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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)
, fDiscardableMemoryIsLocked(false)
{
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 (fDiscardableMemoryIsLocked) {
fDiscardableMemory->unlock();
fDiscardableMemoryIsLocked = false;
}
delete fDiscardableMemory;
SkSafeUnref(fDMFactory);
delete fGenerator;
}
bool SkDiscardablePixelRef::onNewLockPixels(LockRec* rec) {
if (fDiscardableMemory != NULL) {
if (fDiscardableMemory->lock()) {
fDiscardableMemoryIsLocked = true;
rec->fPixels = fDiscardableMemory->data();
rec->fColorTable = fCTable.get();
rec->fRowBytes = fRowBytes;
return true;
}
delete fDiscardableMemory;
fDiscardableMemory = NULL;
fDiscardableMemoryIsLocked = false;
}
const size_t size = this->info().getSafeSize(fRowBytes);
if (fDMFactory != NULL) {
fDiscardableMemory = fDMFactory->create(size);
fDiscardableMemoryIsLocked = true;
} else {
fDiscardableMemory = SkDiscardableMemory::Create(size);
fDiscardableMemoryIsLocked = true;
}
if (NULL == fDiscardableMemory) {
fDiscardableMemoryIsLocked = false;
return false; // Memory allocation failed.
}
void* pixels = fDiscardableMemory->data();
const SkImageInfo& info = this->info();
SkPMColor colors[256];
int colorCount = 0;
if (!fGenerator->getPixels(info, pixels, fRowBytes, colors, &colorCount)) {
fDiscardableMemory->unlock();
fDiscardableMemoryIsLocked = false;
delete fDiscardableMemory;
fDiscardableMemory = NULL;
return false;
}
// Note: our ctable is not purgeable, as it is not stored in the discardablememory block.
// This is because SkColorTable is refcntable, and therefore our caller could hold onto it
// beyond the scope of a lock/unlock. If we change the API/lifecycle for SkColorTable, we
// could move it into the block, but then again perhaps it is small enough that this doesn't
// really matter.
if (colorCount > 0) {
fCTable.reset(new SkColorTable(colors, colorCount));
} else {
fCTable.reset(NULL);
}
rec->fPixels = pixels;
rec->fColorTable = fCTable.get();
rec->fRowBytes = fRowBytes;
return true;
}
void SkDiscardablePixelRef::onUnlockPixels() {
fDiscardableMemory->unlock();
fDiscardableMemoryIsLocked = false;
}
bool SkInstallDiscardablePixelRef(SkImageGenerator* generator, const SkIRect* subset, SkBitmap* dst,
SkDiscardableMemory::Factory* factory) {
SkAutoTDelete<SkImageGenerator> autoGenerator(generator);
if (NULL == autoGenerator.get()) {
return false;
}
SkImageInfo prInfo = autoGenerator->getInfo();
if (prInfo.isEmpty()) {
return false;
}
SkIPoint origin = SkIPoint::Make(0, 0);
SkImageInfo bmInfo = prInfo;
if (subset) {
const SkIRect prBounds = SkIRect::MakeWH(prInfo.width(), prInfo.height());
if (subset->isEmpty() || !prBounds.contains(*subset)) {
return false;
}
bmInfo = prInfo.makeWH(subset->width(), subset->height());
origin.set(subset->x(), subset->y());
}
// must compute our desired rowBytes w.r.t. the pixelRef's dimensions, not ours, which may be
// smaller.
if (!dst->setInfo(bmInfo, prInfo.minRowBytes())) {
return false;
}
// Since dst->setInfo() may have changed/fixed-up info, we check from the bitmap
SkASSERT(dst->info().colorType() != kUnknown_SkColorType);
if (dst->empty()) { // Use a normal pixelref.
return dst->tryAllocPixels();
}
SkAutoTUnref<SkDiscardablePixelRef> ref(
new SkDiscardablePixelRef(prInfo, autoGenerator.detach(), dst->rowBytes(), factory));
dst->setPixelRef(ref, origin.x(), origin.y());
return true;
}
// These are the public API
bool SkInstallDiscardablePixelRef(SkImageGenerator* generator, SkBitmap* dst) {
return SkInstallDiscardablePixelRef(generator, NULL, dst, NULL);
}
bool SkInstallDiscardablePixelRef(SkData* encoded, SkBitmap* dst) {
SkImageGenerator* generator = SkImageGenerator::NewFromEncoded(encoded);
return generator ? SkInstallDiscardablePixelRef(generator, NULL, dst, NULL) : false;
}
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