diff options
Diffstat (limited to 'silx/gui/_glutils/font.py')
| -rw-r--r-- | silx/gui/_glutils/font.py | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/silx/gui/_glutils/font.py b/silx/gui/_glutils/font.py deleted file mode 100644 index 6a4c489..0000000 --- a/silx/gui/_glutils/font.py +++ /dev/null @@ -1,163 +0,0 @@ -# coding: utf-8 -# /*########################################################################## -# -# Copyright (c) 2016-2020 European Synchrotron Radiation Facility -# -# Permission is hereby granted, free of charge, to any person obtaining a copy -# of this software and associated documentation files (the "Software"), to deal -# in the Software without restriction, including without limitation the rights -# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell -# copies of the Software, and to permit persons to whom the Software is -# furnished to do so, subject to the following conditions: -# -# The above copyright notice and this permission notice shall be included in -# all copies or substantial portions of the Software. -# -# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR -# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, -# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE -# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER -# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, -# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN -# THE SOFTWARE. -# -# ###########################################################################*/ -"""Text rasterisation feature leveraging Qt font and text layout support.""" - -__authors__ = ["T. Vincent"] -__license__ = "MIT" -__date__ = "13/10/2016" - - -import logging -import numpy - -from ..utils.image import convertQImageToArray -from .. import qt - -_logger = logging.getLogger(__name__) - - -def getDefaultFontFamily(): - """Returns the default font family of the application""" - return qt.QApplication.instance().font().family() - - -# Font weights -ULTRA_LIGHT = 0 -"""Lightest characters: Minimum font weight""" - -LIGHT = 25 -"""Light characters""" - -NORMAL = 50 -"""Normal characters""" - -SEMI_BOLD = 63 -"""Between normal and bold characters""" - -BOLD = 74 -"""Thicker characters""" - -BLACK = 87 -"""Really thick characters""" - -ULTRA_BLACK = 99 -"""Thickest characters: Maximum font weight""" - - -def rasterText(text, font, - size=-1, - weight=-1, - italic=False, - devicePixelRatio=1.0): - """Raster text using Qt. - - It supports multiple lines. - - :param str text: The text to raster - :param font: Font name or QFont to use - :type font: str or :class:`QFont` - :param int size: - Font size in points - Used only if font is given as name. - :param int weight: - Font weight in [0, 99], see QFont.Weight. - Used only if font is given as name. - :param bool italic: - True for italic font (default: False). - Used only if font is given as name. - :param float devicePixelRatio: - The current ratio between device and device-independent pixel - (default: 1.0) - :return: Corresponding image in gray scale and baseline offset from top - :rtype: (HxW numpy.ndarray of uint8, int) - """ - if not text: - _logger.info("Trying to raster empty text, replaced by white space") - text = ' ' # Replace empty text by white space to produce an image - - if (devicePixelRatio != 1.0 and - not hasattr(qt.QImage, 'setDevicePixelRatio')): # Qt 4 - _logger.error('devicePixelRatio not supported') - devicePixelRatio = 1.0 - - if not isinstance(font, qt.QFont): - font = qt.QFont(font, size, weight, italic) - - # get text size - image = qt.QImage(1, 1, qt.QImage.Format_RGB888) - painter = qt.QPainter() - painter.begin(image) - painter.setPen(qt.Qt.white) - painter.setFont(font) - bounds = painter.boundingRect( - qt.QRect(0, 0, 4096, 4096), qt.Qt.TextExpandTabs, text) - painter.end() - - metrics = qt.QFontMetrics(font) - - # This does not provide the correct text bbox on macOS - # size = metrics.size(qt.Qt.TextExpandTabs, text) - # bounds = metrics.boundingRect( - # qt.QRect(0, 0, size.width(), size.height()), - # qt.Qt.TextExpandTabs, - # text) - - # Add extra border and handle devicePixelRatio - width = bounds.width() * devicePixelRatio + 2 - # align line size to 32 bits to ease conversion to numpy array - width = 4 * ((width + 3) // 4) - image = qt.QImage(int(width), - int(bounds.height() * devicePixelRatio + 2), - qt.QImage.Format_RGB888) - if (devicePixelRatio != 1.0 and - hasattr(image, 'setDevicePixelRatio')): # Qt 5 - image.setDevicePixelRatio(devicePixelRatio) - - # TODO if Qt5 use Format_Grayscale8 instead - image.fill(0) - - # Raster text - painter = qt.QPainter() - painter.begin(image) - painter.setPen(qt.Qt.white) - painter.setFont(font) - painter.drawText(bounds, qt.Qt.TextExpandTabs, text) - painter.end() - - array = convertQImageToArray(image) - - # RGB to R - array = numpy.ascontiguousarray(array[:, :, 0]) - - # Remove leading and trailing empty columns but one on each side - column_cumsum = numpy.cumsum(numpy.sum(array, axis=0)) - array = array[:, column_cumsum.argmin():column_cumsum.argmax() + 2] - - # Remove leading and trailing empty rows but one on each side - row_cumsum = numpy.cumsum(numpy.sum(array, axis=1)) - min_row = row_cumsum.argmin() - array = array[min_row:row_cumsum.argmax() + 2, :] - - return array, metrics.ascent() - min_row |