choosing a font with Arabic glyphs is necessary, but it is not enough. When an image library draws Arabic text without shaping and right-to-left processing, the letters may appear disconnected or in the wrong order.
Why it happens
Arabic image rendering has two separate requirements:
- Glyph coverage: the selected font must contain the Arabic characters being drawn.
- Text shaping and direction: the renderer must choose the correct connected letter forms and handle right-to-left order.
A missing glyph usually appears as an empty box or replacement symbol. A shaping problem is different: the letters exist, but the word still looks broken.
Why a compatible font is not enough
Arabic letters can change form depending on whether they appear alone, at the start, in the middle, or at the end of a word. Text engines normally apply this shaping automatically.
Low-level image APIs may only draw the Unicode characters they receive. For example, a basic PHP GD and FreeType path can load an Arabic-capable font yet still render a word as separate letters. It may also lack the bidirectional processing needed to display the word in the correct visual order.
A practical rendering process
- Detect the script. Use a Unicode-aware check rather than a list of individual Arabic characters.
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Select a font with verified glyph coverage. Inspect bundled fonts before adding another dependency.
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Shape complete Arabic words. Convert characters to the correct contextual forms before drawing.
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Apply right-to-left ordering. Use a bidirectional text implementation instead of simply reversing bytes or characters.
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Test the generated image. Verify connected forms, word order, centering, and mixed-language behavior.
Single letters and full words are different
A grid that draws one Arabic letter per cell may only need the correct font because each cell contains an isolated character. A full answer or label needs shaping because neighboring letters affect one another.
This distinction helps keep a fix narrow: the font-selection logic can support Arabic everywhere, while shaping is applied only where complete Arabic text is rendered.
Common mistakes
- Problem: installing another font without checking the existing one.
Fix: inspect the current font’s glyph coverage first. -
Problem: reversing the string to simulate right-to-left text.
Fix: use proper shaping and bidirectional processing. -
Problem: applying an Arabic-only transformation to mixed text.
Fix: preserve mixed-direction text unless the implementation fully supports the Unicode bidirectional algorithm. -
Problem: testing only the source string.
Fix: inspect the final pixels because layout and font behavior appear only during rendering.
Keep one owner for layout
Prefer a renderer that handles shaping and bidirectional layout together when available. If the renderer already performs these steps, feeding it pre-shaped or visually reordered text can process the string twice and break it. Keep source text in logical Unicode order and test punctuation, numbers, diacritics, and mixed Latin text in the final image.
Correct Arabic image output is a text-layout problem, not only a font problem. The next action is to test one known Arabic word through the full image pipeline and confirm both connected letters and right-to-left order.