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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 SkImagePriv_DEFINED
9 #define SkImagePriv_DEFINED
10 
11 #include "SkBitmap.h"
12 #include "SkImage.h"
13 
14 class SkPicture;
15 
16 extern SkBitmap::Config SkImageInfoToBitmapConfig(const SkImage::Info&,
17                                                   bool* isOpaque);
18 
19 extern int SkImageBytesPerPixel(SkImage::ColorType);
20 
21 extern bool SkBitmapToImageInfo(const SkBitmap&, SkImage::Info*);
22 
23 // Call this if you explicitly want to use/share this pixelRef in the image
24 extern SkImage* SkNewImageFromPixelRef(const SkImage::Info&, SkPixelRef*,
25                                        size_t rowBytes);
26 
27 /**
28  *  Examines the bitmap to decide if it can share the existing pixelRef, or
29  *  if it needs to make a deep-copy of the pixels. The bitmap's pixelref will
30  *  be shared if either the bitmap is marked as immutable, or canSharePixelRef
31  *  is true.
32  *
33  *  If the bitmap's config cannot be converted into a corresponding
34  *  SkImage::Info, or the bitmap's pixels cannot be accessed, this will return
35  *  NULL.
36  */
37 extern SkImage* SkNewImageFromBitmap(const SkBitmap&, bool canSharePixelRef);
38 
39 extern void SkImagePrivDrawPicture(SkCanvas*, SkPicture*,
40                                    SkScalar x, SkScalar y, const SkPaint*);
41 
42 /**
43  *  Return an SkImage whose contents are those of the specified picture. Note:
44  *  The picture itself is unmodified, and may continue to be used for recording
45  */
46 extern SkImage* SkNewImageFromPicture(const SkPicture*);
47 
SkImageMinRowBytes(const SkImage::Info & info)48 static inline size_t SkImageMinRowBytes(const SkImage::Info& info) {
49     size_t rb = info.fWidth * SkImageBytesPerPixel(info.fColorType);
50     return SkAlign4(rb);
51 }
52 
53 // Given an image created from SkNewImageFromBitmap, return its pixelref. This
54 // may be called to see if the surface and the image share the same pixelref,
55 // in which case the surface may need to perform a copy-on-write.
56 extern SkPixelRef* SkBitmapImageGetPixelRef(SkImage* rasterImage);
57 
58 // Given an image created with NewTexture, return its GrTexture. This
59 // may be called to see if the surface and the image share the same GrTexture,
60 // in which case the surface may need to perform a copy-on-write.
61 extern GrTexture* SkTextureImageGetTexture(SkImage* rasterImage);
62 
63 // Update the texture wrapped by an image created with NewTexture. This
64 // is called when a surface and image share the same GrTexture and the
65 // surface needs to perform a copy-on-write
66 extern void SkTextureImageSetTexture(SkImage* image, GrTexture* texture);
67 
68 #endif
69