2 files changed, 173 insertions, 4 deletions
diff --git a/src/decoration.c b/src/decoration.c
index 68a455285..68dcb26fb 100644
--- a/src/decoration.c
+++ b/src/decoration.c
@@ -2013,9 +2013,9 @@ u8 AddDecorationIconObjectFromIconTable(u16 tilesTag, u16 paletteTag, u8 decor)
     {
         return MAX_SPRITES;
     }
-    LZDecompressWram(GetDecorationIconPicOrPalette(decor, 0), gUnknown_0203CEBC);
-    CopyItemIconPicTo4x4Buffer(gUnknown_0203CEBC, gUnknown_0203CEC0);
-    sheet.data = gUnknown_0203CEC0;
+    LZDecompressWram(GetDecorationIconPicOrPalette(decor, 0), gItemIconDecompressionBuffer);
+    CopyItemIconPicTo4x4Buffer(gItemIconDecompressionBuffer, gItemIcon4x4Buffer);
+    sheet.data = gItemIcon4x4Buffer;
     sheet.size = 0x200;
     sheet.tag = tilesTag;
     LoadSpriteSheet(&sheet);
@@ -2023,7 +2023,7 @@ u8 AddDecorationIconObjectFromIconTable(u16 tilesTag, u16 paletteTag, u8 decor)
     palette.tag = paletteTag;
     LoadCompressedObjectPalette(&palette);
     template = malloc(sizeof(struct SpriteTemplate));
-    *template = gUnknown_08614FF4;
+    *template = gItemIconSpriteTemplate;
     template->tileTag = tilesTag;
     template->paletteTag = paletteTag;
     spriteId = CreateSprite(template, 0, 0, 0);
diff --git a/src/item_icon.c b/src/item_icon.c
new file mode 100644
index 000000000..4aaad9c31
--- /dev/null
+++ b/src/item_icon.c
@@ -0,0 +1,169 @@
+#include "global.h"
+#include "item_icon.h"
+#include "malloc.h"
+#include "sprite.h"
+#include "decompress.h"
+#include "constants/items.h"
+
+// EWRAM vars
+EWRAM_DATA void *gItemIconDecompressionBuffer = NULL;
+EWRAM_DATA void *gItemIcon4x4Buffer = NULL;
+
+// const rom data
+extern const void *const gItemIconTable[][2]; // todo: move to C file
+
+static const struct OamData sOamData_ItemIcon =
+{
+    .y = 0,
+    .affineMode = 0,
+    .objMode = 0,
+    .mosaic = 0,
+    .bpp = 0,
+    .shape = 0,
+    .x = 0,
+    .matrixNum = 0,
+    .size = 2,
+    .tileNum = 0,
+    .priority = 1,
+    .paletteNum = 2,
+    .affineParam = 0
+};
+
+static const union AnimCmd sSpriteAnim_ItemIcon[] =
+{
+    ANIMCMD_FRAME(0, 0),
+    ANIMCMD_END
+};
+
+static const union AnimCmd *const sSpriteAnimTable_ItemIcon[] =
+{
+    sSpriteAnim_ItemIcon
+};
+
+const struct SpriteTemplate gItemIconSpriteTemplate =
+{
+    .tileTag = 0,
+    .paletteTag = 0,
+    .oam = &sOamData_ItemIcon,
+    .anims = sSpriteAnimTable_ItemIcon,
+    .images = NULL,
+    .affineAnims = gDummySpriteAffineAnimTable,
+    .callback = SpriteCallbackDummy,
+};
+
+// code
+bool8 AllocItemIconTemporaryBuffers(void)
+{
+    gItemIconDecompressionBuffer = gItemIconDecompressionBuffer; // needed to match
+    gItemIconDecompressionBuffer = Alloc(0x120);
+    if (gItemIconDecompressionBuffer == NULL)
+        return FALSE;
+
+    gItemIcon4x4Buffer = gItemIcon4x4Buffer; // needed to match
+    gItemIcon4x4Buffer = AllocZeroed(0x200);
+    if (gItemIcon4x4Buffer == NULL)
+    {
+        Free(gItemIconDecompressionBuffer);
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+void FreeItemIconTemporaryBuffers(void)
+{
+    Free(gItemIconDecompressionBuffer);
+    Free(gItemIcon4x4Buffer);
+}
+
+void CopyItemIconPicTo4x4Buffer(const void *src, void *dest)
+{
+    u8 i;
+
+    for (i = 0; i < 3; i++)
+        CpuCopy16(src + i * 96, dest + i * 128, 0x60);
+}
+
+u8 AddItemIconSprite(u16 tilesTag, u16 paletteTag, u16 itemId)
+{
+    if (!AllocItemIconTemporaryBuffers())
+    {
+        return MAX_SPRITES;
+    }
+    else
+    {
+        u8 spriteId;
+        struct SpriteSheet spriteSheet;
+        struct CompressedSpritePalette spritePalette;
+        struct SpriteTemplate *spriteTemplate;
+
+        LZDecompressWram(GetItemIconPicOrPalette(itemId, 0), gItemIconDecompressionBuffer);
+        CopyItemIconPicTo4x4Buffer(gItemIconDecompressionBuffer, gItemIcon4x4Buffer);
+        spriteSheet.data = gItemIcon4x4Buffer;
+        spriteSheet.size = 0x200;
+        spriteSheet.tag = tilesTag;
+        LoadSpriteSheet(&spriteSheet);
+
+        spritePalette.data = GetItemIconPicOrPalette(itemId, 1);
+        spritePalette.tag = paletteTag;
+        LoadCompressedObjectPalette(&spritePalette);
+
+        spriteTemplate = Alloc(sizeof(*spriteTemplate));
+        CpuCopy16(&gItemIconSpriteTemplate, spriteTemplate, sizeof(*spriteTemplate));
+        spriteTemplate->tileTag = tilesTag;
+        spriteTemplate->paletteTag = paletteTag;
+        spriteId = CreateSprite(spriteTemplate, 0, 0, 0);
+
+        FreeItemIconTemporaryBuffers();
+        Free(spriteTemplate);
+
+        return spriteId;
+    }
+}
+
+u8 AddCustomItemIconSprite(struct SpriteTemplate *customSpriteTemplate, u16 tilesTag, u16 paletteTag, u16 itemId)
+{
+    if (!AllocItemIconTemporaryBuffers())
+    {
+        return MAX_SPRITES;
+    }
+    else
+    {
+        u8 spriteId;
+        struct SpriteSheet spriteSheet;
+        struct CompressedSpritePalette spritePalette;
+        struct SpriteTemplate *spriteTemplate;
+
+        LZDecompressWram(GetItemIconPicOrPalette(itemId, 0), gItemIconDecompressionBuffer);
+        CopyItemIconPicTo4x4Buffer(gItemIconDecompressionBuffer, gItemIcon4x4Buffer);
+        spriteSheet.data = gItemIcon4x4Buffer;
+        spriteSheet.size = 0x200;
+        spriteSheet.tag = tilesTag;
+        LoadSpriteSheet(&spriteSheet);
+
+        spritePalette.data = GetItemIconPicOrPalette(itemId, 1);
+        spritePalette.tag = paletteTag;
+        LoadCompressedObjectPalette(&spritePalette);
+
+        spriteTemplate = Alloc(sizeof(*spriteTemplate));
+        CpuCopy16(customSpriteTemplate, spriteTemplate, sizeof(*spriteTemplate));
+        spriteTemplate->tileTag = tilesTag;
+        spriteTemplate->paletteTag = paletteTag;
+        spriteId = CreateSprite(spriteTemplate, 0, 0, 0);
+
+        FreeItemIconTemporaryBuffers();
+        Free(spriteTemplate);
+
+        return spriteId;
+    }
+}
+
+const void *GetItemIconPicOrPalette(u16 itemId, u8 which)
+{
+    if (itemId == 0xFFFF)
+        itemId = ITEM_FIELD_ARROW;
+    else if (itemId > ITEM_LAST_ID)
+        itemId = 0;
+
+    return gItemIconTable[itemId][which];
+}