| /* |
| * 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 "SkArenaAlloc.h" |
| #include "SkBitmap.h" |
| #include "SkBitmapCache.h" |
| #include "SkBitmapController.h" |
| #include "SkBitmapProvider.h" |
| #include "SkMatrix.h" |
| #include "SkMipMap.h" |
| #include "SkTemplates.h" |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| SkBitmapController::State* SkBitmapController::RequestBitmap(const SkBitmapProvider& provider, |
| const SkMatrix& inv, |
| SkFilterQuality quality, |
| SkArenaAlloc* alloc) { |
| auto* state = alloc->make<SkBitmapController::State>(provider, inv, quality); |
| |
| return state->pixmap().addr() ? state : nullptr; |
| } |
| |
| bool SkBitmapController::State::processHighRequest(const SkBitmapProvider& provider) { |
| if (fQuality != kHigh_SkFilterQuality) { |
| return false; |
| } |
| |
| fQuality = kMedium_SkFilterQuality; |
| |
| 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 (invScaleX >= 1 - SK_ScalarNearlyZero || invScaleY >= 1 - SK_ScalarNearlyZero) { |
| // we're down-scaling so abort HQ |
| return false; |
| } |
| |
| // Confirmed that we can use HQ (w/ rasterpipeline) |
| fQuality = kHigh_SkFilterQuality; |
| (void)provider.asBitmap(&fResultBitmap); |
| 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 SkBitmapController::State::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()) { |
| fCurrMip.reset(SkMipMapCache::AddAndRef(provider)); |
| if (nullptr == fCurrMip.get()) { |
| return false; |
| } |
| } |
| // diagnostic for a crasher... |
| SkASSERT_RELEASE(fCurrMip->data()); |
| |
| 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; |
| } |
| |
| SkBitmapController::State::State(const SkBitmapProvider& provider, |
| const SkMatrix& inv, |
| SkFilterQuality qual) { |
| fInvMatrix = inv; |
| fQuality = qual; |
| |
| if (this->processHighRequest(provider) || this->processMediumRequest(provider)) { |
| SkASSERT(fResultBitmap.getPixels()); |
| } else { |
| (void)provider.asBitmap(&fResultBitmap); |
| } |
| |
| // 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()); |
| } |