Canvas implementation and add build of LodePNG

source/include/canvas.h

@@ -0,0 +1,32 @@
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Canvas header
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+#ifndef DORAYME_CANVAS_H
+#define DORAYME_CANVAS_H
+
+#include <stdint.h>
+#include <colour.h>
+
+class Canvas
+{
+private:
+    uint8_t *bitmap;
+    uint32_t stride;
+public:
+    uint32_t width, height;
+
+    Canvas(uint32_t width, uint32_t height);
+    ~Canvas();
+
+    void put_pixel(uint32_t x, uint32_t y, Colour c);
+    Colour get_pixel(uint32_t x, uint32_t y);
+
+    bool SaveAsPNG(const char *filename);
+};
+
+#endif /* DORAYME_CANVAS_H */