/*

 * Copyright (c) 2020, Hüseyin ASLITÜRK <asliturk@hotmail.com>

 * Copyright (c) 2022, the SerenityOS developers.

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#include "PBMLoader.h"

#include "PortableImageLoaderCommon.h"

namespace Gfx {

ErrorOr<void> read_image_data(PBMLoadingContext& context)

{

    TRY(create_bitmap(context));

    auto& stream = *context.stream;

    auto const context_size = context.width * context.height;

    if (context.type == PBMLoadingContext::Type::ASCII) {

        for (u64 i = 0; i < context_size; ++i) {

            auto const byte = TRY(stream.read_value<u8>());

            if (byte == '0')

                context.bitmap->set_pixel(i % context.width, i / context.width, Color::White);

            else if (byte == '1')

                context.bitmap->set_pixel(i % context.width, i / context.width, Color::Black);

            else

                i--;

        }

    } else if (context.type == PBMLoadingContext::Type::RAWBITS) {

        for (u64 color_index = 0; color_index < context_size;) {

            auto byte = TRY(stream.read_value<u8>());

            for (int i = 0; i < 8; i++) {

                auto const val = byte & 0x80;

                if (val == 0)

                    context.bitmap->set_pixel(color_index % context.width, color_index / context.width, Color::White);

                else

                    context.bitmap->set_pixel(color_index % context.width, color_index / context.width, Color::Black);

                byte = byte << 1;

                color_index++;

                if (color_index % context.width == 0) {

                    break;

                }

            }

        }

    }

    return {};

}

}