| 1 | //! Blur tool - pixelate regions for redaction. |
| 2 | |
| 3 | use super::Tool; |
| 4 | use crate::annotate::state::ToolProperties; |
| 5 | use gartk_core::{InputEvent, MouseButton, Point, Rect}; |
| 6 | use gartk_render::cairo::Context; |
| 7 | use gartk_render::stroke_rect; |
| 8 | use gartk_x11::CursorShape; |
| 9 | |
| 10 | /// Blur/pixelate tool for redacting sensitive information. |
| 11 | pub struct BlurTool { |
| 12 | /// Starting corner of the region. |
| 13 | start: Option<Point>, |
| 14 | /// Opposite corner of the region. |
| 15 | end: Option<Point>, |
| 16 | /// Whether we're currently drawing. |
| 17 | drawing: bool, |
| 18 | } |
| 19 | |
| 20 | impl BlurTool { |
| 21 | /// Create a new blur tool. |
| 22 | pub fn new() -> Self { |
| 23 | Self { |
| 24 | start: None, |
| 25 | end: None, |
| 26 | drawing: false, |
| 27 | } |
| 28 | } |
| 29 | |
| 30 | /// Calculate normalized rectangle from start and end points. |
| 31 | pub fn calculate_rect(&self) -> Option<Rect> { |
| 32 | let (start, end) = (self.start?, self.end?); |
| 33 | |
| 34 | let x = start.x.min(end.x); |
| 35 | let y = start.y.min(end.y); |
| 36 | let width = (end.x - start.x).unsigned_abs(); |
| 37 | let height = (end.y - start.y).unsigned_abs(); |
| 38 | |
| 39 | if width > 0 && height > 0 { |
| 40 | Some(Rect::new(x, y, width, height)) |
| 41 | } else { |
| 42 | None |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | /// Draw the selection rectangle outline. |
| 47 | fn draw_selection(&self, ctx: &Context, props: &ToolProperties) { |
| 48 | if let Some(rect) = self.calculate_rect() { |
| 49 | // Draw dashed outline to indicate blur region |
| 50 | ctx.set_dash(&[5.0, 5.0], 0.0); |
| 51 | stroke_rect(ctx, rect, props.color, 2.0); |
| 52 | ctx.set_dash(&[], 0.0); |
| 53 | } |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | impl Default for BlurTool { |
| 58 | fn default() -> Self { |
| 59 | Self::new() |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | impl Tool for BlurTool { |
| 64 | fn handle_event(&mut self, event: &InputEvent, _props: &ToolProperties) -> bool { |
| 65 | match event { |
| 66 | InputEvent::MousePress(e) if e.button == Some(MouseButton::Left) => { |
| 67 | self.start = Some(e.position); |
| 68 | self.end = Some(e.position); |
| 69 | self.drawing = true; |
| 70 | true |
| 71 | } |
| 72 | InputEvent::MouseMove(e) if self.drawing => { |
| 73 | self.end = Some(e.position); |
| 74 | true |
| 75 | } |
| 76 | InputEvent::MouseRelease(e) if e.button == Some(MouseButton::Left) && self.drawing => { |
| 77 | self.end = Some(e.position); |
| 78 | self.drawing = false; |
| 79 | true |
| 80 | } |
| 81 | _ => false, |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | fn draw_preview(&self, ctx: &Context, props: &ToolProperties) { |
| 86 | self.draw_selection(ctx, props); |
| 87 | } |
| 88 | |
| 89 | fn commit(&self, ctx: &Context, props: &ToolProperties) { |
| 90 | // For the preview/commit, we draw a pixelated pattern |
| 91 | // The actual blur is applied by the overlay when committing |
| 92 | if let Some(rect) = self.calculate_rect() { |
| 93 | // Draw a checkerboard pattern to indicate blur |
| 94 | let block_size = props.blur_radius.max(8) as f64; |
| 95 | |
| 96 | ctx.save().ok(); |
| 97 | ctx.rectangle( |
| 98 | rect.x as f64, |
| 99 | rect.y as f64, |
| 100 | rect.width as f64, |
| 101 | rect.height as f64, |
| 102 | ); |
| 103 | ctx.clip(); |
| 104 | |
| 105 | // Draw checkerboard pattern |
| 106 | let mut dark = true; |
| 107 | let mut y = rect.y as f64; |
| 108 | while y < (rect.y + rect.height as i32) as f64 { |
| 109 | let mut x = rect.x as f64; |
| 110 | let row_start_dark = dark; |
| 111 | while x < (rect.x + rect.width as i32) as f64 { |
| 112 | if dark { |
| 113 | ctx.set_source_rgba(0.2, 0.2, 0.2, 0.8); |
| 114 | } else { |
| 115 | ctx.set_source_rgba(0.3, 0.3, 0.3, 0.8); |
| 116 | } |
| 117 | ctx.rectangle(x, y, block_size, block_size); |
| 118 | let _ = ctx.fill(); |
| 119 | dark = !dark; |
| 120 | x += block_size; |
| 121 | } |
| 122 | dark = !row_start_dark; |
| 123 | y += block_size; |
| 124 | } |
| 125 | |
| 126 | ctx.restore().ok(); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | fn reset(&mut self) { |
| 131 | self.start = None; |
| 132 | self.end = None; |
| 133 | self.drawing = false; |
| 134 | } |
| 135 | |
| 136 | fn cursor(&self) -> CursorShape { |
| 137 | CursorShape::Crosshair |
| 138 | } |
| 139 | |
| 140 | fn is_drawing(&self) -> bool { |
| 141 | self.drawing |
| 142 | } |
| 143 | |
| 144 | fn can_commit(&self) -> bool { |
| 145 | self.calculate_rect().is_some() |
| 146 | } |
| 147 | } |
| 148 |