SkWritePixelsRec Struct Reference

#include <SkWritePixelsRec.h>

Public Member Functions
	SkWritePixelsRec (const SkImageInfo &info, const void *pixels, size_t rowBytes, int x, int y)
	SkWritePixelsRec (const SkPixmap &pm, int x, int y)
bool	trim (int dstWidth, int dstHeight)

Public Attributes
const void *	fPixels
size_t	fRowBytes
SkImageInfo	fInfo
int	fX
int	fY

Detailed Description

Helper class to package and trim the parameters passed to writePixels()

Definition at line 19 of file SkWritePixelsRec.h.

Constructor & Destructor Documentation

SkWritePixelsRec() [1/2]

SkWritePixelsRec::SkWritePixelsRec ( const SkImageInfo &  info, const void *  pixels, size_t  rowBytes, int  x, int  y  )

inline

Definition at line 20 of file SkWritePixelsRec.h.

        : fPixels(pixels)
        , fRowBytes(rowBytes)
        , fInfo(info)
        , fX(x)
        , fY(y)
    {}

SkWritePixelsRec() [2/2]

SkWritePixelsRec::SkWritePixelsRec ( const SkPixmap &  pm, int  x, int  y  )

inline

Definition at line 28 of file SkWritePixelsRec.h.

        : fPixels(pm.addr())
        , fRowBytes(pm.rowBytes())
        , fInfo(pm.info())
        , fX(x)
        , fY(y)
    {}

Member Function Documentation

trim()

bool SkWritePixelsRec::trim	(	int	dstWidth,
		int	dstHeight
	)

Definition at line 12 of file SkWritePixelsRec.cpp.

                                                       {
    if (nullptr == fPixels || fRowBytes < fInfo.minRowBytes()) {
        return false;
    }
    if (0 >= fInfo.width() || 0 >= fInfo.height()) {
        return false;
    }
 
    int x = fX;
    int y = fY;
    SkIRect dstR = SkIRect::MakeXYWH(x, y, fInfo.width(), fInfo.height());
    if (!dstR.intersect({0, 0, dstWidth, dstHeight})) {
        return false;
    }
 
    // if x or y are negative, then we have to adjust pixels
    if (x > 0) {
        x = 0;
    }
    if (y > 0) {
        y = 0;
    }
    // here x,y are either 0 or negative
    // we negate and add them so UBSAN (pointer-overflow) doesn't get confused.
    fPixels = ((const char*)fPixels + -y*fRowBytes + -x*fInfo.bytesPerPixel());
    // the intersect may have shrunk info's logical size
    fInfo = fInfo.makeDimensions(dstR.size());
    fX = dstR.x();
    fY = dstR.y();
 
    return true;
}

Member Data Documentation

fInfo

SkImageInfo SkWritePixelsRec::fInfo

Definition at line 38 of file SkWritePixelsRec.h.

fPixels

const void* SkWritePixelsRec::fPixels

Definition at line 36 of file SkWritePixelsRec.h.

fRowBytes

size_t SkWritePixelsRec::fRowBytes

Definition at line 37 of file SkWritePixelsRec.h.

fX

int SkWritePixelsRec::fX

Definition at line 39 of file SkWritePixelsRec.h.

fY

int SkWritePixelsRec::fY

Definition at line 40 of file SkWritePixelsRec.h.

---

The documentation for this struct was generated from the following files:

• third_party/skia/src/core/SkWritePixelsRec.h
• third_party/skia/src/core/SkWritePixelsRec.cpp