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Fix the only known remaining (libvgl) bug for 24-bit modes, and enable

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support for 24-bit modes.

The non-segmented case has worked for a long time, but the segmented
case could never have worked since 24-bit accesses may cross a window
boundary but the window was not changed in the middle of the specialized
24-bit accesses for writing a single pixel.
This commit is contained in:
Bruce Evans 2019-04-26 13:49:06 +00:00
parent a73b15498c
commit ea0a990509
2 changed files with 20 additions and 6 deletions
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4
lib/libvgl/main.c
View File

@ -42,8 +42,6 @@ __FBSDID("$FreeBSD$");
#include <sys/consio.h>
#include "vgl.h"
/* XXX Direct Color 24bits modes unsupported */
#define min(x, y) (((x) < (y)) ? (x) : (y))
#define max(x, y) (((x) > (y)) ? (x) : (y))
@ -223,11 +221,9 @@ VGLInit(int mode)
case 2:
VGLDisplay->Type = VIDBUF16;
break;
#if notyet
case 3:
VGLDisplay->Type = VIDBUF24;
break;
#endif
case 4:
VGLDisplay->Type = VIDBUF32;
break;

22
lib/libvgl/simple.c
View File

@ -51,7 +51,7 @@ static byte VGLSavePaletteBlue[256];
void
VGLSetXY(VGLBitmap *object, int x, int y, u_long color)
{
int offset, undermouse;
int offset, soffset, undermouse;
VGLCheckSwitch();
if (x>=0 && x<object->VXsize && y>=0 && y<object->VYsize) {
@ -67,7 +67,6 @@ VGLSetXY(VGLBitmap *object, int x, int y, u_long color)
switch (object->Type) {
case VIDBUF8S:
case VIDBUF16S:
case VIDBUF24S:
case VIDBUF32S:
offset = VGLSetSegment(offset);
/* FALLTHROUGH */
@ -92,6 +91,25 @@ VGLSetXY(VGLBitmap *object, int x, int y, u_long color)
break;
}
break;
case VIDBUF24S:
soffset = VGLSetSegment(offset);
color = htole32(color);
switch (VGLAdpInfo.va_window_size - soffset) {
case 1:
memcpy(&object->Bitmap[soffset], &color, 1);
soffset = VGLSetSegment(offset + 1);
memcpy(&object->Bitmap[soffset], (byte *)&color + 1, 2);
break;
case 2:
memcpy(&object->Bitmap[soffset], &color, 2);
soffset = VGLSetSegment(offset + 2);
memcpy(&object->Bitmap[soffset], (byte *)&color + 2, 1);
break;
default:
memcpy(&object->Bitmap[soffset], &color, 3);
break;
}
break;
case VIDBUF8X:
outb(0x3c4, 0x02);
outb(0x3c5, 0x01 << (x&0x3));