vs solution, animations, some warnings fixed

include/compositor.h

@@ -0,0 +1,101 @@
+// compositor.h
+#ifndef COMPOSITOR_H
+#define COMPOSITOR_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+// Animation types
+enum animation_type_t {
+    ANIM_NONE = 0,
+    ANIM_MOVE,
+    ANIM_FADE,
+    ANIM_SCALE,
+    ANIM_MOVE_FADE // Combined animation
+};
+
+// Easing functions
+enum easing_t {
+    EASE_LINEAR = 0,
+    EASE_IN_QUAD,
+    EASE_OUT_QUAD,
+    EASE_IN_OUT_QUAD,
+    EASE_IN_CUBIC,
+    EASE_OUT_CUBIC,
+    EASE_IN_OUT_CUBIC
+};
+
+extern "C" {
+
+typedef struct compositor_t compositor_t;
+
+// Initialize compositor with given dimensions
+compositor_t* compositor_init(uint32_t width, uint32_t height);
+
+// Destroy compositor and free resources
+void compositor_destroy(compositor_t* comp);
+
+// Insert element, returns unique ID
+uint32_t compositor_insert(compositor_t* comp,
+                          const uint32_t* fb,
+                          uint32_t fb_width,
+                          uint32_t fb_height,
+                          int32_t x, int32_t y,
+                          int32_t z_order, float scale = 1.0f);
+
+// Remove element by ID
+void compositor_remove(compositor_t* comp, uint32_t id);
+
+// AIO Update element properties
+void compositor_update(compositor_t* comp, uint32_t id,
+                      int32_t x, int32_t y,
+                      int32_t z_order, float scale,
+                      bool visible); // holy clusterfuck
+
+// Individual setters
+void compositor_set_position(compositor_t* comp, uint32_t id,
+                             int32_t x, int32_t y);
+
+void compositor_set_zorder(compositor_t* comp, uint32_t id,
+                           int32_t z_order);
+
+void compositor_set_visible(compositor_t* comp, uint32_t id,
+                             bool visible);
+
+void compositor_set_scale(compositor_t* comp, uint32_t id,
+                           float scale);
+
+// Advances all animations by a given time delta.
+void compositor_tick(compositor_t* comp, float delta_time_sec);
+
+// Instantly sets the element-wide alpha.
+void compositor_set_alpha(compositor_t* comp, uint32_t id, float alpha);
+
+// Starts a "slide" animation on an element.
+void compositor_animate_move(compositor_t* comp, uint32_t id,
+    int32_t to_x, int32_t to_y,
+    float duration_sec, easing_t easing);
+
+// Starts a "fade" or "dissolve" animation on an element.
+void compositor_animate_fade(compositor_t* comp, uint32_t id,
+    float to_alpha,
+    float duration_sec, easing_t easing);
+
+// Starts a "scale" animation on an element.
+void compositor_animate_scale(compositor_t* comp, uint32_t id,
+    float to_scale,
+    float duration_sec, easing_t easing);
+
+// Compose all visible elements and return framebuffer pointer
+const uint32_t* compositor_compose(compositor_t* comp);
+
+void compositor_mark_content_dirty(compositor_t* comp, uint32_t id);
+void compositor_mark_all_dirty(compositor_t* comp);
+
+// Returns the last error message set for this compositor instance.
+// Returns nullptr if no error has occurred.
+const char* compositor_get_last_error(compositor_t* comp);
+
+}
+
+#endif // COMPOSITOR_H