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f37f9a6f0b
also fixes a bug with non-square handling before: getImageAverageColor [us] _____________________ 804x 11.253 after: imageAverageColorInline [us] __________________ 804x 0.557
49 lines
1.8 KiB
C++
49 lines
1.8 KiB
C++
// Luanti
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// SPDX-License-Identifier: LGPL-2.1-or-later
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// Copyright (C) 2015 Aaron Suen <warr1024@gmail.com>
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#pragma once
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#include "irrlichttypes.h"
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#include <rect.h>
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#include <SColor.h>
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namespace irr::video
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{
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class IVideoDriver;
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class IImage;
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}
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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 show 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 when the texture is used with ALPHA_CHANNEL_REF,
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* 0 when alpha blending is used.
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*/
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void imageCleanTransparent(video::IImage *src, u32 threshold);
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/* Returns the gamma-correct average color of the image, with transparent pixels
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* ignored. */
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video::SColor imageAverageColor(const video::IImage *img);
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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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/* Check and align image to npot2 if required by hardware
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* @param image image to check for npot2 alignment
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* @param driver driver to use for image operations
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* @return image or copy of image aligned to npot2
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*/
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video::IImage *Align2Npot2(video::IImage *image, video::IVideoDriver *driver);
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