/* Copyright (C) 2015 Aaron Suen This program is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef _IMAGE_FILTERS_H_ #define _IMAGE_FILTERS_H_ #include "irrlichttypes_extrabloated.h" /* Fill in RGB values for transparent pixels, to correct for odd colors * appearing at borders when blending. This is because many PNG optimizers * like to discard RGB values of transparent pixels, but when blending then * with non-transparent neighbors, their RGB values will shpw up nonetheless. * * This function modifies the original image in-place. * * Parameter "threshold" is the alpha level below which pixels are considered * transparent. Should be 127 for 3d where alpha is threshold, but 0 for * 2d where alpha is blended. */ void imageCleanTransparent(video::IImage *src, u32 threshold); /* Scale a region of an image into another image, using nearest-neighbor with * anti-aliasing; treat pixels as crisp rectangles, but blend them at boundaries * to prevent non-integer scaling ratio artifacts. Note that this may cause * some blending at the edges where pixels don't line up perfectly, but this * filter is designed to produce the most accurate results for both upscaling * and downscaling. */ void imageScaleNNAA(video::IImage *src, const core::rect &srcrect, video::IImage *dest); #endif