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/*
* Copyright (c) 2020, Hüseyin ASLITÜRK <asliturk@hotmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "PGMLoader.h"
#include "PortableImageLoaderCommon.h"
#include "Streamer.h"
#include <AK/Endian.h>
#include <string.h>
namespace Gfx {
struct PGMLoadingContext {
enum Type {
Unknown,
ASCII,
RAWBITS
};
enum State {
NotDecoded = 0,
Error,
MagicNumber,
Width,
Height,
Maxval,
Bitmap,
Decoded
};
static constexpr auto ascii_magic_number = '2';
static constexpr auto binary_magic_number = '5';
static constexpr auto image_type = "PGM";
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 void set_adjusted_pixels(PGMLoadingContext& context, const Vector<Gfx::Color>& color_data)
{
size_t index = 0;
for (size_t y = 0; y < context.height; ++y) {
for (size_t x = 0; x < context.width; ++x) {
Color color = color_data.at(index);
if (context.max_val < 255) {
color = adjust_color(context.max_val, color);
}
context.bitmap->set_pixel(x, y, color);
++index;
}
}
}
static bool read_image_data(PGMLoadingContext& context, Streamer& streamer)
{
Vector<Gfx::Color> color_data;
if (context.type == PGMLoadingContext::ASCII) {
u16 value;
while (true) {
if (!read_number(streamer, &value))
break;
if (!read_whitespace(context, streamer))
break;
color_data.append({ (u8)value, (u8)value, (u8)value });
}
} else if (context.type == PGMLoadingContext::RAWBITS) {
u8 pixel;
while (streamer.read(pixel)) {
color_data.append({ pixel, pixel, pixel });
}
}
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_adjusted_pixels(context, color_data);
context.state = PGMLoadingContext::State::Bitmap;
return true;
}
PGMImageDecoderPlugin::PGMImageDecoderPlugin(const u8* data, size_t size)
{
m_context = make<PGMLoadingContext>();
m_context->data = data;
m_context->data_size = size;
}
PGMImageDecoderPlugin::~PGMImageDecoderPlugin()
{
}
IntSize PGMImageDecoderPlugin::size()
{
if (m_context->state == PGMLoadingContext::State::Error)
return {};
if (m_context->state < PGMLoadingContext::State::Decoded) {
bool success = decode(*m_context);
if (!success)
return {};
}
return { m_context->width, m_context->height };
}
void PGMImageDecoderPlugin::set_volatile()
{
if (m_context->bitmap)
m_context->bitmap->set_volatile();
}
bool PGMImageDecoderPlugin::set_nonvolatile(bool& was_purged)
{
if (!m_context->bitmap)
return false;
return m_context->bitmap->set_nonvolatile(was_purged);
}
bool PGMImageDecoderPlugin::sniff()
{
if (m_context->data_size < 2)
return false;
if (m_context->data[0] == 'P' && m_context->data[1] == '2')
return true;
if (m_context->data[0] == 'P' && m_context->data[1] == '5')
return true;
return false;
}
bool PGMImageDecoderPlugin::is_animated()
{
return false;
}
size_t PGMImageDecoderPlugin::loop_count()
{
return 0;
}
size_t PGMImageDecoderPlugin::frame_count()
{
return 1;
}
ImageFrameDescriptor PGMImageDecoderPlugin::frame(size_t i)
{
if (i > 0)
return {};
if (m_context->state == PGMLoadingContext::State::Error)
return {};
if (m_context->state < PGMLoadingContext::State::Decoded) {
bool success = decode(*m_context);
if (!success)
return {};
}
VERIFY(m_context->bitmap);
return { m_context->bitmap, 0 };
}
}
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