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correct 2 bit depth display

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Laurent Vivier 2004-12-30 23:06:44 +00:00
parent 6cfef7d2ca
commit d993fdfc02
1 changed files with 6 additions and 5 deletions
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11
second/vga.c
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@ -15,7 +15,7 @@ typedef struct vga_handler {
unsigned char* video;
unsigned char* base;
unsigned long row_bytes; /* in bytes */
unsigned long depth; /* 8, 16 or 32 */
unsigned long depth; /* 4, 8, 16 or 32 */
unsigned long width; /* in pixels */
unsigned long height;
@ -43,14 +43,14 @@ static unsigned char bits_depth2[16] = {
0xff /* 15 : 1111 -> 11111111 */
};
static unsigned char bits_depth4[16] = {
static unsigned char bits_depth4[4] = {
0x00, /* 0 : 00 -> 00000000 */
0x0f, /* 1 : 01 -> 00001111 */
0xf0, /* 2 : 10 -> 11110000 */
0xFF /* 3 : 11 -> 11111111 */
};
static unsigned char bits_depth8[16] = {
static unsigned char bits_depth8[2] = {
0x00, /* 0 : 0 -> 00000000 */
0xff /* 0 : 1 -> 11111111 */
};
@ -81,8 +81,9 @@ draw_byte_2(unsigned char *glyph, unsigned char *base)
{
bits = ~(*glyph++);
*base = bits_depth2[bits >> 4];
*(base+1) = bits_depth2[bits & 0x0F];
base[1] = bits_depth2[bits & 0x0F];
bits = bits >> 4;
base[0] = bits_depth2[bits & 0x0F];
base += vga.row_bytes;
}