The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/gfx/skia/trunk/src/lazy/SkCachingPixelRef.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,97 @@
     1.4 +/*
     1.5 + * Copyright 2013 Google Inc.
     1.6 + *
     1.7 + * Use of this source code is governed by a BSD-style license that can be
     1.8 + * found in the LICENSE file.
     1.9 + */
    1.10 +
    1.11 +#include "SkCachingPixelRef.h"
    1.12 +#include "SkScaledImageCache.h"
    1.13 +
    1.14 +bool SkCachingPixelRef::Install(SkImageGenerator* generator,
    1.15 +                                SkBitmap* dst) {
    1.16 +    SkImageInfo info;
    1.17 +    SkASSERT(dst != NULL);
    1.18 +    if ((NULL == generator)
    1.19 +        || !(generator->getInfo(&info))
    1.20 +        || !dst->setConfig(info, 0)) {
    1.21 +        SkDELETE(generator);
    1.22 +        return false;
    1.23 +    }
    1.24 +    SkAutoTUnref<SkCachingPixelRef> ref(SkNEW_ARGS(SkCachingPixelRef,
    1.25 +                                           (info, generator, dst->rowBytes())));
    1.26 +    dst->setPixelRef(ref);
    1.27 +    return true;
    1.28 +}
    1.29 +
    1.30 +SkCachingPixelRef::SkCachingPixelRef(const SkImageInfo& info,
    1.31 +                                     SkImageGenerator* generator,
    1.32 +                                     size_t rowBytes)
    1.33 +    : INHERITED(info)
    1.34 +    , fImageGenerator(generator)
    1.35 +    , fErrorInDecoding(false)
    1.36 +    , fScaledCacheId(NULL)
    1.37 +    , fRowBytes(rowBytes) {
    1.38 +    SkASSERT(fImageGenerator != NULL);
    1.39 +}
    1.40 +SkCachingPixelRef::~SkCachingPixelRef() {
    1.41 +    SkDELETE(fImageGenerator);
    1.42 +    SkASSERT(NULL == fScaledCacheId);
    1.43 +    // Assert always unlock before unref.
    1.44 +}
    1.45 +
    1.46 +bool SkCachingPixelRef::onNewLockPixels(LockRec* rec) {
    1.47 +    if (fErrorInDecoding) {
    1.48 +        return false;  // don't try again.
    1.49 +    }
    1.50 +
    1.51 +    const SkImageInfo& info = this->info();
    1.52 +    SkBitmap bitmap;
    1.53 +    SkASSERT(NULL == fScaledCacheId);
    1.54 +    fScaledCacheId = SkScaledImageCache::FindAndLock(this->getGenerationID(),
    1.55 +                                                     info.fWidth,
    1.56 +                                                     info.fHeight,
    1.57 +                                                     &bitmap);
    1.58 +    if (NULL == fScaledCacheId) {
    1.59 +        // Cache has been purged, must re-decode.
    1.60 +        if ((!bitmap.setConfig(info, fRowBytes)) || !bitmap.allocPixels()) {
    1.61 +            fErrorInDecoding = true;
    1.62 +            return false;
    1.63 +        }
    1.64 +        SkAutoLockPixels autoLockPixels(bitmap);
    1.65 +        if (!fImageGenerator->getPixels(info, bitmap.getPixels(), fRowBytes)) {
    1.66 +            fErrorInDecoding = true;
    1.67 +            return false;
    1.68 +        }
    1.69 +        fScaledCacheId = SkScaledImageCache::AddAndLock(this->getGenerationID(),
    1.70 +                                                        info.fWidth,
    1.71 +                                                        info.fHeight,
    1.72 +                                                        bitmap);
    1.73 +        SkASSERT(fScaledCacheId != NULL);
    1.74 +    }
    1.75 +
    1.76 +    // Now bitmap should contain a concrete PixelRef of the decoded
    1.77 +    // image.
    1.78 +    SkAutoLockPixels autoLockPixels(bitmap);
    1.79 +    void* pixels = bitmap.getPixels();
    1.80 +    SkASSERT(pixels != NULL);
    1.81 +
    1.82 +    // At this point, the autoLockPixels will unlockPixels()
    1.83 +    // to remove bitmap's lock on the pixels.  We will then
    1.84 +    // destroy bitmap.  The *only* guarantee that this pointer
    1.85 +    // remains valid is the guarantee made by
    1.86 +    // SkScaledImageCache that it will not destroy the *other*
    1.87 +    // bitmap (SkScaledImageCache::Rec.fBitmap) that holds a
    1.88 +    // reference to the concrete PixelRef while this record is
    1.89 +    // locked.
    1.90 +    rec->fPixels = pixels;
    1.91 +    rec->fColorTable = NULL;
    1.92 +    rec->fRowBytes = bitmap.rowBytes();
    1.93 +    return true;
    1.94 +}
    1.95 +
    1.96 +void SkCachingPixelRef::onUnlockPixels() {
    1.97 +    SkASSERT(fScaledCacheId != NULL);
    1.98 +    SkScaledImageCache::Unlock( static_cast<SkScaledImageCache::ID*>(fScaledCacheId));
    1.99 +    fScaledCacheId = NULL;
   1.100 +}