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video: truetype: Use pre-allocated buffer for glyph rendering

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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>
This commit is contained in:
Simon Glass
2025-12-08 16:35:17 -07:00
parent 0987da845d
commit 69d2f4ab58
6 changed files with 159 additions and 9 deletions
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24
cmd/font.c
View File

@@ -11,6 +11,16 @@
#include <video.h>
#include <video_console.h>
#if CONFIG_IS_ENABLED(VIDEO_GLYPH_STATS)
static int do_font_info(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
printf("glyphs rendered: %u\n", gd->glyph_count);
return 0;
}
#endif
static int do_font_list(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
@@ -75,12 +85,22 @@ static int do_font_size(struct cmd_tbl *cmdtp, int flag, int argc,
return 0;
}
#if CONFIG_IS_ENABLED(VIDEO_GLYPH_STATS)
#define FONT_INFO_HELP "\nfont info - show glyph rendering statistics"
#define FONT_INFO_SUB , U_BOOT_SUBCMD_MKENT(info, 1, 1, do_font_info)
#else
#define FONT_INFO_HELP
#define FONT_INFO_SUB
#endif
U_BOOT_LONGHELP(font,
"list - list available fonts\n"
"font select <name> [<size>] - select font to use\n"
"font size <size> - select font size to");
"font size <size> - select font size to"
FONT_INFO_HELP);
U_BOOT_CMD_WITH_SUBCMDS(font, "Fonts", font_help_text,
U_BOOT_SUBCMD_MKENT(list, 1, 1, do_font_list),
U_BOOT_SUBCMD_MKENT(select, 3, 1, do_font_select),
U_BOOT_SUBCMD_MKENT(size, 2, 1, do_font_size));
U_BOOT_SUBCMD_MKENT(size, 2, 1, do_font_size)
FONT_INFO_SUB);