The TrueType console driver calls malloc/free for every character
rendered, which causes significant memory fragmentation and allocation
traffic.
Add CONFIG_CONSOLE_TRUETYPE_GLYPH_BUF to enable a pre-allocated buffer
in the driver's private data. The buffer starts at 4KB and grows via
realloc() as needed. When rendering a glyph, use this buffer to avoid
malloc/free for normal characters.
The buffer is allocated lazily after relocation to avoid consuming
early malloc space before the full heap is available.
Add CONFIG_VIDEO_GLYPH_STATS (default y on sandbox) to track the number
of glyphs rendered. Use 'font info' to view the count.
Series-changes: 2
- Rename the Kconfig to just enable the feature: always allocate
Co-developed-by: Claude Opus 4 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
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