1/*
2 * Copyright 2018 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#ifndef SkImage_Lazy_DEFINED
9#define SkImage_Lazy_DEFINED
10
11#include "include/private/SkIDChangeListener.h"
12#include "include/private/SkMutex.h"
13#include "src/gpu/SkGr.h"
14#include "src/image/SkImage_Base.h"
15
16#if SK_SUPPORT_GPU
17#include "src/gpu/GrTextureMaker.h"
18#endif
19
20class SharedGenerator;
21
22class SkImage_Lazy : public SkImage_Base {
23public:
24 struct Validator {
25 Validator(sk_sp<SharedGenerator>, const SkColorType*, sk_sp<SkColorSpace>);
26
27 operator bool() const { return fSharedGenerator.get(); }
28
29 sk_sp<SharedGenerator> fSharedGenerator;
30 SkImageInfo fInfo;
31 sk_sp<SkColorSpace> fColorSpace;
32 uint32_t fUniqueID;
33 };
34
35 SkImage_Lazy(Validator* validator);
36
37 bool onReadPixels(const SkImageInfo&, void*, size_t, int srcX, int srcY,
38 CachingHint) const override;
39#if SK_SUPPORT_GPU
40 GrSurfaceProxyView refView(GrRecordingContext*, GrMipmapped) const override;
41#endif
42 sk_sp<SkData> onRefEncoded() const override;
43 sk_sp<SkImage> onMakeSubset(const SkIRect&, GrDirectContext*) const override;
44 bool getROPixels(SkBitmap*, CachingHint) const override;
45 bool onIsLazyGenerated() const override { return true; }
46 sk_sp<SkImage> onMakeColorTypeAndColorSpace(SkColorType, sk_sp<SkColorSpace>,
47 GrDirectContext*) const override;
48 sk_sp<SkImage> onReinterpretColorSpace(sk_sp<SkColorSpace>) const final;
49
50 bool onIsValid(GrRecordingContext*) const override;
51
52#if SK_SUPPORT_GPU
53 // Returns the texture proxy. CachingHint refers to whether the generator's output should be
54 // cached in CPU memory. We will always cache the generated texture on success.
55 GrSurfaceProxyView lockTextureProxyView(GrRecordingContext*,
56 GrImageTexGenPolicy,
57 GrMipmapped) const;
58
59 // Returns the GrColorType to use with the GrTextureProxy returned from lockTextureProxy. This
60 // may be different from the color type on the image in the case where we need up upload CPU
61 // data to a texture but the GPU doesn't support the format of CPU data. In this case we convert
62 // the data to RGBA_8888 unorm on the CPU then upload that.
63 GrColorType colorTypeOfLockTextureProxy(const GrCaps* caps) const;
64#endif
65
66private:
67 void addUniqueIDListener(sk_sp<SkIDChangeListener>) const;
68#if SK_SUPPORT_GPU
69 sk_sp<SkCachedData> getPlanes(SkYUVASizeInfo*,
70 SkYUVAIndex[4],
71 SkYUVColorSpace*,
72 const void* planes[4]) const;
73 GrSurfaceProxyView textureProxyViewFromPlanes(GrRecordingContext*, SkBudgeted) const;
74#endif
75
76 class ScopedGenerator;
77
78 // Note that this->imageInfo() is not necessarily the info from the generator. It may be
79 // cropped by onMakeSubset and its color type/space may be changed by
80 // onMakeColorTypeAndColorSpace.
81 sk_sp<SharedGenerator> fSharedGenerator;
82
83 // Repeated calls to onMakeColorTypeAndColorSpace will result in a proliferation of unique IDs
84 // and SkImage_Lazy instances. Cache the result of the last successful call.
85 mutable SkMutex fOnMakeColorTypeAndSpaceMutex;
86 mutable sk_sp<SkImage> fOnMakeColorTypeAndSpaceResult;
87
88#if SK_SUPPORT_GPU
89 // When the SkImage_Lazy goes away, we will iterate over all the listeners to inform them
90 // of the unique ID's demise. This is used to remove cached textures from GrContext.
91 mutable SkIDChangeListener::List fUniqueIDListeners;
92#endif
93
94 typedef SkImage_Base INHERITED;
95};
96
97#endif
98