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Optimize QRgba64::toArgb32() and premultiplied() 

Using similar techniques as used for QRgb qPremultiply and friends

Change-Id: I4be68cb01dc3b634cf370323884e824674205998
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
bb10
Allan Sandfeld Jensen 2018-08-13 22:04:11 +02:00
parent 7264bf19db
commit bfe53c7da5
1 changed files with 34 additions and 6 deletions
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40
src/gui/painting/qrgba64.h
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@ -118,7 +118,27 @@ public:
Q_DECL_CONSTEXPR quint8 alpha8() const { return div_257(alpha()); }
Q_DECL_CONSTEXPR uint toArgb32() const
{
#if defined(__cpp_constexpr) && __cpp_constexpr-0 >= 201304
quint64 br = rgba & Q_UINT64_C(0xffff0000ffff);
quint64 ag = (rgba >> 16) & Q_UINT64_C(0xffff0000ffff);
br += Q_UINT64_C(0x8000000080);
ag += Q_UINT64_C(0x8000000080);
br = (br - ((br >> 8) & Q_UINT64_C(0xffff0000ffff))) >> 8;
ag = (ag - ((ag >> 8) & Q_UINT64_C(0xffff0000ffff)));
#if Q_BYTE_ORDER == Q_BIG_ENDIAN
return ((br << 24) & 0xff000000)
| ((ag >> 24) & 0xff0000)
| ((br >> 24) & 0xff00)
| ((ag >> 8) & 0xff);
#else
return ((ag >> 16) & 0xff000000)
| ((br << 16) & 0xff0000)
| (ag & 0xff00)
| ((br >> 32) & 0xff);
#endif
#else
return uint((alpha8() << 24) | (red8() << 16) | (green8() << 8) | blue8());
#endif
}
Q_DECL_CONSTEXPR ushort toRgb16() const
{
@ -131,11 +151,20 @@ public:
return *this;
if (isTransparent())
return QRgba64::fromRgba64(0);
const quint32 a = alpha();
const quint16 r = div_65535(red() * a);
const quint16 g = div_65535(green() * a);
const quint16 b = div_65535(blue() * a);
return fromRgba64(r, g, b, quint16(a));
const quint64 a = alpha();
quint64 br = (rgba & Q_UINT64_C(0xffff0000ffff)) * a;
quint64 ag = ((rgba >> 16) & Q_UINT64_C(0xffff0000ffff)) * a;
br = (br + ((br >> 16) & Q_UINT64_C(0xffff0000ffff)) + Q_UINT64_C(0x800000008000));
ag = (ag + ((ag >> 16) & Q_UINT64_C(0xffff0000ffff)) + Q_UINT64_C(0x800000008000));
#if Q_BYTE_ORDER == Q_BIG_ENDIAN
ag = ag & Q_UINT64_C(0xffff0000ffff0000);
br = (br >> 16) & Q_UINT64_C(0xffff00000000);
return fromRgba64(a | br | ag);
#else
br = (br >> 16) & Q_UINT64_C(0xffff0000ffff);
ag = ag & Q_UINT64_C(0xffff0000);
return fromRgba64((a << 48) | br | ag);
#endif
}
Q_DECL_RELAXED_CONSTEXPR QRgba64 unpremultiplied() const
@ -163,7 +192,6 @@ private:
static Q_DECL_CONSTEXPR Q_ALWAYS_INLINE quint8 div_257_floor(uint x) { return quint8((x - (x >> 8)) >> 8); }
static Q_DECL_CONSTEXPR Q_ALWAYS_INLINE quint8 div_257(quint16 x) { return div_257_floor(x + 128U); }
static Q_DECL_CONSTEXPR Q_ALWAYS_INLINE quint16 div_65535(uint x) { return quint16((x + (x>>16) + 0x8000U) >> 16); }
Q_DECL_RELAXED_CONSTEXPR Q_ALWAYS_INLINE QRgba64 unpremultiplied_32bit() const
{
if (isOpaque() || isTransparent())