width(ins.config.line_width);
+
+        ins.view_canvas
+            .fill_color(MSColor::BLACK)
+            .stroke_color(MSColor::BLACK)
+            .line_width(1);
+
+        ins.update_tool_states(Tool::Pencil);
+
+        ins
     }
 
     pub fn view(&self) -> Column<'_, Message> {
@@ -322,10 +394,12 @@ impl PaintApp {
             .height(Length::Fixed(height as f32));
 
         let canvas_area = mouse_area(image_widget)
-            .on_press(|pos| Message::MousePressed(pos)) // 占位，实际逻辑在 on_drag 或自定义
+            .on_press(|pos| Message::MousePressed(pos))
             .on_release(|pos| Message::MouseReleased(pos))
             .on_move(|pos| Message::MouseMoved(pos))
-            .on_double_click(|pos| Message::MouseDoubleClick(pos));
+            .on_double_click(|pos| Message::MouseDoubleClick(pos))
+            .on_right_press(|pos| Message::MouseRightPressed(pos))
+            .on_right_release(|pos| Message::MouseRightReleased(pos));
         // 注意：mouse_area 的 on_move 给出的坐标通常是相对于 widget 左上角的，这正是我们需要的！
         let canvas_area = container(canvas_area)
             .width(Length::Fill)
@@ -470,7 +544,7 @@ impl PaintApp {
             .padding(padding::right(5)),
             pick_list(
                 &BrushKind::ALL[..],
-                self.brush_selected,
+                self.config.brush_kind,
                 Message::BrushSelected,
             )
             .placeholder("Brush..."),
@@ -501,6 +575,12 @@ impl PaintApp {
                 ],
             ]
             .padding(padding::right(5)),
+            pick_list(
+                &ShapeStyle::ALL[..],
+                self.config.shape_style,
+                Message::ShapeStyleSelected,
+            )
+            .placeholder("Shape Style..."),
         ];
         debug_area = debug_area.padding(padding::top(10).left(5).bottom(10));
 
@@ -517,12 +597,18 @@ impl PaintApp {
 
     pub fn update(&mut self, message: Message) -> Task<Message> {
         match self.tool_selected {
+            Tool::Select => {
+                self.update_with_select(message);
+            }
             Tool::Eraser => {
                 self.update_with_eraser(message);
             }
             Tool::FillWithColor => {
                 self.update_with_fill_with_color(message);
             }
+            Tool::PickColor => {
+                self.update_with_pick_color(message);
+            }
             Tool::Pencil => {
                 self.update_with_pencil(message);
             }
@@ -577,17 +663,20 @@ impl PaintApp {
             Message::Increment(opt) => {
                 self.config.incr(opt, 1);
                 if opt == ConfigOption::LineWidth {
-                    self.canvas.set_line_width(self.config.line_width);
+                    self.canvas.line_width(self.config.line_width);
                 }
             }
             Message::Decrement(opt) => {
                 self.config.incr(opt, -1);
                 if opt == ConfigOption::LineWidth {
-                    self.canvas.set_line_width(self.config.line_width);
+                    self.canvas.line_width(self.config.line_width);
                 }
             }
             Message::BrushSelected(kind) => {
-                self.brush_selected = Some(kind);
+                self.config.set_brush_kind(kind);
+            }
+            Message::ShapeStyleSelected(kind) => {
+                self.config.set_shape_style(kind);
             }
             Message::WindowMouseRelease => {
                 // 处理鼠标在 canvas_area 外面释放
@@ -605,18 +694,18 @@ impl PaintApp {
             }
             Message::ClickForegroundColor(color) => {
                 self.foreground_color = color;
-                self.canvas.set_foreground_color(color);
+                self.canvas.stroke_color(color);
+                self.canvas.fill_color(color);
             }
             Message::ClickBackgroundColor(color) => {
                 self.background_color = color;
-                self.canvas.set_background_color(color);
             }
             Message::SwapForeBackColor => {
                 let tmp = self.foreground_color;
                 self.foreground_color = self.background_color;
                 self.background_color = tmp;
-                self.canvas.set_foreground_color(self.foreground_color);
+                self.canvas.stroke_color(self.foreground_color);
-                self.canvas.set_background_color(self.background_color);
+                self.canvas.fill_color(self.foreground_color);
             }
             _ => {}
         }
@@ -648,6 +737,167 @@ impl PaintApp {
 
     // region tool update
 
+    fn draw_rect_selection(&mut self, x: i32, y: i32) {
+        if self.rect_selection.is_none() {
+            return;
+        }
+        let rect_selection = self.rect_selection.as_ref().unwrap();
+        let (width, height) = rect_selection.size();
+        self.view_canvas.draw_rect_selection(x, y, rect_selection);
+        self.view_canvas
+            .stroke_dashed_rect(x, y, width, height, 1, 1);
+        // 画矩形四条边上的三个点
+        {
+            let sw = 3;
+            let half_sw = sw / 2;
+            self.view_canvas.fill_rect(x - half_sw, y - half_sw, sw, sw);
+            self.view_canvas
+                .fill_rect((x + width / 2) - half_sw, y - half_sw, sw, sw);
+            self.view_canvas
+                .fill_rect((x + width - 1) - half_sw, y - half_sw, sw, sw);
+            self.view_canvas
+                .fill_rect(x - half_sw, (y + height / 2) - half_sw, sw, sw);
+            self.view_canvas.fill_rect(
+                (x + width - 1) - half_sw,
+                (y + height / 2) - half_sw,
+                sw,
+                sw,
+            );
+            self.view_canvas
+                .fill_rect(x - half_sw, (y + height - 1) - half_sw, sw, sw);
+            self.view_canvas.fill_rect(
+                (x + width / 2) - half_sw,
+                (y + height - 1) - half_sw,
+                sw,
+                sw,
+            );
+            self.view_canvas.fill_rect(
+                (x + width - 1) - half_sw,
+                (y + height - 1) - half_sw,
+                sw,
+                sw,
+            );
+        }
+    }
+
+    fn release_rect_selection(&mut self) {
+        if self.rect_selection.is_none() {
+            return;
+        }
+        let rect_selection = self.rect_selection.as_ref().unwrap();
+        let (x, y) = rect_selection.position();
+        self.view_canvas.restore_pixels();
+        self.canvas.restore_pixels();
+        self.canvas.draw_rect_selection(x, y, rect_selection);
+        self.dirty = true;
+
+        self.rect_selection = None;
+    }
+
+    pub fn update_with_select(&mut self, message: Message) {
+        match message {
+            Message::MousePressed(pos) => match self.control_state {
+                ControlState::Zero => {
+                    self.is_drawing = true;
+                    self.view_canvas.save_pixels();
+                    self.begin_point = pos;
+                    self.control_state = ControlState::One;
+                }
+                ControlState::One => {
+                    if let Some(rect_selection) = self.rect_selection.as_ref() {
+                        if rect_selection.contains(pos) {
+                            self.is_drawing = true;
+                            self.begin_point = pos;
+                            self.control_state = ControlState::Two;
+                        } else {
+                            self.release_rect_selection();
+                            self.is_drawing = true;
+                            self.view_canvas.save_pixels();
+                            self.begin_point = pos;
+                            self.control_state = ControlState::One;
+                        }
+                    }
+                }
+                _ => {}
+            },
+            Message::MouseReleased(pos) => {
+                self.is_drawing = false;
+                match self.control_state {
+                    ControlState::One => {
+                        self.view_canvas.restore_pixels();
+                        let p1 = self.begin_point;
+                        let p2 = pos;
+                        let mut x = p1.x;
+                        let mut y = p1.y;
+                        let mut width = p2.x - p1.x;
+                        let mut height = p2.y - p1.y;
+                        if width < 1.0 || height < 1.0 {
+                            self.control_state = ControlState::Zero;
+                            return;
+                        }
+                        if width < 0.0 && height < 0.0 {
+                            x = p2.x;
+                            y = p2.y;
+                            width = p1.x - p2.x;
+                            height = p1.y - p2.y;
+                        } else if width < 0.0 {
+                            x += width;
+                            width = -width;
+                        } else if height < 0.0 {
+                            y += height;
+                            height = -height;
+                        }
+                        self.rect_selection = Some(self.canvas.select_rect(
+                            x as i32,
+                            y as i32,
+                            width as i32,
+                            height as i32,
+                        ));
+                        self.canvas
+                            .clear_rect(x as i32, y as i32, width as i32, height as i32);
+                        self.canvas.save_pixels();
+                        self.draw_rect_selection(x as i32, y as i32);
+                        self.begin_point = pos;
+                        self.dirty = true;
+                    }
+                    ControlState::Two => {
+                        self.control_state = ControlState::One;
+                        if let Some(rect_selection) = self.rect_selection.as_mut() {
+                            let offset_x = pos.x - self.begin_point.x;
+                            let offset_y = pos.y - self.begin_point.y;
+                            rect_selection.move_offset(offset_x as i32, offset_y as i32);
+                        }
+                    }
+                    _ => {}
+                }
+            }
+            Message::MouseMoved(pos) => {
+                if self.is_drawing {
+                    match self.control_state {
+                        ControlState::One => {
+                            self.view_canvas.restore_pixels();
+                            self.view_canvas
+                                .stroke_dashed_rect1(self.begin_point, pos, 3, 1);
+                            self.dirty = true;
+                        }
+                        ControlState::Two => {
+                            if let Some(rect_selection) = self.rect_selection.as_ref() {
+                                let offset_x = pos.x - self.begin_point.x;
+                                let offset_y = pos.y - self.begin_point.y;
+                                let (x, y) = rect_selection.position();
+                                self.view_canvas.restore_pixels();
+                                self.draw_rect_selection(x + offset_x as i32, y + offset_y as i32);
+                                self.dirty = true;
+                            }
+                        }
+                        _ => {}
+                    }
+                }
+            }
+            _ => {}
+        }
+    }
+
     pub fn update_with_eraser(&mut self, message: Message) {
         match message {
             Message::MousePressed(pos) => {
@@ -673,6 +923,20 @@ impl PaintApp {
                     );
                     self.dirty = true;
                 }
+                self.view_canvas.clear_zero();
+                self.view_canvas.clear_rect(
+                    (pos.x as i32) - self.config.eraser_width / 2,
+                    (pos.y as i32) - self.config.eraser_width / 2,
+                    self.config.eraser_width,
+                    self.config.eraser_width,
+                );
+                self.view_canvas.stroke_rect(
+                    (pos.x as i32) - self.config.eraser_width / 2,
+                    (pos.y as i32) - self.config.eraser_width / 2,
+                    self.config.eraser_width,
+                    self.config.eraser_width,
+                );
+                self.dirty = true;
             }
             _ => {}
         }
@@ -688,11 +952,35 @@ impl PaintApp {
         }
     }
 
+    pub fn update_with_pick_color(&mut self, message: Message) {
+        match message {
+            Message::MousePressed(pos) => {
+                let color_option = self.canvas.pixel_at(pos.x as i32, pos.y as i32);
+                if let Some(color) = color_option {
+                    self.foreground_color = color;
+                    self.canvas.stroke_color(color);
+                    self.canvas.fill_color(color);
+                }
+            }
+            Message::MouseRightPressed(pos) => {
+                let color_option = self.canvas.pixel_at(pos.x as i32, pos.y as i32);
+                if let Some(color) = color_option {
+                    self.background_color = color;
+                }
+            }
+            Message::MouseReleased(_) | Message::MouseRightReleased(_) => {
+                self.update_tool_states(self.prev_tool_selected);
+            }
+
+            _ => {}
+        }
+    }
+
     pub fn update_with_pencil(&mut self, message: Message) {
         match message {
             Message::MousePressed(pos) => {
                 self.is_drawing = true;
-                self.canvas.draw_pixel_at(pos);
+                self.canvas.fill_pixel_at(pos);
                 self.begin_point = pos;
                 self.dirty = true;
             }
@@ -712,15 +1000,12 @@ impl PaintApp {
     }
 
     pub fn update_with_brush(&mut self, message: Message) {
-        let mut brush_fn: fn(&mut MSCanvas, Point) = MSCanvas::brush_circle;
+        let brush_fn = match self.get_brush_kind() {
-        if let Some(kind) = self.brush_selected {
+            BrushKind::Circle => MSCanvas::brush_circle,
-            brush_fn = match kind {
+            BrushKind::Square => MSCanvas::brush_square,
-                BrushKind::Circle => MSCanvas::brush_circle,
+            BrushKind::Slash => MSCanvas::brush_slash,
-                BrushKind::Square => MSCanvas::brush_square,
+            BrushKind::Backslash => MSCanvas::brush_backslash,
-                BrushKind::Slash => MSCanvas::brush_slash,
+        };
-                BrushKind::Backslash => MSCanvas::brush_backslash,
-            }
-        }
         match message {
             Message::MousePressed(pos) => {
                 self.is_drawing = true;
@@ -894,7 +1179,20 @@ impl PaintApp {
             Message::MouseMoved(pos) => {
                 if self.is_drawing {
                     self.canvas.restore_pixels();
-                    self.canvas.rect1(self.begin_point, pos);
+                    match self.get_shape_style() {
+                        ShapeStyle::Stroke => {
+                            self.canvas.stroke_rect1(self.begin_point, pos);
+                        }
+                        ShapeStyle::Fill => {
+                            self.canvas.fill_rect1(self.begin_point, pos);
+                        }
+                        ShapeStyle::FillAndStroke => {
+                            self.canvas.fill_color(self.background_color);
+                            self.canvas.fill_rect1(self.begin_point, pos);
+                            self.canvas.fill_color(self.foreground_color);
+                            self.canvas.stroke_rect1(self.begin_point, pos);
+                        }
+                    }
                     self.dirty = true;
                 }
             }
@@ -902,6 +1200,25 @@ impl PaintApp {
         }
     }
 
+    fn close_polygon(&mut self) {
+        self.canvas.close_path();
+        match self.get_shape_style() {
+            ShapeStyle::Stroke => {
+                self.canvas.stroke();
+            }
+            ShapeStyle::Fill => {
+                self.canvas.fill();
+            }
+            ShapeStyle::FillAndStroke => {
+                self.canvas.fill_color(self.background_color);
+                self.canvas.fill();
+                self.canvas.fill_color(self.foreground_color);
+                self.canvas.stroke();
+            }
+        }
+        self.dirty = true;
+    }
+
     pub fn update_with_polygon(&mut self, message: Message) {
         match message {
             Message::MousePressed(pos) => match self.control_state {
@@ -938,11 +1255,9 @@ impl PaintApp {
                 }
             }
             Message::MouseDoubleClick(_pos) => {
-                self.canvas.close_path();
-                self.canvas.stroke();
                 self.is_drawing = false;
                 self.control_state = ControlState::Zero;
-                self.dirty = true;
+                self.close_polygon();
             }
             _ => {}
         }
@@ -962,7 +1277,20 @@ impl PaintApp {
             Message::MouseMoved(pos) => {
                 if self.is_drawing {
                     self.canvas.restore_pixels();
-                    self.canvas.ellipse1(self.begin_point, pos);
+                    match self.get_shape_style() {
+                        ShapeStyle::Stroke => {
+                            self.canvas.stroke_ellipse1(self.begin_point, pos);
+                        }
+                        ShapeStyle::Fill => {
+                            self.canvas.fill_ellipse1(self.begin_point, pos);
+                        }
+                        ShapeStyle::FillAndStroke => {
+                            self.canvas.fill_color(self.background_color);
+                            self.canvas.fill_ellipse1(self.begin_point, pos);
+                            self.canvas.fill_color(self.foreground_color);
+                            self.canvas.stroke_ellipse1(self.begin_point, pos);
+                        }
+                    }
                     self.dirty = true;
                 }
             }
@@ -984,11 +1312,36 @@ impl PaintApp {
             Message::MouseMoved(pos) => {
                 if self.is_drawing {
                     self.canvas.restore_pixels();
-                    self.canvas.round_rect1(
+                    match self.get_shape_style() {
-                        self.begin_point,
+                        ShapeStyle::Stroke => {
-                        pos,
+                            self.canvas.stroke_round_rect1(
-                        self.config.rounded_radius as f32,
+                                self.begin_point,
-                    );
+                                pos,
+                                self.config.rounded_radius as f32,
+                            );
+                        }
+                        ShapeStyle::Fill => {
+                            self.canvas.fill_round_rect1(
+                                self.begin_point,
+                                pos,
+                                self.config.rounded_radius as f32,
+                            );
+                        }
+                        ShapeStyle::FillAndStroke => {
+                            self.canvas.fill_color(self.background_color);
+                            self.canvas.fill_round_rect1(
+                                self.begin_point,
+                                pos,
+                                self.config.rounded_radius as f32,
+                            );
+                            self.canvas.fill_color(self.foreground_color);
+                            self.canvas.stroke_round_rect1(
+                                self.begin_point,
+                                pos,
+                                self.config.rounded_radius as f32,
+                            );
+                        }
+                    }
                     self.dirty = true;
                 }
             }
@@ -998,16 +1351,35 @@ impl PaintApp {
 
     // endregion
 
+    fn get_shape_style(&self) -> ShapeStyle {
+        self.config.shape_style.unwrap_or(ShapeStyle::Stroke)
+    }
+
+    fn get_brush_kind(&self) -> BrushKind {
+        self.config.brush_kind.unwrap_or(BrushKind::Circle)
+    }
+
     pub fn update_tool_states(&mut self, tool: Tool) {
         let idx = tool as usize;
         if idx >= self.tool_states.len() {
             return;
         }
-        if self.tool_selected == Tool::Polygon {
+        if self.tool_selected == Tool::Polygon && self.control_state != ControlState::Zero {
             // 切换到其他工具，闭合路径
-            self.canvas.close_path();
+            self.close_polygon();
-            self.canvas.stroke();
+        }
-            self.dirty = true;
+        if self.tool_selected == Tool::Select && self.control_state != ControlState::Zero {
+            // 切换到其他工具，释放选择框
+            self.release_rect_selection();
+        }
+
+        self.is_drawing = false;
+        self.control_state = ControlState::Zero;
+        self.view_canvas.clear_zero();
+        self.dirty = true;
+
+        if self.tool_selected == idx.into() {
+            return;
         }
 
         let old_value = self.tool_states[idx];
@@ -1015,19 +1387,19 @@ impl PaintApp {
             self.tool_states[i] = false;
         }
         self.tool_states[idx] = !old_value;
+        self.prev_tool_selected = self.tool_selected;
         self.tool_selected = idx.into();
-
-        self.is_drawing = false;
-        self.control_state = ControlState::Zero;
     }
 
     /// 将原始字节转换为 Iced 的图像句柄
     fn update_image_handle(&mut self) {
         // 克隆数据以避免所有权问题，或者使用 Arc 如果数据量大
         // 这里为了简单直接 clone，对于 800x600 (约 2MB) 来说很快
-        let data = self.canvas.get_pixels();
+        // let data = self.canvas.get_pixels();
+        let data = self.view_canvas.overlay_pixels(&self.canvas);
+        let (width, height) = self.canvas.size();
 
-        self.image_handle = image::Handle::from_rgba(WIDTH, HEIGHT, data);
+        self.image_handle = image::Handle::from_rgba(width as u32, height as u32, data);
     }
 }