2 * Copyright 2006 The Android Open Source Project
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #include "SkAvoidXfermode.h"
9 #include "SkColorPriv.h"
10 #include "SkReadBuffer.h"
11 #include "SkWriteBuffer.h"
14 SkAvoidXfermode::SkAvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode) {
15 if (tolerance > 255) {
18 fTolerance = SkToU8(tolerance);
20 fDistMul = (256 << 14) / (tolerance + 1);
24 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
25 SkAvoidXfermode::SkAvoidXfermode(SkReadBuffer& buffer) : INHERITED(buffer) {
26 fOpColor = buffer.readColor();
27 fDistMul = buffer.readUInt();
28 fMode = (Mode)buffer.readUInt();
32 SkFlattenable* SkAvoidXfermode::CreateProc(SkReadBuffer& buffer) {
33 const SkColor color = buffer.readColor();
34 const unsigned tolerance = buffer.readUInt();
35 const unsigned mode = buffer.readUInt();
36 return Create(color, tolerance, (Mode)mode);
39 void SkAvoidXfermode::flatten(SkWriteBuffer& buffer) const {
40 buffer.writeColor(fOpColor);
41 buffer.writeUInt(fTolerance);
42 buffer.writeUInt(fMode);
46 static unsigned color_dist16(uint16_t c, unsigned r, unsigned g, unsigned b) {
47 SkASSERT(r <= SK_R16_MASK);
48 SkASSERT(g <= SK_G16_MASK);
49 SkASSERT(b <= SK_B16_MASK);
51 unsigned dr = SkAbs32(SkGetPackedR16(c) - r);
52 unsigned dg = SkAbs32(SkGetPackedG16(c) - g) >> (SK_G16_BITS - SK_R16_BITS);
53 unsigned db = SkAbs32(SkGetPackedB16(c) - b);
55 return SkMax32(dr, SkMax32(dg, db));
59 static unsigned color_dist32(SkPMColor c, U8CPU r, U8CPU g, U8CPU b) {
64 unsigned dr = SkAbs32(SkGetPackedR32(c) - r);
65 unsigned dg = SkAbs32(SkGetPackedG32(c) - g);
66 unsigned db = SkAbs32(SkGetPackedB32(c) - b);
68 return SkMax32(dr, SkMax32(dg, db));
71 static int scale_dist_14(int dist, uint32_t mul, uint32_t sub) {
72 int tmp = dist * mul - sub;
73 int result = (tmp + (1 << 13)) >> 14;
78 static inline unsigned Accurate255To256(unsigned x) {
82 void SkAvoidXfermode::xfer32(SkPMColor dst[], const SkPMColor src[], int count,
83 const SkAlpha aa[]) const {
84 unsigned opR = SkColorGetR(fOpColor);
85 unsigned opG = SkColorGetG(fOpColor);
86 unsigned opB = SkColorGetB(fOpColor);
87 uint32_t mul = fDistMul;
88 uint32_t sub = (fDistMul - (1 << 14)) << 8;
92 if (kTargetColor_Mode == fMode) {
100 for (int i = 0; i < count; i++) {
101 int d = color_dist32(dst[i], opR, opG, opB);
102 // now reverse d if we need to
103 d = MAX + (d ^ mask) - mask;
104 SkASSERT((unsigned)d <= 255);
105 d = Accurate255To256(d);
107 d = scale_dist_14(d, mul, sub);
112 d = SkAlphaMul(d, Accurate255To256(*aa++));
117 dst[i] = SkFourByteInterp256(src[i], dst[i], d);
122 static inline U16CPU SkBlend3216(SkPMColor src, U16CPU dst, unsigned scale) {
123 SkASSERT(scale <= 32);
126 return SkPackRGB16( SkAlphaBlend(SkPacked32ToR16(src), SkGetPackedR16(dst), scale),
127 SkAlphaBlend(SkPacked32ToG16(src), SkGetPackedG16(dst), scale),
128 SkAlphaBlend(SkPacked32ToB16(src), SkGetPackedB16(dst), scale));
131 void SkAvoidXfermode::xfer16(uint16_t dst[], const SkPMColor src[], int count,
132 const SkAlpha aa[]) const {
133 unsigned opR = SkColorGetR(fOpColor) >> (8 - SK_R16_BITS);
134 unsigned opG = SkColorGetG(fOpColor) >> (8 - SK_G16_BITS);
135 unsigned opB = SkColorGetB(fOpColor) >> (8 - SK_R16_BITS);
136 uint32_t mul = fDistMul;
137 uint32_t sub = (fDistMul - (1 << 14)) << SK_R16_BITS;
141 if (kTargetColor_Mode == fMode) {
149 for (int i = 0; i < count; i++) {
150 int d = color_dist16(dst[i], opR, opG, opB);
151 // now reverse d if we need to
152 d = MAX + (d ^ mask) - mask;
153 SkASSERT((unsigned)d <= 31);
154 // convert from 0..31 to 0..32
156 d = scale_dist_14(d, mul, sub);
161 d = SkAlphaMul(d, Accurate255To256(*aa++));
166 dst[i] = SkBlend3216(src[i], dst[i], d);
171 void SkAvoidXfermode::xferA8(SkAlpha dst[], const SkPMColor src[], int count,
172 const SkAlpha aa[]) const {
173 // override in subclass
176 #ifndef SK_IGNORE_TO_STRING
177 void SkAvoidXfermode::toString(SkString* str) const {
178 str->append("SkAvoidXfermode: opColor: ");
179 str->appendHex(fOpColor);
180 str->appendf("distMul: %d ", fDistMul);
182 static const char* gModeStrings[] = { "Avoid", "Target" };
184 str->appendf("mode: %s", gModeStrings[fMode]);