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/*
* Copyright © 2012 Intel Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of the copyright holders not be used in
* advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. The copyright holders make
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#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 *s;
uint32_t i;
int width, height;
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++) {
width = rects[i].x2 - rects[i].x1;
height = rects[i].y2 - rects[i].y1;
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);
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);
memset(decoder->frame, 0, frame_size);
return decoder;
}
void
wcap_decoder_destroy(struct wcap_decoder *decoder)
{
munmap(decoder->map, decoder->size);
free(decoder->frame);
free(decoder);
}
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