Reapply "Remove Bitmaps Raw Pixel Support."

This CL reapplies r4722. Now that we have addressed the issues
in Chrome tests that were causing asserts to be fired.

Review URL: https://codereview.appspot.com/6452050

git-svn-id: http://skia.googlecode.com/svn/trunk@4804 2bbb7eff-a529-9590-31e7-b0007b416f81

5 files changed, 23 insertions, 77 deletions

diff --git a/include/core/SkBitmap.h b/include/core/SkBitmap.h
index 5673fb289f..9ddd702a1f 100644
--- a/include/core/SkBitmap.h
+++ b/include/core/SkBitmap.h
@@ -94,10 +94,10 @@ public:
     */
     bool empty() const { return 0 == fWidth || 0 == fHeight; }
 
-    /** Return true iff the bitmap has no pixels nor a pixelref. Note: this can
-        return true even if the dimensions of the bitmap are > 0 (see empty()).
+    /** Return true iff the bitmap has no pixelref. Note: this can return true even if the
+        dimensions of the bitmap are > 0 (see empty()).
     */
-    bool isNull() const { return NULL == fPixels && NULL == fPixelRef; }
+    bool isNull() const { return NULL == fPixelRef; }
 
     /** Return the config for the bitmap.
     */
@@ -361,9 +361,9 @@ public:
     SkColorTable* getColorTable() const { return fColorTable; }
 
     /** Returns a non-zero, unique value corresponding to the pixels in our
-        pixelref (or raw pixels set via setPixels). Each time the pixels are
-        changed (and notifyPixelsChanged is called), a different generation ID
-        will be returned.
+        pixelref. Each time the pixels are changed (and notifyPixelsChanged
+        is called), a different generation ID will be returned. Finally, if
+        their is no pixelRef then zero is returned.
     */
     uint32_t getGenerationID() const;
 
@@ -612,10 +612,6 @@ private:
     // or a cache of the returned value from fPixelRef->lockPixels()
     mutable void*       fPixels;
     mutable SkColorTable* fColorTable;    // only meaningful for kIndex8
-    // When there is no pixel ref (setPixels was called) we still need a
-    // gen id for SkDevice implementations that may cache a copy of the
-    // pixels (e.g. as a gpu texture)
-    mutable int         fRawPixelGenerationID;
 
     enum Flags {
         kImageIsOpaque_Flag     = 0x01,
diff --git a/include/core/SkMallocPixelRef.h b/include/core/SkMallocPixelRef.h
index 802e2b2e36..1bf1afc694 100644
--- a/include/core/SkMallocPixelRef.h
+++ b/include/core/SkMallocPixelRef.h
@@ -21,7 +21,7 @@ public:
         last owner of this pixelref is gone. If addr is NULL, sk_malloc_throw()
         is called to allocate it.
      */
-    SkMallocPixelRef(void* addr, size_t size, SkColorTable* ctable);
+    SkMallocPixelRef(void* addr, size_t size, SkColorTable* ctable, bool ownPixels = true);
     virtual ~SkMallocPixelRef();
     
     //! Return the allocation size for the pixels
@@ -42,6 +42,7 @@ private:
     void*           fStorage;
     size_t          fSize;
     SkColorTable*   fCTable;
+    bool            fOwnPixels;
 
     typedef SkPixelRef INHERITED;
 };
diff --git a/src/core/SkBitmap.cpp b/src/core/SkBitmap.cpp
index b1a4b7e374..687cf7a000 100644
--- a/src/core/SkBitmap.cpp
+++ b/src/core/SkBitmap.cpp
@@ -22,8 +22,6 @@
 
 SK_DEFINE_INST_COUNT(SkBitmap::Allocator)
 
-extern int32_t SkNextPixelRefGenerationID();
-
 static bool isPos32Bits(const Sk64& value) {
     return !value.isNeg() && value.is32();
 }
@@ -139,7 +137,6 @@ void SkBitmap::swap(SkBitmap& other) {
     SkTSwap(fPixelLockCount, other.fPixelLockCount);
     SkTSwap(fMipMap, other.fMipMap);
     SkTSwap(fPixels, other.fPixels);
-    SkTSwap(fRawPixelGenerationID, other.fRawPixelGenerationID);
     SkTSwap(fRowBytes, other.fRowBytes);
     SkTSwap(fWidth, other.fWidth);
     SkTSwap(fHeight, other.fHeight);
@@ -359,18 +356,16 @@ void SkBitmap::unlockPixels() const {
 }
 
 bool SkBitmap::lockPixelsAreWritable() const {
-    if (fPixelRef) {
-        return fPixelRef->lockPixelsAreWritable();
-    } else {
-        return fPixels != NULL;
-    }
+    return (fPixelRef) ? fPixelRef->lockPixelsAreWritable() : false;
 }
 
 void SkBitmap::setPixels(void* p, SkColorTable* ctable) {
-    this->freePixels();
-    fPixels = p;
-    SkRefCnt_SafeAssign(fColorTable, ctable);
+    Sk64 size = this->getSize64();
+    SkASSERT(!size.isNeg() && size.is32());
 
+    this->setPixelRef(new SkMallocPixelRef(p, size.get32(), ctable, false))->unref();
+    // since we're already allocated, we lockPixels right away
+    this->lockPixels();
     SkDEBUGCODE(this->validate();)
 }
 
@@ -412,23 +407,13 @@ void SkBitmap::freeMipMap() {
 }
 
 uint32_t SkBitmap::getGenerationID() const {
-    if (fPixelRef) {
-        return fPixelRef->getGenerationID();
-    } else {
-        SkASSERT(fPixels || !fRawPixelGenerationID);
-        if (fPixels && !fRawPixelGenerationID) {
-            fRawPixelGenerationID = SkNextPixelRefGenerationID();
-        }
-        return fRawPixelGenerationID;
-    }
+    return (fPixelRef) ? fPixelRef->getGenerationID() : 0;
 }
 
 void SkBitmap::notifyPixelsChanged() const {
     SkASSERT(!this->isImmutable());
     if (fPixelRef) {
         fPixelRef->notifyPixelsChanged();
-    } else {
-        fRawPixelGenerationID = 0; // will grab next ID in getGenerationID
     }
 }
 
@@ -791,7 +776,7 @@ static size_t getSubOffset(const SkBitmap& bm, int x, int y) {
 bool SkBitmap::extractSubset(SkBitmap* result, const SkIRect& subset) const {
     SkDEBUGCODE(this->validate();)
 
-    if (NULL == result || (NULL == fPixelRef && NULL == fPixels)) {
+    if (NULL == result || NULL == fPixelRef) {
         return false;   // no src pixels
     }
 
@@ -841,9 +826,6 @@ bool SkBitmap::extractSubset(SkBitmap* result, const SkIRect& subset) const {
     if (fPixelRef) {
         // share the pixelref with a custom offset
         dst.setPixelRef(fPixelRef, fPixelRefOffset + offset);
-    } else {
-        // share the pixels (owned by the caller)
-        dst.setPixels((char*)fPixels + offset, this->getColorTable());
     }
     SkDEBUGCODE(dst.validate();)
 
@@ -1376,8 +1358,6 @@ bool SkBitmap::extractAlpha(SkBitmap* dst, const SkPaint* paint,
 
 enum {
     SERIALIZE_PIXELTYPE_NONE,
-    SERIALIZE_PIXELTYPE_RAW_WITH_CTABLE,
-    SERIALIZE_PIXELTYPE_RAW_NO_CTABLE,
     SERIALIZE_PIXELTYPE_REF_DATA,
     SERIALIZE_PIXELTYPE_REF_PTR
 };
@@ -1429,21 +1409,6 @@ void SkBitmap::flatten(SkFlattenableWriteBuffer& buffer) const {
         }
         // if we get here, we can't record the pixels
         buffer.write8(SERIALIZE_PIXELTYPE_NONE);
-    } else if (fPixels) {
-        if (fColorTable) {
-            buffer.write8(SERIALIZE_PIXELTYPE_RAW_WITH_CTABLE);
-            buffer.writeFlattenable(fColorTable);
-        } else {
-            buffer.write8(SERIALIZE_PIXELTYPE_RAW_NO_CTABLE);
-        }
-        buffer.writePad(fPixels, this->getSafeSize());
-        // There is no writeZeroPad() fcn, so write individual bytes.
-        if (this->getSize() > this->getSafeSize()) {
-            size_t deltaSize = this->getSize() - this->getSafeSize();
-            // Need aligned pointer to write into due to internal implementa-
-            // tion of SkWriter32.
-            memset(buffer.reserve(SkAlign4(deltaSize)), 0, deltaSize);
-        }
     } else {
         buffer.write8(SERIALIZE_PIXELTYPE_NONE);
     }
@@ -1474,26 +1439,6 @@ void SkBitmap::unflatten(SkFlattenableReadBuffer& buffer) {
             SkSafeUnref(this->setPixelRef(pr, offset));
             break;
         }
-        case SERIALIZE_PIXELTYPE_RAW_WITH_CTABLE:
-        case SERIALIZE_PIXELTYPE_RAW_NO_CTABLE: {
-            SkColorTable* ctable = NULL;
-            if (SERIALIZE_PIXELTYPE_RAW_WITH_CTABLE == reftype) {
-                ctable = static_cast<SkColorTable*>(buffer.readFlattenable());
-            }
-            size_t size = this->getSize();
-            if (this->allocPixels(ctable)) {
-                this->lockPixels();
-                // Just read what we need.
-                buffer.read(this->getPixels(), this->getSafeSize());
-                // Keep aligned for subsequent reads.
-                buffer.skip(size - this->getSafeSize());
-                this->unlockPixels();
-            } else {
-                buffer.skip(size); // Still skip the full-sized buffer though.
-            }
-            SkSafeUnref(ctable);
-            break;
-        }
         case SERIALIZE_PIXELTYPE_NONE:
             break;
         default:
diff --git a/src/core/SkMallocPixelRef.cpp b/src/core/SkMallocPixelRef.cpp
index 4bcf1bd16d..f0bc0578d6 100644
--- a/src/core/SkMallocPixelRef.cpp
+++ b/src/core/SkMallocPixelRef.cpp
@@ -10,21 +10,25 @@
 #include "SkFlattenable.h"
 
 SkMallocPixelRef::SkMallocPixelRef(void* storage, size_t size,
-                                   SkColorTable* ctable) {
+                                   SkColorTable* ctable, bool ownPixels) {
     if (NULL == storage) {
+        SkASSERT(ownPixels);
         storage = sk_malloc_throw(size);
     }
     fStorage = storage;
     fSize = size;
     fCTable = ctable;
     SkSafeRef(ctable);
+    fOwnPixels = ownPixels;
     
     this->setPreLocked(fStorage, fCTable);
 }
 
 SkMallocPixelRef::~SkMallocPixelRef() {
     SkSafeUnref(fCTable);
-    sk_free(fStorage);
+    if (fOwnPixels) {
+        sk_free(fStorage);
+    }
 }
 
 void* SkMallocPixelRef::onLockPixels(SkColorTable** ct) {
@@ -59,6 +63,7 @@ SkMallocPixelRef::SkMallocPixelRef(SkFlattenableReadBuffer& buffer)
     } else {
         fCTable = NULL;
     }
+    fOwnPixels = true;
 
     this->setPreLocked(fStorage, fCTable);
 }
diff --git a/src/core/SkPixelRef.cpp b/src/core/SkPixelRef.cpp
index 96c991c0a7..a5ae6df1bd 100644
--- a/src/core/SkPixelRef.cpp
+++ b/src/core/SkPixelRef.cpp
@@ -34,7 +34,6 @@ static SkBaseMutex* get_default_mutex() {
 
 ///////////////////////////////////////////////////////////////////////////////
 
-extern int32_t SkNextPixelRefGenerationID();
 int32_t SkNextPixelRefGenerationID() {
     static int32_t  gPixelRefGenerationID;
     // do a loop in case our global wraps around, as we never want to