SkReadPixelsRec Struct Reference

#include <SkReadPixelsRec.h>

Public Member Functions
	SkReadPixelsRec (const SkImageInfo &info, void *pixels, size_t rowBytes, int x, int y)
	SkReadPixelsRec (const SkPixmap &pm, int x, int y)
bool	trim (int srcWidth, int srcHeight)

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

Detailed Description

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

Definition at line 19 of file SkReadPixelsRec.h.

Constructor & Destructor Documentation

SkReadPixelsRec() [1/2]

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

inline

Definition at line 20 of file SkReadPixelsRec.h.

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

SkReadPixelsRec() [2/2]

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

inline

Definition at line 28 of file SkReadPixelsRec.h.

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

Member Function Documentation

trim()

bool SkReadPixelsRec::trim	(	int	srcWidth,
		int	srcHeight
	)

Definition at line 11 of file SkReadPixelsRec.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 srcR = SkIRect::MakeXYWH(x, y, fInfo.width(), fInfo.height());
    if (!srcR.intersect({0, 0, srcWidth, srcHeight})) {
        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 = ((char*)fPixels + -y*fRowBytes + -x*fInfo.bytesPerPixel());
    // the intersect may have shrunk info's logical size
    fInfo = fInfo.makeDimensions(srcR.size());
    fX = srcR.x();
    fY = srcR.y();
 
    return true;
}

Member Data Documentation

fInfo

SkImageInfo SkReadPixelsRec::fInfo

Definition at line 38 of file SkReadPixelsRec.h.

fPixels

void* SkReadPixelsRec::fPixels

Definition at line 36 of file SkReadPixelsRec.h.

fRowBytes

size_t SkReadPixelsRec::fRowBytes

Definition at line 37 of file SkReadPixelsRec.h.

fX

int SkReadPixelsRec::fX

Definition at line 39 of file SkReadPixelsRec.h.

fY

int SkReadPixelsRec::fY

Definition at line 40 of file SkReadPixelsRec.h.

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

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