move SkDither.h to private, remove unused shadeSpan16

include/core/SkDither.h

-
-/*
- * Copyright 2008 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 SkDither_DEFINED
-#define SkDither_DEFINED
-
-#include "SkColorPriv.h"
-
-#define SK_DitherValueMax4444   15
-#define SK_DitherValueMax565    7
-
-/*  need to use macros for bit-counts for each component, and then
-    move these into SkColorPriv.h
-*/
-
-#define SkDITHER_R32_FOR_565_MACRO(r, d)    (r + d - (r >> 5))
-#define SkDITHER_G32_FOR_565_MACRO(g, d)    (g + (d >> 1) - (g >> 6))
-#define SkDITHER_B32_FOR_565_MACRO(b, d)    (b + d - (b >> 5))
-
-#define SkDITHER_A32_FOR_4444_MACRO(a, d)    (a + 15 - (a >> 4))
-#define SkDITHER_R32_FOR_4444_MACRO(r, d)    (r + d - (r >> 4))
-#define SkDITHER_G32_FOR_4444_MACRO(g, d)    (g + d - (g >> 4))
-#define SkDITHER_B32_FOR_4444_MACRO(b, d)    (b + d - (b >> 4))
-
-#ifdef SK_DEBUG
-    inline unsigned SkDITHER_R32_FOR_565(unsigned r, unsigned d)
-    {
-        SkASSERT(d <= SK_DitherValueMax565);
-        SkA32Assert(r);
-        r = SkDITHER_R32_FOR_565_MACRO(r, d);
-        SkA32Assert(r);
-        return r;
-    }
-    inline unsigned SkDITHER_G32_FOR_565(unsigned g, unsigned d)
-    {
-        SkASSERT(d <= SK_DitherValueMax565);
-        SkG32Assert(g);
-        g = SkDITHER_G32_FOR_565_MACRO(g, d);
-        SkG32Assert(g);
-        return g;
-    }
-    inline unsigned SkDITHER_B32_FOR_565(unsigned b, unsigned d)
-    {
-        SkASSERT(d <= SK_DitherValueMax565);
-        SkB32Assert(b);
-        b = SkDITHER_B32_FOR_565_MACRO(b, d);
-        SkB32Assert(b);
-        return b;
-    }
-#else
-    #define SkDITHER_R32_FOR_565(r, d)  SkDITHER_R32_FOR_565_MACRO(r, d)
-    #define SkDITHER_G32_FOR_565(g, d)  SkDITHER_G32_FOR_565_MACRO(g, d)
-    #define SkDITHER_B32_FOR_565(b, d)  SkDITHER_B32_FOR_565_MACRO(b, d)
-#endif
-
-#define SkDITHER_R32To565(r, d)  SkR32ToR16(SkDITHER_R32_FOR_565(r, d))
-#define SkDITHER_G32To565(g, d)  SkG32ToG16(SkDITHER_G32_FOR_565(g, d))
-#define SkDITHER_B32To565(b, d)  SkB32ToB16(SkDITHER_B32_FOR_565(b, d))
-
-#define SkDITHER_A32To4444(a, d)  SkA32To4444(SkDITHER_A32_FOR_4444_MACRO(a, d))
-#define SkDITHER_R32To4444(r, d)  SkR32To4444(SkDITHER_R32_FOR_4444_MACRO(r, d))
-#define SkDITHER_G32To4444(g, d)  SkG32To4444(SkDITHER_G32_FOR_4444_MACRO(g, d))
-#define SkDITHER_B32To4444(b, d)  SkB32To4444(SkDITHER_B32_FOR_4444_MACRO(b, d))
-
-static inline SkPMColor SkDitherARGB32For565(SkPMColor c, unsigned dither)
-{
-    SkASSERT(dither <= SK_DitherValueMax565);
-
-    unsigned sa = SkGetPackedA32(c);
-    dither = SkAlphaMul(dither, SkAlpha255To256(sa));
-
-    unsigned sr = SkGetPackedR32(c);
-    unsigned sg = SkGetPackedG32(c);
-    unsigned sb = SkGetPackedB32(c);
-    sr = SkDITHER_R32_FOR_565(sr, dither);
-    sg = SkDITHER_G32_FOR_565(sg, dither);
-    sb = SkDITHER_B32_FOR_565(sb, dither);
-
-    return SkPackARGB32(sa, sr, sg, sb);
-}
-
-static inline SkPMColor SkDitherRGB32For565(SkPMColor c, unsigned dither)
-{
-    SkASSERT(dither <= SK_DitherValueMax565);
-
-    unsigned sr = SkGetPackedR32(c);
-    unsigned sg = SkGetPackedG32(c);
-    unsigned sb = SkGetPackedB32(c);
-    sr = SkDITHER_R32_FOR_565(sr, dither);
-    sg = SkDITHER_G32_FOR_565(sg, dither);
-    sb = SkDITHER_B32_FOR_565(sb, dither);
-
-    return SkPackARGB32(0xFF, sr, sg, sb);
-}
-
-static inline uint16_t SkDitherRGBTo565(U8CPU r, U8CPU g, U8CPU b,
-                                              unsigned dither)
-{
-    SkASSERT(dither <= SK_DitherValueMax565);
-    r = SkDITHER_R32To565(r, dither);
-    g = SkDITHER_G32To565(g, dither);
-    b = SkDITHER_B32To565(b, dither);
-    return SkPackRGB16(r, g, b);
-}
-
-static inline uint16_t SkDitherRGB32To565(SkPMColor c, unsigned dither)
-{
-    SkASSERT(dither <= SK_DitherValueMax565);
-
-    unsigned sr = SkGetPackedR32(c);
-    unsigned sg = SkGetPackedG32(c);
-    unsigned sb = SkGetPackedB32(c);
-    sr = SkDITHER_R32To565(sr, dither);
-    sg = SkDITHER_G32To565(sg, dither);
-    sb = SkDITHER_B32To565(sb, dither);
-
-    return SkPackRGB16(sr, sg, sb);
-}
-
-static inline uint16_t SkDitherARGB32To565(U8CPU sa, SkPMColor c, unsigned dither)
-{
-    SkASSERT(dither <= SK_DitherValueMax565);
-    dither = SkAlphaMul(dither, SkAlpha255To256(sa));
-
-    unsigned sr = SkGetPackedR32(c);
-    unsigned sg = SkGetPackedG32(c);
-    unsigned sb = SkGetPackedB32(c);
-    sr = SkDITHER_R32To565(sr, dither);
-    sg = SkDITHER_G32To565(sg, dither);
-    sb = SkDITHER_B32To565(sb, dither);
-
-    return SkPackRGB16(sr, sg, sb);
-}
-
-///////////////////////// 4444
-
-static inline SkPMColor16 SkDitherARGB32To4444(U8CPU a, U8CPU r, U8CPU g,
-                                               U8CPU b, unsigned dither)
-{
-    dither = SkAlphaMul(dither, SkAlpha255To256(a));
-
-    a = SkDITHER_A32To4444(a, dither);
-    r = SkDITHER_R32To4444(r, dither);
-    g = SkDITHER_G32To4444(g, dither);
-    b = SkDITHER_B32To4444(b, dither);
-
-    return SkPackARGB4444(a, r, g, b);
-}
-
-static inline SkPMColor16 SkDitherARGB32To4444(SkPMColor c, unsigned dither)
-{
-    unsigned a = SkGetPackedA32(c);
-    unsigned r = SkGetPackedR32(c);
-    unsigned g = SkGetPackedG32(c);
-    unsigned b = SkGetPackedB32(c);
-
-    dither = SkAlphaMul(dither, SkAlpha255To256(a));
-
-    a = SkDITHER_A32To4444(a, dither);
-    r = SkDITHER_R32To4444(r, dither);
-    g = SkDITHER_G32To4444(g, dither);
-    b = SkDITHER_B32To4444(b, dither);
-
-    return SkPackARGB4444(a, r, g, b);
-}
-
-// TODO: need dither routines for 565 -> 4444
-
-// this toggles between a 4x4 and a 1x4 array
-//#define ENABLE_DITHER_MATRIX_4X4
-
-#ifdef ENABLE_DITHER_MATRIX_4X4
-    extern const uint8_t gDitherMatrix_4Bit_4X4[4][4];
-    extern const uint8_t gDitherMatrix_3Bit_4X4[4][4];
-
-    #define DITHER_4444_SCAN(y) const uint8_t* dither_scan = gDitherMatrix_4Bit_4X4[(y) & 3]
-    #define DITHER_565_SCAN(y)  const uint8_t* dither_scan = gDitherMatrix_3Bit_4X4[(y) & 3]
-
-    #define DITHER_VALUE(x) dither_scan[(x) & 3]
-#else
-    extern const uint16_t gDitherMatrix_4Bit_16[4];
-    extern const uint16_t gDitherMatrix_3Bit_16[4];
-
-    #define DITHER_4444_SCAN(y) const uint16_t dither_scan = gDitherMatrix_4Bit_16[(y) & 3]
-    #define DITHER_565_SCAN(y)  const uint16_t dither_scan = gDitherMatrix_3Bit_16[(y) & 3]
-
-    #define DITHER_VALUE(x) ((dither_scan >> (((x) & 3) << 2)) & 0xF)
-#endif
-
-#define DITHER_INC_X(x) ++(x)
-
-#endif