Make SkPixelRef::isLocked() debug-only, remove related dead code.

DM's okay locally with no diffs, no failures.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/8e65712486c66108677a9b0a55ad3e7ca94db555

Review URL: https://codereview.chromium.org/940083002

include/core/SkPixelRef.h

@@ -86,11 +86,7 @@ public:
         }
     };
 
-    /**
-     *  Returns true if the lockcount > 0
-     */
-    bool isLocked() const { return fLockCount > 0; }
-
+    SkDEBUGCODE(bool isLocked() const { return fLockCount > 0; })
     SkDEBUGCODE(int getLockCount() const { return fLockCount; })
 
     /**
@@ -197,37 +193,6 @@ public:
         return this->onRefEncodedData();
     }
 
-    /**
-     *  Experimental -- tells the caller if it is worth it to call decodeInto().
-     *  Just an optimization at this point, to avoid checking the cache first.
-     *  We may remove/change this call in the future.
-     */
-    bool implementsDecodeInto() {
-        return this->onImplementsDecodeInto();
-    }
-
-    /**
-     *  Return a decoded instance of this pixelRef in bitmap. If this cannot be
-     *  done, return false and the bitmap parameter is ignored/unchanged.
-     *
-     *  pow2 is the requeste power-of-two downscale that the caller needs. This
-     *  can be ignored, and the "original" size can be returned, but if the
-     *  underlying codec can efficiently return a smaller size, that should be
-     *  done. Some examples:
-     *
-     *  To request the "base" version (original scale), pass 0 for pow2
-     *  To request 1/2 scale version (1/2 width, 1/2 height), pass 1 for pow2
-     *  To request 1/4 scale version (1/4 width, 1/4 height), pass 2 for pow2
-     *  ...
-     *
-     *  If this returns true, then bitmap must be "locked" such that
-     *  bitmap->getPixels() will return the correct address.
-     */
-    bool decodeInto(int pow2, SkBitmap* bitmap) {
-        SkASSERT(pow2 >= 0);
-        return this->onDecodeInto(pow2, bitmap);
-    }
-
     /** Are we really wrapping a texture instead of a bitmap?
      */
     virtual GrTexture* getTexture() { return NULL; }
@@ -303,11 +268,6 @@ protected:
     /** Default impl returns true */
     virtual bool onLockPixelsAreWritable() const;
 
-    // returns false;
-    virtual bool onImplementsDecodeInto();
-    // returns false;
-    virtual bool onDecodeInto(int pow2, SkBitmap* bitmap);
-
     /**
      *  For pixelrefs that don't have access to their raw pixels, they may be
      *  able to make a copy of them (e.g. if the pixels are on the GPU).

src/core/SkBitmapProcState.cpp

@@ -241,43 +241,12 @@ void SkBitmapProcState::processMediumRequest() {
     }
 }
 
-static bool get_locked_pixels(const SkBitmap& src, int pow2, SkBitmap* dst) {
-    SkPixelRef* pr = src.pixelRef();
-    if (pr && pr->decodeInto(pow2, dst)) {
-        return true;
-    }
-
-    /*
-     *  If decodeInto() fails, it is possibe that we have an old subclass that
-     *  does not, or cannot, implement that. In that case we fall back to the
-     *  older protocol of having the pixelRef handle the caching for us.
-     */
-    *dst = src;
-    dst->lockPixels();
-    return SkToBool(dst->getPixels());
-}
-
 bool SkBitmapProcState::lockBaseBitmap() {
-    SkPixelRef* pr = fOrigBitmap.pixelRef();
-
-    if (pr->isLocked() || !pr->implementsDecodeInto()) {
-        // fast-case, no need to look in our cache
-        fScaledBitmap = fOrigBitmap;
-        fScaledBitmap.lockPixels();
-        if (NULL == fScaledBitmap.getPixels()) {
-            return false;
-        }
-    } else {
-        if (!SkBitmapCache::Find(fOrigBitmap, 1, 1, &fScaledBitmap)) {
-            if (!get_locked_pixels(fOrigBitmap, 0, &fScaledBitmap)) {
-                return false;
-            }
-
-            // TODO: if fScaled comes back at a different width/height than fOrig,
-            // we need to update the matrix we are using to sample from this guy.
-
-            SkBitmapCache::Add(fOrigBitmap, 1, 1, fScaledBitmap);
-        }
+    // TODO(reed): use bitmap cache here?
+    fScaledBitmap = fOrigBitmap;
+    fScaledBitmap.lockPixels();
+    if (NULL == fScaledBitmap.getPixels()) {
+        return false;
     }
     fBitmap = &fScaledBitmap;
     return true;
@@ -387,7 +356,7 @@ bool SkBitmapProcState::chooseProcs(const SkMatrix& inv, const SkPaint& paint) {
     fShaderProc16 = NULL;
     fSampleProc32 = NULL;
     fSampleProc16 = NULL;
-    
+
     // recompute the triviality of the matrix here because we may have
     // changed it!
 
@@ -561,10 +530,10 @@ bool SkBitmapProcState::chooseScanlineProcs(bool trivialMatrix, bool clampClamp,
             fShaderProc32 = this->chooseShaderProc32();
         }
     }
-    
+
     // see if our platform has any accelerated overrides
     this->platformProcs();
-    
+
     return true;
 }
 

src/core/SkPixelRef.cpp

@@ -197,14 +197,6 @@ bool SkPixelRef::onLockPixelsAreWritable() const {
     return true;
 }
 
-bool SkPixelRef::onImplementsDecodeInto() {
-    return false;
-}
-
-bool SkPixelRef::onDecodeInto(int pow2, SkBitmap* bitmap) {
-    return false;
-}
-
 uint32_t SkPixelRef::getGenerationID() const {
     if (0 == fGenerationID) {
         fGenerationID = SkNextPixelRefGenerationID();

src/lazy/SkDiscardablePixelRef.cpp

@@ -18,6 +18,7 @@ SkDiscardablePixelRef::SkDiscardablePixelRef(const SkImageInfo& info,
     , fDMFactory(fact)
     , fRowBytes(rowBytes)
     , fDiscardableMemory(NULL)
+    , fDiscardableMemoryIsLocked(false)
 {
     SkASSERT(fGenerator != NULL);
     SkASSERT(fRowBytes > 0);
@@ -28,8 +29,9 @@ SkDiscardablePixelRef::SkDiscardablePixelRef(const SkImageInfo& info,
 }
 
 SkDiscardablePixelRef::~SkDiscardablePixelRef() {
-    if (this->isLocked()) {
+    if (fDiscardableMemoryIsLocked) {
         fDiscardableMemory->unlock();
+        fDiscardableMemoryIsLocked = false;
     }
     SkDELETE(fDiscardableMemory);
     SkSafeUnref(fDMFactory);
@@ -39,6 +41,7 @@ SkDiscardablePixelRef::~SkDiscardablePixelRef() {
 bool SkDiscardablePixelRef::onNewLockPixels(LockRec* rec) {
     if (fDiscardableMemory != NULL) {
         if (fDiscardableMemory->lock()) {
+            fDiscardableMemoryIsLocked = true;
             rec->fPixels = fDiscardableMemory->data();
             rec->fColorTable = fCTable.get();
             rec->fRowBytes = fRowBytes;
@@ -46,16 +49,20 @@ bool SkDiscardablePixelRef::onNewLockPixels(LockRec* rec) {
         }
         SkDELETE(fDiscardableMemory);
         fDiscardableMemory = NULL;
+        fDiscardableMemoryIsLocked = false;
     }
 
     const size_t size = this->info().getSafeSize(fRowBytes);
 
     if (fDMFactory != NULL) {
         fDiscardableMemory = fDMFactory->create(size);
+        fDiscardableMemoryIsLocked = true;
     } else {
         fDiscardableMemory = SkDiscardableMemory::Create(size);
+        fDiscardableMemoryIsLocked = true;
     }
     if (NULL == fDiscardableMemory) {
+        fDiscardableMemoryIsLocked = false;
         return false;  // Memory allocation failed.
     }
 
@@ -72,6 +79,7 @@ bool SkDiscardablePixelRef::onNewLockPixels(LockRec* rec) {
             break;
         default:
             fDiscardableMemory->unlock();
+            fDiscardableMemoryIsLocked = false;
             SkDELETE(fDiscardableMemory);
             fDiscardableMemory = NULL;
             return false;
@@ -96,6 +104,7 @@ bool SkDiscardablePixelRef::onNewLockPixels(LockRec* rec) {
 
 void SkDiscardablePixelRef::onUnlockPixels() {
     fDiscardableMemory->unlock();
+    fDiscardableMemoryIsLocked = false;
 }
 
 bool SkInstallDiscardablePixelRef(SkImageGenerator* generator, SkBitmap* dst,

src/lazy/SkDiscardablePixelRef.h

@@ -41,6 +41,7 @@ private:
     // PixelRef, since the SkBitmap doesn't expect them to change.
 
     SkDiscardableMemory* fDiscardableMemory;
+    bool                 fDiscardableMemoryIsLocked;
     SkAutoTUnref<SkColorTable> fCTable;
 
     /* Takes ownership of SkImageGenerator. */