client/src/imgutils.h

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) Proxmark3 contributors. See AUTHORS.md for details.
   3 //
   4 // This program is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // This program is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // See LICENSE.txt for the text of the license.
  15 //-----------------------------------------------------------------------------
  16 // Image utilities
  17 //-----------------------------------------------------------------------------
  18 #ifndef IMGUTILS_H__
  19 #define IMGUTILS_H__
  20
  21 #include <gd.h>
  22
  23 /*
  24  * Converts a true color image to a palette image, using Floyd-Steinberg dithering.
  25  *
  26  * For color matching, this function uses the Euclidean distance between colors in the
  27  * YCbCr color space, which yields to better results than using sRGB directly.
  28  *
  29  * A comparison can be found at https://twitter.com/Socram4x8/status/1733157380097995205/photo/1.
  30  */
  31 gdImagePtr img_palettize(gdImagePtr rgb, int *palette, int palette_size);
  32
  33 /*
  34  * This function scales and crops the image to the given size.
  35  * Think of "background-size: cover" in CSS.
  36  */
  37 gdImagePtr img_crop_to_fit(gdImagePtr orig, int width, int height);
  38
  39 #endif