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neon.py
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neon.py
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#!/usr/bin/env python3
import argparse
import array
import cairo
from PIL import ImageFilter, Image
from tools import transform_color
class NeonGlowText:
"""Neon glow text"""
MIN_FONT_SIZE = 20
MAX_FONT_SIZE = 300
MAX_PADDING = 120
MIN_SHADOW = 20
FONT = "Tomorrow"
BG_COLOR = 'ffffff'
GLOW_COLOR = '66b4ff' #(0.929, 0.055, 0.467)
FG_COLOR_1 = '1588c9' #(1, 0.196, 0.957)
FG_COLOR_2 = '40b2f3' #(1, 0.847, 0.592)
FILL_COLOR = 'ff5733'
'''BG_COLOR = '000000'
GLOW_COLOR = 'ec0e77' #(0.929, 0.055, 0.467)
FG_COLOR_1 = 'ff31f4' #(1, 0.196, 0.957)
FG_COLOR_2 = 'ffd796' #(1, 0.847, 0.592)
FILL_COLOR = 'FFFFFF'''
def __init__(self, args_dict):
self.text = args_dict.get('text')
self.filename = args_dict.get('filename')
self.width = args_dict.get('width')
self.height = args_dict.get('height')
self.font = args_dict.get('font')
self.font_size = None
self.bg_color = args_dict.get('bg_color')
self.glow_color = args_dict.get('glow_color')
self.fill_color = args_dict.get('fill_color')
self.stroke_1_color = args_dict.get('stroke_1_color')
self.stroke_2_color = args_dict.get('stroke_2_color')
def draw(self):
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, self.width, self.height)
cr = cairo.Context(surface)
self._set_font(cr)
self._move_to_center(cr)
self._paint_bg(cr)
cr.text_path(self.text)
self._draw_glow(cr)
surface = self._blur(surface, 35)
cr = cairo.Context(surface)
self._set_font(cr)
self._move_to_center(cr)
cr.text_path(self.text)
self._draw_neon(cr)
surface.write_to_png(self.filename)
def _set_font(self, cr):
cr.select_font_face(self.font, cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_NORMAL)
if self.font_size:
cr.set_font_size(self.font_size)
return
# Let's find an appropriate font size...
f_size = self.MAX_FONT_SIZE
while True:
cr.set_font_size(f_size)
_, _, t_width, t_height, _, _ = cr.text_extents(self.text)
# Check if text is within the desired boundaries
if (
t_width <= self.width - min(self.MAX_PADDING, f_size)
and t_height <= self.height - min(self.MAX_PADDING, f_size)
or f_size <= self.MIN_FONT_SIZE
):
break
f_size -= 2
self.font_size = f_size
def _move_to_center(self, cr):
cr.select_font_face(self.font, cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_NORMAL)
cr.set_font_size(self.font_size)
x_bearing, y_bearing, t_width, t_height, _, _ = cr.text_extents(self.text)
x = self.width / 2 - (t_width / 2 + x_bearing)
y = self.height / 2 - (t_height / 2 + y_bearing)
cr.move_to(x, y)
def _paint_bg(self, cr):
cr.set_source_rgb(*transform_color(self.bg_color))
cr.paint()
def _draw_glow(self, cr):
stroke_width = max(self.font_size / 3, self.MIN_SHADOW)
self._draw_stroke(cr, self.glow_color, stroke_width)
self._fill(cr, self.fill_color)
def _draw_stroke(self, cr, rgb, stroke_width):
cr.set_source_rgb(*transform_color(rgb))
cr.set_line_width(stroke_width)
cr.stroke_preserve()
def _fill(self, cr, rgb):
cr.set_source_rgb(*transform_color(rgb))
cr.fill()
def _draw_neon(self, cr):
self._draw_stroke(cr, self.stroke_1_color, 10 if self.font_size > 100 else 5)
self._draw_stroke(cr, self.stroke_2_color, 5 if self.font_size > 100 else 2)
self._fill(cr, self.fill_color)
def _blur(self, surface, blur_amount):
# Load as PIL Image
bg_image = Image.frombuffer("RGBA",( surface.get_width(), surface.get_height() ), surface.get_data(), "raw", "RGBA", 0, 1)
# Apply blur
blurred_image = bg_image.filter(ImageFilter.GaussianBlur(blur_amount))
# Restore cairo surface
image_bytes = blurred_image.tobytes()
image_array = array.array('B', image_bytes)
stride = cairo.ImageSurface.format_stride_for_width(cairo.FORMAT_ARGB32, self.width)
return surface.create_for_data(image_array, cairo.FORMAT_ARGB32, self.width, self.height, stride)
def main():
args = _parse_arguments()
neon_text = NeonGlowText(args)
neon_text.draw()
def _parse_arguments():
parser = argparse.ArgumentParser(
description='Creates a neon glow effect image with the given text')
parser.add_argument('-t', '--text',
help='Text to render',
required=True)
parser.add_argument('-f', '--filename',
help='Image filename (png)',
required=True)
parser.add_argument('--width',
help='Image width in pixels',
type=int,
default=1920)
parser.add_argument('--height',
help='Image height in pixels',
type=int,
default=1080)
parser.add_argument('--font',
help='Font name',
default=NeonGlowText.FONT)
parser.add_argument('-bc', '--bg-color',
help='Image background color in hex (e.g. 020202)',
default=NeonGlowText.BG_COLOR)
parser.add_argument('-gc', '--glow-color',
help='Text glow color in hex (e.g. EC0E77)',
default=NeonGlowText.GLOW_COLOR)
parser.add_argument('-fc', '--fill-color',
help='Text fill color in hex (e.g. FFFFFF)',
default=NeonGlowText.FILL_COLOR)
parser.add_argument('-s1c', '--stroke-1-color',
help='Text stroke 1 color in hex (e.g. FF31F4)',
default=NeonGlowText.FG_COLOR_1)
parser.add_argument('-s2c', '--stroke-2-color',
help='Text stroke 2 color in hex (e.g. FFD796)',
default=NeonGlowText.FG_COLOR_2)
return vars(parser.parse_args())
if __name__ == '__main__':
main()