img4d 1.1.2

img4d

PNG images Decoder/Encoder for D language. Please see current status on commit page or dub page

Please feel free to throw PRs or issues.

Examples

decode, convert to grayscale and encode

import some required modules

import img4d;
import std.stdio,
       std.range,
       std.algorithm.iteration;

load(decode)

Header hdr;
Pixel colorPix = hdr.load("png_img/lena.png");

rgb to grayscale

Pixel grayPix = hdr.rgbToGrayscale(colorPix, true);
hdr.colorType = colorTypes.grayscale;

save(encode)

bool encodedData = hdr.save(grayPix, "png_img/encoded_lena.png");

Package

img4d

img4d_lib.decode

img4d_lib.encode

img4dlib.colorspace

img4d_lib.edge

img4d

• ref auto load(ref Header header, string filename)
  
• ubyte[] save(ref Header header, ref Pixel pix, string filename)
  
• bool isGrayscale(int colorType)
• bool isColorNoneAlpha(int colorType)
• auto canny(T)(T[][] actualData, int tMin, int tMax)
  
• ref auto rgbToGrayscale(T)(ref Header header, ref Pixel pix, bool fastMode=false)
  
• pure auto toBinary(T)(ref T[][] gray, T threshold=127)
  
• pure auto toBinary(T)(T[][] array)
  
• pure auto differ(T)(ref T[][] origin, ref T[][] target)
  
• pure auto mask(T)(ref T[][][] colorTarget, ref T[][] gray)
  

img4d_lib.decode

• Header readIHDR(ubyte[] header) Set Header struct and Return its struct
  
• Params: ubyte[] header: Header byte-data
  
• int byteToInt(T)(T[] data) Return ChunkData-length(Convert byte array to int)
  
• string byteToString(T)(T[] data) Return Chunk Type(Convert byte array to string)
  
• ubyte[] readIDAT(ubyte[] data) Calculate CRC and Return IDAT Chunk-Data
  
• Params: ubyte[] data : IDAT array expect for Chunk-Data-Size
  
• void crcCheck(ubyte[] crc, in ubyte[] chunk) The function of CRC calculation
  
• Params ubyte[] crc : The CRC code at the end of the chunk ubyte[] chunk : Byte array to be CRC calculated
  
• int paethPredictor(int left, int upper, int upperLeft) Calculate and Return Paeth-Predictor
  
• auto normalizePixelValue(T)(T value) Return the value which are subtracted 256 if it exceeds 256
  
• int[][] inverseFiltering(string op, string inequality, string inverseOp)(ubyte[][] data)
  
• int[][] parse(ref Header info, string filename)
  

img4d_lib.encode

• ubyte[] makeIHDR(in Header info) Return IHDR which required for encoding
  
• Params: Header info : arranged Header
  
• ubyte[] makeIDAT(T)(T[][] actualData, in Header info) Return IDAT which required for encoding
  
• Params: T actualData : IDAT chunk data Header info : arranged Header
  
• ubyte[] makeAncillary() Not implemented
  
• ubyte[] makeIEND() Return IEND which required for encoding
  
• auto makeCrc(in ubyte[] data) Calculate and Return CRC value
  
• auto sumScanline(ubyte[][] src) Cast to int[] and Calculate sum every horizontal line
  
• auto chooseFilterType(ref Header header, ref Pixel pix) Choose optimal filter and Return filtered pixel

img4d_lib.filter

• pure ref auto inverseSub(ref ubyte[][] scanline)
  
• ref auto inverseSub(ref ubyte[][] scanline, bool gray)
• pure ubyte[][] sub(ref ubyte[][] src) Calculate and Return Sub filter(Difference from left pixel)
• pure ubyte[][] up(ref ubyte[][] src)
  
• pure ubyte[][] neighborDifference(ubyte[][] src) Calculate difference neighbor pixel
• pure ref auto joinVertical(T)(ref T[][] src) Make array vertical
• auto inverseUp()
  
• auto ave()
  
• auto inverseAve()
  
• auto paeth()
  
• auto inversePaeth()
  

img4dlib.colorspace

• ref auto toGrayscale(T)(ref T[][][] color) Convert to grayscale by weighting
  

img4d_lib.edge

• auto differential(T)(T[][] array, T[][] filter)
  
• auto gradient(T)(T[][] Gr, T[][] Gth)
  
• auto hysteresis(T)(T[][] src, int t_min, int t_max)