ladybird/Userland/Libraries/LibGfx/ImageFormats/PBMLoader.cpp

/*
 * Copyright (c) 2020, Hüseyin ASLITÜRK <asliturk@hotmail.com>
 * Copyright (c) 2022, the SerenityOS developers.
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include "PBMLoader.h"
#include "AK/Endian.h"
#include "PortableImageLoaderCommon.h"
#include "Userland/Libraries/LibGfx/Streamer.h"
#include <string.h>

namespace Gfx {

bool read_image_data(PBMLoadingContext& context, Streamer& streamer)
{
    Vector<Gfx::Color> color_data;

    auto const context_size = context.width * context.height;
    color_data.resize(context_size);

    if (context.type == PBMLoadingContext::Type::ASCII) {
        for (u64 i = 0; i < context_size; ++i) {
            u8 byte;
            if (!streamer.read(byte))
                return false;
            if (byte == '0')
                color_data[i] = Color::White;
            else if (byte == '1')
                color_data[i] = Color::Black;
            else
                i--;
        }
    } else if (context.type == PBMLoadingContext::Type::RAWBITS) {
        for (u64 color_index = 0; color_index < context_size;) {
            u8 byte;
            if (!streamer.read(byte))
                return false;
            for (int i = 0; i < 8; i++) {
                int val = byte & 0x80;

                if (val == 0)
                    color_data[color_index] = Color::White;
                else
                    color_data[color_index] = Color::Black;

                byte = byte << 1;
                color_index++;

                if (color_index % context.width == 0) {
                    break;
                }
            }
        }
    }

    if (!create_bitmap(context)) {
        return false;
    }

    set_pixels(context, color_data);

    context.state = PBMLoadingContext::State::Bitmap;
    return true;
}
}