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LibGFX/PAM: Allow reading CMYK .pam files

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These are written by `mutool extract` for CMYK images.

They don't contain color profiles so they're not super convenient.
But `image` can convert them (*) to sRGB as long as you use it with
`--assign-color-profile` pointing to some CMYK icc profile of your
choice.

*: Once #22922 is merged.
This commit is contained in:
Nico Weber 2024-01-24 21:51:22 -05:00 • committed by Andreas Kling
parent 187862ebe0
commit 556addc5cb
3 changed files with 70 additions and 18 deletions
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47
Userland/Libraries/LibGfx/ImageFormats/PAMLoader.cpp
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@ -19,30 +19,41 @@ ErrorOr<void> read_image_data(PAMLoadingContext& context)
bool is_rgb = context.format_details.depth == 3 && context.format_details.tupl_type == "RGB"sv;
bool is_rgba = context.format_details.depth == 4 && context.format_details.tupl_type == "RGB_ALPHA"sv;
if (!is_gray && !is_gray_alpha && !is_rgb && !is_rgba)
return Error::from_string_view("Unsupported PAM depth"sv);
bool is_cmyk = context.format_details.depth == 4 && context.format_details.tupl_type == "CMYK"sv;
TRY(create_bitmap(context));
if (!is_gray && !is_gray_alpha && !is_rgb && !is_rgba && !is_cmyk)
return Error::from_string_view("Unsupported PAM depth"sv);
auto& stream = *context.stream;
for (u64 i = 0; i < context.width * context.height; ++i) {
if (is_gray) {
Array<u8, 1> pixel;
TRY(stream.read_until_filled(pixel));
context.bitmap->set_pixel(i % context.width, i / context.width, { pixel[0], pixel[0], pixel[0] });
} else if (is_gray_alpha) {
Array<u8, 2> pixel;
TRY(stream.read_until_filled(pixel));
context.bitmap->set_pixel(i % context.width, i / context.width, { pixel[0], pixel[0], pixel[0], pixel[1] });
} else if (is_rgb) {
Array<u8, 3> pixel;
TRY(stream.read_until_filled(pixel));
context.bitmap->set_pixel(i % context.width, i / context.width, { pixel[0], pixel[1], pixel[2] });
} else if (is_rgba) {
if (is_cmyk) {
context.format_details.cmyk_bitmap = TRY(CMYKBitmap::create_with_size({ context.width, context.height }));
CMYK* data = context.format_details.cmyk_bitmap.value()->begin();
for (u64 i = 0; i < context.width * context.height; ++i) {
Array<u8, 4> pixel;
TRY(stream.read_until_filled(pixel));
context.bitmap->set_pixel(i % context.width, i / context.width, { pixel[0], pixel[1], pixel[2], pixel[3] });
data[i] = { pixel[0], pixel[1], pixel[2], pixel[3] };
}
} else {
TRY(create_bitmap(context));
for (u64 i = 0; i < context.width * context.height; ++i) {
if (is_gray) {
Array<u8, 1> pixel;
TRY(stream.read_until_filled(pixel));
context.bitmap->set_pixel(i % context.width, i / context.width, { pixel[0], pixel[0], pixel[0] });
} else if (is_gray_alpha) {
Array<u8, 2> pixel;
TRY(stream.read_until_filled(pixel));
context.bitmap->set_pixel(i % context.width, i / context.width, { pixel[0], pixel[0], pixel[0], pixel[1] });
} else if (is_rgb) {
Array<u8, 3> pixel;
TRY(stream.read_until_filled(pixel));
context.bitmap->set_pixel(i % context.width, i / context.width, { pixel[0], pixel[1], pixel[2] });
} else if (is_rgba) {
Array<u8, 4> pixel;
TRY(stream.read_until_filled(pixel));
context.bitmap->set_pixel(i % context.width, i / context.width, { pixel[0], pixel[1], pixel[2], pixel[3] });
}
}
}