diff options
Diffstat (limited to 'drivers/gpu/drm/drm_rect.c')
| -rw-r--r-- | drivers/gpu/drm/drm_rect.c | 42 |
1 files changed, 26 insertions, 16 deletions
diff --git a/drivers/gpu/drm/drm_rect.c b/drivers/gpu/drm/drm_rect.c index b8363aaa9032..0460e874896e 100644 --- a/drivers/gpu/drm/drm_rect.c +++ b/drivers/gpu/drm/drm_rect.c @@ -52,9 +52,17 @@ 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 = mul_u32_u32(src, dst - clip); + u64 tmp; + + if (dst == 0) + return 0; + + /* Only clip what we have. Keeps the result bounded. */ + *clip = min(*clip, dst); + + tmp = mul_u32_u32(src, dst - *clip); /* * Round toward 1.0 when clipping so that we don't accidentally @@ -73,11 +81,13 @@ static u32 clip_scaled(u32 src, u32 dst, u32 clip) * @clip: clip rectangle * * Clip rectangle @dst by rectangle @clip. Clip rectangle @src by the - * same amounts multiplied by @hscale and @vscale. + * the corresponding amounts, retaining the vertical and horizontal scaling + * factors from @src to @dst. * * RETURNS: + * * %true if rectangle @dst is still visible after being clipped, - * %false otherwise + * %false otherwise. */ bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst, const struct drm_rect *clip) @@ -87,34 +97,34 @@ 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 = clamp_t(int64_t, src->x2 - new_src_w, INT_MIN, INT_MAX); - dst->x1 = clip->x1; + src->x1 = src->x2 - new_src_w; + 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 = clamp_t(int64_t, src->y2 - new_src_h, INT_MIN, INT_MAX); - dst->y1 = clip->y1; + src->y1 = src->y2 - new_src_h; + 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 = clamp_t(int64_t, src->x1 + new_src_w, INT_MIN, INT_MAX); - dst->x2 = clip->x2; + src->x2 = src->x1 + new_src_w; + 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 = clamp_t(int64_t, src->y1 + new_src_h, INT_MIN, INT_MAX); - dst->y2 = clip->y2; + src->y2 = src->y1 + new_src_h; + dst->y2 -= diff; } return drm_rect_visible(dst); |