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/*
* Copyright (c) 2020, Hüseyin ASLITÜRK <asliturk@hotmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "PBMLoader.h"
#include "PortableImageLoaderCommon.h"
#include "Streamer.h"
#include <AK/Endian.h>
#include <string.h>
namespace Gfx {
struct PBMLoadingContext {
enum Type {
Unknown,
ASCII,
RAWBITS
};
enum State {
NotDecoded = 0,
Error,
MagicNumber,
Width,
Height,
Bitmap,
Decoded
};
static constexpr auto ascii_magic_number = '1';
static constexpr auto binary_magic_number = '4';
static constexpr auto image_type = "PBM";
Type type { Type::Unknown };
State state { State::NotDecoded };
const u8* data { nullptr };
size_t data_size { 0 };
size_t width { 0 };
size_t height { 0 };
RefPtr<Gfx::Bitmap> bitmap;
};
static bool read_image_data(PBMLoadingContext& context, Streamer& streamer)
{
u8 byte;
Vector<Gfx::Color> color_data;
if (context.type == PBMLoadingContext::ASCII) {
while (streamer.read(byte)) {
if (byte == '0') {
color_data.append(Color::White);
} else if (byte == '1') {
color_data.append(Color::Black);
}
}
} else if (context.type == PBMLoadingContext::RAWBITS) {
size_t color_index = 0;
while (streamer.read(byte)) {
for (int i = 0; i < 8; i++) {
int val = byte & 0x80;
if (val == 0) {
color_data.append(Color::White);
} else {
color_data.append(Color::Black);
}
byte = byte << 1;
color_index++;
if (color_index % context.width == 0) {
break;
}
}
}
}
size_t context_size = (u32)context.width * (u32)context.height;
if (context_size != color_data.size()) {
dbgln("Not enough color data in image.");
return false;
}
if (!create_bitmap(context)) {
return false;
}
set_pixels(context, color_data);
context.state = PBMLoadingContext::State::Bitmap;
return true;
}
PBMImageDecoderPlugin::PBMImageDecoderPlugin(const u8* data, size_t size)
{
m_context = make<PBMLoadingContext>();
m_context->data = data;
m_context->data_size = size;
}
PBMImageDecoderPlugin::~PBMImageDecoderPlugin()
{
}
IntSize PBMImageDecoderPlugin::size()
{
if (m_context->state == PBMLoadingContext::State::Error)
return {};
if (m_context->state < PBMLoadingContext::State::Decoded) {
bool success = decode(*m_context);
if (!success)
return {};
}
return { m_context->width, m_context->height };
}
void PBMImageDecoderPlugin::set_volatile()
{
if (m_context->bitmap)
m_context->bitmap->set_volatile();
}
bool PBMImageDecoderPlugin::set_nonvolatile(bool& was_purged)
{
if (!m_context->bitmap)
return false;
return m_context->bitmap->set_nonvolatile(was_purged);
}
bool PBMImageDecoderPlugin::sniff()
{
if (m_context->data_size < 2)
return false;
if (m_context->data[0] == 'P' && m_context->data[1] == '1')
return true;
if (m_context->data[0] == 'P' && m_context->data[1] == '4')
return true;
return false;
}
bool PBMImageDecoderPlugin::is_animated()
{
return false;
}
size_t PBMImageDecoderPlugin::loop_count()
{
return 0;
}
size_t PBMImageDecoderPlugin::frame_count()
{
return 1;
}
ErrorOr<ImageFrameDescriptor> PBMImageDecoderPlugin::frame(size_t index)
{
if (index > 0)
return Error::from_string_literal("PBMImageDecoderPlugin: Invalid frame index"sv);
if (m_context->state == PBMLoadingContext::State::Error)
return Error::from_string_literal("PBMImageDecoderPlugin: Decoding failed"sv);
if (m_context->state < PBMLoadingContext::State::Decoded) {
bool success = decode(*m_context);
if (!success)
return Error::from_string_literal("PBMImageDecoderPlugin: Decoding failed"sv);
}
VERIFY(m_context->bitmap);
return ImageFrameDescriptor { m_context->bitmap, 0 };
}
}
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