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Make discarding invisible RGB values (cleanup alpha) the default.

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Rename the flag to exact instead of the opposite cleanup_alpha. Add the flag to
WebPConfig. Do the cleanup in the webp encoder library rather than the cwebp
binary, this will be needed for the next stage: smarter alpha cleanup for
better compression which cannot be done as a preprocessing due to depending on
predictor choices in the encoder.

Change-Id: I2fbf57f918a35f2da6186ef0b5d85e5fd0020eef
This commit is contained in:
Lode Vandevenne
2015-11-16 13:14:57 +00:00
committed by James Zern
parent b37b0179c5
commit 1f9be97c22
6 changed files with 24 additions and 13 deletions
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12
examples/cwebp.c
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@ -611,7 +611,8 @@ static void HelpLong(void) {
printf(" -alpha_method <int> .... transparency-compression method (0..1)\n");
printf(" -alpha_filter <string> . predictive filtering for alpha plane,\n");
printf(" one of: none, fast (default) or best\n");
printf(" -alpha_cleanup ......... clean RGB values in transparent area\n");
printf(" -exact ................. preserve RGB values in transparent area"
"\n");
printf(" -blend_alpha <hex> ..... blend colors against background color\n"
" expressed as RGB values written in\n"
" hexadecimal, e.g. 0xc0e0d0 for red=0xc0\n"
@ -763,7 +764,10 @@ int main(int argc, const char *argv[]) {
} else if (!strcmp(argv[c], "-alpha_method") && c < argc - 1) {
config.alpha_compression = ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-alpha_cleanup")) {
keep_alpha = keep_alpha ? 2 : 0;
// This flag is obsolete, does opposite of -exact.
config.exact = 0;
} else if (!strcmp(argv[c], "-exact")) {
config.exact = 1;
} else if (!strcmp(argv[c], "-blend_alpha") && c < argc - 1) {
blend_alpha = 1;
// background color is given in hex with an optional '0x' prefix
@ -996,10 +1000,6 @@ int main(int argc, const char *argv[]) {
WebPBlendAlpha(&picture, background_color);
}
if (keep_alpha == 2) {
WebPCleanupTransparentArea(&picture);
}
if (verbose) {
const double read_time = StopwatchReadAndReset(&stop_watch);
fprintf(stderr, "Time to read input: %.3fs\n", read_time);