fonts 0.2.0

High-performance font parsing and analysis library for Grida Canvas
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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258

use fonts::{CurrentTextStyle, UIFontParser};
use std::collections::HashMap;

/// Test smart auto-resolution for CurrentTextStyle
///
/// This test verifies that the parser correctly handles duplicated values between
/// explicit properties and custom_axes, with explicit properties taking priority.
#[test]
fn test_smart_resolution_priority() {
    let parser = UIFontParser::new();

    // Create a style with both explicit properties and custom_axes
    let mut custom_axes = HashMap::new();
    custom_axes.insert("wght".to_string(), 500.0); // Should be overridden by weight: 400
    custom_axes.insert("wdth".to_string(), 120.0); // Should be overridden by width: 100
    custom_axes.insert("slnt".to_string(), 5.0); // Should be overridden by slant: 10.0
    custom_axes.insert("opsz".to_string(), 14.0); // Should be used (no explicit property)

    let current_style = CurrentTextStyle {
        weight: Some(400), // Should take priority over custom_axes["wght"]
        width: Some(100),  // Should take priority over custom_axes["wdth"]
        slant: Some(10.0), // Should take priority over custom_axes["slnt"]
        // Special flag, never maps to custom_axes
        custom_axes,
    };

    // Test weight resolution
    assert_eq!(
        parser.get_current_axis_value(&current_style, "wght"),
        Some(400.0)
    );

    // Test width resolution
    assert_eq!(
        parser.get_current_axis_value(&current_style, "wdth"),
        Some(100.0)
    );

    // Test slant resolution
    assert_eq!(
        parser.get_current_axis_value(&current_style, "slnt"),
        Some(10.0)
    );

    // Test custom axis (no explicit property)
    assert_eq!(
        parser.get_current_axis_value(&current_style, "opsz"),
        Some(14.0)
    );

    // Test italic flag (should never map to custom_axes)
    assert_eq!(parser.get_current_axis_value(&current_style, "ital"), None);
}

/// Test smart auto-resolution fallback to custom_axes when explicit properties are None
#[test]
fn test_smart_resolution_fallback() {
    let parser = UIFontParser::new();

    // Create a style with only custom_axes (no explicit properties)
    let mut custom_axes = HashMap::new();
    custom_axes.insert("wght".to_string(), 500.0);
    custom_axes.insert("wdth".to_string(), 120.0);
    custom_axes.insert("slnt".to_string(), 5.0);
    custom_axes.insert("opsz".to_string(), 14.0);

    let current_style = CurrentTextStyle {
        weight: None, // Should fallback to custom_axes["wght"]
        width: None,  // Should fallback to custom_axes["wdth"]
        slant: None,  // Should fallback to custom_axes["slnt"]
        // Special flag, never maps to custom_axes
        custom_axes,
    };

    // Test fallback to custom_axes
    assert_eq!(
        parser.get_current_axis_value(&current_style, "wght"),
        Some(500.0)
    );
    assert_eq!(
        parser.get_current_axis_value(&current_style, "wdth"),
        Some(120.0)
    );
    assert_eq!(
        parser.get_current_axis_value(&current_style, "slnt"),
        Some(5.0)
    );
    assert_eq!(
        parser.get_current_axis_value(&current_style, "opsz"),
        Some(14.0)
    );

    // Test italic flag (should never map to custom_axes)
    assert_eq!(parser.get_current_axis_value(&current_style, "ital"), None);
}

/// Test smart auto-resolution with mixed explicit and custom values
#[test]
fn test_smart_resolution_mixed() {
    let parser = UIFontParser::new();

    // Create a style with some explicit properties and some custom_axes
    let mut custom_axes = HashMap::new();
    custom_axes.insert("wght".to_string(), 500.0); // Should be overridden by weight: 400
    custom_axes.insert("wdth".to_string(), 120.0); // Should be used (width: None)
    custom_axes.insert("slnt".to_string(), 5.0); // Should be overridden by slant: 10.0
    custom_axes.insert("opsz".to_string(), 14.0); // Should be used (no explicit property)

    let current_style = CurrentTextStyle {
        weight: Some(400), // Should take priority over custom_axes["wght"]
        width: None,       // Should fallback to custom_axes["wdth"]
        slant: Some(10.0), // Should take priority over custom_axes["slnt"]
        // Special flag, never maps to custom_axes
        custom_axes,
    };

    // Test mixed resolution
    assert_eq!(
        parser.get_current_axis_value(&current_style, "wght"),
        Some(400.0)
    ); // Explicit wins
    assert_eq!(
        parser.get_current_axis_value(&current_style, "wdth"),
        Some(120.0)
    ); // Fallback to custom
    assert_eq!(
        parser.get_current_axis_value(&current_style, "slnt"),
        Some(10.0)
    ); // Explicit wins
    assert_eq!(
        parser.get_current_axis_value(&current_style, "opsz"),
        Some(14.0)
    ); // Custom only
}

/// Test smart auto-resolution with empty custom_axes
#[test]
fn test_smart_resolution_empty_custom_axes() {
    let parser = UIFontParser::new();

    // Create a style with only explicit properties
    let current_style = CurrentTextStyle {
        weight: Some(400),
        width: Some(100),
        slant: Some(10.0),

        custom_axes: HashMap::new(), // Empty custom_axes
    };

    // Test explicit properties only
    assert_eq!(
        parser.get_current_axis_value(&current_style, "wght"),
        Some(400.0)
    );
    assert_eq!(
        parser.get_current_axis_value(&current_style, "wdth"),
        Some(100.0)
    );
    assert_eq!(
        parser.get_current_axis_value(&current_style, "slnt"),
        Some(10.0)
    );

    // Test non-existent axes
    assert_eq!(parser.get_current_axis_value(&current_style, "opsz"), None);
    assert_eq!(parser.get_current_axis_value(&current_style, "ital"), None);
}

/// Test smart auto-resolution with None explicit properties and empty custom_axes
#[test]
fn test_smart_resolution_none_values() {
    let parser = UIFontParser::new();

    // Create a style with no values
    let current_style = CurrentTextStyle {
        weight: None,
        width: None,
        slant: None,

        custom_axes: HashMap::new(),
    };

    // Test all should return None
    assert_eq!(parser.get_current_axis_value(&current_style, "wght"), None);
    assert_eq!(parser.get_current_axis_value(&current_style, "wdth"), None);
    assert_eq!(parser.get_current_axis_value(&current_style, "slnt"), None);
    assert_eq!(parser.get_current_axis_value(&current_style, "opsz"), None);
    assert_eq!(parser.get_current_axis_value(&current_style, "ital"), None);
}

/// Test that ital axis now behaves like any other custom axis
#[test]
fn test_italic_flag_special_handling() {
    let parser = UIFontParser::new();

    // Create a style with custom_axes["ital"]
    let mut custom_axes = HashMap::new();
    custom_axes.insert("ital".to_string(), 1.0); // Should be used

    let current_style = CurrentTextStyle {
        weight: None,
        width: None,
        slant: None,
        custom_axes,
    };

    // Test that ital axis now returns the value from custom_axes
    assert_eq!(
        parser.get_current_axis_value(&current_style, "ital"),
        Some(1.0)
    );

    // Test that other axes still work
    assert_eq!(parser.get_current_axis_value(&current_style, "wght"), None);
    assert_eq!(parser.get_current_axis_value(&current_style, "wdth"), None);
    assert_eq!(parser.get_current_axis_value(&current_style, "slnt"), None);
}

/// Test smart auto-resolution with realistic font matching scenario
#[test]
fn test_smart_resolution_realistic_scenario() {
    let parser = UIFontParser::new();

    // Simulate a realistic scenario where user has both explicit properties
    // and custom_axes from a previous font selection
    let mut custom_axes = HashMap::new();
    custom_axes.insert("wght".to_string(), 600.0); // From previous font
    custom_axes.insert("wdth".to_string(), 110.0); // From previous font
    custom_axes.insert("slnt".to_string(), 0.0); // From previous font
    custom_axes.insert("opsz".to_string(), 12.0); // From previous font

    let current_style = CurrentTextStyle {
        weight: Some(400), // User explicitly set weight
        width: None,       // User didn't set width, use previous
        slant: Some(15.0), // User explicitly set slant
        // User explicitly set italic
        custom_axes,
    };

    // Test realistic resolution
    assert_eq!(
        parser.get_current_axis_value(&current_style, "wght"),
        Some(400.0)
    ); // Explicit wins
    assert_eq!(
        parser.get_current_axis_value(&current_style, "wdth"),
        Some(110.0)
    ); // Fallback to previous
    assert_eq!(
        parser.get_current_axis_value(&current_style, "slnt"),
        Some(15.0)
    ); // Explicit wins
    assert_eq!(
        parser.get_current_axis_value(&current_style, "opsz"),
        Some(12.0)
    ); // Previous value
    assert_eq!(parser.get_current_axis_value(&current_style, "ital"), None); // Never maps
}