The Tor Browser: gfx/skia/trunk/src/effects/SkAvoidXfermode.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/effects/SkAvoidXfermode.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/effects/SkAvoidXfermode.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  * 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.
  */
 #include "SkAvoidXfermode.h"
 #include "SkColorPriv.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkString.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(SkReadBuffer& buffer)
     : INHERITED(buffer) {
     fOpColor = buffer.readColor();
     fDistMul = buffer.readUInt();
     fMode = (Mode)buffer.readUInt();
 }
 void SkAvoidXfermode::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writeColor(fOpColor);
     buffer.writeUInt(fDistMul);
     buffer.writeUInt(fMode);
 }
 // 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..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 inline unsigned Accurate255To256(unsigned x) {
     return x + (x >> 7);
 }
 void SkAvoidXfermode::xfer32(SkPMColor dst[], const SkPMColor src[], int count,
                              const SkAlpha aa[]) const {
     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 = Accurate255To256(d);
         d = scale_dist_14(d, mul, sub);
         SkASSERT(d <= 256);
         if (d > 0) {
             if (NULL != aa) {
                 d = SkAlphaMul(d, Accurate255To256(*aa++));
                 if (0 == d) {
                     continue;
                 }
             }
             dst[i] = SkFourByteInterp256(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[]) const {
     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)) << SK_R16_BITS;
     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, Accurate255To256(*aa++));
                 if (0 == d) {
                     continue;
                 }
             }
             dst[i] = SkBlend3216(src[i], dst[i], d);
         }
     }
 }
 void SkAvoidXfermode::xferA8(SkAlpha dst[], const SkPMColor src[], int count,
                              const SkAlpha aa[]) const {
     // override in subclass
 }
 #ifndef SK_IGNORE_TO_STRING
 void SkAvoidXfermode::toString(SkString* str) const {
     str->append("SkAvoidXfermode: opColor: ");
     str->appendHex(fOpColor);
     str->appendf("distMul: %d ", fDistMul);
     static const char* gModeStrings[] = { "Avoid", "Target" };
     str->appendf("mode: %s", gModeStrings[fMode]);
 }
 #endif

The Tor Browser / annotate

gfx/skia/trunk/src/effects/SkAvoidXfermode.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/effects/SkAvoidXfermode.cpp