weston/wcap/wcap-decode.c

165 lines
3.9 KiB
C

/*
* Copyright © 2012 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <sys/mman.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <cairo.h>
#include "wcap-decode.h"
static void
wcap_decoder_decode_rectangle(struct wcap_decoder *decoder,
struct wcap_rectangle *rect)
{
uint32_t v, *p = decoder->p, *d;
int width = rect->x2 - rect->x1, height = rect->y2 - rect->y1;
int x, i, j, k, l, count = width * height;
unsigned char r, g, b, dr, dg, db;
d = decoder->frame + (rect->y2 - 1) * decoder->width;
x = rect->x1;
i = 0;
while (i < count) {
v = *p++;
l = v >> 24;
if (l < 0xe0) {
j = l + 1;
} else {
j = 1 << (l - 0xe0 + 7);
}
dr = (v >> 16);
dg = (v >> 8);
db = (v >> 0);
for (k = 0; k < j; k++) {
r = (d[x] >> 16) + dr;
g = (d[x] >> 8) + dg;
b = (d[x] >> 0) + db;
d[x] = 0xff000000 | (r << 16) | (g << 8) | b;
x++;
if (x == rect->x2) {
x = rect->x1;
d -= decoder->width;
}
}
i += j;
}
if (i != count)
printf("rle encoding longer than expected (%d expected %d)\n",
i, count);
decoder->p = p;
}
int
wcap_decoder_get_frame(struct wcap_decoder *decoder)
{
struct wcap_rectangle *rects;
struct wcap_frame_header *header;
uint32_t i;
if (decoder->p == decoder->end)
return 0;
header = decoder->p;
decoder->msecs = header->msecs;
decoder->count++;
rects = (void *) (header + 1);
decoder->p = (uint32_t *) (rects + header->nrects);
for (i = 0; i < header->nrects; i++)
wcap_decoder_decode_rectangle(decoder, &rects[i]);
return 1;
}
struct wcap_decoder *
wcap_decoder_create(const char *filename)
{
struct wcap_decoder *decoder;
struct wcap_header *header;
int frame_size;
struct stat buf;
decoder = malloc(sizeof *decoder);
if (decoder == NULL)
return NULL;
decoder->fd = open(filename, O_RDONLY);
if (decoder->fd == -1) {
free(decoder);
return NULL;
}
fstat(decoder->fd, &buf);
decoder->size = buf.st_size;
decoder->map = mmap(NULL, decoder->size,
PROT_READ, MAP_PRIVATE, decoder->fd, 0);
if (decoder->map == MAP_FAILED) {
fprintf(stderr, "mmap failed\n");
free(decoder);
return NULL;
}
header = decoder->map;
decoder->format = header->format;
decoder->count = 0;
decoder->width = header->width;
decoder->height = header->height;
decoder->p = header + 1;
decoder->end = decoder->map + decoder->size;
frame_size = header->width * header->height * 4;
decoder->frame = malloc(frame_size);
if (decoder->frame == NULL) {
free(decoder);
return NULL;
}
memset(decoder->frame, 0, frame_size);
return decoder;
}
void
wcap_decoder_destroy(struct wcap_decoder *decoder)
{
munmap(decoder->map, decoder->size);
close(decoder->fd);
free(decoder->frame);
free(decoder);
}