adding tilegrid_inflator

adafruit_imageload/tilegrid_inflator.py

@@ -0,0 +1,100 @@
+# SPDX-FileCopyrightText: 2022 Tim Cocks for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+"""
+`adafruit_imageload.tilegrid_inflator`
+====================================================
+
+Use a 3x3 spritesheet to inflate a larger grid of tiles, duplicating the center rows and
+columns as many times as needed to reach a target size.
+
+* Author(s): Tim Cocks
+
+"""
+
+__version__ = "0.0.0-auto.0"
+__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_ImageLoad.git"
+
+import displayio
+import adafruit_imageload
+
+
+def inflate_tilegrid(
+    bmp_path=None,
+    target_size=(3, 3),
+    tile_size=None,
+    transparent_index=None,
+    bmp_obj=None,
+    bmp_palette=None,
+):
+    """
+    inflate a TileGrid of ``target_size`` in tiles from a 3x3 spritesheet by duplicating
+    the center rows and columns.
+
+    :param Optional[str] bmp_path: filepath to the 3x3 spritesheet bitmap file
+    :param Optional[tuple] target_size: desired size in tiles (target_width, target_height)
+    :param Optional[tuple] tile_size: size of the tiles in the 3x3 spritesheet. If
+      None is used it will equally divide the width and height of the Bitmap by 3.
+    :param Optional[Union[tuple, int]] transparent_index: a single index within the palette to
+      make transparent, or a tuple of multiple indexes to make transparent
+    :param Optional[OnDiskBitmap] bmp_obj: Already loaded 3x3 spritesheet in an OnDiskBitmap
+    :param Optional[Palette] bmp_palette: Already loaded spritesheet Palette
+    """
+
+    # pylint: disable=too-many-arguments, too-many-locals, too-many-branches
+
+    if bmp_path is None and (bmp_obj is None and bmp_palette is None):
+        raise AttributeError("Must pass either bmp_path or bmp_obj and bmp_palette")
+
+    if bmp_path is not None:
+        image, palette = adafruit_imageload.load(bmp_path)
+    else:
+        image = bmp_obj
+        palette = bmp_palette
+
+    if transparent_index is not None:
+        if isinstance(transparent_index, tuple):
+            for index in transparent_index:
+                palette.make_transparent(index)
+        elif isinstance(transparent_index, int):
+            palette.make_transparent(transparent_index)
+
+    if tile_size is None:
+        tile_width = image.width // 3
+        tile_height = image.height // 3
+    else:
+        tile_width = tile_size[0]
+        tile_height = tile_size[1]
+
+    target_width = target_size[0]
+    target_height = target_size[1]
+
+    tile_grid = displayio.TileGrid(
+        image,
+        pixel_shader=palette,
+        height=target_height,
+        width=target_width,
+        tile_width=tile_width,
+        tile_height=tile_height,
+    )
+
+    # corners
+    tile_grid[0, 0] = 0  # upper left
+    tile_grid[tile_grid.width - 1, 0] = 2  # upper right
+    tile_grid[0, tile_grid.height - 1] = 6  # lower left
+    tile_grid[tile_grid.width - 1, tile_grid.height - 1] = 8  # lower right
+
+    for x in range(target_size[0] - 2):
+        tile_grid[x + 1, 0] = 1
+        tile_grid[x + 1, tile_grid.height - 1] = 7
+
+    for y in range(target_size[1] - 2):
+        tile_grid[0, y + 1] = 3
+        tile_grid[tile_grid.width - 1, y + 1] = 5
+
+    for y in range(target_size[1] - 2):
+        for x in range(target_size[0] - 2):
+            tile_grid[x + 1, y + 1] = 4
+
+    return tile_grid

docs/api.rst

@@ -12,3 +12,6 @@
 
 .. automodule:: adafruit_imageload.bmp.indexed
   :members:
+
+.. automodule:: adafruit_imageload.tilegrid_inflator
+   :members:

docs/examples.rst

@@ -15,3 +15,12 @@ Loads image that is fetched using adafruit_request
 .. literalinclude:: ../examples/imageload_from_web.py
     :caption: examples/imageload_from_web.py
     :linenos:
+
+Inflate TileGrid test
+---------------------
+
+Load 3x3 spritesheet and inflate it to a larger sized TileGrid
+
+.. literalinclude:: ../examples/imageload_tilegrid_inflator_simpletest.py
+    :caption: examples/imageload_tilegrid_inflator_simpletest.py
+    :linenos:

examples/imageload_tilegrid_inflator_simpletest.py

@@ -0,0 +1,17 @@
+# SPDX-FileCopyrightText: 2022 Tim Cocks for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+import board
+import displayio
+import adafruit_imageload
+from adafruit_imageload.tilegrid_inflator import inflate_tilegrid
+
+image, palette = adafruit_imageload.load("images/castle_spritesheet.bmp")
+tile_grid = inflate_tilegrid(bmp_obj=image, bmp_palette=palette, target_size=(10, 8))
+
+group = displayio.Group()
+group.append(tile_grid)
+board.DISPLAY.show(group)
+
+while True:
+    pass

examples/images/castle_spritesheet.bmp.license

@@ -0,0 +1,2 @@
+# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
+# SPDX-License-Identifier: MIT