stb_resample initial implementation

tests/resample_test.c

@@ -0,0 +1,49 @@
+#ifdef _WIN32
+#define STBR_ASSERT(x) \
+	if (!(x)) \
+		__debugbreak();
+#endif
+
+#define STB_RESAMPLE_IMPLEMENTATION
+#include "stb_resample.h"
+
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+#include "stb_image_write.h"
+
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+
+int main(int argc, char** argv)
+{
+	unsigned char* input_data;
+	unsigned char* output_data;
+	int w, h;
+	int n;
+	int out_w, out_h;
+
+	if (argc <= 1)
+	{
+		printf("No input image\n");
+		return 1;
+	}
+
+	input_data = stbi_load(argv[1], &w, &h, &n, 0);
+	if (!input_data)
+	{
+		printf("Input image could not be loaded");
+		return 1;
+	}
+
+	out_w = 512;
+	out_h = 512;
+
+	output_data = malloc(out_w * out_h * n);
+
+	stbr_resize(input_data, w, h, n, STBR_FILTER_NEAREST, output_data, out_w, out_h);
+
+	stbi_write_png("output.png", out_w, out_h, n, output_data, out_w * n);
+
+	free(output_data);
+
+	return 0;
+}