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/*
* Copyright (c) 2020, Hüseyin ASLITÜRK <asliturk@hotmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "PPMLoader.h"
#include "PortableImageLoaderCommon.h"
#include "Streamer.h"
#include <AK/Endian.h>
#include <AK/LexicalPath.h>
#include <AK/ScopeGuard.h>
#include <AK/StringBuilder.h>
#include <string.h>
namespace Gfx {
struct PPMLoadingContext {
enum Type {
Unknown,
ASCII,
RAWBITS
};
enum State {
NotDecoded = 0,
Error,
MagicNumber,
Width,
Height,
Maxval,
Bitmap,
Decoded
};
static constexpr auto ascii_magic_number = '3';
static constexpr auto binary_magic_number = '6';
static constexpr auto image_type = "PPM";
Type type { Type::Unknown };
State state { State::NotDecoded };
const u8* data { nullptr };
size_t data_size { 0 };
u16 width { 0 };
u16 height { 0 };
u16 max_val { 0 };
RefPtr<Gfx::Bitmap> bitmap;
};
static bool read_image_data(PPMLoadingContext& context, Streamer& streamer)
{
Vector<Gfx::Color> color_data;
color_data.ensure_capacity(context.width * context.height);
if (context.type == PPMLoadingContext::ASCII) {
u16 red;
u16 green;
u16 blue;
while (true) {
if (!read_number(streamer, &red))
break;
if (!read_whitespace(context, streamer))
break;
if (!read_number(streamer, &green))
break;
if (!read_whitespace(context, streamer))
break;
if (!read_number(streamer, &blue))
break;
if (!read_whitespace(context, streamer))
break;
Color color { (u8)red, (u8)green, (u8)blue };
if (context.max_val < 255)
color = adjust_color(context.max_val, color);
color_data.append(color);
}
} else if (context.type == PPMLoadingContext::RAWBITS) {
u8 pixel[3];
while (streamer.read_bytes(pixel, 3)) {
color_data.append({ pixel[0], pixel[1], pixel[2] });
}
}
if (context.width * context.height != color_data.size())
return false;
if (!create_bitmap(context)) {
return false;
}
set_pixels(context, color_data);
context.state = PPMLoadingContext::State::Bitmap;
return true;
}
PPMImageDecoderPlugin::PPMImageDecoderPlugin(const u8* data, size_t size)
{
m_context = make<PPMLoadingContext>();
m_context->data = data;
m_context->data_size = size;
}
PPMImageDecoderPlugin::~PPMImageDecoderPlugin()
{
}
IntSize PPMImageDecoderPlugin::size()
{
if (m_context->state == PPMLoadingContext::State::Error)
return {};
if (m_context->state < PPMLoadingContext::State::Decoded) {
bool success = decode(*m_context);
if (!success)
return {};
}
return { m_context->width, m_context->height };
}
void PPMImageDecoderPlugin::set_volatile()
{
if (m_context->bitmap)
m_context->bitmap->set_volatile();
}
bool PPMImageDecoderPlugin::set_nonvolatile(bool& was_purged)
{
if (!m_context->bitmap)
return false;
return m_context->bitmap->set_nonvolatile(was_purged);
}
bool PPMImageDecoderPlugin::sniff()
{
if (m_context->data_size < 2)
return false;
if (m_context->data[0] == 'P' && m_context->data[1] == '3')
return true;
if (m_context->data[0] == 'P' && m_context->data[1] == '6')
return true;
return false;
}
bool PPMImageDecoderPlugin::is_animated()
{
return false;
}
size_t PPMImageDecoderPlugin::loop_count()
{
return 0;
}
size_t PPMImageDecoderPlugin::frame_count()
{
return 1;
}
ErrorOr<ImageFrameDescriptor> PPMImageDecoderPlugin::frame(size_t index)
{
if (index > 0)
return Error::from_string_literal("PPMImageDecoderPlugin: Invalid frame index"sv);
if (m_context->state == PPMLoadingContext::State::Error)
return Error::from_string_literal("PGMImageDecoderPlugin: Decoding failed"sv);
if (m_context->state < PPMLoadingContext::State::Decoded) {
bool success = decode(*m_context);
if (!success)
return Error::from_string_literal("PGMImageDecoderPlugin: Decoding failed"sv);
}
VERIFY(m_context->bitmap);
return ImageFrameDescriptor { m_context->bitmap, 0 };
}
}
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