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|
use text::{
Color, RasterOptions, StrokeStyle, TextAlign, TextBackground, TextEngine, TextLayoutParams,
rasterize, text_visual_rect,
};
const FONT_REGULAR: &[u8] = include_bytes!("fixtures/DejaVuSans.ttf");
const FONT_BOLD: &[u8] = include_bytes!("fixtures/DejaVuSans-Bold.ttf");
fn engine() -> TextEngine {
TextEngine::with_font_bytes(&[FONT_REGULAR, FONT_BOLD])
}
fn params(content: &str) -> TextLayoutParams {
TextLayoutParams {
content: content.to_string(),
font_family: "DejaVu Sans".to_string(),
..TextLayoutParams::default()
}
}
fn opaque_pixels(buffer: &text::RgbaBuffer) -> usize {
buffer.pixels.chunks(4).filter(|px| px[3] > 0).count()
}
#[test]
fn raster_produces_non_empty_output_with_visual_rect_dimensions() {
let mut engine = engine();
let measured = engine.measure(¶ms("Hello"), 90.0);
let visual = text_visual_rect(
TextAlign::Center,
&measured.block,
&TextBackground::default(),
1.0,
);
let buffer = rasterize(
&mut engine,
&measured,
&RasterOptions {
text_color: Color::rgb(255, 255, 255),
background: None,
stroke: None,
},
);
assert_eq!(buffer.width, visual.width.ceil() as u32);
assert_eq!(buffer.height, visual.height.ceil() as u32);
assert_eq!(buffer.pixels.len(), buffer.width as usize * buffer.height as usize * 4);
assert!(opaque_pixels(&buffer) > 0);
assert_eq!(buffer.pixel(0, 0).a, 0);
}
#[test]
fn raster_fills_background_inside_padded_box() {
let mut engine = engine();
let measured = engine.measure(¶ms("Hello"), 90.0);
let background = TextBackground {
enabled: true,
color: "#ff0000".to_string(),
..TextBackground::default()
};
let red = Color::rgb(255, 0, 0);
let buffer = rasterize(
&mut engine,
&measured,
&RasterOptions {
text_color: Color::rgb(255, 255, 255),
background: Some((&background, red)),
stroke: None,
},
);
assert_eq!(buffer.height, 102);
let corner = buffer.pixel(2, 2);
assert!(corner.a > 200);
assert!(corner.r > 200);
assert!(corner.g < 60);
assert!(corner.b < 60);
}
#[test]
fn raster_dimensions_grow_with_background_padding() {
let mut engine = engine();
let measured = engine.measure(¶ms("Hello"), 90.0);
let plain = rasterize(
&mut engine,
&measured,
&RasterOptions {
text_color: Color::rgb(255, 255, 255),
background: None,
stroke: None,
},
);
let background = TextBackground {
enabled: true,
color: "#ff0000".to_string(),
..TextBackground::default()
};
let padded = rasterize(
&mut engine,
&measured,
&RasterOptions {
text_color: Color::rgb(255, 255, 255),
background: Some((&background, Color::rgb(255, 0, 0))),
stroke: None,
},
);
assert_eq!(padded.width, plain.width + 60);
assert_eq!(padded.height, plain.height + 84);
}
#[test]
fn raster_underline_adds_pixels_below_text() {
let mut engine = engine();
let plain_params = params("Hello");
let plain = engine.measure(&plain_params, 90.0);
let plain_buffer = rasterize(
&mut engine,
&plain,
&RasterOptions {
text_color: Color::rgb(255, 255, 255),
background: None,
stroke: None,
},
);
let underlined_params = TextLayoutParams {
text_decoration: text::TextDecoration::Underline,
..params("Hello")
};
let underlined = engine.measure(&underlined_params, 90.0);
let underlined_buffer = rasterize(
&mut engine,
&underlined,
&RasterOptions {
text_color: Color::rgb(255, 255, 255),
background: None,
stroke: None,
},
);
assert!(opaque_pixels(&underlined_buffer) > opaque_pixels(&plain_buffer));
}
#[test]
fn raster_stroke_widens_glyph_coverage() {
let mut engine = engine();
let measured = engine.measure(¶ms("Hello"), 180.0);
let fill_only = rasterize(
&mut engine,
&measured,
&RasterOptions {
text_color: Color::rgb(255, 255, 255),
background: None,
stroke: None,
},
);
let stroked = rasterize(
&mut engine,
&measured,
&RasterOptions {
text_color: Color::rgb(255, 255, 255),
background: None,
stroke: Some(StrokeStyle {
color: Color::rgb(0, 0, 0),
width: 4.0,
}),
},
);
assert!(opaque_pixels(&stroked) > opaque_pixels(&fill_only));
}
|
