| /* |
| * 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) { |
| 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; |
| sk_sp<const SkMipMap> fCurrMip; |
| |
| bool processExternalRequest(const SkBitmapProvider&); |
| 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)); |
| } |
| |
| /* |
| * Image generators can provide access to externally managed pixels |
| * (external scale/decode caches). |
| */ |
| bool SkDefaultBitmapControllerState::processExternalRequest(const SkBitmapProvider& provider) { |
| // TODO: actual srcRect |
| |
| const SkRect src = SkRect::MakeIWH(provider.width(), provider.height()); |
| SkRect adjustedSrc; |
| |
| if (!provider.accessScaledImage(src, fInvMatrix, fQuality, |
| &fResultBitmap, &adjustedSrc, &fQuality)) { |
| return false; |
| } |
| |
| fInvMatrix.postConcat(SkMatrix::MakeRectToRect(src, adjustedSrc, SkMatrix::kFill_ScaleToFit)); |
| fResultBitmap.lockPixels(); |
| SkASSERT(fResultBitmap.getPixels()); |
| |
| return true; |
| } |
| |
| /* |
| * 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; |
| } |
| |
| SkDestinationSurfaceColorMode colorMode = provider.dstColorSpace() |
| ? SkDestinationSurfaceColorMode::kGammaAndColorSpaceAware |
| : SkDestinationSurfaceColorMode::kLegacy; |
| if (invScaleSize.width() > SK_Scalar1 || invScaleSize.height() > SK_Scalar1) { |
| fCurrMip.reset(SkMipMapCache::FindAndRef(provider.makeCacheDesc(), colorMode)); |
| if (nullptr == fCurrMip.get()) { |
| SkBitmap orig; |
| if (!provider.asBitmap(&orig)) { |
| return false; |
| } |
| fCurrMip.reset(SkMipMapCache::AddAndRef(orig, colorMode)); |
| 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; |
| |
| bool processed = this->processExternalRequest(provider); |
| |
| // Externally handled requests are not guaranteed to reduce quality below kMedium -- so we |
| // always give our internal processors a shot. |
| processed |= this->processHQRequest(provider) || this->processMediumRequest(provider); |
| |
| if (processed) { |
| 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); |
| } |