| /* |
| * 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 "SkMatrix.h" |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| static bool valid_for_drawing(const SkBitmap& bm) { |
| if (0 == bm.width() || 0 == bm.height()) { |
| return false; // nothing to draw |
| } |
| if (NULL == bm.pixelRef()) { |
| return false; // no pixels to read |
| } |
| if (bm.getTexture()) { |
| // we can handle texture (ugh) since lockPixels will perform a read-back |
| return true; |
| } |
| if (kIndex_8_SkColorType == bm.colorType()) { |
| SkAutoLockPixels alp(bm); // but we need to call it before getColorTable() is safe. |
| if (!bm.getColorTable()) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| SkBitmapController::State* SkBitmapController::requestBitmap(const SkBitmap& bm, |
| const SkMatrix& inv, |
| SkFilterQuality quality, |
| void* storage, size_t storageSize) { |
| |
| if (!valid_for_drawing(bm)) { |
| return NULL; |
| } |
| |
| State* state = this->onRequestBitmap(bm, inv, quality, storage, storageSize); |
| if (state) { |
| if (!state->fLockedBitmap.getPixels()) { |
| state->fLockedBitmap.lockPixels(); |
| if (!state->fLockedBitmap.getPixels()) { |
| SkInPlaceDeleteCheck(state, storage); |
| state = NULL; |
| } |
| } |
| } |
| return state; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| #include "SkBitmapCache.h" |
| #include "SkBitmapScaler.h" |
| #include "SkMipMap.h" |
| #include "SkResourceCache.h" |
| |
| class SkDefaultBitmapControllerState : public SkBitmapController::State { |
| public: |
| SkDefaultBitmapControllerState(const SkBitmap& src, const SkMatrix& inv, SkFilterQuality qual); |
| |
| private: |
| SkAutoTUnref<const SkMipMap> fCurrMip; |
| |
| bool processHQRequest(const SkBitmap& orig); |
| bool processMediumRequest(const SkBitmap& orig); |
| }; |
| |
| // 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 SkBitmap& bm, 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 = bm.info().getSafeSize(bm.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 SkBitmap& origBitmap) { |
| 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 != origBitmap.colorType() || !cache_size_okay(origBitmap, 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 |
| } |
| |
| SkScalar trueDestWidth = origBitmap.width() / invScaleX; |
| SkScalar trueDestHeight = origBitmap.height() / invScaleY; |
| SkScalar roundedDestWidth = SkScalarRoundToScalar(trueDestWidth); |
| SkScalar roundedDestHeight = SkScalarRoundToScalar(trueDestHeight); |
| |
| if (!SkBitmapCache::Find(origBitmap, roundedDestWidth, roundedDestHeight, &fLockedBitmap)) { |
| if (!SkBitmapScaler::Resize(&fLockedBitmap, |
| origBitmap, |
| SkBitmapScaler::RESIZE_BEST, |
| roundedDestWidth, |
| roundedDestHeight, |
| SkResourceCache::GetAllocator())) { |
| return false; // we failed to create fScaledBitmap |
| } |
| |
| SkASSERT(fLockedBitmap.getPixels()); |
| fLockedBitmap.setImmutable(); |
| SkBitmapCache::Add(origBitmap, roundedDestWidth, roundedDestHeight, fLockedBitmap); |
| } |
| |
| SkASSERT(fLockedBitmap.getPixels()); |
| |
| fInvMatrix.postScale(roundedDestWidth / origBitmap.width(), |
| roundedDestHeight / origBitmap.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 SkBitmap& origBitmap) { |
| 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, NULL)) { |
| return false; |
| } |
| SkScalar invScale = SkScalarSqrt(invScaleSize.width() * invScaleSize.height()); |
| |
| if (invScale > SK_Scalar1) { |
| fCurrMip.reset(SkMipMapCache::FindAndRef(origBitmap)); |
| if (NULL == fCurrMip.get()) { |
| fCurrMip.reset(SkMipMapCache::AddAndRef(origBitmap)); |
| if (NULL == fCurrMip.get()) { |
| return false; |
| } |
| } |
| // diagnostic for a crasher... |
| if (NULL == 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 = origBitmap.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 fLockedBitmap.installPixels(info, level.fPixels, level.fRowBytes); |
| } else { |
| // failed to extract, so release the mipmap |
| fCurrMip.reset(NULL); |
| } |
| } |
| return false; |
| } |
| |
| SkDefaultBitmapControllerState::SkDefaultBitmapControllerState(const SkBitmap& src, |
| const SkMatrix& inv, |
| SkFilterQuality qual) { |
| fInvMatrix = inv; |
| fQuality = qual; |
| |
| if (!this->processHQRequest(src) && !this->processMediumRequest(src)) { |
| fLockedBitmap = src; |
| } |
| SkASSERT(fQuality <= kLow_SkFilterQuality); |
| } |
| |
| SkBitmapController::State* SkDefaultBitmapController::onRequestBitmap(const SkBitmap& bm, |
| const SkMatrix& inverse, |
| SkFilterQuality quality, |
| void* storage, size_t size) { |
| return SkInPlaceNewCheck<SkDefaultBitmapControllerState>(storage, size, bm, inverse, quality); |
| } |
| |