tiny-skia 0.6.6

A tiny Skia subset ported to Rust.
Documentation 
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use tiny_skia::*;

#[test]
fn clone_rect_1() {
    let mut pixmap = Pixmap::new(200, 200).unwrap();

    let mut paint = Paint::default();
    paint.set_color_rgba8(50, 127, 150, 200);    paint.anti_alias = true;

    pixmap.fill_path(
        &PathBuilder::from_circle(100.0, 100.0, 80.0).unwrap(),
        &paint,
        FillRule::Winding,
        Transform::identity(),
        None,
    );

    let part = pixmap.as_ref().clone_rect(IntRect::from_xywh(10, 15, 80, 90).unwrap()).unwrap();

    let expected = Pixmap::load_png("tests/images/pixmap/clone-rect-1.png").unwrap();
    assert_eq!(part, expected);
}

#[test]
fn clone_rect_2() {
    let mut pixmap = Pixmap::new(200, 200).unwrap();

    let mut paint = Paint::default();
    paint.set_color_rgba8(50, 127, 150, 200);
    paint.anti_alias = true;

    pixmap.fill_path(
        &PathBuilder::from_circle(100.0, 100.0, 80.0).unwrap(),
        &paint,
        FillRule::Winding,
        Transform::identity(),
        None,
    );

    let part = pixmap.as_ref().clone_rect(IntRect::from_xywh(130, 120, 80, 90).unwrap()).unwrap();

    let expected = Pixmap::load_png("tests/images/pixmap/clone-rect-2.png").unwrap();
    assert_eq!(part, expected);
}

#[test]
fn clone_rect_out_of_bound() {
    let mut pixmap = Pixmap::new(200, 200).unwrap();

    let mut paint = Paint::default();
    paint.set_color_rgba8(50, 127, 150, 200);
    paint.anti_alias = true;

    pixmap.fill_path(
        &PathBuilder::from_circle(100.0, 100.0, 80.0).unwrap(),
        &paint,
        FillRule::Winding,
        Transform::identity(),
        None,
    );

    assert!(pixmap.as_ref().clone_rect(IntRect::from_xywh(250, 15, 80, 90).unwrap()).is_none());
    assert!(pixmap.as_ref().clone_rect(IntRect::from_xywh(10, 250, 80, 90).unwrap()).is_none());
    assert!(pixmap.as_ref().clone_rect(IntRect::from_xywh(10, -250, 80, 90).unwrap()).is_none());
}

#[test]
fn fill() {
    let c = Color::from_rgba8(50, 100, 150, 200);
    let mut pixmap = Pixmap::new(10, 10).unwrap();
    pixmap.fill(c);
    assert_eq!(pixmap.pixel(1, 1).unwrap(), c.premultiply().to_color_u8());
}

#[test]
fn draw_pixmap() {
    // Tests that painting algorithm will switch `Bicubic`/`Bilinear` to `Nearest`.
    // Otherwise we will get a blurry image.

    // A pixmap with the bottom half filled with solid color.
    let sub_pixmap = {
        let mut paint = Paint::default();
        paint.set_color_rgba8(50, 127, 150, 200);

        let rect = Rect::from_xywh(0.0, 50.0, 100.0, 50.0).unwrap();

        let mut pixmap = Pixmap::new(100, 100).unwrap();
        pixmap.fill_rect(rect, &paint, Transform::identity(), None);
        pixmap
    };

    let mut paint = PixmapPaint::default();
    paint.quality = FilterQuality::Bicubic;

    let mut pixmap = Pixmap::new(200, 200).unwrap();
    pixmap.draw_pixmap(20, 20, sub_pixmap.as_ref(), &paint, Transform::identity(), None);

    let expected = Pixmap::load_png("tests/images/canvas/draw-pixmap.png").unwrap();
    assert_eq!(pixmap, expected);
}

#[test]
fn draw_pixmap_ts() {
    let triangle = {
        let mut paint = Paint::default();
        paint.set_color_rgba8(50, 127, 150, 200);
        paint.anti_alias = true;

        let mut pb = PathBuilder::new();
        pb.move_to(0.0, 100.0);
        pb.line_to(100.0, 100.0);
        pb.line_to(50.0, 0.0);
        pb.close();
        let path = pb.finish().unwrap();

        let mut pixmap = Pixmap::new(100, 100).unwrap();
        pixmap.fill_path(&path, &paint, FillRule::Winding, Transform::identity(), None);
        pixmap
    };

    let mut paint = PixmapPaint::default();
    paint.quality = FilterQuality::Bicubic;

    let mut pixmap = Pixmap::new(200, 200).unwrap();
    pixmap.draw_pixmap(
        5, 10,
        triangle.as_ref(),
        &paint,
        Transform::from_row(1.2, 0.5, 0.5, 1.2, 0.0, 0.0),
        None,
    );

    let expected = Pixmap::load_png("tests/images/canvas/draw-pixmap-ts.png").unwrap();
    assert_eq!(pixmap, expected);
}

#[test]
fn draw_pixmap_opacity() {
    let triangle = {
        let mut paint = Paint::default();
        paint.set_color_rgba8(50, 127, 150, 200);
        paint.anti_alias = true;

        let mut pb = PathBuilder::new();
        pb.move_to(0.0, 100.0);
        pb.line_to(100.0, 100.0);
        pb.line_to(50.0, 0.0);
        pb.close();
        let path = pb.finish().unwrap();

        let mut pixmap = Pixmap::new(100, 100).unwrap();
        pixmap.fill_path(&path, &paint, FillRule::Winding, Transform::identity(), None);
        pixmap
    };

    let mut paint = PixmapPaint::default();
    paint.quality = FilterQuality::Bicubic;
    paint.opacity = 0.5;

    let mut pixmap = Pixmap::new(200, 200).unwrap();
    pixmap.draw_pixmap(
        5, 10,
        triangle.as_ref(),
        &paint,
        Transform::from_row(1.2, 0.5, 0.5, 1.2, 0.0, 0.0),
        None,
    );

    let expected = Pixmap::load_png("tests/images/canvas/draw-pixmap-opacity.png").unwrap();
    assert_eq!(pixmap, expected);
}