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

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

gfx/skia/trunk/src/core/SkBitmap.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 2008 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 "SkBitmap.h"
 #include "SkColorPriv.h"
 #include "SkDither.h"
 #include "SkFlattenable.h"
 #include "SkImagePriv.h"
 #include "SkMallocPixelRef.h"
 #include "SkMask.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkPixelRef.h"
 #include "SkThread.h"
 #include "SkUnPreMultiply.h"
 #include "SkUtils.h"
 #include "SkValidationUtils.h"
 #include "SkPackBits.h"
 #include <new>
 static bool reset_return_false(SkBitmap* bm) {
     bm->reset();
     return false;
 }
 struct MipLevel {
     void*       fPixels;
     uint32_t    fRowBytes;
     uint32_t    fWidth, fHeight;
 };
 struct SkBitmap::MipMap : SkNoncopyable {
     int32_t fRefCnt;
     int     fLevelCount;
 //  MipLevel    fLevel[fLevelCount];
 //  Pixels[]
     static MipMap* Alloc(int levelCount, size_t pixelSize) {
         if (levelCount < 0) {
             return NULL;
         }
         int64_t size = (levelCount + 1) * sizeof(MipLevel);
         size += sizeof(MipMap) + pixelSize;
         if (!sk_64_isS32(size)) {
             return NULL;
         }
         MipMap* mm = (MipMap*)sk_malloc_throw(sk_64_asS32(size));
         mm->fRefCnt = 1;
         mm->fLevelCount = levelCount;
         return mm;
     }
     const MipLevel* levels() const { return (const MipLevel*)(this + 1); }
     MipLevel* levels() { return (MipLevel*)(this + 1); }
     const void* pixels() const { return levels() + fLevelCount; }
     void* pixels() { return levels() + fLevelCount; }
     void ref() {
         if (SK_MaxS32 == sk_atomic_inc(&fRefCnt)) {
             sk_throw();
         }
     }
     void unref() {
         SkASSERT(fRefCnt > 0);
         if (sk_atomic_dec(&fRefCnt) == 1) {
             sk_free(this);
         }
     }
 };
 ///////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////
 SkBitmap::SkBitmap() {
     sk_bzero(this, sizeof(*this));
 }
 SkBitmap::SkBitmap(const SkBitmap& src) {
     SkDEBUGCODE(src.validate();)
     sk_bzero(this, sizeof(*this));
     *this = src;
     SkDEBUGCODE(this->validate();)
 }
 SkBitmap::~SkBitmap() {
     SkDEBUGCODE(this->validate();)
     this->freePixels();
 }
 SkBitmap& SkBitmap::operator=(const SkBitmap& src) {
     if (this != &src) {
         this->freePixels();
         memcpy(this, &src, sizeof(src));
         // inc src reference counts
         SkSafeRef(src.fPixelRef);
         SkSafeRef(src.fMipMap);
         // we reset our locks if we get blown away
         fPixelLockCount = 0;
         if (fPixelRef) {
             // ignore the values from the memcpy
             fPixels = NULL;
             fColorTable = NULL;
             // Note that what to for genID is somewhat arbitrary. We have no
             // way to track changes to raw pixels across multiple SkBitmaps.
             // Would benefit from an SkRawPixelRef type created by
             // setPixels.
             // Just leave the memcpy'ed one but they'll get out of sync
             // as soon either is modified.
         }
     }
     SkDEBUGCODE(this->validate();)
     return *this;
 }
 void SkBitmap::swap(SkBitmap& other) {
     SkTSwap(fColorTable, other.fColorTable);
     SkTSwap(fPixelRef, other.fPixelRef);
     SkTSwap(fPixelRefOrigin, other.fPixelRefOrigin);
     SkTSwap(fPixelLockCount, other.fPixelLockCount);
     SkTSwap(fMipMap, other.fMipMap);
     SkTSwap(fPixels, other.fPixels);
     SkTSwap(fInfo, other.fInfo);
     SkTSwap(fRowBytes, other.fRowBytes);
     SkTSwap(fFlags, other.fFlags);
     SkDEBUGCODE(this->validate();)
 }
 void SkBitmap::reset() {
     this->freePixels();
     sk_bzero(this, sizeof(*this));
 }
 SkBitmap::Config SkBitmap::config() const {
     return SkColorTypeToBitmapConfig(fInfo.colorType());
 }
 int SkBitmap::ComputeBytesPerPixel(SkBitmap::Config config) {
     int bpp;
     switch (config) {
         case kNo_Config:
             bpp = 0;   // not applicable
             break;
         case kA8_Config:
         case kIndex8_Config:
             bpp = 1;
             break;
         case kRGB_565_Config:
         case kARGB_4444_Config:
             bpp = 2;
             break;
         case kARGB_8888_Config:
             bpp = 4;
             break;
         default:
             SkDEBUGFAIL("unknown config");
             bpp = 0;   // error
             break;
     }
     return bpp;
 }
 size_t SkBitmap::ComputeRowBytes(Config c, int width) {
     return SkColorTypeMinRowBytes(SkBitmapConfigToColorType(c), width);
 }
 int64_t SkBitmap::ComputeSize64(Config config, int width, int height) {
     SkColorType ct = SkBitmapConfigToColorType(config);
     int64_t rowBytes = sk_64_mul(SkColorTypeBytesPerPixel(ct), width);
     return rowBytes * height;
 }
 size_t SkBitmap::ComputeSize(Config c, int width, int height) {
     int64_t size = SkBitmap::ComputeSize64(c, width, height);
     return sk_64_isS32(size) ? sk_64_asS32(size) : 0;
 }
 int64_t SkBitmap::ComputeSafeSize64(Config config,
                                     uint32_t width,
                                     uint32_t height,
                                     size_t rowBytes) {
     SkImageInfo info = SkImageInfo::Make(width, height,
                                          SkBitmapConfigToColorType(config),
                                          kPremul_SkAlphaType);
     return info.getSafeSize64(rowBytes);
 }
 size_t SkBitmap::ComputeSafeSize(Config config,
                                  uint32_t width,
                                  uint32_t height,
                                  size_t rowBytes) {
     int64_t safeSize = ComputeSafeSize64(config, width, height, rowBytes);
     int32_t safeSize32 = (int32_t)safeSize;
     if (safeSize32 != safeSize) {
         safeSize32 = 0;
     }
     return safeSize32;
 }
 void SkBitmap::getBounds(SkRect* bounds) const {
     SkASSERT(bounds);
     bounds->set(0, 0,
                 SkIntToScalar(fInfo.fWidth), SkIntToScalar(fInfo.fHeight));
 }
 void SkBitmap::getBounds(SkIRect* bounds) const {
     SkASSERT(bounds);
     bounds->set(0, 0, fInfo.fWidth, fInfo.fHeight);
 }
 ///////////////////////////////////////////////////////////////////////////////
 static bool validate_alphaType(SkColorType colorType, SkAlphaType alphaType,
                                SkAlphaType* canonical = NULL) {
     switch (colorType) {
         case kUnknown_SkColorType:
             alphaType = kIgnore_SkAlphaType;
             break;
         case kAlpha_8_SkColorType:
             if (kUnpremul_SkAlphaType == alphaType) {
                 alphaType = kPremul_SkAlphaType;
             }
             // fall-through
         case kIndex_8_SkColorType:
         case kARGB_4444_SkColorType:
         case kRGBA_8888_SkColorType:
         case kBGRA_8888_SkColorType:
             if (kIgnore_SkAlphaType == alphaType) {
                 return false;
             }
             break;
         case kRGB_565_SkColorType:
             alphaType = kOpaque_SkAlphaType;
             break;
         default:
             return false;
     }
     if (canonical) {
         *canonical = alphaType;
     }
     return true;
 }
 bool SkBitmap::setConfig(const SkImageInfo& origInfo, size_t rowBytes) {
     SkImageInfo info = origInfo;
     if (!validate_alphaType(info.fColorType, info.fAlphaType,
                             &info.fAlphaType)) {
         return reset_return_false(this);
     }
     // require that rowBytes fit in 31bits
     int64_t mrb = info.minRowBytes64();
     if ((int32_t)mrb != mrb) {
         return reset_return_false(this);
     }
     if ((int64_t)rowBytes != (int32_t)rowBytes) {
         return reset_return_false(this);
     }
     if (info.width() < 0 || info.height() < 0) {
         return reset_return_false(this);
     }
     if (kUnknown_SkColorType == info.colorType()) {
         rowBytes = 0;
     } else if (0 == rowBytes) {
         rowBytes = (size_t)mrb;
     } else if (rowBytes < info.minRowBytes()) {
         return reset_return_false(this);
     }
     this->freePixels();
     fInfo = info;
     fRowBytes = SkToU32(rowBytes);
     return true;
 }
 bool SkBitmap::setConfig(Config config, int width, int height, size_t rowBytes,
                          SkAlphaType alphaType) {
     SkColorType ct = SkBitmapConfigToColorType(config);
     return this->setConfig(SkImageInfo::Make(width, height, ct, alphaType),
                            rowBytes);
 }
 bool SkBitmap::setAlphaType(SkAlphaType alphaType) {
     if (!validate_alphaType(fInfo.fColorType, alphaType, &alphaType)) {
         return false;
     }
     if (fInfo.fAlphaType != alphaType) {
         fInfo.fAlphaType = alphaType;
         if (fPixelRef) {
             fPixelRef->changeAlphaType(alphaType);
         }
     }
     return true;
 }
 void SkBitmap::updatePixelsFromRef() const {
     if (NULL != fPixelRef) {
         if (fPixelLockCount > 0) {
             SkASSERT(fPixelRef->isLocked());
             void* p = fPixelRef->pixels();
             if (NULL != p) {
                 p = (char*)p
                     + fPixelRefOrigin.fY * fRowBytes
                     + fPixelRefOrigin.fX * fInfo.bytesPerPixel();
             }
             fPixels = p;
             fColorTable = fPixelRef->colorTable();
         } else {
             SkASSERT(0 == fPixelLockCount);
             fPixels = NULL;
             fColorTable = NULL;
         }
     }
 }
 static bool config_to_colorType(SkBitmap::Config config, SkColorType* ctOut) {
     SkColorType ct;
     switch (config) {
         case SkBitmap::kA8_Config:
             ct = kAlpha_8_SkColorType;
             break;
         case SkBitmap::kIndex8_Config:
             ct = kIndex_8_SkColorType;
             break;
         case SkBitmap::kRGB_565_Config:
             ct = kRGB_565_SkColorType;
             break;
         case SkBitmap::kARGB_4444_Config:
             ct = kARGB_4444_SkColorType;
             break;
         case SkBitmap::kARGB_8888_Config:
             ct = kPMColor_SkColorType;
             break;
         case SkBitmap::kNo_Config:
         default:
             return false;
     }
     if (ctOut) {
         *ctOut = ct;
     }
     return true;
 }
 SkPixelRef* SkBitmap::setPixelRef(SkPixelRef* pr, int dx, int dy) {
 #ifdef SK_DEBUG
     if (pr) {
         SkImageInfo info;
         if (this->asImageInfo(&info)) {
             const SkImageInfo& prInfo = pr->info();
             SkASSERT(info.fWidth <= prInfo.fWidth);
             SkASSERT(info.fHeight <= prInfo.fHeight);
             SkASSERT(info.fColorType == prInfo.fColorType);
             switch (prInfo.fAlphaType) {
                 case kIgnore_SkAlphaType:
                     SkASSERT(fInfo.fAlphaType == kIgnore_SkAlphaType);
                     break;
                 case kOpaque_SkAlphaType:
                 case kPremul_SkAlphaType:
                     SkASSERT(info.fAlphaType == kOpaque_SkAlphaType ||
                              info.fAlphaType == kPremul_SkAlphaType);
                     break;
                 case kUnpremul_SkAlphaType:
                     SkASSERT(info.fAlphaType == kOpaque_SkAlphaType ||
                              info.fAlphaType == kUnpremul_SkAlphaType);
                     break;
             }
         }
     }
 #endif
     if (pr) {
         const SkImageInfo& info = pr->info();
         fPixelRefOrigin.set(SkPin32(dx, 0, info.fWidth),
                             SkPin32(dy, 0, info.fHeight));
     } else {
         // ignore dx,dy if there is no pixelref
         fPixelRefOrigin.setZero();
     }
     if (fPixelRef != pr) {
         if (fPixelRef != pr) {
             this->freePixels();
             SkASSERT(NULL == fPixelRef);
             SkSafeRef(pr);
             fPixelRef = pr;
         }
         this->updatePixelsFromRef();
     }
     SkDEBUGCODE(this->validate();)
     return pr;
 }
 void SkBitmap::lockPixels() const {
     if (NULL != fPixelRef && 0 == sk_atomic_inc(&fPixelLockCount)) {
         fPixelRef->lockPixels();
         this->updatePixelsFromRef();
     }
     SkDEBUGCODE(this->validate();)
 }
 void SkBitmap::unlockPixels() const {
     SkASSERT(NULL == fPixelRef || fPixelLockCount > 0);
     if (NULL != fPixelRef && 1 == sk_atomic_dec(&fPixelLockCount)) {
         fPixelRef->unlockPixels();
         this->updatePixelsFromRef();
     }
     SkDEBUGCODE(this->validate();)
 }
 bool SkBitmap::lockPixelsAreWritable() const {
     return (fPixelRef) ? fPixelRef->lockPixelsAreWritable() : false;
 }
 void SkBitmap::setPixels(void* p, SkColorTable* ctable) {
     if (NULL == p) {
         this->setPixelRef(NULL);
         return;
     }
     SkImageInfo info;
     if (!this->asImageInfo(&info)) {
         this->setPixelRef(NULL);
         return;
     }
     SkPixelRef* pr = SkMallocPixelRef::NewDirect(info, p, fRowBytes, ctable);
     if (NULL == pr) {
         this->setPixelRef(NULL);
         return;
     }
     this->setPixelRef(pr)->unref();
     // since we're already allocated, we lockPixels right away
     this->lockPixels();
     SkDEBUGCODE(this->validate();)
 }
 bool SkBitmap::allocPixels(Allocator* allocator, SkColorTable* ctable) {
     HeapAllocator stdalloc;
     if (NULL == allocator) {
         allocator = &stdalloc;
     }
     return allocator->allocPixelRef(this, ctable);
 }
 ///////////////////////////////////////////////////////////////////////////////
 bool SkBitmap::allocPixels(const SkImageInfo& info, SkPixelRefFactory* factory,
                            SkColorTable* ctable) {
     if (kIndex_8_SkColorType == info.fColorType && NULL == ctable) {
         return reset_return_false(this);
     }
     if (!this->setConfig(info)) {
         return reset_return_false(this);
     }
     SkMallocPixelRef::PRFactory defaultFactory;
     if (NULL == factory) {
         factory = &defaultFactory;
     }
     SkPixelRef* pr = factory->create(info, ctable);
     if (NULL == pr) {
         return reset_return_false(this);
     }
     this->setPixelRef(pr)->unref();
     // TODO: lockPixels could/should return bool or void*/NULL
     this->lockPixels();
     if (NULL == this->getPixels()) {
         return reset_return_false(this);
     }
     return true;
 }
 bool SkBitmap::installPixels(const SkImageInfo& info, void* pixels, size_t rb,
                              void (*releaseProc)(void* addr, void* context),
                              void* context) {
     if (!this->setConfig(info, rb)) {
         this->reset();
         return false;
     }
     SkPixelRef* pr = SkMallocPixelRef::NewWithProc(info, rb, NULL, pixels,
                                                    releaseProc, context);
     if (!pr) {
         this->reset();
         return false;
     }
     this->setPixelRef(pr)->unref();
     // since we're already allocated, we lockPixels right away
     this->lockPixels();
     SkDEBUGCODE(this->validate();)
     return true;
 }
 bool SkBitmap::installMaskPixels(const SkMask& mask) {
     if (SkMask::kA8_Format != mask.fFormat) {
         this->reset();
         return false;
     }
     return this->installPixels(SkImageInfo::MakeA8(mask.fBounds.width(),
                                                    mask.fBounds.height()),
                                mask.fImage, mask.fRowBytes);
 }
 bool SkBitmap::allocConfigPixels(Config config, int width, int height,
                                  bool isOpaque) {
     SkColorType ct;
     if (!config_to_colorType(config, &ct)) {
         return false;
     }
     SkAlphaType at = isOpaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
     return this->allocPixels(SkImageInfo::Make(width, height, ct, at));
 }
 ///////////////////////////////////////////////////////////////////////////////
 void SkBitmap::freePixels() {
     // if we're gonna free the pixels, we certainly need to free the mipmap
     this->freeMipMap();
     if (NULL != fPixelRef) {
         if (fPixelLockCount > 0) {
             fPixelRef->unlockPixels();
         }
         fPixelRef->unref();
         fPixelRef = NULL;
         fPixelRefOrigin.setZero();
     }
     fPixelLockCount = 0;
     fPixels = NULL;
     fColorTable = NULL;
 }
 void SkBitmap::freeMipMap() {
     if (fMipMap) {
         fMipMap->unref();
         fMipMap = NULL;
     }
 }
 uint32_t SkBitmap::getGenerationID() const {
     return (fPixelRef) ? fPixelRef->getGenerationID() : 0;
 }
 void SkBitmap::notifyPixelsChanged() const {
     SkASSERT(!this->isImmutable());
     if (fPixelRef) {
         fPixelRef->notifyPixelsChanged();
     }
 }
 GrTexture* SkBitmap::getTexture() const {
     return fPixelRef ? fPixelRef->getTexture() : NULL;
 }
 ///////////////////////////////////////////////////////////////////////////////
 /** We explicitly use the same allocator for our pixels that SkMask does,
  so that we can freely assign memory allocated by one class to the other.
  */
 bool SkBitmap::HeapAllocator::allocPixelRef(SkBitmap* dst,
                                             SkColorTable* ctable) {
     SkImageInfo info;
     if (!dst->asImageInfo(&info)) {
 //        SkDebugf("unsupported config for info %d\n", dst->config());
         return false;
     }
     SkPixelRef* pr = SkMallocPixelRef::NewAllocate(info, dst->rowBytes(),
                                                    ctable);
     if (NULL == pr) {
         return false;
     }
     dst->setPixelRef(pr)->unref();
     // since we're already allocated, we lockPixels right away
     dst->lockPixels();
     return true;
 }
 ///////////////////////////////////////////////////////////////////////////////
 bool SkBitmap::copyPixelsTo(void* const dst, size_t dstSize,
                             size_t dstRowBytes, bool preserveDstPad) const {
     if (0 == dstRowBytes) {
         dstRowBytes = fRowBytes;
     }
     if (dstRowBytes < fInfo.minRowBytes() ||
         dst == NULL || (getPixels() == NULL && pixelRef() == NULL)) {
         return false;
     }
     if (!preserveDstPad && static_cast<uint32_t>(dstRowBytes) == fRowBytes) {
         size_t safeSize = this->getSafeSize();
         if (safeSize > dstSize || safeSize == 0)
             return false;
         else {
             SkAutoLockPixels lock(*this);
             // This implementation will write bytes beyond the end of each row,
             // excluding the last row, if the bitmap's stride is greater than
             // strictly required by the current config.
             memcpy(dst, getPixels(), safeSize);
             return true;
         }
     } else {
         // If destination has different stride than us, then copy line by line.
         if (fInfo.getSafeSize(dstRowBytes) > dstSize) {
             return false;
         } else {
             // Just copy what we need on each line.
             size_t rowBytes = fInfo.minRowBytes();
             SkAutoLockPixels lock(*this);
             const uint8_t* srcP = reinterpret_cast<const uint8_t*>(getPixels());
             uint8_t* dstP = reinterpret_cast<uint8_t*>(dst);
             for (int row = 0; row < fInfo.fHeight;
                  row++, srcP += fRowBytes, dstP += dstRowBytes) {
                 memcpy(dstP, srcP, rowBytes);
             }
             return true;
         }
     }
 }
 ///////////////////////////////////////////////////////////////////////////////
 bool SkBitmap::isImmutable() const {
     return fPixelRef ? fPixelRef->isImmutable() :
         fFlags & kImageIsImmutable_Flag;
 }
 void SkBitmap::setImmutable() {
     if (fPixelRef) {
         fPixelRef->setImmutable();
     } else {
         fFlags |= kImageIsImmutable_Flag;
     }
 }
 bool SkBitmap::isVolatile() const {
     return (fFlags & kImageIsVolatile_Flag) != 0;
 }
 void SkBitmap::setIsVolatile(bool isVolatile) {
     if (isVolatile) {
         fFlags |= kImageIsVolatile_Flag;
     } else {
         fFlags &= ~kImageIsVolatile_Flag;
     }
 }
 void* SkBitmap::getAddr(int x, int y) const {
     SkASSERT((unsigned)x < (unsigned)this->width());
     SkASSERT((unsigned)y < (unsigned)this->height());
     char* base = (char*)this->getPixels();
     if (base) {
         base += y * this->rowBytes();
         switch (this->colorType()) {
             case kRGBA_8888_SkColorType:
             case kBGRA_8888_SkColorType:
                 base += x << 2;
                 break;
             case kARGB_4444_SkColorType:
             case kRGB_565_SkColorType:
                 base += x << 1;
                 break;
             case kAlpha_8_SkColorType:
             case kIndex_8_SkColorType:
                 base += x;
                 break;
             default:
                 SkDEBUGFAIL("Can't return addr for config");
                 base = NULL;
                 break;
         }
     }
     return base;
 }
 SkColor SkBitmap::getColor(int x, int y) const {
     SkASSERT((unsigned)x < (unsigned)this->width());
     SkASSERT((unsigned)y < (unsigned)this->height());
     switch (this->config()) {
         case SkBitmap::kA8_Config: {
             uint8_t* addr = this->getAddr8(x, y);
             return SkColorSetA(0, addr[0]);
         }
         case SkBitmap::kIndex8_Config: {
             SkPMColor c = this->getIndex8Color(x, y);
             return SkUnPreMultiply::PMColorToColor(c);
         }
         case SkBitmap::kRGB_565_Config: {
             uint16_t* addr = this->getAddr16(x, y);
             return SkPixel16ToColor(addr[0]);
         }
         case SkBitmap::kARGB_4444_Config: {
             uint16_t* addr = this->getAddr16(x, y);
             SkPMColor c = SkPixel4444ToPixel32(addr[0]);
             return SkUnPreMultiply::PMColorToColor(c);
         }
         case SkBitmap::kARGB_8888_Config: {
             uint32_t* addr = this->getAddr32(x, y);
             return SkUnPreMultiply::PMColorToColor(addr[0]);
         }
         case kNo_Config:
         default:
             SkASSERT(false);
             return 0;
     }
     SkASSERT(false);  // Not reached.
     return 0;
 }
 bool SkBitmap::ComputeIsOpaque(const SkBitmap& bm) {
     SkAutoLockPixels alp(bm);
     if (!bm.getPixels()) {
         return false;
     }
     const int height = bm.height();
     const int width = bm.width();
     switch (bm.config()) {
         case SkBitmap::kA8_Config: {
             unsigned a = 0xFF;
             for (int y = 0; y < height; ++y) {
                 const uint8_t* row = bm.getAddr8(0, y);
                 for (int x = 0; x < width; ++x) {
                     a &= row[x];
                 }
                 if (0xFF != a) {
                     return false;
                 }
             }
             return true;
         } break;
         case SkBitmap::kIndex8_Config: {
             SkAutoLockColors alc(bm);
             const SkPMColor* table = alc.colors();
             if (!table) {
                 return false;
             }
             SkPMColor c = (SkPMColor)~0;
             for (int i = bm.getColorTable()->count() - 1; i >= 0; --i) {
                 c &= table[i];
             }
             return 0xFF == SkGetPackedA32(c);
         } break;
         case SkBitmap::kRGB_565_Config:
             return true;
             break;
         case SkBitmap::kARGB_4444_Config: {
             unsigned c = 0xFFFF;
             for (int y = 0; y < height; ++y) {
                 const SkPMColor16* row = bm.getAddr16(0, y);
                 for (int x = 0; x < width; ++x) {
                     c &= row[x];
                 }
                 if (0xF != SkGetPackedA4444(c)) {
                     return false;
                 }
             }
             return true;
         } break;
         case SkBitmap::kARGB_8888_Config: {
             SkPMColor c = (SkPMColor)~0;
             for (int y = 0; y < height; ++y) {
                 const SkPMColor* row = bm.getAddr32(0, y);
                 for (int x = 0; x < width; ++x) {
                     c &= row[x];
                 }
                 if (0xFF != SkGetPackedA32(c)) {
                     return false;
                 }
             }
             return true;
         }
         default:
             break;
     }
     return false;
 }
 ///////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////
 static uint16_t pack_8888_to_4444(unsigned a, unsigned r, unsigned g, unsigned b) {
     unsigned pixel = (SkA32To4444(a) << SK_A4444_SHIFT) |
                      (SkR32To4444(r) << SK_R4444_SHIFT) |
                      (SkG32To4444(g) << SK_G4444_SHIFT) |
                      (SkB32To4444(b) << SK_B4444_SHIFT);
     return SkToU16(pixel);
 }
 void SkBitmap::internalErase(const SkIRect& area,
                              U8CPU a, U8CPU r, U8CPU g, U8CPU b) const {
 #ifdef SK_DEBUG
     SkDEBUGCODE(this->validate();)
     SkASSERT(!area.isEmpty());
     {
         SkIRect total = { 0, 0, this->width(), this->height() };
         SkASSERT(total.contains(area));
     }
 #endif
     switch (fInfo.colorType()) {
         case kUnknown_SkColorType:
         case kIndex_8_SkColorType:
             return; // can't erase
         default:
             break;
     }
     SkAutoLockPixels alp(*this);
     // perform this check after the lock call
     if (!this->readyToDraw()) {
         return;
     }
     int height = area.height();
     const int width = area.width();
     const int rowBytes = fRowBytes;
     // make rgb premultiplied
     if (255 != a) {
         r = SkAlphaMul(r, a);
         g = SkAlphaMul(g, a);
         b = SkAlphaMul(b, a);
     }
     switch (this->colorType()) {
         case kAlpha_8_SkColorType: {
             uint8_t* p = this->getAddr8(area.fLeft, area.fTop);
             while (--height >= 0) {
                 memset(p, a, width);
                 p += rowBytes;
             }
             break;
         }
         case kARGB_4444_SkColorType:
         case kRGB_565_SkColorType: {
             uint16_t* p = this->getAddr16(area.fLeft, area.fTop);;
             uint16_t v;
             if (kARGB_4444_SkColorType == this->colorType()) {
                 v = pack_8888_to_4444(a, r, g, b);
             } else {
                 v = SkPackRGB16(r >> (8 - SK_R16_BITS),
                                 g >> (8 - SK_G16_BITS),
                                 b >> (8 - SK_B16_BITS));
             }
             while (--height >= 0) {
                 sk_memset16(p, v, width);
                 p = (uint16_t*)((char*)p + rowBytes);
             }
             break;
         }
         case kPMColor_SkColorType: {
             // what to do about BGRA or RGBA (which ever is != PMColor ?
             // for now we don't support them.
             uint32_t* p = this->getAddr32(area.fLeft, area.fTop);
             uint32_t  v = SkPackARGB32(a, r, g, b);
             while (--height >= 0) {
                 sk_memset32(p, v, width);
                 p = (uint32_t*)((char*)p + rowBytes);
             }
             break;
         }
         default:
             return; // no change, so don't call notifyPixelsChanged()
     }
     this->notifyPixelsChanged();
 }
 void SkBitmap::eraseARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b) const {
     SkIRect area = { 0, 0, this->width(), this->height() };
     if (!area.isEmpty()) {
         this->internalErase(area, a, r, g, b);
     }
 }
 void SkBitmap::eraseArea(const SkIRect& rect, SkColor c) const {
     SkIRect area = { 0, 0, this->width(), this->height() };
     if (area.intersect(rect)) {
         this->internalErase(area, SkColorGetA(c), SkColorGetR(c),
                             SkColorGetG(c), SkColorGetB(c));
     }
 }
 //////////////////////////////////////////////////////////////////////////////////////
 //////////////////////////////////////////////////////////////////////////////////////
 bool SkBitmap::extractSubset(SkBitmap* result, const SkIRect& subset) const {
     SkDEBUGCODE(this->validate();)
     if (NULL == result || NULL == fPixelRef) {
         return false;   // no src pixels
     }
     SkIRect srcRect, r;
     srcRect.set(0, 0, this->width(), this->height());
     if (!r.intersect(srcRect, subset)) {
         return false;   // r is empty (i.e. no intersection)
     }
     if (fPixelRef->getTexture() != NULL) {
         // Do a deep copy
         SkPixelRef* pixelRef = fPixelRef->deepCopy(this->config(), &subset);
         if (pixelRef != NULL) {
             SkBitmap dst;
             dst.setConfig(this->config(), subset.width(), subset.height(), 0,
                           this->alphaType());
             dst.setIsVolatile(this->isVolatile());
             dst.setPixelRef(pixelRef)->unref();
             SkDEBUGCODE(dst.validate());
             result->swap(dst);
             return true;
         }
     }
     // If the upper left of the rectangle was outside the bounds of this SkBitmap, we should have
     // exited above.
     SkASSERT(static_cast<unsigned>(r.fLeft) < static_cast<unsigned>(this->width()));
     SkASSERT(static_cast<unsigned>(r.fTop) < static_cast<unsigned>(this->height()));
     SkBitmap dst;
     dst.setConfig(this->config(), r.width(), r.height(), this->rowBytes(),
                   this->alphaType());
     dst.setIsVolatile(this->isVolatile());
     if (fPixelRef) {
         SkIPoint origin = fPixelRefOrigin;
         origin.fX += r.fLeft;
         origin.fY += r.fTop;
         // share the pixelref with a custom offset
         dst.setPixelRef(fPixelRef, origin);
     }
     SkDEBUGCODE(dst.validate();)
     // we know we're good, so commit to result
     result->swap(dst);
     return true;
 }
 ///////////////////////////////////////////////////////////////////////////////
 #include "SkCanvas.h"
 #include "SkPaint.h"
 bool SkBitmap::canCopyTo(SkColorType dstColorType) const {
     if (this->colorType() == kUnknown_SkColorType) {
         return false;
     }
     bool sameConfigs = (this->colorType() == dstColorType);
     switch (dstColorType) {
         case kAlpha_8_SkColorType:
         case kRGB_565_SkColorType:
         case kPMColor_SkColorType:
             break;
         case kIndex_8_SkColorType:
             if (!sameConfigs) {
                 return false;
             }
             break;
         case kARGB_4444_SkColorType:
             return sameConfigs || kPMColor_SkColorType == this->colorType();
         default:
             return false;
     }
     return true;
 }
 bool SkBitmap::copyTo(SkBitmap* dst, SkColorType dstColorType,
                       Allocator* alloc) const {
     if (!this->canCopyTo(dstColorType)) {
         return false;
     }
     // if we have a texture, first get those pixels
     SkBitmap tmpSrc;
     const SkBitmap* src = this;
     if (fPixelRef) {
         SkIRect subset;
         subset.setXYWH(fPixelRefOrigin.fX, fPixelRefOrigin.fY,
                        fInfo.width(), fInfo.height());
         if (fPixelRef->readPixels(&tmpSrc, &subset)) {
             SkASSERT(tmpSrc.width() == this->width());
             SkASSERT(tmpSrc.height() == this->height());
             // did we get lucky and we can just return tmpSrc?
             if (tmpSrc.colorType() == dstColorType && NULL == alloc) {
                 dst->swap(tmpSrc);
                 // If the result is an exact copy, clone the gen ID.
                 if (dst->pixelRef() && dst->pixelRef()->info() == fPixelRef->info()) {
                     dst->pixelRef()->cloneGenID(*fPixelRef);
                 }
                 return true;
             }
             // fall through to the raster case
             src = &tmpSrc;
         }
     }
     // we lock this now, since we may need its colortable
     SkAutoLockPixels srclock(*src);
     if (!src->readyToDraw()) {
         return false;
     }
     // The only way to be readyToDraw is if fPixelRef is non NULL.
     SkASSERT(fPixelRef != NULL);
     SkImageInfo dstInfo = src->info();
     dstInfo.fColorType = dstColorType;
     SkBitmap tmpDst;
     if (!tmpDst.setConfig(dstInfo)) {
         return false;
     }
     // allocate colortable if srcConfig == kIndex8_Config
     SkAutoTUnref<SkColorTable> ctable;
     if (dstColorType == kIndex_8_SkColorType) {
         // TODO: can we just ref() the src colortable? Is it reentrant-safe?
         ctable.reset(SkNEW_ARGS(SkColorTable, (*src->getColorTable())));
     }
     if (!tmpDst.allocPixels(alloc, ctable)) {
         return false;
     }
     if (!tmpDst.readyToDraw()) {
         // allocator/lock failed
         return false;
     }
     // pixelRef must be non NULL or tmpDst.readyToDraw() would have
     // returned false.
     SkASSERT(tmpDst.pixelRef() != NULL);
     /* do memcpy for the same configs cases, else use drawing
     */
     if (src->colorType() == dstColorType) {
         if (tmpDst.getSize() == src->getSize()) {
             memcpy(tmpDst.getPixels(), src->getPixels(), src->getSafeSize());
             SkPixelRef* pixelRef = tmpDst.pixelRef();
             // In order to reach this point, we know that the width, config and
             // rowbytes of the SkPixelRefs are the same, but it is possible for
             // the heights to differ, if this SkBitmap's height is a subset of
             // fPixelRef. Only if the SkPixelRefs' heights match are we
             // guaranteed that this is an exact copy, meaning we should clone
             // the genID.
             if (pixelRef->info().fHeight == fPixelRef->info().fHeight) {
                 // TODO: what to do if the two infos match, BUT
                 // fPixelRef is premul and pixelRef is opaque?
                 // skipping assert for now
                 // https://code.google.com/p/skia/issues/detail?id=2012
 //                SkASSERT(pixelRef->info() == fPixelRef->info());
                 SkASSERT(pixelRef->info().fWidth == fPixelRef->info().fWidth);
                 SkASSERT(pixelRef->info().fColorType == fPixelRef->info().fColorType);
                 pixelRef->cloneGenID(*fPixelRef);
             }
         } else {
             const char* srcP = reinterpret_cast<const char*>(src->getPixels());
             char* dstP = reinterpret_cast<char*>(tmpDst.getPixels());
             // to be sure we don't read too much, only copy our logical pixels
             size_t bytesToCopy = tmpDst.width() * tmpDst.bytesPerPixel();
             for (int y = 0; y < tmpDst.height(); y++) {
                 memcpy(dstP, srcP, bytesToCopy);
                 srcP += src->rowBytes();
                 dstP += tmpDst.rowBytes();
             }
         }
     } else if (kARGB_4444_SkColorType == dstColorType
                && kPMColor_SkColorType == src->colorType()) {
         SkASSERT(src->height() == tmpDst.height());
         SkASSERT(src->width() == tmpDst.width());
         for (int y = 0; y < src->height(); ++y) {
             SkPMColor16* SK_RESTRICT dstRow = (SkPMColor16*) tmpDst.getAddr16(0, y);
             SkPMColor* SK_RESTRICT srcRow = (SkPMColor*) src->getAddr32(0, y);
             DITHER_4444_SCAN(y);
             for (int x = 0; x < src->width(); ++x) {
                 dstRow[x] = SkDitherARGB32To4444(srcRow[x],
                                                  DITHER_VALUE(x));
             }
         }
     } else {
         // Always clear the dest in case one of the blitters accesses it
         // TODO: switch the allocation of tmpDst to call sk_calloc_throw
         tmpDst.eraseColor(SK_ColorTRANSPARENT);
         SkCanvas canvas(tmpDst);
         SkPaint  paint;
         paint.setDither(true);
         canvas.drawBitmap(*src, 0, 0, &paint);
     }
     dst->swap(tmpDst);
     return true;
 }
 bool SkBitmap::deepCopyTo(SkBitmap* dst) const {
     const SkBitmap::Config dstConfig = this->config();
     const SkColorType dstCT = SkBitmapConfigToColorType(dstConfig);
     if (!this->canCopyTo(dstCT)) {
         return false;
     }
     // If we have a PixelRef, and it supports deep copy, use it.
     // Currently supported only by texture-backed bitmaps.
     if (fPixelRef) {
         SkPixelRef* pixelRef = fPixelRef->deepCopy(dstConfig);
         if (pixelRef) {
             uint32_t rowBytes;
             if (this->colorType() == dstCT) {
                 // Since there is no subset to pass to deepCopy, and deepCopy
                 // succeeded, the new pixel ref must be identical.
                 SkASSERT(fPixelRef->info() == pixelRef->info());
                 pixelRef->cloneGenID(*fPixelRef);
                 // Use the same rowBytes as the original.
                 rowBytes = fRowBytes;
             } else {
                 // With the new config, an appropriate fRowBytes will be computed by setConfig.
                 rowBytes = 0;
             }
             SkImageInfo info = fInfo;
             info.fColorType = dstCT;
             if (!dst->setConfig(info, rowBytes)) {
                 return false;
             }
             dst->setPixelRef(pixelRef, fPixelRefOrigin)->unref();
             return true;
         }
     }
     if (this->getTexture()) {
         return false;
     } else {
         return this->copyTo(dst, dstCT, NULL);
     }
 }
 ///////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////
 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);
 }
 void SkBitmap::buildMipMap(bool forceRebuild) {
     if (forceRebuild)
         this->freeMipMap();
     else if (fMipMap)
         return; // we're already built
     SkASSERT(NULL == fMipMap);
     void (*proc)(SkBitmap* dst, int x, int y, const SkBitmap& src);
     const SkBitmap::Config config = this->config();
     switch (config) {
         case kARGB_8888_Config:
             proc = downsampleby2_proc32;
             break;
         case kRGB_565_Config:
             proc = downsampleby2_proc16;
             break;
         case kARGB_4444_Config:
             proc = downsampleby2_proc4444;
             break;
         case kIndex8_Config:
         case kA8_Config:
         default:
             return; // don't build mipmaps for these configs
     }
     SkAutoLockPixels alp(*this);
     if (!this->readyToDraw()) {
         return;
     }
     // whip through our loop to compute the exact size needed
     size_t  size = 0;
     int     maxLevels = 0;
     {
         int width = this->width();
         int height = this->height();
         for (;;) {
             width >>= 1;
             height >>= 1;
             if (0 == width || 0 == height) {
                 break;
             }
             size += ComputeRowBytes(config, width) * height;
             maxLevels += 1;
         }
     }
     // nothing to build
     if (0 == maxLevels) {
         return;
     }
     SkBitmap srcBM(*this);
     srcBM.lockPixels();
     if (!srcBM.readyToDraw()) {
         return;
     }
     MipMap* mm = MipMap::Alloc(maxLevels, size);
     if (NULL == mm) {
         return;
     }
     MipLevel*   level = mm->levels();
     uint8_t*    addr = (uint8_t*)mm->pixels();
     int         width = this->width();
     int         height = this->height();
     uint32_t    rowBytes;
     SkBitmap    dstBM;
     for (int i = 0; i < maxLevels; i++) {
         width >>= 1;
         height >>= 1;
         rowBytes = SkToU32(ComputeRowBytes(config, width));
         level[i].fPixels   = addr;
         level[i].fWidth    = width;
         level[i].fHeight   = height;
         level[i].fRowBytes = rowBytes;
         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 == (uint8_t*)mm->pixels() + size);
     fMipMap = mm;
 }
 bool SkBitmap::hasMipMap() const {
     return fMipMap != NULL;
 }
 int SkBitmap::extractMipLevel(SkBitmap* dst, SkFixed sx, SkFixed sy) {
     if (NULL == fMipMap) {
         return 0;
     }
     int level = ComputeMipLevel(sx, sy) >> 16;
     SkASSERT(level >= 0);
     if (level <= 0) {
         return 0;
     }
     if (level >= fMipMap->fLevelCount) {
         level = fMipMap->fLevelCount - 1;
     }
     if (dst) {
         const MipLevel& mip = fMipMap->levels()[level - 1];
         dst->setConfig((SkBitmap::Config)this->config(),
                        mip.fWidth, mip.fHeight, mip.fRowBytes);
         dst->setPixels(mip.fPixels);
     }
     return level;
 }
 SkFixed SkBitmap::ComputeMipLevel(SkFixed sx, SkFixed sy) {
     sx = SkAbs32(sx);
     sy = SkAbs32(sy);
     if (sx < sy) {
         sx = sy;
     }
     if (sx < SK_Fixed1) {
         return 0;
     }
     int clz = SkCLZ(sx);
     SkASSERT(clz >= 1 && clz <= 15);
     return SkIntToFixed(15 - clz) + ((unsigned)(sx << (clz + 1)) >> 16);
 }
 ///////////////////////////////////////////////////////////////////////////////
 static bool GetBitmapAlpha(const SkBitmap& src, uint8_t* SK_RESTRICT alpha,
                            int alphaRowBytes) {
     SkASSERT(alpha != NULL);
     SkASSERT(alphaRowBytes >= src.width());
     SkBitmap::Config config = src.config();
     int              w = src.width();
     int              h = src.height();
     size_t           rb = src.rowBytes();
     SkAutoLockPixels alp(src);
     if (!src.readyToDraw()) {
         // zero out the alpha buffer and return
         while (--h >= 0) {
             memset(alpha, 0, w);
             alpha += alphaRowBytes;
         }
         return false;
     }
     if (SkBitmap::kA8_Config == config && !src.isOpaque()) {
         const uint8_t* s = src.getAddr8(0, 0);
         while (--h >= 0) {
             memcpy(alpha, s, w);
             s += rb;
             alpha += alphaRowBytes;
         }
     } else if (SkBitmap::kARGB_8888_Config == config && !src.isOpaque()) {
         const SkPMColor* SK_RESTRICT s = src.getAddr32(0, 0);
         while (--h >= 0) {
             for (int x = 0; x < w; x++) {
                 alpha[x] = SkGetPackedA32(s[x]);
             }
             s = (const SkPMColor*)((const char*)s + rb);
             alpha += alphaRowBytes;
         }
     } else if (SkBitmap::kARGB_4444_Config == config && !src.isOpaque()) {
         const SkPMColor16* SK_RESTRICT s = src.getAddr16(0, 0);
         while (--h >= 0) {
             for (int x = 0; x < w; x++) {
                 alpha[x] = SkPacked4444ToA32(s[x]);
             }
             s = (const SkPMColor16*)((const char*)s + rb);
             alpha += alphaRowBytes;
         }
     } else if (SkBitmap::kIndex8_Config == config && !src.isOpaque()) {
         SkColorTable* ct = src.getColorTable();
         if (ct) {
             const SkPMColor* SK_RESTRICT table = ct->lockColors();
             const uint8_t* SK_RESTRICT s = src.getAddr8(0, 0);
             while (--h >= 0) {
                 for (int x = 0; x < w; x++) {
                     alpha[x] = SkGetPackedA32(table[s[x]]);
                 }
                 s += rb;
                 alpha += alphaRowBytes;
             }
             ct->unlockColors();
         }
     } else {    // src is opaque, so just fill alpha[] with 0xFF
         memset(alpha, 0xFF, h * alphaRowBytes);
     }
     return true;
 }
 #include "SkPaint.h"
 #include "SkMaskFilter.h"
 #include "SkMatrix.h"
 bool SkBitmap::extractAlpha(SkBitmap* dst, const SkPaint* paint,
                             Allocator *allocator, SkIPoint* offset) const {
     SkDEBUGCODE(this->validate();)
     SkBitmap    tmpBitmap;
     SkMatrix    identity;
     SkMask      srcM, dstM;
     srcM.fBounds.set(0, 0, this->width(), this->height());
     srcM.fRowBytes = SkAlign4(this->width());
     srcM.fFormat = SkMask::kA8_Format;
     SkMaskFilter* filter = paint ? paint->getMaskFilter() : NULL;
     // compute our (larger?) dst bounds if we have a filter
     if (NULL != filter) {
         identity.reset();
         srcM.fImage = NULL;
         if (!filter->filterMask(&dstM, srcM, identity, NULL)) {
             goto NO_FILTER_CASE;
         }
         dstM.fRowBytes = SkAlign4(dstM.fBounds.width());
     } else {
     NO_FILTER_CASE:
         tmpBitmap.setConfig(SkBitmap::kA8_Config, this->width(), this->height(),
                        srcM.fRowBytes);
         if (!tmpBitmap.allocPixels(allocator, NULL)) {
             // Allocation of pixels for alpha bitmap failed.
             SkDebugf("extractAlpha failed to allocate (%d,%d) alpha bitmap\n",
                     tmpBitmap.width(), tmpBitmap.height());
             return false;
         }
         GetBitmapAlpha(*this, tmpBitmap.getAddr8(0, 0), srcM.fRowBytes);
         if (offset) {
             offset->set(0, 0);
         }
         tmpBitmap.swap(*dst);
         return true;
     }
     srcM.fImage = SkMask::AllocImage(srcM.computeImageSize());
     SkAutoMaskFreeImage srcCleanup(srcM.fImage);
     GetBitmapAlpha(*this, srcM.fImage, srcM.fRowBytes);
     if (!filter->filterMask(&dstM, srcM, identity, NULL)) {
         goto NO_FILTER_CASE;
     }
     SkAutoMaskFreeImage dstCleanup(dstM.fImage);
     tmpBitmap.setConfig(SkBitmap::kA8_Config, dstM.fBounds.width(),
                    dstM.fBounds.height(), dstM.fRowBytes);
     if (!tmpBitmap.allocPixels(allocator, NULL)) {
         // Allocation of pixels for alpha bitmap failed.
         SkDebugf("extractAlpha failed to allocate (%d,%d) alpha bitmap\n",
                 tmpBitmap.width(), tmpBitmap.height());
         return false;
     }
     memcpy(tmpBitmap.getPixels(), dstM.fImage, dstM.computeImageSize());
     if (offset) {
         offset->set(dstM.fBounds.fLeft, dstM.fBounds.fTop);
     }
     SkDEBUGCODE(tmpBitmap.validate();)
     tmpBitmap.swap(*dst);
     return true;
 }
 ///////////////////////////////////////////////////////////////////////////////
 enum {
     SERIALIZE_PIXELTYPE_NONE,
     SERIALIZE_PIXELTYPE_REF_DATA
 };
 void SkBitmap::flatten(SkWriteBuffer& buffer) const {
     fInfo.flatten(buffer);
     buffer.writeInt(fRowBytes);
     if (fPixelRef) {
         if (fPixelRef->getFactory()) {
             buffer.writeInt(SERIALIZE_PIXELTYPE_REF_DATA);
             buffer.writeInt(fPixelRefOrigin.fX);
             buffer.writeInt(fPixelRefOrigin.fY);
             buffer.writeFlattenable(fPixelRef);
             return;
         }
         // if we get here, we can't record the pixels
         buffer.writeInt(SERIALIZE_PIXELTYPE_NONE);
     } else {
         buffer.writeInt(SERIALIZE_PIXELTYPE_NONE);
     }
 }
 void SkBitmap::unflatten(SkReadBuffer& buffer) {
     this->reset();
     SkImageInfo info;
     info.unflatten(buffer);
     size_t rowBytes = buffer.readInt();
     if (!buffer.validate((info.width() >= 0) && (info.height() >= 0) &&
                          SkColorTypeIsValid(info.fColorType) &&
                          SkAlphaTypeIsValid(info.fAlphaType) &&
                          validate_alphaType(info.fColorType, info.fAlphaType) &&
                          info.validRowBytes(rowBytes))) {
         return;
     }
     bool configIsValid = this->setConfig(info, rowBytes);
     buffer.validate(configIsValid);
     int reftype = buffer.readInt();
     if (buffer.validate((SERIALIZE_PIXELTYPE_REF_DATA == reftype) ||
                         (SERIALIZE_PIXELTYPE_NONE == reftype))) {
         switch (reftype) {
             case SERIALIZE_PIXELTYPE_REF_DATA: {
                 SkIPoint origin;
                 origin.fX = buffer.readInt();
                 origin.fY = buffer.readInt();
                 size_t offset = origin.fY * rowBytes + origin.fX * info.bytesPerPixel();
                 SkPixelRef* pr = buffer.readPixelRef();
                 if (!buffer.validate((NULL == pr) ||
                        (pr->getAllocatedSizeInBytes() >= (offset + this->getSafeSize())))) {
                     origin.setZero();
                 }
                 SkSafeUnref(this->setPixelRef(pr, origin));
                 break;
             }
             case SERIALIZE_PIXELTYPE_NONE:
                 break;
             default:
                 SkDEBUGFAIL("unrecognized pixeltype in serialized data");
                 sk_throw();
         }
     }
 }
 ///////////////////////////////////////////////////////////////////////////////
 SkBitmap::RLEPixels::RLEPixels(int width, int height) {
     fHeight = height;
     fYPtrs = (uint8_t**)sk_calloc_throw(height * sizeof(uint8_t*));
 }
 SkBitmap::RLEPixels::~RLEPixels() {
     sk_free(fYPtrs);
 }
 ///////////////////////////////////////////////////////////////////////////////
 #ifdef SK_DEBUG
 void SkBitmap::validate() const {
     fInfo.validate();
     // ImageInfo may not require this, but Bitmap ensures that opaque-only
     // colorTypes report opaque for their alphatype
     if (kRGB_565_SkColorType == fInfo.colorType()) {
         SkASSERT(kOpaque_SkAlphaType == fInfo.alphaType());
     }
     SkASSERT(fInfo.validRowBytes(fRowBytes));
     uint8_t allFlags = kImageIsOpaque_Flag | kImageIsVolatile_Flag | kImageIsImmutable_Flag;
 #ifdef SK_BUILD_FOR_ANDROID
     allFlags |= kHasHardwareMipMap_Flag;
 #endif
     SkASSERT(fFlags <= allFlags);
     SkASSERT(fPixelLockCount >= 0);
     if (fPixels) {
         SkASSERT(fPixelRef);
         SkASSERT(fPixelLockCount > 0);
         SkASSERT(fPixelRef->isLocked());
         SkASSERT(fPixelRef->rowBytes() == fRowBytes);
         SkASSERT(fPixelRefOrigin.fX >= 0);
         SkASSERT(fPixelRefOrigin.fY >= 0);
         SkASSERT(fPixelRef->info().width() >= (int)this->width() + fPixelRefOrigin.fX);
         SkASSERT(fPixelRef->info().fHeight >= (int)this->height() + fPixelRefOrigin.fY);
         SkASSERT(fPixelRef->rowBytes() >= fInfo.minRowBytes());
     } else {
         SkASSERT(NULL == fColorTable);
     }
 }
 #endif
 #ifndef SK_IGNORE_TO_STRING
 void SkBitmap::toString(SkString* str) const {
     static const char* gConfigNames[kConfigCount] = {
         "NONE", "A8", "INDEX8", "565", "4444", "8888"
     };
     str->appendf("bitmap: ((%d, %d) %s", this->width(), this->height(),
                  gConfigNames[this->config()]);
     str->append(" (");
     if (this->isOpaque()) {
         str->append("opaque");
     } else {
         str->append("transparent");
     }
     if (this->isImmutable()) {
         str->append(", immutable");
     } else {
         str->append(", not-immutable");
     }
     str->append(")");
     SkPixelRef* pr = this->pixelRef();
     if (NULL == pr) {
         // show null or the explicit pixel address (rare)
         str->appendf(" pixels:%p", this->getPixels());
     } else {
         const char* uri = pr->getURI();
         if (NULL != uri) {
             str->appendf(" uri:\"%s\"", uri);
         } else {
             str->appendf(" pixelref:%p", pr);
         }
     }
     str->append(")");
 }
 #endif
 ///////////////////////////////////////////////////////////////////////////////
 #ifdef SK_DEBUG
 void SkImageInfo::validate() const {
     SkASSERT(fWidth >= 0);
     SkASSERT(fHeight >= 0);
     SkASSERT(SkColorTypeIsValid(fColorType));
     SkASSERT(SkAlphaTypeIsValid(fAlphaType));
 }
 #endif

The Tor Browser / annotate

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

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