2 Copyright (C) 2015 Aaron Suen <warr1024@gmail.com>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU Lesser General Public License as published by
6 the Free Software Foundation; either version 2.1 of the License, or
7 (at your option) any later version.
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 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public License along
15 with this program; if not, write to the Free Software Foundation, Inc.,
16 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 #ifndef _IMAGE_FILTERS_H_
20 #define _IMAGE_FILTERS_H_
22 #include "irrlichttypes_extrabloated.h"
24 /* Fill in RGB values for transparent pixels, to correct for odd colors
25 * appearing at borders when blending. This is because many PNG optimizers
26 * like to discard RGB values of transparent pixels, but when blending then
27 * with non-transparent neighbors, their RGB values will shpw up nonetheless.
29 * This function modifies the original image in-place.
31 * Parameter "threshold" is the alpha level below which pixels are considered
32 * transparent. Should be 127 for 3d where alpha is threshold, but 0 for
33 * 2d where alpha is blended.
35 void imageCleanTransparent(video::IImage *src, u32 threshold);
37 /* Scale a region of an image into another image, using nearest-neighbor with
38 * anti-aliasing; treat pixels as crisp rectangles, but blend them at boundaries
39 * to prevent non-integer scaling ratio artifacts. Note that this may cause
40 * some blending at the edges where pixels don't line up perfectly, but this
41 * filter is designed to produce the most accurate results for both upscaling
44 void imageScaleNNAA(video::IImage *src, const core::rect<s32> &srcrect, video::IImage *dest);