mirror of
https://github.com/RGBCube/serenity
synced 2025-05-15 10:14:58 +00:00
187862ebe0
.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.
52 lines
2.1 KiB
C++
52 lines
2.1 KiB
C++
/*
|
|
* 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 {};
|
|
}
|
|
}
|