Add 'sdk/' from commit '2e7561d74f75de05dd7fb362f203f600afb451d7'

git-subtree-dir: sdk
git-subtree-mainline: 17a972d46f
git-subtree-split: 2e7561d74f

sdk/meow_ui_global.c

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+/*
+ * meow_ui_global.c — App 跨 Activity 控件（§6.1 ②，SDK 托管骨架）。
+ *
+ * SDK 维护一个全局控件列表（钉在 App 的 Activity 栈之上、跨 Activity 常驻）：
+ *   - 渲染：meow_ui_gfx present() 每帧在 active activity 内容之上、全局状态栏之下调
+ *     meow_ui_global_render()（遍历列表调 render_cb）;
+ *   - 触摸：meow_ui_input TAP 分发先给 meow_ui_global_hit(x,y)——命中返回 1=消费，
+ *     否则落到 active activity 页面控件（①）。
+ *
+ * 骨架（待 B2 细化）：无 z 序细分/无按压态管理/无命中区排布——App 的 render/hit 回调
+ * 自行决定绘制与命中。跨 Activity 常驻由「列表不随 Activity 栈变化」天然保证。
+ */
+#include "meow_ui.h"
+
+#define MEOW_GLOBAL_MAX 16
+
+typedef struct {
+    int     id;
+    meow_global_render_fn render;
+    meow_global_hit_fn    hit;
+    void   *ctx;
+} gentry;
+
+static gentry g_globals[MEOW_GLOBAL_MAX];
+static int    g_global_n = 0;
+
+void meow_ui_global_add(int id, meow_global_render_fn r, meow_global_hit_fn h, void *ctx)
+{
+    for (int i = 0; i < g_global_n; i++)
+        if (g_globals[i].id == id) return;   /* 同 id 幂等（重复 add 不新增，骨架） */
+    if (g_global_n >= MEOW_GLOBAL_MAX) return;
+    g_globals[g_global_n].id = id;
+    g_globals[g_global_n].render = r;
+    g_globals[g_global_n].hit = h;
+    g_globals[g_global_n].ctx = ctx;
+    g_global_n++;
+}
+
+void meow_ui_global_remove(int id)
+{
+    for (int i = 0; i < g_global_n; i++) {
+        if (g_globals[i].id == id) {
+            g_globals[i] = g_globals[--g_global_n];
+            return;
+        }
+    }
+}
+
+void meow_ui_global_render(void)
+{
+    for (int i = 0; i < g_global_n; i++)
+        if (g_globals[i].render) g_globals[i].render(g_globals[i].ctx);
+}
+
+int meow_ui_global_hit(int x, int y)
+{
+    for (int i = 0; i < g_global_n; i++)
+        if (g_globals[i].hit && g_globals[i].hit(g_globals[i].ctx, x, y))
+            return 1;
+    return 0;
+}