mirror of
https://github.com/python-pillow/Pillow.git
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233 lines
7.0 KiB
Python
233 lines
7.0 KiB
Python
from __future__ import annotations
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import io
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from pathlib import Path
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import pytest
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from PIL import BmpImagePlugin, Image, _binary
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from .helper import (
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assert_image_equal,
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assert_image_equal_tofile,
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assert_image_similar_tofile,
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hopper,
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)
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def test_sanity(tmp_path: Path) -> None:
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def roundtrip(im: Image.Image) -> None:
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outfile = str(tmp_path / "temp.bmp")
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im.save(outfile, "BMP")
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with Image.open(outfile) as reloaded:
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reloaded.load()
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assert im.mode == reloaded.mode
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assert im.size == reloaded.size
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assert reloaded.format == "BMP"
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assert reloaded.get_format_mimetype() == "image/bmp"
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roundtrip(hopper())
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roundtrip(hopper("1"))
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roundtrip(hopper("L"))
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roundtrip(hopper("P"))
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roundtrip(hopper("RGB"))
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def test_invalid_file() -> None:
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with open("Tests/images/flower.jpg", "rb") as fp:
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with pytest.raises(SyntaxError):
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BmpImagePlugin.BmpImageFile(fp)
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def test_fallback_if_mmap_errors() -> None:
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# This image has been truncated,
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# so that the buffer is not large enough when using mmap
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with Image.open("Tests/images/mmap_error.bmp") as im:
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assert_image_equal_tofile(im, "Tests/images/pal8_offset.bmp")
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def test_save_to_bytes() -> None:
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output = io.BytesIO()
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im = hopper()
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im.save(output, "BMP")
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output.seek(0)
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with Image.open(output) as reloaded:
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assert im.mode == reloaded.mode
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assert im.size == reloaded.size
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assert reloaded.format == "BMP"
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def test_small_palette(tmp_path: Path) -> None:
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im = Image.new("P", (1, 1))
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colors = [0, 0, 0, 125, 125, 125, 255, 255, 255]
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im.putpalette(colors)
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out = str(tmp_path / "temp.bmp")
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im.save(out)
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with Image.open(out) as reloaded:
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assert reloaded.getpalette() == colors
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def test_save_too_large(tmp_path: Path) -> None:
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outfile = str(tmp_path / "temp.bmp")
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with Image.new("RGB", (1, 1)) as im:
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im._size = (37838, 37838)
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with pytest.raises(ValueError):
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im.save(outfile)
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def test_dpi() -> None:
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dpi = (72, 72)
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output = io.BytesIO()
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with hopper() as im:
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im.save(output, "BMP", dpi=dpi)
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output.seek(0)
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with Image.open(output) as reloaded:
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assert reloaded.info["dpi"] == (72.008961115161, 72.008961115161)
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def test_save_bmp_with_dpi(tmp_path: Path) -> None:
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# Test for #1301
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# Arrange
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outfile = str(tmp_path / "temp.jpg")
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with Image.open("Tests/images/hopper.bmp") as im:
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assert im.info["dpi"] == (95.98654816726399, 95.98654816726399)
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# Act
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im.save(outfile, "JPEG", dpi=im.info["dpi"])
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# Assert
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with Image.open(outfile) as reloaded:
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reloaded.load()
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assert reloaded.info["dpi"] == (96, 96)
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assert reloaded.size == im.size
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assert reloaded.format == "JPEG"
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def test_save_float_dpi(tmp_path: Path) -> None:
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outfile = str(tmp_path / "temp.bmp")
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with Image.open("Tests/images/hopper.bmp") as im:
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im.save(outfile, dpi=(72.21216100543306, 72.21216100543306))
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with Image.open(outfile) as reloaded:
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assert reloaded.info["dpi"] == (72.21216100543306, 72.21216100543306)
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def test_load_dib() -> None:
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# test for #1293, Imagegrab returning Unsupported Bitfields Format
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with Image.open("Tests/images/clipboard.dib") as im:
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assert im.format == "DIB"
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assert im.get_format_mimetype() == "image/bmp"
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assert_image_equal_tofile(im, "Tests/images/clipboard_target.png")
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@pytest.mark.parametrize(
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"header_size, path",
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(
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(12, "g/pal8os2.bmp"),
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(40, "g/pal1.bmp"),
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(52, "q/rgb32h52.bmp"),
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(56, "q/rgba32h56.bmp"),
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(64, "q/pal8os2v2.bmp"),
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(108, "g/pal8v4.bmp"),
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(124, "g/pal8v5.bmp"),
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),
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)
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def test_dib_header_size(header_size: int, path: str) -> None:
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image_path = "Tests/images/bmp/" + path
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with open(image_path, "rb") as fp:
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data = fp.read()[14:]
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assert _binary.i32le(data) == header_size
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dib = io.BytesIO(data)
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with Image.open(dib) as im:
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im.load()
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def test_save_dib(tmp_path: Path) -> None:
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outfile = str(tmp_path / "temp.dib")
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with Image.open("Tests/images/clipboard.dib") as im:
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im.save(outfile)
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with Image.open(outfile) as reloaded:
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assert reloaded.format == "DIB"
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assert reloaded.get_format_mimetype() == "image/bmp"
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assert_image_equal(im, reloaded)
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def test_rgba_bitfields() -> None:
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# This test image has been manually hexedited
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# to change the bitfield compression in the header from XBGR to RGBA
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with Image.open("Tests/images/rgb32bf-rgba.bmp") as bmp_im:
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# So before the comparing the image, swap the channels
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b, g, r = bmp_im.split()[1:]
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im = Image.merge("RGB", (r, g, b))
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assert_image_equal_tofile(im, "Tests/images/bmp/q/rgb32bf-xbgr.bmp")
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# This test image has been manually hexedited
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# to change the bitfield compression in the header from XBGR to ABGR
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with Image.open("Tests/images/rgb32bf-abgr.bmp") as im:
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assert_image_equal_tofile(
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im.convert("RGB"), "Tests/images/bmp/q/rgb32bf-xbgr.bmp"
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)
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def test_rle8() -> None:
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with Image.open("Tests/images/hopper_rle8.bmp") as im:
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assert_image_similar_tofile(im.convert("RGB"), "Tests/images/hopper.bmp", 12)
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with Image.open("Tests/images/hopper_rle8_grayscale.bmp") as im:
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assert_image_equal_tofile(im, "Tests/images/bw_gradient.png")
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# This test image has been manually hexedited
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# to have rows with too much data
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with Image.open("Tests/images/hopper_rle8_row_overflow.bmp") as im:
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assert_image_similar_tofile(im.convert("RGB"), "Tests/images/hopper.bmp", 12)
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# Signal end of bitmap before the image is finished
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with open("Tests/images/bmp/g/pal8rle.bmp", "rb") as fp:
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data = fp.read(1063) + b"\x01"
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with Image.open(io.BytesIO(data)) as im:
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with pytest.raises(ValueError):
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im.load()
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def test_rle4() -> None:
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with Image.open("Tests/images/bmp/g/pal4rle.bmp") as im:
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assert_image_similar_tofile(im, "Tests/images/bmp/g/pal4.bmp", 12)
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@pytest.mark.parametrize(
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"file_name,length",
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(
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# EOF immediately after the header
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("Tests/images/hopper_rle8.bmp", 1078),
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# EOF during delta
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("Tests/images/bmp/q/pal8rletrns.bmp", 3670),
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# EOF when reading data in absolute mode
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("Tests/images/bmp/g/pal8rle.bmp", 1064),
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),
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)
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def test_rle8_eof(file_name: str, length: int) -> None:
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with open(file_name, "rb") as fp:
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data = fp.read(length)
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with Image.open(io.BytesIO(data)) as im:
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with pytest.raises(ValueError):
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im.load()
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def test_offset() -> None:
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# This image has been hexedited
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# to exclude the palette size from the pixel data offset
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with Image.open("Tests/images/pal8_offset.bmp") as im:
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assert_image_equal_tofile(im, "Tests/images/bmp/g/pal8.bmp")
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