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use glium::{
backend::glutin::Display,
glutin::{
self, dpi,
event::{ElementState, Event, KeyboardInput, VirtualKeyCode, WindowEvent},
event_loop::ControlFlow,
},
texture::{ClientFormat, RawImage2d},
BlitTarget, Rect, Surface,
};
use std::{borrow::Cow, env, fs::File, io, path};
/// Load the image using `png`
fn load_image(path: &path::PathBuf) -> io::Result<RawImage2d<'static, u8>> {
use png::ColorType::*;
let mut decoder = png::Decoder::new(File::open(path)?);
decoder.set_transformations(png::Transformations::normalize_to_color8());
let mut reader = decoder.read_info()?;
let mut img_data = vec![0; reader.output_buffer_size()];
let info = reader.next_frame(&mut img_data)?;
let (data, format) = match info.color_type {
Rgb => (img_data, ClientFormat::U8U8U8),
Rgba => (img_data, ClientFormat::U8U8U8U8),
Grayscale => (
{
let mut vec = Vec::with_capacity(img_data.len() * 3);
for g in img_data {
vec.extend([g, g, g].iter().cloned())
}
vec
},
ClientFormat::U8U8U8,
),
GrayscaleAlpha => (
{
let mut vec = Vec::with_capacity(img_data.len() * 3);
for ga in img_data.chunks(2) {
let g = ga[0];
let a = ga[1];
vec.extend([g, g, g, a].iter().cloned())
}
vec
},
ClientFormat::U8U8U8U8,
),
_ => unreachable!("uncovered color type"),
};
Ok(RawImage2d {
data: Cow::Owned(data),
width: info.width,
height: info.height,
format,
})
}
fn main_loop(files: Vec<path::PathBuf>) -> io::Result<()> {
let mut files = files.into_iter();
let image = load_image(&files.next().unwrap())?;
let event_loop = glutin::event_loop::EventLoop::new();
let window_builder = glutin::window::WindowBuilder::new().with_title("Show Example");
let context_builder = glutin::ContextBuilder::new().with_vsync(true);
let display = glium::Display::new(window_builder, context_builder, &event_loop)
.map_err(|err| io::Error::new(io::ErrorKind::Other, err))?;
resize_window(&display, &image);
let mut texture = glium::Texture2d::new(&display, image).unwrap();
draw(&display, &texture);
event_loop.run(move |event, _, control_flow| match event {
Event::WindowEvent {
event: WindowEvent::CloseRequested,
..
} => exit(control_flow),
Event::WindowEvent {
event:
WindowEvent::KeyboardInput {
input:
KeyboardInput {
state: ElementState::Pressed,
virtual_keycode: code,
..
},
..
},
..
} => match code {
Some(VirtualKeyCode::Escape) => exit(control_flow),
Some(VirtualKeyCode::Right) => match &files.next() {
Some(path) => {
match load_image(path) {
Ok(image) => {
resize_window(&display, &image);
texture = glium::Texture2d::new(&display, image).unwrap();
draw(&display, &texture);
}
Err(err) => {
println!("Error: {}", err);
exit(control_flow);
}
};
}
None => exit(control_flow),
},
_ => {}
},
Event::RedrawRequested(_) => draw(&display, &texture),
_ => {}
});
}
fn draw(display: &glium::Display, texture: &glium::Texture2d) {
let frame = display.draw();
fill_v_flipped(
&texture.as_surface(),
&frame,
glium::uniforms::MagnifySamplerFilter::Linear,
);
frame.finish().unwrap();
}
fn exit(control_flow: &mut ControlFlow) {
*control_flow = ControlFlow::Exit;
}
fn fill_v_flipped<S1, S2>(src: &S1, target: &S2, filter: glium::uniforms::MagnifySamplerFilter)
where
S1: Surface,
S2: Surface,
{
let src_dim = src.get_dimensions();
let src_rect = Rect {
left: 0,
bottom: 0,
width: src_dim.0,
height: src_dim.1,
};
let target_dim = target.get_dimensions();
let target_rect = BlitTarget {
left: 0,
bottom: target_dim.1,
width: target_dim.0 as i32,
height: -(target_dim.1 as i32),
};
src.blit_color(&src_rect, target, &target_rect, filter);
}
fn resize_window(display: &Display, image: &RawImage2d<'static, u8>) {
let mut width = image.width;
let mut height = image.height;
if width < 50 && height < 50 {
width *= 10;
height *= 10;
}
display
.gl_window()
.window()
.set_inner_size(dpi::LogicalSize::new(f64::from(width), f64::from(height)));
}
fn main() {
let args: Vec<String> = env::args().collect();
if args.len() < 2 {
println!("Usage: show files [...]");
} else {
let mut files = vec![];
for file in args.iter().skip(1) {
match if file.contains('*') {
(|| -> io::Result<_> {
for entry in glob::glob(file)
.map_err(|err| io::Error::new(io::ErrorKind::Other, err.msg))?
{
files.push(
entry
.map_err(|_| io::Error::new(io::ErrorKind::Other, "glob error"))?,
)
}
Ok(())
})()
} else {
files.push(path::PathBuf::from(file));
Ok(())
} {
Ok(_) => (),
Err(err) => {
println!("{}: {}", file, err);
break;
}
}
}
// "tests/pngsuite/pngsuite.png"
match main_loop(files) {
Ok(_) => (),
Err(err) => println!("Error: {}", err),
}
}
}
|
