1 files changed, 83 insertions, 0 deletions
diff --git a/src/tools/tileset_borderfix.c b/src/tools/tileset_borderfix.c
new file mode 100644
index 00000000..ba7a40f0
--- /dev/null
+++ b/src/tools/tileset_borderfix.c
@@ -0,0 +1,83 @@
+
+#include "../engine/client/pnglite/pnglite.c"
+
+typedef struct pixel_t
+{
+	unsigned char r, g, b, a;
+} pixel;
+
+static pixel sample(int x, int y, int w, int h, pixel *data, int pitch, float u, float v)
+{
+	x = x + (int)(w*u);
+	y = y + (int)(h*v);
+	return data[y*pitch+x];
+}
+
+static void tilemap_borderfix(int w, int h, pixel *src, pixel *dst)
+{
+	int tilew = w/16;
+	int tileh = h/16;
+	int tx, ty;
+	int x, y;
+	int k;
+	float u, v;
+	
+	memset(dst, 0, sizeof(pixel)*w*h);
+				
+	for(ty = 0; ty < 16; ty++)
+		for(tx = 0; tx < 16; tx++)
+		{
+			for(y = 0; y < tileh-2; y++)
+				for(x = 0; x < tilew-2; x++)
+				{
+					u = 0.5f/tilew + x/(float)(tilew-2);
+					v = 0.5f/tileh + y/(float)(tileh-2);
+					k = (ty*tileh+1+y)*w + tx*tilew+x+1;
+					dst[k] = sample(tx*tilew, ty*tileh, tilew, tileh, src, w, u, v);
+					
+					if(x == 0) dst[k-1] = dst[k];
+					if(x == tilew-2-1) dst[k+1] = dst[k];
+					if(y == 0) dst[k-w] = dst[k];
+					if(y == tileh-2-1) dst[k+w] = dst[k];
+					
+					if(x == 0 && y == 0) dst[k-w-1] = dst[k];
+					if(x == tilew-2-1 && y == 0) dst[k-w+1] = dst[k];
+					if(x == 0 && y == tileh-2-1) dst[k+w-1] = dst[k];
+					if(x == tilew-2-1 && y == tileh-2-1) dst[k+w+1] = dst[k];
+				}
+		}
+}
+
+
+int main(int argc, char **argv)
+{
+	png_t png;
+	pixel *buffer[2] = {0,0};
+	int w, h;
+	
+	png_init(0,0);
+	png_open_file(&png, argv[1]);
+	
+	if(png.color_type != PNG_TRUECOLOR_ALPHA)
+	{
+		printf("not an RGBA image\n");
+		return -1;
+	}
+	
+	w = png.width;
+	h = png.height;
+	
+	buffer[0] = (pixel*)malloc(w*h*sizeof(pixel));
+	buffer[1] = (pixel*)malloc(w*h*sizeof(pixel));
+	png_get_data(&png, (unsigned char *)buffer[0]);
+	png_close_file(&png);
+	
+	tilemap_borderfix(w, h, buffer[0], buffer[1]);
+	
+	// save here
+	png_open_file_write(&png, "output.png");
+	png_set_data(&png, w, h, 8, PNG_TRUECOLOR_ALPHA, (unsigned char *)buffer[1]);
+	png_close_file(&png);
+		
+	return 0;
+}