mirror of
https://github.com/mpv-player/mpv
synced 2024-12-27 09:32:40 +00:00
0b4790f23f
Semantics a bit questionable. This is done for the OSC (next commit), and a comment added the manpage explicitly states this. Meaning this is probably garbage and needs to revisit when the OSC changes and/or someone wants to use this margin feature for something else. Not sure about the subtitle thing. It's imaginable that someone uses these options to create empty borders for subtitles on the bottom, so subtitles should be located there. On the other hand, this gives a rather unpolished user experience when using the (later added) OSC feature to not overlap with the video. There's not much of a point if the OSC still overlaps the video. However, I'm too lazy to think about this, so it stays like it is.
213 lines
7.1 KiB
C
213 lines
7.1 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Stuff for correct aspect scaling. */
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#include "aspect.h"
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#include "math.h"
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#include "vo.h"
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#include "common/msg.h"
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#include "options/options.h"
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#include "video/mp_image.h"
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#include "vo.h"
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#include "sub/osd.h"
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static void aspect_calc_panscan(struct mp_vo_opts *opts,
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int w, int h, int d_w, int d_h, int unscaled,
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int window_w, int window_h, double monitor_par,
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int *out_w, int *out_h)
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{
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w *= monitor_par;
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int fwidth = window_w;
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int fheight = (float)window_w / d_w * d_h / monitor_par;
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if (fheight > window_h || fheight < h) {
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int tmpw = (float)window_h / d_h * d_w * monitor_par;
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if (tmpw <= window_w) {
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fheight = window_h;
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fwidth = tmpw;
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}
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}
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int vo_panscan_area = window_h - fheight;
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double f_w = fwidth / (double)MPMAX(fheight, 1);
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double f_h = 1;
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if (vo_panscan_area == 0) {
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vo_panscan_area = window_w - fwidth;
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f_w = 1;
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f_h = fheight / (double)MPMAX(fwidth, 1);
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}
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if (unscaled) {
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vo_panscan_area = 0;
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if (unscaled != 2 || (d_w <= window_w && d_h <= window_h)) {
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fwidth = d_w * monitor_par;
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fheight = d_h;
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}
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}
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*out_w = fwidth + vo_panscan_area * opts->panscan * f_w;
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*out_h = fheight + vo_panscan_area * opts->panscan * f_h;
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}
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// Clamp [start, end) to range [0, size) with various fallbacks.
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static void clamp_size(int size, int *start, int *end)
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{
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*start = MPMAX(0, *start);
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*end = MPMIN(size, *end);
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if (*start >= *end) {
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*start = 0;
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*end = 1;
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}
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}
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static void src_dst_split_scaling(int src_size, int dst_size,
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int scaled_src_size,
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float zoom, float align, float pan,
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int *src_start, int *src_end,
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int *dst_start, int *dst_end,
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int *osd_margin_a, int *osd_margin_b)
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{
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scaled_src_size *= powf(2, zoom);
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align = (align + 1) / 2;
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*src_start = 0;
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*src_end = src_size;
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*dst_start = (dst_size - scaled_src_size) * align + pan * scaled_src_size;
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*dst_end = *dst_start + scaled_src_size;
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// Clip to screen
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int s_src = *src_end - *src_start;
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int s_dst = *dst_end - *dst_start;
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if (*dst_start < 0) {
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int border = -(*dst_start) * s_src / s_dst;
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*src_start += border;
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*dst_start = 0;
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}
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if (*dst_end > dst_size) {
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int border = (*dst_end - dst_size) * s_src / s_dst;
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*src_end -= border;
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*dst_end = dst_size;
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}
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// For sanity: avoid bothering VOs with corner cases
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clamp_size(src_size, src_start, src_end);
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clamp_size(dst_size, dst_start, dst_end);
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// Distance of screen frame to video
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*osd_margin_a = *dst_start;
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*osd_margin_b = dst_size - *dst_end;
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}
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static void calc_margin(float opts[2], int out[2], int size)
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{
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out[0] = MPCLAMP((int)(opts[0] * size), 0, size);
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out[1] = MPCLAMP((int)(opts[1] * size), 0, size);
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if (out[0] + out[1] >= size) {
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// This case is not really supported. Show an error by 1 pixel.
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out[0] = 0;
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out[1] = MPMAX(0, size - 1);
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}
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}
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void mp_get_src_dst_rects(struct mp_log *log, struct mp_vo_opts *opts,
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int vo_caps, struct mp_image_params *video,
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int window_w, int window_h, double monitor_par,
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struct mp_rect *out_src,
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struct mp_rect *out_dst,
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struct mp_osd_res *out_osd)
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{
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int src_w = video->w;
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int src_h = video->h;
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int src_dw, src_dh;
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mp_image_params_get_dsize(video, &src_dw, &src_dh);
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if (video->rotate % 180 == 90 && (vo_caps & VO_CAP_ROTATE90)) {
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MPSWAP(int, src_w, src_h);
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MPSWAP(int, src_dw, src_dh);
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}
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window_w = MPMAX(1, window_w);
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window_h = MPMAX(1, window_h);
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int margin_x[2] = {0};
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int margin_y[2] = {0};
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if (opts->keepaspect) {
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calc_margin(opts->margin_x, margin_x, window_w);
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calc_margin(opts->margin_y, margin_y, window_h);
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}
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int vid_window_w = window_w - margin_x[0] - margin_x[1];
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int vid_window_h = window_h - margin_y[0] - margin_y[1];
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struct mp_rect dst = {0, 0, window_w, window_h};
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struct mp_rect src = {0, 0, src_w, src_h};
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struct mp_osd_res osd = {
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.w = window_w,
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.h = window_h,
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.display_par = monitor_par,
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};
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if (opts->keepaspect) {
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int scaled_width, scaled_height;
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aspect_calc_panscan(opts, src_w, src_h, src_dw, src_dh, opts->unscaled,
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vid_window_w, vid_window_h, monitor_par,
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&scaled_width, &scaled_height);
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src_dst_split_scaling(src_w, vid_window_w, scaled_width,
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opts->zoom, opts->align_x, opts->pan_x,
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&src.x0, &src.x1, &dst.x0, &dst.x1,
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&osd.ml, &osd.mr);
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src_dst_split_scaling(src_h, vid_window_h, scaled_height,
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opts->zoom, opts->align_y, opts->pan_y,
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&src.y0, &src.y1, &dst.y0, &dst.y1,
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&osd.mt, &osd.mb);
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}
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dst.x0 += margin_x[0];
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dst.y0 += margin_y[0];
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dst.x1 += margin_x[0];
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dst.y1 += margin_y[0];
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// OSD really uses the full window, but was computed on the margin-cut
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// video sub-window. Correct it to the full window.
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osd.ml += margin_x[0];
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osd.mr += margin_x[1];
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osd.mt += margin_y[0];
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osd.mb += margin_y[1];
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*out_src = src;
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*out_dst = dst;
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*out_osd = osd;
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int sw = src.x1 - src.x0, sh = src.y1 - src.y0;
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int dw = dst.x1 - dst.x0, dh = dst.y1 - dst.y0;
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mp_verbose(log, "Window size: %dx%d (Borders: l=%d t=%d r=%d b=%d)\n",
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window_w, window_h,
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margin_x[0], margin_y[0], margin_x[1], margin_y[1]);
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mp_verbose(log, "Video source: %dx%d (%d:%d)\n",
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video->w, video->h, video->p_w, video->p_h);
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mp_verbose(log, "Video display: (%d, %d) %dx%d -> (%d, %d) %dx%d\n",
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src.x0, src.y0, sw, sh, dst.x0, dst.y0, dw, dh);
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mp_verbose(log, "Video scale: %f/%f\n",
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(double)dw / sw, (double)dh / sh);
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mp_verbose(log, "OSD borders: l=%d t=%d r=%d b=%d\n",
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osd.ml, osd.mt, osd.mr, osd.mb);
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mp_verbose(log, "Video borders: l=%d t=%d r=%d b=%d\n",
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dst.x0, dst.y0, window_w - dst.x1, window_h - dst.y1);
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}
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