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https://github.com/mpv-player/mpv
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cd401555fa
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@2251 b3059339-0415-0410-9bf9-f77b7e298cf2
78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/* Stuff for correct aspect scaling. */
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#include "aspect.h"
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//#define ASPECT_DEBUG
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#ifdef ASPECT_DEBUG
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#include <stdio.h>
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#endif
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float monitor_aspect=4.0/3.0;
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static struct {
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int orgw; // real width
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int orgh; // real height
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int prew; // prescaled width
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int preh; // prescaled height
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int scrw; // horizontal resolution
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int scrh; // vertical resolution
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} aspdat;
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void aspect_save_orig(int orgw, int orgh){
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aspdat.orgw = orgw;
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aspdat.orgh = orgh;
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}
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void aspect_save_prescale(int prew, int preh){
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aspdat.prew = prew;
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aspdat.preh = preh;
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}
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void aspect_save_screenres(int scrw, int scrh){
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aspdat.scrw = scrw;
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aspdat.scrh = scrh;
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}
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/* aspect is called with the source resolution and the
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* resolution, that the scaled image should fit into
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*/
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void aspect(int *srcw, int *srch, int zoom){
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int tmpw;
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#ifdef ASPECT_DEBUG
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printf("aspect(0) fitin: %dx%d zoom: %d \n",aspdat.scrw,aspdat.scrh,zoom);
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printf("aspect(1) wh: %dx%d (org: %dx%d)\n",*srcw,*srch,aspdat.prew,aspdat.preh);
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#endif
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if(zoom){
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*srcw = aspdat.scrw;
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*srch = (int)(((float)aspdat.scrw / (float)aspdat.prew * (float)aspdat.preh)
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* ((float)aspdat.scrh / ((float)aspdat.scrw / monitor_aspect)));
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}else{
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*srcw = aspdat.prew;
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*srch = (int)((float)aspdat.preh
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* ((float)aspdat.scrh / ((float)aspdat.scrw / monitor_aspect)));
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}
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*srch+= *srch%2; // round
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#ifdef ASPECT_DEBUG
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printf("aspect(2) wh: %dx%d (org: %dx%d)\n",*srcw,*srch,aspdat.prew,aspdat.preh);
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#endif
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if(*srch>aspdat.scrh || *srch<aspdat.orgh){
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if(zoom)
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tmpw = (int)(((float)aspdat.scrh / (float)aspdat.preh * (float)aspdat.prew)
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* ((float)aspdat.scrw / ((float)aspdat.scrh / (1.0/monitor_aspect))));
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else
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tmpw = (int)((float)aspdat.prew
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* ((float)aspdat.scrw / ((float)aspdat.scrh / (1.0/monitor_aspect))));
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if(tmpw<=aspdat.scrw && tmpw>=aspdat.orgw){
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*srch = zoom?aspdat.scrh:aspdat.preh;
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*srcw = tmpw;
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*srcw+= *srcw%2; // round
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}
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}
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#ifdef ASPECT_DEBUG
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printf("aspect(3) wh: %dx%d (org: %dx%d)\n",*srcw,*srch,aspdat.prew,aspdat.preh);
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#endif
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}
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