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