mpv/video/out/bitmap_packer.c

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/*
* Calculate how to pack bitmap rectangles into a larger surface
*
* Copyright 2009, 2012 Uoti Urpala
*
* This file is part of mpv.
*
Relicense some non-MPlayer source files to LGPL 2.1 or later This covers source files which were added in mplayer2 and mpv times only, and where all code is covered by LGPL relicensing agreements. There are probably more files to which this applies, but I'm being conservative here. A file named ao_sdl.c exists in MPlayer too, but the mpv one is a complete rewrite, and was added some time after the original ao_sdl.c was removed. The same applies to vo_sdl.c, for which the SDL2 API is radically different in addition (MPlayer supports SDL 1.2 only). common.c contains only code written by me. But common.h is a strange case: although it originally was named mp_common.h and exists in MPlayer too, by now it contains only definitions written by uau and me. The exceptions are the CONTROL_ defines - thus not changing the license of common.h yet. codec_tags.c contained once large tables generated from MPlayer's codecs.conf, but all of these tables were removed. From demux_playlist.c I'm removing a code fragment from someone who was not asked; this probably could be done later (see commit 15dccc37). misc.c is a bit complicated to reason about (it was split off mplayer.c and thus contains random functions out of this file), but actually all functions have been added post-MPlayer. Except get_relative_time(), which was written by uau, but looks similar to 3 different versions of something similar in each of the Unix/win32/OSX timer source files. I'm not sure what that means in regards to copyright, so I've just moved it into another still-GPL source file for now. screenshot.c once had some minor parts of MPlayer's vf_screenshot.c, but they're all gone.
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* 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
Relicense some non-MPlayer source files to LGPL 2.1 or later This covers source files which were added in mplayer2 and mpv times only, and where all code is covered by LGPL relicensing agreements. There are probably more files to which this applies, but I'm being conservative here. A file named ao_sdl.c exists in MPlayer too, but the mpv one is a complete rewrite, and was added some time after the original ao_sdl.c was removed. The same applies to vo_sdl.c, for which the SDL2 API is radically different in addition (MPlayer supports SDL 1.2 only). common.c contains only code written by me. But common.h is a strange case: although it originally was named mp_common.h and exists in MPlayer too, by now it contains only definitions written by uau and me. The exceptions are the CONTROL_ defines - thus not changing the license of common.h yet. codec_tags.c contained once large tables generated from MPlayer's codecs.conf, but all of these tables were removed. From demux_playlist.c I'm removing a code fragment from someone who was not asked; this probably could be done later (see commit 15dccc37). misc.c is a bit complicated to reason about (it was split off mplayer.c and thus contains random functions out of this file), but actually all functions have been added post-MPlayer. Except get_relative_time(), which was written by uau, but looks similar to 3 different versions of something similar in each of the Unix/win32/OSX timer source files. I'm not sure what that means in regards to copyright, so I've just moved it into another still-GPL source file for now. screenshot.c once had some minor parts of MPlayer's vf_screenshot.c, but they're all gone.
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* GNU Lesser General Public License for more details.
*
Relicense some non-MPlayer source files to LGPL 2.1 or later This covers source files which were added in mplayer2 and mpv times only, and where all code is covered by LGPL relicensing agreements. There are probably more files to which this applies, but I'm being conservative here. A file named ao_sdl.c exists in MPlayer too, but the mpv one is a complete rewrite, and was added some time after the original ao_sdl.c was removed. The same applies to vo_sdl.c, for which the SDL2 API is radically different in addition (MPlayer supports SDL 1.2 only). common.c contains only code written by me. But common.h is a strange case: although it originally was named mp_common.h and exists in MPlayer too, by now it contains only definitions written by uau and me. The exceptions are the CONTROL_ defines - thus not changing the license of common.h yet. codec_tags.c contained once large tables generated from MPlayer's codecs.conf, but all of these tables were removed. From demux_playlist.c I'm removing a code fragment from someone who was not asked; this probably could be done later (see commit 15dccc37). misc.c is a bit complicated to reason about (it was split off mplayer.c and thus contains random functions out of this file), but actually all functions have been added post-MPlayer. Except get_relative_time(), which was written by uau, but looks similar to 3 different versions of something similar in each of the Unix/win32/OSX timer source files. I'm not sure what that means in regards to copyright, so I've just moved it into another still-GPL source file for now. screenshot.c once had some minor parts of MPlayer's vf_screenshot.c, but they're all gone.
2016-01-19 17:36:06 +00:00
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
#include <limits.h>
#include "mpv_talloc.h"
#include "bitmap_packer.h"
#include "common/common.h"
#define IS_POWER_OF_2(x) (((x) > 0) && !(((x) - 1) & (x)))
void packer_reset(struct bitmap_packer *packer)
{
struct bitmap_packer old = *packer;
*packer = (struct bitmap_packer) {
.w_max = old.w_max,
.h_max = old.h_max,
};
talloc_free_children(packer);
}
void packer_get_bb(struct bitmap_packer *packer, struct pos out_bb[2])
{
out_bb[0] = (struct pos) {0};
out_bb[1] = (struct pos) {packer->used_width, packer->used_height};
}
#define HEIGHT_SORT_BITS 4
static int size_index(int s)
{
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int n = mp_log2(s);
return (n << HEIGHT_SORT_BITS)
+ ((- 1 - (s << HEIGHT_SORT_BITS >> n)) & ((1 << HEIGHT_SORT_BITS) - 1));
}
/* Pack the given rectangles into an area of size w * h.
* The size of each rectangle is read from in[i].x / in[i].y.
* The height of each rectangle must be less than 65536.
* 'scratch' must point to work memory for num_rects+16 ints.
* The packed position for rectangle number i is set in out[i].
* Return 0 on success, -1 if the rectangles did not fit in w*h.
*
* The rectangles are placed in rows in order approximately sorted by
* height (the approximate sorting is simpler than a full one would be,
* and allows the algorithm to work in linear time). Additionally, to
* reduce wasted space when there are a few tall rectangles, empty
* lower-right parts of rows are filled recursively when the size of
* rectangles in the row drops past a power-of-two threshold. So if a
* row starts with rectangles of size 3x50, 10x40 and 5x20 then the
* free rectangle with corners (13, 20)-(w, 50) is filled recursively.
*/
static int pack_rectangles(struct pos *in, struct pos *out, int num_rects,
int w, int h, int *scratch, int *used_width)
{
int bins[16 << HEIGHT_SORT_BITS];
int sizes[16 << HEIGHT_SORT_BITS] = { 0 };
for (int i = 0; i < num_rects; i++)
sizes[size_index(in[i].y)]++;
int idx = 0;
for (int i = 0; i < 16 << HEIGHT_SORT_BITS; i += 1 << HEIGHT_SORT_BITS) {
for (int j = 0; j < 1 << HEIGHT_SORT_BITS; j++) {
bins[i + j] = idx;
idx += sizes[i + j];
}
scratch[idx++] = -1;
}
for (int i = 0; i < num_rects; i++)
scratch[bins[size_index(in[i].y)]++] = i;
for (int i = 0; i < 16; i++)
bins[i] = bins[i << HEIGHT_SORT_BITS] - sizes[i << HEIGHT_SORT_BITS];
struct {
int size, x, bottom;
} stack[16] = {{15, 0, h}}, s = {0};
int stackpos = 1;
int y;
while (stackpos) {
y = s.bottom;
s = stack[--stackpos];
s.size++;
while (s.size--) {
int maxy = -1;
int obj;
while ((obj = scratch[bins[s.size]]) >= 0) {
int bottom = y + in[obj].y;
if (bottom > s.bottom)
break;
int right = s.x + in[obj].x;
if (right > w)
break;
bins[s.size]++;
out[obj] = (struct pos){s.x, y};
num_rects--;
if (maxy < 0)
stack[stackpos++] = s;
s.x = right;
maxy = MPMAX(maxy, bottom);
}
*used_width = MPMAX(*used_width, s.x);
if (maxy > 0)
s.bottom = maxy;
}
}
return num_rects ? -1 : y;
}
int packer_pack(struct bitmap_packer *packer)
{
if (packer->count == 0)
return 0;
int w_orig = packer->w, h_orig = packer->h;
struct pos *in = packer->in;
int xmax = 0, ymax = 0;
for (int i = 0; i < packer->count; i++) {
if (in[i].x <= 0 || in[i].y <= 0) {
in[i] = (struct pos){0, 0};
} else {
in[i].x += packer->padding * 2;
in[i].y += packer->padding * 2;
}
if (in[i].x < 0 || in [i].x > 65535 || in[i].y < 0 || in[i].y > 65535) {
fprintf(stderr, "Invalid OSD / subtitle bitmap size\n");
abort();
}
xmax = MPMAX(xmax, in[i].x);
ymax = MPMAX(ymax, in[i].y);
}
if (xmax > packer->w)
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packer->w = 1 << (mp_log2(xmax - 1) + 1);
if (ymax > packer->h)
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packer->h = 1 << (mp_log2(ymax - 1) + 1);
while (1) {
int used_width = 0;
int y = pack_rectangles(in, packer->result, packer->count,
packer->w, packer->h,
packer->scratch, &used_width);
if (y >= 0) {
packer->used_width = MPMIN(used_width, packer->w);
packer->used_height = MPMIN(y, packer->h);
assert(packer->w == 0 || IS_POWER_OF_2(packer->w));
assert(packer->h == 0 || IS_POWER_OF_2(packer->h));
if (packer->padding) {
for (int i = 0; i < packer->count; i++) {
packer->result[i].x += packer->padding;
packer->result[i].y += packer->padding;
}
}
return packer->w != w_orig || packer->h != h_orig;
}
int w_max = packer->w_max > 0 ? packer->w_max : INT_MAX;
int h_max = packer->h_max > 0 ? packer->h_max : INT_MAX;
if (packer->w <= packer->h && packer->w != w_max)
packer->w = MPMIN(packer->w * 2, w_max);
else if (packer->h != h_max)
packer->h = MPMIN(packer->h * 2, h_max);
else {
packer->w = w_orig;
packer->h = h_orig;
return -1;
}
}
}
void packer_set_size(struct bitmap_packer *packer, int size)
{
packer->count = size;
if (size <= packer->asize)
return;
packer->asize = MPMAX(packer->asize * 2, size);
talloc_free(packer->result);
talloc_free(packer->scratch);
packer->in = talloc_realloc(packer, packer->in, struct pos, packer->asize);
packer->result = talloc_array_ptrtype(packer, packer->result,
packer->asize);
packer->scratch = talloc_array_ptrtype(packer, packer->scratch,
packer->asize + 16);
}