mirror of
https://github.com/moparisthebest/minetest
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47 lines
1.9 KiB
C
47 lines
1.9 KiB
C
/*
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Copyright (C) 2015 Aaron Suen <warr1024@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef _IMAGE_FILTERS_H_
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#define _IMAGE_FILTERS_H_
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#include "irrlichttypes_extrabloated.h"
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/* Fill in RGB values for transparent pixels, to correct for odd colors
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* appearing at borders when blending. This is because many PNG optimizers
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* like to discard RGB values of transparent pixels, but when blending then
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* with non-transparent neighbors, their RGB values will shpw up nonetheless.
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*
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* This function modifies the original image in-place.
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*
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* Parameter "threshold" is the alpha level below which pixels are considered
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* transparent. Should be 127 for 3d where alpha is threshold, but 0 for
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* 2d where alpha is blended.
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*/
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void imageCleanTransparent(video::IImage *src, u32 threshold);
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/* Scale a region of an image into another image, using nearest-neighbor with
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* anti-aliasing; treat pixels as crisp rectangles, but blend them at boundaries
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* to prevent non-integer scaling ratio artifacts. Note that this may cause
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* some blending at the edges where pixels don't line up perfectly, but this
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* filter is designed to produce the most accurate results for both upscaling
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* and downscaling.
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*/
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void imageScaleNNAA(video::IImage *src, const core::rect<s32> &srcrect, video::IImage *dest);
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#endif
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