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Integration with other Libraries
================================
Pyglet & ImageSurface as Texture
--------------------------------
Creating a pyglet.Texture from an ImageSurface:
.. code:: python
import ctypes
import cairo
from pyglet import app, clock, gl, image, window
# create data shared by ImageSurface and Texture
width, height = 400, 400
surface_data = (ctypes.c_ubyte * (width * height * 4))()
surface = cairo.ImageSurface.create_for_data (surface_data, cairo.FORMAT_ARGB32,
width, height, width * 4);
texture = image.Texture.create_for_size(gl.GL_TEXTURE_2D, width, height, gl.GL_RGBA)
Draw pyglet.Texture bound to ImageSurface
.. code:: python
window = window.Window(width=width, height=height)
@window.event
def on_draw():
window.clear()
# Draw texture backed by ImageSurface
gl.glEnable(gl.GL_TEXTURE_2D)
gl.glBindTexture(gl.GL_TEXTURE_2D, texture.id)
gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, gl.GL_RGBA, width, height, 0, gl.GL_BGRA,
gl.GL_UNSIGNED_BYTE,
surface_data)
gl.glBegin(gl.GL_QUADS)
gl.glTexCoord2f(0.0, 1.0)
gl.glVertex2i(0, 0)
gl.glTexCoord2f(1.0, 1.0)
gl.glVertex2i(width, 0)
gl.glTexCoord2f(1.0, 0.0)
gl.glVertex2i(width, height)
gl.glTexCoord2f(0.0, 0.0)
gl.glVertex2i(0, height)
gl.glEnd()
# call clock.schedule_update here to update the ImageSurface every frame
app.run()
Freetype-py & Cairo
-------------------
See https://github.com/rougier/freetype-py/tree/master/examples for examples. Most of the ``*-cairo.py`` examples illustrate conversion from FreeType bitmaps to Cairo surfaces; the two examples, ``glyph-vector-cairo.py`` and ``glyph-vector-2-cairo.py``, illustrate conversion from FreeType glyph contours to Cairo paths.
ModernGL & ImageSurface as Texture
----------------------------------
Creating a moderngl.Texture from an ImageSurface:
.. code:: python
import moderngl
import cairo
ctx = moderngl.create_context(standalone=True)
width, height = 400, 400
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
texture = ctx.texture((width, height), 4, data=surface.get_data())
An example can also be found in the ModernGL project:
https://github.com/moderngl/moderngl/blob/master/examples/integration_pycairo.py
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