Block-style cf_draw

cute_macros.h

#pragma once

#define _CF_CONCAT(a, b) a##b
#define _CF_VAR(line)    _CF_CONCAT(_cf_guard_, line)

/**
 * @brief Scoped drawing context macro
 *
 * @details Creates a scoped block that automatically calls cf_draw_push() on
 * entry and cf_draw_pop() on exit. This ensures proper pairing of push/pop
 * calls even in the presence of early returns or exceptions.
 *
 * The macro uses a for-loop trick to achieve RAII-like behavior:
 * - cf_draw_push() is called before the loop body executes
 * - Loop body runs exactly once
 * - cf_draw_pop() is called when exiting the scope
 *
 * @note Uses __LINE__ to generate unique variable names, preventing collisions
 * @warning Cannot be used multiple times on the same line (generates same
 * variable name)
 * @note Safe for nested usage across different lines
 *
 * @code
 * void render() {
 *     cf_draw() {
 *         draw_rectangle(0, 0, 100, 100);
 *         draw_circle(50, 50, 25);
 *     }
 * }
 *
 * void complex_render() {
 *     cf_draw() {
 *         set_color(RED);
 *         draw_background();
 *
 *         cf_draw() {
 *             set_color(BLUE);
 *             draw_overlay();
 *         }
 *
 *         draw_border();
 *     }
 * }
 * @endcode
 */
#define cf_draw()                                                         \
    for (auto _CF_VAR(__LINE__) = (cf_draw_push(), 1); _CF_VAR(__LINE__); \
         _CF_VAR(__LINE__)      = 0, cf_draw_pop())