fastpng 0.1.8 2026-02-28

• Address rchk issues

fastpng 0.1.7 2025-01-14

• Address existing rchk errors on CRAN for resubmission

fastpng 0.1.6 2025-01-14

• Use {colorfast} for fast color lookup
• Set NO_REMAP in C

fastpng 0.1.5 2024-08-31

• Clarify copyright information. Sections withing spng.c are attributed to various authors.

fastpng 0.1.4 2024-08-25

• Standardise on spelling of color
• Include fast hashed color lookup when writing rasters
• Read/write PNGs from raw vectors
• Read/write from integer arrays
• Read/write indexed PNGs
• Support trns PNG transparency
• Support for both 8bit and 16bit values when erading/writing with arrays
• Bug fixes
• More test images and tests

fastpng 0.1.3 2024-02-03

• read_png() to read a PNG from a file or a raw vector
• write_png() to write data as a PNG file or PNG data in a raw vector
• get_png_info() - interrogate a vector of raw values containing a PNG image to determine image information i.e. width, height, bit_depth, color_type, compression_method, filter_method, interlace_method.

Supported R image types:

• Native Raster (integer matrix with class ‘nativeRaster’)
• Raster (character matrix with class ‘raster’) with hex color values of the form #RRGGBBAA or #RRGGBB. Note: R color names are not supported here.
• 3D numeric array containing RGBA values in the range [0, 1]
• 3D numeric array containing RGB values in the range [0, 1]
• 2D numeric matrix containing greyscale values in the range [0, 1]

spng 0.1.2

• Allow user to choose fmt and flags for PNG decoding

spng 0.1.1

• Get meta-info (width, height, etc) from image.

spng 0.1.0

• Initial release