1 /*
2 * Copyright 2015 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SkBitmap.h"
9 #include "SkBitmapCache.h"
10 #include "SkBitmapController.h"
11 #include "SkBitmapProvider.h"
12 #include "SkMatrix.h"
13 #include "SkMipMap.h"
14 #include "SkTemplates.h"
15
16 ///////////////////////////////////////////////////////////////////////////////////////////////////
17
requestBitmap(const SkBitmapProvider & provider,const SkMatrix & inv,SkFilterQuality quality,void * storage,size_t storageSize)18 SkBitmapController::State* SkBitmapController::requestBitmap(const SkBitmapProvider& provider,
19 const SkMatrix& inv,
20 SkFilterQuality quality,
21 void* storage, size_t storageSize) {
22 State* state = this->onRequestBitmap(provider, inv, quality, storage, storageSize);
23 if (state) {
24 if (nullptr == state->fPixmap.addr()) {
25 SkInPlaceDeleteCheck(state, storage);
26 state = nullptr;
27 }
28 }
29 return state;
30 }
31
32 ///////////////////////////////////////////////////////////////////////////////////////////////////
33
34 class SkDefaultBitmapControllerState : public SkBitmapController::State {
35 public:
36 SkDefaultBitmapControllerState(const SkBitmapProvider&, const SkMatrix& inv, SkFilterQuality);
37
38 private:
39 SkBitmap fResultBitmap;
40 sk_sp<const SkMipMap> fCurrMip;
41
42 bool processHighRequest(const SkBitmapProvider&);
43 bool processMediumRequest(const SkBitmapProvider&);
44 };
45
processHighRequest(const SkBitmapProvider & provider)46 bool SkDefaultBitmapControllerState::processHighRequest(const SkBitmapProvider& provider) {
47 if (fQuality != kHigh_SkFilterQuality) {
48 return false;
49 }
50
51 fQuality = kMedium_SkFilterQuality;
52
53 SkScalar invScaleX = fInvMatrix.getScaleX();
54 SkScalar invScaleY = fInvMatrix.getScaleY();
55 if (fInvMatrix.getType() & SkMatrix::kAffine_Mask) {
56 SkSize scale;
57 if (!fInvMatrix.decomposeScale(&scale)) {
58 return false;
59 }
60 invScaleX = scale.width();
61 invScaleY = scale.height();
62 }
63 invScaleX = SkScalarAbs(invScaleX);
64 invScaleY = SkScalarAbs(invScaleY);
65
66 if (invScaleX >= 1 - SK_ScalarNearlyZero || invScaleY >= 1 - SK_ScalarNearlyZero) {
67 // we're down-scaling so abort HQ
68 return false;
69 }
70
71 // Confirmed that we can use HQ (w/ rasterpipeline)
72 fQuality = kHigh_SkFilterQuality;
73 (void)provider.asBitmap(&fResultBitmap);
74 return true;
75 }
76
77 /*
78 * Modulo internal errors, this should always succeed *if* the matrix is downscaling
79 * (in this case, we have the inverse, so it succeeds if fInvMatrix is upscaling)
80 */
processMediumRequest(const SkBitmapProvider & provider)81 bool SkDefaultBitmapControllerState::processMediumRequest(const SkBitmapProvider& provider) {
82 SkASSERT(fQuality <= kMedium_SkFilterQuality);
83 if (fQuality != kMedium_SkFilterQuality) {
84 return false;
85 }
86
87 // Our default return state is to downgrade the request to Low, w/ or w/o setting fBitmap
88 // to a valid bitmap.
89 fQuality = kLow_SkFilterQuality;
90
91 SkSize invScaleSize;
92 if (!fInvMatrix.decomposeScale(&invScaleSize, nullptr)) {
93 return false;
94 }
95
96 SkDestinationSurfaceColorMode colorMode = provider.dstColorSpace()
97 ? SkDestinationSurfaceColorMode::kGammaAndColorSpaceAware
98 : SkDestinationSurfaceColorMode::kLegacy;
99 if (invScaleSize.width() > SK_Scalar1 || invScaleSize.height() > SK_Scalar1) {
100 fCurrMip.reset(SkMipMapCache::FindAndRef(provider.makeCacheDesc(), colorMode));
101 if (nullptr == fCurrMip.get()) {
102 SkBitmap orig;
103 if (!provider.asBitmap(&orig)) {
104 return false;
105 }
106 fCurrMip.reset(SkMipMapCache::AddAndRef(orig, colorMode));
107 if (nullptr == fCurrMip.get()) {
108 return false;
109 }
110 }
111 // diagnostic for a crasher...
112 SkASSERT_RELEASE(fCurrMip->data());
113
114 const SkSize scale = SkSize::Make(SkScalarInvert(invScaleSize.width()),
115 SkScalarInvert(invScaleSize.height()));
116 SkMipMap::Level level;
117 if (fCurrMip->extractLevel(scale, &level)) {
118 const SkSize& invScaleFixup = level.fScale;
119 fInvMatrix.postScale(invScaleFixup.width(), invScaleFixup.height());
120
121 // todo: if we could wrap the fCurrMip in a pixelref, then we could just install
122 // that here, and not need to explicitly track it ourselves.
123 return fResultBitmap.installPixels(level.fPixmap);
124 } else {
125 // failed to extract, so release the mipmap
126 fCurrMip.reset(nullptr);
127 }
128 }
129 return false;
130 }
131
SkDefaultBitmapControllerState(const SkBitmapProvider & provider,const SkMatrix & inv,SkFilterQuality qual)132 SkDefaultBitmapControllerState::SkDefaultBitmapControllerState(const SkBitmapProvider& provider,
133 const SkMatrix& inv,
134 SkFilterQuality qual) {
135 fInvMatrix = inv;
136 fQuality = qual;
137
138 if (this->processHighRequest(provider) || this->processMediumRequest(provider)) {
139 SkASSERT(fResultBitmap.getPixels());
140 } else {
141 (void)provider.asBitmap(&fResultBitmap);
142 }
143
144 // fResultBitmap.getPixels() may be null, but our caller knows to check fPixmap.addr()
145 // and will destroy us if it is nullptr.
146 fPixmap.reset(fResultBitmap.info(), fResultBitmap.getPixels(), fResultBitmap.rowBytes());
147 }
148
onRequestBitmap(const SkBitmapProvider & bm,const SkMatrix & inverse,SkFilterQuality quality,void * storage,size_t size)149 SkBitmapController::State* SkDefaultBitmapController::onRequestBitmap(const SkBitmapProvider& bm,
150 const SkMatrix& inverse,
151 SkFilterQuality quality,
152 void* storage, size_t size) {
153 return SkInPlaceNewCheck<SkDefaultBitmapControllerState>(storage, size, bm, inverse, quality);
154 }
155