| Message ID | 1400233901-31785-1-git-send-email-peter.maydell@linaro.org |
|---|---|
| State | New |
| Headers | show |
On Fri, May 16, 2014 at 7:51 PM, Peter Maydell <peter.maydell@linaro.org> wrote: > The pxa2xx palette entry "16bpp plus transparency" format is > xxxxxxxTRRRRR000GGGGGG00BBBBB000, and "18bpp plus transparency" is > xxxxxxxTRRRRRR00GGGGGG00BBBBBB00. > > Correct errors in the code for reading these and converting > them to the internal format. In particular, the buggy code > was attempting to mask out bit 24 of a uint16_t, which > Coverity spotted as an error. > > Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> > --- > This is the remaining uncommitted patch from the set of 8 random > coverity fixes I sent a little while back. > Changes v1->v2: > * use correct mask/shift for R component in 16bpp+transparency > * we need to add 4 to the src ptr, not 2, for the 16bpp+transparency > format, since each palette entry is 32 bits > > hw/display/pxa2xx_lcd.c | 16 ++++++++-------- > 1 file changed, 8 insertions(+), 8 deletions(-) > > diff --git a/hw/display/pxa2xx_lcd.c b/hw/display/pxa2xx_lcd.c > index 80edb70..611fb17 100644 > --- a/hw/display/pxa2xx_lcd.c > +++ b/hw/display/pxa2xx_lcd.c > @@ -620,24 +620,24 @@ static void pxa2xx_palette_parse(PXA2xxLCDState *s, int ch, int bpp) > src += 2; > break; > case 1: /* 16 bpp plus transparency */ > - alpha = *(uint16_t *) src & (1 << 24); > + alpha = *(uint32_t *) src & (1 << 24); > if (s->control[0] & LCCR0_CMS) > - r = g = b = *(uint16_t *) src & 0xff; > + r = g = b = *(uint32_t *) src & 0xff; > else { > - r = (*(uint16_t *) src & 0xf800) >> 8; > - g = (*(uint16_t *) src & 0x07e0) >> 3; > - b = (*(uint16_t *) src & 0x001f) << 3; > + r = (*(uint32_t *) src & 0xf80000) >> 16; > + g = (*(uint32_t *) src & 0x00fc00) >> 8; > + b = (*(uint32_t *) src & 0x0000f8); > } > - src += 2; > + src += 4; > break; > case 2: /* 18 bpp plus transparency */ > alpha = *(uint32_t *) src & (1 << 24); > if (s->control[0] & LCCR0_CMS) > r = g = b = *(uint32_t *) src & 0xff; > else { > - r = (*(uint32_t *) src & 0xf80000) >> 16; > + r = (*(uint32_t *) src & 0xfc0000) >> 16; > g = (*(uint32_t *) src & 0x00fc00) >> 8; > - b = (*(uint32_t *) src & 0x0000f8); > + b = (*(uint32_t *) src & 0x0000fc); > } > src += 4; > break; > -- > 1.9.2 > >
diff --git a/hw/display/pxa2xx_lcd.c b/hw/display/pxa2xx_lcd.c index 80edb70..611fb17 100644 --- a/hw/display/pxa2xx_lcd.c +++ b/hw/display/pxa2xx_lcd.c @@ -620,24 +620,24 @@ static void pxa2xx_palette_parse(PXA2xxLCDState *s, int ch, int bpp) src += 2; break; case 1: /* 16 bpp plus transparency */ - alpha = *(uint16_t *) src & (1 << 24); + alpha = *(uint32_t *) src & (1 << 24); if (s->control[0] & LCCR0_CMS) - r = g = b = *(uint16_t *) src & 0xff; + r = g = b = *(uint32_t *) src & 0xff; else { - r = (*(uint16_t *) src & 0xf800) >> 8; - g = (*(uint16_t *) src & 0x07e0) >> 3; - b = (*(uint16_t *) src & 0x001f) << 3; + r = (*(uint32_t *) src & 0xf80000) >> 16; + g = (*(uint32_t *) src & 0x00fc00) >> 8; + b = (*(uint32_t *) src & 0x0000f8); } - src += 2; + src += 4; break; case 2: /* 18 bpp plus transparency */ alpha = *(uint32_t *) src & (1 << 24); if (s->control[0] & LCCR0_CMS) r = g = b = *(uint32_t *) src & 0xff; else { - r = (*(uint32_t *) src & 0xf80000) >> 16; + r = (*(uint32_t *) src & 0xfc0000) >> 16; g = (*(uint32_t *) src & 0x00fc00) >> 8; - b = (*(uint32_t *) src & 0x0000f8); + b = (*(uint32_t *) src & 0x0000fc); } src += 4; break;
The pxa2xx palette entry "16bpp plus transparency" format is xxxxxxxTRRRRR000GGGGGG00BBBBB000, and "18bpp plus transparency" is xxxxxxxTRRRRRR00GGGGGG00BBBBBB00. Correct errors in the code for reading these and converting them to the internal format. In particular, the buggy code was attempting to mask out bit 24 of a uint16_t, which Coverity spotted as an error. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> --- This is the remaining uncommitted patch from the set of 8 random coverity fixes I sent a little while back. Changes v1->v2: * use correct mask/shift for R component in 16bpp+transparency * we need to add 4 to the src ptr, not 2, for the 16bpp+transparency format, since each palette entry is 32 bits hw/display/pxa2xx_lcd.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)