improved game end screen, fixed minor bug displaying high scores

CHANGELOG.txt

···
+Version 1.1.0:
+ - game end screen now flashes "GAME OVER" instead of just displaying it
+ - displayed high score now updates when the game is restarted

src/drawing.c

···
 
 unsigned char global_palette[32 + sizeof_grid_palette];
 unsigned char deathStage;
+bool deathFlashOn;
+unsigned long nextDeathFlash;
 
 struct gfx_sprite_t *fileSprites[14];
 struct gfx_sprite_t *fileMatchSprites[6];
···
 struct gfx_sprite_t *deathSprites[3];
 
 gfx_UninitedSprite(behindExa, exa_empty_width, exa_empty_height);
+gfx_UninitedSprite(behindGameOver, play_again_width, play_again_height);
 
 void drawExa()
 {
···
 	}
 
 	// ask the player to try again
+	behindGameOver->width = play_again_width;
+	behindGameOver->height = play_again_height;
+	gfx_GetSprite(behindGameOver, PLAY_AGAIN_HOFFSET, PLAY_AGAIN_VOFFSET);
 	gfx_RLETSprite_NoClip(play_again, PLAY_AGAIN_HOFFSET, PLAY_AGAIN_VOFFSET);
 	gfx_BlitBuffer();
+	deathFlashOn = true;
+	nextDeathFlash = clock() + GAME_OVER_FLASH_TIME;
+}
+
+void deathPeriodic()
+{
+	if (clock() < nextDeathFlash) return;
+
+	if (deathFlashOn) gfx_Sprite_NoClip(behindGameOver, PLAY_AGAIN_HOFFSET, PLAY_AGAIN_VOFFSET);
+	else gfx_RLETSprite_NoClip(play_again, PLAY_AGAIN_HOFFSET, PLAY_AGAIN_VOFFSET);
+
+	gfx_BlitBuffer();
+
+	deathFlashOn = !deathFlashOn;
+	nextDeathFlash = clock() + GAME_OVER_FLASH_TIME;
 }

src/drawing.h

···
 void drawFrame();
 bool titleScreen();
 void animateDeath();
+void deathPeriodic();
 
 #endif

src/main.c

···
 		const unsigned char saveVar = ti_Open(SAVE_VAR_NAME, "w");
 		ti_Write(&score, 3, 1, saveVar);
 		ti_Close(saveVar);
+		highScore = score;
 	}
 
 	if (gameOver)
···
 		// wait for input to either exit or restart
 		while (true)
 		{
+			deathPeriodic();
+
 			kb_Scan();
 
 			if (kb_IsDown(kb_KeyClear)) return false;

src/variables.h

···
 #define CLEAR_ANIMATION_FRAME_TIME 1600
 #define DEATH_ANIMATION_FRAME_TIME 16000
 #define DEATH_DARKEN_LEVEL 232
+#define GAME_OVER_FLASH_TIME 32000
 
 #define BG_HOFFSET ((GFX_LCD_WIDTH - background_width) / 2)
 #define BG_VOFFSET ((GFX_LCD_HEIGHT - background_height) / 2)