ported rewrite2 to c3

src/ugui_data.c3

@@ -0,0 +1,184 @@
+module ugui;
+
+import vtree;
+import cache;
+import fifo;
+
+struct Rect {
+	short x, y, w, h;
+}
+
+struct Point {
+	short x, y;
+}
+
+struct Color{
+	char r, g, b, a;
+}
+
+// element ids are just long ints
+def Id = usz;
+
+enum ElemType {
+	ETYPE_NONE,
+	ETYPE_DIV,
+	ETYPE_BUTTON,
+}
+
+bitstruct ElemFlags : uint {
+	bool updated : 0;
+	bool has_focus : 1;
+}
+
+bitstruct ElemEvents : uint {
+	bool key_press     : 0;
+	bool key_release   : 1;
+	bool key_hold      : 2;
+	bool mouse_hover   : 3;
+	bool mouse_press   : 4;
+	bool mouse_release : 5;
+	bool mouse_hold    : 6;
+}
+
+enum DivLayout {
+	LAYOUT_ROW,
+	LAYOUT_COLUMN,
+	LAYOUT_FLOATING,
+}
+
+// div element
+struct Div {
+	DivLayout layout;
+	Point origin_r, origin_c;
+	Color color_bg;
+}
+
+// element structure
+struct Elem {
+	Id id;
+	ElemFlags flags;
+	ElemEvents events;
+	Rect rect;
+	ElemType type;
+	union {
+		Div div;
+	}
+}
+
+
+// relationships between elements are stored in a tree, it stores just the ids
+def IdTree = vtree::VTree(<Id>) @private;
+
+// elements themselves are kept in a cache
+const uint MAX_ELEMENTS = 2048;
+def ElemCache = cache::Cache(<Id, Elem, MAX_ELEMENTS>) @private;
+
+def CmdQueue = fifo::Fifo(<Cmd>);
+
+fault UgError {
+	INVALID_SIZE,
+	EVENT_UNSUPPORTED,
+	UNEXPECTED_ELEMENT,
+}
+
+fn Id fnv1a(String str)
+{
+	const ulong FNV_OFF   = 0xcbf29ce484222325;
+	const ulong FNV_PRIME = 0x100000001b3;
+
+	ulong hash = FNV_OFF;
+	foreach (c : str) {
+		hash ^= c;
+		hash *= FNV_PRIME;
+	}
+
+	return hash;
+}
+
+macro hash(String str) { return fnv1a(str); }
+
+macro uint_to_rgba(uint u) {
+	return Color{
+		.r = (char)((u >> 24) & 0xff),
+		.g = (char)((u >> 16) & 0xff),
+		.b = (char)((u >> 8) & 0xff),
+		.a = (char)((u >> 0) & 0xff)
+	};
+}
+
+const Rect DIV_FILL = { .x = 0, .y = 0, .w = 0, .h = 0 };
+
+macro abs(a) { return a < 0 ? -a : a; }
+macro clamp(x, min, max) { return x < min ? min : (x > max ? max : x); }
+
+const uint STACK_STEP = 10;
+const uint MAX_ELEMS  = 128;
+const uint MAX_CMDS   = 256;
+const uint ROOT_ID    = 1;
+
+// command type
+enum CmdType {
+	CMD_RECT,
+}
+
+// command to draw a rect
+struct CmdRect {
+	Rect rect;
+	Color color;
+}
+
+// command structure
+struct Cmd {
+	CmdType type;
+	union {
+		CmdRect rect;
+	}
+}
+
+enum Layout {
+	ROW,
+	COLUMN,
+	FLOATING
+}
+
+// global style, similar to the css box model
+struct Style { // css box model
+	Rect  padding;
+	Rect  border;
+	Rect  margin;
+	Color bgcolor; // background color
+	Color fgcolor; // foreground color
+	Color bcolor;  // border color
+}
+
+
+struct Ctx {
+	Layout layout;
+	IdTree tree;
+	ElemCache cache;
+	CmdQueue cmd_queue;
+	// total size in pixels of the context
+	ushort width, height;
+	Style style;
+
+	bool has_focus;
+	struct input {
+		InputEvents events;
+		struct mouse {
+			Point pos, delta;
+			// mouse_down:      bitmap of mouse buttons that are held
+			// mouse_updated:   bitmap of mouse buttons that have been updated
+			// mouse_released = mouse_updated & ~mouse_down
+			// mouse_pressed  = mouse_updated & mouse_down
+			MouseButtons down;
+			MouseButtons updated;
+		}
+	}
+
+	isz active_div; // tree node indicating the current active div
+}
+
+macro point_in_rect(Point p, Rect r)
+{
+	return (p.x >= r.x && p.x <= r.x + r.w) && (p.y >= r.y && p.y <= r.y + r.h);
+}