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Introduce a 'fast' alpha mode

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.. where only 2 filtering modes are potentially
tried, instead of all of them. This is fast than the exhaustive 'best'
mode, and not much worse.

Options for cwebp are:
 -alpha_filter none
 -alpha_filter fast      (<- default)
 -alpha_filter best      (<- slow)

Change-Id: I8cb90ee11b8f981811e013ea4ad5bf72ba3ea7d4
This commit is contained in:
Pascal Massimino
2012-01-08 19:27:21 -08:00
parent ad1e163a0d
commit 8ca2076de1
9 changed files with 179 additions and 153 deletions
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15
examples/cwebp.c
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@ -700,7 +700,8 @@ static void HelpLong(void) {
printf(" -map <int> ............. print map of extra info.\n");
printf(" -d <file.pgm> .......... dump the compressed output (PGM file).\n");
printf(" -alpha_method <int> .... Transparency-compression method (0..1)\n");
printf(" -alpha_filter <int> .... predictive filtering for Alpha (0..5)\n");
printf(" -alpha_filter <string> . predictive filtering for alpha plane.\n");
printf(" One of: none, fast (default) or best.\n");
printf(" -noalpha ............... discard any transparency information.\n");
printf("\n");
@ -795,7 +796,17 @@ int main(int argc, const char *argv[]) {
} else if (!strcmp(argv[c], "-alpha_method") && c < argc - 1) {
config.alpha_compression = strtol(argv[++c], NULL, 0);
} else if (!strcmp(argv[c], "-alpha_filter") && c < argc - 1) {
config.alpha_filtering = strtol(argv[++c], NULL, 0);
++c;
if (!strcmp(argv[c], "none")) {
config.alpha_filtering = 0;
} else if (!strcmp(argv[c], "fast")) {
config.alpha_filtering = 1;
} else if (!strcmp(argv[c], "best")) {
config.alpha_filtering = 2;
} else {
fprintf(stderr, "Error! Unrecognized alpha filter: %s\n", argv[c]);
goto Error;
}
} else if (!strcmp(argv[c], "-noalpha")) {
keep_alpha = 0;
} else if (!strcmp(argv[c], "-size") && c < argc - 1) {