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[fbcon] Support Unicode character output

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Accumulate UTF-8 characters in fbcon_putchar(), and require the frame
buffer console's .glyph() method to accept Unicode character values.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2022-03-14 22:38:24 +00:00
parent 2ff3385e00
commit ba93c9134c
4 changed files with 161 additions and 74 deletions
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25
src/arch/x86/interface/pcbios/vesafb.c
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@@ -78,6 +78,15 @@ struct console_driver bios_console __attribute__ (( weak ));
/** Font corresponding to selected character width and height */
#define VESAFB_FONT VBE_FONT_8x16
/** Number of ASCII glyphs within the font */
#define VESAFB_ASCII 128
/** Glyph to render for non-ASCII characters
*
* We choose to use one of the box-drawing glyphs.
*/
#define VESAFB_UNKNOWN 0xfe
/* Forward declaration */
struct console_driver vesafb_console __console_driver;
@@ -130,12 +139,24 @@ static int vesafb_rc ( unsigned int status ) {
/**
* Get character glyph
*
* @v character Character
* @v character Unicode character
* @v glyph Character glyph to fill in
*/
static void vesafb_glyph ( unsigned int character, uint8_t *glyph ) {
size_t offset = ( character * VESAFB_CHAR_HEIGHT );
unsigned int index;
size_t offset;
/* Identify glyph */
if ( character < VESAFB_ASCII ) {
/* ASCII character: use corresponding glyph */
index = character;
} else {
/* Non-ASCII character: use "unknown" glyph */
index = VESAFB_UNKNOWN;
}
/* Copy glyph from BIOS font table */
offset = ( index * VESAFB_CHAR_HEIGHT );
copy_from_real ( glyph, vesafb.glyphs.segment,
( vesafb.glyphs.offset + offset ), VESAFB_CHAR_HEIGHT);
}