// Platform implementation of EterLib/JpegFile.h. 40250 writes it with libjpeg-9a (JpegFile.cpp: a stdio
// destination manager, JCS_RGB, jpeg_set_defaults + jpeg_set_quality); here stb_image_write encodes the
// same input (top-down RGB rows, 3 bytes per pixel) at the same quality into a baseline JFIF file.
//
// Only jpeg_save has a caller in 40250 (CPythonGraphic::SaveJPEG, the screenshot key); the other
// declarations of JpegFile.h stay undefined.
#include "EterLib/StdAfx.h"
#include "EterLib/JpegFile.h"

#include <algorithm>
#include <string>

#define STB_IMAGE_WRITE_IMPLEMENTATION
#define STB_IMAGE_WRITE_STATIC
#define STBI_WRITE_NO_STDIO
#include "../third_party/stb_image_write.h"

namespace
{
void write_to_file(void* context, void* data, int size)
{
	fwrite(data, 1, size_t(size), static_cast<FILE*>(context));
}
}

int jpeg_save(unsigned char*data_d, int width, int height, int quality, const char*filename)
{
	// The Win32 CRT takes '\\' as a separator (grp.SaveScreenShot builds "<Documents>\\METIN2\\<time>.jpg").
	std::string path(filename);
	std::replace(path.begin(), path.end(), '\\', '/');
	FILE* fi = fopen(path.c_str(), "wb");
	if (fi == NULL)
		return 0;
	const int ok = stbi_write_jpg_to_func(write_to_file, fi, width, height, 3, data_d, quality);
	const bool closed = fclose(fi) == 0;
	return ok && closed ? 1 : 0;
}