[Spice-devel] [PATCH] server/red_parse_qxl: fix wrong bitmap_consistent

[Alon Levy]

> Hi,
> 
> On 09/04/2012 06:25 PM, Alon Levy wrote:
> > The bit calculation was wrong for all the paletted types by a
> > factor of
> > between 8 and 1 (SPICE_BITMAP_FMT_{1,4,8}BIT_PLT_{LE,BE})
> > ---
> >   server/red_parse_qxl.c | 31 ++++++++++++++++++++++++++-----
> >   1 file changed, 26 insertions(+), 5 deletions(-)
> >
> > diff --git a/server/red_parse_qxl.c b/server/red_parse_qxl.c
> > index b893add..db2214b 100644
> > --- a/server/red_parse_qxl.c
> > +++ b/server/red_parse_qxl.c
> > @@ -328,14 +328,35 @@ static SpiceChunks
> > *red_get_image_data_chunked(RedMemSlotInfo *slots, int group_
> >       return data;
> >   }
> >
> > +static const char *bitmap_format_to_string(int format)
> > +{
> > +    switch (format) {
> > +    case SPICE_BITMAP_FMT_INVALID: return
> > "SPICE_BITMAP_FMT_INVALID";
> > +    case SPICE_BITMAP_FMT_1BIT_LE: return
> > "SPICE_BITMAP_FMT_1BIT_LE";
> > +    case SPICE_BITMAP_FMT_1BIT_BE: return
> > "SPICE_BITMAP_FMT_1BIT_BE";
> > +    case SPICE_BITMAP_FMT_4BIT_LE: return
> > "SPICE_BITMAP_FMT_4BIT_LE";
> > +    case SPICE_BITMAP_FMT_4BIT_BE: return
> > "SPICE_BITMAP_FMT_4BIT_BE";
> > +    case SPICE_BITMAP_FMT_8BIT: return "SPICE_BITMAP_FMT_8BIT";
> > +    case SPICE_BITMAP_FMT_16BIT: return "SPICE_BITMAP_FMT_16BIT";
> > +    case SPICE_BITMAP_FMT_24BIT: return "SPICE_BITMAP_FMT_24BIT";
> > +    case SPICE_BITMAP_FMT_32BIT: return "SPICE_BITMAP_FMT_32BIT";
> > +    case SPICE_BITMAP_FMT_RGBA: return "SPICE_BITMAP_FMT_RGBA";
> > +    case SPICE_BITMAP_FMT_8BIT_A: return
> > "SPICE_BITMAP_FMT_8BIT_A";
> > +    }
> > +    return "unknown";
> > +}
> > +
> > +static const int MAP_BITMAP_FMT_TO_BITS_PER_PIXEL[] = {0, 1, 1, 4,
> > 4, 8, 16, 24, 32, 32, 8};
> > +
> >   static int bitmap_consistent(SpiceBitmap *bitmap)
> >   {
> > -    int type = MAP_BITMAP_FMT_TO_LZ_IMAGE_TYPE[bitmap->format];
> > -    int bpp = RGB_BYTES_PER_PIXEL[type];
> > +    int bpp = MAP_BITMAP_FMT_TO_BITS_PER_PIXEL[bitmap->format];
> >
> > -    if (bitmap->stride < bitmap->x * bpp) {
> > -        spice_error("image stride too small for width: %d < %d *
> > %d\n",
> > -                    bitmap->stride, bitmap->x, bpp);
> > +    if (bitmap->stride < bitmap->x * bpp / 8) {
> 
> Shouldn't that be:
>         if (bitmap->stride < (bitmap->x * bpp + 7) / 8) {
> 
> ?

Doh, yes. Thanks!

> 
> 
> > +        spice_error("image stride too small for width: %d < %d *
> > %d (%s=%d)\n",
> > +                    bitmap->stride, bitmap->x, bpp,
> > +                    bitmap_format_to_string(bitmap->format),
> > +                    bitmap->format);
> >           return FALSE;
> >       }
> >       return TRUE;
> >
> 
> Regards,
> 
> Hans
>