Method

GeglNodeblit

Declaration [src]

void
gegl_node_blit (
  GeglNode* node,
  gdouble scale,
  const GeglRectangle* roi,
  const Babl* format,
  gpointer destination_buf,
  gint rowstride,
  GeglBlitFlags flags
)

Description [src]

Render a rectangular region from a node.

This method is not directly available to language bindings.

Parameters

scale

Type: gdouble

The scale to render at 1.0 is default, other values changes the width/height of the sampled region.

roi

Type: GeglRectangle

The rectangle to render from the node, the coordinate system used is coordinates after scale has been applied.

The data is owned by the caller of the function.

format

Type: Babl

The BablFormat desired.

The data is owned by the caller of the function.

destination_buf

Type: gpointer

A memory buffer large enough to contain the data, can be left as NULL when forcing a rendering of a region.

The argument can be NULL.

The data is owned by the caller of the function.

rowstride

Type: gint

Rowstride in bytes, or GEGL_AUTO_ROWSTRIDE to compute the rowstride based on the width and bytes per pixel for the specified format.

flags

Type: GeglBlitFlags

An or’ed combination of GEGL_BLIT_DEFAULT, GEGL_BLIT_CACHE and GEGL_BLIT_DIRTY. if cache is enabled, a cache will be set up for subsequent requests of image data from this node. By passing in GEGL_BLIT_DIRTY the function will return with the latest rendered results in the cache without regard to wheter the regions has been rendered or not.