launcher/src/client/available-feature-flags

@@ -53,3 +53,4 @@ TRUE 3D Chest Model
 TRUE Replace Block Highlight With Outline
 TRUE Use Java Beta 1.3 Light Ramp
 TRUE Send Full Level When Hosting Game
+FALSE Food Overlay

mods/src/misc/misc.c

@@ -3,6 +3,7 @@
 #include <unistd.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
+#include <math.h>
 
 #ifndef MCPI_HEADLESS_MODE
 #include <GLES/gl.h>
@@ -19,6 +20,60 @@
 #include "misc-internal.h"
 #include <mods/misc/misc.h>
 
+// Heart food overlay
+static int heal_amount = 0, heal_amount_drawing = 0;
+void Gui_renderHearts_injection(Gui *gui) {
+    // Get heal_amount
+    heal_amount = heal_amount_drawing = 0;
+
+    Inventory *inventory = gui->minecraft->player->inventory;
+    ItemInstance *held_ii = Inventory_getSelected(inventory);
+    if (held_ii) {
+        Item *held = Item_items[held_ii->id];
+        if (held->vtable->isFood(held) && held_ii->id) {
+            int nutrition = ((FoodItem *) held)->nutrition;
+            int cur_health = gui->minecraft->player->health;
+            int heal_num = fmin(cur_health + nutrition, 20) - cur_health;
+            heal_amount = heal_amount_drawing = heal_num;
+        }
+    }
+
+    // Call original
+    Gui_renderHearts(gui);
+}
+
+#define PINK_HEART_FULL 70
+#define PINK_HEART_HALF 79
+Gui_blit_t Gui_blit_renderHearts_original = NULL;
+void Gui_renderHearts_GuiComponent_blit_overlay_empty_injection(Gui *gui, int32_t x1, int32_t y1, int32_t x2, int32_t y2, int32_t w1, int32_t h1, int32_t w2, int32_t h2) {
+    // Call original
+    Gui_blit_renderHearts_original(gui, x1, y1, x2, y2, w1, h1, w2, h2);
+    // Render the overlay
+    if (heal_amount_drawing == 1) {
+        // Half heart
+        Gui_blit_renderHearts_original(gui, x1, y1, PINK_HEART_HALF, 0, w1, h1, w2, h2);
+        heal_amount_drawing = 0;
+    } else if (heal_amount_drawing > 0) {
+        // Full heart
+        Gui_blit_renderHearts_original(gui, x1, y1, PINK_HEART_FULL, 0, w1, h1, w2, h2);
+        heal_amount_drawing -= 2;
+    }
+}
+
+void Gui_renderHearts_GuiComponent_blit_overlay_hearts_injection(Gui *gui, int32_t x1, int32_t y1, int32_t x2, int32_t y2, int32_t w1, int32_t h1, int32_t w2, int32_t h2) {
+    // Offset the overlay
+    if (x2 == 52) {
+        heal_amount_drawing += 2;
+    } else if (x2 == 61 && heal_amount) {
+        // Half heart, flipped
+        Gui_blit_renderHearts_original(gui, x1, y1, PINK_HEART_FULL, 0, w1, h1, w2, h2);
+        heal_amount_drawing += 1;
+    };
+    // Call original
+    Gui_blit_renderHearts_original(gui, x1, y1, x2, y2, w1, h1, w2, h2);
+    heal_amount_drawing = fmin(heal_amount_drawing, heal_amount);
+}
+
 // Classic HUD
 #define DEFAULT_HUD_PADDING 2
 #define NEW_HUD_PADDING 1
@@ -568,14 +623,24 @@ void init_misc() {
         patch((void *) 0x63c98, invalid_item_background_patch);
     }
 
+
     // Classic HUD
+    Gui_blit_renderHearts_original = Gui_blit;
     if (feature_has("Classic HUD", server_disabled)) {
         use_classic_hud = 1;
-        overwrite_call((void *) 0x266f8, (void *) Gui_renderHearts_GuiComponent_blit_hearts_injection);
         overwrite_call((void *) 0x26758, (void *) Gui_renderHearts_GuiComponent_blit_hearts_injection);
-        overwrite_call((void *) 0x267c8, (void *) Gui_renderHearts_GuiComponent_blit_hearts_injection);
         overwrite_call((void *) 0x2656c, (void *) Gui_renderHearts_GuiComponent_blit_armor_injection);
         overwrite_call((void *) 0x268c4, (void *) Gui_renderBubbles_GuiComponent_blit_injection);
+        overwrite_call((void *) 0x266f8, (void *) Gui_renderHearts_GuiComponent_blit_hearts_injection);
+        overwrite_call((void *) 0x267c8, (void *) Gui_renderHearts_GuiComponent_blit_hearts_injection);
+        Gui_blit_renderHearts_original = Gui_renderHearts_GuiComponent_blit_hearts_injection;
+    }
+
+    // Food overlay
+    if (feature_has("Food Overlay", server_disabled)) {
+        overwrite_calls((void *) Gui_renderHearts, Gui_renderHearts_injection);
+        overwrite_call((void *) 0x266f8, (void *) Gui_renderHearts_GuiComponent_blit_overlay_empty_injection);
+        overwrite_call((void *) 0x267c8, (void *) Gui_renderHearts_GuiComponent_blit_overlay_hearts_injection);
     }
 
     // Render Selected Item Text + Hide Chat Messages

symbols/CMakeLists.txt

@@ -82,6 +82,7 @@ set(SRC
     src/item/AuxDataTileItem.def
     src/item/ItemInstance.def
     src/item/Item.def
+    src/item/FoodItem.def
     src/item/ArmorMaterial.def
     src/item/ArmorItem.def
     src/item/TileItem.def

symbols/src/gui/Gui.def

@@ -13,6 +13,7 @@ method void getSlotPos(int slot, int *x, int *y) = 0x25548;
 method void renderSlot(int slot, int x, int y, float alpha) = 0x25cc0;
 method void renderSlotText(ItemInstance *item, float x, float y, bool finite, bool shadow) = 0x25df8;
 method void handleKeyPressed(int key) = 0x25a08;
+method void renderHearts() = 0x2641c;
 
 property Minecraft *minecraft = 0x9f4;
 property float selected_item_text_timer = 0x9fc;

symbols/src/item/FoodItem.def

@@ -0,0 +1,7 @@
+extends Item;
+
+size 0x30;
+vtable 0x10e7b0;
+vtable-size 0x98;
+
+property int nutrition = 0x24;

symbols/src/item/Item.def

@@ -10,6 +10,7 @@ virtual-method void setIcon(int texture_x, int texture_y) = 0x18;
 virtual-method int getIcon(int auxiliary) = 0x14;
 virtual-method int useOn(ItemInstance *item_instance, Player *player, Level *level, int x, int y, int z, int hit_side, float hit_x, float hit_y, float hit_z) = 0x20;
 virtual-method ItemInstance *use(ItemInstance *item_instance, Level *level, Player *player) = 0x30;
+virtual-method bool isFood() = 0x64;
 virtual-method void setDescriptionId(std::string *name) = 0x6c;
 virtual-method std::string getDescriptionId(ItemInstance *item_instance) = 0x7c;