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Keep planarized reference image around across runs

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This commit is contained in:
Surma
2020-09-09 12:50:02 +01:00
parent 4b6334a212
commit ebdb00f50d
4 changed files with 113 additions and 89 deletions
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16
cli/index.js
View File

@ -24,10 +24,16 @@ async function optimize(bitmapIn, encode, decode) {
let bitmapOut;
let binaryOut;
const { visdif } = await visdifModule();
const { VisDiff } = await visdifModule();
const comparator = new VisDiff(
bitmapIn.data,
bitmapIn.width,
bitmapIn.height
);
do {
binaryOut = await encode(bitmapIn, quality);
bitmapOut = await decode(binaryOut);
butteraugliDistance = comparator.distance(bitmapOut.data);
console.log({
butteraugliDistance,
quality,
@ -35,12 +41,6 @@ async function optimize(bitmapIn, encode, decode) {
binaryOut,
bitmapOut
});
butteraugliDistance = visdif(
bitmapIn.data,
bitmapOut.data,
bitmapIn.width,
bitmapIn.height
);
if (butteraugliDistance > butteraugliGoal) {
quality += inc;
} else {
@ -53,6 +53,8 @@ async function optimize(bitmapIn, encode, decode) {
attempts < maxRounds
);
comparator.delete();
return {
bitmap: bitmapOut,
binary: binaryOut,

85
codecs/visdif/visdif.cpp
View File

@ -5,50 +5,57 @@
using namespace emscripten;
using namespace butteraugli;
double visdif(std::string rgba1, std::string rgba2, int width, int height) {
const char* rgba1p = rgba1.c_str();
const char* rgba2p = rgba2.c_str();
// One Image8 for each color channel + alpha
std::vector<ImageF> img1;
img1.push_back(ImageF(width, height));
img1.push_back(ImageF(width, height));
img1.push_back(ImageF(width, height));
img1.push_back(ImageF(width, height));
std::vector<ImageF> img2;
img2.push_back(ImageF(width, height));
img2.push_back(ImageF(width, height));
img2.push_back(ImageF(width, height));
img2.push_back(ImageF(width, height));
// Convert from interleaved RGBA to separate channels
// Turns an interleaved RGBA buffer into 4 planes for each color channel
void planarize(std::vector<ImageF>& img,
const char* rgba,
int width,
int height,
float gamma = 2.2) {
assert(img.size() == 0);
img.push_back(ImageF(width, height));
img.push_back(ImageF(width, height));
img.push_back(ImageF(width, height));
img.push_back(ImageF(width, height));
for (int y = 0; y < height; y++) {
float* const img1_row_r = img1[0].Row(y);
float* const img1_row_g = img1[1].Row(y);
float* const img1_row_b = img1[2].Row(y);
float* const img1_row_a = img1[3].Row(y);
float* const img2_row_r = img2[0].Row(y);
float* const img2_row_g = img2[1].Row(y);
float* const img2_row_b = img2[2].Row(y);
float* const img2_row_a = img2[3].Row(y);
float* const row_r = img[0].Row(y);
float* const row_g = img[1].Row(y);
float* const row_b = img[2].Row(y);
float* const row_a = img[3].Row(y);
for (int x = 0; x < width; x++) {
img1_row_r[x] = 255.0 * pow(rgba1p[y * width * 4 + x * 4 + 0] / 255.0, 2.2);
img1_row_g[x] = 255.0 * pow(rgba1p[y * width * 4 + x * 4 + 1] / 255.0, 2.2);
img1_row_b[x] = 255.0 * pow(rgba1p[y * width * 4 + x * 4 + 2] / 255.0, 2.2);
img1_row_a[x] = 255.0 * pow(rgba1p[y * width * 4 + x * 4 + 3] / 255.0, 2.2);
img2_row_r[x] = 255.0 * pow(rgba2p[y * width * 4 + x * 4 + 0] / 255.0, 2.2);
img2_row_g[x] = 255.0 * pow(rgba2p[y * width * 4 + x * 4 + 1] / 255.0, 2.2);
img2_row_b[x] = 255.0 * pow(rgba2p[y * width * 4 + x * 4 + 2] / 255.0, 2.2);
img2_row_a[x] = 255.0 * pow(rgba2p[y * width * 4 + x * 4 + 3] / 255.0, 2.2);
row_r[x] = 255.0 * pow(rgba[y * width * 4 + x * 4 + 0] / 255.0, gamma);
row_g[x] = 255.0 * pow(rgba[y * width * 4 + x * 4 + 1] / 255.0, gamma);
row_b[x] = 255.0 * pow(rgba[y * width * 4 + x * 4 + 2] / 255.0, gamma);
row_a[x] = 255.0 * pow(rgba[y * width * 4 + x * 4 + 3] / 255.0, gamma);
}
}
ImageF diffmap;
double diffvalue;
if (!ButteraugliInterface(img1, img2, 1.0, diffmap, diffvalue)) {
return -1.0;
}
return diffvalue;
}
class VisDiff {
private:
std::vector<ImageF> ref_img;
int width;
int height;
public:
VisDiff(std::string ref_img, int width, int height) {
planarize(this->ref_img, ref_img.c_str(), width, height);
this->width = width;
this->height = height;
}
double distance(std::string other_img) {
std::vector<ImageF> img;
planarize(img, other_img.c_str(), width, height);
ImageF diffmap;
double diffvalue;
if (!ButteraugliInterface(ref_img, img, 1.0, diffmap, diffvalue)) {
return -1.0;
}
return diffvalue;
}
};
EMSCRIPTEN_BINDINGS(my_module) {
function("visdif", &visdif);
class_<VisDiff>("VisDiff").constructor<std::string, int, int>().function("distance",
&VisDiff::distance);
}

101
codecs/visdif/visdif.js
View File

@ -7,49 +7,64 @@ function(visdif) {
visdif = visdif || {};
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codecs/visdif/visdif.wasm
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