Magnum::Trade::JpegImporter class

JPEG importer plugin.

Supports RGB or grayscale images with 8 bits per channel. The images are imported with PixelFormat::RGB8Unorm or PixelFormat::R8Unorm. All imported images use default PixelStorage parameters.

Usage

This plugin depends on the Trade and libJPEG libraries and is built if WITH_JPEGIMPORTER is enabled when building Magnum Plugins. To use as a dynamic plugin, load "JpegImporter" via Corrade::PluginManager::Manager.

Additionally, if you're using Magnum as a CMake subproject, bundle the magnum-plugins repository and do the following. Using libJPEG itself as a CMake subproject isn't tested at the moment, so you need to provide it as a system dependency and point CMAKE_PREFIX_PATH to its installation dir if necessary.

set(WITH_JPEGIMPORTER ON CACHE BOOL "" FORCE)
add_subdirectory(magnum-plugins EXCLUDE_FROM_ALL)

# So the dynamically loaded plugin gets built implicitly
add_dependencies(your-app MagnumPlugins::JpegImporter)

To use as a static plugin or as a dependency of another plugin with CMake, put FindMagnumPlugins.cmake into your modules/ directory, request the JpegImporter component of the MagnumPlugins package and link to the MagnumPlugins::JpegImporter target:

find_package(MagnumPlugins REQUIRED JpegImporter)

# ...
target_link_libraries(your-app PRIVATE MagnumPlugins::JpegImporter)

See Downloading and building plugins, Plugin usage with CMake and Loading and using plugins for more information.

libJPEG implementations

While some systems (such as macOS) still ship only with the vanilla libJPEG, you can get a much better decoding performance by using libjpeg-turbo.

Base classes

class AbstractImporter
Base for importer plugins.

Constructors, destructors, conversion operators

JpegImporter() explicit
Default constructor.
JpegImporter(PluginManager::AbstractManager& manager, const std::string& plugin) explicit
Plugin manager constructor.