par-term-render 0.9.1

GPU-accelerated rendering engine for par-term terminal emulator
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160

// Surface resize and DPI scale-factor changes. Both recompute the grid and fan
// the new geometry out to the graphics and shader renderers, so they are kept
// together: `handle_scale_factor_change` finishes by delegating to `resize`.

use winit::dpi::PhysicalSize;

use super::Renderer;

impl Renderer {
    /// Resize the renderer and recalculate grid dimensions based on padding/font metrics
    pub fn resize(&mut self, new_size: PhysicalSize<u32>) -> (usize, usize) {
        if new_size.width > 0 && new_size.height > 0 {
            self.size = new_size;
            self.dirty = true; // Mark dirty on resize
            let result = self.cell_renderer.resize(new_size.width, new_size.height);

            // Update graphics renderer cell dimensions
            self.graphics_renderer.update_cell_dimensions(
                self.cell_renderer.cell_width(),
                self.cell_renderer.cell_height(),
                self.cell_renderer.window_padding(),
            );

            // Update custom shader renderer dimensions
            if let Some(ref mut custom_shader) = self.custom_shader_renderer {
                custom_shader.resize(self.cell_renderer.device(), new_size.width, new_size.height);
                // Sync cell dimensions for cursor position calculation
                custom_shader.update_cell_dimensions(
                    self.cell_renderer.cell_width(),
                    self.cell_renderer.cell_height(),
                    self.cell_renderer.window_padding(),
                );
            }

            // Update cursor shader renderer dimensions
            if let Some(ref mut cursor_shader) = self.cursor_shader_renderer {
                cursor_shader.resize(self.cell_renderer.device(), new_size.width, new_size.height);
                // Sync cell dimensions for cursor position calculation
                cursor_shader.update_cell_dimensions(
                    self.cell_renderer.cell_width(),
                    self.cell_renderer.cell_height(),
                    self.cell_renderer.window_padding(),
                );
            }

            return result;
        }

        self.cell_renderer.grid_size()
    }

    /// Update scale factor and resize so the PTY grid matches the new DPI.
    pub fn handle_scale_factor_change(
        &mut self,
        scale_factor: f64,
        new_size: PhysicalSize<u32>,
    ) -> (usize, usize) {
        let old_scale = self.cell_renderer.scale_factor;
        self.cell_renderer.update_scale_factor(scale_factor);
        let new_scale = self.cell_renderer.scale_factor;

        // Rescale physical pixel values when DPI changes
        if old_scale > 0.0 && (old_scale - new_scale).abs() > f32::EPSILON {
            // Rescale content_offset_y
            let logical_offset_y = self.cell_renderer.content_offset_y() / old_scale;
            let new_physical_offset_y = logical_offset_y * new_scale;
            self.cell_renderer
                .set_content_offset_y(new_physical_offset_y);
            self.graphics_renderer
                .set_content_offset_y(new_physical_offset_y);
            if let Some(ref mut cs) = self.custom_shader_renderer {
                cs.set_content_offset_y(new_physical_offset_y);
            }
            if let Some(ref mut cs) = self.cursor_shader_renderer {
                cs.set_content_offset_y(new_physical_offset_y);
            }

            // Rescale content_offset_x
            let logical_offset_x = self.cell_renderer.content_offset_x() / old_scale;
            let new_physical_offset_x = logical_offset_x * new_scale;
            self.cell_renderer
                .set_content_offset_x(new_physical_offset_x);
            self.graphics_renderer
                .set_content_offset_x(new_physical_offset_x);
            if let Some(ref mut cs) = self.custom_shader_renderer {
                cs.set_content_offset_x(new_physical_offset_x);
            }
            if let Some(ref mut cs) = self.cursor_shader_renderer {
                cs.set_content_offset_x(new_physical_offset_x);
            }

            // Rescale content_inset_bottom
            let logical_inset_bottom = self.cell_renderer.content_inset_bottom() / old_scale;
            let new_physical_inset_bottom = logical_inset_bottom * new_scale;
            self.cell_renderer
                .set_content_inset_bottom(new_physical_inset_bottom);

            // Rescale egui_bottom_inset (status bar)
            if self.cell_renderer.grid.egui_bottom_inset > 0.0 {
                let logical_egui_bottom = self.cell_renderer.grid.egui_bottom_inset / old_scale;
                self.cell_renderer.grid.egui_bottom_inset = logical_egui_bottom * new_scale;
            }

            // Rescale content_inset_right (AI Inspector panel).
            // The shader renderers keep their own copy so they can exclude the
            // panel area from effects; `set_content_inset_right` fans the value
            // out to them and this path has to do the same, or the shaders keep
            // masking the pre-DPI-change panel width.
            if self.cell_renderer.grid.content_inset_right > 0.0 {
                let logical_inset_right = self.cell_renderer.grid.content_inset_right / old_scale;
                let new_physical_inset_right = logical_inset_right * new_scale;
                self.cell_renderer.grid.content_inset_right = new_physical_inset_right;
                if let Some(ref mut cs) = self.custom_shader_renderer {
                    cs.set_content_inset_right(new_physical_inset_right);
                }
                if let Some(ref mut cs) = self.cursor_shader_renderer {
                    cs.set_content_inset_right(new_physical_inset_right);
                }
            }

            // Rescale egui_right_inset
            if self.cell_renderer.grid.egui_right_inset > 0.0 {
                let logical_egui_right = self.cell_renderer.grid.egui_right_inset / old_scale;
                self.cell_renderer.grid.egui_right_inset = logical_egui_right * new_scale;
            }

            // Rescale window_padding
            let logical_padding = self.cell_renderer.window_padding() / old_scale;
            let new_physical_padding = logical_padding * new_scale;
            self.cell_renderer
                .update_window_padding(new_physical_padding);

            // Rescale scrollbar width
            let logical_scrollbar = self.cell_renderer.scrollbar.width() / old_scale;
            let new_physical_scrollbar = logical_scrollbar * new_scale;
            self.cell_renderer.scrollbar.update_appearance(
                new_physical_scrollbar,
                self.cell_renderer.scrollbar.thumb_color(),
                self.cell_renderer.scrollbar.track_color(),
            );

            // Sync new scale factor to shader renderers for cursor sizing
            if let Some(ref mut cs) = self.custom_shader_renderer {
                cs.set_scale_factor(new_scale);
            }
            if let Some(ref mut cs) = self.cursor_shader_renderer {
                cs.set_scale_factor(new_scale);
            }

            // Every inset rescaled above feeds scrollbar geometry, and so does the
            // new scrollbar width. `update_scrollbar` skips the GPU upload when its
            // cached tuple is unchanged, and none of those values are in the tuple,
            // so without this the scrollbar stays at its pre-DPI-change size and
            // position — the same failure the inset setters call out.
            self.last_scrollbar_state = (usize::MAX, 0, 0, 0, 0, 0, 0, 0, 0, 0);
        }

        self.resize(new_size)
    }
}