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use pixman::{
Fixed, FormatCode, GradientStop, Image, LinearGradient, Operation, Point, Repeat, Transform,
};
const WIDTH: usize = 400;
const HEIGHT: usize = 200;
pub fn main() {
let stops = [
GradientStop::new(0, [0x0000, 0x0000, 0x0000, 0x0000]),
GradientStop::new(1, [0xffff, 0x0000, 0x1111, 0xffff]),
];
let p1 = Point::from((0f64, 0f64));
let p2 = Point::from((WIDTH as f64, 0f64));
let transform = Transform::new([
[Fixed::ONE, Fixed::ZERO, Fixed::ZERO],
[Fixed::ZERO, Fixed::ONE, Fixed::ZERO],
[Fixed::ZERO, Fixed::ZERO, Fixed::ONE],
]);
let mut alpha = [0x4f00004fu32; WIDTH * HEIGHT]; /* pale blue */
let mut alpha_img = Image::from_slice_mut(
FormatCode::A8R8G8B8,
WIDTH,
HEIGHT,
&mut alpha,
WIDTH * 4,
false,
)
.unwrap();
let mut dest = [0xffffff00u32; WIDTH * HEIGHT]; /* yellow */
let mut dest_img = Image::from_slice_mut(
FormatCode::A8R8G8B8,
WIDTH,
HEIGHT,
&mut dest,
WIDTH * 4,
false,
)
.unwrap();
let mut src = [0xffff0000; WIDTH * HEIGHT];
let src_img = Image::from_slice_mut(
FormatCode::A8R8G8B8,
WIDTH,
HEIGHT,
&mut src,
WIDTH * 4,
false,
)
.unwrap();
let mut grad_img = LinearGradient::new(p1, p2, &stops).unwrap();
grad_img.set_transform(transform).unwrap();
grad_img.set_repeat(Repeat::Pad);
alpha_img.composite(
Operation::Over,
&grad_img,
None,
(0, 0),
(0, 0),
(0, 0),
((10 * WIDTH) as u16, HEIGHT as u16),
);
let src_img = src_img.set_alpha_map(&alpha_img, 10, 10);
dest_img.composite(
Operation::Over,
&src_img,
None,
(0, 0),
(0, 0),
(0, 0),
((10 * WIDTH) as u16, HEIGHT as u16),
);
let mut out_img = Image::new(
FormatCode::A8B8G8R8,
dest_img.width(),
dest_img.height(),
false,
)
.unwrap();
out_img.composite(
Operation::Src,
&dest_img,
None,
(0, 0),
(0, 0),
(0, 0),
(dest_img.width() as u16, dest_img.height() as u16),
);
let image_buffer = image::ImageBuffer::<image::Rgba<u8>, _>::from_raw(
out_img.width() as u32,
out_img.height() as u32,
unsafe {
std::slice::from_raw_parts(
out_img.data() as *const u8,
out_img.stride() * out_img.height(),
)
},
)
.unwrap();
image_buffer
.save_with_format("out.png", image::ImageFormat::Png)
.unwrap();
}
|
