Accurate aspect ratio

Here is an example that outputs the image in the correct aspect ratio.

from chafa import *
from chafa.loader import Loader

FONT_WIDTH  = 11
FONT_HEIGHT = 24

# Init canvas config
config = CanvasConfig()

# Set canvas height, width and cell geometry
config.height = 30
config.width  = 30

# Set the canvas cell geometry
config.cell_height = FONT_HEIGHT
config.cell_width  = FONT_WIDTH

# Open image with the loader
image = Loader("./snake.jpg")

width      = image.width
height     = image.height
rowstride  = image.rowstride

# Calculate the appropriate geometry for the canvas
config.calc_canvas_geometry(width, height, FONT_WIDTH/FONT_HEIGHT)

# Init the canvas
canvas = Canvas(config)

# Draw to canvas
canvas.draw_all_pixels(
    image.pixel_type,
    image.get_pixels(),
    width,
    height,
    rowstride
)

# Write picture
print(canvas.print().decode())