digiKam Developer Documentation: Digikam::LensDistortionPixelAccess Class Reference

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Public Member Functions | Protected Member Functions | List of all members
Digikam::LensDistortionPixelAccess Class Reference

LensDistortionPixelAccess class: solving the eternal problem: random, cubic-interpolated, sub-pixel coordinate access to an image. More...

## Public Member Functions
| LensDistortionPixelAccess (DImg *srcImage)
void | pixelAccessGetCubic (double srcX, double srcY, double brighten, uchar *dst)

## Protected Member Functions
void | cubicInterpolate (uchar *src, int rowStride, uchar *dst, bool sixteenBit, double dx, double dy, double brighten)
uchar * | pixelAccessAddress (int i, int j)
void | pixelAccessDoEdge (int i, int j)
void | pixelAccessReposition (int xInt, int yInt)
void | pixelAccessSelectRegion (int n)

## Detailed Description

Assuming that accesses are at least slightly coherent, LensDistortionPixelAccess keeps LensDistortionPixelAccessRegions buffers, each containing a LensDistortionPixelAccessWidth x LensDistortionPixelAccessHeight region of pixels. Buffer[0] is always checked first, so move the last accessed region into that position. When a request arrives which is outside all the regions, get a new region. The new region is placed so that the requested pixel is positioned at [LensDistortionPixelAccessXOffset, LensDistortionPixelAccessYOffset] in the region.