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209 lines
9.1 KiB
Python
209 lines
9.1 KiB
Python
import unittest
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from parameterized import parameterized, parameterized_class
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from quicktex.s3tc.bc1 import BC1Block, BC1Texture, BC1Encoder, BC1Decoder
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from .images import BC1Blocks
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from PIL import Image, ImageChops
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in_endpoints = ((253, 254, 255), (65, 70, 67)) # has some small changes that should encode the same
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out_endpoints = ((255, 255, 255, 255), (66, 69, 66, 255))
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selectors = [[0, 2, 3, 1]] * 4
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block_bytes = b'\xff\xff\x28\x42\x78\x78\x78\x78'
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class TestBC1Block(unittest.TestCase):
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"""Tests for the BC1Block class"""
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def test_size(self):
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"""Test the size and dimensions of BC1Block"""
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self.assertEqual(BC1Block.nbytes, 8, 'incorrect block size')
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self.assertEqual(BC1Block.width, 4, 'incorrect block width')
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self.assertEqual(BC1Block.height, 4, 'incorrect block width')
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self.assertEqual(BC1Block.size, (4, 4), 'incorrect block dimensions')
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def test_buffer(self):
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"""Test the buffer protocol of BC1Block"""
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block = BC1Block()
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mv = memoryview(block)
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self.assertFalse(mv.readonly, 'buffer is readonly')
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self.assertTrue(mv.c_contiguous, 'buffer is not contiguous')
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self.assertEqual(mv.ndim, 1, 'buffer is multidimensional')
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self.assertEqual(mv.nbytes, BC1Block.nbytes, 'buffer is the wrong size')
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self.assertEqual(mv.format, 'B', 'buffer has the wrong format')
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mv[:] = block_bytes
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self.assertEqual(mv.tobytes(), block_bytes, 'incorrect buffer data')
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def test_constructor(self):
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"""Test constructing a block out of endpoints and selectors"""
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block = BC1Block(*in_endpoints, selectors)
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self.assertEqual(block.tobytes(), block_bytes, 'incorrect block bytes')
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self.assertEqual(block.selectors, selectors, 'incorrect selectors')
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self.assertEqual(block.endpoints, out_endpoints, 'incorrect endpoints')
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self.assertFalse(block.is_3color, 'incorrect color mode')
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def test_frombytes(self):
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"""Test constructing a block out of raw data"""
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block = BC1Block.frombytes(block_bytes)
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self.assertEqual(block.tobytes(), block_bytes, 'incorrect block bytes')
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self.assertEqual(block.selectors, selectors, 'incorrect selectors')
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self.assertEqual(block.endpoints, out_endpoints, 'incorrect endpoints')
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self.assertFalse(block.is_3color, 'incorrect color mode')
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def test_eq(self):
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"""Test equality between two identical blocks"""
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block1 = BC1Block.frombytes(block_bytes)
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block2 = BC1Block.frombytes(block_bytes)
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self.assertEqual(block1, block2, 'identical blocks not equal')
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@parameterized_class(
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("name", "w", "h", "wb", "hb"), [("8x8", 8, 8, 2, 2), ("9x9", 9, 9, 3, 3), ("7x7", 7, 7, 2, 2), ("7x9", 7, 9, 2, 3)]
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)
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class TestBC1Texture(unittest.TestCase):
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def setUp(self):
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self.tex = BC1Texture(self.w, self.h)
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self.nbytes = self.wb * self.hb * BC1Block.nbytes
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def test_size(self):
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"""Test size of BC1Texture in bytes"""
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self.assertEqual(self.tex.nbytes, self.nbytes, 'incorrect texture size')
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self.assertEqual(len(self.tex.tobytes()), self.nbytes, 'incorrect texture size from tobytes')
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def test_dimensions(self):
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"""Test dimensions of BC1Texture in pixels"""
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self.assertEqual(self.tex.width, self.w, 'incorrect texture width')
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self.assertEqual(self.tex.height, self.h, 'incorrect texture height')
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self.assertEqual(self.tex.size, (self.w, self.h), 'incorrect texture dimensions')
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def test_dimensions_blocks(self):
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"""Test dimensions of BC1Texture in blocks"""
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self.assertEqual(self.tex.width_blocks, self.wb, 'incorrect texture width_blocks')
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self.assertEqual(self.tex.height_blocks, self.hb, 'incorrect texture width_blocks')
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self.assertEqual(self.tex.size_blocks, (self.wb, self.hb), 'incorrect texture dimensions_blocks')
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def test_blocks(self):
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"""Test getting and setting blocks to BC1Texture"""
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blocks = [[BC1Block.frombytes(bytes([x, y] + [0] * 6)) for x in range(self.wb)] for y in range(self.hb)]
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for x in range(self.wb):
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for y in range(self.hb):
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self.tex[x, y] = blocks[y][x]
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b = self.tex.tobytes()
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for x in range(self.wb):
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for y in range(self.hb):
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index = (x + (y * self.wb)) * BC1Block.nbytes
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tb = self.tex[x, y]
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fb = BC1Block.frombytes(b[index : index + BC1Block.nbytes])
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self.assertEqual(tb, blocks[y][x], 'incorrect block read from texture')
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self.assertEqual(fb, blocks[y][x], 'incorrect block read from texture bytes')
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self.assertEqual(self.tex[-1, -1], self.tex[self.wb - 1, self.hb - 1], 'incorrect negative subscripting')
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with self.assertRaises(IndexError):
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_ = self.tex[self.wb, self.hb]
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with self.assertRaises(IndexError):
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_ = self.tex[-1 - self.wb, -1 - self.hb]
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def test_buffer(self):
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"""Test the buffer protocol of BC1Texture"""
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mv = memoryview(self.tex)
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self.assertFalse(mv.readonly, 'buffer is readonly')
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self.assertTrue(mv.c_contiguous, 'buffer is not contiguous')
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self.assertEqual(mv.nbytes, self.nbytes, 'buffer is the wrong size')
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self.assertEqual(mv.format, 'B', 'buffer has the wrong format')
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data = block_bytes * self.wb * self.hb
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mv[:] = data
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self.assertEqual(mv.tobytes(), data, 'incorrect buffer data')
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@parameterized_class(
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("name", "color_mode"),
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[
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("4Color", BC1Encoder.ColorMode.FourColor),
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("3Color", BC1Encoder.ColorMode.ThreeColor),
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("3Color_Black", BC1Encoder.ColorMode.ThreeColorBlack),
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],
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)
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class TestBC1Encoder(unittest.TestCase):
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"""Test BC1Encoder"""
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@classmethod
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def setUpClass(cls):
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cls.bc1_encoder = BC1Encoder(5, cls.color_mode)
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def test_block_4color(self):
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"""Test encoder output with 4 color greyscale test block"""
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out_tex = self.bc1_encoder.encode(BC1Blocks.greyscale.texture)
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self.assertEqual(out_tex.size_blocks, (1, 1), 'encoded texture has multiple blocks')
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out_block = out_tex[0, 0]
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self.assertFalse(out_block.is_3color, 'returned 3color mode for greyscale test block')
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self.assertEqual(out_block, BC1Blocks.greyscale.block, 'encoded block is incorrect')
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def test_block_3color(self):
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"""Test encoder output with 3 color test block"""
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out_tex = self.bc1_encoder.encode(BC1Blocks.three_color.texture)
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self.assertEqual(out_tex.size_blocks, (1, 1), 'encoded texture has multiple blocks')
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out_block = out_tex[0, 0]
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if self.color_mode != BC1Encoder.ColorMode.FourColor:
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# we only care about the selectors if we are in 3 color mode
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self.assertTrue(out_block.is_3color, 'returned 4-color block for 3 color test block')
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self.assertEqual(out_block, BC1Blocks.three_color.block, 'encoded block is incorrect')
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else:
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self.assertFalse(out_block.is_3color, 'returned 3-color block in 4-color mode')
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def test_block_3color_black(self):
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"""Test encoder output with 3 color test block with black pixels"""
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out_tex = self.bc1_encoder.encode(BC1Blocks.three_color_black.texture)
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self.assertEqual(out_tex.size_blocks, (1, 1), 'encoded texture has multiple blocks')
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out_block = out_tex[0, 0]
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has_black = 3 in [j for row in out_block.selectors for j in row]
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if self.color_mode == BC1Encoder.ColorMode.ThreeColorBlack:
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# we only care about the selectors if we are in 3 color black mode
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self.assertTrue(out_block.is_3color, 'returned 4-color block for 3 color test block with black')
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self.assertTrue(has_black, 'block does not have black pixels as expected')
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self.assertEqual(out_block, BC1Blocks.three_color_black.block, "encoded block is incorrect")
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elif self.color_mode == BC1Encoder.ColorMode.ThreeColor:
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self.assertFalse(has_black and out_block.is_3color, 'returned 3color block with black pixels')
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else:
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self.assertFalse(out_block.is_3color, 'returned 3-color block in 4-color mode')
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class TestBC1Decoder(unittest.TestCase):
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"""Test BC1Decoder"""
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@classmethod
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def setUpClass(cls):
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cls.bc1_decoder = BC1Decoder()
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@parameterized.expand(
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[
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("4color", BC1Blocks.greyscale.block, BC1Blocks.greyscale.image),
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("3color", BC1Blocks.three_color.block, BC1Blocks.three_color.image),
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("3color_black", BC1Blocks.three_color_black.block, BC1Blocks.three_color_black.image),
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]
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)
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def test_block(self, _, block, image):
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"""Test decoder output for a single block"""
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in_tex = BC1Texture(4, 4)
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in_tex[0, 0] = block
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out_tex = self.bc1_decoder.decode(in_tex)
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self.assertEqual(out_tex.size, (4, 4), 'decoded texture has incorrect dimensions')
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out_img = Image.frombytes('RGBA', (4, 4), out_tex.tobytes())
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img_diff = ImageChops.difference(out_img, image).convert('L')
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img_hist = img_diff.histogram()
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self.assertEqual(16, img_hist[0], 'decoded block is incorrect')
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