mirror of
https://github.com/godotengine/godot.git
synced 2024-11-27 09:16:35 +08:00
214 lines
7.2 KiB
C
214 lines
7.2 KiB
C
// Copyright 2014 Google Inc. All Rights Reserved.
|
|
//
|
|
// Use of this source code is governed by a BSD-style license
|
|
// that can be found in the COPYING file in the root of the source
|
|
// tree. An additional intellectual property rights grant can be found
|
|
// in the file PATENTS. All contributing project authors may
|
|
// be found in the AUTHORS file in the root of the source tree.
|
|
// -----------------------------------------------------------------------------
|
|
//
|
|
// WebPPicture tools for measuring distortion
|
|
//
|
|
// Author: Skal (pascal.massimino@gmail.com)
|
|
|
|
#include <math.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "./vp8i_enc.h"
|
|
#include "../utils/utils.h"
|
|
|
|
typedef double (*AccumulateFunc)(const uint8_t* src, int src_stride,
|
|
const uint8_t* ref, int ref_stride,
|
|
int w, int h);
|
|
|
|
//------------------------------------------------------------------------------
|
|
// local-min distortion
|
|
//
|
|
// For every pixel in the *reference* picture, we search for the local best
|
|
// match in the compressed image. This is not a symmetrical measure.
|
|
|
|
#define RADIUS 2 // search radius. Shouldn't be too large.
|
|
|
|
static double AccumulateLSIM(const uint8_t* src, int src_stride,
|
|
const uint8_t* ref, int ref_stride,
|
|
int w, int h) {
|
|
int x, y;
|
|
double total_sse = 0.;
|
|
for (y = 0; y < h; ++y) {
|
|
const int y_0 = (y - RADIUS < 0) ? 0 : y - RADIUS;
|
|
const int y_1 = (y + RADIUS + 1 >= h) ? h : y + RADIUS + 1;
|
|
for (x = 0; x < w; ++x) {
|
|
const int x_0 = (x - RADIUS < 0) ? 0 : x - RADIUS;
|
|
const int x_1 = (x + RADIUS + 1 >= w) ? w : x + RADIUS + 1;
|
|
double best_sse = 255. * 255.;
|
|
const double value = (double)ref[y * ref_stride + x];
|
|
int i, j;
|
|
for (j = y_0; j < y_1; ++j) {
|
|
const uint8_t* const s = src + j * src_stride;
|
|
for (i = x_0; i < x_1; ++i) {
|
|
const double diff = s[i] - value;
|
|
const double sse = diff * diff;
|
|
if (sse < best_sse) best_sse = sse;
|
|
}
|
|
}
|
|
total_sse += best_sse;
|
|
}
|
|
}
|
|
return total_sse;
|
|
}
|
|
#undef RADIUS
|
|
|
|
static double AccumulateSSE(const uint8_t* src, int src_stride,
|
|
const uint8_t* ref, int ref_stride,
|
|
int w, int h) {
|
|
int y;
|
|
double total_sse = 0.;
|
|
for (y = 0; y < h; ++y) {
|
|
total_sse += VP8AccumulateSSE(src, ref, w);
|
|
src += src_stride;
|
|
ref += ref_stride;
|
|
}
|
|
return total_sse;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
static double AccumulateSSIM(const uint8_t* src, int src_stride,
|
|
const uint8_t* ref, int ref_stride,
|
|
int w, int h) {
|
|
const int w0 = (w < VP8_SSIM_KERNEL) ? w : VP8_SSIM_KERNEL;
|
|
const int w1 = w - VP8_SSIM_KERNEL - 1;
|
|
const int h0 = (h < VP8_SSIM_KERNEL) ? h : VP8_SSIM_KERNEL;
|
|
const int h1 = h - VP8_SSIM_KERNEL - 1;
|
|
int x, y;
|
|
double sum = 0.;
|
|
for (y = 0; y < h0; ++y) {
|
|
for (x = 0; x < w; ++x) {
|
|
sum += VP8SSIMGetClipped(src, src_stride, ref, ref_stride, x, y, w, h);
|
|
}
|
|
}
|
|
for (; y < h1; ++y) {
|
|
for (x = 0; x < w0; ++x) {
|
|
sum += VP8SSIMGetClipped(src, src_stride, ref, ref_stride, x, y, w, h);
|
|
}
|
|
for (; x < w1; ++x) {
|
|
const int off1 = x - VP8_SSIM_KERNEL + (y - VP8_SSIM_KERNEL) * src_stride;
|
|
const int off2 = x - VP8_SSIM_KERNEL + (y - VP8_SSIM_KERNEL) * ref_stride;
|
|
sum += VP8SSIMGet(src + off1, src_stride, ref + off2, ref_stride);
|
|
}
|
|
for (; x < w; ++x) {
|
|
sum += VP8SSIMGetClipped(src, src_stride, ref, ref_stride, x, y, w, h);
|
|
}
|
|
}
|
|
for (; y < h; ++y) {
|
|
for (x = 0; x < w; ++x) {
|
|
sum += VP8SSIMGetClipped(src, src_stride, ref, ref_stride, x, y, w, h);
|
|
}
|
|
}
|
|
return sum;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Distortion
|
|
|
|
// Max value returned in case of exact similarity.
|
|
static const double kMinDistortion_dB = 99.;
|
|
|
|
static double GetPSNR(double v, double size) {
|
|
return (v > 0. && size > 0.) ? -4.3429448 * log(v / (size * 255 * 255.))
|
|
: kMinDistortion_dB;
|
|
}
|
|
|
|
static double GetLogSSIM(double v, double size) {
|
|
v = (size > 0.) ? v / size : 1.;
|
|
return (v < 1.) ? -10.0 * log10(1. - v) : kMinDistortion_dB;
|
|
}
|
|
|
|
int WebPPlaneDistortion(const uint8_t* src, size_t src_stride,
|
|
const uint8_t* ref, size_t ref_stride,
|
|
int width, int height, size_t x_step,
|
|
int type, float* distortion, float* result) {
|
|
uint8_t* allocated = NULL;
|
|
const AccumulateFunc metric = (type == 0) ? AccumulateSSE :
|
|
(type == 1) ? AccumulateSSIM :
|
|
AccumulateLSIM;
|
|
if (src == NULL || ref == NULL ||
|
|
src_stride < x_step * width || ref_stride < x_step * width ||
|
|
result == NULL || distortion == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
VP8SSIMDspInit();
|
|
if (x_step != 1) { // extract a packed plane if needed
|
|
int x, y;
|
|
uint8_t* tmp1;
|
|
uint8_t* tmp2;
|
|
allocated =
|
|
(uint8_t*)WebPSafeMalloc(2ULL * width * height, sizeof(*allocated));
|
|
if (allocated == NULL) return 0;
|
|
tmp1 = allocated;
|
|
tmp2 = tmp1 + (size_t)width * height;
|
|
for (y = 0; y < height; ++y) {
|
|
for (x = 0; x < width; ++x) {
|
|
tmp1[x + y * width] = src[x * x_step + y * src_stride];
|
|
tmp2[x + y * width] = ref[x * x_step + y * ref_stride];
|
|
}
|
|
}
|
|
src = tmp1;
|
|
ref = tmp2;
|
|
}
|
|
*distortion = (float)metric(src, width, ref, width, width, height);
|
|
WebPSafeFree(allocated);
|
|
|
|
*result = (type == 1) ? (float)GetLogSSIM(*distortion, (double)width * height)
|
|
: (float)GetPSNR(*distortion, (double)width * height);
|
|
return 1;
|
|
}
|
|
|
|
int WebPPictureDistortion(const WebPPicture* src, const WebPPicture* ref,
|
|
int type, float results[5]) {
|
|
int w, h, c;
|
|
int ok = 0;
|
|
WebPPicture p0, p1;
|
|
double total_size = 0., total_distortion = 0.;
|
|
if (src == NULL || ref == NULL ||
|
|
src->width != ref->width || src->height != ref->height ||
|
|
results == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
VP8SSIMDspInit();
|
|
if (!WebPPictureInit(&p0) || !WebPPictureInit(&p1)) return 0;
|
|
w = src->width;
|
|
h = src->height;
|
|
if (!WebPPictureView(src, 0, 0, w, h, &p0)) goto Error;
|
|
if (!WebPPictureView(ref, 0, 0, w, h, &p1)) goto Error;
|
|
|
|
// We always measure distortion in ARGB space.
|
|
if (p0.use_argb == 0 && !WebPPictureYUVAToARGB(&p0)) goto Error;
|
|
if (p1.use_argb == 0 && !WebPPictureYUVAToARGB(&p1)) goto Error;
|
|
for (c = 0; c < 4; ++c) {
|
|
float distortion;
|
|
const size_t stride0 = 4 * (size_t)p0.argb_stride;
|
|
const size_t stride1 = 4 * (size_t)p1.argb_stride;
|
|
if (!WebPPlaneDistortion((const uint8_t*)p0.argb + c, stride0,
|
|
(const uint8_t*)p1.argb + c, stride1,
|
|
w, h, 4, type, &distortion, results + c)) {
|
|
goto Error;
|
|
}
|
|
total_distortion += distortion;
|
|
total_size += w * h;
|
|
}
|
|
|
|
results[4] = (type == 1) ? (float)GetLogSSIM(total_distortion, total_size)
|
|
: (float)GetPSNR(total_distortion, total_size);
|
|
ok = 1;
|
|
|
|
Error:
|
|
WebPPictureFree(&p0);
|
|
WebPPictureFree(&p1);
|
|
return ok;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|