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gterm: expand font 9th column like VGA

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Implement column expansion like VGA Line Graphics Mode does it, e.g. the
8th column is replicated for characters 0xC0-0xDF. Do this for all
columns above 8 so font sizes like 10x16 are also usable.
This commit is contained in:
Hannu Hartikainen 2021-08-18 16:03:02 +03:00
parent 58d128b9f3
commit cd02860fc1
1 changed files with 15 additions and 5 deletions
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20
stage23/lib/gterm.c
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@ -698,15 +698,15 @@ bool gterm_init(size_t *_rows, size_t *_cols, size_t width, size_t height) {
if (vga_font_bool == NULL || menu_font != NULL) {
vga_font_bool = ext_mem_alloc(VGA_FONT_GLYPHS * vga_font_height * vga_font_width * sizeof(bool));
size_t bitwidth = vga_font_width > 8 ? 8 : vga_font_width;
for (size_t i = 0; i < VGA_FONT_GLYPHS; i++) {
uint8_t *glyph = &vga_font_bits[i * vga_font_height];
for (size_t y = 0; y < vga_font_height; y++) {
// NOTE: the characters in VGA fonts are always at most
// one byte wide. 9 dot wide fonts have 8 dots and one
// empty column, except characters 0xC0-0xDF replicate
// column 9 in Line Graphics Mode. (TODO: implement that)
for (size_t x = 0; x < vga_font_width; x++) {
// NOTE: the characters in VGA fonts are always one byte wide.
// 9 dot wide fonts have 8 dots and one empty column, except
// characters 0xC0-0xDF replicate column 9.
for (size_t x = 0; x < bitwidth; x++) {
size_t offset = i * vga_font_height * vga_font_width + y * vga_font_width + x;
if ((glyph[y] & (0x80 >> x))) {
@ -715,6 +715,16 @@ bool gterm_init(size_t *_rows, size_t *_cols, size_t width, size_t height) {
vga_font_bool[offset] = false;
}
}
// fill columns above 8 like VGA Line Graphics Mode does
for (size_t x = 8; x < vga_font_width; x++) {
size_t offset = i * vga_font_height * vga_font_width + y * vga_font_width + x;
if (i >= 0xC0 && i <= 0xDF) {
vga_font_bool[offset] = (glyph[y] & 1);
} else {
vga_font_bool[offset] = false;
}
}
}
}
}