Perform a sampling with the provided this.
| this |
a GeglSampler gotten from gegl_buffer_sampler_new |
| x |
x coordinate to sample |
| y |
y coordinate to sample |
| scale |
matrix representing extent of sampling area in source buffer. |
| output |
memory location for output data. |
| repeat_mode |
how requests outside the buffer extent are handled. Valid values: GEGL_ABYSS_NONE (abyss pixels are zeroed), GEGL_ABYSS_WHITE ( abyss pixels are white), GEGL_ABYSS_BLACK (abyss pixels are black), GEGL_ABYSS_CLAMP (coordinates are clamped to the abyss rectangle ), GEGL_ABYSS_LOOP (buffer contents are tiled if outside of the abyss rectangle). |