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montage_test.py
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"""Unit tests for montaging images to create sprite atlases."""
from absl.testing import absltest
from PIL import Image
from PIL import ImageColor
import montage
class SpriteAtlasGeneratorTests(absltest.TestCase):
def setUp(self):
# Color settings used to verifying image output is correct
self.red_rgb = ImageColor.getrgb('red')
self.blue_rgb = ImageColor.getrgb('blue')
self.orange_rgb = ImageColor.getrgb('orange')
self.green_rgb = ImageColor.getrgb('green')
self.yellow_rgb = ImageColor.getrgb('yellow')
self.black_rgb = ImageColor.getrgb('black')
def testAtlasGeneratorDifferentInputSizes(self):
# Should raise error if image count does not match source path count.
atlas_settings = montage.SpriteAtlasSettings(img_format='png')
source_images_with_statuses = [(Image.new('RGBA', (50, 30)), '')] * 5
source_paths = ['/some/path/file' + str(i) + '.jpg' for i in range(0, 4)]
with self.assertRaises(ValueError):
montage.SpriteAtlasGenerator(
images_with_statuses=source_images_with_statuses,
img_src_paths=source_paths,
atlas_settings=atlas_settings,
default_img=Image.new('RGBA', (50, 30)))
def testAtlasGeneratorDifferentImageSizes(self):
# Should raise error if converted images are different sizes.
atlas_settings = montage.SpriteAtlasSettings(img_format='png')
source_images_with_statuses = [
(Image.new('RGBA', (50, 30)), ''),
(Image.new('RGBA', (50, 30)), ''),
(Image.new('RGBA', (50, 30)), ''),
(Image.new('RGBA', (50, 10)), '')
]
source_paths = ['/some/path/file' + str(i) + '.jpg' for i in range(0, 4)]
with self.assertRaises(ValueError):
montage.SpriteAtlasGenerator(
images_with_statuses=source_images_with_statuses,
img_src_paths=source_paths,
atlas_settings=atlas_settings,
default_img=Image.new('RGBA', (50, 30)))
def testCreateAtlasIfNoSizeSpecified(self):
# Verify that manifests and atlases contains single items.
# and verify atlas size is correct.
atlas_settings = montage.SpriteAtlasSettings(img_format='png')
source_images_with_statuses = [(Image.new('RGBA', (50, 30)), '')] * 20
source_paths = ['/some/path/file' + str(i) + '.jpg' for i in range(0, 20)]
atlas_generator = montage.SpriteAtlasGenerator(
images_with_statuses=source_images_with_statuses,
img_src_paths=source_paths,
atlas_settings=atlas_settings,
default_img=Image.new('RGBA', (50, 30)))
atlases, manifests = atlas_generator.create_atlas()
self.assertEqual(len(atlases), 1)
self.assertEqual(atlases[0].size, (250, 150))
self.assertEqual(len(manifests), 1)
self.assertEqual(len(manifests[0]), 20)
def testCreateAtlas(self):
# Verify that atlas is correct based on sampling pixels and output size.
atlas_settings = montage.SpriteAtlasSettings(img_format='png')
source_paths = ['/some/path/file' + str(i) + '.jpg' for i in range(0, 4)]
images_with_statuses = [
(Image.new('RGBA', (50, 50), self.orange_rgb), ''),
(Image.new('RGBA', (50, 50), self.red_rgb), ''),
(Image.new('RGBA', (50, 50), self.green_rgb), ''),
(Image.new('RGBA', (50, 50), self.yellow_rgb), '')
]
atlas_generator = montage.SpriteAtlasGenerator(
images_with_statuses=images_with_statuses, img_src_paths=source_paths,
atlas_settings=atlas_settings,
default_img=Image.new('RGBA', (50, 50), self.black_rgb))
atlases, manifests = atlas_generator.create_atlas()
atlas = atlases[0] # Only care about a single atlas
del manifests
self.assertEqual(atlas.size, (100, 100))
# Verify pixels in corners of atlas.
self.assertEqual(atlas.getpixel((0, 0))[0:3], self.orange_rgb)
self.assertEqual(atlas.getpixel((99, 0))[0:3], self.red_rgb)
self.assertEqual(atlas.getpixel((0, 99))[0:3], self.green_rgb)
self.assertEqual(atlas.getpixel((99, 99))[0:3], self.yellow_rgb)
# Verify pixels in center of atlas
self.assertEqual(atlas.getpixel((49, 49))[0:3], self.orange_rgb)
self.assertEqual(atlas.getpixel((50, 49))[0:3], self.red_rgb)
self.assertEqual(atlas.getpixel((49, 50))[0:3], self.green_rgb)
self.assertEqual(atlas.getpixel((50, 50))[0:3], self.yellow_rgb)
def testCreateAtlasWithFailures(self):
# Verify that atlas is correct based on sampling pixels and output size.
# when one of the images failed retrival/conversion.
atlas_settings = montage.SpriteAtlasSettings(img_format='png')
source_paths = ['/some/path/file' + str(i) + '.jpg' for i in range(0, 4)]
images_with_statuses = [
(Image.new('RGBA', (50, 50), self.orange_rgb), ''),
(Image.new('RGBA', (50, 50), self.red_rgb), ''),
(None, 'some error message'), # Failed
(Image.new('RGBA', (50, 50), self.yellow_rgb), '')
]
atlas_generator = montage.SpriteAtlasGenerator(
images_with_statuses=images_with_statuses, img_src_paths=source_paths,
atlas_settings=atlas_settings,
default_img=Image.new('RGBA', (50, 50), self.black_rgb))
atlases, manifests = atlas_generator.create_atlas()
atlas = atlases[0] # Only care about a single atlas
del manifests
self.assertEqual(atlas.size, (100, 100))
# Verify pixels in corners of atlas.
self.assertEqual(atlas.getpixel((0, 0))[0:3], self.orange_rgb)
self.assertEqual(atlas.getpixel((99, 0))[0:3], self.red_rgb)
self.assertEqual(atlas.getpixel((0, 99))[0:3], self.black_rgb)
self.assertEqual(atlas.getpixel((99, 99))[0:3], self.yellow_rgb)
# Verify pixels in center of atlas
self.assertEqual(atlas.getpixel((49, 49))[0:3], self.orange_rgb)
self.assertEqual(atlas.getpixel((50, 49))[0:3], self.red_rgb)
self.assertEqual(atlas.getpixel((49, 50))[0:3], self.black_rgb)
self.assertEqual(atlas.getpixel((50, 50))[0:3], self.yellow_rgb)
def testCreateAtlasManifest(self):
# Verify manifest contains correct data.
atlas_settings = montage.SpriteAtlasSettings(img_format='png')
source_images_with_statuses = [(Image.new('RGBA', (50, 30)), '')] * 4
source_paths = ['/some/path/file' + str(i) + '.jpg' for i in range(0, 4)]
expected_manifest = [
{'source_image': '/some/path/file0.jpg', 'offset_x': 0,
'image_name': 'file0.jpg', 'offset_y': 0},
{'source_image': '/some/path/file1.jpg', 'offset_x': 50,
'image_name': 'file1.jpg', 'offset_y': 0},
{'source_image': '/some/path/file2.jpg', 'offset_x': 0,
'image_name': 'file2.jpg', 'offset_y': 30},
{'source_image': '/some/path/file3.jpg', 'offset_x': 50,
'image_name': 'file3.jpg', 'offset_y': 30}]
atlas_generator = montage.SpriteAtlasGenerator(
images_with_statuses=source_images_with_statuses,
img_src_paths=source_paths,
atlas_settings=atlas_settings,
default_img=Image.new('RGBA', (50, 50), self.black_rgb))
atlases, manifests = atlas_generator.create_atlas()
del atlases # linter
self.assertEqual(manifests[0], expected_manifest)
def testCreateAtlasManifestWithImgFailures(self):
# Verify manifest contains correct data when one image failed.
atlas_settings = montage.SpriteAtlasSettings(img_format='png')
source_images_with_statuses = [(
Image.new('RGBA', (50, 30)), '')] * 3 + [(None, 'Failure msg')]
source_paths = ['/some/path/file' + str(i) + '.jpg' for i in range(0, 4)]
expected_manifest = [
{'source_image': '/some/path/file0.jpg', 'offset_x': 0,
'image_name': 'file0.jpg', 'offset_y': 0},
{'source_image': '/some/path/file1.jpg', 'offset_x': 50,
'image_name': 'file1.jpg', 'offset_y': 0},
{'source_image': '/some/path/file2.jpg', 'offset_x': 0,
'image_name': 'file2.jpg', 'offset_y': 30},
{'source_image': '/some/path/file3.jpg', 'offset_x': 50,
'image_name': 'file3.jpg', 'offset_y': 30, 'errors': 'Failure msg'}]
atlas_generator = montage.SpriteAtlasGenerator(
images_with_statuses=source_images_with_statuses,
img_src_paths=source_paths,
atlas_settings=atlas_settings,
default_img=Image.new('RGBA', (50, 50), self.black_rgb))
atlases, manifests = atlas_generator.create_atlas()
del atlases # linter
self.assertEqual(manifests[0], expected_manifest)
if __name__ == '__main__':
absltest.main()