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"""Test DdsImagePlugin"""
from io import BytesIO
import pytest
from PIL import DdsImagePlugin, Image
from .helper import assert_image_equal
TEST_FILE_DXT1 = "Tests/images/dxt1-rgb-4bbp-noalpha_MipMaps-1.dds"
TEST_FILE_DXT3 = "Tests/images/dxt3-argb-8bbp-explicitalpha_MipMaps-1.dds"
TEST_FILE_DXT5 = "Tests/images/dxt5-argb-8bbp-interpolatedalpha_MipMaps-1.dds"
TEST_FILE_DX10_BC7 = "Tests/images/bc7-argb-8bpp_MipMaps-1.dds"
TEST_FILE_DX10_BC7_UNORM_SRGB = "Tests/images/DXGI_FORMAT_BC7_UNORM_SRGB.dds"
TEST_FILE_DX10_R8G8B8A8 = "Tests/images/argb-32bpp_MipMaps-1.dds"
TEST_FILE_DX10_R8G8B8A8_UNORM_SRGB = "Tests/images/DXGI_FORMAT_R8G8B8A8_UNORM_SRGB.dds"
TEST_FILE_UNCOMPRESSED_RGB = "Tests/images/uncompressed_rgb.dds"
def test_sanity_dxt1():
"""Check DXT1 images can be opened"""
with Image.open(TEST_FILE_DXT1.replace(".dds", ".png")) as target:
target = target.convert("RGBA")
with Image.open(TEST_FILE_DXT1) as im:
im.load()
assert im.format == "DDS"
assert im.mode == "RGBA"
assert im.size == (256, 256)
assert_image_equal(im, target)
def test_sanity_dxt5():
"""Check DXT5 images can be opened"""
with Image.open(TEST_FILE_DXT5) as im:
im.load()
assert im.format == "DDS"
assert im.mode == "RGBA"
assert im.size == (256, 256)
with Image.open(TEST_FILE_DXT5.replace(".dds", ".png")) as target:
assert_image_equal(target, im)
def test_sanity_dxt3():
"""Check DXT3 images can be opened"""
with Image.open(TEST_FILE_DXT3.replace(".dds", ".png")) as target:
with Image.open(TEST_FILE_DXT3) as im:
im.load()
assert im.format == "DDS"
assert im.mode == "RGBA"
assert im.size == (256, 256)
assert_image_equal(target, im)
def test_dx10_bc7():
"""Check DX10 images can be opened"""
with Image.open(TEST_FILE_DX10_BC7) as im:
im.load()
assert im.format == "DDS"
assert im.mode == "RGBA"
assert im.size == (256, 256)
with Image.open(TEST_FILE_DX10_BC7.replace(".dds", ".png")) as target:
assert_image_equal(target, im)
def test_dx10_bc7_unorm_srgb():
"""Check DX10 unsigned normalized integer images can be opened"""
with Image.open(TEST_FILE_DX10_BC7_UNORM_SRGB) as im:
im.load()
assert im.format == "DDS"
assert im.mode == "RGBA"
assert im.size == (16, 16)
assert im.info["gamma"] == 1 / 2.2
with Image.open(
TEST_FILE_DX10_BC7_UNORM_SRGB.replace(".dds", ".png")
) as target:
assert_image_equal(target, im)
def test_dx10_r8g8b8a8():
"""Check DX10 images can be opened"""
with Image.open(TEST_FILE_DX10_R8G8B8A8) as im:
im.load()
assert im.format == "DDS"
assert im.mode == "RGBA"
assert im.size == (256, 256)
with Image.open(TEST_FILE_DX10_R8G8B8A8.replace(".dds", ".png")) as target:
assert_image_equal(target, im)
def test_dx10_r8g8b8a8_unorm_srgb():
"""Check DX10 unsigned normalized integer images can be opened"""
with Image.open(TEST_FILE_DX10_R8G8B8A8_UNORM_SRGB) as im:
im.load()
assert im.format == "DDS"
assert im.mode == "RGBA"
assert im.size == (16, 16)
assert im.info["gamma"] == 1 / 2.2
with Image.open(
TEST_FILE_DX10_R8G8B8A8_UNORM_SRGB.replace(".dds", ".png")
) as target:
assert_image_equal(target, im)
def test_unimplemented_dxgi_format():
with pytest.raises(NotImplementedError):
Image.open("Tests/images/unimplemented_dxgi_format.dds")
def test_uncompressed_rgb():
"""Check uncompressed RGB images can be opened"""
with Image.open(TEST_FILE_UNCOMPRESSED_RGB) as im:
im.load()
assert im.format == "DDS"
assert im.mode == "RGBA"
assert im.size == (800, 600)
with Image.open(TEST_FILE_UNCOMPRESSED_RGB.replace(".dds", ".png")) as target:
assert_image_equal(target, im)
def test__validate_true():
"""Check valid prefix"""
# Arrange
prefix = b"DDS etc"
# Act
output = DdsImagePlugin._validate(prefix)
# Assert
assert output
def test__validate_false():
"""Check invalid prefix"""
# Arrange
prefix = b"something invalid"
# Act
output = DdsImagePlugin._validate(prefix)
# Assert
assert not output
def test_short_header():
""" Check a short header"""
with open(TEST_FILE_DXT5, "rb") as f:
img_file = f.read()
def short_header():
Image.open(BytesIO(img_file[:119]))
with pytest.raises(OSError):
short_header()
def test_short_file():
""" Check that the appropriate error is thrown for a short file"""
with open(TEST_FILE_DXT5, "rb") as f:
img_file = f.read()
def short_file():
with Image.open(BytesIO(img_file[:-100])) as im:
im.load()
with pytest.raises(OSError):
short_file()
def test_unimplemented_pixel_format():
with pytest.raises(NotImplementedError):
Image.open("Tests/images/unimplemented_pixel_format.dds")
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