On Wed, Nov 20, 2019 at 06:25:12PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> Now that we've constrained the clipped source rectangle such
> that it can't have negative dimensions doing the same for the
> dst rectangle seems appropriate. Should at least result in
> the clipped src and dst rectangles being a bit more consistent
> with each other.
>
> Cc: Benjamin Gaignard <benjamin.gaignard@xxxxxx>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
selftests for this stuff? Looks like the prime example, write testcase
proving code is busted, fix it, everyone celebrate?
-Daniel
> ---
> drivers/gpu/drm/drm_rect.c | 22 +++++++++++-----------
> 1 file changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_rect.c b/drivers/gpu/drm/drm_rect.c
> index 7762b6e9278d..229325fcf333 100644
> --- a/drivers/gpu/drm/drm_rect.c
> +++ b/drivers/gpu/drm/drm_rect.c
> @@ -52,14 +52,14 @@ bool drm_rect_intersect(struct drm_rect *r1, const struct drm_rect *r2)
> }
> EXPORT_SYMBOL(drm_rect_intersect);
>
> -static u32 clip_scaled(u32 src, u32 dst, u32 clip)
> +static u32 clip_scaled(int src, int dst, int *clip)
> {
> u64 tmp;
>
> /* Only clip what we have. Keeps the result bounded as well. */
> - clip = min(clip, dst);
> + *clip = min(*clip, dst);
>
> - tmp = mul_u32_u32(src, dst - clip);
> + tmp = mul_u32_u32(src, dst - *clip);
>
> /*
> * Round toward 1.0 when clipping so that we don't accidentally
> @@ -92,34 +92,34 @@ bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
> diff = clip->x1 - dst->x1;
> if (diff > 0) {
> u32 new_src_w = clip_scaled(drm_rect_width(src),
> - drm_rect_width(dst), diff);
> + drm_rect_width(dst), &diff);
>
> src->x1 = src->x2 - new_src_w;
> - dst->x1 = clip->x1;
> + dst->x1 += diff;
> }
> diff = clip->y1 - dst->y1;
> if (diff > 0) {
> u32 new_src_h = clip_scaled(drm_rect_height(src),
> - drm_rect_height(dst), diff);
> + drm_rect_height(dst), &diff);
>
> src->y1 = src->y2 - new_src_h;
> - dst->y1 = clip->y1;
> + dst->y1 += diff;
> }
> diff = dst->x2 - clip->x2;
> if (diff > 0) {
> u32 new_src_w = clip_scaled(drm_rect_width(src),
> - drm_rect_width(dst), diff);
> + drm_rect_width(dst), &diff);
>
> src->x2 = src->x1 + new_src_w;
> - dst->x2 = clip->x2;
> + dst->x2 -= diff;
> }
> diff = dst->y2 - clip->y2;
> if (diff > 0) {
> u32 new_src_h = clip_scaled(drm_rect_height(src),
> - drm_rect_height(dst), diff);
> + drm_rect_height(dst), &diff);
>
> src->y2 = src->y1 + new_src_h;
> - dst->y2 = clip->y2;
> + dst->y2 -= diff;
> }
>
> return drm_rect_visible(dst);
> --
> 2.23.0
>
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> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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