SkImagePriv.h revision 1195a28892d37ae9632e81e1bc2407cf644522d2 
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
14class SkPicture;
15
16extern SkBitmap::Config SkImageInfoToBitmapConfig(const SkImageInfo&);
17extern SkBitmap::Config SkColorTypeToBitmapConfig(SkColorType);
18extern bool SkBitmapConfigToColorType(SkBitmap::Config, SkColorType* ctOut);
19
20// Call this if you explicitly want to use/share this pixelRef in the image
21extern SkImage* SkNewImageFromPixelRef(const SkImageInfo&, SkPixelRef*,
22                                       size_t rowBytes);
23
24/**
25 *  Examines the bitmap to decide if it can share the existing pixelRef, or
26 *  if it needs to make a deep-copy of the pixels. The bitmap's pixelref will
27 *  be shared if either the bitmap is marked as immutable, or canSharePixelRef
28 *  is true.
29 *
30 *  If the bitmap's config cannot be converted into a corresponding
31 *  SkImageInfo, or the bitmap's pixels cannot be accessed, this will return
32 *  NULL.
33 */
34extern SkImage* SkNewImageFromBitmap(const SkBitmap&, bool canSharePixelRef);
35
36extern void SkImagePrivDrawPicture(SkCanvas*, SkPicture*,
37                                   SkScalar x, SkScalar y, const SkPaint*);
38
39extern void SkImagePrivDrawPicture(SkCanvas*, SkPicture*,
40                                   const SkRect*, const SkRect&, 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 */
46extern SkImage* SkNewImageFromPicture(const SkPicture*);
47
48static inline size_t SkImageMinRowBytes(const SkImageInfo& info) {
49    return SkAlign4(info.minRowBytes());
50}
51
52// Given an image created from SkNewImageFromBitmap, return its pixelref. This
53// may be called to see if the surface and the image share the same pixelref,
54// in which case the surface may need to perform a copy-on-write.
55extern SkPixelRef* SkBitmapImageGetPixelRef(SkImage* rasterImage);
56
57// Given an image created with NewPicture, return its SkPicture.
58extern SkPicture* SkPictureImageGetPicture(SkImage* pictureImage);
59
60// Given an image created with NewTexture, return its GrTexture. This
61// may be called to see if the surface and the image share the same GrTexture,
62// in which case the surface may need to perform a copy-on-write.
63extern GrTexture* SkTextureImageGetTexture(SkImage* textureImage);
64
65// Update the texture wrapped by an image created with NewTexture. This
66// is called when a surface and image share the same GrTexture and the
67// surface needs to perform a copy-on-write
68extern void SkTextureImageSetTexture(SkImage* image, GrTexture* texture);
69
70#endif
71