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

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

gfx/skia/trunk/src/core/SkMipMap.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 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkMipMap.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
 static void downsampleby2_proc32(SkBitmap* dst, int x, int y,
                                  const SkBitmap& src) {
     x <<= 1;
     y <<= 1;
     const SkPMColor* p = src.getAddr32(x, y);
     const SkPMColor* baseP = p;
     SkPMColor c, ag, rb;
     c = *p; ag = (c >> 8) & 0xFF00FF; rb = c & 0xFF00FF;
     if (x < src.width() - 1) {
         p += 1;
     }
     c = *p; ag += (c >> 8) & 0xFF00FF; rb += c & 0xFF00FF;
     p = baseP;
     if (y < src.height() - 1) {
         p += src.rowBytes() >> 2;
     }
     c = *p; ag += (c >> 8) & 0xFF00FF; rb += c & 0xFF00FF;
     if (x < src.width() - 1) {
         p += 1;
     }
     c = *p; ag += (c >> 8) & 0xFF00FF; rb += c & 0xFF00FF;
     *dst->getAddr32(x >> 1, y >> 1) =
     ((rb >> 2) & 0xFF00FF) | ((ag << 6) & 0xFF00FF00);
 }
 static inline uint32_t expand16(U16CPU c) {
     return (c & ~SK_G16_MASK_IN_PLACE) | ((c & SK_G16_MASK_IN_PLACE) << 16);
 }
 // returns dirt in the top 16bits, but we don't care, since we only
 // store the low 16bits.
 static inline U16CPU pack16(uint32_t c) {
     return (c & ~SK_G16_MASK_IN_PLACE) | ((c >> 16) & SK_G16_MASK_IN_PLACE);
 }
 static void downsampleby2_proc16(SkBitmap* dst, int x, int y,
                                  const SkBitmap& src) {
     x <<= 1;
     y <<= 1;
     const uint16_t* p = src.getAddr16(x, y);
     const uint16_t* baseP = p;
     SkPMColor       c;
     c = expand16(*p);
     if (x < src.width() - 1) {
         p += 1;
     }
     c += expand16(*p);
     p = baseP;
     if (y < src.height() - 1) {
         p += src.rowBytes() >> 1;
     }
     c += expand16(*p);
     if (x < src.width() - 1) {
         p += 1;
     }
     c += expand16(*p);
     *dst->getAddr16(x >> 1, y >> 1) = (uint16_t)pack16(c >> 2);
 }
 static uint32_t expand4444(U16CPU c) {
     return (c & 0xF0F) | ((c & ~0xF0F) << 12);
 }
 static U16CPU collaps4444(uint32_t c) {
     return (c & 0xF0F) | ((c >> 12) & ~0xF0F);
 }
 static void downsampleby2_proc4444(SkBitmap* dst, int x, int y,
                                    const SkBitmap& src) {
     x <<= 1;
     y <<= 1;
     const uint16_t* p = src.getAddr16(x, y);
     const uint16_t* baseP = p;
     uint32_t        c;
     c = expand4444(*p);
     if (x < src.width() - 1) {
         p += 1;
     }
     c += expand4444(*p);
     p = baseP;
     if (y < src.height() - 1) {
         p += src.rowBytes() >> 1;
     }
     c += expand4444(*p);
     if (x < src.width() - 1) {
         p += 1;
     }
     c += expand4444(*p);
     *dst->getAddr16(x >> 1, y >> 1) = (uint16_t)collaps4444(c >> 2);
 }
 SkMipMap::Level* SkMipMap::AllocLevels(int levelCount, size_t pixelSize) {
     if (levelCount < 0) {
         return NULL;
     }
     int64_t size = sk_64_mul(levelCount + 1, sizeof(Level)) + pixelSize;
     if (!sk_64_isS32(size)) {
         return NULL;
     }
     return (Level*)sk_malloc_throw(sk_64_asS32(size));
 }
 SkMipMap* SkMipMap::Build(const SkBitmap& src) {
     void (*proc)(SkBitmap* dst, int x, int y, const SkBitmap& src);
     const SkBitmap::Config config = src.config();
     switch (config) {
         case SkBitmap::kARGB_8888_Config:
             proc = downsampleby2_proc32;
             break;
         case SkBitmap::kRGB_565_Config:
             proc = downsampleby2_proc16;
             break;
         case SkBitmap::kARGB_4444_Config:
             proc = downsampleby2_proc4444;
             break;
         case SkBitmap::kIndex8_Config:
         case SkBitmap::kA8_Config:
         default:
             return NULL; // don't build mipmaps for these configs
     }
     SkAutoLockPixels alp(src);
     if (!src.readyToDraw()) {
         return NULL;
     }
     // whip through our loop to compute the exact size needed
     size_t  size = 0;
     int     countLevels = 0;
     {
         int width = src.width();
         int height = src.height();
         for (;;) {
             width >>= 1;
             height >>= 1;
             if (0 == width || 0 == height) {
                 break;
             }
             size += SkBitmap::ComputeRowBytes(config, width) * height;
             countLevels += 1;
         }
     }
     if (0 == countLevels) {
         return NULL;
     }
     Level* levels = SkMipMap::AllocLevels(countLevels, size);
     if (NULL == levels) {
         return NULL;
     }
     uint8_t*    baseAddr = (uint8_t*)&levels[countLevels];
     uint8_t*    addr = baseAddr;
     int         width = src.width();
     int         height = src.height();
     uint32_t    rowBytes;
     SkBitmap    srcBM(src);
     for (int i = 0; i < countLevels; ++i) {
         width >>= 1;
         height >>= 1;
         rowBytes = SkToU32(SkBitmap::ComputeRowBytes(config, width));
         levels[i].fPixels   = addr;
         levels[i].fWidth    = width;
         levels[i].fHeight   = height;
         levels[i].fRowBytes = rowBytes;
         levels[i].fScale    = (float)width / src.width();
         SkBitmap dstBM;
         dstBM.setConfig(config, width, height, rowBytes);
         dstBM.setPixels(addr);
         srcBM.lockPixels();
         for (int y = 0; y < height; y++) {
             for (int x = 0; x < width; x++) {
                 proc(&dstBM, x, y, srcBM);
             }
         }
         srcBM.unlockPixels();
         srcBM = dstBM;
         addr += height * rowBytes;
     }
     SkASSERT(addr == baseAddr + size);
     return SkNEW_ARGS(SkMipMap, (levels, countLevels, size));
 }
 ///////////////////////////////////////////////////////////////////////////////
 //static int gCounter;
 SkMipMap::SkMipMap(Level* levels, int count, size_t size)
     : fSize(size), fLevels(levels), fCount(count) {
     SkASSERT(levels);
     SkASSERT(count > 0);
 //    SkDebugf("mips %d\n", ++gCounter);
 }
 SkMipMap::~SkMipMap() {
     sk_free(fLevels);
 //    SkDebugf("mips %d\n", --gCounter);
 }
 static SkFixed compute_level(SkScalar scale) {
     SkFixed s = SkAbs32(SkScalarToFixed(SkScalarInvert(scale)));
     if (s < SK_Fixed1) {
         return 0;
     }
     int clz = SkCLZ(s);
     SkASSERT(clz >= 1 && clz <= 15);
     return SkIntToFixed(15 - clz) + ((unsigned)(s << (clz + 1)) >> 16);
 }
 bool SkMipMap::extractLevel(SkScalar scale, Level* levelPtr) const {
     if (scale >= SK_Scalar1) {
         return false;
     }
     int level = compute_level(scale) >> 16;
     SkASSERT(level >= 0);
     if (level <= 0) {
         return false;
     }
     if (level > fCount) {
         level = fCount;
     }
     if (levelPtr) {
         *levelPtr = fLevels[level - 1];
     }
     return true;
 }

The Tor Browser / annotate

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

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