libragephoto/doc/usage.doc

/*! \page Usage Using libragephoto

<h3 id="api_cxx">C++ API</h3>

<h4 id="cxx_include_usage">Including and using RagePhoto</h4>

Include RagePhoto

\code{.cpp}
#include <RagePhoto>
\endcode

Create a RagePhoto object

\code{.cpp}
RagePhoto ragePhoto;
\endcode

<h4 id="cxx_loading">Loading a Photo</h4>

From a file using RagePhoto::loadFile

\code{.cpp}
const char* filename = "PGTA5123456789";
const bool loaded = ragePhoto.loadFile(filename);
\endcode

From a file using RagePhoto::load(const std::string&)

\code{.cpp}
// Reading file
const char* filename = "PGTA5123456789";
std::ifstream ifs(filename, std::ios::in | std::ios::binary);
if (!ifs.is_open())
    return;
std::string sdata(std::istreambuf_iterator<char>{ifs}, {});
ifs.close();

// Loading file
const bool loaded = ragePhoto.load(sdata);
\endcode

From a char* using RagePhoto::load(const char*, size_t)

\code{.cpp}
const bool loaded = ragePhoto.load(data, size);
\endcode

<h4 id="cxx_using">Using a Photo</h4>

\code{.cpp}
// Returns the Photo Format
const uint32_t format = ragePhoto.format();

// Returns the JPEG as std::string
const std::string jpeg = ragePhoto.jpeg();

// Returns the JPEG as const char*
const char* jpeg = ragePhoto.jpegData();
const uint32_t size = ragePhoto.jpegSize();

// Returns the JSON 
const char* json = ragePhoto.json();

// Returns the Title 
const char* title = ragePhoto.title();
\endcode

Detecting if Photo is from GTA V or RDR 2

\code{.cpp}
switch (ragePhoto.format()) {
case RagePhoto::PhotoFormat::GTA5:
    std::cout << "GTA V format detected" << std::endl;
    break;
case RagePhoto::PhotoFormat::RDR2:
    std::cout << "RDR 2 format detected" << std::endl;
    break;
default:
    std::cout << "Unknown format detected" << std::endl;
}
\endcode

Saving the JPEG from a Photo

\code{.cpp}
// Example saveJpeg function
bool saveJpeg(RagePhoto* ragePhoto, const std::string& filename) {
    std::ofstream ofs(filename, std::ios::out | std::ios::binary | std::ios::trunc);
    if (!ofs.is_open())
        return false;
    ofs << ragePhoto->jpeg();
    const bool saved = ofs.good();
    ofs.close();
    return saved;
}

// Using the saveJpeg function
const char* filename = "PGTA5123456789.jpg";
const bool saved = saveJpeg(&ragePhoto, filename);
\endcode

Using the JPEG in GTK+ (gtkmm)

\code{.cpp}
// Writing pixbuf loader
GdkPixbufLoader* pixbuf_loader = gdk_pixbuf_loader_new();
gdk_pixbuf_loader_write(pixbuf_loader, reinterpret_cast<const guchar*>(ragePhoto.jpegData()), ragePhoto.jpegSize(), nullptr);
GdkPixbuf* pixbuf = gdk_pixbuf_loader_get_pixbuf(pixbuf_loader);
gdk_pixbuf_loader_close(pixbuf_loader, nullptr);

// Set image
Gtk::Image image;
image.set(Glib::wrap(pixbuf));
\endcode

Using the JPEG in Qt

\code{.cpp}
// Returns the JPEG as QImage
const QImage image = QImage::fromData(QByteArray::fromRawData(ragePhoto.jpegData(), ragePhoto.jpegSize()), "JPEG");

// Loading the JPEG in QImage
QImage image;
const bool loaded = image.loadFromData(QByteArray::fromRawData(ragePhoto.jpegData(), ragePhoto.jpegSize()), "JPEG");
\endcode

Using the JSON in Boost.JSON

\code{.cpp}
boost::json::error_code ec;
const boost::json::value jv = boost::json::parse(ragePhoto.json(), ec);
if (ec)
    return;
\endcode

Using the JSON in Qt

\code{.cpp}
const QJsonDocument jd = QJsonDocument::fromJson(ragePhoto.json());
if (jd.isNull())
    return;
\endcode

<h4 id="cxx_error">Detect Photo errors</h4>

\code{.cpp}
const int32_t error = ragePhoto.error();
switch (error) {
case RagePhoto::Error::NoFormatIdentifier:
    std::cout << "No format identifier" << std::endl;
    break;
case RagePhoto::Error::IncompatibleFormat:
    std::cout << "Incompatible format" << std::endl;
    break;
// Detect for more errors here...
case RagePhoto::Error::NoError:
    std::cout << "No error detected" << std::endl;
    break;
default:
    std::cout << "Unknown error detected" << std::endl;
}
\endcode

Available error codes: RagePhoto::Error

<h3 id="cmake">Including libragephoto in a CMake project</h3>

<h4 id="cmake_pkgconfig">Using PkgConfig</h4>

\code{.cmake}
find_package(PkgConfig REQUIRED)
pkg_check_modules(RAGEPHOTO REQUIRED ragephoto)
target_compile_options(your_project PRIVATE ${RAGEPHOTO_CFLAGS})
target_link_libraries(your_project PRIVATE ${RAGEPHOTO_LIBRARIES})
if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.13.0")
    target_link_directories(your_project PRIVATE ${RAGEPHOTO_LIBRARY_DIRS})
endif()
target_include_directories(your_project PRIVATE ${RAGEPHOTO_INCLUDE_DIRS})
\endcode

<h4 id="cmake_add_subdirectory">Using add_subdirectory</h4>

\code{.cmake}
add_subdirectory(src/libragephoto)
target_link_libraries(your_project PRIVATE ragephoto)
\endcode
*/