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Merge PR #3903: Give the print preview's grayscale tag a bit of its own

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aiongg
2026-10-22 01:46:35 +00:00
parent 6a74968144 4de9459f2f
commit b17c70e530
1 changed files with 23 additions and 2 deletions
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crates/ui-egui/src/canvas.rs
+23 -2
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@@ -26,8 +26,10 @@ const TEXT_TAG: u64 = 1 << 62;
/// A page rendered for the organize grid at the size it is drawn there.
const GRID_TAG: u64 = 1 << 61;
/// Preview rasters tagged with this bit are converted to luminance on receipt, matching the
/// monochrome print requested by Print ▸ Print in grayscale.
const GRAYSCALE_TAG: u64 = 1 << 60;
/// monochrome print requested by Print ▸ Print in grayscale. It is a bit of its own: the
/// renderer's print bit ([`PRINT_TAG`]) is carried by every print preview, so sharing it would
/// turn colour previews into monochrome ones too.
const GRAYSCALE_TAG: u64 = 1 << 59;
/// The tag of a raster that is out of date (shown until its replacement arrives).
const STALE_TAG: u64 = u64::MAX;
/// Pages whose raster would exceed this many device pixels on a side are drawn in tiles.
@@ -5867,6 +5869,25 @@ trailer << /Root 1 0 R >>
}
}
/// A print preview carries the renderer's print bit; the bit that asks for luminance is
/// its own, so a colour preview is not converted to monochrome and the two modes are told
/// apart by their tags.
#[test]
fn print_preview_tag_distinguishes_grayscale_from_colour() {
let mut v = view(1, PageLayout::Single, true);
v.set_print_grayscale(false);
v.queue_print_previews(&[(0, 1.0)]);
let colour = v.frame_queue.last().expect("a print preview was queued").tag;
assert_ne!(colour & PRINT_TAG, 0, "a print preview carries the renderer's print bit");
assert_eq!(colour & GRAYSCALE_TAG, 0, "a colour print preview must not ask for luminance");
v.set_print_grayscale(true);
v.queue_print_previews(&[(0, 1.0)]);
let gray = v.frame_queue.last().expect("a grayscale print preview was queued").tag;
assert_ne!(gray & GRAYSCALE_TAG, 0, "a grayscale print preview asks for luminance");
assert_ne!(gray, colour, "the two print preview modes must not share a tag");
}
#[test]
fn thumbnails_release_on_scroll_panel_close_and_request_again_after_eviction() {
let ctx = egui::Context::default();