palette_func.h File Reference

#include "gfx_type.h"
#include "strings_type.h"
#include "string_type.h"

Go to the source code of this file.

Macros
#define	GREY_SCALE(level)   (level)
	Return the colour for a particular greyscale level. More...

Functions
bool	CopyPalette (Palette &local_palette, bool force_copy=false)
	Copy the current palette if the palette was updated. More...
void	GfxInitPalettes ()
uint8_t	GetNearestColourIndex (uint8_t r, uint8_t g, uint8_t b)
	Get nearest colour palette index from an RGB colour. More...
uint8_t	GetNearestColourIndex (const Colour colour)
bool	IsValidColours (Colours colours)
	Checks if a Colours value is valid. More...
TextColour	GetContrastColour (uint8_t background, uint8_t threshold=128)
	Determine a contrasty text colour for a coloured background. More...

Variables
Palette	_cur_palette
	Current palette.
byte	_colour_gradient [COLOUR_END][8]
	All 16 colour gradients 8 colours per gradient from darkest (0) to lightest (7)
static const uint8_t	PC_BLACK = GREY_SCALE(1)
	Black palette colour.
static const uint8_t	PC_DARK_GREY = GREY_SCALE(6)
	Dark grey palette colour.
static const uint8_t	PC_GREY = GREY_SCALE(10)
	Grey palette colour.
static const uint8_t	PC_WHITE = GREY_SCALE(15)
	White palette colour.
static const uint8_t	PC_VERY_DARK_RED = 0xB2
	Almost-black red palette colour.
static const uint8_t	PC_DARK_RED = 0xB4
	Dark red palette colour.
static const uint8_t	PC_RED = 0xB8
	Red palette colour.
static const uint8_t	PC_VERY_DARK_BROWN = 0x56
	Almost-black brown palette colour.
static const uint8_t	PC_ORANGE = 0xC2
	Orange palette colour.
static const uint8_t	PC_YELLOW = 0xBF
	Yellow palette colour.
static const uint8_t	PC_LIGHT_YELLOW = 0x44
	Light yellow palette colour.
static const uint8_t	PC_VERY_LIGHT_YELLOW = 0x45
	Almost-white yellow palette colour.
static const uint8_t	PC_GREEN = 0xD0
	Green palette colour.
static const uint8_t	PC_VERY_DARK_BLUE = 0x9A
	Almost-black blue palette colour.
static const uint8_t	PC_DARK_BLUE = 0x9D
	Dark blue palette colour.
static const uint8_t	PC_LIGHT_BLUE = 0x98
	Light blue palette colour.
static const uint8_t	PC_ROUGH_LAND = 0x52
	Dark green palette colour for rough land.
static const uint8_t	PC_GRASS_LAND = 0x54
	Dark green palette colour for grass land.
static const uint8_t	PC_BARE_LAND = 0x37
	Brown palette colour for bare land.
static const uint8_t	PC_RAINFOREST = 0x5C
	Pale green palette colour for rainforest.
static const uint8_t	PC_FIELDS = 0x25
	Light brown palette colour for fields.
static const uint8_t	PC_TREES = 0x57
	Green palette colour for trees.
static const uint8_t	PC_WATER = 0xC9
	Dark blue palette colour for water.

Detailed Description

Functions related to palettes.

Definition in file palette_func.h.

Macro Definition Documentation

GREY_SCALE

#define GREY_SCALE

(

level

)

(level)

Return the colour for a particular greyscale level.

Parameters

level

Intensity, 0 = black, 15 = white

Returns

colour

Definition at line 53 of file palette_func.h.

Function Documentation

CopyPalette()

bool CopyPalette	(	Palette &	local_palette,
		bool	force_copy
	)

Copy the current palette if the palette was updated.

Used by video-driver to get a current up-to-date version of the palette, to avoid two threads accessing the same piece of memory (with a good chance one is already updating the palette while the other is drawing based on it).

Parameters

local_palette	The location to copy the palette to.
force_copy	Whether to ignore if there is an update for the palette.

Returns

True iff a copy was done.

Definition at line 154 of file palette.cpp.

References _cur_palette, _palette_mutex, Palette::count_dirty, Palette::first_dirty, and lock.

Referenced by VideoDriver_SDL::CheckPaletteAnim(), VideoDriver_Win32Base::CheckPaletteAnim(), VideoDriver_SDL_Base::CheckPaletteAnim(), and VideoDriver_SDL_Base::ClientSizeChanged().

GetContrastColour()

TextColour GetContrastColour	(	uint8_t	background,
		uint8_t	threshold
	)

Determine a contrasty text colour for a coloured background.

Parameters

background	Background colour.
threshold	Background colour brightness threshold below which the background is considered dark and TC_WHITE is returned, range: 0 - 255, default 128.

Returns

TC_BLACK or TC_WHITE depending on what gives a better contrast.

Definition at line 289 of file palette.cpp.

References _cur_palette, and Palette::palette.

GetNearestColourIndex()

uint8_t GetNearestColourIndex	(	uint8_t	r,
		uint8_t	g,
		uint8_t	b
	)

Get nearest colour palette index from an RGB colour.

A search is performed if this colour is not already in the lookup table.

Parameters

r	Red component.
g	Green component.
b	Blue component.

Returns

nearest colour palette index.

Definition at line 129 of file palette.cpp.

IsValidColours()

bool IsValidColours ( Colours  colours )

inline

Checks if a Colours value is valid.

Parameters

colours

The value to check

Returns

true if the given value is a valid Colours.

Definition at line 35 of file palette_func.h.

Referenced by StoryPageButtonData::GetColour().