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img2webp: add -exact/-noexact per-frame options

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Bug: b:363409354
Change-Id: I4e7282ed2df091dbef6d79743be1c8c868c0d44a
This commit is contained in:
James Zern 2024-09-03 18:58:13 -07:00
parent 1c8eba978b
commit 57883c78ed
3 changed files with 17 additions and 1 deletions
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3
doc/tools.md
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@ -325,6 +325,9 @@ Per-frame options (only used for subsequent images input):
-lossy ............... use lossy mode
-q <float> ........... quality
-m <int> ............. method to use
-exact, -noexact ..... preserve or alter RGB values in transparent area
(default: -noexact, may cause artifacts
with lossy animations)
```
example: `img2webp -loop 2 in0.png -lossy in1.jpg -d 80 in2.tiff -o out.webp`

8
examples/img2webp.c
View File

@ -63,6 +63,10 @@ static void Help(void) {
printf(" -lossy ............... use lossy mode\n");
printf(" -q <float> ........... quality\n");
printf(" -m <int> ............. method to use\n");
printf(" -exact, -noexact ..... preserve or alter RGB values in transparent "
"area\n"
" (default: -noexact, may cause artifacts\n"
" with lossy animations)\n");
printf("\n");
printf("example: img2webp -loop 2 in0.png -lossy in1.jpg\n"
@ -248,6 +252,10 @@ int main(int argc, const char* argv[]) {
fprintf(stderr, "Invalid negative duration (%d)\n", duration);
parse_error = 1;
}
} else if (!strcmp(argv[c], "-exact")) {
config.exact = 1;
} else if (!strcmp(argv[c], "-noexact")) {
config.exact = 0;
} else {
parse_error = 1; // shouldn't be here.
fprintf(stderr, "Unknown option [%s]\n", argv[c]);

7
man/img2webp.1
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@ -1,5 +1,5 @@
.\" Hey, EMACS: -*- nroff -*-
.TH IMG2WEBP 1 "July 18, 2024"
.TH IMG2WEBP 1 "September 3, 2024"
.SH NAME
img2webp \- create animated WebP file from a sequence of input images.
.SH SYNOPSIS
@ -88,6 +88,11 @@ Specify the compression factor between 0 and 100. The default is 75.
Specify the compression method to use. This parameter controls the
trade off between encoding speed and the compressed file size and quality.
Possible values range from 0 to 6. Default value is 4.
.TP
.B \-exact, \-noexact
Preserve or alter RGB values in transparent area. The default is
\fB-noexact\fP, to help compressibility. Note \fB\-noexact\fP may cause
artifacts in frames compressed with \fB\-lossy\fP.
.SH EXIT STATUS
If there were no problems during execution, \fBimg2webp\fP exits with the value