Disclosure: This article was generated with AI for the FrameSprite team, which has a commercial interest in FrameSprite. It received a separate AI editorial review against the cited sources. Executed synthetic fixtures are identified with their runtime and limits; no other editor, engine, production or performance test is implied.
Load the intended font before baking a game label into a canvas, and redraw the bitmap after any font change. A label rendered with fallback metrics does not automatically repaint itself when a font becomes available later.
Key takeaway: Font availability is an input to the bake. A completed page load does not establish that the specific font face was requested and loaded.
Ask for the exact face you intend to draw
The FontFaceSet.load reference provides an explicit request for a font description. The ready reference describes waiting for the current font-loading and layout work. Use ready after making the intended face relevant; do not treat it as a request to load every registered font.
await document.fonts.load('16px "GameLabelFont"', sampleText);
await document.fonts.ready;
if (!document.fonts.check('16px "GameLabelFont"', sampleText)) {
throw new Error('requested label font is unavailable');
}
ctx.font = '16px "GameLabelFont"';
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.fillText(label, x, y);
This integration example assumes that the face has been registered correctly. Preserve family name, style and weight in both the load request and canvas font setting. A family-name typo can otherwise become a silent fallback rather than a useful error.
Rebuild caches after a font change
If a game caches labels or glyph textures, include the font identity and relevant style in the cache key. Repaint or invalidate the cached bitmap when that input changes. Changing CSS alone does not rewrite pixels that were already baked into an independent canvas.
Also distinguish resource readiness from glyph coverage. A loaded face can still lack a requested character. Do not report document.fonts.check as proof that a font contains every glyph you intend to support. The Canvas text model is the relevant drawing reference, while coverage requires its own validation.
What the local test measured
The authored fixture registered a new family backed by local Arial. Chromium 156.0.8078.4 observed its status change from unloaded to loaded, completed explicit load and ready checks, and rejected a separate deliberately invalid font source. Three assertions ran in the checker.
The result records the actual states; the input identifies the local-font source. No font file was downloaded or redistributed. The test validates readiness and its failure branch only. It did not compare fallback and final glyph metrics, measure a network font race or audit character coverage. The checker is part of the supplied local harness, and a machine without that local font should report the missing prerequisite rather than fabricate a pass.
Report a failed bake instead of silently changing typography
On a font-load failure, choose a documented fallback policy or stop the export with a useful message. Record which face was requested and which fallback was permitted. Do not label a fallback bake as the requested artwork merely because the text remains readable.
Use the font coverage guide for missing characters, the dynamic Bitmap Label guide for runtime glyph-atlas growth, and the contact-sheet review guide for preserving readable labels in the review artifact.
For your actual web-font path, repeat the bake with a controlled delayed load and a failure response. Keep those tests separate from the local-font readiness fixture reported here.
Editorial ownership
Prepared by the workflow team, which has a commercial relationship with this site. This guide was drafted with AI assistance; independent editorial review is recorded separately. Report a technical correction with the relevant input, tool version and observed result.
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