| class TColor256Util |
Enables conversion, in both directions, between a TRgb object and an index into an arbitrary 256 colour palette.
| Public Member Functions | |
|---|---|
| IMPORT_C TInt | Color256(TRgb) |
| IMPORT_C void | Color256(TUint8 *, const TRgb *, TInt) |
| TRgb | Color256(TInt) |
| IMPORT_C void | Construct(const CPalette &) |
| IMPORT_C const TColor256Util * | Default() |
| Public Attributes | |
|---|---|
| TUint32 | iColorTable |
| TUint8 | iInverseColorTable |
| IMPORT_C TInt | Color256 | ( | TRgb | aRgb | ) | const |
Gets the entry from the inverse colour lookup table for the colour that most closely matches the specified TRgb value.
Entries in the inverse colour lookup table are indices into the palette that the object was created with. Essentially, this function matches aRgb to the index of the nearest colour in the palette.
| TRgb aRgb | The conversion colour. |
| IMPORT_C void | Color256 | ( | TUint8 * | aDestination, |
| const TRgb * | aSource, | |||
| TInt | aNumPixels | |||
| ) | const | |||
Gets the entries from the inverse colour lookup table for the colours that most closely match the specified TRgb values.
| TRgb | Color256 | ( | TInt | aColor256 | ) | const [inline] |
Gets the TRgb value of the entry at the specified index in the colour lookup table.
| TInt aColor256 | The index into the colour lookup table. |
| IMPORT_C void | Construct | ( | const CPalette & | aPalette | ) |
Initialises the two lookup tables using the specified palette.
| const CPalette & aPalette | The palette of colours used to initialise the colour lookup tables. |
| IMPORT_C const TColor256Util * | Default | ( | ) | [static] |
Returns a pointer to the system default 256 colour palette.
| TUint32 | iColorTable |
256 colour lookup table.
Each entry is a 32 bit value which corresponds to a TRgb value in the palette passed to Construct(). If there are more than 256 colours in the palette, the first 256 colours are used in this table. If there are fewer than 256 entries, the remaining entries in the table are set to zero.
| TUint8 | iInverseColorTable |
Inverse colour lookup table.
It has 4096 entries. Each entry is the index of a colour in the palette that the object was created with (see Construct()) that most closely matches the 4096 degrees of intensity of red, green and blue on a uniform 16x16x16 colour cube.
It is called "inverse" because iColorTable maps indices (0..255) to TRgb values, but this table maps TRgb values to palette indices.
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