const GrStencilAndCoverTextContext::TextBlob&
GrStencilAndCoverTextContext::findOrCreateTextBlob(const SkTextBlob* skBlob,
const SkPaint& skPaint) {
// The font-related parameters are baked into the text blob and will override this skPaint, so
// the only remaining properties that can affect a TextBlob are the ones related to stroke.
if (SkPaint::kFill_Style == skPaint.getStyle()) { // Fast path.
if (TextBlob** found = fBlobIdCache.find(skBlob->uniqueID())) {
fLRUList.remove(*found);
fLRUList.addToTail(*found);
return **found;
}
TextBlob* blob = new TextBlob(skBlob->uniqueID(), skBlob, skPaint, fContext,
&fSurfaceProps);
this->purgeToFit(*blob);
fBlobIdCache.set(skBlob->uniqueID(), blob);
fLRUList.addToTail(blob);
fCacheSize += blob->cpuMemorySize();
return *blob;
} else {
GrStrokeInfo stroke(skPaint);
SkSTArray<4, uint32_t, true> key;
key.reset(1 + stroke.computeUniqueKeyFragmentData32Cnt());
key[0] = skBlob->uniqueID();
stroke.asUniqueKeyFragment(&key[1]);
if (TextBlob** found = fBlobKeyCache.find(key)) {
fLRUList.remove(*found);
fLRUList.addToTail(*found);
return **found;
}
TextBlob* blob = new TextBlob(key, skBlob, skPaint, fContext, &fSurfaceProps);
this->purgeToFit(*blob);
fBlobKeyCache.set(blob);
fLRUList.addToTail(blob);
fCacheSize += blob->cpuMemorySize();
return *blob;
}
}
void GrStencilAndCoverTextContext::purgeToFit(const TextBlob& blob) {
static const size_t maxCacheSize = 4 * 1024 * 1024; // Allow up to 4 MB for caching text blobs.
size_t maxSizeForNewBlob = maxCacheSize - blob.cpuMemorySize();
while (fCacheSize && fCacheSize > maxSizeForNewBlob) {
TextBlob* lru = fLRUList.head();
if (1 == lru->key().count()) {
// 1-length keys are unterstood to be the blob id.
fBlobIdCache.remove(lru->key()[0]);
} else {
fBlobKeyCache.remove(lru->key());
}
fLRUList.remove(lru);
fCacheSize -= lru->cpuMemorySize();
delete lru;
}
}
