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text: Do not show text that's missing an embedded font #18856

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@kjarosh kjarosh commented Dec 4, 2024

Flash Player does not show any text that requires an embedded font that is missing.

As we now support DefineFont4, we're safe to remove the fallback device font.

@kjarosh kjarosh added text Issues relating to text rendering/input A-core Area: Core player, where no other category fits T-compat Type: Compatibility with Flash Player labels Dec 4, 2024
@kjarosh kjarosh requested a review from Dinnerbone December 4, 2024 13:33
@kjarosh kjarosh marked this pull request as draft December 4, 2024 13:33
@kjarosh kjarosh added the waiting-on-review Waiting on review from a Ruffle team member label Dec 5, 2024
@kjarosh kjarosh marked this pull request as ready for review December 8, 2024 17:36
@@ -862,9 +862,9 @@ impl<'a, 'gc> LayoutContext<'a, 'gc> {
fn left_alignment_offset(span: &TextSpan, is_first_line: bool) -> Twips {
if span.bullet {
if is_first_line {
Twips::from_pixels(35.0 + span.left_margin + span.block_indent + span.indent)
Twips::from_pixels(36.0 + span.left_margin + span.block_indent + span.indent)
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Was this just to make the tests pass better? The change is kinda out of nowhere ;D

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Yes, I added a test that verifies how the bullet behaves when there's no font (to make sure I'm not breaking anything), and it turned out the bullet was misaligned by one pixel 😅

@@ -660,10 +660,10 @@ impl<'a, 'gc> LayoutContext<'a, 'gc> {
{
return font;
}
// TODO: If set to use embedded fonts and we couldn't find any matching font, show nothing
// However - at time of writing, we don't support DefineFont4. If we matched this behaviour,
// then a bunch of SWFs would just show no text suddenly.
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just to be sure, did you test some SWFs like this?

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Generally yes, I made sure that Flash behaves this way and most SWFs from my text collection work.

However, I've just remembered one SWF that used a wrong font: #14740, and unfortunately checking it now, it turns out the text disappears in it. Which makes sense, because now Ruffle somehow fails to load the embedded font and falls back to a device font :/

So I guess there are (and probably will be) cases when Ruffle fails to load an embedded font. Some probably are hard to spot.

@kjarosh kjarosh marked this pull request as draft December 9, 2024 23:28
@kjarosh kjarosh marked this pull request as ready for review December 12, 2024 16:49
Apparently it should be 36px, not 35px.
Flash Player does not show any text that requires
an embedded font that is missing.
This test verifies how bullets are rendered and which font should be used.
This test verifies how FP behaves when we want to get some metrics
related to text that uses a font which is missing.
@kjarosh kjarosh removed the waiting-on-review Waiting on review from a Ruffle team member label Dec 20, 2024
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2 participants