diff options
Diffstat (limited to 'include/core/SkImage.h')
| -rw-r--r-- | include/core/SkImage.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/core/SkImage.h b/include/core/SkImage.h index 8d65870dc0..b0587b2c3a 100644 --- a/include/core/SkImage.h +++ b/include/core/SkImage.h @@ -8,6 +8,7 @@ #ifndef SkImage_DEFINED #define SkImage_DEFINED +#include "SkFilterQuality.h" #include "SkImageInfo.h" #include "SkImageEncoder.h" #include "SkRefCnt.h" @@ -132,6 +133,27 @@ public: const char* toString(SkString*) const; + /** + * Return an image that is a rescale of this image (using newWidth, newHeight). + * + * If subset is NULL, then the entire original image is used as the src for the scaling. + * If subset is not NULL, then it specifies subset of src-pixels used for scaling. If + * subset extends beyond the bounds of the original image, then NULL is returned. + * + * Notes: + * - newWidth and newHeight must be > 0 or NULL will be returned. + * + * - it is legal for the returned image to be the same instance as the src image + * (if the new dimensions == the src dimensions and subset is NULL or == src dimensions). + * + * - it is legal for the "scaled" image to have changed its SkAlphaType from unpremul + * to premul (as required by the impl). The image should draw (nearly) identically, + * since during drawing we will "apply the alpha" to the pixels. Future optimizations + * may take away this caveat, preserving unpremul. + */ + SkImage* newImage(int newWidth, int newHeight, const SkIRect* subset = NULL, + SkFilterQuality = kNone_SkFilterQuality) const; + protected: SkImage(int width, int height) : fWidth(width), |