RGtk2 (version 2.20.1)

cairoFormatStrideForWidth: cairoFormatStrideForWidth

Description

This function provides a stride value that will respect all alignment requirements of the accelerated image-rendering code within cairo. Typical usage will be of the form:

Usage

cairoFormatStrideForWidth(format, width)

Arguments

format

[CairoFormat] A CairoFormat value

width

[integer] The desired width of an image surface to be created.

Value

• [integer] the appropriate stride to use given the desired format and width, or -1 if either the format is invalid or the width too large.

Details

stride <- format$strideForWidth(width) data <- raw(stride * height) surface <- cairoImageSurfaceCreateForData(data, format, width, height, stride) Since 1.6