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rle: K&R formatting cosmetics

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This commit is contained in:
Vittorio Giovara 2016-06-26 20:08:56 -04:00
parent 326d911693
commit eeb6849ced
2 changed files with 25 additions and 18 deletions
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34
libavcodec/rle.c
View File

@ -18,26 +18,29 @@
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/common.h"
#include "avcodec.h"
#include "rle.h"
#include "libavutil/common.h"
int ff_rle_count_pixels(const uint8_t *start, int len, int bpp, int same)
{
const uint8_t *pos;
int count = 1;
for(pos = start + bpp; count < FFMIN(127, len); pos += bpp, count ++) {
if(same != !memcmp(pos-bpp, pos, bpp)) {
if(!same) {
/* if bpp == 1, then 0 1 1 0 is more efficiently encoded as a single
* raw block of pixels. for larger bpp, RLE is as good or better */
if(bpp == 1 && count + 1 < FFMIN(127, len) && *pos != *(pos+1))
for (pos = start + bpp; count < FFMIN(127, len); pos += bpp, count++) {
if (same != !memcmp(pos - bpp, pos, bpp)) {
if (!same) {
/* if bpp == 1, then 0 1 1 0 is more efficiently encoded as a
* single raw block of pixels. For larger bpp, RLE is as good
* or better */
if (bpp == 1 && count + 1 < FFMIN(127, len) && *pos != *(pos + 1))
continue;
/* if RLE can encode the next block better than as a raw block,
* back up and leave _all_ the identical pixels for RLE */
count --;
count--;
}
break;
}
@ -46,25 +49,28 @@ int ff_rle_count_pixels(const uint8_t *start, int len, int bpp, int same)
return count;
}
int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *ptr , int bpp, int w,
int add_rep, int xor_rep, int add_raw, int xor_raw)
int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *ptr, int bpp,
int w, int add_rep, int xor_rep, int add_raw, int xor_raw)
{
int count, x;
uint8_t *out = outbuf;
for(x = 0; x < w; x += count) {
for (x = 0; x < w; x += count) {
/* see if we can encode the next set of pixels with RLE */
if ((count = ff_rle_count_pixels(ptr, w - x, bpp, 1)) > 1) {
if(out + bpp + 1 > outbuf + out_size) return -1;
if (out + bpp + 1 > outbuf + out_size)
return -1;
*out++ = (count ^ xor_rep) + add_rep;
memcpy(out, ptr, bpp);
out += bpp;
} else {
/* fall back on uncompressed */
count = ff_rle_count_pixels(ptr, w - x, bpp, 0);
if(out + bpp*count >= outbuf + out_size) return -1;
*out++ = (count ^ xor_raw) + add_raw;
if (out + bpp * count >= outbuf + out_size)
return -1;
*out++ = (count ^ xor_raw) + add_raw;
memcpy(out, ptr, bpp * count);
out += bpp * count;
}

9
libavcodec/rle.h
View File

@ -35,8 +35,9 @@
int ff_rle_count_pixels(const uint8_t *start, int len, int bpp, int same);
/**
* RLE compress the row, with maximum size of out_size. Value before repeated bytes is (count ^ xor_rep) + add_rep.
* Value before raw bytes is (count ^ xor_raw) + add_raw.
* RLE compress the row, with maximum size of out_size.
* Value before repeated bytes is (count ^ xor_rep) + add_rep.
* Value before raw bytes is (count ^ xor_raw) + add_raw.
* @param outbuf Output buffer
* @param out_size Maximum output size
* @param inbuf Input buffer
@ -44,7 +45,7 @@ int ff_rle_count_pixels(const uint8_t *start, int len, int bpp, int same);
* @param w Image width
* @return Size of output in bytes, or -1 if larger than out_size
*/
int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *inbuf, int bpp, int w,
int add_rep, int xor_rep, int add_raw, int xor_raw);
int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *inbuf, int bpp,
int w, int add_rep, int xor_rep, int add_raw, int xor_raw);
#endif /* AVCODEC_RLE_H */