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rockboy: fix wrong colors on some targets

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This bug was found and located by a forum user, see
https://forums.rockbox.org/index.php/topic,54776.0.html

The old code used the FB_SCALARPACK macro which doesn't
respect swapped byte order.
Using FB_RGBPACK fixes it and furthermore makes the
fb.cc[] array superfluous.
I added a small optimization for 16 bit targets, since
the gameboy colors almost fit perfectly (5 bit per color).

Change-Id: If96b3943cb4ab902b880ff3d471add25e138fe8e
This commit is contained in:
Sebastian Leonhardt 2025-11-20 22:43:28 +01:00 • committed by Solomon Peachy
parent e0cc87fd3f
commit 5e7a4290b2
3 changed files with 14 additions and 33 deletions
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22
apps/plugins/rockboy/lcd.c
View file

@ -1020,21 +1020,23 @@ static void updatepalette(int i)
fb_data px;
c = (lcd.pal[i<<1] | ((int)lcd.pal[(i<<1)|1] << 8)) & 0x7FFF;
#if LCD_PIXELFORMAT == RGB565 || LCD_PIXELFORMAT == RGB565SWAPPED
/* extract color channels to 5 bit red and blue, and 6 bit green */
r = c & 0x001F;
g = (c & 0x03E0) >> 4;
b = c >> 10;
g |= (g >> 5);
px = FB_RGBPACK_LCD(r, g, b);
#else
/* extract color channels and normalize to 8-bit */
r = (c & 0x001F) << 3;
g = (c & 0x03E0) >> 2;
b = (c & 0x7C00) >> 7;
b = c >> 7;
r |= (r >> 5);
g |= (g >> 5);
b |= (b >> 5);
r = (r >> fb.cc[0].r) << fb.cc[0].l;
g = (g >> fb.cc[1].r) << fb.cc[1].l;
b = (b >> fb.cc[2].r) << fb.cc[2].l;
c = r|g|b;
px = FB_SCALARPACK_LCD(c);
px = FB_RGBPACK(r, g, b);
#endif
/* updatepalette might get called, but the pallete does not necessarily
* need to be updated.
*/