term: improve readability of error message for oversized image

refs: https://github.com/wez/wezterm/issues/3264

Cargo.lock

@@ -2126,6 +2126,15 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c4a1e36c821dbe04574f602848a19f742f4fb3c98d40449f11bcad18d6b17421"
 
+[[package]]
+name = "humansize"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6cb51c9a029ddc91b07a787f1d86b53ccfa49b0e86688c946ebe8d3555685dd7"
+dependencies = [
+ "libm",
+]
+
 [[package]]
 name = "humantime"
 version = "2.1.0"
@@ -2537,6 +2546,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "libm"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "348108ab3fba42ec82ff6e9564fc4ca0247bdccdc68dd8af9764bbc79c3c8ffb"
+
 [[package]]
 name = "libsqlite3-sys"
 version = "0.24.2"
@@ -6064,6 +6079,7 @@ dependencies = [
  "env_logger",
  "finl_unicode",
  "hex",
+ "humansize",
  "image",
  "k9",
  "lazy_static",

term/Cargo.toml

@@ -17,6 +17,7 @@ use_serde = ["termwiz/use_serde"]
 anyhow = "1.0"
 bitflags = "1.3"
 csscolorparser = "0.6"
+humansize = "2.1"
 miniz_oxide = "0.4"
 finl_unicode = "1.2"
 hex = "0.4"

term/src/terminalstate/image.rs

@@ -1,5 +1,6 @@
 use crate::{Position, StableRowIndex, TerminalState};
 use anyhow::Context;
+use humansize::{SizeFormatter, DECIMAL};
 use ordered_float::NotNan;
 use std::sync::Arc;
 use termwiz::cell::Cell;
@@ -244,11 +245,12 @@ pub(crate) fn check_image_dimensions(width: u32, height: u32) -> anyhow::Result<
     let size = width.saturating_mul(height).saturating_mul(4);
     if size > MAX_IMAGE_SIZE {
         anyhow::bail!(
-            "Ignoring image data {}x{} because {} bytes > max allowed {}",
+            "Ignoring image data for image with dimensions {}x{} \
+             because required RAM {} > max allowed {}",
             width,
             height,
-            size,
-            MAX_IMAGE_SIZE
+            SizeFormatter::new(size, DECIMAL),
+            SizeFormatter::new(MAX_IMAGE_SIZE, DECIMAL),
         );
     }
     Ok(())