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macfb: fix 24-bit RGB pixel encoding

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According to Apple Technical Note HW26: "Macintosh Quadra Built-In Video" the
in-built framebuffer encodes each 24-bit pixel into 4 bytes. Adjust the 24-bit
RGB pixel encoding accordingly which agrees with the encoding expected by MacOS
when changing into 24-bit colour mode.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20211007221253.29024-12-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Mark Cave-Ayland 2021-10-07 23:12:51 +01:00 committed by Laurent Vivier
parent 57eeaf44ce
commit 432d59c56e
1 changed files with 4 additions and 4 deletions
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8
hw/display/macfb.c
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@ -224,10 +224,10 @@ static void macfb_draw_line24(MacfbState *s, uint8_t *d, uint32_t addr,
int x;
for (x = 0; x < width; x++) {
r = macfb_read_byte(s, addr);
g = macfb_read_byte(s, addr + 1);
b = macfb_read_byte(s, addr + 2);
addr += 3;
r = macfb_read_byte(s, addr + 1);
g = macfb_read_byte(s, addr + 2);
b = macfb_read_byte(s, addr + 3);
addr += 4;
*(uint32_t *)d = rgb_to_pixel32(r, g, b);
d += 4;