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#ifndef SkXfermode_DEFINED
#define SkXfermode_DEFINED
#include "SkFlattenable.h"
#include "SkColor.h"
/** \class SkXfermode
SkXfermode is the base class for objects that are called to implement custom
"transfer-modes" in the drawing pipeline. The static function Create(Modes)
can be called to return an instance of any of the predefined subclasses as
specified in the Modes enum. When an SkXfermode is assigned to an SkPaint, then
objects drawn with that paint have the xfermode applied.
*/
class SkXfermode : public SkFlattenable {
public:
SkXfermode() {}
virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count, const SkAlpha aa[]);
virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count, const SkAlpha aa[]);
virtual void xferA8(SkAlpha dst[], const SkPMColor src[], int count, const SkAlpha aa[]);
protected:
SkXfermode(SkRBuffer&) {}
private:
typedef SkFlattenable INHERITED;
};
////////////////////////////////////////////////////////////////////////////////
/** \class SkProcXfermode
SkProcXfermode is a xfermode that applies the specified proc to its colors.
This class is not exported to java.
*/
class SkProcXfermode : public SkXfermode {
public:
SkProcXfermode(SkXfermodeProc proc) : fProc(proc) {}
// overrides from SkXfermode
virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count, const SkAlpha aa[]);
virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count, const SkAlpha aa[]);
virtual void xferA8(SkAlpha dst[], const SkPMColor src[], int count, const SkAlpha aa[]);
// overrides from SkFlattenable
virtual Factory getFactory();
virtual void flatten(SkWBuffer&);
protected:
SkProcXfermode(SkRBuffer&);
private:
SkXfermodeProc fProc;
static SkFlattenable* CreateProc(SkRBuffer&);
typedef SkXfermode INHERITED;
};
#endif
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