A super short and streamlined C/C++ function for writing .tga images to file! No dependencies, and no cruft.

tga.h

// Copyright(c) 2019 Nick Klingensmith (@koujaku). All rights reserved.
//
// This work is licensed under the terms of the MIT license.
// For a copy of this license, see < https://opensource.org/licenses/MIT >

#pragma once

#include <stdio.h>
#include <stdint.h>

/// <summary> Writes an uncompressed 24 or 32 bit .tga image to the indicated file! </summary>
/// <param name='filename'>I'd recommended you add a '.tga' to the end of this filename.</param>
/// <param name='dataBGRA'>A chunk of color data, one channel per byte, ordered as BGRA. Size should be width*height*dataChanels.</param>
/// <param name='dataChannels'>The number of channels in the color data. Use 1 for grayscale, 3 for BGR, and 4 for BGRA.</param>
/// <param name='fileChannels'>The number of color channels to write to file. Must be 3 for BGR, or 4 for BGRA. Does NOT need to match dataChannels.</param>
void tga_write(const char *filename, uint32_t width, uint32_t height, uint8_t *dataBGRA, uint8_t dataChannels=4, uint8_t fileChannels=3)
{
	FILE *fp = NULL;
	// MSVC prefers fopen_s, but it's not portable
	//fp = fopen(filename, "wb");
	fopen_s(&fp, filename, "wb");
	if (fp == NULL) return;

	// You can find details about TGA headers here: http://www.paulbourke.net/dataformats/tga/
	uint8_t header[18] = { 0,0,2,0,0,0,0,0,0,0,0,0, (uint8_t)(width%256), (uint8_t)(width/256), (uint8_t)(height%256), (uint8_t)(height/256), (uint8_t)(fileChannels*8), 0x20 };
	fwrite(&header, 18, 1, fp);

	for (uint32_t i = 0; i < width*height; i++)
	{
		for (uint32_t b = 0; b < fileChannels; b++)
		{
			fputc(dataBGRA[(i*dataChannels) + (b%dataChannels)], fp);
		}
	}
	fclose(fp);
}

牛皮.