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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBitmap.h"
#include "SkBitmapController.h"
#include "SkBitmapProvider.h"
#include "SkMatrix.h"
#include "SkPixelRef.h"
#include "SkTemplates.h"
// RESIZE_LANCZOS3 is another good option, but chrome prefers mitchell at the moment
#define kHQ_RESIZE_METHOD SkBitmapScaler::RESIZE_MITCHELL
///////////////////////////////////////////////////////////////////////////////////////////////////
SkBitmapController::State* SkBitmapController::requestBitmap(const SkBitmapProvider& provider,
const SkMatrix& inv,
SkFilterQuality quality,
void* storage, size_t storageSize) {
if (!provider.validForDrawing()) {
return nullptr;
}
State* state = this->onRequestBitmap(provider, inv, quality, storage, storageSize);
if (state) {
if (nullptr == state->fPixmap.addr()) {
SkInPlaceDeleteCheck(state, storage);
state = nullptr;
}
}
return state;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#include "SkBitmapCache.h"
#include "SkBitmapScaler.h"
#include "SkMipMap.h"
#include "SkResourceCache.h"
class SkDefaultBitmapControllerState : public SkBitmapController::State {
public:
SkDefaultBitmapControllerState(const SkBitmapProvider&, const SkMatrix& inv, SkFilterQuality);
private:
SkBitmap fResultBitmap;
SkAutoTUnref<const SkMipMap> fCurrMip;
bool processHQRequest(const SkBitmapProvider&);
bool processMediumRequest(const SkBitmapProvider&);
};
// Check to see that the size of the bitmap that would be produced by
// scaling by the given inverted matrix is less than the maximum allowed.
static inline bool cache_size_okay(const SkBitmapProvider& provider, const SkMatrix& invMat) {
size_t maximumAllocation = SkResourceCache::GetEffectiveSingleAllocationByteLimit();
if (0 == maximumAllocation) {
return true;
}
// float matrixScaleFactor = 1.0 / (invMat.scaleX * invMat.scaleY);
// return ((origBitmapSize * matrixScaleFactor) < maximumAllocationSize);
// Skip the division step:
const size_t size = provider.info().getSafeSize(provider.info().minRowBytes());
SkScalar invScaleSqr = invMat.getScaleX() * invMat.getScaleY();
return size < (maximumAllocation * SkScalarAbs(invScaleSqr));
}
/*
* High quality is implemented by performing up-right scale-only filtering and then
* using bilerp for any remaining transformations.
*/
bool SkDefaultBitmapControllerState::processHQRequest(const SkBitmapProvider& provider) {
if (fQuality != kHigh_SkFilterQuality) {
return false;
}
// Our default return state is to downgrade the request to Medium, w/ or w/o setting fBitmap
// to a valid bitmap. If we succeed, we will set this to Low instead.
fQuality = kMedium_SkFilterQuality;
if (kN32_SkColorType != provider.info().colorType() || !cache_size_okay(provider, fInvMatrix) ||
fInvMatrix.hasPerspective())
{
return false; // can't handle the reqeust
}
SkScalar invScaleX = fInvMatrix.getScaleX();
SkScalar invScaleY = fInvMatrix.getScaleY();
if (fInvMatrix.getType() & SkMatrix::kAffine_Mask) {
SkSize scale;
if (!fInvMatrix.decomposeScale(&scale)) {
return false;
}
invScaleX = scale.width();
invScaleY = scale.height();
}
invScaleX = SkScalarAbs(invScaleX);
invScaleY = SkScalarAbs(invScaleY);
if (SkScalarNearlyEqual(invScaleX, 1) && SkScalarNearlyEqual(invScaleY, 1)) {
return false; // no need for HQ
}
if (invScaleX > 1 || invScaleY > 1) {
return false; // only use HQ when upsampling
}
const int dstW = SkScalarRoundToScalar(provider.width() / invScaleX);
const int dstH = SkScalarRoundToScalar(provider.height() / invScaleY);
const SkBitmapCacheDesc desc = provider.makeCacheDesc(dstW, dstH);
if (!SkBitmapCache::FindWH(desc, &fResultBitmap)) {
SkBitmap orig;
if (!provider.asBitmap(&orig)) {
return false;
}
SkAutoPixmapUnlock src;
if (!orig.requestLock(&src)) {
return false;
}
if (!SkBitmapScaler::Resize(&fResultBitmap, src.pixmap(), kHQ_RESIZE_METHOD,
dstW, dstH, SkResourceCache::GetAllocator())) {
return false; // we failed to create fScaledBitmap
}
SkASSERT(fResultBitmap.getPixels());
fResultBitmap.setImmutable();
if (!provider.isVolatile()) {
if (SkBitmapCache::AddWH(desc, fResultBitmap)) {
provider.notifyAddedToCache();
}
}
}
SkASSERT(fResultBitmap.getPixels());
fInvMatrix.postScale(SkIntToScalar(dstW) / provider.width(),
SkIntToScalar(dstH) / provider.height());
fQuality = kLow_SkFilterQuality;
return true;
}
/*
* Modulo internal errors, this should always succeed *if* the matrix is downscaling
* (in this case, we have the inverse, so it succeeds if fInvMatrix is upscaling)
*/
bool SkDefaultBitmapControllerState::processMediumRequest(const SkBitmapProvider& provider) {
SkASSERT(fQuality <= kMedium_SkFilterQuality);
if (fQuality != kMedium_SkFilterQuality) {
return false;
}
// Our default return state is to downgrade the request to Low, w/ or w/o setting fBitmap
// to a valid bitmap.
fQuality = kLow_SkFilterQuality;
SkSize invScaleSize;
if (!fInvMatrix.decomposeScale(&invScaleSize, nullptr)) {
return false;
}
if (invScaleSize.width() > SK_Scalar1 || invScaleSize.height() > SK_Scalar1) {
fCurrMip.reset(SkMipMapCache::FindAndRef(provider.makeCacheDesc()));
if (nullptr == fCurrMip.get()) {
SkBitmap orig;
if (!provider.asBitmap(&orig)) {
return false;
}
fCurrMip.reset(SkMipMapCache::AddAndRef(orig));
if (nullptr == fCurrMip.get()) {
return false;
}
}
// diagnostic for a crasher...
if (nullptr == fCurrMip->data()) {
sk_throw();
}
const SkSize scale = SkSize::Make(SkScalarInvert(invScaleSize.width()),
SkScalarInvert(invScaleSize.height()));
SkMipMap::Level level;
if (fCurrMip->extractLevel(scale, &level)) {
const SkSize& invScaleFixup = level.fScale;
fInvMatrix.postScale(invScaleFixup.width(), invScaleFixup.height());
// todo: if we could wrap the fCurrMip in a pixelref, then we could just install
// that here, and not need to explicitly track it ourselves.
return fResultBitmap.installPixels(level.fPixmap);
} else {
// failed to extract, so release the mipmap
fCurrMip.reset(nullptr);
}
}
return false;
}
SkDefaultBitmapControllerState::SkDefaultBitmapControllerState(const SkBitmapProvider& provider,
const SkMatrix& inv,
SkFilterQuality qual) {
fInvMatrix = inv;
fQuality = qual;
if (this->processHQRequest(provider) || this->processMediumRequest(provider)) {
SkASSERT(fResultBitmap.getPixels());
} else {
(void)provider.asBitmap(&fResultBitmap);
fResultBitmap.lockPixels();
// lock may fail to give us pixels
}
SkASSERT(fQuality <= kLow_SkFilterQuality);
// fResultBitmap.getPixels() may be null, but our caller knows to check fPixmap.addr()
// and will destroy us if it is nullptr.
fPixmap.reset(fResultBitmap.info(), fResultBitmap.getPixels(), fResultBitmap.rowBytes(),
fResultBitmap.getColorTable());
}
SkBitmapController::State* SkDefaultBitmapController::onRequestBitmap(const SkBitmapProvider& bm,
const SkMatrix& inverse,
SkFilterQuality quality,
void* storage, size_t size) {
return SkInPlaceNewCheck<SkDefaultBitmapControllerState>(storage, size, bm, inverse, quality);
}
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