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mpv/TOOLS/vf_dlopen/rectangle.c

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/*
* Copyright (c) 2012 Rudolf Polzer <divVerent@xonotic.org>
*
* This file is part of mpv's vf_dlopen examples.
*
* mpv's vf_dlopen examples are free software; you can redistribute them and/or
* modify them 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's vf_dlopen examples are distributed in the hope that they 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's vf_dlopen examples; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include "vf_dlopen.h"
#include "filterutils.h"
/*
* rectangle
*
* usage: --vf=dlopen=/path/to/rectangle.so
*
* provides an editable rectangle
* NOTE: unix only, and requires xterm to be installed. Don't ask.
*/
typedef struct
{
int x, y, w, h;
int step;
int inpid;
int infd;
int ansimode;
int rectmode;
} privdata;
enum {
RECTMODE_LINES = 0,
RECTMODE_BOX,
RECTMODE_COUNT
};
static int put_image(struct vf_dlopen_context *ctx)
{
privdata *priv = ctx->priv;
unsigned int p;
assert(ctx->inpic.planes == ctx->outpic->planes);
for (p = 0; p < ctx->outpic->planes; ++p) {
assert(ctx->inpic.planewidth[p] == ctx->outpic->planewidth[p]);
assert(ctx->inpic.planeheight[p] == ctx->outpic->planeheight[p]);
}
char data;
while(read(priv->infd, &data, sizeof(data)) > 0) {
// printf("\nMODE: %d, CHAR: %d (%c)\n", priv->ansimode, data, data);
switch(priv->ansimode) {
case 0: // initial
switch(data) {
case 27: priv->ansimode = 1; break;
default: priv->ansimode = 0; break;
}
break;
case 1: // seen ESC
switch(data) {
case '[': priv->ansimode = 2; break;
default: priv->ansimode = 0; break;
}
break;
case 2: // seen ESC [
switch(data) {
case 'D': priv->ansimode = 0; data = 'h'; break; // arrow
case 'B': priv->ansimode = 0; data = 'j'; break; // arrow
case 'A': priv->ansimode = 0; data = 'k'; break; // arrow
case 'C': priv->ansimode = 0; data = 'l'; break; // arrow
case 'd': priv->ansimode = 0; data = 'H'; break; // rxvt shift-arrow
case 'b': priv->ansimode = 0; data = 'J'; break; // rxvt shift-arrow
case 'a': priv->ansimode = 0; data = 'K'; break; // rxvt shift-arrow
case 'c': priv->ansimode = 0; data = 'L'; break; // rxvt shift-arrow
case '1': priv->ansimode = 3; break;
default: priv->ansimode = -1; break;
}
break;
case 3: // seen ESC [ 1
switch(data) {
case ';': priv->ansimode = 4; break;
default: priv->ansimode = -1; break;
}
break;
case 4: // seen ESC [ 1 ;
switch(data) {
case '2': priv->ansimode = 5; break;
default: priv->ansimode = -1; break;
}
break;
case 5: // seen ESC [ 1 ; 2
switch(data) {
case 'D': priv->ansimode = 0; data = 'H'; break; // xterm shift-arrow
case 'B': priv->ansimode = 0; data = 'J'; break; // xterm shift-arrow
case 'A': priv->ansimode = 0; data = 'K'; break; // xterm shift-arrow
case 'C': priv->ansimode = 0; data = 'L'; break; // xterm shift-arrow
default: priv->ansimode = -1; break;
}
break;
case -1: // wait for end of ESC [ sequence
if((data > '9' || data < '0') && (data != ';')) {
priv->ansimode = 0;
data = 0; // do not process
}
break;
}
if(priv->ansimode == 0) {
switch(data) {
case 'h': case 'D': priv->x -= priv->step; priv->w += priv->step; break;
case 'j': case 'B': priv->y += priv->step; priv->h -= priv->step; break;
case 'k': case 'A': priv->y -= priv->step; priv->h += priv->step; break;
case 'l': case 'C': priv->x += priv->step; priv->w -= priv->step; break;
case 'H': case 'd': priv->w -= priv->step; break;
case 'J': case 'b': priv->h += priv->step; break;
case 'K': case 'a': priv->h -= priv->step; break;
case 'L': case 'c': priv->w += priv->step; break;
case ' ': priv->step ^= 9; break;
case 9: ++priv->rectmode; priv->rectmode %= RECTMODE_COUNT; break;
}
}
}
// apply limits
if(priv->x < 0) {
priv->w += priv->x;
priv->x = 0;
}
if(priv->y < 0) {
priv->h += priv->y;
priv->y = 0;
}
if(priv->w < 0) {
priv->w = 0;
}
if(priv->h < 0) {
priv->h = 0;
}
if(priv->x >= (int) ctx->inpic.planewidth[0]) {
priv->x = ctx->inpic.planewidth[0] - 1;
}
if(priv->y >= (int) ctx->inpic.planeheight[0]) {
priv->y = ctx->inpic.planeheight[0] - 1;
}
if(priv->x + priv->w > (int) ctx->inpic.planewidth[0]) {
priv->w = ctx->inpic.planewidth[0] - priv->x;
}
if(priv->y + priv->h > (int) ctx->inpic.planeheight[0]) {
priv->h = ctx->inpic.planeheight[0] - priv->y;
}
// apply step
priv->x = ((priv->x + priv->step - 1) / priv->step) * priv->step;
priv->y = ((priv->y + priv->step - 1) / priv->step) * priv->step;
priv->w = (priv->w / priv->step) * priv->step;
priv->h = (priv->h / priv->step) * priv->step;
// print
printf("\nRECTANGLE: -vf crop=%d:%d:%d:%d\n", priv->w, priv->h, priv->x, priv->y);
// copy picture
for (p = 0; p < ctx->outpic->planes; ++p) {
copy_plane(
ctx->outpic->plane[p], ctx->outpic->planestride[p],
ctx->inpic.plane[p], ctx->inpic.planestride[p],
ctx->inpic.planewidth[p], ctx->inpic.planeheight[p]
);
}
ctx->outpic->pts = ctx->inpic.pts;
// draw rectangle
#define PUT_PIXEL(x,y) \
do { \
int x_ = (x); \
int y_ = (y); \
if(x_ >= 0 && y_ >= 0 && x_ < (int) ctx->outpic->planewidth[0] && y_ < (int) ctx->outpic->planeheight[0]) { \
ctx->outpic->plane[0][y_ * ctx->outpic->planestride[0] + x_] ^= 0x80; \
} \
} while(0)
switch(priv->rectmode) {
case RECTMODE_LINES:
{
unsigned int i;
unsigned int n;
if(priv->w > priv->h)
n = priv->h / 3;
else
n = priv->w / 3;
if(n > 64)
n = 64;
for (i = 0; i < n; ++i) {
// topleft
PUT_PIXEL(priv->x + i, priv->y);
if(i)
PUT_PIXEL(priv->x, priv->y + i);
// topright
PUT_PIXEL(priv->x + priv->w - 1 - i, priv->y);
if(i)
PUT_PIXEL(priv->x + priv->w - 1, priv->y + i);
// bottomright
PUT_PIXEL(priv->x + priv->w - 1 - i, priv->y + priv->h - 1);
if(i)
PUT_PIXEL(priv->x + priv->w - 1, priv->y + priv->h - 1 - i);
// bottomleft
PUT_PIXEL(priv->x + i, priv->y + priv->h - 1);
if(i)
PUT_PIXEL(priv->x, priv->y + priv->h - 1 - i);
}
}
break;
case RECTMODE_BOX:
{
int x, y;
for(y = 0; y < priv->y; ++y) {
for(x = 0; x < (int) ctx->outpic->planewidth[0]; ++x) {
PUT_PIXEL(x, y);
}
}
for(y = priv->y; y < priv->y + priv->h; ++y) {
for(x = 0; x < priv->x; ++x) {
PUT_PIXEL(x, y);
}
for(x = priv->x + priv->w; x < (int) ctx->outpic->planewidth[0]; ++x) {
PUT_PIXEL(x, y);
}
}
for(y = priv->y + priv->h; y < (int) ctx->outpic->planeheight[0]; ++y) {
for(x = 0; x < (int) ctx->outpic->planewidth[0]; ++x) {
PUT_PIXEL(x, y);
}
}
}
break;
}
return 1;
}
int config(struct vf_dlopen_context *ctx)
{
privdata *priv = ctx->priv;
if(priv->w == 0 || priv->h == 0) {
priv->x = 0;
priv->y = 0;
priv->w = ctx->in_width;
priv->h = ctx->in_height;
}
printf("\nRECTANGLE: reconfigured\n");
if(priv->inpid == 0) {
int fd[2];
if(pipe(fd)) {
perror("pipe");
return -1;
}
priv->inpid = fork();
if(priv->inpid < 0) {
perror("fork");
return -1;
}
if(priv->inpid == 0) {
close(fd[0]);
if(fd[1] != 3) {
dup2(fd[1], 3);
close(fd[1]);
}
execlp("xterm", "xterm",
"-geometry", "40x10",
"-e",
"echo \"rectangle.so control window\";"
"echo \"\";"
"echo \"Arrow or hjkl: top left corner\";"
"echo \"Shift-Arrow or HJKL: bottom right corner\";"
"echo \"SPACE: toggle 8-px alignment\";"
"echo \"TAB: toggle rectangle display\";"
"echo \"\";"
"stty raw -echo;"
"cat >&3",
NULL
);
_exit(1);
}
close(fd[1]);
priv->infd = fd[0];
int flags;
if(fcntl(priv->infd, F_GETFL, &flags)) {
perror("fcntl F_GETFL");
close(priv->infd);
kill(priv->inpid, SIGTERM);
waitpid(priv->inpid, NULL, 0);
priv->inpid = 0;
}
flags |= O_NONBLOCK;
if(fcntl(priv->infd, F_SETFL, flags)) {
perror("fcntl F_SETFL");
close(priv->infd);
kill(priv->inpid, SIGTERM);
waitpid(priv->inpid, NULL, 0);
priv->inpid = 0;
}
}
return 1;
}
void uninit(struct vf_dlopen_context *ctx)
{
privdata *priv = ctx->priv;
if(priv->inpid) {
close(priv->infd);
kill(priv->inpid, SIGTERM);
waitpid(priv->inpid, NULL, 0);
priv->inpid = 0;
}
printf("\nRECTANGLE: finished\n");
free(priv);
}
int vf_dlopen_getcontext(struct vf_dlopen_context *ctx, int argc, const char **argv)
{
VF_DLOPEN_CHECK_VERSION(ctx);
(void) argc;
(void) argv;
static struct vf_dlopen_formatpair map[] = {
{ "yuv420p", "yuv420p" },
{ NULL, NULL }
};
privdata *priv = malloc(sizeof(privdata));
memset(priv, 0, sizeof(*priv));
priv->step = 8;
if(argc >= 1)
priv->w = atoi(argv[0]);
if(argc >= 2)
priv->h = atoi(argv[1]);
if(argc >= 3)
priv->x = atoi(argv[2]);
if(argc >= 4)
priv->y = atoi(argv[3]);
ctx->priv = priv;
ctx->format_mapping = map;
ctx->config = config;
ctx->put_image = put_image;
ctx->uninit = uninit;
return 1;
}
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