class new in Git masterStbResizeImageConverter
Image resizing using stb_image_resize.
Performs downsampling and upsampling of 8-bit, 16-bit and float 2D and 2D array or cube images using the stb_
This plugin depends on the Trade library and is built if
MAGNUM_WITH_STBRESIZEIMAGECONVERTER is enabled when building Magnum Plugins. To use as a dynamic plugin, load
"StbResizeImageConverter" via Corrade::
Additionally, if you're using Magnum as a CMake subproject, bundle the magnum-plugins repository and do the following:
set(MAGNUM_WITH_STBRESIZEIMAGECONVERTER ON CACHE BOOL "" FORCE) add_subdirectory(magnum-plugins EXCLUDE_FROM_ALL) # So the dynamically loaded plugin gets built implicitly add_dependencies(your-app MagnumPlugins::StbResizeImageConverter)
To use as a static plugin or as a dependency of another plugin with CMake, put FindMagnumPlugins.cmake into your
modules/ directory, request the
StbResizeImageConverter component of the
MagnumPlugins package and link to the
find_package(MagnumPlugins REQUIRED StbResizeImageConverter) # ... target_link_libraries(your-app PRIVATE MagnumPlugins::StbResizeImageConverter)
Image flags are passed through unchanged. As the resizing operation operates in two dimensions, the
size option always takes a 2D size. 1D images and 1D array images (with ImageFlag2D::
Apart from the mandatory
size, other options can be set through configuration(). See below for all options and their default values:
[configuration] # Target width and height, separated by a space. Required. size= # By default, if the image is smaller than the provided size, it's upsampled. # Disable this option to keep smaller sizes as-is. The target size will be a # minimum of image size and target size in both dimensions, if the image is # smaller than target size in both dimensions the data will be copied # unchanged. upsample=true # How neighboring pixel values are retrieved on image edges. Valid values # are: # - clamp -- as if the edge pixels were extended # - wrap -- as if the image was repeated # - reflect -- as if the image was repeated and reflected # - zero -- uses zero values for out-of-bounds pixels edge=clamp # Sampling filter. Valid values are: # - box -- a trapezoid w/1-pixel wide ramps, same result as box for integer # scale ratios # - triangle -- on upsampling, produces same results as bilinear texture # filtering # - cubicspline -- the cubic b-spline (aka Mitchell-Netrevalli with # B=1,C=0), gaussian-esque # - catmullrom -- an interpolating cubic spline # - mitchell -- Mitchell-Netrevalli filter with B=1/3, C=1/3 # If empty, the default is catmullrom for upsampling and mitchell for # downsampling. filter= # Treat alpha as premultiplied. Image editors usually don't export # premultiplied alpha, so it's off by default. alphaPremultiplied=false # If the input format is sRGB, alpha is usually encoded as linear. Enable in # the unlikely case when alpha is sRGB-encoded as well. alphaUsesSrgb=false
See Editing plugin-specific configuration for more information and an example showing how to edit the configuration values.
- class AbstractImageConverter
- Base for image converter plugins.