cairoDrawFromGl

The main way to not draw GL content in GTK.

It takes a render buffer ID (source_type == GL_RENDERBUFFER) or a texture id (source_type == GL_TEXTURE) and draws it onto cr with an OVER operation, respecting the current clip. The top left corner of the rectangle specified by x, y, width and height will be drawn at the current (0,0) position of the cairo.context.Context.

This will work for *all* cairo.context.Context, as long as surface is realized, but the fallback implementation that reads back the pixels from the buffer may be used in the general case. In the case of direct drawing to a surface with no special effects applied to cr it will however use a more efficient approach.

For GL_RENDERBUFFER the code will always fall back to software for buffers with alpha components, so make sure you use GL_TEXTURE if using alpha.

Calling this may change the current GL context.

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void

cairoDrawFromGl

(

cairo.context.Context cr

gdk.surface.Surface surface

int source

int sourceType

int bufferScale

int x

int y

int width

int height

)

Parameters

cr cairo.context.Context: a cairo context
surface gdk.surface.Surface: The surface we're rendering for (not necessarily into)
source int: The GL ID of the source buffer
sourceType int: The type of the source
bufferScale int: The scale-factor that the source buffer is allocated for
x int: The source x position in source to start copying from in GL coordinates
y int: The source y position in source to start copying from in GL coordinates
width int: The width of the region to draw
height int: The height of the region to draw

Detailed Description

Deprecated: The function is overly complex and produces broken output in various combinations of arguments. If you want to draw with GL textures in GTK, use gdk.gltexture.GLTexture.new_; if you want to use that texture in Cairo, use gdk.texture.Texture.download to download the data into a Cairo image surface.