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# coding: utf-8
# /*##########################################################################
#
# Copyright (c) 2014-2018 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.
#
# ############################################################################*/
"""
This module provides minimalistic text support for OpenGL.
It provides Latin-1 (ISO8859-1) characters for one monospace font at one size.
"""
__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "03/04/2017"
from collections import OrderedDict
import numpy
from ...._glutils import font, gl, getGLContext, Program, Texture
from .GLSupport import mat4Translate
# TODO: Font should be configurable by the main program: using mpl.rcParams?
class _Cache(object):
"""LRU (Least Recent Used) cache.
:param int maxsize: Maximum number of (key, value) pairs in the cache
:param callable callback:
Called when a (key, value) pair is removed from the cache.
It must take 2 arguments: key and value.
"""
def __init__(self, maxsize=128, callback=None):
self._maxsize = int(maxsize)
self._callback = callback
self._cache = OrderedDict()
def __contains__(self, item):
return item in self._cache
def __getitem__(self, key):
if key in self._cache:
# Remove/add key from ordered dict to store last access info
value = self._cache.pop(key)
self._cache[key] = value
return value
else:
raise KeyError
def __setitem__(self, key, value):
"""Add a key, value pair to the cache.
:param key: The key to set
:param value: The corresponding value
"""
if key not in self._cache and len(self._cache) >= self._maxsize:
removedKey, removedValue = self._cache.popitem(last=False)
if self._callback is not None:
self._callback(removedKey, removedValue)
self._cache[key] = value
# Text2D ######################################################################
LEFT, CENTER, RIGHT = 'left', 'center', 'right'
TOP, BASELINE, BOTTOM = 'top', 'baseline', 'bottom'
ROTATE_90, ROTATE_180, ROTATE_270 = 90, 180, 270
class Text2D(object):
_SHADERS = {
'vertex': """
#version 120
attribute vec2 position;
attribute vec2 texCoords;
uniform mat4 matrix;
varying vec2 vCoords;
void main(void) {
gl_Position = matrix * vec4(position, 0.0, 1.0);
vCoords = texCoords;
}
""",
'fragment': """
#version 120
uniform sampler2D texText;
uniform vec4 color;
uniform vec4 bgColor;
varying vec2 vCoords;
void main(void) {
gl_FragColor = mix(bgColor, color, texture2D(texText, vCoords).r);
}
"""
}
_TEX_COORDS = numpy.array(((0., 0.), (1., 0.), (0., 1.), (1., 1.)),
dtype=numpy.float32).ravel()
_program = Program(_SHADERS['vertex'],
_SHADERS['fragment'],
attrib0='position')
# Discard texture objects when removed from the cache
_textures = _Cache(callback=lambda key, value: value[0].discard())
"""Cache already created textures"""
_sizes = _Cache()
"""Cache already computed sizes"""
def __init__(self, text, x=0, y=0,
color=(0., 0., 0., 1.),
bgColor=None,
align=LEFT, valign=BASELINE,
rotate=0):
self._vertices = None
self._text = text
self.x = x
self.y = y
self.color = color
self.bgColor = bgColor
if align not in (LEFT, CENTER, RIGHT):
raise ValueError(
"Horizontal alignment not supported: {0}".format(align))
self._align = align
if valign not in (TOP, CENTER, BASELINE, BOTTOM):
raise ValueError(
"Vertical alignment not supported: {0}".format(valign))
self._valign = valign
self._rotate = numpy.radians(rotate)
def _getTexture(self, text):
key = getGLContext(), text
if key not in self._textures:
image, offset = font.rasterText(text,
font.getDefaultFontFamily())
if text not in self._sizes:
self._sizes[text] = image.shape[1], image.shape[0]
self._textures[key] = (
Texture(gl.GL_RED,
data=image,
minFilter=gl.GL_NEAREST,
magFilter=gl.GL_NEAREST,
wrap=(gl.GL_CLAMP_TO_EDGE,
gl.GL_CLAMP_TO_EDGE)),
offset)
return self._textures[key]
@property
def text(self):
return self._text
@property
def size(self):
if self.text not in self._sizes:
image, offset = font.rasterText(self.text,
font.getDefaultFontFamily())
self._sizes[self.text] = image.shape[1], image.shape[0]
return self._sizes[self.text]
def getVertices(self, offset, shape):
height, width = shape
if self._align == LEFT:
xOrig = 0
elif self._align == RIGHT:
xOrig = - width
else: # CENTER
xOrig = - width // 2
if self._valign == BASELINE:
yOrig = - offset
elif self._valign == TOP:
yOrig = 0
elif self._valign == BOTTOM:
yOrig = - height
else: # CENTER
yOrig = - height // 2
vertices = numpy.array((
(xOrig, yOrig),
(xOrig + width, yOrig),
(xOrig, yOrig + height),
(xOrig + width, yOrig + height)), dtype=numpy.float32)
cos, sin = numpy.cos(self._rotate), numpy.sin(self._rotate)
vertices = numpy.ascontiguousarray(numpy.transpose(numpy.array((
cos * vertices[:, 0] - sin * vertices[:, 1],
sin * vertices[:, 0] + cos * vertices[:, 1]),
dtype=numpy.float32)))
return vertices
def render(self, matrix):
if not self.text:
return
prog = self._program
prog.use()
texUnit = 0
texture, offset = self._getTexture(self.text)
gl.glUniform1i(prog.uniforms['texText'], texUnit)
mat = numpy.dot(matrix, mat4Translate(int(self.x), int(self.y)))
gl.glUniformMatrix4fv(prog.uniforms['matrix'], 1, gl.GL_TRUE,
mat.astype(numpy.float32))
gl.glUniform4f(prog.uniforms['color'], *self.color)
if self.bgColor is not None:
bgColor = self.bgColor
else:
bgColor = self.color[0], self.color[1], self.color[2], 0.
gl.glUniform4f(prog.uniforms['bgColor'], *bgColor)
vertices = self.getVertices(offset, texture.shape)
posAttrib = prog.attributes['position']
gl.glEnableVertexAttribArray(posAttrib)
gl.glVertexAttribPointer(posAttrib,
2,
gl.GL_FLOAT,
gl.GL_FALSE,
0,
vertices)
texAttrib = prog.attributes['texCoords']
gl.glEnableVertexAttribArray(texAttrib)
gl.glVertexAttribPointer(texAttrib,
2,
gl.GL_FLOAT,
gl.GL_FALSE,
0,
self._TEX_COORDS)
with texture:
gl.glDrawArrays(gl.GL_TRIANGLE_STRIP, 0, 4)
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