auto import from //depot/cupcake/@135843

1 files changed, 257 insertions, 0 deletions

diff --git a/src/effects/SkAvoidXfermode.cpp b/src/effects/SkAvoidXfermode.cpp
new file mode 100644
index 0000000..eed4012
--- /dev/null
+++ b/src/effects/SkAvoidXfermode.cpp
@@ -0,0 +1,257 @@
+/* libs/graphics/effects/SkAvoidXfermode.cpp
+**
+** Copyright 2006, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+#include "SkAvoidXfermode.h"
+#include "SkColorPriv.h"
+
+SkAvoidXfermode::SkAvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode)
+{    
+    if (tolerance > 255) {
+        tolerance = 255;
+    }
+
+    fOpColor = opColor;
+    fDistMul = (256 << 14) / (tolerance + 1);
+    fMode = mode;
+}
+
+SkAvoidXfermode::SkAvoidXfermode(SkFlattenableReadBuffer& buffer)
+    : INHERITED(buffer)
+{
+    fOpColor = buffer.readU32();
+    fDistMul = buffer.readU32();
+    fMode = (Mode)buffer.readU8();
+}
+
+void SkAvoidXfermode::flatten(SkFlattenableWriteBuffer& buffer)
+{
+    this->INHERITED::flatten(buffer);
+
+    buffer.write32(fOpColor);
+    buffer.write32(fDistMul);
+    buffer.write8(fMode);
+}
+
+SkFlattenable* SkAvoidXfermode::Create(SkFlattenableReadBuffer& rb)
+{
+    return SkNEW_ARGS(SkAvoidXfermode, (rb));
+}
+
+SkFlattenable::Factory SkAvoidXfermode::getFactory()
+{
+    return Create;
+}
+
+// returns 0..31
+static unsigned color_dist16(uint16_t c, unsigned r, unsigned g, unsigned b)
+{
+    SkASSERT(r <= SK_R16_MASK);
+    SkASSERT(g <= SK_G16_MASK);
+    SkASSERT(b <= SK_B16_MASK);
+
+    unsigned dr = SkAbs32(SkGetPackedR16(c) - r);
+    unsigned dg = SkAbs32(SkGetPackedG16(c) - g) >> (SK_G16_BITS - SK_R16_BITS);
+    unsigned db = SkAbs32(SkGetPackedB16(c) - b);
+    
+    return SkMax32(dr, SkMax32(dg, db));
+}
+
+// returns 0..15
+static unsigned color_dist4444(uint16_t c, unsigned r, unsigned g, unsigned b)
+{
+    SkASSERT(r <= 0xF);
+    SkASSERT(g <= 0xF);
+    SkASSERT(b <= 0xF);
+    
+    unsigned dr = SkAbs32(SkGetPackedR4444(c) - r);
+    unsigned dg = SkAbs32(SkGetPackedG4444(c) - g);
+    unsigned db = SkAbs32(SkGetPackedB4444(c) - b);
+    
+    return SkMax32(dr, SkMax32(dg, db));
+}
+
+// returns 0..255
+static unsigned color_dist32(SkPMColor c, U8CPU r, U8CPU g, U8CPU b)
+{
+    SkASSERT(r <= 0xFF);
+    SkASSERT(g <= 0xFF);
+    SkASSERT(b <= 0xFF);
+
+    unsigned dr = SkAbs32(SkGetPackedR32(c) - r);
+    unsigned dg = SkAbs32(SkGetPackedG32(c) - g);
+    unsigned db = SkAbs32(SkGetPackedB32(c) - b);
+    
+    return SkMax32(dr, SkMax32(dg, db));
+}
+
+static int scale_dist_14(int dist, uint32_t mul, uint32_t sub)
+{
+    int tmp = dist * mul - sub;
+    int result = (tmp + (1 << 13)) >> 14;
+
+    return result;
+}
+
+static SkPMColor SkFourByteInterp(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);
+}
+
+void SkAvoidXfermode::xfer32(SkPMColor dst[], const SkPMColor src[], int count,
+                             const SkAlpha aa[])
+{
+    unsigned    opR = SkColorGetR(fOpColor);
+    unsigned    opG = SkColorGetG(fOpColor);
+    unsigned    opB = SkColorGetB(fOpColor);
+    uint32_t    mul = fDistMul;
+    uint32_t    sub = (fDistMul - (1 << 14)) << 8;
+    
+    int MAX, mask;
+    
+    if (kTargetColor_Mode == fMode) {
+        mask = -1;
+        MAX = 255;
+    } else {
+        mask = 0;
+        MAX = 0;
+    }
+    
+    for (int i = 0; i < count; i++) {
+        int d = color_dist32(dst[i], opR, opG, opB);
+        // now reverse d if we need to
+        d = MAX + (d ^ mask) - mask;
+        SkASSERT((unsigned)d <= 255);
+        d = SkAlpha255To256(d);
+        
+        d = scale_dist_14(d, mul, sub);
+        SkASSERT(d <= 256);
+        
+        if (d > 0) {
+            if (NULL != aa) {
+                d = SkAlphaMul(d, SkAlpha255To256(*aa++));
+                if (0 == d) {
+                    continue;
+                }
+            }
+            dst[i] = SkFourByteInterp(src[i], dst[i], d);
+        }
+    }
+}
+
+static inline U16CPU SkBlend3216(SkPMColor src, U16CPU dst, unsigned scale)
+{
+    SkASSERT(scale <= 32);
+    scale <<= 3;
+
+    return SkPackRGB16( SkAlphaBlend(SkPacked32ToR16(src), SkGetPackedR16(dst), scale),
+                        SkAlphaBlend(SkPacked32ToG16(src), SkGetPackedG16(dst), scale),
+                        SkAlphaBlend(SkPacked32ToB16(src), SkGetPackedB16(dst), scale));
+}
+
+void SkAvoidXfermode::xfer16(uint16_t dst[], const SkPMColor src[], int count,
+                             const SkAlpha aa[])
+{
+    unsigned    opR = SkColorGetR(fOpColor) >> (8 - SK_R16_BITS);
+    unsigned    opG = SkColorGetG(fOpColor) >> (8 - SK_G16_BITS);
+    unsigned    opB = SkColorGetB(fOpColor) >> (8 - SK_R16_BITS);
+    uint32_t    mul = fDistMul;
+    uint32_t    sub = (fDistMul - (1 << 14)) << 8;
+
+    int MAX, mask;
+    
+    if (kTargetColor_Mode == fMode) {
+        mask = -1;
+        MAX = 31;
+    } else {
+        mask = 0;
+        MAX = 0;
+    }
+
+    for (int i = 0; i < count; i++) {
+        int d = color_dist16(dst[i], opR, opG, opB);
+        // now reverse d if we need to
+        d = MAX + (d ^ mask) - mask;
+        SkASSERT((unsigned)d <= 31);
+        // convert from 0..31 to 0..32
+        d += d >> 4;
+
+        d = scale_dist_14(d, mul, sub);
+        SkASSERT(d <= 32);
+
+        if (d > 0) {
+            if (NULL != aa) {
+                d = SkAlphaMul(d, SkAlpha255To256(*aa++));
+                if (0 == d) {
+                    continue;
+                }
+            }
+            dst[i] = SkBlend3216(src[i], dst[i], d);
+        }
+    }
+}
+
+void SkAvoidXfermode::xfer4444(uint16_t dst[], const SkPMColor src[], int count,
+                               const SkAlpha aa[])
+{
+    unsigned    opR = SkColorGetR(fOpColor) >> 4;
+    unsigned    opG = SkColorGetG(fOpColor) >> 4;
+    unsigned    opB = SkColorGetB(fOpColor) >> 4;
+    uint32_t    mul = fDistMul;
+    uint32_t    sub = (fDistMul - (1 << 14)) << 8;
+    
+    int MAX, mask;
+    
+    if (kTargetColor_Mode == fMode) {
+        mask = -1;
+        MAX = 15;
+    } else {
+        mask = 0;
+        MAX = 0;
+    }
+    
+    for (int i = 0; i < count; i++) {
+        int d = color_dist4444(dst[i], opR, opG, opB);
+        // now reverse d if we need to
+        d = MAX + (d ^ mask) - mask;
+        SkASSERT((unsigned)d <= 15);
+        d = SkAlpha255To256(d);
+        
+        d = scale_dist_14(d, mul, sub);
+        SkASSERT(d <= 16);
+        
+        if (d > 0) {
+            if (NULL != aa) {
+                d = SkAlphaMul(d, SkAlpha255To256(*aa++));
+                if (0 == d) {
+                    continue;
+                }
+            }
+            dst[i] = SkBlend4444(SkPixel32ToPixel4444(src[i]), dst[i], d);
+        }
+    }
+}
+
+void SkAvoidXfermode::xferA8(SkAlpha dst[], const SkPMColor src[], int count, const SkAlpha aa[])
+{
+    // override in subclass
+}
+