1 /*
2 * Copyright 2012 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_Base_DEFINED
9 #define SkImage_Base_DEFINED
10
11 #include "SkImage.h"
12 #include "SkSurface.h"
13
copy_or_safe_defaults(const SkSurfaceProps * props)14 static SkSurfaceProps copy_or_safe_defaults(const SkSurfaceProps* props) {
15 return props ? *props : SkSurfaceProps(0, kUnknown_SkPixelGeometry);
16 }
17
18 class SkImage_Base : public SkImage {
19 public:
SkImage_Base(int width,int height,const SkSurfaceProps * props)20 SkImage_Base(int width, int height, const SkSurfaceProps* props)
21 : INHERITED(width, height)
22 , fProps(copy_or_safe_defaults(props))
23 {}
24
25 /**
26 * If the props weren't know at constructor time, call this but only before the image is
27 * ever released into the wild (since the props field must appear to be immutable).
28 */
initWithProps(const SkSurfaceProps & props)29 void initWithProps(const SkSurfaceProps& props) {
30 SkASSERT(this->unique()); // only viewed by one thread
31 SkSurfaceProps* mutableProps = const_cast<SkSurfaceProps*>(&fProps);
32 SkASSERT(mutableProps != &props); // check for self-assignment
33 mutableProps->~SkSurfaceProps();
34 new (mutableProps) SkSurfaceProps(props);
35 }
36
props()37 const SkSurfaceProps& props() const { return fProps; }
38
39 virtual SkSurface* onNewSurface(const SkImageInfo&, const SkSurfaceProps&) const = 0;
40
onPeekPixels(SkImageInfo *,size_t *)41 virtual const void* onPeekPixels(SkImageInfo*, size_t* /*rowBytes*/) const {
42 return NULL;
43 }
44
45 // Default impl calls onDraw
46 virtual bool onReadPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
47 int srcX, int srcY) const;
48
onGetTexture()49 virtual GrTexture* onGetTexture() const { return NULL; }
50
51 // return a read-only copy of the pixels. We promise to not modify them,
52 // but only inspect them (or encode them).
getROPixels(SkBitmap *)53 virtual bool getROPixels(SkBitmap*) const { return false; }
54
onNewShader(SkShader::TileMode,SkShader::TileMode,const SkMatrix * localMatrix)55 virtual SkShader* onNewShader(SkShader::TileMode,
56 SkShader::TileMode,
57 const SkMatrix* localMatrix) const { return NULL; };
58
59 // newWidth > 0, newHeight > 0, subset either NULL or a proper subset of this bounds
60 virtual SkImage* onNewImage(int newWidth, int newHeight, const SkIRect* subset,
61 SkFilterQuality) const;
62
63 private:
64 const SkSurfaceProps fProps;
65
66 typedef SkImage INHERITED;
67 };
68
as_IB(SkImage * image)69 static inline SkImage_Base* as_IB(SkImage* image) {
70 return static_cast<SkImage_Base*>(image);
71 }
72
as_IB(const SkImage * image)73 static inline const SkImage_Base* as_IB(const SkImage* image) {
74 return static_cast<const SkImage_Base*>(image);
75 }
76
77 #endif
78