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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());
}
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(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 find_and_return(const BitmapKey& key, SkBitmap* result) {
const BitmapRec* rec = (BitmapRec*)SkResourceCache::FindAndLock(key);
if (rec) {
*result = rec->fBitmap;
SkResourceCache::Unlock(rec);
result->lockPixels();
if (result->getPixels()) {
return true;
}
// todo: we should explicitly purge rec from the cache at this point, since
// it is effectively purged already (has no memory behind it)
result->reset();
// fall-through to false
}
return false;
}
bool SkBitmapCache::Find(const SkBitmap& src, SkScalar invScaleX, SkScalar invScaleY,
SkBitmap* result) {
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 find_and_return(key, result);
}
void SkBitmapCache::Add(const SkBitmap& src, SkScalar invScaleX, SkScalar invScaleY,
const SkBitmap& result) {
if (0 == invScaleX || 0 == invScaleY) {
// degenerate, and the key we use for mipmaps
return;
}
SkASSERT(result.isImmutable());
SkResourceCache::Add(SkNEW_ARGS(BitmapRec, (src.getGenerationID(), invScaleX, invScaleY,
get_bounds_from_bitmap(src), result)));
}
bool SkBitmapCache::Find(uint32_t genID, int width, int height, SkBitmap* result) {
BitmapKey key(genID, SK_Scalar1, SK_Scalar1, SkIRect::MakeWH(width, height));
return find_and_return(key, result);
}
void SkBitmapCache::Add(uint32_t genID, int width, int height, const SkBitmap& result) {
SkASSERT(result.isImmutable());
SkResourceCache::Add(SkNEW_ARGS(BitmapRec, (genID, SK_Scalar1, SK_Scalar1,
SkIRect::MakeWH(width, height), result)));
}
//////////////////////////////////////////////////////////////////////////////////////////
struct MipMapRec : public SkResourceCache::Rec {
MipMapRec(const SkBitmap& src, const SkMipMap* result)
: fKey(src.getGenerationID(), 0, 0, get_bounds_from_bitmap(src))
, fMipMap(SkRef(result))
{}
virtual ~MipMapRec() {
fMipMap->unref();
}
BitmapKey fKey;
const SkMipMap* fMipMap;
virtual const Key& getKey() const SK_OVERRIDE { return fKey; }
virtual size_t bytesUsed() const SK_OVERRIDE { return sizeof(fKey) + fMipMap->getSize(); }
};
const SkMipMap* SkMipMapCache::FindAndRef(const SkBitmap& src) {
BitmapKey key(src.getGenerationID(), 0, 0, get_bounds_from_bitmap(src));
const MipMapRec* rec = (MipMapRec*)SkResourceCache::FindAndLock(key);
const SkMipMap* result = NULL;
if (rec) {
result = SkRef(rec->fMipMap);
SkResourceCache::Unlock(rec);
}
return result;
}
void SkMipMapCache::Add(const SkBitmap& src, const SkMipMap* result) {
if (result) {
SkResourceCache::Add(SkNEW_ARGS(MipMapRec, (src, result)));
}
}
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