Initial

qoiconv.c

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+/*
+
+Command line tool to convert between png <> qoi format
+
+Requires "stb_image.h" and "stb_image_write.h"
+Compile with: 
+	gcc qoiconv.c -std=c99 -O3 -o qoiconv
+
+Dominic Szablewski - https://phoboslab.org
+
+
+-- LICENSE: The MIT License(MIT)
+
+Copyright(c) 2021 Dominic Szablewski
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files(the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and / or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions :
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+*/
+
+
+#define STB_IMAGE_IMPLEMENTATION
+#define STBI_ONLY_PNG
+#define STBI_NO_LINEAR
+#include "stb_image.h"
+
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+#include "stb_image_write.h"
+
+#define QOI_IMPLEMENTATION
+#include "qoi.h"
+
+
+#define STR_ENDS_WITH(S, E) (strcmp(S + strlen(S) - (sizeof(E)-1), E) == 0)
+
+int main(int argc, char **argv) {
+	if (argc < 3) {
+		printf("Usage: qoiconv infile outfile\n");
+		printf("Examples:\n");
+		printf("  qoiconv image.png image.qoi\n");
+		printf("  qoiconv image.qoi image.png\n");
+		exit(1);
+	}
+
+	void *pixels = NULL;
+	int w, h;
+	if (STR_ENDS_WITH(argv[1], ".png")) {
+		pixels = (void *)stbi_load(argv[1], &w, &h, NULL, 4);
+	}
+	else if (STR_ENDS_WITH(argv[1], ".qoi")) {
+		pixels = qoi_read(argv[1], &w, &h, 4);
+	}
+
+	if (pixels == NULL) {
+		printf("Couldn't load/decode %s\n", argv[1]);
+		exit(1);
+	}
+
+	int encoded = 0;
+	if (STR_ENDS_WITH(argv[2], ".png")) {
+		encoded = stbi_write_png(argv[2], w, h, 4, pixels, 0);
+	}
+	else if (STR_ENDS_WITH(argv[2], ".qoi")) {
+		encoded = qoi_write(argv[2], pixels, w, h, 4);
+	}
+
+	if (!encoded) {
+		printf("Couldn't write/encode %s\n", argv[2]);
+		exit(1);
+	}
+
+	return 0;
+}