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vo: redo video display rectangle calculations

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This code calculates the source/display video rectangle for scaling with
most VOs. It's responsible for clipping the display rectangle against
the screen and adjusting the source rectangle accordingly.

Until now, it assumed that the video was centered on the screen. Change
this so that any rectangle is possible. Basically, the clipping is
extended to two sides (e.g. left and right), instead of handling both at
the same time.

The rounding behavior slightly changes. It seems to be slightly better
than before. On the other hand, the video is not strictly centered
anymore (due to different rounding on either side). When using panscan
controls, the video can "jitter" by 1 or 2 pixels around the center as
the panscan value is changed.
This commit is contained in:
wm4 2013-06-14 23:59:53 +02:00
parent 60631acd29
commit 0e2fb5d8e8
1 changed files with 51 additions and 26 deletions
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77
video/out/vo.c
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@ -466,27 +466,55 @@ static void print_video_rect(struct vo *vo, struct mp_rect src,
dst.x0, dst.y0, vo->dwidth - dst.x1, vo->dheight - dst.y1);
}
static void src_dst_split_scaling(int src_size, int dst_size,
int scaled_src_size, int *src_start,
int *src_end, int *dst_start, int *dst_end)
// Clamp [start, end) to range [0, size) with various fallbacks.
static void clamp_size(int size, int *start, int *end)
{
if (scaled_src_size > dst_size) {
int border = src_size * (scaled_src_size - dst_size) / scaled_src_size;
// round to a multiple of 2, this is at least needed for vo_direct3d
// and ATI cards
border = (border / 2 + 1) & ~1;
*src_start = border;
*src_end = src_size - border;
*dst_start = 0;
*dst_end = dst_size;
} else {
*src_start = 0;
*src_end = src_size;
*dst_start = (dst_size - scaled_src_size) / 2;
*dst_end = *dst_start + scaled_src_size;
*start = FFMAX(0, *start);
*end = FFMIN(size, *end);
if (*start >= *end) {
*start = 0;
*end = 1;
}
}
// Round source to a multiple of 2, this is at least needed for vo_direct3d
// and ATI cards.
#define VID_SRC_ROUND_UP(x) (((x) + 1) & ~1)
static void src_dst_split_scaling(int src_size, int dst_size,
int scaled_src_size,
int *src_start, int *src_end,
int *dst_start, int *dst_end,
int *osd_margin_a, int *osd_margin_b)
{
*src_start = 0;
*src_end = src_size;
*dst_start = (dst_size - scaled_src_size) / 2;
*dst_end = *dst_start + scaled_src_size;
// Distance of screen frame to video
*osd_margin_a = *dst_start;
*osd_margin_b = dst_size - *dst_end;
// Clip to screen
int s_src = *src_end - *src_start;
int s_dst = *dst_end - *dst_start;
if (*dst_start < 0) {
int border = -(*dst_start) * s_src / s_dst;
*src_start += VID_SRC_ROUND_UP(border);
*dst_start = 0;
}
if (*dst_end > dst_size) {
int border = (*dst_end - dst_size) * s_src / s_dst;
*src_end -= VID_SRC_ROUND_UP(border);
*dst_end = dst_size;
}
// For sanity: avoid bothering VOs with corner cases
clamp_size(src_size, src_start, src_end);
clamp_size(dst_size, dst_start, dst_end);
}
// Calculate the appropriate source and destination rectangle to
// get a correctly scaled picture, including pan-scan.
// out_src: visible part of the video
@ -495,6 +523,7 @@ static void src_dst_split_scaling(int src_size, int dst_size,
void vo_get_src_dst_rects(struct vo *vo, struct mp_rect *out_src,
struct mp_rect *out_dst, struct mp_osd_res *out_osd)
{
struct mp_vo_opts *opts = vo->opts;
int src_w = vo->aspdat.orgw;
int src_h = vo->aspdat.orgh;
struct mp_rect dst = {0, 0, vo->dwidth, vo->dheight};
@ -505,19 +534,15 @@ void vo_get_src_dst_rects(struct vo *vo, struct mp_rect *out_src,
.display_par = vo->aspdat.monitor_par,
.video_par = vo->aspdat.par,
};
if (vo->opts->keepaspect) {
if (opts->keepaspect) {
int scaled_width, scaled_height;
aspect_calc_panscan(vo, &scaled_width, &scaled_height);
int border_w = vo->dwidth - scaled_width;
int border_h = vo->dheight - scaled_height;
osd.ml = border_w / 2;
osd.mt = border_h / 2;
osd.mr = border_w - osd.ml;
osd.mb = border_h - osd.mt;
src_dst_split_scaling(src_w, vo->dwidth, scaled_width,
&src.x0, &src.x1, &dst.x0, &dst.x1);
&src.x0, &src.x1, &dst.x0, &dst.x1,
&osd.ml, &osd.mr);
src_dst_split_scaling(src_h, vo->dheight, scaled_height,
&src.y0, &src.y1, &dst.y0, &dst.y1);
&src.y0, &src.y1, &dst.y0, &dst.y1,
&osd.mt, &osd.mb);
}
*out_src = src;