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feat: write generation parameter exif data into output png (#57)

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* Write generation parameter exif data into output pngs.

This adds prompt, negative prompt (if nonempty) and other generation
parameters to the output file as a tEXt PNG block, in the same format as
AUTOMATIC1111 webui does.

In order to keep everything free of external library dependencies, I
have somewhat dirtily hacked this into the stb_image_write
implementation.

* Mention png text data in README.md, include "karras" in sampler text

* add Steps/Model/RNG to parameter string

---------

Co-authored-by: leejet <leejet714@gmail.com>
This commit is contained in:
Urs Ganse
2023-09-18 16:09:15 +03:00
committed by GitHub
parent bd62138751
commit afec5051cf
3 changed files with 55 additions and 8 deletions
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31
examples/main.cpp
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@@ -365,6 +365,18 @@ void parse_args(int argc, const char* argv[], Option* opt) {
}
}
std::string basename(const std::string& path) {
size_t pos = path.find_last_of('/');
if (pos != std::string::npos) {
return path.substr(pos + 1);
}
pos = path.find_last_of('\\');
if (pos != std::string::npos) {
return path.substr(pos + 1);
}
return path;
}
int main(int argc, const char* argv[]) {
Option opt;
parse_args(argc, argv, &opt);
@@ -437,7 +449,24 @@ int main(int argc, const char* argv[]) {
return 1;
}
stbi_write_png(opt.output_path.c_str(), opt.w, opt.h, 3, img.data(), 0);
std::string parameter_string = opt.prompt + "\n";
if (opt.negative_prompt.size() != 0) {
parameter_string += "Negative prompt: " + opt.negative_prompt + "\n";
}
parameter_string += "Steps: " + std::to_string(opt.sample_steps) + ", ";
parameter_string += "CFG scale: " + std::to_string(opt.cfg_scale) + ", ";
parameter_string += "Seed: " + std::to_string(opt.seed) + ", ";
parameter_string += "Size: " + std::to_string(opt.w) + "x" + std::to_string(opt.h) + ", ";
parameter_string += "Model: " + basename(opt.model_path) + ", ";
parameter_string += "RNG: " + std::string(rng_type_to_str[opt.rng_type]) + ", ";
parameter_string += "Sampler: " + std::string(sample_method_str[opt.sample_method]);
if (opt.schedule == KARRAS) {
parameter_string += " karras";
}
parameter_string += ", ";
parameter_string += "Version: stable-diffusion.cpp";
stbi_write_png(opt.output_path.c_str(), opt.w, opt.h, 3, img.data(), 0, parameter_string.c_str());
printf("save result image to '%s'\n", opt.output_path.c_str());
return 0;