Magnum::Trade::PngImporter class

PNG importer plugin.

Supports Portable Network Graphics (*.png) RGB, RGBA or grayscale images with 8 and 16 bits per channel. Palleted images and images with transparency mask are automatically converted to RGB(A).

This plugin depends on the Trade and libPNG libraries and is built if WITH_PNGIMPORTER is enabled when building Magnum Plugins. To use as a dynamic plugin, you need to load the "PngImporter" plugin from MAGNUM_PLUGINS_IMPORTER_DIR. To use as a static plugin or as a dependency of another plugin with CMake, you need to request the PngImporter component of the MagnumPlugins package and link to the MagnumPlugins::PngImporter target. See Downloading and building plugins, Plugin usage with CMake and Loading and using plugins for more information.

The images are imported with PixelType::UnsignedByte / PixelType::UnsignedShort and PixelFormat::RGB, PixelFormat::RGBA or PixelFormat::Red, respectively. Grayscale images require extension ARB_texture_rg. All imported images use default PixelStorage parameters.

In OpenGL ES 2.0, if EXT_texture_rg is not supported and in WebGL 1.0, grayscale images use PixelFormat::Luminance instead of PixelFormat::Red.

Base classes

class AbstractImporter
Base for importer plugins.

Constructors, destructors, conversion operators

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

Private functions

auto doFeatures() const override -> Features virtual
Implementation for features()
auto doIsOpened() const override -> bool virtual
Implementation for isOpened()
void doClose() override virtual
Implementation for close()
void doOpenData(Containers::ArrayView<const char> data) override virtual
Implementation for openData()
auto doImage2DCount() const override -> UnsignedInt virtual
Implementation for image2DCount()
auto doImage2D(UnsignedInt id) override -> Containers::Optional<ImageData2D> virtual
Implementation for image2D()

Function documentation

UnsignedInt Magnum::Trade::PngImporter::doImage2DCount() const override virtual private

Implementation for image2DCount()

Default implementation returns 0.