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efi: convert pixel format to bootscreen color channel

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This commit is contained in:
cinap_lenrek 2014-10-18 18:48:56 +02:00
parent 6aa6e9fc8b
commit 99e004c72e
2 changed files with 93 additions and 19 deletions
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104
sys/src/boot/efi/efi.c
View file

@ -199,6 +199,87 @@ acpiconf(char **cfg)
}
}
static int
topbit(ulong mask)
{
int bit;
for(bit=1; bit < 32 && (mask >> bit) != 0; bit++)
;
return bit;
}
static int
lowbit(ulong mask)
{
int bit;
for(bit=0; bit < 32 && (mask & (1<<bit)) == 0; bit++)
;
return bit;
}
static char*
modeinfostr(EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *info, char *s)
{
ulong mr, mg, mb, mx, mc;
int n, depth;
switch(info->PixelFormat){
default:
return nil; /* unsupported */
case PixelRedGreenBlueReserved8BitPerColor:
mr = 0x000000ff;
mg = 0x0000ff00;
mb = 0x00ff0000;
mx = 0xff000000;
break;
case PixelBlueGreenRedReserved8BitPerColor:
mb = 0x000000ff;
mg = 0x0000ff00;
mr = 0x00ff0000;
mx = 0xff000000;
break;
case PixelBitMask:
mr = info->PixelInformation.RedMask;
mg = info->PixelInformation.GreenMask;
mb = info->PixelInformation.BlueMask;
mx = info->PixelInformation.ReservedMask;
break;
}
depth = topbit(mr | mg | mb | mx);
s = decfmt(s, 0, info->PixelsPerScanLine), *s++ = 'x';
s = decfmt(s, 0, info->VerticalResolution), *s++ = 'x';
s = decfmt(s, 0, depth), *s++ = ' ';
while(depth > 0){
if(depth == topbit(mr)){
mc = mr;
*s++ = 'r';
} else if(depth == topbit(mg)){
mc = mg;
*s++ = 'g';
} else if(depth == topbit(mb)){
mc = mb;
*s++ = 'b';
} else if(depth == topbit(mx)){
mc = mx;
*s++ = 'x';
} else {
break;
}
n = depth - lowbit(mc);
s = decfmt(s, 0, n);
depth -= n;
}
*s = '\0';
return s;
}
static void
screenconf(char **cfg)
{
@ -210,32 +291,17 @@ screenconf(char **cfg)
s = *cfg;
memmove(s, "*bootscreen=", 12), s += 12;
s = decfmt(s, 0, gop->Mode->Info->PixelsPerScanLine), *s++ = 'x';
s = decfmt(s, 0, gop->Mode->Info->VerticalResolution), *s++ = 'x';
s = decfmt(s, 0, 32), *s++ = ' ';
memmove(s, "x8r8g8b8", 8), s += 8;
if((s = modeinfostr(gop->Mode->Info, s)) == nil){
**cfg = '\0';
return;
}
*s++ = ' ';
*s++ = '0', *s++ = 'x';
s = hexfmt(s, 0, gop->Mode->FrameBufferBase), *s++ = '\n';
*s = '\0';
print(*cfg);
*cfg = s;
/*
Print(" Width="), Printi(gop->Mode->Info->HorizontalResolution), Print("\r\n");
Print(" Height="), Printi(gop->Mode->Info->VerticalResolution), Print("\r\n");
Print(" Stride="), Printi(gop->Mode->Info->PixelsPerScanLine), Print("\r\n");
Print(" PixelFormat="), Printi(gop->Mode->Info->PixelFormat), Print("\r\n");
Print(" RedMask="), Printi(gop->Mode->Info->PixelInformation.RedMask), Print("\r\n");
Print(" GreenMask="), Printi(gop->Mode->Info->PixelInformation.GreenMask), Print("\r\n");
Print(" BlueMask="), Printi(gop->Mode->Info->PixelInformation.BlueMask), Print("\r\n");
Print(" FrameBufferBase="), Printi(gop->Mode->FrameBufferBase), Print("\r\n");
Print(" FrameBufferSize="), Printi(gop->Mode->FrameBufferSize), Print("\r\n");
*/
}
void

8
sys/src/boot/efi/efi.h
View file

@ -48,6 +48,14 @@ typedef struct {
UINT32 ReservedMask;
} EFI_PIXEL_BITMASK;
enum {
PixelRedGreenBlueReserved8BitPerColor,
PixelBlueGreenRedReserved8BitPerColor,
PixelBitMask,
PixelBltOnly,
PixelFormatMax,
};
typedef struct {
UINT32 Version;
UINT32 HorizontalResolution;