🧑‍💻 image2bin --transparency flag

Author: thinkyhead

buildroot/share/scripts/gen-tft-image.py

@@ -25,41 +25,51 @@
 import sys, struct
 from PIL import Image
 
-def image2bin(image, output_file):
-    print(f"Converting image with dimensions {image.size[0]}x{image.size[1]}...")
+def image2bin(image, output_file, transparency):
+    w, h = image.size[0], image.size[1]
+    print(f"Converting image with dimensions {w}x{h}...")
     if output_file.endswith(('.c', '.cpp')):
         is_cpp = True
+        row_sp, item_sp = ("  ", "") if w >= 480 else (" ", " ")
+        row_end, data_end = "\n", "};\n"
         f = open(output_file, 'wt')
-        f.write("const uint16_t image[%d] = {\n" % (image.size[1] * image.size[0]))
+        f.write("const uint16_t image[%d] = {\n" % (h * w))
     else:
         is_cpp = False
+        row_sp, row_end, data_end = b"", b"", b""
         f = open(output_file, 'wb')
+    tcolor, got_tcolor = 0, False
     pixs = image.load()
-    for y in range(image.size[1]):
-        f.write(" ")
-        for x in range(image.size[0]):
+    for y in range(h):
+        f.write(row_sp)
+        for x in range(w):
             R = pixs[x, y][0] >> 3
             G = pixs[x, y][1] >> 2
             B = pixs[x, y][2] >> 3
             rgb = (R << 11) | (G << 5) | B
-            if rgb == 0: rgb = 1
+            if transparency:
+                if not got_tcolor:
+                    got_tcolor = True
+                    tcolor = rgb            # First pixel color is transparent
+                if rgb == tcolor: rgb = 1   # "color 1" is transparent
             if is_cpp:
-                strHex = " 0x{0:04X},".format(rgb)
+                strHex = item_sp + "0x{0:04X},".format(rgb)
                 f.write(strHex)
             else:
                 f.write(struct.pack("B", (rgb & 0xFF)))
                 f.write(struct.pack("B", (rgb >> 8) & 0xFF))
-        if is_cpp: f.write("\n")
-    if is_cpp: f.write("};\n")
+        f.write(row_end)
+    f.write(data_end)
     f.close()
 
 if len(sys.argv) <= 2:
     print("Utility to export a image in Marlin TFT friendly format.")
     print("It will dump a raw bin RGB565 image or create a CPP file with an array of 16 bit image pixels.")
-    print("Usage: gen-tft-image.py INPUT_IMAGE.(png|bmp|jpg) OUTPUT_FILE.(cpp|bin)")
+    print("Usage: gen-tft-image.py INPUT_IMAGE.(png|bmp|jpg) OUTPUT_FILE.(cpp|bin) [--transparency]")
     print("Author: rhapsodyv")
     exit(1)
 
+transparency = len(sys.argv) > 3 and sys.argv[3] == "--transparency"
 output_img = sys.argv[2]
 img = Image.open(sys.argv[1])
-image2bin(img, output_img)
+image2bin(img, output_img, transparency)