#include <cartotype_color.h>
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static int32_t | Grey (int32_t aRed, int32_t aGreen, int32_t aBlue) |
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A color.
Colors are represented by 32-bit integers containing 8 bits each of red, green, blue and alpha channel (transparency) data.
◆ Color() [1/5]
CartoTypeCore::Color::Color |
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inline |
Creates a color and set it to opaque black.
◆ Color() [2/5]
CartoTypeCore::Color::Color |
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uint32_t |
aValue | ) |
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inline |
Creates a color from an integer value.
◆ Color() [3/5]
CartoTypeCore::Color::Color |
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int32_t |
aRed, |
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int32_t |
aGreen, |
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int32_t |
aBlue, |
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int32_t |
aAlpha = 0xFF |
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) |
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inline |
Creates a color from red, green, blue and alpha values.
◆ Color() [4/5]
CartoTypeCore::Color::Color |
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const MString & |
aColor | ) |
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explicit |
Creates a color from a color expression as used in style sheets.
◆ Color() [5/5]
CartoTypeCore::Color::Color |
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const String & |
aColor | ) |
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explicit |
Creates a color from a color expression as used in style sheets.
◆ Alpha()
int32_t CartoTypeCore::Color::Alpha |
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const |
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inline |
Returns the alpha (transparency) level as a value in the range 0...255: 0 = transparent, 255 = opaque.
◆ Blend() [1/2]
void CartoTypeCore::Color::Blend |
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Color |
aOtherColor | ) |
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Blends aOtherColor with this color in the proportion specified by the other color's alpha value, preserving this color's alpha value.
◆ Blend() [2/2]
void CartoTypeCore::Color::Blend |
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Color |
aOtherColor, |
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int32_t |
aOtherColorAlpha |
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Blends aOtherColor with this color in the proportion specified by aOtherColorAlpha, which must be in the range 0...255.
◆ Blue()
int32_t CartoTypeCore::Color::Blue |
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const |
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inline |
Returns the blue component as a value in the range 0...255.
◆ CombineAlpha()
void CartoTypeCore::Color::CombineAlpha |
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int32_t |
aAlpha | ) |
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Multiplies the current alpha value by a new alpha value in the range 0...255.
◆ Gray()
int32_t CartoTypeCore::Color::Gray |
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const |
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◆ Green()
int32_t CartoTypeCore::Color::Green |
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const |
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inline |
Returns the green component as a value in the range 0...255.
◆ Grey() [1/2]
int32_t CartoTypeCore::Color::Grey |
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const |
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inline |
Returns the grey level as a value in the range 0...255. Uses the formula Grey = (Red * 0.299 + Green * 0.587 + Blue * 0.114), derived from the BT.601 standard.
◆ Grey() [2/2]
static int32_t CartoTypeCore::Color::Grey |
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int32_t |
aRed, |
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int32_t |
aGreen, |
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int32_t |
aBlue |
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inlinestatic |
Returns a grey level as a value in the range 0...255, calculated from red, green and blue levels in that range. Uses the formula Grey = (Red * 0.299 + Green * 0.587 + Blue * 0.114), derived from the BT.601 standard.
◆ IsNull()
bool CartoTypeCore::Color::IsNull |
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const |
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Returns true if the colour is null.
◆ operator!=()
bool CartoTypeCore::Color::operator!= |
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const Color & |
aColor | ) |
const |
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inline |
◆ operator==()
bool CartoTypeCore::Color::operator== |
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const Color & |
aColor | ) |
const |
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◆ PremultiplyAlpha()
void CartoTypeCore::Color::PremultiplyAlpha |
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Converts a color to premultiplied-alpha format. This function assumes that the color is in non-premultiplied-alpha format, where the three color components can have any value, and multiplies the color components by the alpha value, yielding values in the range 0...alpha.
Premultiplied alpha format is the format used by CartoTypeCore in 32bpp RGBA bitmaps, and as the return value of MPaintServer::Color.
◆ Red()
int32_t CartoTypeCore::Color::Red |
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const |
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Returns the red component as a value in the range 0...255.
◆ Set()
size_t CartoTypeCore::Color::Set |
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const MString & |
aColor | ) |
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Sets a color from a string. Returns the number of characters successfully parsed.
◆ SetAlpha()
void CartoTypeCore::Color::SetAlpha |
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int32_t |
aAlpha | ) |
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inline |
Sets the alpha (transparency) level to a value in the range 0...255: 0 = transparent, 255 = opaque.
◆ Value
uint32_t CartoTypeCore::Color::Value { KBlack } |
The color value, containing, starting with the least significant byte, red, green, blue and alpha levels, each stored in eight bits. The color levels represent intensity. The alpha level represents opacity.
The documentation for this class was generated from the following files:
- cartotype_color.h
- cartotype_graphics.cpp