feat: implement album art display functionality and update application version to dev50

source/gui.c

@@ -3,6 +3,8 @@
 #include <citro3d.h>
 #include <string.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <png.h>
 #include "gui.h"
 #include "metadata.h"
 
@@ -180,14 +182,6 @@ void guiDisplayMetadata(struct metadata_t* metadata, const char* filename)
 		C2D_TextOptimize(&text);
 		C2D_DrawText(&text, C2D_WithColor, 10.0f, y, 0.5f, scale * 0.8f, scale * 0.8f, GUI_COLOR_TEXT_DIM);
 	}
-	
-	/* Draw album art indicator if available */
-	if(metadata->hasAlbumArt)
-	{
-		C2D_TextParse(&text, textBuf, "[Art]");
-		C2D_TextOptimize(&text);
-		C2D_DrawText(&text, C2D_WithColor, 350.0f, 10.0f, 0.5f, 0.4f, 0.4f, GUI_COLOR_ACCENT);
-	}
 }
 
 /**
@@ -343,3 +337,130 @@ void guiDisplayVersion(const char* version)
 	C2D_TextOptimize(&text);
 	C2D_DrawText(&text, C2D_WithColor, 80.0f, 220.0f, 0.5f, 0.45f, 0.45f, GUI_COLOR_TEXT_DIM);
 }
+
+/**
+ * PNG read callback for memory buffer
+ */
+static void pngReadCallback(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+	uint8_t** buffer_ptr = (uint8_t**)png_get_io_ptr(png_ptr);
+	memcpy(data, *buffer_ptr, length);
+	*buffer_ptr += length;
+}
+
+/**
+ * Display album art on top screen
+ */
+void guiDisplayAlbumArt(struct metadata_t* metadata)
+{
+	if(!metadata || !metadata->hasAlbumArt || !metadata->albumArt)
+		return;
+	
+	C2D_SceneBegin(topTarget);
+	
+	/* Decode PNG image */
+	png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+	if(!png_ptr)
+		return;
+	
+	png_infop info_ptr = png_create_info_struct(png_ptr);
+	if(!info_ptr)
+	{
+		png_destroy_read_struct(&png_ptr, NULL, NULL);
+		return;
+	}
+	
+	if(setjmp(png_jmpbuf(png_ptr)))
+	{
+		png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+		return;
+	}
+	
+	/* Set up custom read function */
+	uint8_t* buffer_ptr = metadata->albumArt;
+	png_set_read_fn(png_ptr, &buffer_ptr, pngReadCallback);
+	
+	/* Read PNG info */
+	png_read_info(png_ptr, info_ptr);
+	
+	int width = png_get_image_width(png_ptr, info_ptr);
+	int height = png_get_image_height(png_ptr, info_ptr);
+	png_byte color_type = png_get_color_type(png_ptr, info_ptr);
+	png_byte bit_depth = png_get_bit_depth(png_ptr, info_ptr);
+	
+	/* Convert to RGBA8 */
+	if(bit_depth == 16)
+		png_set_strip_16(png_ptr);
+	if(color_type == PNG_COLOR_TYPE_PALETTE)
+		png_set_palette_to_rgb(png_ptr);
+	if(color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
+		png_set_expand_gray_1_2_4_to_8(png_ptr);
+	if(png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
+		png_set_tRNS_to_alpha(png_ptr);
+	if(color_type == PNG_COLOR_TYPE_RGB ||
+	   color_type == PNG_COLOR_TYPE_GRAY ||
+	   color_type == PNG_COLOR_TYPE_PALETTE)
+		png_set_filler(png_ptr, 0xFF, PNG_FILLER_AFTER);
+	if(color_type == PNG_COLOR_TYPE_GRAY ||
+	   color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+		png_set_gray_to_rgb(png_ptr);
+	
+	png_read_update_info(png_ptr, info_ptr);
+	
+	/* Allocate image buffer */
+	png_bytep* row_pointers = (png_bytep*)malloc(sizeof(png_bytep) * height);
+	if(!row_pointers)
+	{
+		png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+		return;
+	}
+	
+	for(int y = 0; y < height; y++)
+	{
+		row_pointers[y] = (png_byte*)malloc(png_get_rowbytes(png_ptr, info_ptr));
+		if(!row_pointers[y])
+		{
+			for(int i = 0; i < y; i++)
+				free(row_pointers[i]);
+			free(row_pointers);
+			png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+			return;
+		}
+	}
+	
+	/* Read image data */
+	png_read_image(png_ptr, row_pointers);
+	
+	/* Scale to fit in top-right corner (max 60x60) */
+	int displayWidth = width;
+	int displayHeight = height;
+	if(width > 60 || height > 60)
+	{
+		float scale = 60.0f / (width > height ? width : height);
+		displayWidth = (int)(width * scale);
+		displayHeight = (int)(height * scale);
+	}
+	
+	/* Draw the image pixel by pixel */
+	float startX = 330.0f; /* Top right corner */
+	float startY = 10.0f;
+	
+	for(int y = 0; y < displayHeight; y++)
+	{
+		int srcY = (y * height) / displayHeight;
+		for(int x = 0; x < displayWidth; x++)
+		{
+			int srcX = (x * width) / displayWidth;
+			png_bytep px = &(row_pointers[srcY][srcX * 4]);
+			u32 color = C2D_Color32(px[0], px[1], px[2], px[3]);
+			C2D_DrawRectSolid(startX + x, startY + y, 0.5f, 1, 1, color);
+		}
+	}
+	
+	/* Clean up */
+	for(int y = 0; y < height; y++)
+		free(row_pointers[y]);
+	free(row_pointers);
+	
+	png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+}