SkColor SkPMColorToColor(SkPMColor pm)
{
if (0 == pm)
return 0;
unsigned a = SkGetPackedA32(pm);
uint32_t scale = (255 << 16) / a;
return SkColorSetARGB(a,
InvScaleByte(SkGetPackedR32(pm), scale),
InvScaleByte(SkGetPackedG32(pm), scale),
InvScaleByte(SkGetPackedB32(pm), scale));
}
SkColor SkPMColorToColor(SkPMColor pm)
{
if (!pm)
return 0;
unsigned a = SkGetPackedA32(pm);
if (!a) {
// A zero alpha value when there are non-zero R, G, or B channels is an
// invalid premultiplied color (since all channels should have been
// multiplied by 0 if a=0).
SkASSERT(false);
// In production, return 0 to protect against division by zero.
return 0;
}
uint32_t scale = (255 << 16) / a;
return SkColorSetARGB(a,
InvScaleByte(SkGetPackedR32(pm), scale),
InvScaleByte(SkGetPackedG32(pm), scale),
InvScaleByte(SkGetPackedB32(pm), scale));
}
