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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkDiscardablePixelRef.h"
#include "SkDiscardableMemory.h"
#include "SkImageGenerator.h"
SkDiscardablePixelRef::SkDiscardablePixelRef(const SkImageInfo& info,
SkImageGenerator* generator,
size_t rowBytes,
SkDiscardableMemory::Factory* fact)
: INHERITED(info)
, fGenerator(generator)
, fDMFactory(fact)
, fRowBytes(rowBytes)
, fDiscardableMemory(NULL)
{
SkASSERT(fGenerator != NULL);
SkASSERT(fRowBytes > 0);
// The SkImageGenerator contract requires fGenerator to always
// decode the same image on each call to getPixels().
this->setImmutable();
SkSafeRef(fDMFactory);
}
SkDiscardablePixelRef::~SkDiscardablePixelRef() {
if (this->isLocked()) {
fDiscardableMemory->unlock();
}
SkDELETE(fDiscardableMemory);
SkSafeUnref(fDMFactory);
SkDELETE(fGenerator);
}
void* SkDiscardablePixelRef::onLockPixels(SkColorTable**) {
if (fDiscardableMemory != NULL) {
if (fDiscardableMemory->lock()) {
return fDiscardableMemory->data();
}
SkDELETE(fDiscardableMemory);
fDiscardableMemory = NULL;
}
const size_t size = this->info().getSafeSize(fRowBytes);
if (fDMFactory != NULL) {
fDiscardableMemory = fDMFactory->create(size);
} else {
fDiscardableMemory = SkDiscardableMemory::Create(size);
}
if (NULL == fDiscardableMemory) {
return NULL; // Memory allocation failed.
}
void* pixels = fDiscardableMemory->data();
if (!fGenerator->getPixels(this->info(), pixels, fRowBytes)) {
fDiscardableMemory->unlock();
SkDELETE(fDiscardableMemory);
fDiscardableMemory = NULL;
return NULL;
}
return pixels;
}
void SkDiscardablePixelRef::onUnlockPixels() {
fDiscardableMemory->unlock();
}
bool SkInstallDiscardablePixelRef(SkImageGenerator* generator,
SkBitmap* dst,
SkDiscardableMemory::Factory* factory) {
SkImageInfo info;
SkAutoTDelete<SkImageGenerator> autoGenerator(generator);
if ((NULL == autoGenerator.get())
|| (!autoGenerator->getInfo(&info))
|| (!dst->setConfig(info, 0))) {
return false;
}
SkASSERT(dst->config() != SkBitmap::kNo_Config);
if (dst->empty()) { // Use a normal pixelref.
return dst->allocPixels(NULL, NULL);
}
SkAutoTUnref<SkDiscardablePixelRef> ref(
SkNEW_ARGS(SkDiscardablePixelRef,
(info, autoGenerator.detach(), dst->rowBytes(), factory)));
dst->setPixelRef(ref);
return true;
}
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