import io import pytest from PIL import BmpImagePlugin, Image from .helper import assert_image_equal, assert_image_equal_tofile, hopper def test_sanity(tmp_path): def roundtrip(im): outfile = str(tmp_path / "temp.bmp") im.save(outfile, "BMP") with Image.open(outfile) as reloaded: reloaded.load() assert im.mode == reloaded.mode assert im.size == reloaded.size assert reloaded.format == "BMP" assert reloaded.get_format_mimetype() == "image/bmp" roundtrip(hopper()) roundtrip(hopper("1")) roundtrip(hopper("L")) roundtrip(hopper("P")) roundtrip(hopper("RGB")) def test_invalid_file(): with open("Tests/images/flower.jpg", "rb") as fp: with pytest.raises(SyntaxError): BmpImagePlugin.BmpImageFile(fp) def test_save_to_bytes(): output = io.BytesIO() im = hopper() im.save(output, "BMP") output.seek(0) with Image.open(output) as reloaded: assert im.mode == reloaded.mode assert im.size == reloaded.size assert reloaded.format == "BMP" def test_save_too_large(tmp_path): outfile = str(tmp_path / "temp.bmp") with Image.new("RGB", (1, 1)) as im: im._size = (37838, 37838) with pytest.raises(ValueError): im.save(outfile) def test_dpi(): dpi = (72, 72) output = io.BytesIO() with hopper() as im: im.save(output, "BMP", dpi=dpi) output.seek(0) with Image.open(output) as reloaded: assert reloaded.info["dpi"] == dpi def test_save_bmp_with_dpi(tmp_path): # Test for #1301 # Arrange outfile = str(tmp_path / "temp.jpg") with Image.open("Tests/images/hopper.bmp") as im: # Act im.save(outfile, "JPEG", dpi=im.info["dpi"]) # Assert with Image.open(outfile) as reloaded: reloaded.load() assert im.info["dpi"] == reloaded.info["dpi"] assert im.size == reloaded.size assert reloaded.format == "JPEG" def test_load_dpi_rounding(): # Round up with Image.open("Tests/images/hopper.bmp") as im: assert im.info["dpi"] == (96, 96) # Round down with Image.open("Tests/images/hopper_roundDown.bmp") as im: assert im.info["dpi"] == (72, 72) def test_save_dpi_rounding(tmp_path): outfile = str(tmp_path / "temp.bmp") with Image.open("Tests/images/hopper.bmp") as im: im.save(outfile, dpi=(72.2, 72.2)) with Image.open(outfile) as reloaded: assert reloaded.info["dpi"] == (72, 72) im.save(outfile, dpi=(72.8, 72.8)) with Image.open(outfile) as reloaded: assert reloaded.info["dpi"] == (73, 73) def test_load_dib(): # test for #1293, Imagegrab returning Unsupported Bitfields Format with Image.open("Tests/images/clipboard.dib") as im: assert im.format == "DIB" assert im.get_format_mimetype() == "image/bmp" assert_image_equal_tofile(im, "Tests/images/clipboard_target.png") def test_save_dib(tmp_path): outfile = str(tmp_path / "temp.dib") with Image.open("Tests/images/clipboard.dib") as im: im.save(outfile) with Image.open(outfile) as reloaded: assert reloaded.format == "DIB" assert reloaded.get_format_mimetype() == "image/bmp" assert_image_equal(im, reloaded) def test_rgba_bitfields(): # This test image has been manually hexedited # to change the bitfield compression in the header from XBGR to RGBA with Image.open("Tests/images/rgb32bf-rgba.bmp") as im: # So before the comparing the image, swap the channels b, g, r = im.split()[1:] im = Image.merge("RGB", (r, g, b)) assert_image_equal_tofile(im, "Tests/images/bmp/q/rgb32bf-xbgr.bmp")