RGtk2 (version 2.8.7)

gdkDrawRgbImageDithalign: gdkDrawRgbImageDithalign

Description

Draws an RGB image in the drawable, with an adjustment for dither alignment.

Usage

gdkDrawRgbImageDithalign(object, gc, x, y, width, height, dith, rgb.buf, xdith, ydith)

Details

This function is useful when drawing dithered images into a window that may be scrolled. Pixel (x, y) will be drawn dithered as if its actual location is (x + xdith, y + ydith). Thus, if you draw an image into a window using zero dither alignment, then scroll up one pixel, subsequent draws to the window should have ydith = 1. Setting the dither alignment correctly allows updating of small parts of the screen while avoiding visible "seams" between the different dither textures.