gdkDrawRgbImageDithalign {RGtk2} | R Documentation

## 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)

### Arguments

``object`` | The `GdkDrawable` to draw in (usually a `GdkWindow`).
``gc`` | The graphics context.
``x`` | The x coordinate of the top-left corner in the drawable.
``y`` | The y coordinate of the top-left corner in the drawable.
``width`` | The width of the rectangle to be drawn.
``height`` | The height of the rectangle to be drawn.
``dith`` | A `GdkRgbDither` value, selecting the desired dither mode.
``rgb.buf`` | The pixel data, represented as packed 24-bit data.
``xdith`` | An x offset for dither alignment.
``ydith`` | A y offset for dither alignment.

### 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.

### Author(s)

Derived by RGtkGen from GTK+ documentation

[Package RGtk2 version 2.20.40 Index]