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What does content type of surface do in Cairo?

What does content type of surface do in Cairo?

This method must be called before switching from drawing on the Surface with cairo to drawing on it directly with native APIs. If the Surface doesn’t support direct access, then this function does nothing. The content type of Surface , which indicates whether the Surface contains color and/or alpha information.

How to get a pointer to the Cairo surface?

Get a pointer to the data of the image surface, for direct inspection or modification. A call to cairo_surface_flush () is required before accessing the pixel data to ensure that all pending drawing operations are finished. A call to cairo_surface_mark_dirty () is required after the data is modified.

How is a Cairo surface created in Java?

cairo_surface_tis the abstract type representing all different drawing targets that cairo can render to. The actual drawings are performed using a cairo context. A cairo surface is created by using backend-specific constructors, typically of the form cairo_backend_surface_create().

When to call Cairo _ surface Mark Dirty ( )?

A call to cairo_surface_mark_dirty () is required after the data is modified. a pointer to the image data of this surface or NULL if surface is not an image surface, or if cairo_surface_finish () has been called.

This method must be called before switching from drawing on the Surface with cairo to drawing on it directly with native APIs. If the Surface doesn’t support direct access, then this function does nothing. The content type of Surface , which indicates whether the Surface contains color and/or alpha information.

cairo_surface_tis the abstract type representing all different drawing targets that cairo can render to. The actual drawings are performed using a cairo context. A cairo surface is created by using backend-specific constructors, typically of the form cairo_backend_surface_create().

When to call Cairo _ surface _ destroy ( )?

The caller owns the surface and should call cairo_surface_destroy () when done with it. This function always returns a valid pointer, but it will return a pointer to a “nil” surface if other is already in an error state or any other error occurs. Create a new surface that is a rectangle within the target surface.

How are drawings performed in Pycairo using Cairo?

The actual drawings are performed using a Context. A cairo.Surface is created by using backend-specific constructors of the form cairo. Surface (). Surface is the abstract base class from which all the other surface classes derive. It cannot be instantiated directly.