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image: Add high DPI support

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Always interpret the scaling percentag in physical pixels.
This makes 100% show the image 1:1 in screen pixels.

Closes #37
This commit is contained in:
Sophie Herold 2023-03-27 06:30:02 +02:00 • committed by Christopher Davis
parent 4ce48c5e26
commit e5fc4bc85c
2 changed files with 69 additions and 28 deletions
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28
src/decoder/tiling.rs
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@ -75,15 +75,16 @@ impl Tile {
/// Add tile to snapshot
///
/// This is where parts of images actually land on the screen
pub fn add_to_snapshot(&self, snapshot: &gtk::Snapshot, zoom: f64, options: &RenderOptions) {
let zoom = zoom as f32;
let texture_zoom = self.zoom();
let area = round(&self.area().scale(zoom / texture_zoom, zoom / texture_zoom));
let area_with_bleed = round(
&self
.area_with_bleed()
.scale(zoom / texture_zoom, zoom / texture_zoom),
);
pub fn add_to_snapshot(
&self,
snapshot: &gtk::Snapshot,
output_zoom: f64,
options: &RenderOptions,
) {
// Multiply by scale factor to get the image scaled to `zoom` in physical pixels
let zoom = output_zoom as f32 * options.scale_factor as f32 / self.zoom();
let area = round(&self.area().scale(zoom, zoom));
let area_with_bleed = round(&self.area_with_bleed().scale(zoom, zoom));
// TODO: do not clip outer bounderies of the image
snapshot.push_clip(&area);
@ -171,6 +172,7 @@ impl Default for TiledImage {
#[derive(Debug, Clone)]
pub struct RenderOptions {
pub scaling_filter: gsk::ScalingFilter,
pub scale_factor: i32,
}
impl TiledImage {
@ -193,10 +195,18 @@ impl TiledImage {
.collect();
log::trace!("Rendering {} tiles", tiles.len());
// Scale from application pixels back to physical pixels
snapshot.scale(
1. / options.scale_factor as f32,
1. / options.scale_factor as f32,
);
// reverse to put least fitting tiles in the background
for (_, tile) in tiles.iter().rev() {
tile.add_to_snapshot(snapshot, zoom, options);
}
// reset scale
snapshot.scale(options.scale_factor as f32, options.scale_factor as f32);
}
pub fn push(&mut self, tile: Tile) {