Image generation?

assets/CMakeLists.txt

@@ -3,6 +3,5 @@
 # This software is released under the MIT License.
 # https://opensource.org/licenses/MIT
 
-add_asset(test.palette.png)
-# add_asset(first.palette.png)
-# add_asset(entities.tsx)
+add_asset(first.palette.png)
+add_asset(entities.tsx)

src/asset/asset.c

@@ -40,18 +40,6 @@ errorret_t assetInit(void) {
   // Did we open the asset?
   if(ASSET.zip == NULL) errorThrow("Failed to open asset file.");
 
-  // Get "test.palette.dpf" file.
-  zip_file_t *file = zip_fopen(ASSET.zip, "test.palette.dpf", 0);
-  if(file == NULL) errorThrow("Failed to open test.palette.dpf in asset file.");
-
-  // Read it
-  char_t buffer[256];
-  zip_int64_t n = zip_fread(file, buffer, 256);
-  if(n < 0) {
-    zip_fclose(file);
-    errorThrow("Failed to read test.palette.dpf in asset file.");
-  }
-
   errorOk();
 }
 
@@ -98,6 +86,8 @@ void assetLoad(
     return;
   }
 
+  printf("Loading asset: %s\n", filename);
+
   // Determine length of the file (uncompressed)
   struct zip_stat st;
   if(zip_stat(ASSET.zip, filename, 0, &st) != 0) {

src/engine/engine.c

@@ -35,7 +35,7 @@ errorret_t engineInit(void) {
   errorChain(assetInit());
   errorChain(displayInit());
 
-  assetLoad("test.palette.dpf", assetLoadCallback, NULL);
+  assetLoad("first.palette.dpf", assetLoadCallback, NULL);
   if(ASSET.state == ASSET_STATE_ERROR) errorChain(ASSET.error);
 
   sceneTestAdd();

tools/assetstool/processimage.py

@@ -2,6 +2,10 @@ import os
 from args import args
 from PIL import Image
 import struct
+import sys
+from assethelpers import getAssetRelativePath
+
+PALETTES = []
 
 def extractPaletteFromImage(image):
   # goes through and finds all unique colors in the image
@@ -10,6 +14,9 @@ def extractPaletteFromImage(image):
   pixels = list(image.getdata())
   uniqueColors = []
   for color in pixels:
+    # We treat alpha 0 as rgba(0,0,0,0) for palette purposes
+    if color[3] == 0:
+      color = (0, 0, 0, 0)
     if color not in uniqueColors:
       uniqueColors.append(color)
   return uniqueColors
@@ -40,21 +47,70 @@ def processPalette(assetPath):
 
   outputRelative = os.path.relpath(outputFilePath, args.output_assets)
 
-  return {
+  palette = {
     "outputFile": outputRelative,
     "paletteColors": len(pixels),
-    "files": [ outputFilePath ]
+    "files": [ outputFilePath ],
+    "pixels": pixels
   }
 
+  PALETTES.append(palette)
+
+  return palette
+
 def processImage(assetPath):
   print(f"Processing image: {assetPath}")
   
   # Load the image
   image = Image.open(assetPath)
-  pixels = extractPaletteFromImage(image)
+
+  # Get the image's palette because we are going to try and find a matching
+  # palette from the already processed palettes...
+  imagePalette = extractPaletteFromImage(image)
+  
+  # Now find which palette has every single color in this image's palette
+  paletteIndex = -1
+  for i, palette in enumerate(PALETTES):
+    paletteColors = palette["pixels"]
+    if all(color in paletteColors for color in imagePalette):
+      paletteIndex = i
+      break
+
+  # Did we manage to find a matching palette?
+  if paletteIndex == -1:
+    print(f"Error: No matching palette found for image {assetPath}. Please process a suitable palette first.")
+    sys.exit(1)
+    
+  # We found the palette, so now we can convert the image to use that palette
+  palette = PALETTES[paletteIndex]
+  indexes = []
+  for color in imagePalette:
+    if color in palette["pixels"]:
+      index = palette["pixels"].index(color)
+      indexes.append(index)
+    else:
+      print(f"Error: Color {color} in image {assetPath} not found in palette.")
+      sys.exit(1)
+
+  relative = getAssetRelativePath(assetPath)
+  fileNameWithoutExt = os.path.splitext(os.path.basename(assetPath))[0]
+  outputFileRelative = os.path.join(os.path.dirname(relative), f"{fileNameWithoutExt}.dpi")
+  outputFilePath = os.path.join(args.output_assets, outputFileRelative)
+  os.makedirs(os.path.dirname(outputFilePath), exist_ok=True)
+  with open(outputFilePath, "wb") as f:
+    # Write header
+    f.write(b"DPI")  # Dusk Palettized Image
+    f.write(struct.pack("<i", image.width))   # Width
+    f.write(struct.pack("<i", image.height))  # Height
+    f.write(struct.pack("<i", paletteIndex))  # Palette index
+    
+    # Write uint8_t pixel index.
+    for index in indexes:
+      f.write(struct.pack("B", index))
 
   return {
-    # "outputFile": os.path.relpath(assetPath, args.input_assets),
-    # "paletteColors": len(pixels),
-    "files": [ assetPath ]
+    "paletteIndex": paletteIndex,
+    "palette": PALETTES[paletteIndex],
+    "outputFile": outputFileRelative,
+    "files": [ assetPath, outputFilePath ]
   }

tools/assetstool/processtileset.py

@@ -47,32 +47,28 @@ def processTileset(assetPath):
   relativeFile = getAssetRelativePath(assetPath)
   relativeDir = os.path.dirname(relativeFile)
 
-  data = "DTF"  # Header for Dusk Tileset Format
-  # Write width (int32_t)
-  data += tilewidth.to_bytes(4, byteorder='little').decode('latin1')
-  # Write height (int32_t)
-  data += tileheight.to_bytes(4, byteorder='little').decode('latin1')
-  # Write tilecount (int32_t)
-  data += tilecount.to_bytes(4, byteorder='little').decode('latin1')
-  # Write column count (int32_t)
-  data += columns.to_bytes(4, byteorder='little').decode('latin1')
-  # Write row count (int32_t)
   rows = (tilecount + columns - 1) // columns
-  data += rows.to_bytes(4, byteorder='little').decode('latin1')
+
+  buf = bytearray(b"DTF")
+  buf += tilewidth.to_bytes(4, byteorder='little')
+  buf += tileheight.to_bytes(4, byteorder='little')
+  buf += tilecount.to_bytes(4, byteorder='little')
+  buf += columns.to_bytes(4, byteorder='little')
+  buf += rows.to_bytes(4, byteorder='little')
 
   # Write image source file name, padd to ASSET_FILE_NAME_MAX_LENGTH
   imageSourceBytes = image["outputFile"].encode('utf-8')
-  data += len(imageSourceBytes).to_bytes(4, byteorder='little').decode('latin1')
-  data += imageSourceBytes.decode('latin1')
+  buf += len(imageSourceBytes).to_bytes(4, byteorder='little')
+  buf += imageSourceBytes
   paddingLength = max(0, ASSET_FILE_NAME_MAX_LENGTH - len(imageSourceBytes))
-  data += '\x00' * paddingLength
+  buf += b'\x00' * paddingLength
 
   # Write to output file
   fileNameWithoutExt = os.path.splitext(os.path.basename(assetPath))[0]
   outputFilePath = os.path.join(args.output_assets, relativeDir, f"{fileNameWithoutExt}.dtf")
   os.makedirs(os.path.dirname(outputFilePath), exist_ok=True)
   with open(outputFilePath, 'wb') as f:
-    f.write(data.encode('latin1'))
+    f.write(buf)
 
   return {
     "outputFile": os.path.relpath(outputFilePath, args.output_assets),
@@ -81,5 +77,6 @@ def processTileset(assetPath):
     "tileCount": tilecount,
     "columns": columns,
     "rows": rows,
-    "image": image
+    "image": image,
+    "files": [ outputFilePath ] + image["files"]
   }