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# coding: utf-8
# /*##########################################################################
#
# Copyright (c) 2014-2020 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.
#
# ############################################################################*/
"""
This module provides a class to render 2D array as a colormap or RGB(A) image
"""
__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "03/04/2017"
import math
import numpy
from silx.math.combo import min_max
from ...._glutils import gl, Program, Texture
from ..._utils import FLOAT32_MINPOS
from .GLSupport import mat4Translate, mat4Scale
from .GLTexture import Image
from .GLPlotItem import GLPlotItem
class _GLPlotData2D(GLPlotItem):
def __init__(self, data, origin, scale):
super().__init__()
self.data = data
assert len(origin) == 2
self.origin = tuple(origin)
assert len(scale) == 2
self.scale = tuple(scale)
def pick(self, x, y):
if self.xMin <= x <= self.xMax and self.yMin <= y <= self.yMax:
ox, oy = self.origin
sx, sy = self.scale
col = int((x - ox) / sx)
row = int((y - oy) / sy)
return (row,), (col,)
else:
return None
@property
def xMin(self):
ox, sx = self.origin[0], self.scale[0]
return ox if sx >= 0. else ox + sx * self.data.shape[1]
@property
def yMin(self):
oy, sy = self.origin[1], self.scale[1]
return oy if sy >= 0. else oy + sy * self.data.shape[0]
@property
def xMax(self):
ox, sx = self.origin[0], self.scale[0]
return ox + sx * self.data.shape[1] if sx >= 0. else ox
@property
def yMax(self):
oy, sy = self.origin[1], self.scale[1]
return oy + sy * self.data.shape[0] if sy >= 0. else oy
class GLPlotColormap(_GLPlotData2D):
_SHADERS = {
'linear': {
'vertex': """
#version 120
uniform mat4 matrix;
attribute vec2 texCoords;
attribute vec2 position;
varying vec2 coords;
void main(void) {
coords = texCoords;
gl_Position = matrix * vec4(position, 0.0, 1.0);
}
""",
'fragTransform': """
vec2 textureCoords(void) {
return coords;
}
"""},
'log': {
'vertex': """
#version 120
attribute vec2 position;
uniform mat4 matrix;
uniform mat4 matOffset;
uniform bvec2 isLog;
varying vec2 coords;
const float oneOverLog10 = 0.43429448190325176;
void main(void) {
vec4 dataPos = matOffset * vec4(position, 0.0, 1.0);
if (isLog.x) {
dataPos.x = oneOverLog10 * log(dataPos.x);
}
if (isLog.y) {
dataPos.y = oneOverLog10 * log(dataPos.y);
}
coords = dataPos.xy;
gl_Position = matrix * dataPos;
}
""",
'fragTransform': """
uniform bvec2 isLog;
uniform vec2 bounds_oneOverRange;
uniform vec2 bounds_originOverRange;
vec2 textureCoords(void) {
vec2 pos = coords;
if (isLog.x) {
pos.x = pow(10., coords.x);
}
if (isLog.y) {
pos.y = pow(10., coords.y);
}
return pos * bounds_oneOverRange - bounds_originOverRange;
// TODO texture coords in range different from [0, 1]
}
"""},
'fragment': """
#version 120
/* isnan declaration for compatibility with GLSL 1.20 */
bool isnan(float value) {
return (value != value);
}
uniform sampler2D data;
uniform sampler2D cmap_texture;
uniform int cmap_normalization;
uniform float cmap_parameter;
uniform float cmap_min;
uniform float cmap_oneOverRange;
uniform float alpha;
uniform vec4 nancolor;
varying vec2 coords;
%s
const float oneOverLog10 = 0.43429448190325176;
void main(void) {
float data = texture2D(data, textureCoords()).r;
float value = data;
if (cmap_normalization == 1) { /*Logarithm mapping*/
if (value > 0.) {
value = clamp(cmap_oneOverRange *
(oneOverLog10 * log(value) - cmap_min),
0., 1.);
} else {
value = 0.;
}
} else if (cmap_normalization == 2) { /*Square root mapping*/
if (value >= 0.) {
value = clamp(cmap_oneOverRange * (sqrt(value) - cmap_min),
0., 1.);
} else {
value = 0.;
}
} else if (cmap_normalization == 3) { /*Gamma correction mapping*/
value = pow(
clamp(cmap_oneOverRange * (value - cmap_min), 0., 1.),
cmap_parameter);
} else if (cmap_normalization == 4) { /* arcsinh mapping */
/* asinh = log(x + sqrt(x*x + 1) for compatibility with GLSL 1.20 */
value = clamp(cmap_oneOverRange * (log(value + sqrt(value*value + 1.0)) - cmap_min), 0., 1.);
} else { /*Linear mapping and fallback*/
value = clamp(cmap_oneOverRange * (value - cmap_min), 0., 1.);
}
if (isnan(data)) {
gl_FragColor = nancolor;
} else {
gl_FragColor = texture2D(cmap_texture, vec2(value, 0.5));
}
gl_FragColor.a *= alpha;
}
"""
}
_DATA_TEX_UNIT = 0
_CMAP_TEX_UNIT = 1
_INTERNAL_FORMATS = {
numpy.dtype(numpy.float32): gl.GL_R32F,
numpy.dtype(numpy.float16): gl.GL_R16F,
# Use normalized integer for unsigned int formats
numpy.dtype(numpy.uint16): gl.GL_R16,
numpy.dtype(numpy.uint8): gl.GL_R8,
}
_linearProgram = Program(_SHADERS['linear']['vertex'],
_SHADERS['fragment'] %
_SHADERS['linear']['fragTransform'],
attrib0='position')
_logProgram = Program(_SHADERS['log']['vertex'],
_SHADERS['fragment'] %
_SHADERS['log']['fragTransform'],
attrib0='position')
SUPPORTED_NORMALIZATIONS = 'linear', 'log', 'sqrt', 'gamma', 'arcsinh'
def __init__(self, data, origin, scale,
colormap, normalization='linear', gamma=0., cmapRange=None,
alpha=1.0, nancolor=(1., 1., 1., 0.)):
"""Create a 2D colormap
:param data: The 2D scalar data array to display
:type data: numpy.ndarray with 2 dimensions (dtype=numpy.float32)
:param origin: (x, y) coordinates of the origin of the data array
:type origin: 2-tuple of floats.
:param scale: (sx, sy) scale factors of the data array.
This is the size of a data pixel in plot data space.
:type scale: 2-tuple of floats.
:param str colormap: Name of the colormap to use
TODO: Accept a 1D scalar array as the colormap
:param str normalization: The colormap normalization.
One of: 'linear', 'log', 'sqrt', 'gamma'
;param float gamma: The gamma parameter (for 'gamma' normalization)
:param cmapRange: The range of colormap or None for autoscale colormap
For logarithmic colormap, the range is in the untransformed data
TODO: check consistency with matplotlib
:type cmapRange: (float, float) or None
:param float alpha: Opacity from 0 (transparent) to 1 (opaque)
:param nancolor: RGBA color for Not-A-Number values
:type nancolor: 4-tuple of float in [0., 1.]
"""
assert data.dtype in self._INTERNAL_FORMATS
assert normalization in self.SUPPORTED_NORMALIZATIONS
super(GLPlotColormap, self).__init__(data, origin, scale)
self.colormap = numpy.array(colormap, copy=False)
self.normalization = normalization
self.gamma = gamma
self._cmapRange = (1., 10.) # Colormap range
self.cmapRange = cmapRange # Update _cmapRange
self._alpha = numpy.clip(alpha, 0., 1.)
self._nancolor = numpy.clip(nancolor, 0., 1.)
self._cmap_texture = None
self._texture = None
self._textureIsDirty = False
def discard(self):
if self._cmap_texture is not None:
self._cmap_texture.discard()
self._cmap_texture = None
if self._texture is not None:
self._texture.discard()
self._texture = None
self._textureIsDirty = False
@property
def cmapRange(self):
if self.normalization == 'log':
assert self._cmapRange[0] > 0. and self._cmapRange[1] > 0.
elif self.normalization == 'sqrt':
assert self._cmapRange[0] >= 0. and self._cmapRange[1] >= 0.
return self._cmapRange
@cmapRange.setter
def cmapRange(self, cmapRange):
assert len(cmapRange) == 2
assert cmapRange[0] <= cmapRange[1]
self._cmapRange = float(cmapRange[0]), float(cmapRange[1])
@property
def alpha(self):
return self._alpha
def updateData(self, data):
assert data.dtype in self._INTERNAL_FORMATS
oldData = self.data
self.data = data
if self._texture is not None:
if (self.data.shape != oldData.shape or
self.data.dtype != oldData.dtype):
self.discard()
else:
self._textureIsDirty = True
def prepare(self):
if self._cmap_texture is None:
# TODO share cmap texture accross Images
# put all cmaps in one texture
colormap = numpy.empty((16, 256, self.colormap.shape[1]),
dtype=self.colormap.dtype)
colormap[:] = self.colormap
format_ = gl.GL_RGBA if colormap.shape[-1] == 4 else gl.GL_RGB
self._cmap_texture = Texture(internalFormat=format_,
data=colormap,
format_=format_,
texUnit=self._CMAP_TEX_UNIT,
minFilter=gl.GL_NEAREST,
magFilter=gl.GL_NEAREST,
wrap=(gl.GL_CLAMP_TO_EDGE,
gl.GL_CLAMP_TO_EDGE))
self._cmap_texture.prepare()
if self._texture is None:
internalFormat = self._INTERNAL_FORMATS[self.data.dtype]
self._texture = Image(internalFormat,
self.data,
format_=gl.GL_RED,
texUnit=self._DATA_TEX_UNIT)
elif self._textureIsDirty:
self._textureIsDirty = True
self._texture.updateAll(format_=gl.GL_RED, data=self.data)
def _setCMap(self, prog):
dataMin, dataMax = self.cmapRange # If log, it is stricly positive
param = 0.
if self.data.dtype in (numpy.uint16, numpy.uint8):
# Using unsigned int as normalized integer in OpenGL
# So normalize range
maxInt = float(numpy.iinfo(self.data.dtype).max)
dataMin, dataMax = dataMin / maxInt, dataMax / maxInt
if self.normalization == 'log':
dataMin = math.log10(dataMin)
dataMax = math.log10(dataMax)
normID = 1
elif self.normalization == 'sqrt':
dataMin = math.sqrt(dataMin)
dataMax = math.sqrt(dataMax)
normID = 2
elif self.normalization == 'gamma':
# Keep dataMin, dataMax as is
param = self.gamma
normID = 3
elif self.normalization == 'arcsinh':
dataMin = numpy.arcsinh(dataMin)
dataMax = numpy.arcsinh(dataMax)
normID = 4
else: # Linear and fallback
normID = 0
gl.glUniform1i(prog.uniforms['cmap_texture'],
self._cmap_texture.texUnit)
gl.glUniform1i(prog.uniforms['cmap_normalization'], normID)
gl.glUniform1f(prog.uniforms['cmap_parameter'], param)
gl.glUniform1f(prog.uniforms['cmap_min'], dataMin)
if dataMax > dataMin:
oneOverRange = 1. / (dataMax - dataMin)
else:
oneOverRange = 0. # Fall-back
gl.glUniform1f(prog.uniforms['cmap_oneOverRange'], oneOverRange)
gl.glUniform4f(prog.uniforms['nancolor'], *self._nancolor)
self._cmap_texture.bind()
def _renderLinear(self, context):
"""Perform rendering when both axes have linear scales
:param RenderContext context: Rendering information
"""
self.prepare()
prog = self._linearProgram
prog.use()
gl.glUniform1i(prog.uniforms['data'], self._DATA_TEX_UNIT)
mat = numpy.dot(numpy.dot(context.matrix,
mat4Translate(*self.origin)),
mat4Scale(*self.scale))
gl.glUniformMatrix4fv(prog.uniforms['matrix'], 1, gl.GL_TRUE,
mat.astype(numpy.float32))
gl.glUniform1f(prog.uniforms['alpha'], self.alpha)
self._setCMap(prog)
self._texture.render(prog.attributes['position'],
prog.attributes['texCoords'],
self._DATA_TEX_UNIT)
def _renderLog10(self, context):
"""Perform rendering when one axis has log scale
:param RenderContext context: Rendering information
"""
xMin, yMin = self.xMin, self.yMin
if ((context.isXLog and xMin < FLOAT32_MINPOS) or
(context.isYLog and yMin < FLOAT32_MINPOS)):
# Do not render images that are partly or totally <= 0
return
self.prepare()
prog = self._logProgram
prog.use()
ox, oy = self.origin
gl.glUniform1i(prog.uniforms['data'], self._DATA_TEX_UNIT)
gl.glUniformMatrix4fv(prog.uniforms['matrix'], 1, gl.GL_TRUE,
context.matrix.astype(numpy.float32))
mat = numpy.dot(mat4Translate(ox, oy), mat4Scale(*self.scale))
gl.glUniformMatrix4fv(prog.uniforms['matOffset'], 1, gl.GL_TRUE,
mat.astype(numpy.float32))
gl.glUniform2i(prog.uniforms['isLog'], context.isXLog, context.isYLog)
ex = ox + self.scale[0] * self.data.shape[1]
ey = oy + self.scale[1] * self.data.shape[0]
xOneOverRange = 1. / (ex - ox)
yOneOverRange = 1. / (ey - oy)
gl.glUniform2f(prog.uniforms['bounds_originOverRange'],
ox * xOneOverRange, oy * yOneOverRange)
gl.glUniform2f(prog.uniforms['bounds_oneOverRange'],
xOneOverRange, yOneOverRange)
gl.glUniform1f(prog.uniforms['alpha'], self.alpha)
self._setCMap(prog)
try:
tiles = self._texture.tiles
except AttributeError:
raise RuntimeError("No texture, discard has already been called")
if len(tiles) > 1:
raise NotImplementedError(
"Image over multiple textures not supported with log scale")
texture, vertices, info = tiles[0]
texture.bind(self._DATA_TEX_UNIT)
posAttrib = prog.attributes['position']
stride = vertices.shape[-1] * vertices.itemsize
gl.glEnableVertexAttribArray(posAttrib)
gl.glVertexAttribPointer(posAttrib,
2,
gl.GL_FLOAT,
gl.GL_FALSE,
stride, vertices)
gl.glDrawArrays(gl.GL_TRIANGLE_STRIP, 0, len(vertices))
def render(self, context):
"""Perform rendering
:param RenderContext context: Rendering information
"""
if any((context.isXLog, context.isYLog)):
self._renderLog10(context)
else:
self._renderLinear(context)
# Unbind colormap texture
gl.glActiveTexture(gl.GL_TEXTURE0 + self._cmap_texture.texUnit)
gl.glBindTexture(self._cmap_texture.target, 0)
# image #######################################################################
class GLPlotRGBAImage(_GLPlotData2D):
_SHADERS = {
'linear': {
'vertex': """
#version 120
attribute vec2 position;
attribute vec2 texCoords;
uniform mat4 matrix;
varying vec2 coords;
void main(void) {
gl_Position = matrix * vec4(position, 0.0, 1.0);
coords = texCoords;
}
""",
'fragment': """
#version 120
uniform sampler2D tex;
uniform float alpha;
varying vec2 coords;
void main(void) {
gl_FragColor = texture2D(tex, coords);
gl_FragColor.a *= alpha;
}
"""},
'log': {
'vertex': """
#version 120
attribute vec2 position;
uniform mat4 matrix;
uniform mat4 matOffset;
uniform bvec2 isLog;
varying vec2 coords;
const float oneOverLog10 = 0.43429448190325176;
void main(void) {
vec4 dataPos = matOffset * vec4(position, 0.0, 1.0);
if (isLog.x) {
dataPos.x = oneOverLog10 * log(dataPos.x);
}
if (isLog.y) {
dataPos.y = oneOverLog10 * log(dataPos.y);
}
coords = dataPos.xy;
gl_Position = matrix * dataPos;
}
""",
'fragment': """
#version 120
uniform sampler2D tex;
uniform bvec2 isLog;
uniform vec2 bounds_oneOverRange;
uniform vec2 bounds_originOverRange;
uniform float alpha;
varying vec2 coords;
vec2 textureCoords(void) {
vec2 pos = coords;
if (isLog.x) {
pos.x = pow(10., coords.x);
}
if (isLog.y) {
pos.y = pow(10., coords.y);
}
return pos * bounds_oneOverRange - bounds_originOverRange;
// TODO texture coords in range different from [0, 1]
}
void main(void) {
gl_FragColor = texture2D(tex, textureCoords());
gl_FragColor.a *= alpha;
}
"""}
}
_DATA_TEX_UNIT = 0
_SUPPORTED_DTYPES = (numpy.dtype(numpy.float32),
numpy.dtype(numpy.uint8),
numpy.dtype(numpy.uint16))
_linearProgram = Program(_SHADERS['linear']['vertex'],
_SHADERS['linear']['fragment'],
attrib0='position')
_logProgram = Program(_SHADERS['log']['vertex'],
_SHADERS['log']['fragment'],
attrib0='position')
def __init__(self, data, origin, scale, alpha):
"""Create a 2D RGB(A) image from data
:param data: The 2D image data array to display
:type data: numpy.ndarray with 3 dimensions
(dtype=numpy.uint8 or numpy.float32)
:param origin: (x, y) coordinates of the origin of the data array
:type origin: 2-tuple of floats.
:param scale: (sx, sy) scale factors of the data array.
This is the size of a data pixel in plot data space.
:type scale: 2-tuple of floats.
:param float alpha: Opacity from 0 (transparent) to 1 (opaque)
"""
assert data.dtype in self._SUPPORTED_DTYPES
super(GLPlotRGBAImage, self).__init__(data, origin, scale)
self._texture = None
self._textureIsDirty = False
self._alpha = numpy.clip(alpha, 0., 1.)
@property
def alpha(self):
return self._alpha
def discard(self):
if self._texture is not None:
self._texture.discard()
self._texture = None
self._textureIsDirty = False
def updateData(self, data):
assert data.dtype in self._SUPPORTED_DTYPES
oldData = self.data
self.data = data
if self._texture is not None:
if self.data.shape != oldData.shape:
self.discard()
else:
self._textureIsDirty = True
def prepare(self):
if self._texture is None:
formatName = 'GL_RGBA' if self.data.shape[2] == 4 else 'GL_RGB'
format_ = getattr(gl, formatName)
if self.data.dtype == numpy.uint16:
formatName += '16' # Use sized internal format for uint16
internalFormat = getattr(gl, formatName)
self._texture = Image(internalFormat,
self.data,
format_=format_,
texUnit=self._DATA_TEX_UNIT)
elif self._textureIsDirty:
self._textureIsDirty = False
# We should check that internal format is the same
format_ = gl.GL_RGBA if self.data.shape[2] == 4 else gl.GL_RGB
self._texture.updateAll(format_=format_, data=self.data)
def _renderLinear(self, context):
"""Perform rendering with both axes having linear scales
:param RenderContext context: Rendering information
"""
self.prepare()
prog = self._linearProgram
prog.use()
gl.glUniform1i(prog.uniforms['tex'], self._DATA_TEX_UNIT)
mat = numpy.dot(numpy.dot(context.matrix, mat4Translate(*self.origin)),
mat4Scale(*self.scale))
gl.glUniformMatrix4fv(prog.uniforms['matrix'], 1, gl.GL_TRUE,
mat.astype(numpy.float32))
gl.glUniform1f(prog.uniforms['alpha'], self.alpha)
self._texture.render(prog.attributes['position'],
prog.attributes['texCoords'],
self._DATA_TEX_UNIT)
def _renderLog(self, context):
"""Perform rendering with axes having log scale
:param RenderContext context: Rendering information
"""
self.prepare()
prog = self._logProgram
prog.use()
ox, oy = self.origin
gl.glUniform1i(prog.uniforms['tex'], self._DATA_TEX_UNIT)
gl.glUniformMatrix4fv(prog.uniforms['matrix'], 1, gl.GL_TRUE,
context.matrix.astype(numpy.float32))
mat = numpy.dot(mat4Translate(ox, oy), mat4Scale(*self.scale))
gl.glUniformMatrix4fv(prog.uniforms['matOffset'], 1, gl.GL_TRUE,
mat.astype(numpy.float32))
gl.glUniform2i(prog.uniforms['isLog'], context.isXLog, context.isYLog)
gl.glUniform1f(prog.uniforms['alpha'], self.alpha)
ex = ox + self.scale[0] * self.data.shape[1]
ey = oy + self.scale[1] * self.data.shape[0]
xOneOverRange = 1. / (ex - ox)
yOneOverRange = 1. / (ey - oy)
gl.glUniform2f(prog.uniforms['bounds_originOverRange'],
ox * xOneOverRange, oy * yOneOverRange)
gl.glUniform2f(prog.uniforms['bounds_oneOverRange'],
xOneOverRange, yOneOverRange)
try:
tiles = self._texture.tiles
except AttributeError:
raise RuntimeError("No texture, discard has already been called")
if len(tiles) > 1:
raise NotImplementedError(
"Image over multiple textures not supported with log scale")
texture, vertices, info = tiles[0]
texture.bind(self._DATA_TEX_UNIT)
posAttrib = prog.attributes['position']
stride = vertices.shape[-1] * vertices.itemsize
gl.glEnableVertexAttribArray(posAttrib)
gl.glVertexAttribPointer(posAttrib,
2,
gl.GL_FLOAT,
gl.GL_FALSE,
stride, vertices)
gl.glDrawArrays(gl.GL_TRIANGLE_STRIP, 0, len(vertices))
def render(self, context):
"""Perform rendering
:param RenderContext context: Rendering information
"""
if any((context.isXLog, context.isYLog)):
self._renderLog(context)
else:
self._renderLinear(context)
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