Function
Gdkcairo_draw_from_gl
deprecated: 4.6
Declaration [src]
void
gdk_cairo_draw_from_gl (
cairo_t* cr,
GdkSurface* surface,
int source,
int source_type,
int buffer_scale,
int x,
int y,
int width,
int height
)
Description [src]
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_t.
This will work for all cairo_t, 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.
Deprecated since: 4.6
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_gl_texture_new(); if you want to use that texture in
Cairo, use gdk_texture_download() to download the data into a Cairo
image surface.
Parameters
cr-
Type:
cairo_tA cairo context.
The data is owned by the caller of the function. surface-
Type:
GdkSurfaceThe surface we’re rendering for (not necessarily into).
The data is owned by the caller of the function. source-
Type:
intThe GL ID of the source buffer.
source_type-
Type:
intThe type of the
source. buffer_scale-
Type:
intThe scale-factor that the
sourcebuffer is allocated for. x-
Type:
intThe source x position in
sourceto start copying from in GL coordinates. y-
Type:
intThe source y position in
sourceto start copying from in GL coordinates. width-
Type:
intThe width of the region to draw.
height-
Type:
intThe height of the region to draw.