1e0b3cab7a
Phase 7.3 strangler reorg — rename the native widget host and the desktop runner crates to the op- prefix. The desktop+native merge was declined: keeping the library / binary split preserves the mobile- checkable op-host-native lib (cargo check -p op-host-native on iOS / Android, relied on by check-jian-boundaries.sh + the CI mobile job), which a folded-in winit binary would break. A clean separate rename is purely mechanical and the brief permits it. - openpencil-shell-native -> op-host-native (lib op_host_native) - openpencil-desktop -> op-host-desktop crate; the shipped executable keeps the stable openpencil-desktop [[bin]] name so release artifacts + external CLI integrations are unaffected - every openpencil_shell_core:: path -> op_editor_ui:: - every openpencil_shell_native:: path -> op_host_native:: - doc-comment / manual-smoke note refs updated
72 lines
2.6 KiB
Rust
72 lines
2.6 KiB
Rust
//! Spec v19 / plan v7 Task 2 Step 16e: confirm `NativeBackend::draw_text`
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//! actually rasterises glyphs through `jian-skia`'s `textlayout`
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//! feature path. We don't pixel-match specific glyph shapes (font
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//! manager output is platform-specific) — we just check that at least
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//! one non-white pixel lands inside the layout's expected bounding box
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//! after a black-on-white draw.
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use jian_core::scene::Color as JianColor;
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use op_editor_ui::{Point2D, TextLayout};
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use op_host_native::NativeBackend;
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fn count_dark_pixels(pixels: &[u8], stride: usize, x0: i32, y0: i32, x1: i32, y1: i32) -> usize {
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let mut darks = 0;
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for y in y0..y1 {
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for x in x0..x1 {
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let off = (y as usize) * stride + (x as usize) * 4;
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// Treat anything with all RGB < 240 as a glyph hit. Glyph
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// anti-aliasing produces lots of grays; pure white = no
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// hit; saturated colour or near-black = hit.
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if pixels[off] < 240 && pixels[off + 1] < 240 && pixels[off + 2] < 240 {
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darks += 1;
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}
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}
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}
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darks
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}
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#[test]
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fn ascii_and_cjk_text_paints_visible_glyphs() {
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let mut surface =
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skia_safe::surfaces::raster_n32_premul((400, 100)).expect("raster_n32_premul allocated");
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surface.canvas().clear(skia_safe::Color::WHITE);
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let mut backend = NativeBackend::with_dpi(1.0);
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let canvas = surface.canvas();
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// Black "Hello 你好" — exercises both single-line ASCII and the
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// CJK path that `jian-skia`'s `textlayout` ParagraphBuilder owns
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// (single-line fallback also handles ASCII fine; the CJK glyphs
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// pin the textlayout feature being live).
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let layout = TextLayout::single_run(
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"Hello 你好",
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"",
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24.0,
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JianColor::rgb(0, 0, 0),
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Point2D::new(10.0, 30.0),
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);
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backend.draw_text(canvas, &layout, Point2D::ZERO);
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// Read pixels.
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let info = skia_safe::ImageInfo::new(
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(400, 100),
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skia_safe::ColorType::RGBA8888,
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skia_safe::AlphaType::Premul,
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None,
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);
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let stride = 400 * 4;
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let mut pixels = vec![0u8; stride * 100];
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let ok = surface.read_pixels(&info, &mut pixels, stride, (0, 0));
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assert!(ok, "raster read_pixels must succeed");
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// Look for at least N dark pixels inside the band (10, 10)..(380, 70).
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// 24-px text starting at y=30 leaves an ascent ~24 px above the
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// baseline; the band is generous enough to absorb font-manager
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// variation.
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let darks = count_dark_pixels(&pixels, stride, 10, 10, 380, 70);
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assert!(
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darks > 50,
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"expected glyph rasterisation in expected band, got {darks} dark pixels"
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);
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}
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