Optimize boxart image load (#130)

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## Description
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Improves boxart image loading by using directory file paths.
It also adds matching by full game ID's (for compatibility), but notes
in the readme that it is slow.

## Motivation and Context
<!--- What does this sample do? What problem does it solve? -->
<!--- If it fixes/closes/resolves an open issue, please link to the
issue here -->
Loading boxart was slow in certain circumstances.

## How Has This Been Tested?
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to -->
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Locally on an SC64.

## Screenshots
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## Types of changes
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the boxes that apply: -->
- [x] Improvement (non-breaking change that adds a new feature)
- [ ] Bug fix (fixes an issue)
- [ ] Breaking change (breaking change)
- [ ] Documentation Improvement
- [ ] Config and build (change in the configuration and build system,
has no impact on code or features)

## Checklist:
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that apply. -->
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- [ ] My code follows the code style of this project.
- [ ] My change requires a change to the documentation.
- [ ] I have updated the documentation accordingly.
- [ ] I have added tests to cover my changes.
- [ ] All new and existing tests passed.

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Signed-off-by: GITHUB_USER <GITHUB_USER_EMAIL>


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit


- **New Features**
- Introduced a new image type enumeration for boxart components,
enhancing image management.
- Updated boxart initialization to allow for specific image views,
improving flexibility in image retrieval.
- Enhanced instructions for setting up boxart images with clearer
directory structures and simplified naming conventions.

- **Bug Fixes**
- Improved the logic for loading boxart images, enabling better fallback
options in case of missing files.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

README.md

@@ -49,22 +49,44 @@ An open source menu for N64 flashcarts.
 ## Experimental features
 These features are subject to change:
 
-### ROM Boxart
-To use boxart, place PNG files in the `/menu/boxart` folder on the SD card with the following dimensions:
-* Standard covers: 158x112
-* 64DD covers: 129x112
-* Japanese covers: 112x158
 
-Each file must be named according to the 2 letter ROM ID, or 3 letter ROM ID including media type.
-i.e. for GoldenEye 2 letters, this would be `GE.png`.
-i.e. for GoldenEye 3 letters, this would be `NGE.png`.
-You can download these boxart packs:
+### GamePak sprites
+To use N64 `GamePak` sprites, place `PNG` files within the `sd:/menu/boxart/` folder.
 
-[American Boxart](https://mega.nz/file/6cNGwSqI#8X5ukb65n3YMlGaUtSOGXkKo9HxVnnMOgqn94Epcr7w)
 
-[European Boxart](https://mega.nz/file/O7AjDbRJ#VnVU10dq8HQvBUQptppI6PAcQMb8-Zembqav8WtAQ_M)
+#### Supported sprites
+These must be `PNG` files that use the following dimensions:
+* Standard N64 GamePak boxart sprites: 158x112
+* Japanese N64 GamePak boxart sprites: 112x158
+* 64DD boxart sprites: 129x112
 
-[64DD Boxart](https://mega.nz/file/O3JzwD7B#BYl1aV-pbrJ-MxWUbM_K0yGVIRbmSoxJJZqQInRzZyM)
+They will be loaded by directories using each character of the full 4 character Game Code (as identified in the menus ROM information).
+i.e. for GoldenEye NTSC USA (NGEE), this would be `sd:/menu/boxart/N/G/E/E/boxart_front.png`.
+i.e. for GoldenEye PAL (NGEP), this would be `sd:/menu/boxart/N/G/E/P/boxart_front.png`.
+
+To improve compatibility between regions (as a fallback), you may exclude the region ID (last matched directory) for GamePaks to match with 3 letter IDs instead:
+i.e. for GoldenEye, this would be `sd:/menu/boxart/N/G/E/boxart_front.png`.
+
+**Note1:** Excluding the region ID may show the wrong boxart.
+**Note2:** For future support, boxart sprites should also include: `boxart_back.png`, `boxart_top.png`, `boxart_bottom.png`, `boxart_left.png`, `boxart_right.png`.
+
+
+#### Compatibilty mode
+If you cannot yet satisfy the correct boxart layout, The menu still has **deprecated** support for filenames containing the Game ID.
+
+**Note:** This will add a noticeable delay for displaying parts of the menu.
+
+Each file must be named according to the 2,3 or 4 letter GamePak ID (matched in this order).
+i.e.
+* for GoldenEye 4 letters, this would be `sd:/menu/boxart/NGEE.png` and/or `sd:/menu/boxart/NGEP.png`.
+* for GoldenEye 3 letters, this would be `sd:/menu/boxart/NGE.png`.
+* for GoldenEye 2 letters, this would be `sd:/menu/boxart/GE.png`.
+
+
+As a starting point, here are some links to boxart packs:
+* [American GamePak Boxart](https://mega.nz/file/6cNGwSqI#8X5ukb65n3YMlGaUtSOGXkKo9HxVnnMOgqn94Epcr7w)
+* [European GamePak Boxart](https://mega.nz/file/O7AjDbRJ#VnVU10dq8HQvBUQptppI6PAcQMb8-Zembqav8WtAQ_M)
+* [64DD Boxart](https://mega.nz/file/O3JzwD7B#BYl1aV-pbrJ-MxWUbM_K0yGVIRbmSoxJJZqQInRzZyM)
 
 
 ### Menu Settings

src/menu/components.h

@@ -11,6 +11,41 @@
 #include <libdragon.h>
 #include "menu_state.h"
 
+/** @brief File image Enumeration. */
+typedef enum {
+
+    /** @brief Boxart image from the front */
+    IMAGE_BOXART_FRONT,
+
+    /** @brief Boxart image from the back */
+    IMAGE_BOXART_BACK,
+
+    /** @brief Boxart image from the top */
+    IMAGE_BOXART_TOP,
+
+    /** @brief Boxart image from the bottom */
+    IMAGE_BOXART_BOTTOM,
+
+    /** @brief Boxart image from the left side */
+    IMAGE_BOXART_LEFT,
+
+    /** @brief Boxart image from the right side */
+    IMAGE_BOXART_RIGHT,
+
+    /** @brief GamePak image from the front */
+    IMAGE_GAMEPAK_FRONT,
+
+    /** @brief GamePak image from the back */
+    IMAGE_GAMEPAK_BACK,
+
+    /** @brief File image thumbnail */
+    IMAGE_THUMBNAIL,
+
+    /** @brief List end marker */
+    IMAGE_TYPE_END
+
+} file_image_type_t;
+
 
 /**
  * @addtogroup 
@@ -64,7 +99,7 @@ typedef struct {
     surface_t *image;
 } component_boxart_t;
 
-component_boxart_t *component_boxart_init (const char *storage_prefix, char *game_code);
+component_boxart_t *component_boxart_init (const char *storage_prefix, char *game_code, file_image_type_t current_image_view);
 void component_boxart_free (component_boxart_t *b);
 void component_boxart_draw (component_boxart_t *b);
 

src/menu/components/boxart.c

@@ -17,9 +17,9 @@ static void png_decoder_callback (png_err_t err, surface_t *decoded_image, void
 }
 
 
-component_boxart_t *component_boxart_init (const char *storage_prefix, char *game_code) {
+component_boxart_t *component_boxart_init (const char *storage_prefix, char *game_code, file_image_type_t current_image_view) {
     component_boxart_t *b;
-    char file_name[8];
+    char boxart_id_path[8];
 
     if ((b = calloc(1, sizeof(component_boxart_t))) == NULL) {
         return NULL;
@@ -29,21 +29,83 @@ component_boxart_t *component_boxart_init (const char *storage_prefix, char *gam
 
     path_t *path = path_init(storage_prefix, BOXART_DIRECTORY);
 
-    sprintf(file_name, "%.3s.png", game_code);
-    path_push(path, file_name);
+    sprintf(boxart_id_path, "%c/%c/%c/%c", game_code[0], game_code[1], game_code[2], game_code[3]);
+    path_push(path, boxart_id_path);
+
+    if (!directory_exists(path_get(path))) { // Allow boxart to not specify the region code.
+        path_pop(path);
+    }
+
+    if (directory_exists(path_get(path))) {
+        switch (current_image_view) {
+            case IMAGE_GAMEPAK_FRONT:
+                path_push(path, "gamepak_front.png");
+            case IMAGE_GAMEPAK_BACK:
+                path_push(path, "gamepak_back.png");
+            case IMAGE_BOXART_BACK:
+                path_push(path, "boxart_back.png");
+            case IMAGE_BOXART_LEFT:
+                path_push(path, "boxart_left.png");
+            case IMAGE_BOXART_RIGHT:
+                path_push(path, "boxart_right.png");
+            case IMAGE_BOXART_BOTTOM:
+                path_push(path, "boxart_bottom.png");
+            case IMAGE_BOXART_TOP:
+                path_push(path, "boxart_top.png");
+            default:
+                path_push(path, "boxart_front.png");
+        }
+
+        if (file_exists(path_get(path))) { 
             if (png_decoder_start(path_get(path), BOXART_WIDTH_MAX, BOXART_HEIGHT_MAX, png_decoder_callback, b) == PNG_OK) {
                 path_free(path);
                 return b;
             }
+        }
+    }
+    else { // compatibility mode
+
+        char file_name[8];
+
+        // reset the directory path used for boxart.
+        path = path_init(storage_prefix, BOXART_DIRECTORY);
+
+        sprintf(file_name, "%c%c%c%c.png", game_code[0], game_code[1], game_code[2], game_code[3]);
+        path_push(path, file_name);
+
+        if (file_exists(path_get(path))) {
+            if (png_decoder_start(path_get(path), BOXART_WIDTH_MAX, BOXART_HEIGHT_MAX, png_decoder_callback, b) == PNG_OK) {
+                path_free(path);
+                return b;
+            }
+        }
+
+        path_pop(path);
+        sprintf(file_name, "%c%c%c.png", game_code[0], game_code[1], game_code[2]);
+        path_push(path, file_name);
+
+        if (file_exists(path_get(path))) {
+            if (file_exists(path_get(path))) {
+                if (png_decoder_start(path_get(path), BOXART_WIDTH_MAX, BOXART_HEIGHT_MAX, png_decoder_callback, b) == PNG_OK) {
+                    path_free(path);
+                    return b;
+                }
+            }
+        }
+        else {
             path_pop(path);
 
-    // TODO: This is bad, we should only check for 3 letter codes
-    sprintf(file_name, "%.2s.png", game_code + 1);
+            sprintf(file_name, "%c%c.png", game_code[1], game_code[2]);
             path_push(path, file_name);
+            if (file_exists(path_get(path))) {
                 if (png_decoder_start(path_get(path), BOXART_WIDTH_MAX, BOXART_HEIGHT_MAX, png_decoder_callback, b) == PNG_OK) {
                     path_free(path);
                     return b;
                 }
+            }
+        }
+    }
+    // TODO: return default image.
 
     path_free(path);
     free(b);

src/menu/views/load_disk.c

@@ -170,7 +170,7 @@ void view_load_disk_init (menu_t *menu) {
         menu_show_error(menu, convert_error_message(err));
     }
 
-    boxart = component_boxart_init(menu->storage_prefix, menu->load.disk_info.id);
+    boxart = component_boxart_init(menu->storage_prefix, menu->load.disk_info.id, IMAGE_BOXART_FRONT);
 }
 
 void view_load_disk_display (menu_t *menu, surface_t *display) {

src/menu/views/load_rom.c

@@ -355,7 +355,7 @@ void view_load_rom_init (menu_t *menu) {
         return;
     }
 
-    boxart = component_boxart_init(menu->storage_prefix, menu->load.rom_info.game_code);
+    boxart = component_boxart_init(menu->storage_prefix, menu->load.rom_info.game_code, IMAGE_BOXART_FRONT);
 
     component_context_menu_init(&options_context_menu);
 }