PgSetChroma()

Set the chroma color and operation

Synopsis:

void PgSetChroma( PgColor_t ChromaColor,
                  unsigned long ChromaOp );

Library:

ph

Description:

This function sets the current chroma color and defines the chroma operation.

ChromaColor is the color to test against for chroma operations. ChromaOp is made up of the following bits:

Pg_CHROMA_SRC_MATCH

Test against the source data.

Pg_CHROMA_DEST_MATCH

Test against the destination data.

Pg_CHROMA_DRAW

If the test pixel matches the chroma color, draw it in the destination.

Pg_CHROMA_NODRAW

If the test pixel matches the chroma color, don't draw it in the destination.

Examples:

// Draw an image using a chroma color of full green

PhImage_t *image;
PhPoint_t p={0,0};

// Code to load the image...
   ...

PgChromaOn();
// Set the chroma operation to copy every pixel in the source to 
// the destination, except the color 0x0000FF00 (bright green)
PgSetChroma(0x0000FF00, Pg_CHROMA_SRC_MATCH | Pg_CHROMA_NODRAW);
PgDrawPhImagemx(&p,image,0);
PgChromaOff();
PgFlush();

Classification:

Photon

See also:

PgChromaOff(), PgChromaOn(), PgColor_t,

"Chroma key support" in the Raw Drawing and Animation chapter of the Photon Programmer's Guide