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image: Add a --strip-alpha flag

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It can be used to look at an input image without its alpha channel.
This commit is contained in:
Nico Weber 2023-06-13 19:26:01 -04:00 • committed by Andreas Kling
parent d70ddc8961
commit ca35b5d767
1 changed files with 25 additions and 0 deletions
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25
Userland/Utilities/image.cpp
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@ -33,6 +33,9 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
bool ppm_ascii = false;
args_parser.add_option(ppm_ascii, "Convert to a PPM in ASCII", "ppm-ascii", {});
bool strip_alpha = false;
args_parser.add_option(strip_alpha, "Remove alpha channel", "strip-alpha", {});
StringView assign_color_profile_path;
args_parser.add_option(assign_color_profile_path, "Load color profile from file and assign it to output image", "assign-color-profile", {}, "FILE");
@ -57,6 +60,28 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
}
auto frame = TRY(decoder->frame(frame_index)).image;
if (strip_alpha) {
switch (frame->format()) {
case Gfx::BitmapFormat::Invalid:
case Gfx::BitmapFormat::Indexed1:
case Gfx::BitmapFormat::Indexed2:
case Gfx::BitmapFormat::Indexed4:
case Gfx::BitmapFormat::Indexed8:
warnln("Can't --strip-alpha with indexed or invalid bitmaps");
return 1;
case Gfx::BitmapFormat::RGBA8888:
// No image decoder currently produces bitmaps with this format.
// If that ever changes, preferrably fix the image decoder to use BGRA8888 instead :)
// If there's a good reason for not doing that, implement support for this, I suppose.
warnln("Can't --strip-alpha not implemented for RGBA8888");
return 1;
case Gfx::BitmapFormat::BGRA8888:
case Gfx::BitmapFormat::BGRx8888:
frame->strip_alpha_channel();
}
}
Optional<ReadonlyBytes> icc_data = TRY(decoder->icc_data());
RefPtr<Core::MappedFile> icc_file;