Colors（颜色）¶

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The color module handles all color-related functions like changing color depth, creating colors from hex code, converting between color depths, mixing colors, etc.

lv_color_t is used to store a color, its fileds are set according to LV_COLOR_DEPTH in lv_conf.h. (See below)

You may set LV_COLOR_16_SWAP in lv_conf.h to swap the bytes of RGB565 colors. You may need this to send the 16-bit colors via a byte-oriented interface like SPI. As 16-bit numbers are stored in Little Endian format (lower byte on the lower address), the interface will send the lower byte first. However, displays usually need the higher byte first. A mismatch in the byte order will result in highly distorted colors.

颜色模块处理所有与颜色相关的功能，如更改颜色深度、从十六进制代码创建颜色、颜色深度之间的转换、混合颜色等。

lv_color_t 用于存储颜色，其字段根据 lv_conf.h 中的 LV_COLOR_DEPTH 设置。（见下文）

你可以在 lv_conf.h 中设置 LV_COLOR_16_SWAP 来交换 RGB565 颜色的字节。您可能需要它来通过面向字节的接口（如 SPI）发送 16 位颜色。由于 16 位数字以 Little Endian 格式存储（低位字节在低位地址），因此接口将首先发送低位字节。但是，显示器通常首先需要较高的字节。字节顺序不匹配将导致颜色高度失真。

Creating colors（创造色彩）¶

RGB（三原色）¶

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Create colors from Red, Green and Blue channel values

从红色、绿色和蓝色通道值创建颜色

//All channels are 0-255
lv_color_t c = lv_color_make(red, green, blue);

//From hex code 0x000000..0xFFFFFF interpreted as RED + GREEN + BLUE
lv_color_t c = lv_color_hex(0x123456); 

//From 3 digits. Same as lv_color_hex(0x112233)
lv_color_t c = lv_color_hex3(0x123); 

HSV（色调饱和值-Hue Saturation Value）¶

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Create colors from Hue, Saturation and Value values

根据色相、饱和度和值创建颜色

//h = 0..359, s = 0..100, v = 0..100
lv_color_t c = lv_color_hsv_to_rgb(h, s, v);

//All channels are 0-255
lv_color_hsv_t c_hsv = lv_color_rgb_to_hsv(r, g, b);


//From lv_color_t variable
lv_color_hsv_t c_hsv = lv_color_to_hsv(color);

Palette（调色板）¶

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LVGL includes material design's palette. In this all color have a main as well as four darker and five lighter variants.

The names of the colors are as follows:

LV_PALETTE_RED
LV_PALETTE_PINK
LV_PALETTE_PURPLE
LV_PALETTE_DEEP_PURPLE
LV_PALETTE_INDIGO
LV_PALETTE_BLUE
LV_PALETTE_LIGHT_BLUE
LV_PALETTE_CYAN
LV_PALETTE_TEAL
LV_PALETTE_GREEN
LV_PALETTE_LIGHT_GREEN
LV_PALETTE_LIME
LV_PALETTE_YELLOW
LV_PALETTE_AMBER
LV_PALETTE_ORANGE
LV_PALETTE_DEEP_ORANGE
LV_PALETTE_BROWN
LV_PALETTE_BLUE_GREY
LV_PALETTE_GREY

LVGL 包括材料设计的调色板。在此所有颜色都有一个主要的以及四个较深的变体和五个较浅的变体。

颜色名称如下：

LV_PALETTE_RED
LV_PALETTE_PINK
LV_PALETTE_PURPLE
LV_PALETTE_DEEP_PURPLE
LV_PALETTE_INDIGO
LV_PALETTE_BLUE
LV_PALETTE_LIGHT_BLUE
LV_PALETTE_CYAN
LV_PALETTE_TEAL
LV_PALETTE_GREEN
LV_PALETTE_LIGHT_GREEN
LV_PALETTE_LIME
LV_PALETTE_YELLOW
LV_PALETTE_AMBER
LV_PALETTE_ORANGE
LV_PALETTE_DEEP_ORANGE
LV_PALETTE_BROWN
LV_PALETTE_BLUE_GREY
LV_PALETTE_GREY

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To get the main color use lv_color_t c = lv_palette_main(LV_PALETTE_...).

For the lighter variants of a palette color use lv_color_t c = lv_palette_lighten(LV_PALETTE_..., v). v can be 1..5. For the darker variants of a palette color use lv_color_t c = lv_palette_darken(LV_PALETTE_..., v). v can be 1..4.

要获得主要颜色，请使用 lv_color_t c = lv_palette_main(LV_PALETTE_...)。

对于调色板颜色的较浅变体，请使用lv_color_t c = lv_palette_lighten(LV_PALETTE_..., v)。 v 可以是 1..5。

对于调色板颜色的较暗变体，请使用lv_color_t c = lv_palette_darken(LV_PALETTE_..., v)。 v 可以是 1..4。

Modify and mix colors（修改和混合颜色）¶

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The following functions can modify a color:

以下函数可以修改颜色：

// Lighten a color. 0: no change, 255: white
lv_color_t c = lv_color_lighten(c, lvl);

// Darken a color. 0: no change, 255: black
lv_color_t c = lv_color_darken(lv_color_t c, lv_opa_t lvl);

// Lighten or darken a color. 0: black, 128: no change 255: black
lv_color_t c = lv_color_change_lightness(lv_color_t c, lv_opa_t lvl);


// Mix 2 colors with a given ratio 0: full c2, 255: full c1, 128: half c1 and half c2
lv_color_t c = lv_color_mix(c1, c2, ratio);

Built-in colors（内置颜色）¶

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lv_color_white() and lv_color_black() return 0xFFFFFF and 0x000000 respectively.

lv_color_white() 和 lv_color_black() 分别返回 0xFFFFFF 和 0x000000。

Opacity（不透明度）¶

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To describe opacity the lv_opa_t type is created as a wrapper to uint8_t. Some defines are also introduced:

LV_OPA_TRANSP Value: 0, means the opacity makes the color completely transparent
LV_OPA_10 Value: 25, means the color covers only a little
LV_OPA_20 ... OPA_80 come logically
LV_OPA_90 Value: 229, means the color near completely covers
LV_OPA_COVER Value: 255, means the color completely covers

You can also use the LV_OPA_* defines in lv_color_mix() as a ratio.

Color types（颜色类型）¶

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The following variable types are defined by the color module:

lv_color1_t Monochrome color. Also has R, G, B fields for compatibility but they are always the same value (1 byte)
lv_color8_t A structure to store R (3 bit),G (3 bit),B (2 bit) components for 8-bit colors (1 byte)
lv_color16_t A structure to store R (5 bit),G (6 bit),B (5 bit) components for 16-bit colors (2 byte)
lv_color32_t A structure to store R (8 bit),G (8 bit), B (8 bit) components for 24-bit colors (4 byte)
lv_color_t Equal to lv_color1/8/16/24_t depending on current color depth setting
lv_color_int_t uint8_t, uint16_t or uint32_t depending on color depth setting. Used to build color arrays from plain numbers.
lv_opa_t A simple uint8_t type to describe opacity.

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The lv_color_t, lv_color1_t, lv_color8_t, lv_color16_t and lv_color32_t types have four fields:

ch.red red channel
ch.green green channel
ch.blue blue channel
full* red + green + blue as one number

You can set the current color depth in lv_conf.h, by setting the LV_COLOR_DEPTH define to 1 (monochrome), 8, 16 or 32.

Convert color（颜色转换）¶

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You can convert a color from the current color depth to another. The converter functions return with a number, so you have to use the full field:

lv_color_t c;
c.red   = 0x38;
c.green = 0x70;
c.blue  = 0xCC;

lv_color1_t c1;
c1.full = lv_color_to1(c);	/*Return 1 for light colors, 0 for dark colors*/

lv_color8_t c8;
c8.full = lv_color_to8(c);	/*Give a 8 bit number with the converted color*/

lv_color16_t c16;
c16.full = lv_color_to16(c); /*Give a 16 bit number with the converted color*/

lv_color32_t c24;
c32.full = lv_color_to32(c);	/*Give a 32 bit number with the converted color*/

API¶

Typedefs

typedef lv_color_t (*lv_color_filter_cb_t)(const struct _lv_color_filter_dsc_t*, lv_color_t, lv_opa_t)¶

typedef struct _lv_color_filter_dsc_t lv_color_filter_dsc_t¶

Enums

enum [anonymous]¶

Opacity percentages.

Values:

enumerator LV_OPA_TRANSP¶

enumerator LV_OPA_0¶

enumerator LV_OPA_10¶

enumerator LV_OPA_20¶

enumerator LV_OPA_30¶

enumerator LV_OPA_40¶

enumerator LV_OPA_50¶

enumerator LV_OPA_60¶

enumerator LV_OPA_70¶

enumerator LV_OPA_80¶

enumerator LV_OPA_90¶

enumerator LV_OPA_100¶

enumerator LV_OPA_COVER¶

enum lv_palette_t¶

Values:

enumerator LV_PALETTE_RED¶

enumerator LV_PALETTE_PINK¶

enumerator LV_PALETTE_PURPLE¶

enumerator LV_PALETTE_DEEP_PURPLE¶

enumerator LV_PALETTE_INDIGO¶

enumerator LV_PALETTE_BLUE¶

enumerator LV_PALETTE_LIGHT_BLUE¶

enumerator LV_PALETTE_CYAN¶

enumerator LV_PALETTE_TEAL¶

enumerator LV_PALETTE_GREEN¶

enumerator LV_PALETTE_LIGHT_GREEN¶

enumerator LV_PALETTE_LIME¶

enumerator LV_PALETTE_YELLOW¶

enumerator LV_PALETTE_AMBER¶

enumerator LV_PALETTE_ORANGE¶

enumerator LV_PALETTE_DEEP_ORANGE¶

enumerator LV_PALETTE_BROWN¶

enumerator LV_PALETTE_BLUE_GREY¶

enumerator LV_PALETTE_GREY¶

enumerator _LV_PALETTE_LAST¶

enumerator LV_PALETTE_NONE¶

Functions

LV_EXPORT_CONST_INT(LV_COLOR_DEPTH)¶

LV_EXPORT_CONST_INT(LV_COLOR_16_SWAP)¶

typedef LV_CONCAT3 (uint, LV_COLOR_SIZE, _t) lv_color_int_t

typedef LV_CONCAT3 (lv_color, LV_COLOR_DEPTH, _t) lv_color_t

static inline uint8_t lv_color_to1(lv_color_t color)¶

static inline uint8_t lv_color_to8(lv_color_t color)¶

static inline uint16_t lv_color_to16(lv_color_t color)¶

static inline uint32_t lv_color_to32(lv_color_t color)¶

static inline uint8_t lv_color_brightness(lv_color_t color)¶

Get the brightness of a color

参数: color -- a color
返回: the brightness [0..255]

static inline lv_color_t lv_color_make(uint8_t r, uint8_t g, uint8_t b)¶

static inline lv_color_t lv_color_hex(uint32_t c)¶

static inline lv_color_t lv_color_hex3(uint32_t c)¶

static inline void lv_color_filter_dsc_init(lv_color_filter_dsc_t *dsc, lv_color_filter_cb_t cb)¶

lv_color_t lv_color_lighten(lv_color_t c, lv_opa_t lvl)¶

lv_color_t lv_color_darken(lv_color_t c, lv_opa_t lvl)¶

lv_color_t lv_color_change_lightness(lv_color_t c, lv_opa_t lvl)¶

lv_color_t lv_color_hsv_to_rgb(uint16_t h, uint8_t s, uint8_t v)¶

Convert a HSV color to RGB

参数

h -- hue [0..359]
s -- saturation [0..100]
v -- value [0..100]

返回

the given RGB color in RGB (with LV_COLOR_DEPTH depth)

lv_color_hsv_t lv_color_rgb_to_hsv(uint8_t r8, uint8_t g8, uint8_t b8)¶

Convert a 32-bit RGB color to HSV

参数

r8 -- 8-bit red
g8 -- 8-bit green
b8 -- 8-bit blue

返回

the given RGB color in HSV

lv_color_hsv_t lv_color_to_hsv(lv_color_t color)¶

Convert a color to HSV

参数: color -- color
返回: the given color in HSV

static inline lv_color_t lv_color_chroma_key(void)¶

Just a wrapper around LV_COLOR_CHROMA_KEY because it might be more convenient to use a function is some cases

返回: LV_COLOR_CHROMA_KEY

lv_color_t lv_palette_main(lv_palette_t p)¶

static inline lv_color_t lv_color_white(void)¶

static inline lv_color_t lv_color_black(void)¶

lv_color_t lv_palette_lighten(lv_palette_t p, uint8_t lvl)¶

lv_color_t lv_palette_darken(lv_palette_t p, uint8_t lvl)¶

union lv_color1_t¶

Public Members

uint8_t full¶

uint8_t blue¶

uint8_t green¶

uint8_t red¶

union lv_color1_t::[anonymous] ch¶

union lv_color8_t¶

Public Members

uint8_t blue¶

uint8_t green¶

uint8_t red¶

struct lv_color8_t::[anonymous] ch¶

uint8_t full¶

union lv_color16_t¶

Public Members

uint16_t blue¶

uint16_t green¶

uint16_t red¶

uint16_t green_h¶

uint16_t green_l¶

struct lv_color16_t::[anonymous] ch¶

uint16_t full¶

union lv_color32_t¶

Public Members

uint8_t blue¶

uint8_t green¶

uint8_t red¶

uint8_t alpha¶

struct lv_color32_t::[anonymous] ch¶

uint32_t full¶

struct lv_color_hsv_t¶

Public Members

uint16_t h¶

uint8_t s¶

uint8_t v¶

struct _lv_color_filter_dsc_t¶

Public Members

lv_color_filter_cb_t filter_cb¶

void *user_data¶