| /* |
| * 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 "SkImage_Base.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 |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| int SkBitmapProvider::width() const { |
| return fImage ? fImage->width() : fBitmap.width(); |
| } |
| |
| int SkBitmapProvider::height() const { |
| return fImage ? fImage->height() : fBitmap.height(); |
| } |
| |
| uint32_t SkBitmapProvider::getID() const { |
| return fImage ? fImage->uniqueID() : fBitmap.getGenerationID(); |
| } |
| |
| bool SkBitmapProvider::validForDrawing() const { |
| if (!fImage) { |
| if (0 == fBitmap.width() || 0 == fBitmap.height()) { |
| return false; |
| } |
| if (nullptr == fBitmap.pixelRef()) { |
| return false; // no pixels to read |
| } |
| if (fBitmap.getTexture()) { |
| // we can handle texture (ugh) since lockPixels will perform a read-back |
| return true; |
| } |
| if (kIndex_8_SkColorType == fBitmap.colorType()) { |
| SkAutoLockPixels alp(fBitmap); // but we need to call it before getColorTable() is safe. |
| if (!fBitmap.getColorTable()) { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| SkImageInfo SkBitmapProvider::info() const { |
| if (fImage) { |
| SkAlphaType at = fImage->isOpaque() ? kOpaque_SkAlphaType : kPremul_SkAlphaType; |
| return SkImageInfo::MakeN32(fImage->width(), fImage->height(), at); |
| } else { |
| return fBitmap.info(); |
| } |
| } |
| |
| SkBitmapCacheDesc SkBitmapProvider::makeCacheDesc(int w, int h) const { |
| return fImage ? SkBitmapCacheDesc::Make(fImage, w, h) : SkBitmapCacheDesc::Make(fBitmap, w, h); |
| } |
| |
| SkBitmapCacheDesc SkBitmapProvider::makeCacheDesc() const { |
| return fImage ? SkBitmapCacheDesc::Make(fImage) : SkBitmapCacheDesc::Make(fBitmap); |
| } |
| |
| void SkBitmapProvider::notifyAddedToCache() const { |
| if (fImage) { |
| // TODO |
| } else { |
| fBitmap.pixelRef()->notifyAddedToCache(); |
| } |
| } |
| |
| bool SkBitmapProvider::asBitmap(SkBitmap* bm) const { |
| if (fImage) { |
| return as_IB(fImage)->getROPixels(bm); |
| } else { |
| *bm = fBitmap; |
| return true; |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| 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()); |
| return size < (maximumAllocation * invMat.getScaleX() * invMat.getScaleY()); |
| } |
| |
| /* |
| * 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(); |
| } |
| if (SkScalarNearlyEqual(invScaleX, 1) && SkScalarNearlyEqual(invScaleY, 1)) { |
| return false; // no need for HQ |
| } |
| |
| 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 (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; |
| } |
| SkScalar invScale = SkScalarSqrt(invScaleSize.width() * invScaleSize.height()); |
| |
| if (invScale > 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(); |
| } |
| |
| SkScalar levelScale = SkScalarInvert(invScale); |
| SkMipMap::Level level; |
| if (fCurrMip->extractLevel(levelScale, &level)) { |
| SkScalar invScaleFixup = level.fScale; |
| fInvMatrix.postScale(invScaleFixup, invScaleFixup); |
| |
| const SkImageInfo info = provider.info().makeWH(level.fWidth, level.fHeight); |
| // 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(info, level.fPixels, level.fRowBytes); |
| } 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); |
| } |
| |
