From f298468dc896428062113d1141ababc6bd28b972 Mon Sep 17 00:00:00 2001
From: itsjunetime <junewelker@gmail.com>
Date: Thu, 16 May 2024 18:23:11 -0600
Subject: [PATCH] Initial commit since things seem pretty solid

---
 .gitignore      |    1 +
 .gitmodules     |    6 +
 Cargo.lock      | 1698 +++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml      |   20 +
 ratatui         |    1 +
 ratatui-image   |    1 +
 src/main.rs     |  133 ++++
 src/renderer.rs |  246 +++++++
 src/skip.rs     |   21 +
 src/tui.rs      |  403 +++++++++++
 10 files changed, 2530 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 .gitmodules
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 160000 ratatui
 create mode 160000 ratatui-image
 create mode 100644 src/main.rs
 create mode 100644 src/renderer.rs
 create mode 100644 src/skip.rs
 create mode 100644 src/tui.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..d8512a1
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "ratatui"]
+	path = ratatui
+	url = https://github.com/ratatui-org/ratatui
+[submodule "ratatui-image"]
+	path = ratatui-image
+	url = https://github.com/benjajaja/ratatui-image
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..0dcac79
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+itertools = "0.12.1"
+oxipng = { version = "9.1.1", default-features = false, features = ["parallel"] }
diff --git a/ratatui b/ratatui
new file mode 160000
index 0000000..9bd89c2
--- /dev/null
+++ b/ratatui
@@ -0,0 +1 @@
+Subproject commit 9bd89c218afb1f3999dce1bfe6edea5b7442966d
diff --git a/ratatui-image b/ratatui-image
new file mode 160000
index 0000000..e7be613
--- /dev/null
+++ b/ratatui-image
@@ -0,0 +1 @@
+Subproject commit e7be6130b498d8dc408da7cff30ca37acb6ee262
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..b907f3e
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,133 @@
+use std::{path::PathBuf, str::FromStr};
+
+use crossterm::{execute, terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen}};
+use glib::{LogField, LogLevel, LogWriterOutput};
+use notify::{RecursiveMode, Watcher};
+use ratatui::{backend::CrosstermBackend, Terminal};
+use ratatui_image::picker::Picker;
+use tui::{InputAction, Tui};
+use futures_util::stream::StreamExt;
+use renderer::{RenderInfo, RenderNotif};
+
+mod tui;
+mod renderer;
+mod skip;
+
+#[tokio::main(flavor = "current_thread")]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+	let mut args = std::env::args().skip(1);
+	let file = args.next().expect("Program requires a file to process");
+	let path = PathBuf::from_str(&file)?.canonicalize()?;
+
+	let (watch_tx, render_rx) = tokio::sync::mpsc::channel(1);
+	let tui_tx = watch_tx.clone();
+
+	// we need to call this outside the recommended_watcher call because if we call it inside, that
+	// will be calling it from a thread not owned by the tokio runtime (since it's created by
+	// calling thread::spawn) and that will cause a panic
+	let mut watcher = notify::recommended_watcher(move |_| {
+		// This shouldn't fail to send unless the receiver gets disconnected. If that's happened,
+		// then like the main thread has panicked or something, so it doesn't matter if this panics
+		// as well
+		watch_tx.blocking_send(renderer::RenderNotif::Reload).unwrap();
+	})?;
+
+	// We're making this nonrecursive 'cause we're just watching a single file, so there's nothing
+	// to recurse into
+	watcher.watch(&path, RecursiveMode::NonRecursive)?;
+
+	let file_path = format!("file://{}", path.clone().into_os_string().to_string_lossy());
+	let (render_tx, mut tui_rx) = tokio::sync::mpsc::channel(1);
+
+	// We need to create `picker` on this thread because if we create it on the `renderer` thread,
+	// it messes up something with user input. Input never makes it to the crossterm thing
+	let mut picker = Picker::from_termios()?;
+	picker.guess_protocol();
+
+	// then we want to spawn off the rendering task
+	// We need to use the thread::spawn API so that this exists in a thread not owned by tokio,
+	// since the methods we call in `start_rendering` will panic if called in an async context
+	std::thread::spawn(move || { renderer::start_rendering(file_path, render_tx, render_rx) });
+
+	let mut ev_stream = crossterm::event::EventStream::new();
+
+	let file_name = path.file_name()
+		.map(|n| n.to_string_lossy())
+		.unwrap_or_else(|| "Unknown file".into())
+		.to_string();
+	let mut tui = tui::Tui::new(file_name, picker);
+
+	let backend = CrosstermBackend::new(std::io::stdout());
+	let mut term = Terminal::new(backend)?;
+
+	// poppler has some annoying logging (e.g. if you request a page index out-of-bounds of a
+	// document's pages, then it will return `None`, but still log to stderr with CRITICAL level),
+	// so we want to just ignore all logging since this is a tui app.
+	glib::log_set_writer_func(noop);
+
+	execute!(
+		term.backend_mut(),
+		EnterAlternateScreen,
+		crossterm::cursor::Hide
+	)?;
+	enable_raw_mode()?;
+
+	let mut main_area = tui::Tui::main_layout(&term.get_frame());
+	tui_tx.send(RenderNotif::Area(main_area[1])).await?;
+
+	loop {
+		let mut needs_redraw;
+
+		tokio::select! {
+			// First we check if we have any keystrokes
+			Some(ev) = ev_stream.next() => {
+				// If we can't get user input, just crash.
+				let ev = ev.expect("Couldn't get any user input");
+
+				needs_redraw = match tui.handle_event(ev) {
+					None => false,
+					Some(InputAction::Redraw) => true,
+					Some(InputAction::QuitApp) => break,
+					Some(InputAction::JumpingToPage(usize)) => {
+						tui_tx.send(RenderNotif::JumpToPage(usize)).await?;
+						true
+					}
+				};
+			},
+			Some(renderer_msg) = tui_rx.recv() => {
+				match renderer_msg {
+					Ok(RenderInfo::NumPages(num)) => tui.set_n_pages(num),
+					Ok(RenderInfo::Page(img, page_num)) => tui.page_ready(img, page_num),
+					Err(e) => tui.show_error(e)
+				}
+				needs_redraw = true;
+			}
+		}
+
+		let new_area = Tui::main_layout(&term.get_frame());
+		if new_area != main_area {
+			main_area = new_area;
+			tui_tx.send(RenderNotif::Area(main_area[1])).await?;
+			needs_redraw = true;
+		}
+
+		if needs_redraw {
+			term.draw(|f| {
+				tui.render(f, &main_area);
+			})?;
+		}
+	}
+
+	execute!(
+		term.backend_mut(),
+		LeaveAlternateScreen,
+		crossterm::cursor::Show
+	)?;
+	disable_raw_mode()?;
+
+	Ok(())
+}
+
+fn noop(_: LogLevel, _: &[LogField<'_>]) -> LogWriterOutput {
+	LogWriterOutput::Handled
+}
diff --git a/src/renderer.rs b/src/renderer.rs
new file mode 100644
index 0000000..0db71e8
--- /dev/null
+++ b/src/renderer.rs
@@ -0,0 +1,246 @@
+use cairo::{Antialias, Format};
+use image::{DynamicImage, ImageFormat};
+use itertools::Itertools;
+use oxipng::Options;
+use poppler::{Document, Page};
+use ratatui::layout::Rect;
+use tokio::sync::mpsc::{error::TryRecvError, Receiver, Sender};
+
+pub enum RenderNotif {
+	Area(Rect),
+	JumpToPage(usize),
+	Reload
+}
+
+#[derive(Debug)]
+pub enum RenderError {
+	Doc(glib::Error),
+	// Don't like storing an error as a string but it needs to be Send to send to the main thread,
+	// and it's just going to be shown to the user, so whatever
+	Render(String)
+}
+
+pub enum RenderInfo {
+	NumPages(usize),
+	Page(DynamicImage, usize)
+}
+
+// this function has to be sync (non-async) because the poppler::Document needs to be held during
+// most of it, but that's basically just a wrapper around `*c_void` cause it's just a binding to C
+// code, so it's !Send and thus can't be held across await points. So we can't call any of the
+// async `send` or `recv` methods in this function body, since those create await points. Which
+// means we need to call blocking_(send|recv). Those functions panic if called in an async context.
+// So here we are.
+// Also we just kinda 'unwrap' all of the send/recv calls here 'cause if they return an error, that
+// means the other side's disconnected, which means that the main thread has panicked, which means
+// we're done.
+pub fn start_rendering(
+	path: String,
+	sender: Sender<Result<RenderInfo, RenderError>>,
+	mut receiver: Receiver<RenderNotif>
+) {
+	// first, wait 'til we get told what the current starting area is so that we can set it to
+	// know what to render to
+	let mut area;
+	loop {
+		if let RenderNotif::Area(r) = receiver.blocking_recv().unwrap() {
+			area = r;
+			break;
+		}
+	};
+
+	'reload: loop {
+		let doc = match Document::from_file(&path, None) {
+			Err(e) => {
+				sender.blocking_send(Err(RenderError::Doc(e))).unwrap();
+				return;
+			},
+			Ok(d) => d
+		};
+
+		let n_pages = doc.n_pages() as usize;
+		sender.blocking_send(Ok(RenderInfo::NumPages(n_pages))).unwrap();
+
+		// We're using this vec of bools to indicate which page numbers have already been rendered,
+		// to support people jumping to specific pages and having quick rendering results. We
+		// `split_at_mut` at 0 initially (which bascially makes `right == rendered && left == []`),
+		// doing basically nothing, but if we get a notification that something has been jumped to,
+		// then we can split at that page and render at both sides of it
+		let mut rendered = vec![false; n_pages];
+		let mut start_point = 0;
+
+		// This is kinda a weird way of doing this, but if we get a notification that the area
+		// changed, we want to start re-rending all of the pages, but we don't want to reload the
+		// document. If there was a mechanism to say 'start this for-loop over' then I would do
+		// that, but I don't think such a thing exists, so this is our attempt
+		'render_pages: loop {
+			// what we do with a notif is the same regardless of if we're in the middle of
+			// rendering the list of pages or we're all done
+			macro_rules! handle_notif {
+				($notif:ident) => {
+					match $notif {
+						RenderNotif::Reload => continue 'reload,
+						RenderNotif::Area(new_area) => {
+							let bigger = new_area.width > area.width || new_area.height > area.height;
+							area = new_area;
+							// we only want to re-render pages if the new area is greater than the old
+							// one, 'cause then we might need sharper images to make it all look good.
+							// If the new area is smaller, then the same high-quality-rendered images
+							// will still look fine, so it's ok to leave it.
+							if bigger {
+								rendered = vec![false; n_pages];
+								continue 'render_pages;
+							}
+						},
+						RenderNotif::JumpToPage(page) => {
+							start_point = page;
+							continue 'render_pages;
+						}
+					}
+				}
+			}
+
+			let (left, right) = rendered.split_at_mut(start_point);
+
+			let page_iter = right.iter_mut()
+				.enumerate()
+				.map(|(idx, p)| (idx + start_point, p))
+				.interleave(
+					left.iter_mut()
+						.enumerate()
+						.map(|(idx, p)| (idx - (start_point + 1), p))
+				);
+
+			for (num, rendered) in page_iter {
+				if *rendered {
+					continue;
+				}
+
+				// check if we've been told to change the area that we're rendering to,
+				// or if we're told to rerender
+				match receiver.try_recv() {
+					Err(TryRecvError::Disconnected) => panic!("disconnected :("),
+					Ok(notif) => handle_notif!(notif),
+					Err(TryRecvError::Empty) => ()
+				};
+
+				// We know this is in range 'cause we're iterating over it
+				let page = doc.page(num as i32).unwrap();
+
+				// render the page
+				let to_send = render_single_page(page, area)
+					.and_then(|img_data| match image::load_from_memory_with_format(&img_data, ImageFormat::Png) {
+						Ok(img) => {
+							// TODO find some way to do oxipng stuff maybe. Perchance throw them
+							// all onto a new thread or whatever. idk.
+							/*let sender_clone = sender.clone();
+							std::thread::spawn(move || {
+								let optimized = oxipng::optimize_from_memory(
+									&img_data,
+									&Options::default()
+								).unwrap();
+								let img = image::load_from_memory_with_format(&optimized, ImageFormat::Png).unwrap();
+								sender_clone.blocking_send(Ok(RenderInfo::Page(img, num))).unwrap();
+							});*/
+							println!("data is {} while img is {}", img_data.len(), img.as_rgb8().unwrap().as_raw().len());
+							Ok(img)
+						},
+						Err(e) => Err(format!("Couldn't create DynamicImage: {e}"))
+					}).map(|img| RenderInfo::Page(img, num))
+					.map_err(RenderError::Render);
+
+				// then send it over
+				sender.blocking_send(to_send).unwrap();
+
+				*rendered = true;
+			};
+			// Then once we've rendered all these pages, wait until we get another notification
+			// that this doc needs to be reloaded
+			loop {
+				// This once returned None despite the main thing being still connected (I think, at
+				// last), so I'm just being safe here
+				let Some(msg) = receiver.blocking_recv() else {
+					return
+				};
+				handle_notif!(msg);
+			}
+		}
+	}
+}
+
+fn render_single_page(
+	page: Page,
+	area: Rect,
+//) -> Result<DynamicImage, String> {
+) -> Result<Vec<u8>, String> {
+	// First, get the font size; the number of pixels (width x height) per font character (I
+	// think; it's at least something like that) on this terminal screen.
+	let size = crossterm::terminal::window_size()
+		.map_err(|e| format!("Couldn't get window size: {e}"))?;
+	let col_h = size.height / size.rows;
+	let col_w = size.width / size.columns;
+
+	// then, get the size of the page
+	let (p_width, p_height) = page.size();
+
+	// and get its aspect ratio
+	let p_aspect_ratio = p_width / p_height;
+
+	// Then we get the full pixel dimensions of the area provided to us, and the aspect ratio
+	// of that area
+	let area_full_h = (area.height * col_h) as f64;
+	let area_full_w = (area.width * col_w) as f64;
+	let area_aspect_ratio = area_full_w / area_full_h;
+
+	// and get the ratio that this page would have to be scaled by to fit perfectly within the
+	// area provided to us.
+	// we do this first by comparing the aspec ratio of the page with the aspect ratio of the
+	// area to fit it within. If the aspect ratio of the page is larger, then we need to scale
+	// the width of the page to fill perfectly within the height of the area. Otherwise, we
+	// scale the height to fit perfectly. The dimension that _is not_ scaled to fit perfectly
+	// is scaled by the same factor as the dimension that _is_ scaled perfectly.
+	let scale_factor = if p_aspect_ratio > area_aspect_ratio {
+		area_full_w as f64 / p_width
+	} else {
+		area_full_h as f64 / p_height
+	};
+
+	let surface_width = p_width * scale_factor;
+	let surface_height = p_height * scale_factor;
+
+	let surface = cairo::ImageSurface::create(
+		Format::ARgb32,
+		// No matter how big you make these arguments, the image will be drawn at the same
+		// size. So if you make them really big, the image will be drawn on a quarter of it. If
+		// you make them really small, the image will cover more than all of the surface.
+		//
+		// However, that only stands as long as you don't scale the context that you place this
+		// surface into. If you scale the dimensions of this image by n, then scale the context
+		// by that same amount, then it'll still fit perfectly into the context, but be
+		// rendered at higher quality.
+		surface_width as i32,
+		surface_height as i32
+	).map_err(|e| format!("Couldn't create ImageSurface: {e}"))?;
+	let ctx = cairo::Context::new(surface)
+		.map_err(|e| format!("Couldn't create Context: {e}"))?;
+
+	ctx.scale(scale_factor, scale_factor);
+
+	// The default background color of PDFs (at least, I think) is white, so we need to set
+	// that as the background color, then paint, then render.
+	ctx.set_source_rgba(1.0, 1.0, 1.0, 1.0);
+	ctx.set_antialias(Antialias::Best);
+	ctx.paint().map_err(|e| format!("Couldn't paint Context: {e}"))?;
+	page.render_for_printing(&ctx);
+	ctx.scale(1. / scale_factor, 1. / scale_factor);
+
+	let mut img_data = Vec::new();
+	ctx.target().write_to_png(&mut img_data)
+		.map_err(|e| format!("Couldn't write surface to png: {e}"))?;
+
+	/*let img = image::load_from_memory_with_format(&img_data, ImageFormat::Png)
+		.map_err(|e| format!("Couldn't load image from provided data: {e}"))?;
+
+	Ok(img)*/
+	Ok(img_data)
+}
diff --git a/src/skip.rs b/src/skip.rs
new file mode 100644
index 0000000..8f99784
--- /dev/null
+++ b/src/skip.rs
@@ -0,0 +1,21 @@
+use ratatui::widgets::Widget;
+
+pub struct Skip {
+	skip: bool
+}
+
+impl Skip {
+	pub fn new(skip: bool) -> Self {
+		Self { skip }
+	}
+}
+
+impl Widget for Skip {
+	fn render(self, area: ratatui::prelude::Rect, buf: &mut ratatui::prelude::Buffer) {
+		for x in area.x..(area.x + area.width) {
+			for y in area.y..(area.y + area.height) {
+				buf.get_mut(x, y).skip = self.skip;
+			}
+		}
+	}
+}
diff --git a/src/tui.rs b/src/tui.rs
new file mode 100644
index 0000000..35500f3
--- /dev/null
+++ b/src/tui.rs
@@ -0,0 +1,403 @@
+use std::rc::Rc;
+
+use crossterm::event::{Event, KeyCode, MouseEventKind};
+use image::DynamicImage;
+use ratatui::{layout::{Constraint, Flex, Layout, Rect}, style::{Color, Style}, text::Span, widgets::{Block, Borders, Padding}, Frame};
+use ratatui_image::{picker::Picker, protocol::Protocol, Image, Resize};
+
+use crate::{renderer::RenderError, skip::Skip};
+
+pub struct Tui {
+	name: String,
+	page: usize,
+	error: Option<String>,
+	input_state: Option<InputCommand>,
+	// Used as a way to track if we need to draw the images, to save ratatui from doing a lot of
+	// diffing work
+	last_render: LastRender,
+	// So we hold the `Picker` here and store the `RenderedImage` as a option between the
+	// `DynamicImage` and `Box<dyn Protocol>` because the Protocol thing is much less
+	// space-effecient (since it needs to store like a large string instead of just bytes of data)
+	// so we want to store them as `DynamicImage`s until they're shown, at which point we render
+	// them to the `Box<dyn Protocol>` and keep them like that
+	picker: Picker,
+	rendered: Vec<Option<RenderedImage>>,
+}
+
+#[derive(Default, Debug)]
+struct LastRender {
+	rect: Rect,
+	pages_shown: usize,
+	unused_width: u16
+}
+
+enum RenderedImage {
+	Image(DynamicImage),
+	Text(Box<dyn Protocol>)
+}
+
+enum InputCommand {
+	GoToPage(usize)
+}
+
+impl Tui {
+	pub fn new(name: String, picker: Picker) -> Tui {
+		Self {
+			name,
+			page: 0,
+			error: None,
+			input_state: None,
+			picker,
+			last_render: LastRender::default(),
+			rendered: vec![]
+		}
+	}
+
+	pub fn main_layout(frame: &Frame<'_>) -> Rc<[Rect]> {
+		Layout::default()
+			.constraints([
+				Constraint::Length(3),
+				Constraint::Fill(1),
+				Constraint::Length(3)
+			])
+			.horizontal_margin(4)
+			.vertical_margin(2)
+			.split(frame.size())
+	}
+
+	pub fn render(&mut self, frame: &mut Frame<'_>, main_area: &[Rect]) {
+		let top_block = Block::new()
+			.padding(Padding {
+				right: 2,
+				left: 2,
+				..Padding::default()
+			})
+			.borders(Borders::BOTTOM);
+
+		let top_area = top_block.inner(main_area[0]);
+
+		let page_nums_text = format!("{} / {}", self.page + 1, self.rendered.len());
+
+		let top_layout = Layout::horizontal([
+			Constraint::Fill(1),
+			Constraint::Length(page_nums_text.len() as u16)
+		]).split(top_area);
+
+		let title = Span::styled(
+			&self.name,
+			Style::new()
+				.fg(Color::Cyan)
+		);
+
+		let page_nums = Span::styled(
+			&page_nums_text,
+			Style::new()
+				.fg(Color::Cyan)
+		);
+
+		frame.render_widget(top_block, main_area[0]);
+		frame.render_widget(title, top_layout[0]);
+		frame.render_widget(page_nums, top_layout[1]);
+
+		let bottom_block = Block::new()
+			.padding(Padding {
+				top: 1,
+				right: 2,
+				left: 2,
+				bottom: 0
+			})
+			.borders(Borders::TOP);
+		let bottom_area = bottom_block.inner(main_area[2]);
+
+		frame.render_widget(bottom_block, main_area[2]);
+
+		let rendered_str = format!(
+			"Rendered: {}%",
+			(self.rendered.iter().filter(|i| i.is_some()).count() * 100) / self.rendered.len()
+		);
+
+		let bottom_layout = Layout::horizontal([
+			Constraint::Fill(1),
+			Constraint::Length(rendered_str.len() as u16)
+		]).split(bottom_area);
+
+		let rendered_span = Span::styled(
+			&rendered_str,
+			Style::new()
+				.fg(Color::Cyan)
+		);
+		frame.render_widget(rendered_span, bottom_layout[1]);
+
+		if let Some(ref error_str) = self.error {
+			let span = Span::styled(
+				format!("Couldn't render a page: {error_str}"),
+				Style::new()
+					.fg(Color::Red)
+			);
+			frame.render_widget(span, bottom_layout[0]);
+		} else if let Some(ref cmd) = self.input_state {
+			match cmd {
+				InputCommand::GoToPage(page) => {
+					let span = Span::styled(
+						format!("Go to: {page}"),
+						Style::new()
+							.fg(Color::Blue)
+					);
+					frame.render_widget(span, bottom_layout[0]);
+				}
+			}
+		}
+
+		let mut img_area = main_area[1];
+
+		let size = frame.size();
+		if size == self.last_render.rect {
+			// If we haven't resized (and haven't used the Rect as a way to mark that we need to
+			// resize this time), then go through every element in the buffer where any Image would
+			// be written and set to skip it so that ratatui doesn't spend a lot of time diffing it
+			// each re-render
+			self.last_render.rect = size;
+			frame.render_widget(Skip::new(true), img_area);
+		} else {
+			// here we calculate how many pages can fit in the available area.
+			let mut test_area_w = img_area.width;
+			// go through our pages, starting at the first one we want to view
+			let page_widths = self.rendered[self.page..].iter()
+				// and get their indices (I know it's offset, we fix it down below when we actually
+				// render each page)
+				.enumerate()
+				// and only take as many as are ready to be rendered
+				.take_while(|(_, page)| page.is_some())
+				// and map it to their width (in cells on the terminal, not pixels)
+				.flat_map(|(idx, page)|
+					page.as_ref().map(|img| (
+						idx,
+						match img {
+							RenderedImage::Image(img) => (img.width() / self.picker.font_size.0 as u32) as u16,
+							RenderedImage::Text(img) => img.rect().width,
+						}
+					))
+				)
+				// and then take them as long as they won't overflow the available area.
+				.take_while(|(_, width)| {
+					match test_area_w.checked_sub(*width) {
+						Some(new_val) => {
+							test_area_w = new_val;
+							true
+						},
+						None => false
+					}
+				})
+				.collect::<Vec<_>>();
+
+			if page_widths.is_empty() {
+				// If none are ready to render, just show the loading thing
+				Self::render_loading_in(frame, img_area)
+			} else {
+				let total_width = page_widths
+					.iter()
+					.map(|(_, w)| w)
+					.sum::<u16>();
+
+				self.last_render.pages_shown = page_widths.len();
+
+				let unused_width = img_area.width - total_width;
+				self.last_render.unused_width = unused_width;
+				img_area.x += unused_width / 2;
+
+				for (page_idx, width) in page_widths {
+					// now, theoretically, when we call this, this page should *not* be None, but we do
+					// have to account for that possibility since we can't `borrow` the image from self
+					// when passing it in to `render_single_page` since that would be a mutable
+					// reference + an immutable reference (and also we need to potentially temporarily
+					// remove it from the array of rendered pages to replace it with a text-rendered
+					// image)
+					self.render_single_page(frame, page_idx + self.page, Rect { width, ..img_area });
+					img_area.x += width;
+				}
+				// frame.bypass_diff = true;
+
+				// we want to set this at the very end so it doesn't get set somewhere halfway through and
+				// then the whole diffing thing messes it up
+				self.last_render.rect = frame.size();
+			}
+		}
+	}
+
+	fn render_single_page(&mut self, frame: &mut Frame<'_>, page_idx: usize, img_area: Rect) {
+		match self.rendered[page_idx] {
+			Some(ref page_img) => {
+				let dyn_img = match page_img {
+					RenderedImage::Image(_) => {
+						// Couldn't think of a better way to do this. We need to `take` the
+						// image out so we can transform it into a RenderedImage::Text, but we
+						// don't want to `take` it out when it's already a `Text` or `None`...
+						// idk, maybe i'll think of something better later.
+						let Some(RenderedImage::Image(img)) = self.rendered[page_idx].take() else {
+							unreachable!();
+						};
+
+						// We don't actually want to Crop this image, but we've already
+						// verified (with the ImageSurface stuff) that the image is the correct
+						// size for the area given, so to save ratatui the work of having to
+						// resize it, we tell them to crop it to fit.
+						let dyn_img = match self.picker.new_protocol(img, img_area, Resize::Crop) {
+							Ok(img) => img,
+							Err(e) => {
+								self.error = Some(format!("Couldn't convert DynamicImage to ratatui image: {e}"));
+								return;
+							}
+						};
+
+						self.rendered[page_idx] = Some(RenderedImage::Text(dyn_img));
+						let Some(RenderedImage::Text(ref txt)) = self.rendered[page_idx] else {
+							unreachable!();
+						};
+
+						txt
+					}
+					RenderedImage::Text(ref img) => img,
+				};
+
+				frame.render_widget(Image::new(&**dyn_img), img_area);
+			},
+			None => Self::render_loading_in(frame, img_area)
+		};
+	}
+
+	fn render_loading_in(frame: &mut Frame<'_>, area: Rect) {
+		let loading_str = "Loading...";
+		let inner_space = Layout::horizontal([
+			Constraint::Length(loading_str.len() as u16),
+		]).flex(Flex::Center)
+		.split(area);
+
+		let loading_span = Span::styled(loading_str, Style::new().fg(Color::Cyan));
+
+		frame.render_widget(loading_span, inner_space[0]);
+	}
+
+	fn change_page(&mut self, change: PageChange, amt: ChangeAmount) -> Option<InputAction> {
+		let diff = match amt {
+			ChangeAmount::Single => 1,
+			ChangeAmount::WholeScreen => self.last_render.pages_shown
+		};
+
+		let old = self.page;
+		match change {
+			PageChange::Next => self.set_page((self.page + diff).min(self.rendered.len() - 1)),
+			PageChange::Prev => self.set_page(self.page.saturating_sub(diff)),
+		}
+
+		(old != self.page).then_some(InputAction::Redraw)
+	}
+
+	pub fn set_n_pages(&mut self, n_pages: usize) {
+		self.rendered = Vec::with_capacity(n_pages);
+		for _ in 0..n_pages {
+			self.rendered.push(None);
+		}
+		// mark that we need to re-render the images
+	}
+
+	pub fn page_ready(&mut self, img: DynamicImage, page_num: usize) {
+		// If this new image woulda fit within the available space on the last render AND it's
+		// within the range where it might've been rendered with the last shown pages, then reset
+		// the last rect marker so that all images are forced to redraw on next render and this one
+		// is drawn with them
+		let img_w = (img.width() / self.picker.font_size.0 as u32) as u16;
+		if img_w <= self.last_render.unused_width {
+			let num_fit = self.last_render.unused_width / img_w;
+			if page_num >= self.page && (self.page + num_fit as usize) >= page_num {
+				self.last_render.rect = Rect::default();
+			}
+		}
+
+		// We always just set this here because we handle reloading in the `set_n_pages` function.
+		// If the document was reloaded, then It'll have the `set_n_pages` called to set the new
+		// number of pages, so the vec will already be cleared
+		self.rendered[page_num] = Some(RenderedImage::Image(img));
+
+		if page_num > 10 { panic!() }
+	}
+
+	pub fn handle_event(&mut self, ev: Event) -> Option<InputAction> {
+		match ev {
+			Event::Key(key) => {
+				match key.code {
+					KeyCode::Right | KeyCode::Char('l') => self.change_page(PageChange::Next, ChangeAmount::Single),
+					KeyCode::Down | KeyCode::Char('j') => self.change_page(PageChange::Next, ChangeAmount::WholeScreen),
+					KeyCode::Left | KeyCode::Char('h') => self.change_page(PageChange::Prev, ChangeAmount::Single),
+					KeyCode::Up | KeyCode::Char('k') => self.change_page(PageChange::Prev, ChangeAmount::WholeScreen),
+					KeyCode::Esc | KeyCode::Char('q') => Some(InputAction::QuitApp),
+					KeyCode::Char('g') => {
+						self.input_state = Some(InputCommand::GoToPage(0));
+						Some(InputAction::Redraw)
+					},
+					KeyCode::Char(c) => {
+						let Some(InputCommand::GoToPage(ref mut page)) = self.input_state else {
+							return None;
+						};
+
+						c.to_digit(10)
+							.map(|input_num| {
+								*page = (*page * 10) + input_num as usize;
+								InputAction::Redraw
+							})
+					},
+					KeyCode::Enter => self.input_state.take()
+						.and_then(|cmd| match cmd {
+							// Only forward the command if it's within range
+							InputCommand::GoToPage(page) => (page < self.rendered.len()).then(|| {
+								self.set_page(page);
+								InputAction::JumpingToPage(page)
+							})
+						}),
+					_ => None,
+				}
+			},
+			Event::Mouse(mouse) => match mouse.kind {
+				MouseEventKind::ScrollRight => self.change_page(PageChange::Next, ChangeAmount::Single),
+				MouseEventKind::ScrollDown => self.change_page(PageChange::Next, ChangeAmount::WholeScreen),
+				MouseEventKind::ScrollLeft => self.change_page(PageChange::Prev, ChangeAmount::Single),
+				MouseEventKind::ScrollUp => self.change_page(PageChange::Prev, ChangeAmount::WholeScreen),
+				_ => None,
+			}
+			// One of these options is Event::Resize, and we don't care about that because
+			// we always check, regardless, if the available area for the images has
+			// changed.
+			_ => None,
+		}
+	}
+
+	pub fn show_error(&mut self, err: RenderError) {
+		self.error = Some(match err {
+			RenderError::Doc(e) => format!("Couldn't open document: {e}"),
+			RenderError::Render(e) => format!("Couldn't render page: {e}")
+		});
+	}
+
+	fn set_page(&mut self, page: usize) {
+		if page != self.page {
+			// mark that we need to re-render the images
+			self.last_render.rect = Rect::default();
+			self.page = page;
+		}
+	}
+}
+
+pub enum InputAction {
+	Redraw,
+	JumpingToPage(usize),
+	QuitApp
+}
+
+enum PageChange {
+	Prev,
+	Next
+}
+
+enum ChangeAmount {
+	WholeScreen,
+	Single
+}