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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBitmapCache.h"
#include "SkResourceCache.h"
#include "SkMipMap.h"
#include "SkRect.h"
SkBitmap::Allocator* SkBitmapCache::GetAllocator() {
return SkResourceCache::GetAllocator();
}
/**
This function finds the bounds of the bitmap *within its pixelRef*.
If the bitmap lacks a pixelRef, it will return an empty rect, since
that doesn't make sense. This may be a useful enough function that
it should be somewhere else (in SkBitmap?).
*/
static SkIRect get_bounds_from_bitmap(const SkBitmap& bm) {
if (!(bm.pixelRef())) {
return SkIRect::MakeEmpty();
}
SkIPoint origin = bm.pixelRefOrigin();
return SkIRect::MakeXYWH(origin.fX, origin.fY, bm.width(), bm.height());
}
namespace {
static unsigned gBitmapKeyNamespaceLabel;
struct BitmapKey : public SkResourceCache::Key {
public:
BitmapKey(uint32_t genID, SkScalar scaleX, SkScalar scaleY, const SkIRect& bounds)
: fGenID(genID)
, fScaleX(scaleX)
, fScaleY(scaleY)
, fBounds(bounds)
{
this->init(&gBitmapKeyNamespaceLabel,
sizeof(fGenID) + sizeof(fScaleX) + sizeof(fScaleY) + sizeof(fBounds));
}
uint32_t fGenID;
SkScalar fScaleX;
SkScalar fScaleY;
SkIRect fBounds;
};
//////////////////////////////////////////////////////////////////////////////////////////
struct BitmapRec : public SkResourceCache::Rec {
BitmapRec(uint32_t genID, SkScalar scaleX, SkScalar scaleY, const SkIRect& bounds,
const SkBitmap& result)
: fKey(genID, scaleX, scaleY, bounds)
, fBitmap(result)
{}
BitmapKey fKey;
SkBitmap fBitmap;
virtual const Key& getKey() const SK_OVERRIDE { return fKey; }
virtual size_t bytesUsed() const SK_OVERRIDE { return sizeof(fKey) + fBitmap.getSize(); }
static bool Visitor(const SkResourceCache::Rec& baseRec, void* contextBitmap) {
const BitmapRec& rec = static_cast<const BitmapRec&>(baseRec);
SkBitmap* result = (SkBitmap*)contextBitmap;
*result = rec.fBitmap;
result->lockPixels();
return SkToBool(result->getPixels());
}
};
} // namespace
#define CHECK_LOCAL(localCache, localName, globalName, ...) \
((localCache) ? localCache->localName(__VA_ARGS__) : SkResourceCache::globalName(__VA_ARGS__))
bool SkBitmapCache::Find(const SkBitmap& src, SkScalar invScaleX, SkScalar invScaleY, SkBitmap* result,
SkResourceCache* localCache) {
if (0 == invScaleX || 0 == invScaleY) {
// degenerate, and the key we use for mipmaps
return false;
}
BitmapKey key(src.getGenerationID(), invScaleX, invScaleY, get_bounds_from_bitmap(src));
return CHECK_LOCAL(localCache, find, Find, key, BitmapRec::Visitor, result);
}
void SkBitmapCache::Add(const SkBitmap& src, SkScalar invScaleX, SkScalar invScaleY,
const SkBitmap& result, SkResourceCache* localCache) {
if (0 == invScaleX || 0 == invScaleY) {
// degenerate, and the key we use for mipmaps
return;
}
SkASSERT(result.isImmutable());
BitmapRec* rec = SkNEW_ARGS(BitmapRec, (src.getGenerationID(), invScaleX, invScaleY,
get_bounds_from_bitmap(src), result));
CHECK_LOCAL(localCache, add, Add, rec);
}
bool SkBitmapCache::Find(uint32_t genID, const SkIRect& subset, SkBitmap* result,
SkResourceCache* localCache) {
BitmapKey key(genID, SK_Scalar1, SK_Scalar1, subset);
return CHECK_LOCAL(localCache, find, Find, key, BitmapRec::Visitor, result);
}
bool SkBitmapCache::Add(uint32_t genID, const SkIRect& subset, const SkBitmap& result,
SkResourceCache* localCache) {
SkASSERT(result.isImmutable());
if (subset.isEmpty()
|| subset.top() < 0
|| subset.left() < 0
|| result.width() != subset.width()
|| result.height() != subset.height()) {
return false;
} else {
BitmapRec* rec = SkNEW_ARGS(BitmapRec, (genID, SK_Scalar1, SK_Scalar1, subset, result));
CHECK_LOCAL(localCache, add, Add, rec);
return true;
}
}
//////////////////////////////////////////////////////////////////////////////////////////
struct MipMapRec : public SkResourceCache::Rec {
MipMapRec(const SkBitmap& src, const SkMipMap* result)
: fKey(src.getGenerationID(), 0, 0, get_bounds_from_bitmap(src))
, fMipMap(result)
{
fMipMap->attachToCacheAndRef();
}
virtual ~MipMapRec() {
fMipMap->detachFromCacheAndUnref();
}
virtual const Key& getKey() const SK_OVERRIDE { return fKey; }
virtual size_t bytesUsed() const SK_OVERRIDE { return sizeof(fKey) + fMipMap->size(); }
static bool Visitor(const SkResourceCache::Rec& baseRec, void* contextMip) {
const MipMapRec& rec = static_cast<const MipMapRec&>(baseRec);
const SkMipMap* mm = SkRef(rec.fMipMap);
// the call to ref() above triggers a "lock" in the case of discardable memory,
// which means we can now check for null (in case the lock failed).
if (NULL == mm->data()) {
mm->unref(); // balance our call to ref()
return false;
}
// the call must call unref() when they are done.
*(const SkMipMap**)contextMip = mm;
return true;
}
private:
BitmapKey fKey;
const SkMipMap* fMipMap;
};
const SkMipMap* SkMipMapCache::FindAndRef(const SkBitmap& src, SkResourceCache* localCache) {
BitmapKey key(src.getGenerationID(), 0, 0, get_bounds_from_bitmap(src));
const SkMipMap* result;
if (!CHECK_LOCAL(localCache, find, Find, key, MipMapRec::Visitor, &result)) {
result = NULL;
}
return result;
}
static SkResourceCache::DiscardableFactory get_fact(SkResourceCache* localCache) {
return localCache ? localCache->GetDiscardableFactory()
: SkResourceCache::GetDiscardableFactory();
}
const SkMipMap* SkMipMapCache::AddAndRef(const SkBitmap& src, SkResourceCache* localCache) {
SkMipMap* mipmap = SkMipMap::Build(src, get_fact(localCache));
if (mipmap) {
MipMapRec* rec = SkNEW_ARGS(MipMapRec, (src, mipmap));
CHECK_LOCAL(localCache, add, Add, rec);
}
return mipmap;
}
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