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