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term: avoid full image decode when parsing iterm2 protocol

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Just decode the size

refs: https://github.com/wez/wezterm/issues/537
This commit is contained in:
Wez Furlong 2021-03-13 13:34:44 -08:00
parent e5974ad86f
commit 6133f88d6a
1 changed files with 11 additions and 7 deletions
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18
term/src/terminalstate.rs
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@ -4,7 +4,6 @@
use super::*;
use crate::color::{ColorPalette, RgbColor};
use anyhow::bail;
use image::{self, GenericImageView};
use log::{debug, error};
use num_traits::FromPrimitive;
use ordered_float::NotNan;
@ -1572,9 +1571,14 @@ impl TerminalState {
return;
}
// Decode the image data
let decoded_image = match image::load_from_memory(&image.data) {
Ok(im) => im,
fn dimensions(data: &[u8]) -> anyhow::Result<(u32, u32)> {
let reader =
image::io::Reader::new(std::io::Cursor::new(data)).with_guessed_format()?;
Ok(reader.into_dimensions()?)
}
let (image_width, image_height) = match dimensions(&image.data) {
Ok(dims) => dims,
Err(e) => {
error!(
"Unable to decode image: {}: size={} {:?}",
@ -1596,13 +1600,13 @@ impl TerminalState {
let height = image.height.to_pixels(cell_pixel_height, physical_rows);
// Compute any Automatic dimensions
let aspect = decoded_image.width() as f32 / decoded_image.height() as f32;
let aspect = image_width as f32 / image_height as f32;
let (width, height) = match (width, height) {
(None, None) => {
// Take the image's native size
let width = decoded_image.width() as usize;
let height = decoded_image.height() as usize;
let width = image_width as usize;
let height = image_height as usize;
// but ensure that it fits
if width as usize > self.pixel_width || height as usize > self.pixel_height {
let width = width as f32;