Cairo Toy Font Diagnostic: Fixing Blurry Text and Missing Glyphs
A diagnostic guide to identifying why Cairo's toy font API produces low-resolution output or missing characters, and how to migrate to FreeType for production quality.
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cairoUndefined drawing behavior after cairo_set_matrix receives a non-invertible matrix
Cairo documents that the transformation matrix for cairo_set_matrix must be invertible. When the determinant is zero, the library does not reject, normalize, or raise an API error for the matrix; drawing operations become undefined. The behavior is delegated to each backend rather than resolved inside Cairo, so image, vector, and native surfaces may respond