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Support rgbgfx -c auto for automatic palette generation

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This commit is contained in:
Rangi42
2025-08-05 13:05:21 -04:00
parent 7020cf7188
commit 98c5c7f776
2 changed files with 15 additions and 1 deletions
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10
man/rgbgfx.1
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@@ -180,6 +180,16 @@ and so on.
Gray shade 0 is the lightest (white), 3 is the darkest (black). Gray shade 0 is the lightest (white), 3 is the darkest (black).
The same gray shade cannot go in two color indexes. The same gray shade cannot go in two color indexes.
To specify a DMG palette, the input PNG must have all its colors in shades of gray, without any transparent colors. To specify a DMG palette, the input PNG must have all its colors in shades of gray, without any transparent colors.
.It Sy automatic palette generation
If
.Ar pal_spec
is the case-insensitive word
.Cm auto ,
then a palette is automatically generated using the procedure described in
.Sx PALETTE GENERATION .
This is the default behavior if
.Fl c
was not specified.
.It Sy external palette spec .It Sy external palette spec
Otherwise, Otherwise,
.Ar pal_spec .Ar pal_spec

6
src/gfx/main.cpp
View File

@@ -343,6 +343,8 @@ static char *parseArgv(int argc, char *argv[]) {
} else if (strcasecmp(musl_optarg, "embedded") == 0) { } else if (strcasecmp(musl_optarg, "embedded") == 0) {
// Use PLTE, error out if missing // Use PLTE, error out if missing
options.palSpecType = Options::EMBEDDED; options.palSpecType = Options::EMBEDDED;
} else if (strcasecmp(musl_optarg, "auto") == 0) {
options.palSpecType = Options::NO_SPEC;
} else if (strncasecmp(musl_optarg, "dmg=", literal_strlen("dmg=")) == 0) { } else if (strncasecmp(musl_optarg, "dmg=", literal_strlen("dmg=")) == 0) {
options.palSpecType = Options::DMG; options.palSpecType = Options::DMG;
parseDmgPalSpec(&musl_optarg[literal_strlen("dmg=")]); parseDmgPalSpec(&musl_optarg[literal_strlen("dmg=")]);
@@ -634,7 +636,9 @@ static void verboseOutputConfig() {
// -s/--palette-size // -s/--palette-size
fprintf(stderr, "\tPalettes contain %" PRIu8 " colors\n", options.nbColorsPerPal); fprintf(stderr, "\tPalettes contain %" PRIu8 " colors\n", options.nbColorsPerPal);
// -c/--colors // -c/--colors
if (options.palSpecType != Options::NO_SPEC) { if (options.palSpecType == Options::NO_SPEC) {
fputs("\tAutomatic palette generation\n", stderr);
} else {
fprintf(stderr, "\t%s palette spec\n", [] { fprintf(stderr, "\t%s palette spec\n", [] {
switch (options.palSpecType) { switch (options.palSpecType) {
case Options::EXPLICIT: case Options::EXPLICIT: