1 files changed, 75 insertions, 0 deletions
diff --git a/src/unk_pokedex_area_screen_helper.c b/src/unk_pokedex_area_screen_helper.c
new file mode 100644
index 000000000..521af6dd9
--- /dev/null
+++ b/src/unk_pokedex_area_screen_helper.c
@@ -0,0 +1,75 @@
+#include "global.h"
+#include "main.h"
+#include "menu.h"
+#include "bg.h"
+#include "malloc.h"
+#include "palette.h"
+
+EWRAM_DATA u8 *gUnknown_0203CF28 = NULL;
+
+static const u16 gUnknown_0861D140[] = INCBIN_U16("graphics/interface/region_map.gbapal");
+static const u8 gUnknown_0861D1A0[] = INCBIN_U8("graphics/interface/region_map.8bpp.lz");
+static const u8 gUnknown_0861DEF4[] = INCBIN_U8("graphics/interface/region_map.bin.lz");
+static const u8 gUnknown_0861E208[] = INCBIN_U8("graphics/interface/region_map_affine.8bpp.lz");
+static const u8 gUnknown_0861EF64[] = INCBIN_U8("graphics/interface/region_map_affine.bin.lz");
+
+struct UnkStruct_1C4D70
+{
+    u32 bg:2;
+    u32 unk2:8;
+    u32 unk10:2;
+    u32 unk12:20;
+};
+
+void sub_81C4D70(struct UnkStruct_1C4D70 *template)
+{
+    u8 unk;
+    gUnknown_0203CF28 = Alloc(4);
+    unk = template->unk10;
+
+    if (unk == 0)
+    {
+        SetBgAttribute(template->bg, BG_CTRL_ATTR_WRAPAROUND, 0);
+        decompress_and_copy_tile_data_to_vram(template->bg, gUnknown_0861D1A0, 0, template->unk2, unk);
+        sub_8199D3C(decompress_and_copy_tile_data_to_vram(template->bg, gUnknown_0861DEF4, 0, 0, 1), template->unk2, 32, 32, unk);
+    }
+    else
+    {
+        SetBgAttribute(template->bg, BG_CTRL_ATTR_WRAPAROUND, 2);
+        SetBgAttribute(template->bg, 9, 1);
+        decompress_and_copy_tile_data_to_vram(template->bg, gUnknown_0861E208, 0, template->unk2, 0);
+        sub_8199D3C(decompress_and_copy_tile_data_to_vram(template->bg, gUnknown_0861EF64, 0, 0, 1), template->unk2, 64, 64, 1);
+    }
+
+    ChangeBgX(template->bg, 0, 0);
+    ChangeBgY(template->bg, 0, 0);
+    SetBgAttribute(template->bg, BG_CTRL_ATTR_SCREENSIZE, 1);
+    CpuCopy32(gUnknown_0861D140, &gPlttBufferUnfaded[0x70], 0x60);
+    *gUnknown_0203CF28 = template->bg;
+}
+
+bool32 sub_81C4E90(void)
+{
+    if (!free_temp_tile_data_buffers_if_possible())
+    {
+        ShowBg(*gUnknown_0203CF28);
+        return FALSE;
+    }
+    else
+    {
+        return TRUE;
+    }
+}
+
+void sub_81C4EB4(void)
+{
+    if (gUnknown_0203CF28 != NULL)
+    {
+        FREE_AND_SET_NULL(gUnknown_0203CF28);
+    }
+}
+
+void sub_81C4ED0(u32 a0)
+{
+    ChangeBgY(*gUnknown_0203CF28, a0 * 0x100, 0);
+}