Functions related to palettes. More...

#include "core/enum_type.hpp"
#include "gfx_type.h"
#include "strings_type.h"
#include "string_type.h"

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

Enumerations
enum	ColourShade : uint8_t { SHADE_BEGIN = 0 , SHADE_DARKEST = SHADE_BEGIN , SHADE_DARKER , SHADE_DARK , SHADE_NORMAL , SHADE_LIGHT , SHADE_LIGHTER , SHADE_LIGHTEST , SHADE_LIGHTEREST , SHADE_END }

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...

uint8_t	GetColourGradient (Colours colour, ColourShade shade)
	Get colour gradient palette index. More...

void	SetColourGradient (Colours colour, ColourShade shade, uint8_t palette_colour)
	Set colour gradient palette index. More...

Variables
Palette	_cur_palette
	Current palette.

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 65 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 152 of file palette.cpp.

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

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

◆ GetColourGradient()

uint8_t GetColourGradient	(	Colours	colour,
		ColourShade	shade
	)

Get colour gradient palette index.

Parameters

colour	Colour.
shade	Shade level from 1 to 7.

Returns: palette index of colour.

Definition at line 314 of file palette.cpp.

Referenced by NWidgetMatrix::Draw(), DrawCaption(), DrawFrame(), LinkGraphOverlay::DrawStationDots(), and GetDrawStringCompanyColour().

◆ 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 287 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 127 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 36 of file palette_func.h.

Referenced by StoryPageButtonData::GetColour().

◆ SetColourGradient()

void SetColourGradient	(	Colours	colour,
		ColourShade	shade,
		uint8_t	palette_index
	)

Set colour gradient palette index.

Parameters

colour	Colour.
shade	Shade level from 1 to 7.
palette_index	Palette index to set.

Definition at line 325 of file palette.cpp.

Macros

Enumerations

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ GREY_SCALE

Function Documentation

◆ CopyPalette()

◆ GetColourGradient()

◆ GetContrastColour()

◆ GetNearestColourIndex()

◆ IsValidColours()

◆ SetColourGradient()