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Scale the font for large resolutions

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This commit is contained in:
Ray Chason
2020-01-25 19:55:05 -05:00
committed by Pasi Kallinen
parent 82a219c227
commit b296196a4a
1 changed files with 81 additions and 5 deletions
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86
sys/msdos/vidvesa.c
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@@ -58,6 +58,8 @@ static void FDECL(vesa_WriteTextRow, (int pixx, int pixy,
struct VesaCharacter const *t_row, unsigned t_row_width));
static boolean FDECL(vesa_GetCharPixel, (int, unsigned, unsigned));
static unsigned char FDECL(vesa_GetCharPixelRow, (int, unsigned, unsigned));
static unsigned long FDECL(vesa_DoublePixels, (unsigned long));
static unsigned long FDECL(vesa_TriplePixels, (unsigned long));
static void FDECL(vesa_WriteStr, (const char *, int, int, int, int));
static unsigned char __far *NDECL(vesa_FontPtrs);
static void FDECL(vesa_process_tile, (struct TileImage *tile));
@@ -1118,6 +1120,23 @@ vesa_Init(void)
vesa_oview_height = iflags.wc_tile_height;
}
/* Use the map font size to set the font size */
/* Supported sizes are 8x16, 16x32, 24x48 and 32x64 */
vesa_char_height = iflags.wc_fontsiz_map;
if (vesa_char_height <= 0 || vesa_char_height > vesa_y_res / 30) {
vesa_char_height = vesa_y_res / 30;
}
if (vesa_char_height < 32) {
vesa_char_height = 16;
} else if (vesa_char_height < 48) {
vesa_char_height = 32;
} else if (vesa_char_height < 64) {
vesa_char_height = 48;
} else {
vesa_char_height = 64;
}
vesa_char_width = vesa_char_height / 2;
/* Process tiles for the current video mode */
vesa_tiles = (unsigned char **) alloc(total_tiles_used * sizeof(void *));
vesa_oview_tiles = (unsigned char **) alloc(total_tiles_used * sizeof(void *));
@@ -1678,26 +1697,83 @@ vesa_GetCharPixelRow(ch, x, y)
int ch;
unsigned x, y;
{
unsigned fnt_width;
unsigned x1;
unsigned char fnt;
size_t offset;
if (x >= vesa_char_width) return FALSE;
if (y >= vesa_char_height) return FALSE;
if (x >= vesa_char_width) return 0;
if (y >= vesa_char_height) return 0;
fnt_width = (vesa_char_width + 7) / 8;
x1 = x / 8;
const unsigned char __far *fp;
if (ch < 0 || 255 < ch) return FALSE;
offset = (ch * vesa_char_height + y) * fnt_width + x1;
offset = ch * 16 + (y * 16 / vesa_char_height);
fp = font;
fnt = READ_ABSOLUTE((fp + offset));
if (vesa_char_width != 8) {
unsigned long fnt2 = fnt;
unsigned width = vesa_char_width;
if (width % 3 == 0) {
fnt2 = vesa_TriplePixels(fnt2);
width /= 3;
}
while (width > 8) {
fnt2 = vesa_DoublePixels(fnt2);
width /= 2;
}
fnt2 <<= 32 - vesa_char_width;
fnt = (unsigned char)(fnt2 >> (24 - 8 * x1));
}
return fnt;
}
/* Scale font pixels horizontally */
static unsigned long
vesa_DoublePixels(fnt)
unsigned long fnt;
{
static const unsigned char double_bits[] = {
0x00, 0x03, 0x0C, 0x0F,
0x30, 0x33, 0x3C, 0x3F,
0xC0, 0xC3, 0xCC, 0xCF,
0xF0, 0xF3, 0xFC, 0xFF
};
unsigned i;
unsigned long fnt2;
fnt2 = 0;
for (i = 0; i < 16; i += 4) {
unsigned long b4 = (fnt >> i) & 0xF;
fnt2 |= (unsigned long)double_bits[b4] << (i * 2);
}
return fnt2;
}
static unsigned long
vesa_TriplePixels(fnt)
unsigned long fnt;
{
static const unsigned short triple_bits[] = {
00000, 00007, 00070, 00077,
00700, 00707, 00770, 00777,
07000, 07007, 07070, 07077,
07700, 07707, 07770, 07777
};
unsigned i;
unsigned long fnt2;
fnt2 = 0;
for (i = 0; i < 11; i += 4) {
unsigned long b4 = (fnt >> i) & 0xF;
fnt2 |= (unsigned long)triple_bits[b4] << (i * 3);
}
return fnt2;
}
/*
* This is the routine that displays a high-res "cell" pointed to by 'gp'
* at the desired location (col,row).