1// basisu_ssim.h
2// Copyright (C) 2019 Binomial LLC. All Rights Reserved.
3//
4// Licensed under the Apache License, Version 2.0 (the "License");
5// you may not use this file except in compliance with the License.
6// You may obtain a copy of the License at
7//
8// http://www.apache.org/licenses/LICENSE-2.0
9//
10// Unless required by applicable law or agreed to in writing, software
11// distributed under the License is distributed on an "AS IS" BASIS,
12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13// See the License for the specific language governing permissions and
14// limitations under the License.
15#pragma once
16#include "basisu_enc.h"
17
18namespace basisu
19{
20 float gauss(int x, int y, float sigma_sqr);
21
22 enum
23 {
24 cComputeGaussianFlagNormalize = 1,
25 cComputeGaussianFlagPrint = 2,
26 cComputeGaussianFlagNormalizeCenterToOne = 4
27 };
28
29 void compute_gaussian_kernel(float *pDst, int size_x, int size_y, float sigma_sqr, uint32_t flags = 0);
30
31 void scale_image(const imagef &src, imagef &dst, const vec4F &scale, const vec4F &shift);
32 void add_weighted_image(const imagef &src1, const vec4F &alpha, const imagef &src2, const vec4F &beta, const vec4F &gamma, imagef &dst);
33 void add_image(const imagef &src1, const imagef &src2, imagef &dst);
34 void adds_image(const imagef &src, const vec4F &value, imagef &dst);
35 void mul_image(const imagef &src1, const imagef &src2, imagef &dst, const vec4F &scale);
36 void div_image(const imagef &src1, const imagef &src2, imagef &dst, const vec4F &scale);
37 vec4F avg_image(const imagef &src);
38
39 void gaussian_filter(imagef &dst, const imagef &orig_img, uint32_t odd_filter_width, float sigma_sqr, bool wrapping = false, uint32_t width_divisor = 1, uint32_t height_divisor = 1);
40
41 vec4F compute_ssim(const imagef &a, const imagef &b);
42 vec4F compute_ssim(const image &a, const image &b, bool luma, bool luma_601);
43
44} // namespace basisu
45