123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444 |
- /*
- * Copyright 2006 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef SkColorData_DEFINED
- #define SkColorData_DEFINED
- #include "include/core/SkColor.h"
- #include "include/core/SkColorPriv.h"
- #include "include/private/SkNx.h"
- #include "include/private/SkTo.h"
- ////////////////////////////////////////////////////////////////////////////////////////////
- // Convert a 16bit pixel to a 32bit pixel
- #define SK_R16_BITS 5
- #define SK_G16_BITS 6
- #define SK_B16_BITS 5
- #define SK_R16_SHIFT (SK_B16_BITS + SK_G16_BITS)
- #define SK_G16_SHIFT (SK_B16_BITS)
- #define SK_B16_SHIFT 0
- #define SK_R16_MASK ((1 << SK_R16_BITS) - 1)
- #define SK_G16_MASK ((1 << SK_G16_BITS) - 1)
- #define SK_B16_MASK ((1 << SK_B16_BITS) - 1)
- #define SkGetPackedR16(color) (((unsigned)(color) >> SK_R16_SHIFT) & SK_R16_MASK)
- #define SkGetPackedG16(color) (((unsigned)(color) >> SK_G16_SHIFT) & SK_G16_MASK)
- #define SkGetPackedB16(color) (((unsigned)(color) >> SK_B16_SHIFT) & SK_B16_MASK)
- static inline unsigned SkR16ToR32(unsigned r) {
- return (r << (8 - SK_R16_BITS)) | (r >> (2 * SK_R16_BITS - 8));
- }
- static inline unsigned SkG16ToG32(unsigned g) {
- return (g << (8 - SK_G16_BITS)) | (g >> (2 * SK_G16_BITS - 8));
- }
- static inline unsigned SkB16ToB32(unsigned b) {
- return (b << (8 - SK_B16_BITS)) | (b >> (2 * SK_B16_BITS - 8));
- }
- #define SkPacked16ToR32(c) SkR16ToR32(SkGetPackedR16(c))
- #define SkPacked16ToG32(c) SkG16ToG32(SkGetPackedG16(c))
- #define SkPacked16ToB32(c) SkB16ToB32(SkGetPackedB16(c))
- //////////////////////////////////////////////////////////////////////////////
- #define SkASSERT_IS_BYTE(x) SkASSERT(0 == ((x) & ~0xFF))
- // Reverse the bytes coorsponding to RED and BLUE in a packed pixels. Note the
- // pair of them are in the same 2 slots in both RGBA and BGRA, thus there is
- // no need to pass in the colortype to this function.
- static inline uint32_t SkSwizzle_RB(uint32_t c) {
- static const uint32_t kRBMask = (0xFF << SK_R32_SHIFT) | (0xFF << SK_B32_SHIFT);
- unsigned c0 = (c >> SK_R32_SHIFT) & 0xFF;
- unsigned c1 = (c >> SK_B32_SHIFT) & 0xFF;
- return (c & ~kRBMask) | (c0 << SK_B32_SHIFT) | (c1 << SK_R32_SHIFT);
- }
- static inline uint32_t SkPackARGB_as_RGBA(U8CPU a, U8CPU r, U8CPU g, U8CPU b) {
- SkASSERT_IS_BYTE(a);
- SkASSERT_IS_BYTE(r);
- SkASSERT_IS_BYTE(g);
- SkASSERT_IS_BYTE(b);
- return (a << SK_RGBA_A32_SHIFT) | (r << SK_RGBA_R32_SHIFT) |
- (g << SK_RGBA_G32_SHIFT) | (b << SK_RGBA_B32_SHIFT);
- }
- static inline uint32_t SkPackARGB_as_BGRA(U8CPU a, U8CPU r, U8CPU g, U8CPU b) {
- SkASSERT_IS_BYTE(a);
- SkASSERT_IS_BYTE(r);
- SkASSERT_IS_BYTE(g);
- SkASSERT_IS_BYTE(b);
- return (a << SK_BGRA_A32_SHIFT) | (r << SK_BGRA_R32_SHIFT) |
- (g << SK_BGRA_G32_SHIFT) | (b << SK_BGRA_B32_SHIFT);
- }
- static inline SkPMColor SkSwizzle_RGBA_to_PMColor(uint32_t c) {
- #ifdef SK_PMCOLOR_IS_RGBA
- return c;
- #else
- return SkSwizzle_RB(c);
- #endif
- }
- static inline SkPMColor SkSwizzle_BGRA_to_PMColor(uint32_t c) {
- #ifdef SK_PMCOLOR_IS_BGRA
- return c;
- #else
- return SkSwizzle_RB(c);
- #endif
- }
- //////////////////////////////////////////////////////////////////////////////
- ///@{
- /** See ITU-R Recommendation BT.709 at http://www.itu.int/rec/R-REC-BT.709/ .*/
- #define SK_ITU_BT709_LUM_COEFF_R (0.2126f)
- #define SK_ITU_BT709_LUM_COEFF_G (0.7152f)
- #define SK_ITU_BT709_LUM_COEFF_B (0.0722f)
- ///@}
- ///@{
- /** A float value which specifies this channel's contribution to luminance. */
- #define SK_LUM_COEFF_R SK_ITU_BT709_LUM_COEFF_R
- #define SK_LUM_COEFF_G SK_ITU_BT709_LUM_COEFF_G
- #define SK_LUM_COEFF_B SK_ITU_BT709_LUM_COEFF_B
- ///@}
- /** Computes the luminance from the given r, g, and b in accordance with
- SK_LUM_COEFF_X. For correct results, r, g, and b should be in linear space.
- */
- static inline U8CPU SkComputeLuminance(U8CPU r, U8CPU g, U8CPU b) {
- //The following is
- //r * SK_LUM_COEFF_R + g * SK_LUM_COEFF_G + b * SK_LUM_COEFF_B
- //with SK_LUM_COEFF_X in 1.8 fixed point (rounding adjusted to sum to 256).
- return (r * 54 + g * 183 + b * 19) >> 8;
- }
- /** Calculates 256 - (value * alpha256) / 255 in range [0,256],
- * for [0,255] value and [0,256] alpha256.
- */
- static inline U16CPU SkAlphaMulInv256(U16CPU value, U16CPU alpha256) {
- unsigned prod = 0xFFFF - value * alpha256;
- return (prod + (prod >> 8)) >> 8;
- }
- // The caller may want negative values, so keep all params signed (int)
- // so we don't accidentally slip into unsigned math and lose the sign
- // extension when we shift (in SkAlphaMul)
- static inline int SkAlphaBlend(int src, int dst, int scale256) {
- SkASSERT((unsigned)scale256 <= 256);
- return dst + SkAlphaMul(src - dst, scale256);
- }
- static inline uint16_t SkPackRGB16(unsigned r, unsigned g, unsigned b) {
- SkASSERT(r <= SK_R16_MASK);
- SkASSERT(g <= SK_G16_MASK);
- SkASSERT(b <= SK_B16_MASK);
- return SkToU16((r << SK_R16_SHIFT) | (g << SK_G16_SHIFT) | (b << SK_B16_SHIFT));
- }
- #define SK_R16_MASK_IN_PLACE (SK_R16_MASK << SK_R16_SHIFT)
- #define SK_G16_MASK_IN_PLACE (SK_G16_MASK << SK_G16_SHIFT)
- #define SK_B16_MASK_IN_PLACE (SK_B16_MASK << SK_B16_SHIFT)
- ///////////////////////////////////////////////////////////////////////////////
- /**
- * Abstract 4-byte interpolation, implemented on top of SkPMColor
- * utility functions. Third parameter controls blending of the first two:
- * (src, dst, 0) returns dst
- * (src, dst, 0xFF) returns src
- * srcWeight is [0..256], unlike SkFourByteInterp which takes [0..255]
- */
- static inline SkPMColor SkFourByteInterp256(SkPMColor src, SkPMColor dst,
- unsigned scale) {
- unsigned a = SkAlphaBlend(SkGetPackedA32(src), SkGetPackedA32(dst), scale);
- unsigned r = SkAlphaBlend(SkGetPackedR32(src), SkGetPackedR32(dst), scale);
- unsigned g = SkAlphaBlend(SkGetPackedG32(src), SkGetPackedG32(dst), scale);
- unsigned b = SkAlphaBlend(SkGetPackedB32(src), SkGetPackedB32(dst), scale);
- return SkPackARGB32(a, r, g, b);
- }
- /**
- * Abstract 4-byte interpolation, implemented on top of SkPMColor
- * utility functions. Third parameter controls blending of the first two:
- * (src, dst, 0) returns dst
- * (src, dst, 0xFF) returns src
- */
- static inline SkPMColor SkFourByteInterp(SkPMColor src, SkPMColor dst,
- U8CPU srcWeight) {
- unsigned scale = SkAlpha255To256(srcWeight);
- return SkFourByteInterp256(src, dst, scale);
- }
- /**
- * 0xAARRGGBB -> 0x00AA00GG, 0x00RR00BB
- */
- static inline void SkSplay(uint32_t color, uint32_t* ag, uint32_t* rb) {
- const uint32_t mask = 0x00FF00FF;
- *ag = (color >> 8) & mask;
- *rb = color & mask;
- }
- /**
- * 0xAARRGGBB -> 0x00AA00GG00RR00BB
- * (note, ARGB -> AGRB)
- */
- static inline uint64_t SkSplay(uint32_t color) {
- const uint32_t mask = 0x00FF00FF;
- uint64_t agrb = (color >> 8) & mask; // 0x0000000000AA00GG
- agrb <<= 32; // 0x00AA00GG00000000
- agrb |= color & mask; // 0x00AA00GG00RR00BB
- return agrb;
- }
- /**
- * 0xAAxxGGxx, 0xRRxxBBxx-> 0xAARRGGBB
- */
- static inline uint32_t SkUnsplay(uint32_t ag, uint32_t rb) {
- const uint32_t mask = 0xFF00FF00;
- return (ag & mask) | ((rb & mask) >> 8);
- }
- /**
- * 0xAAxxGGxxRRxxBBxx -> 0xAARRGGBB
- * (note, AGRB -> ARGB)
- */
- static inline uint32_t SkUnsplay(uint64_t agrb) {
- const uint32_t mask = 0xFF00FF00;
- return SkPMColor(
- ((agrb & mask) >> 8) | // 0x00RR00BB
- ((agrb >> 32) & mask)); // 0xAARRGGBB
- }
- static inline SkPMColor SkFastFourByteInterp256_32(SkPMColor src, SkPMColor dst, unsigned scale) {
- SkASSERT(scale <= 256);
- // Two 8-bit blends per two 32-bit registers, with space to make sure the math doesn't collide.
- uint32_t src_ag, src_rb, dst_ag, dst_rb;
- SkSplay(src, &src_ag, &src_rb);
- SkSplay(dst, &dst_ag, &dst_rb);
- const uint32_t ret_ag = src_ag * scale + (256 - scale) * dst_ag;
- const uint32_t ret_rb = src_rb * scale + (256 - scale) * dst_rb;
- return SkUnsplay(ret_ag, ret_rb);
- }
- static inline SkPMColor SkFastFourByteInterp256_64(SkPMColor src, SkPMColor dst, unsigned scale) {
- SkASSERT(scale <= 256);
- // Four 8-bit blends in one 64-bit register, with space to make sure the math doesn't collide.
- return SkUnsplay(SkSplay(src) * scale + (256-scale) * SkSplay(dst));
- }
- // TODO(mtklein): Replace slow versions with fast versions, using scale + (scale>>7) everywhere.
- /**
- * Same as SkFourByteInterp256, but faster.
- */
- static inline SkPMColor SkFastFourByteInterp256(SkPMColor src, SkPMColor dst, unsigned scale) {
- // On a 64-bit machine, _64 is about 10% faster than _32, but ~40% slower on a 32-bit machine.
- if (sizeof(void*) == 4) {
- return SkFastFourByteInterp256_32(src, dst, scale);
- } else {
- return SkFastFourByteInterp256_64(src, dst, scale);
- }
- }
- /**
- * Nearly the same as SkFourByteInterp, but faster and a touch more accurate, due to better
- * srcWeight scaling to [0, 256].
- */
- static inline SkPMColor SkFastFourByteInterp(SkPMColor src,
- SkPMColor dst,
- U8CPU srcWeight) {
- SkASSERT(srcWeight <= 255);
- // scale = srcWeight + (srcWeight >> 7) is more accurate than
- // scale = srcWeight + 1, but 7% slower
- return SkFastFourByteInterp256(src, dst, srcWeight + (srcWeight >> 7));
- }
- /**
- * Interpolates between colors src and dst using [0,256] scale.
- */
- static inline SkPMColor SkPMLerp(SkPMColor src, SkPMColor dst, unsigned scale) {
- return SkFastFourByteInterp256(src, dst, scale);
- }
- static inline SkPMColor SkBlendARGB32(SkPMColor src, SkPMColor dst, U8CPU aa) {
- SkASSERT((unsigned)aa <= 255);
- unsigned src_scale = SkAlpha255To256(aa);
- unsigned dst_scale = SkAlphaMulInv256(SkGetPackedA32(src), src_scale);
- const uint32_t mask = 0xFF00FF;
- uint32_t src_rb = (src & mask) * src_scale;
- uint32_t src_ag = ((src >> 8) & mask) * src_scale;
- uint32_t dst_rb = (dst & mask) * dst_scale;
- uint32_t dst_ag = ((dst >> 8) & mask) * dst_scale;
- return (((src_rb + dst_rb) >> 8) & mask) | ((src_ag + dst_ag) & ~mask);
- }
- ////////////////////////////////////////////////////////////////////////////////////////////
- // Convert a 32bit pixel to a 16bit pixel (no dither)
- #define SkR32ToR16_MACRO(r) ((unsigned)(r) >> (SK_R32_BITS - SK_R16_BITS))
- #define SkG32ToG16_MACRO(g) ((unsigned)(g) >> (SK_G32_BITS - SK_G16_BITS))
- #define SkB32ToB16_MACRO(b) ((unsigned)(b) >> (SK_B32_BITS - SK_B16_BITS))
- #ifdef SK_DEBUG
- static inline unsigned SkR32ToR16(unsigned r) {
- SkR32Assert(r);
- return SkR32ToR16_MACRO(r);
- }
- static inline unsigned SkG32ToG16(unsigned g) {
- SkG32Assert(g);
- return SkG32ToG16_MACRO(g);
- }
- static inline unsigned SkB32ToB16(unsigned b) {
- SkB32Assert(b);
- return SkB32ToB16_MACRO(b);
- }
- #else
- #define SkR32ToR16(r) SkR32ToR16_MACRO(r)
- #define SkG32ToG16(g) SkG32ToG16_MACRO(g)
- #define SkB32ToB16(b) SkB32ToB16_MACRO(b)
- #endif
- static inline U16CPU SkPixel32ToPixel16(SkPMColor c) {
- unsigned r = ((c >> (SK_R32_SHIFT + (8 - SK_R16_BITS))) & SK_R16_MASK) << SK_R16_SHIFT;
- unsigned g = ((c >> (SK_G32_SHIFT + (8 - SK_G16_BITS))) & SK_G16_MASK) << SK_G16_SHIFT;
- unsigned b = ((c >> (SK_B32_SHIFT + (8 - SK_B16_BITS))) & SK_B16_MASK) << SK_B16_SHIFT;
- return r | g | b;
- }
- static inline U16CPU SkPack888ToRGB16(U8CPU r, U8CPU g, U8CPU b) {
- return (SkR32ToR16(r) << SK_R16_SHIFT) |
- (SkG32ToG16(g) << SK_G16_SHIFT) |
- (SkB32ToB16(b) << SK_B16_SHIFT);
- }
- /////////////////////////////////////////////////////////////////////////////////////////
- /* SrcOver the 32bit src color with the 16bit dst, returning a 16bit value
- (with dirt in the high 16bits, so caller beware).
- */
- static inline U16CPU SkSrcOver32To16(SkPMColor src, uint16_t dst) {
- unsigned sr = SkGetPackedR32(src);
- unsigned sg = SkGetPackedG32(src);
- unsigned sb = SkGetPackedB32(src);
- unsigned dr = SkGetPackedR16(dst);
- unsigned dg = SkGetPackedG16(dst);
- unsigned db = SkGetPackedB16(dst);
- unsigned isa = 255 - SkGetPackedA32(src);
- dr = (sr + SkMul16ShiftRound(dr, isa, SK_R16_BITS)) >> (8 - SK_R16_BITS);
- dg = (sg + SkMul16ShiftRound(dg, isa, SK_G16_BITS)) >> (8 - SK_G16_BITS);
- db = (sb + SkMul16ShiftRound(db, isa, SK_B16_BITS)) >> (8 - SK_B16_BITS);
- return SkPackRGB16(dr, dg, db);
- }
- static inline SkColor SkPixel16ToColor(U16CPU src) {
- SkASSERT(src == SkToU16(src));
- unsigned r = SkPacked16ToR32(src);
- unsigned g = SkPacked16ToG32(src);
- unsigned b = SkPacked16ToB32(src);
- SkASSERT((r >> (8 - SK_R16_BITS)) == SkGetPackedR16(src));
- SkASSERT((g >> (8 - SK_G16_BITS)) == SkGetPackedG16(src));
- SkASSERT((b >> (8 - SK_B16_BITS)) == SkGetPackedB16(src));
- return SkColorSetRGB(r, g, b);
- }
- ///////////////////////////////////////////////////////////////////////////////
- typedef uint16_t SkPMColor16;
- // Put in OpenGL order (r g b a)
- #define SK_A4444_SHIFT 0
- #define SK_R4444_SHIFT 12
- #define SK_G4444_SHIFT 8
- #define SK_B4444_SHIFT 4
- static inline U8CPU SkReplicateNibble(unsigned nib) {
- SkASSERT(nib <= 0xF);
- return (nib << 4) | nib;
- }
- #define SkGetPackedA4444(c) (((unsigned)(c) >> SK_A4444_SHIFT) & 0xF)
- #define SkGetPackedR4444(c) (((unsigned)(c) >> SK_R4444_SHIFT) & 0xF)
- #define SkGetPackedG4444(c) (((unsigned)(c) >> SK_G4444_SHIFT) & 0xF)
- #define SkGetPackedB4444(c) (((unsigned)(c) >> SK_B4444_SHIFT) & 0xF)
- #define SkPacked4444ToA32(c) SkReplicateNibble(SkGetPackedA4444(c))
- static inline SkPMColor SkPixel4444ToPixel32(U16CPU c) {
- uint32_t d = (SkGetPackedA4444(c) << SK_A32_SHIFT) |
- (SkGetPackedR4444(c) << SK_R32_SHIFT) |
- (SkGetPackedG4444(c) << SK_G32_SHIFT) |
- (SkGetPackedB4444(c) << SK_B32_SHIFT);
- return d | (d << 4);
- }
- static inline Sk4f swizzle_rb(const Sk4f& x) {
- return SkNx_shuffle<2, 1, 0, 3>(x);
- }
- static inline Sk4f swizzle_rb_if_bgra(const Sk4f& x) {
- #ifdef SK_PMCOLOR_IS_BGRA
- return swizzle_rb(x);
- #else
- return x;
- #endif
- }
- static inline Sk4f Sk4f_fromL32(uint32_t px) {
- return SkNx_cast<float>(Sk4b::Load(&px)) * (1 / 255.0f);
- }
- static inline uint32_t Sk4f_toL32(const Sk4f& px) {
- Sk4f v = px;
- #if !defined(SKNX_NO_SIMD) && SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
- // SkNx_cast<uint8_t, int32_t>() pins, and we don't anticipate giant floats
- #elif !defined(SKNX_NO_SIMD) && defined(SK_ARM_HAS_NEON)
- // SkNx_cast<uint8_t, int32_t>() pins, and so does Sk4f_round().
- #else
- // No guarantee of a pin.
- v = Sk4f::Max(0, Sk4f::Min(v, 1));
- #endif
- uint32_t l32;
- SkNx_cast<uint8_t>(Sk4f_round(v * 255.0f)).store(&l32);
- return l32;
- }
- using SkPMColor4f = SkRGBA4f<kPremul_SkAlphaType>;
- constexpr SkPMColor4f SK_PMColor4fTRANSPARENT = { 0, 0, 0, 0 };
- constexpr SkPMColor4f SK_PMColor4fWHITE = { 1, 1, 1, 1 };
- constexpr SkPMColor4f SK_PMColor4fILLEGAL = { SK_FloatNegativeInfinity,
- SK_FloatNegativeInfinity,
- SK_FloatNegativeInfinity,
- SK_FloatNegativeInfinity };
- #endif
|