col_to_int

Packed RGBA values are used in R's native raster objects.

Color values in R are often represented as strings of hexadecimal
colors or named colors. This package offers fast conversion of
these color representations to either an array of red/green/blue/alpha values
or to the packed integer format used in native raster objects. Functions
for conversion are also exported at the 'C' level for use in other packages.
This fast conversion
of colors is implemented using an order-preserving minimal perfect hash
derived from Majewski et al (1996) "A Family of Perfect Hashing Methods"
<doi:10.1093/comjnl/39.6.547>.

Mike Cheng

colorfast

Fast Conversion of R Colors to Color Component Values and Native
Packed Integer Format

col_to_int function

<dl><dt>col</dt>
<dd>Character vector of color names. Supports all R color names
(e.g. "red", "hotpink") and hex colors of the form: "#RRGGBBAA", 
"#RRGGBB", "#RGBA" and "#RGB".</dd></dl>

Arguments

Fast conversion of colors-as-strings to an integer vector of packed RGBA values. — col_to_int

<dl>

<dt>col</dt>
<dd>Character vector of color names. Supports all R color names
(e.g. "red", "hotpink") and hex colors of the form: "#RRGGBBAA", 
"#RRGGBB", "#RGBA" and "#RGB".</dd>

</dl>

col_to_int: Fast conversion of colors-as-strings to an integer vector of packed RGBA values.

Description

Usage

Value

Arguments

Examples