f3ff9c26bc
This enum used to store very precise state about the decoding process, let's simplify that by only including two steps: HeaderDecoder and BitmapDecoded.
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
/*
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* Copyright (c) 2020, Hüseyin ASLITÜRK <asliturk@hotmail.com>
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* Copyright (c) 2022, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "PBMLoader.h"
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#include "PortableImageLoaderCommon.h"
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namespace Gfx {
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ErrorOr<void> read_image_data(PBMLoadingContext& context)
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{
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TRY(create_bitmap(context));
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auto& stream = *context.stream;
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auto const context_size = context.width * context.height;
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if (context.type == PBMLoadingContext::Type::ASCII) {
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for (u64 i = 0; i < context_size; ++i) {
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auto const byte = TRY(stream.read_value<u8>());
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if (byte == '0')
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context.bitmap->set_pixel(i % context.width, i / context.width, Color::White);
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else if (byte == '1')
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context.bitmap->set_pixel(i % context.width, i / context.width, Color::Black);
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else
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i--;
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}
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} else if (context.type == PBMLoadingContext::Type::RAWBITS) {
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for (u64 color_index = 0; color_index < context_size;) {
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auto byte = TRY(stream.read_value<u8>());
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for (int i = 0; i < 8; i++) {
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auto const val = byte & 0x80;
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if (val == 0)
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context.bitmap->set_pixel(color_index % context.width, color_index / context.width, Color::White);
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else
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context.bitmap->set_pixel(color_index % context.width, color_index / context.width, Color::Black);
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byte = byte << 1;
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color_index++;
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if (color_index % context.width == 0) {
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break;
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}
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}
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}
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}
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context.state = PBMLoadingContext::State::BitmapDecoded;
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return {};
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}
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}
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