Leon Scroggins III | 626647c | 2015-01-29 13:46:57 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
Leon Scroggins III | ed1ce37 | 2015-01-30 09:05:11 -0500 | [diff] [blame] | 8 | #include "AvoidXfermode.h" |
Leon Scroggins III | 626647c | 2015-01-29 13:46:57 -0500 | [diff] [blame] | 9 | #include "SkColorPriv.h" |
| 10 | #include "SkReadBuffer.h" |
| 11 | #include "SkWriteBuffer.h" |
| 12 | #include "SkString.h" |
| 13 | |
Leon Scroggins III | ed1ce37 | 2015-01-30 09:05:11 -0500 | [diff] [blame] | 14 | AvoidXfermode::AvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode) { |
Leon Scroggins III | 626647c | 2015-01-29 13:46:57 -0500 | [diff] [blame] | 15 | if (tolerance > 255) { |
| 16 | tolerance = 255; |
| 17 | } |
| 18 | fTolerance = SkToU8(tolerance); |
| 19 | fOpColor = opColor; |
| 20 | fDistMul = (256 << 14) / (tolerance + 1); |
| 21 | fMode = mode; |
| 22 | } |
| 23 | |
Leon Scroggins III | ed1ce37 | 2015-01-30 09:05:11 -0500 | [diff] [blame] | 24 | SkFlattenable* AvoidXfermode::CreateProc(SkReadBuffer& buffer) { |
Leon Scroggins III | 626647c | 2015-01-29 13:46:57 -0500 | [diff] [blame] | 25 | const SkColor color = buffer.readColor(); |
| 26 | const unsigned tolerance = buffer.readUInt(); |
| 27 | const unsigned mode = buffer.readUInt(); |
| 28 | return Create(color, tolerance, (Mode)mode); |
| 29 | } |
| 30 | |
Leon Scroggins III | ed1ce37 | 2015-01-30 09:05:11 -0500 | [diff] [blame] | 31 | void AvoidXfermode::flatten(SkWriteBuffer& buffer) const { |
Leon Scroggins III | 626647c | 2015-01-29 13:46:57 -0500 | [diff] [blame] | 32 | buffer.writeColor(fOpColor); |
| 33 | buffer.writeUInt(fTolerance); |
| 34 | buffer.writeUInt(fMode); |
| 35 | } |
| 36 | |
| 37 | // returns 0..31 |
| 38 | static unsigned color_dist16(uint16_t c, unsigned r, unsigned g, unsigned b) { |
| 39 | SkASSERT(r <= SK_R16_MASK); |
| 40 | SkASSERT(g <= SK_G16_MASK); |
| 41 | SkASSERT(b <= SK_B16_MASK); |
| 42 | |
| 43 | unsigned dr = SkAbs32(SkGetPackedR16(c) - r); |
| 44 | unsigned dg = SkAbs32(SkGetPackedG16(c) - g) >> (SK_G16_BITS - SK_R16_BITS); |
| 45 | unsigned db = SkAbs32(SkGetPackedB16(c) - b); |
| 46 | |
| 47 | return SkMax32(dr, SkMax32(dg, db)); |
| 48 | } |
| 49 | |
| 50 | // returns 0..255 |
| 51 | static unsigned color_dist32(SkPMColor c, U8CPU r, U8CPU g, U8CPU b) { |
| 52 | SkASSERT(r <= 0xFF); |
| 53 | SkASSERT(g <= 0xFF); |
| 54 | SkASSERT(b <= 0xFF); |
| 55 | |
| 56 | unsigned dr = SkAbs32(SkGetPackedR32(c) - r); |
| 57 | unsigned dg = SkAbs32(SkGetPackedG32(c) - g); |
| 58 | unsigned db = SkAbs32(SkGetPackedB32(c) - b); |
| 59 | |
| 60 | return SkMax32(dr, SkMax32(dg, db)); |
| 61 | } |
| 62 | |
| 63 | static int scale_dist_14(int dist, uint32_t mul, uint32_t sub) { |
| 64 | int tmp = dist * mul - sub; |
| 65 | int result = (tmp + (1 << 13)) >> 14; |
| 66 | |
| 67 | return result; |
| 68 | } |
| 69 | |
| 70 | static inline unsigned Accurate255To256(unsigned x) { |
| 71 | return x + (x >> 7); |
| 72 | } |
| 73 | |
Leon Scroggins III | ed1ce37 | 2015-01-30 09:05:11 -0500 | [diff] [blame] | 74 | void AvoidXfermode::xfer32(SkPMColor dst[], const SkPMColor src[], int count, |
Leon Scroggins III | 626647c | 2015-01-29 13:46:57 -0500 | [diff] [blame] | 75 | const SkAlpha aa[]) const { |
| 76 | unsigned opR = SkColorGetR(fOpColor); |
| 77 | unsigned opG = SkColorGetG(fOpColor); |
| 78 | unsigned opB = SkColorGetB(fOpColor); |
| 79 | uint32_t mul = fDistMul; |
| 80 | uint32_t sub = (fDistMul - (1 << 14)) << 8; |
| 81 | |
| 82 | int MAX, mask; |
| 83 | |
| 84 | if (kTargetColor_Mode == fMode) { |
| 85 | mask = -1; |
| 86 | MAX = 255; |
| 87 | } else { |
| 88 | mask = 0; |
| 89 | MAX = 0; |
| 90 | } |
| 91 | |
| 92 | for (int i = 0; i < count; i++) { |
| 93 | int d = color_dist32(dst[i], opR, opG, opB); |
| 94 | // now reverse d if we need to |
| 95 | d = MAX + (d ^ mask) - mask; |
| 96 | SkASSERT((unsigned)d <= 255); |
| 97 | d = Accurate255To256(d); |
| 98 | |
| 99 | d = scale_dist_14(d, mul, sub); |
| 100 | SkASSERT(d <= 256); |
| 101 | |
| 102 | if (d > 0) { |
| 103 | if (aa) { |
| 104 | d = SkAlphaMul(d, Accurate255To256(*aa++)); |
| 105 | if (0 == d) { |
| 106 | continue; |
| 107 | } |
| 108 | } |
| 109 | dst[i] = SkFourByteInterp256(src[i], dst[i], d); |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | static inline U16CPU SkBlend3216(SkPMColor src, U16CPU dst, unsigned scale) { |
| 115 | SkASSERT(scale <= 32); |
| 116 | scale <<= 3; |
| 117 | |
| 118 | return SkPackRGB16( SkAlphaBlend(SkPacked32ToR16(src), SkGetPackedR16(dst), scale), |
| 119 | SkAlphaBlend(SkPacked32ToG16(src), SkGetPackedG16(dst), scale), |
| 120 | SkAlphaBlend(SkPacked32ToB16(src), SkGetPackedB16(dst), scale)); |
| 121 | } |
| 122 | |
Leon Scroggins III | ed1ce37 | 2015-01-30 09:05:11 -0500 | [diff] [blame] | 123 | void AvoidXfermode::xfer16(uint16_t dst[], const SkPMColor src[], int count, |
Leon Scroggins III | 626647c | 2015-01-29 13:46:57 -0500 | [diff] [blame] | 124 | const SkAlpha aa[]) const { |
| 125 | unsigned opR = SkColorGetR(fOpColor) >> (8 - SK_R16_BITS); |
| 126 | unsigned opG = SkColorGetG(fOpColor) >> (8 - SK_G16_BITS); |
| 127 | unsigned opB = SkColorGetB(fOpColor) >> (8 - SK_R16_BITS); |
| 128 | uint32_t mul = fDistMul; |
| 129 | uint32_t sub = (fDistMul - (1 << 14)) << SK_R16_BITS; |
| 130 | |
| 131 | int MAX, mask; |
| 132 | |
| 133 | if (kTargetColor_Mode == fMode) { |
| 134 | mask = -1; |
| 135 | MAX = 31; |
| 136 | } else { |
| 137 | mask = 0; |
| 138 | MAX = 0; |
| 139 | } |
| 140 | |
| 141 | for (int i = 0; i < count; i++) { |
| 142 | int d = color_dist16(dst[i], opR, opG, opB); |
| 143 | // now reverse d if we need to |
| 144 | d = MAX + (d ^ mask) - mask; |
| 145 | SkASSERT((unsigned)d <= 31); |
| 146 | // convert from 0..31 to 0..32 |
| 147 | d += d >> 4; |
| 148 | d = scale_dist_14(d, mul, sub); |
| 149 | SkASSERT(d <= 32); |
| 150 | |
| 151 | if (d > 0) { |
| 152 | if (aa) { |
| 153 | d = SkAlphaMul(d, Accurate255To256(*aa++)); |
| 154 | if (0 == d) { |
| 155 | continue; |
| 156 | } |
| 157 | } |
| 158 | dst[i] = SkBlend3216(src[i], dst[i], d); |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | |
Leon Scroggins III | ed1ce37 | 2015-01-30 09:05:11 -0500 | [diff] [blame] | 163 | void AvoidXfermode::xferA8(SkAlpha dst[], const SkPMColor src[], int count, |
| 164 | const SkAlpha aa[]) const { |
Leon Scroggins III | 626647c | 2015-01-29 13:46:57 -0500 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | #ifndef SK_IGNORE_TO_STRING |
Leon Scroggins III | ed1ce37 | 2015-01-30 09:05:11 -0500 | [diff] [blame] | 168 | void AvoidXfermode::toString(SkString* str) const { |
| 169 | str->append("AvoidXfermode: opColor: "); |
Leon Scroggins III | 626647c | 2015-01-29 13:46:57 -0500 | [diff] [blame] | 170 | str->appendHex(fOpColor); |
| 171 | str->appendf("distMul: %d ", fDistMul); |
| 172 | |
| 173 | static const char* gModeStrings[] = { "Avoid", "Target" }; |
| 174 | |
| 175 | str->appendf("mode: %s", gModeStrings[fMode]); |
| 176 | } |
| 177 | #endif |