--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libmlk-core/core/painter.h	Sat Nov 28 22:37:30 2020 +0100
@@ -0,0 +1,150 @@
+/*
+ * painter.h -- basic drawing routines
+ *
+ * Copyright (c) 2020 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef MOLKO_CORE_PAINTER_H
+#define MOLKO_CORE_PAINTER_H
+
+/**
+ * \file painter.h
+ * \brief Basic drawing routines.
+ * \ingroup drawing
+ */
+
+#include <stdbool.h>
+
+struct texture;
+
+/**
+ * Give the current texture being used for rendering, maybe NULL if the
+ * rendering is on root.
+ *
+ * \return Texture or NULL.
+ */
+struct texture *
+painter_get_target(void);
+
+/**
+ * Set the rendering context to the given texture.
+ *
+ * Since this function change an internal global variable it is strongly
+ * encouraged to store a local backup of the current texture using \a
+ * painter_get_target and call this function with it afterwards.
+ *
+ * If texture is NULL, use default context aka the window.
+ *
+ * \param tex the texture
+ * \see \ref PAINTER_BEGIN
+ * \see \ref PAINTER_END
+ */
+void
+painter_set_target(struct texture *tex);
+
+/**
+ * Get the current drawing color.
+ *
+ * \return the color in RRGGBBAA format
+ */
+unsigned long
+painter_get_color(void);
+
+/**
+ * Set the rendering drawing color.
+ *
+ * \param color in RRGGBBAA format
+ */
+void
+painter_set_color(unsigned long color);
+
+/**
+ * Draw a line.
+ *
+ * \param x1 first X coordinate
+ * \param y1 first Y coordinate
+ * \param x2 second X coordinate
+ * \param y2 second Y coordinate
+ */
+void
+painter_draw_line(int x1, int y1, int x2, int y2);
+
+/**
+ * Draw a pixel point.
+ *
+ * \param x the X coordinate
+ * \param y the Y coordinate
+ */
+void
+painter_draw_point(int x, int y);
+
+/**
+ * Draw a rectangle
+ *
+ * \param x the X coordinate
+ * \param y the Y coordinate
+ * \param w the rectangle width
+ * \param h the rectangle height
+ */
+void
+painter_draw_rectangle(int x, int y, unsigned int w, unsigned int h);
+
+/**
+ * Draw a circle.
+ *
+ * \param x the X coordinate
+ * \param y the Y coordinate
+ * \param radius the radius size
+ */
+void
+painter_draw_circle(int x, int y, int radius);
+
+/**
+ * Clear the window.
+ */
+void
+painter_clear(void);
+
+/**
+ * Present the window, only call this function one time in the main loop.
+ */
+void
+painter_present(void);
+
+/**
+ * Use this macro to start painting on the texture to store the current
+ * rendering context and put it back afterwards.
+ *
+ * \pre tex != NULL
+ * \param tex the texture to use
+ * \see \ref PAINTER_END
+ */
+#define PAINTER_BEGIN(tex    )                                          \
+do {                                                                    \
+        struct texture *__current_texture__;                            \
+                                                                        \
+        __current_texture__ = painter_get_target();                     \
+        painter_set_target((tex))
+
+/**
+ * Use this macro at the end of rendering into a given texture.
+ *
+ * \see \ref PAINTER_BEGIN
+ */
+#define PAINTER_END()                                                   \
+        painter_set_target(__current_texture__);                        \
+} while (0)
+
+#endif /* !MOLKO_CORE_PAINTER_H */