#!/usr/bin/python2.4
import cairo, sys
def text_to_image(text, font, size=72):
text = text[:100]
size = min(100, size)
surface = cairo.ImageSurface(cairo.FORMAT_A1, 1, 1)
ctx = cairo.Context(surface)
ctx.select_font_face(font)
ctx.set_font_size(size)
x_bearing, y_bearing, twidth, theight = ctx.text_extents(text)[:4]
descent = ctx.font_extents()[1]
del surface
del ctx
width = min(int(twidth+x_bearing+8), 1200)
height = min(int(theight+descent+8), 200)
surface = cairo.ImageSurface(cairo.FORMAT_RGB24, width, height)
ctx = cairo.Context(surface)
# First, clear the surface to white
ctx.set_source_rgba(1, 1, 1, 1)
ctx.rectangle(0, 0, width, height)
ctx.fill()
# Put a fine grey line around the outside
ctx.set_source_rgba(0, 0, 0, .25)
ctx.rectangle(0, 0, width, height)
ctx.stroke()
# Set the font
ctx.select_font_face(font)
ctx.set_font_size(size)
# And draw the desired letters
ctx.set_source_rgb(0, 0, 0)
ctx.move_to(-x_bearing+4, theight+4)
ctx.show_text(text)
return surface
def main():
import cgi, cgitb; cgitb.enable()
f = cgi.FieldStorage()
if f.has_key('text') and f.has_key('font'):
try:
size = int(f['size'].value)
except StandardError:
size = 72
text = f['text'].value
font = f['font'].value
surface = text_to_image(text, font, size)
sys.stdout.write("Content-Type: image/png\r\n\r\n")
surface.write_to_png(sys.stdout)
else:
fonts = ['Sans', 'Serif', 'Courier']
fonts = "".join("" % (cgi.escape(i)) for i in fonts)
sizes = "".join("" % i for i in range(12, 101, 4))
sys.stdout.write("Content-Type: text/html\r\n\r\n")
sys.stdout.write("""
Python/Cairo Text to Image demo
""" % (fonts, sizes))
main()