#include <gdi.h>
| class TColor256Util |
| Public Attributes | |
|---|---|
| TUint32 | iColorTable |
| TUint8 | iInverseColorTable |
| 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() |
Enables conversion, in both directions, between a TRgb object and an index into an arbitrary 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.
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.
| Parameter | Description |
|---|---|
| aRgb | The conversion colour. |
Returns: The index of the nearest colour to aRgb in the palette.
Gets the entries from the inverse colour lookup table for the colours that most closely match the specified TRgb values.
| Parameter | Description |
|---|---|
| aDestination | On return, a pointer to a buffer containing the entries from the inverse colour lookup table. |
| aSource | Pointer to the first TRgb value to match. |
| aNumPixels | The number of TRgb values to match. |
| IMPORT_C void | Construct | ( | const CPalette & | aPalette | ) |
Initialises the two lookup tables using the specified palette.
| Parameter | Description |
|---|---|
| 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.
Returns: Pointer to the system default 256 colour palette.