Fixed stroke on FreeType < 2.9 #4401
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This was referenced Mar 6, 2021
This was referenced Mar 17, 2021
Bump pillow from 4.0.0 to 7.1.0 in /study_material/intro-to-tensorflow
tiandiao123/deep_learning#121
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Resolves #4366
The issue reported that the stroke was incorrectly positioned when writing the text 'Sample Overlay Text'. Testing for that issue, I found that it was only happening for FreeType < 2.9 - all three of the values being used in calculating the ascender (
bitmap.rows,glyph_slot->bitmap_topandPIXEL(glyph_info[i].y_offset)) were zero. I find that always passing inFT_LOAD_RENDERwhen loading the glyphs for those calculations fixes that.However, FreeType < 2.9 is a scenario in our test environments, so why wasn't this picked up? It's because 'Sample Overlay Text' has descenders - 'p' and 'y' go below the baseline of the text. The current stroke text tests involve 'A', 'A\nB' and 'ABC\nAaaa' - no descenders.