1
0
mirror of https://github.com/mpv-player/mpv synced 2024-12-25 08:12:17 +00:00
mpv/video/out/aspect.c
wm4 9c0239ca63 aspect: change license to LGPL
Quite chaotic history, which code being moved, refactored, duplicated,
unified a bunch of times. But I think everything is covered by LGPL
agreements.

In one case, cehoyos (who didn't agree) applied a patch by someone who
agreed, but didn't change anything (except weirdly adding German
translations). In another case, cehoyos moved code covered by LGPL
agreements (without changing it), which was later used for some other
code. We consider both cases not relevant for copyright.

win_state.c/.h is similar, but pending for reply by the author of
2ab259e68 (I guess).
2017-06-17 17:08:51 +02:00

175 lines
6.0 KiB
C

/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
/* Stuff for correct aspect scaling. */
#include "aspect.h"
#include "math.h"
#include "vo.h"
#include "common/msg.h"
#include "options/options.h"
#include "video/mp_image.h"
#include "vo.h"
#include "sub/osd.h"
static void aspect_calc_panscan(struct mp_vo_opts *opts,
int w, int h, int d_w, int d_h, int unscaled,
int window_w, int window_h, double monitor_par,
int *out_w, int *out_h)
{
w *= monitor_par;
int fwidth = window_w;
int fheight = (float)window_w / d_w * d_h / monitor_par;
if (fheight > window_h || fheight < h) {
int tmpw = (float)window_h / d_h * d_w * monitor_par;
if (tmpw <= window_w) {
fheight = window_h;
fwidth = tmpw;
}
}
int vo_panscan_area = window_h - fheight;
double f_w = fwidth / (double)fheight;
double f_h = 1;
if (vo_panscan_area == 0) {
vo_panscan_area = window_w - fwidth;
f_w = 1;
f_h = fheight / (double)fwidth;
}
if (unscaled) {
vo_panscan_area = 0;
if (unscaled != 2 || (d_w <= window_w && d_h <= window_h)) {
fwidth = d_w * monitor_par;
fheight = d_h;
}
}
*out_w = fwidth + vo_panscan_area * opts->panscan * f_w;
*out_h = fheight + vo_panscan_area * opts->panscan * f_h;
}
// Clamp [start, end) to range [0, size) with various fallbacks.
static void clamp_size(int size, int *start, int *end)
{
*start = MPMAX(0, *start);
*end = MPMIN(size, *end);
if (*start >= *end) {
*start = 0;
*end = 1;
}
}
static void src_dst_split_scaling(int src_size, int dst_size,
int scaled_src_size,
float zoom, float align, float pan,
int *src_start, int *src_end,
int *dst_start, int *dst_end,
int *osd_margin_a, int *osd_margin_b)
{
scaled_src_size *= powf(2, zoom);
align = (align + 1) / 2;
*src_start = 0;
*src_end = src_size;
*dst_start = (dst_size - scaled_src_size) * align + pan * scaled_src_size;
*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 += border;
*dst_start = 0;
}
if (*dst_end > dst_size) {
int border = (*dst_end - dst_size) * s_src / s_dst;
*src_end -= 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);
}
void mp_get_src_dst_rects(struct mp_log *log, struct mp_vo_opts *opts,
int vo_caps, struct mp_image_params *video,
int window_w, int window_h, double monitor_par,
struct mp_rect *out_src,
struct mp_rect *out_dst,
struct mp_osd_res *out_osd)
{
int src_w = video->w;
int src_h = video->h;
int src_dw, src_dh;
mp_image_params_get_dsize(video, &src_dw, &src_dh);
if (video->rotate % 180 == 90 && (vo_caps & VO_CAP_ROTATE90)) {
MPSWAP(int, src_w, src_h);
MPSWAP(int, src_dw, src_dh);
}
window_w = MPMAX(1, window_w);
window_h = MPMAX(1, window_h);
struct mp_rect dst = {0, 0, window_w, window_h};
struct mp_rect src = {0, 0, src_w, src_h};
struct mp_osd_res osd = {
.w = window_w,
.h = window_h,
.display_par = monitor_par,
};
if (opts->keepaspect) {
int scaled_width, scaled_height;
aspect_calc_panscan(opts, src_w, src_h, src_dw, src_dh, opts->unscaled,
window_w, window_h, monitor_par,
&scaled_width, &scaled_height);
src_dst_split_scaling(src_w, window_w, scaled_width,
opts->zoom, opts->align_x, opts->pan_x,
&src.x0, &src.x1, &dst.x0, &dst.x1,
&osd.ml, &osd.mr);
src_dst_split_scaling(src_h, window_h, scaled_height,
opts->zoom, opts->align_y, opts->pan_y,
&src.y0, &src.y1, &dst.y0, &dst.y1,
&osd.mt, &osd.mb);
}
*out_src = src;
*out_dst = dst;
*out_osd = osd;
int sw = src.x1 - src.x0, sh = src.y1 - src.y0;
int dw = dst.x1 - dst.x0, dh = dst.y1 - dst.y0;
mp_verbose(log, "Window size: %dx%d\n",
window_w, window_h);
mp_verbose(log, "Video source: %dx%d (%d:%d)\n",
video->w, video->h, video->p_w, video->p_h);
mp_verbose(log, "Video display: (%d, %d) %dx%d -> (%d, %d) %dx%d\n",
src.x0, src.y0, sw, sh, dst.x0, dst.y0, dw, dh);
mp_verbose(log, "Video scale: %f/%f\n",
(double)dw / sw, (double)dh / sh);
mp_verbose(log, "OSD borders: l=%d t=%d r=%d b=%d\n",
osd.ml, osd.mt, osd.mr, osd.mb);
mp_verbose(log, "Video borders: l=%d t=%d r=%d b=%d\n",
dst.x0, dst.y0, window_w - dst.x1, window_h - dst.y1);
}