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avcodec/xbmenc: Avoid snprintf() for data->hex conversion
Use a small LUT instead. Improves performance. Reviewed-by: Marton Balint <cus@passwd.hu> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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@ -20,11 +20,9 @@
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/reverse.h"
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#include "avcodec.h"
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#include "codec_internal.h"
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#include "encode.h"
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#include "mathops.h"
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#define ANSI_MIN_READLINE 509
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@ -57,14 +55,25 @@ static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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buf += snprintf(buf, 39, "static unsigned char image_bits[] = {\n");
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for (i = 0, l = lineout; i < avctx->height; i++) {
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for (j = 0; j < linesize; j++) {
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buf += snprintf(buf, 6, " 0x%02X", ff_reverse[*ptr++]);
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// 0..15 bitreversed as chars
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static const char lut[] = {
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'0', '8', '4', 'C', '2', 'A', '6', 'E',
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'1', '9', '5', 'D', '3', 'B', '7', 'F'
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};
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buf[0] = ' ';
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buf[1] = '0';
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buf[2] = 'x';
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buf[3] = lut[*ptr & 0xF];
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buf[4] = lut[*ptr >> 4];
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buf += 5;
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ptr++;
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if (--commas <= 0) {
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buf += snprintf(buf, 2, "\n");
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*buf++ = '\n';
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break;
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}
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buf += snprintf(buf, 2, ",");
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*buf++ = ',';
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if (--l <= 0) {
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buf += snprintf(buf, 2, "\n");
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*buf++ = '\n';
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l = lineout;
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}
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}
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