V1.61 feature update: JPEG image viewer and JPEG wallpaper setting.

src/kernel/wallpaper.h

@@ -0,0 +1,35 @@
+// wallpaper.h - Wallpaper management for BoredOS
+#ifndef WALLPAPER_H
+#define WALLPAPER_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+// Initialize wallpaper subsystem (creates /Wallpapers dir, writes JPEGs, pre-generates thumbnails)
+void wallpaper_init(void);
+
+// Request wallpaper change by embedded index (safe from interrupt context)
+void wallpaper_request_set(int index);
+
+// Request wallpaper change by file path (safe from interrupt context)
+void wallpaper_request_set_from_file(const char *path);
+
+// Process pending wallpaper actions (call from main loop only!)
+void wallpaper_process_pending(void);
+
+// Get pre-generated thumbnail pixel buffer (index 0=moon, 1=mountain)
+#define WALLPAPER_THUMB_W 100
+#define WALLPAPER_THUMB_H 60
+uint32_t* wallpaper_get_thumb(int index);
+bool wallpaper_thumb_valid(int index);
+
+// Wallpaper info
+#define WALLPAPER_COUNT 2
+extern const char *wallpaper_names[WALLPAPER_COUNT];
+
+// Get decoded wallpaper pixel buffer
+uint32_t* wallpaper_get_pixels(void);
+int wallpaper_get_width(void);
+int wallpaper_get_height(void);
+
+#endif // WALLPAPER_H