[Library] PAWN Colour Manipulation

[kristo]

PAWN Colour Manipulation







This library provides a number of easy-to-use colour manipulation functions for PAWN.



Installation



Simply install to your project:

Code:

sampctl package install kristoisberg/pawn-colour-manipulation

Include in your code and begin using the library:

PHP Code:

#include <colour-manipulation> 


Testing



To test, simply run the package:

Code:

sampctl package run

There is also a separate test script (samp-grayscale-bitmap) that unfortunately doesn?t work yet due to a bug in samp-bitmapper.



Functions

PHP Code:

GetColourComponents(colour, &Float:r, &Float:g, &Float:b, &Float:a = 1.0, ColourMode:mode = COLOUR_MODE_RGBA) 


Extracts the RGB(A) components from a colour code.

PHP Code:

Float:GetColourComponent(colour, ColourComponent:component, ColourMode:mode = COLOUR_MODE_RGBA) 


Extracts an individual colour component from a colour code and returns it.

PHP Code:

SetColourComponent(colour, ColourComponent:component, Float:value, ColourMode:mode = COLOUR_MODE_RGBA) 


Modifies an individual component of an existing colour and returns the new colour.

PHP Code:

GetColourCode(Float:r, Float:g, Float:b, Float:a = 1.0, ColourMode:mode = COLOUR_MODE_RGBA) 


Creates a colour code from RGB(A) components.

PHP Code:

ConvertColour(colour, ColourMode:from, ColourMode:to, Float:alpha = 1.0) 


Converts a colour from one colour mode to another. Alpha should be specified when converting from RGB, otherwise 0xFF (fully non-transparent) is used.

PHP Code:

InterpolateColours(colour1, colour2, Float:amount, ColourMode:mode = COLOUR_MODE_RGBA) 


Interpolates two colours. amount must be in the range 0.0 - 1.0. The larger amount is, the closer the returned colour is to colour2.

PHP Code:

Float:GetColourBrightness(colour, ColourMode:mode = COLOUR_MODE_RGBA) 


Returns the brightness of a colour.

PHP Code:

DarkenColour(colour, Float:amount, ColourMode:mode = COLOUR_MODE_RGBA) 


Darkens a colour by interpolating it with the black colour.

PHP Code:

LightenColour(colour, Float:amount, ColourMode:mode = COLOUR_MODE_RGBA) 


Lightens a colour by interpolating it with the white colour.

PHP Code:

GrayscaleColour(colour, ColourMode:mode = COLOUR_MODE_RGBA) 


Returns the grayscale equivalent of a colour.

PHP Code:

Float:GetColourComponentFractValue(value) 


Converts a binary colour component value to a fractional value.

PHP Code:

GetColourComponentBinaryValue(Float:value) 


Converts a fractional colour component value to a binary value.

PHP Code:

Float:AddColourComponentGammaCor(Float:value) 


Adds sRGB gamma correction to a colour component.

PHP Code:

Float:RemoveColourComponentGammaCor(Float:value) 


Removes the sRGB gamma correction from a colour component.



Definitions



Colour modes



COLOUR_MODE_RGBA - The most common colour format in SA-MP: used by SendClientMessage, textdraws, etc.



COLOUR_MODE_ARGB- Colour format used by SetObjectMaterial, SetObjectMaterialText and SetPlayerAttachedObject.



COLOUR_MODE_RGB - Colour format used by embedded colours, probably the most common colour format outside of SA-MP, most notably in webpages.



Colour components



COLOUR_COMPONENT_R - Red



COLOUR_COMPONENT_G - Green



COLOUR_COMPONENT_B - Blue



COLOUR_COMPONENT_A - Alpha



Notes



Both British and American spellings (color/colour, gray/grey) are supported for everything noted above.

[Y_Less]

Do you remember the link to the original article on the improved interpolation algorithm?

[kristo]

Do you remember the link to the original article on the improved interpolation algorithm?

I presume you mean this one?
http://entropymine.com/imageworsener/srgbformula/

Also, if anyone's interested, here are the other resources I used for reference when?creating this library:
http://blog.johnnovak.net/2016/09/21/wha...out-gamma/
https://stackoverflow.com/questions/5962...0#13558570

And the person who wrote the first article has a few more interesting ones here:
http://entropymine.com/imageworsener/

[Y_Less]

Actually I meant this one:



http://blog.johnnovak.net/2016/09/21/wha...out-gamma/



But you linked it anyway, so thanks.