| Summary: | bad rendering showing text with CAIRO_ANTIALIAS_BEST | ||
|---|---|---|---|
| Product: | cairo | Reporter: | Jason Crain <jason> |
| Component: | image backend | Assignee: | Chris Wilson <chris> |
| Status: | RESOLVED MOVED | QA Contact: | cairo-bugs mailing list <cairo-bugs> |
| Severity: | blocker | ||
| Priority: | highest | CC: | bique.alexandre, lionel |
| Version: | unspecified | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: |
image of bad text rendering
Test case (source code which generate a png) |
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I can reproduce the problem. I took a quick look at this has "something" to do with _render_glyph_outline() in src/cairo-ft-font.c. Ignoring the actual passed-in value here and forcing something else is enough to trigger this problem or make it go away. So either this is a bug in freetype or _fill_xrender_bitmap in the same source file mis-converts something here. I don't know and I can't figure out more right now. Hi, I'm having the same issue here. The rendering is totally broken. I've produced a test case for it. Created attachment 136971 [details]
Test case (source code which generate a png)
This happens with cairo 1.15.10 and freetype 2.9. I've set it as blocker. -- GitLab Migration Automatic Message -- This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity. You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/cairo/cairo/issues/152. |
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Created attachment 128375 [details] image of bad text rendering Setting the antialias font option to CAIRO_ANTIALIAS_BEST makes text rendering bad, as shown in the following program. cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 80, 40); cairo_t *cr = cairo_create (surface); cairo_move_to (cr, 5, 30); cairo_set_font_size (cr, 30); cairo_font_options_t *font_options = cairo_font_options_create (); cairo_font_options_set_antialias (font_options, CAIRO_ANTIALIAS_BEST); cairo_set_font_options (cr, font_options); cairo_show_text (cr, "hello"); cairo_surface_write_to_png (surface, "out.png");