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gpui: Add interval in pattern (#26459)

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Closes #ISSUE

[git: Use font size to determine pattern slash width
#26446](https://github.com/zed-industries/zed/pull/26446)

This PR only uses font size as the slant line width, and here it further
uses line height as the slant line interval control.

before


![image](https://github.com/user-attachments/assets/a8f2406e-5eed-4528-a9a2-867513613fc7)


now


![image](https://github.com/user-attachments/assets/9b8ccca9-8023-4cb2-a6fe-0e42e19642a4)

big line height


![image](https://github.com/user-attachments/assets/4498e858-4f25-432c-80ee-355726d9c41b)


Release Notes:

- N/A *or* Added/Fixed/Improved ...
This commit is contained in:
0x2CA 2025-03-15 03:51:09 +08:00 • committed by GitHub
parent 685536c27e
commit ba8b9ec2c7
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4 changed files with 55 additions and 53 deletions
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7
crates/gpui/src/platform/mac/shaders.metal
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@ -875,14 +875,17 @@ float4 fill_color(Background background,
break;
}
case 2: {
float pattern_height = background.gradient_angle_or_pattern_height;
float gradient_angle_or_pattern_height = background.gradient_angle_or_pattern_height;
float pattern_width = (gradient_angle_or_pattern_height / 65535.0f) / 255.0f;
float pattern_interval = fmod(gradient_angle_or_pattern_height, 65535.0f) / 255.0f;
float pattern_height = pattern_width + pattern_interval;
float stripe_angle = M_PI_F / 4.0;
float pattern_period = pattern_height * sin(stripe_angle);
float2x2 rotation = rotate2d(stripe_angle);
float2 relative_position = position - float2(bounds.origin.x, bounds.origin.y);
float2 rotated_point = rotation * relative_position;
float pattern = fmod(rotated_point.x, pattern_period);
float distance = min(pattern, pattern_period - pattern) - pattern_period / 4.0;
float distance = min(pattern, pattern_period - pattern) - pattern_period * (pattern_width / pattern_height) / 2.0f;
color = solid_color;
color.a *= saturate(0.5 - distance);
break;