1/*
2 * Copyright 2017 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#ifndef GrAHardwareBufferImageGenerator_DEFINED
8#define GrAHardwareBufferImageGenerator_DEFINED
9
10#include "include/core/SkImageGenerator.h"
11
12#include "include/private/GrTypesPriv.h"
13
14class GrGpuResource;
15class GrSurfaceProxyView;
16
17extern "C" {
18 typedef struct AHardwareBuffer AHardwareBuffer;
19}
20
21/**
22 * GrAHardwareBufferImageGenerator allows to create an SkImage attached to
23 * an existing android native hardware buffer. A hardware buffer has to be
24 * created with AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE usage, because it is
25 * bound to an external texture using an EGLImage. The image generator will
26 * keep a reference to the hardware buffer for its lifetime. A hardware buffer
27 * can be shared between processes and same buffer can be used in multiple GPU
28 * contexts.
29 * To implement certain features like tiling, Skia may copy the texture to
30 * avoid OpenGL API limitations.
31 */
32class GrAHardwareBufferImageGenerator : public SkImageGenerator {
33public:
34 static std::unique_ptr<SkImageGenerator> Make(AHardwareBuffer*, SkAlphaType,
35 sk_sp<SkColorSpace>, GrSurfaceOrigin);
36
37 ~GrAHardwareBufferImageGenerator() override;
38
39 static void DeleteGLTexture(void* ctx);
40
41protected:
42
43 bool onIsValid(GrRecordingContext*) const override;
44
45 GrSurfaceProxyView onGenerateTexture(GrRecordingContext*, const SkImageInfo&, const SkIPoint&,
46 GrMipmapped, GrImageTexGenPolicy) override;
47
48private:
49 GrAHardwareBufferImageGenerator(const SkImageInfo&, AHardwareBuffer*, SkAlphaType,
50 bool isProtectedContent, uint32_t bufferFormat,
51 GrSurfaceOrigin surfaceOrigin);
52 GrSurfaceProxyView makeView(GrRecordingContext* context);
53
54 void releaseTextureRef();
55
56 static void ReleaseRefHelper_TextureReleaseProc(void* ctx);
57
58 AHardwareBuffer* fHardwareBuffer;
59 uint32_t fBufferFormat;
60 const bool fIsProtectedContent;
61 GrSurfaceOrigin fSurfaceOrigin;
62
63 typedef SkImageGenerator INHERITED;
64};
65#endif // GrAHardwareBufferImageGenerator_DEFINED
66