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LibGfx: Add a .pam loader

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.pam is a "portrable arbitrarymap" as documented at
https://netpbm.sourceforge.net/doc/pam.html

It's very similar to .pbm, .pgm, and .ppm, so this uses the
PortableImageMapLoader framework. The header is slightly different,
so this has a custom header parsing function.

Also, .pam only exixts in binary form, so the ascii form support
becomes optional.
This commit is contained in:
Nico Weber 2024-01-24 21:27:24 -05:00 • committed by Andreas Kling
parent 0d76a9da17
commit 187862ebe0
9 changed files with 173 additions and 9 deletions
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52
Userland/Libraries/LibGfx/ImageFormats/PAMLoader.cpp Normal file
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/*
* Copyright (c) 2024, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "PAMLoader.h"
#include "PortableImageLoaderCommon.h"
namespace Gfx {
ErrorOr<void> read_image_data(PAMLoadingContext& context)
{
VERIFY(context.type == PAMLoadingContext::Type::RAWBITS);
// FIXME: Technically it's more to spec to check that a known tupl type has a minimum depth and then skip additional channels.
bool is_gray = context.format_details.depth == 1 && context.format_details.tupl_type == "GRAYSCALE"sv;
bool is_gray_alpha = context.format_details.depth == 2 && context.format_details.tupl_type == "GRAYSCALE_ALPHA"sv;
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);
TRY(create_bitmap(context));
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) {
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] });
}
}
context.state = PAMLoadingContext::State::BitmapDecoded;
return {};
}
}