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

gfx/skia/trunk/src/core/SkComposeShader.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkComposeShader.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 "SkComposeShader.h"
 #include "SkColorFilter.h"
 #include "SkColorPriv.h"
 #include "SkColorShader.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkXfermode.h"
 #include "SkString.h"
 ///////////////////////////////////////////////////////////////////////////////
 SkComposeShader::SkComposeShader(SkShader* sA, SkShader* sB, SkXfermode* mode) {
     fShaderA = sA;  sA->ref();
     fShaderB = sB;  sB->ref();
     // mode may be null
     fMode = mode;
     SkSafeRef(mode);
 }
 SkComposeShader::SkComposeShader(SkReadBuffer& buffer) :
     INHERITED(buffer) {
     fShaderA = buffer.readShader();
     if (NULL == fShaderA) {
         fShaderA = SkNEW_ARGS(SkColorShader, (0));
     }
     fShaderB = buffer.readShader();
     if (NULL == fShaderB) {
         fShaderB = SkNEW_ARGS(SkColorShader, (0));
     }
     fMode = buffer.readXfermode();
 }
 SkComposeShader::~SkComposeShader() {
     SkSafeUnref(fMode);
     fShaderB->unref();
     fShaderA->unref();
 }
 class SkAutoAlphaRestore {
 public:
     SkAutoAlphaRestore(SkPaint* paint, uint8_t newAlpha) {
         fAlpha = paint->getAlpha();
         fPaint = paint;
         paint->setAlpha(newAlpha);
     }
     ~SkAutoAlphaRestore() {
         fPaint->setAlpha(fAlpha);
     }
 private:
     SkPaint*    fPaint;
     uint8_t     fAlpha;
 };
 #define SkAutoAlphaRestore(...) SK_REQUIRE_LOCAL_VAR(SkAutoAlphaRestore)
 void SkComposeShader::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writeFlattenable(fShaderA);
     buffer.writeFlattenable(fShaderB);
     buffer.writeFlattenable(fMode);
 }
 /*  We call setContext on our two worker shaders. However, we
     always let them see opaque alpha, and if the paint really
     is translucent, then we apply that after the fact.
     We need to keep the calls to setContext/endContext balanced, since if we
     return false, our endContext() will not be called.
  */
 bool SkComposeShader::setContext(const SkBitmap& device,
                                  const SkPaint& paint,
                                  const SkMatrix& matrix) {
     if (!this->INHERITED::setContext(device, paint, matrix)) {
         return false;
     }
     // we preconcat our localMatrix (if any) with the device matrix
     // before calling our sub-shaders
     SkMatrix tmpM;
     tmpM.setConcat(matrix, this->getLocalMatrix());
     SkAutoAlphaRestore  restore(const_cast<SkPaint*>(&paint), 0xFF);
     bool setContextA = fShaderA->setContext(device, paint, tmpM);
     bool setContextB = fShaderB->setContext(device, paint, tmpM);
     if (!setContextA || !setContextB) {
         if (setContextB) {
             fShaderB->endContext();
         }
         else if (setContextA) {
             fShaderA->endContext();
         }
         this->INHERITED::endContext();
         return false;
     }
     return true;
 }
 void SkComposeShader::endContext() {
     fShaderB->endContext();
     fShaderA->endContext();
     this->INHERITED::endContext();
 }
 // larger is better (fewer times we have to loop), but we shouldn't
 // take up too much stack-space (each element is 4 bytes)
 #define TMP_COLOR_COUNT     64
 void SkComposeShader::shadeSpan(int x, int y, SkPMColor result[], int count) {
     SkShader*   shaderA = fShaderA;
     SkShader*   shaderB = fShaderB;
     SkXfermode* mode = fMode;
     unsigned    scale = SkAlpha255To256(this->getPaintAlpha());
     SkPMColor   tmp[TMP_COLOR_COUNT];
     if (NULL == mode) {   // implied SRC_OVER
         // TODO: when we have a good test-case, should use SkBlitRow::Proc32
         // for these loops
         do {
             int n = count;
             if (n > TMP_COLOR_COUNT) {
                 n = TMP_COLOR_COUNT;
             }
             shaderA->shadeSpan(x, y, result, n);
             shaderB->shadeSpan(x, y, tmp, n);
             if (256 == scale) {
                 for (int i = 0; i < n; i++) {
                     result[i] = SkPMSrcOver(tmp[i], result[i]);
                 }
             } else {
                 for (int i = 0; i < n; i++) {
                     result[i] = SkAlphaMulQ(SkPMSrcOver(tmp[i], result[i]),
                                             scale);
                 }
             }
             result += n;
             x += n;
             count -= n;
         } while (count > 0);
     } else {    // use mode for the composition
         do {
             int n = count;
             if (n > TMP_COLOR_COUNT) {
                 n = TMP_COLOR_COUNT;
             }
             shaderA->shadeSpan(x, y, result, n);
             shaderB->shadeSpan(x, y, tmp, n);
             mode->xfer32(result, tmp, n, NULL);
             if (256 == scale) {
                 for (int i = 0; i < n; i++) {
                     result[i] = SkAlphaMulQ(result[i], scale);
                 }
             }
             result += n;
             x += n;
             count -= n;
         } while (count > 0);
     }
 }
 #ifndef SK_IGNORE_TO_STRING
 void SkComposeShader::toString(SkString* str) const {
     str->append("SkComposeShader: (");
     str->append("ShaderA: ");
     fShaderA->toString(str);
     str->append(" ShaderB: ");
     fShaderB->toString(str);
     str->append(" Xfermode: ");
     fMode->toString(str);
     this->INHERITED::toString(str);
     str->append(")");
 }
 #endif

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gfx/skia/trunk/src/core/SkComposeShader.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkComposeShader.cpp