SkColorPriv.h File Reference

#include "include/core/SkColor.h"
#include "include/private/base/SkMath.h"
#include "include/private/base/SkTPin.h"
#include "include/private/base/SkTo.h"
#include <algorithm>

Include dependency graph for SkColorPriv.h:

Go to the source code of this file.

Macros
#define	SkAlphaMul(value, alpha256)   (((value) * (alpha256)) >> 8)
	Multiplify value by 0..256, and shift the result down 8 (i.e. More...
#define	SK_A32_BITS   8
#define	SK_R32_BITS   8
#define	SK_G32_BITS   8
#define	SK_B32_BITS   8
#define	SK_A32_MASK   ((1 << SK_A32_BITS) - 1)
#define	SK_R32_MASK   ((1 << SK_R32_BITS) - 1)
#define	SK_G32_MASK   ((1 << SK_G32_BITS) - 1)
#define	SK_B32_MASK   ((1 << SK_B32_BITS) - 1)
#define	SK_RGBA_R32_SHIFT   0
#define	SK_RGBA_G32_SHIFT   8
#define	SK_RGBA_B32_SHIFT   16
#define	SK_RGBA_A32_SHIFT   24
#define	SK_BGRA_B32_SHIFT   0
#define	SK_BGRA_G32_SHIFT   8
#define	SK_BGRA_R32_SHIFT   16
#define	SK_BGRA_A32_SHIFT   24
#define	SkGetPackedA32(packed)   ((uint32_t)((packed) << (24 - SK_A32_SHIFT)) >> 24)
#define	SkGetPackedR32(packed)   ((uint32_t)((packed) << (24 - SK_R32_SHIFT)) >> 24)
#define	SkGetPackedG32(packed)   ((uint32_t)((packed) << (24 - SK_G32_SHIFT)) >> 24)
#define	SkGetPackedB32(packed)   ((uint32_t)((packed) << (24 - SK_B32_SHIFT)) >> 24)
#define	SkA32Assert(a)   SkASSERT((unsigned)(a) <= SK_A32_MASK)
#define	SkR32Assert(r)   SkASSERT((unsigned)(r) <= SK_R32_MASK)
#define	SkG32Assert(g)   SkASSERT((unsigned)(g) <= SK_G32_MASK)
#define	SkB32Assert(b)   SkASSERT((unsigned)(b) <= SK_B32_MASK)

Functions
static unsigned	SkAlpha255To256 (U8CPU alpha)
	Turn 0..255 into 0..256 by adding 1 at the half-way point. More...
static U8CPU	SkUnitScalarClampToByte (SkScalar x)
static SkPMColor	SkPackARGB32 (U8CPU a, U8CPU r, U8CPU g, U8CPU b)
	Pack the components into a SkPMColor, checking (in the debug version) that the components are 0..255, and are already premultiplied (i.e. More...
static SkPMColor	SkPackARGB32NoCheck (U8CPU a, U8CPU r, U8CPU g, U8CPU b)
	Same as SkPackARGB32, but this version guarantees to not check that the values are premultiplied in the debug version. More...
static SkPMColor	SkPremultiplyARGBInline (U8CPU a, U8CPU r, U8CPU g, U8CPU b)
static SK_ALWAYS_INLINE uint32_t	SkAlphaMulQ (uint32_t c, unsigned scale)
static SkPMColor	SkPMSrcOver (SkPMColor src, SkPMColor dst)

Macro Definition Documentation

SK_A32_BITS

#define SK_A32_BITS   8

SK_A32_MASK

#define SK_A32_MASK   ((1 << SK_A32_BITS) - 1)

SK_B32_BITS

#define SK_B32_BITS   8

SK_B32_MASK

#define SK_B32_MASK   ((1 << SK_B32_BITS) - 1)

SK_BGRA_A32_SHIFT

#define SK_BGRA_A32_SHIFT   24

SK_BGRA_B32_SHIFT

#define SK_BGRA_B32_SHIFT   0

SK_BGRA_G32_SHIFT

#define SK_BGRA_G32_SHIFT   8

SK_BGRA_R32_SHIFT

#define SK_BGRA_R32_SHIFT   16

SK_G32_BITS

#define SK_G32_BITS   8

SK_G32_MASK

#define SK_G32_MASK   ((1 << SK_G32_BITS) - 1)

SK_R32_BITS

#define SK_R32_BITS   8

SK_R32_MASK

#define SK_R32_MASK   ((1 << SK_R32_BITS) - 1)

SK_RGBA_A32_SHIFT

#define SK_RGBA_A32_SHIFT   24

SK_RGBA_B32_SHIFT

#define SK_RGBA_B32_SHIFT   16

SK_RGBA_G32_SHIFT

#define SK_RGBA_G32_SHIFT   8

SK_RGBA_R32_SHIFT

#define SK_RGBA_R32_SHIFT   0

SkA32Assert

#define SkA32Assert

(

a

)

SkASSERT((unsigned)(a) <= SK_A32_MASK)

SkAlphaMul

#define SkAlphaMul	(		value,
			alpha256
	)		(((value) * (alpha256)) >> 8)

Multiplify value by 0..256, and shift the result down 8 (i.e.

return (value * alpha256) >> 8)

SkB32Assert

#define SkB32Assert

(

b

)

SkASSERT((unsigned)(b) <= SK_B32_MASK)

SkG32Assert

#define SkG32Assert

(

g

)

SkASSERT((unsigned)(g) <= SK_G32_MASK)

SkGetPackedA32

#define SkGetPackedA32

(

packed

)

((uint32_t)((packed) << (24 - SK_A32_SHIFT)) >> 24)

SkGetPackedB32

#define SkGetPackedB32

(

packed

)

((uint32_t)((packed) << (24 - SK_B32_SHIFT)) >> 24)

SkGetPackedG32

#define SkGetPackedG32

(

packed

)

((uint32_t)((packed) << (24 - SK_G32_SHIFT)) >> 24)

SkGetPackedR32

#define SkGetPackedR32

(

packed

)

((uint32_t)((packed) << (24 - SK_R32_SHIFT)) >> 24)

SkR32Assert

#define SkR32Assert

(

r

)

SkASSERT((unsigned)(r) <= SK_R32_MASK)

Function Documentation

SkAlpha255To256()

static unsigned SkAlpha255To256 ( U8CPU  alpha )

inlinestatic

Turn 0..255 into 0..256 by adding 1 at the half-way point.

Used to turn a byte into a scale value, so that we can say scale * value >> 8 instead of alpha * value / 255.

In debugging, asserts that alpha is 0..255

SkAlphaMulQ()

static SK_ALWAYS_INLINE uint32_t SkAlphaMulQ ( uint32_t  c, unsigned  scale  )

static

SkPackARGB32()

static SkPMColor SkPackARGB32 ( U8CPU  a, U8CPU  r, U8CPU  g, U8CPU  b  )

inlinestatic

Pack the components into a SkPMColor, checking (in the debug version) that the components are 0..255, and are already premultiplied (i.e.

alpha >= color)

SkPackARGB32NoCheck()

static SkPMColor SkPackARGB32NoCheck ( U8CPU  a, U8CPU  r, U8CPU  g, U8CPU  b  )

inlinestatic

Same as SkPackARGB32, but this version guarantees to not check that the values are premultiplied in the debug version.

SkPMSrcOver()

static SkPMColor SkPMSrcOver ( SkPMColor  src, SkPMColor  dst  )

inlinestatic

SkPremultiplyARGBInline()

static SkPMColor SkPremultiplyARGBInline ( U8CPU  a, U8CPU  r, U8CPU  g, U8CPU  b  )

inlinestatic

SkUnitScalarClampToByte()

static U8CPU SkUnitScalarClampToByte ( SkScalar  x )

inlinestatic