SkLatticeIter Class Reference

#include <SkLatticeIter.h>

Public Member Functions
	SkLatticeIter (const SkCanvas::Lattice &lattice, const SkRect &dst)
	SkLatticeIter (int imageWidth, int imageHeight, const SkIRect &center, const SkRect &dst)
bool	next (SkIRect *src, SkRect *dst, bool *isFixedColor=nullptr, SkColor *fixedColor=nullptr)
bool	next (SkRect *src, SkRect *dst, bool *isFixedColor=nullptr, SkColor *fixedColor=nullptr)
void	mapDstScaleTranslate (const SkMatrix &matrix)
int	numRectsToDraw () const

Static Public Member Functions
static bool	Valid (int imageWidth, int imageHeight, const SkCanvas::Lattice &lattice)
static bool	Valid (int imageWidth, int imageHeight, const SkIRect &center)

Detailed Description

Disect a lattice request into an sequence of src-rect / dst-rect pairs

Definition at line 23 of file SkLatticeIter.h.

Constructor & Destructor Documentation

SkLatticeIter() [1/2]

SkLatticeIter::SkLatticeIter	(	const SkCanvas::Lattice &	lattice,
		const SkRect &	dst
	)

Definition at line 120 of file SkLatticeIter.cpp.

                                                                              {
    const int* xDivs = lattice.fXDivs;
    const int origXCount = lattice.fXCount;
    const int* yDivs = lattice.fYDivs;
    const int origYCount = lattice.fYCount;
    SkASSERT(lattice.fBounds);
    const SkIRect src = *lattice.fBounds;
 
    // In the x-dimension, the first rectangle always starts at x = 0 and is "scalable".
    // If xDiv[0] is 0, it indicates that the first rectangle is degenerate, so the
    // first real rectangle "scalable" in the x-direction.
    //
    // The same interpretation applies to the y-dimension.
    //
    // As we move left to right across the image, alternating patches will be "fixed" or
    // "scalable" in the x-direction.  Similarly, as move top to bottom, alternating
    // patches will be "fixed" or "scalable" in the y-direction.
    int xCount = origXCount;
    int yCount = origYCount;
    bool xIsScalable = (xCount > 0 && src.fLeft == xDivs[0]);
    if (xIsScalable) {
        // Once we've decided that the first patch is "scalable", we don't need the
        // xDiv.  It is always implied that we start at the edge of the bounds.
        xDivs++;
        xCount--;
    }
    bool yIsScalable = (yCount > 0 && src.fTop == yDivs[0]);
    if (yIsScalable) {
        // Once we've decided that the first patch is "scalable", we don't need the
        // yDiv.  It is always implied that we start at the edge of the bounds.
        yDivs++;
        yCount--;
    }
 
    // Count "scalable" and "fixed" pixels in each dimension.
    int xCountScalable = count_scalable_pixels(xDivs, xCount, xIsScalable, src.fLeft, src.fRight);
    int xCountFixed = src.width() - xCountScalable;
    int yCountScalable = count_scalable_pixels(yDivs, yCount, yIsScalable, src.fTop, src.fBottom);
    int yCountFixed = src.height() - yCountScalable;
 
    fSrcX.reset(xCount + 2);
    fDstX.reset(xCount + 2);
    set_points(fDstX.begin(), fSrcX.begin(), xDivs, xCount, xCountFixed, xCountScalable,
               src.fLeft, src.fRight, dst.fLeft, dst.fRight, xIsScalable);
 
    fSrcY.reset(yCount + 2);
    fDstY.reset(yCount + 2);
    set_points(fDstY.begin(), fSrcY.begin(), yDivs, yCount, yCountFixed, yCountScalable,
               src.fTop, src.fBottom, dst.fTop, dst.fBottom, yIsScalable);
 
    fCurrX = fCurrY = 0;
    fNumRectsInLattice = (xCount + 1) * (yCount + 1);
    fNumRectsToDraw = fNumRectsInLattice;
 
    if (lattice.fRectTypes) {
        fRectTypes.push_back_n(fNumRectsInLattice);
        fColors.push_back_n(fNumRectsInLattice);
 
        const SkCanvas::Lattice::RectType* flags = lattice.fRectTypes;
        const SkColor* colors = lattice.fColors;
 
        bool hasPadRow = (yCount != origYCount);
        bool hasPadCol = (xCount != origXCount);
        if (hasPadRow) {
            // The first row of rects are all empty, skip the first row of flags.
            flags += origXCount + 1;
            colors += origXCount + 1;
        }
 
        int i = 0;
        for (int y = 0; y < yCount + 1; y++) {
            for (int x = 0; x < origXCount + 1; x++) {
                if (0 == x && hasPadCol) {
                    // The first column of rects are all empty.  Skip a rect.
                    flags++;
                    colors++;
                    continue;
                }
 
                fRectTypes[i] = *flags;
                fColors[i] = SkCanvas::Lattice::kFixedColor == *flags ? *colors : 0;
                flags++;
                colors++;
                i++;
            }
        }
 
        for (int j = 0; j < fRectTypes.size(); j++) {
            if (SkCanvas::Lattice::kTransparent == fRectTypes[j]) {
                fNumRectsToDraw--;
            }
        }
    }
}

SkLatticeIter() [2/2]

SkLatticeIter::SkLatticeIter	(	int	imageWidth,
		int	imageHeight,
		const SkIRect &	center,
		const SkRect &	dst
	)

Definition at line 219 of file SkLatticeIter.cpp.

                                                                              {
    SkASSERT(SkIRect::MakeWH(w, h).contains(c));
 
    fSrcX.reset(4);
    fSrcY.reset(4);
    fDstX.reset(4);
    fDstY.reset(4);
 
    fSrcX[0] = 0;
    fSrcX[1] = SkIntToScalar(c.fLeft);
    fSrcX[2] = SkIntToScalar(c.fRight);
    fSrcX[3] = SkIntToScalar(w);
 
    fSrcY[0] = 0;
    fSrcY[1] = SkIntToScalar(c.fTop);
    fSrcY[2] = SkIntToScalar(c.fBottom);
    fSrcY[3] = SkIntToScalar(h);
 
    fDstX[0] = dst.fLeft;
    fDstX[1] = dst.fLeft + SkIntToScalar(c.fLeft);
    fDstX[2] = dst.fRight - SkIntToScalar(w - c.fRight);
    fDstX[3] = dst.fRight;
 
    fDstY[0] = dst.fTop;
    fDstY[1] = dst.fTop + SkIntToScalar(c.fTop);
    fDstY[2] = dst.fBottom - SkIntToScalar(h - c.fBottom);
    fDstY[3] = dst.fBottom;
 
    if (fDstX[1] > fDstX[2]) {
        fDstX[1] = fDstX[0] + (fDstX[3] - fDstX[0]) * c.fLeft / (w - c.width());
        fDstX[2] = fDstX[1];
    }
 
    if (fDstY[1] > fDstY[2]) {
        fDstY[1] = fDstY[0] + (fDstY[3] - fDstY[0]) * c.fTop / (h - c.height());
        fDstY[2] = fDstY[1];
    }
 
    fCurrX = fCurrY = 0;
    fNumRectsInLattice = 9;
    fNumRectsToDraw = 9;
}

Member Function Documentation

mapDstScaleTranslate()

void SkLatticeIter::mapDstScaleTranslate

(

const SkMatrix &

matrix

)

Apply a matrix to the dst points.

Definition at line 294 of file SkLatticeIter.cpp.

                                                               {
    SkASSERT(matrix.isScaleTranslate());
    SkScalar tx = matrix.getTranslateX();
    SkScalar sx = matrix.getScaleX();
    for (int i = 0; i < fDstX.size(); i++) {
        fDstX[i] = fDstX[i] * sx + tx;
    }
 
    SkScalar ty = matrix.getTranslateY();
    SkScalar sy = matrix.getScaleY();
    for (int i = 0; i < fDstY.size(); i++) {
        fDstY[i] = fDstY[i] * sy + ty;
    }
}

next() [1/2]

bool SkLatticeIter::next	(	SkIRect *	src,
		SkRect *	dst,
		bool *	isFixedColor = nullptr,
		SkColor *	fixedColor = nullptr
	)

While it returns true, use src/dst to draw the image/bitmap. Optional parameters isFixedColor and fixedColor specify if the rectangle is filled with a fixed color. If (*isFixedColor) is true, then (*fixedColor) contains the rectangle color.

Definition at line 262 of file SkLatticeIter.cpp.

                                                                                           {
    int currRect = fCurrX + fCurrY * (fSrcX.size() - 1);
    if (currRect == fNumRectsInLattice) {
        return false;
    }
 
    const int x = fCurrX;
    const int y = fCurrY;
    SkASSERT(x >= 0 && x < fSrcX.size() - 1);
    SkASSERT(y >= 0 && y < fSrcY.size() - 1);
 
    if (fSrcX.size() - 1 == ++fCurrX) {
        fCurrX = 0;
        fCurrY += 1;
    }
 
    if (!fRectTypes.empty() && SkToBool(SkCanvas::Lattice::kTransparent == fRectTypes[currRect])) {
        return this->next(src, dst, isFixedColor, fixedColor);
    }
 
    src->setLTRB(fSrcX[x], fSrcY[y], fSrcX[x + 1], fSrcY[y + 1]);
    dst->setLTRB(fDstX[x], fDstY[y], fDstX[x + 1], fDstY[y + 1]);
    if (isFixedColor && fixedColor) {
        *isFixedColor = !fRectTypes.empty() &&
                        SkToBool(SkCanvas::Lattice::kFixedColor == fRectTypes[currRect]);
        if (*isFixedColor) {
            *fixedColor = fColors[currRect];
        }
    }
    return true;
}

next() [2/2]

bool SkLatticeIter::next ( SkRect *  src, SkRect *  dst, bool *  isFixedColor = nullptr, SkColor *  fixedColor = nullptr  )

inline

Version of above that converts the integer src rect to a scalar rect.

Definition at line 43 of file SkLatticeIter.h.

                                             {
        SkIRect isrcR;
        if (this->next(&isrcR, dst, isFixedColor, fixedColor)) {
            *src = SkRect::Make(isrcR);
            return true;
        }
        return false;
    }

numRectsToDraw()

int SkLatticeIter::numRectsToDraw ( ) const

inline

Returns the number of rects that will actually be drawn.

Definition at line 61 of file SkLatticeIter.h.

                               {
        return fNumRectsToDraw;
    }

Valid() [1/2]

bool SkLatticeIter::Valid ( int  imageWidth, int  imageHeight, const SkCanvas::Lattice &  lattice  )

static

Definition at line 32 of file SkLatticeIter.cpp.

                                                                               {
    SkIRect totalBounds = SkIRect::MakeWH(width, height);
    SkASSERT(lattice.fBounds);
    const SkIRect latticeBounds = *lattice.fBounds;
    if (!totalBounds.contains(latticeBounds)) {
        return false;
    }
 
    bool zeroXDivs = lattice.fXCount <= 0 || (1 == lattice.fXCount &&
                                              latticeBounds.fLeft == lattice.fXDivs[0]);
    bool zeroYDivs = lattice.fYCount <= 0 || (1 == lattice.fYCount &&
                                              latticeBounds.fTop == lattice.fYDivs[0]);
    if (zeroXDivs && zeroYDivs) {
        return false;
    }
 
    return valid_divs(lattice.fXDivs, lattice.fXCount, latticeBounds.fLeft, latticeBounds.fRight)
        && valid_divs(lattice.fYDivs, lattice.fYCount, latticeBounds.fTop, latticeBounds.fBottom);
}

Valid() [2/2]

bool SkLatticeIter::Valid ( int  imageWidth, int  imageHeight, const SkIRect &  center  )

static

Definition at line 215 of file SkLatticeIter.cpp.

                                                                      {
    return !center.isEmpty() && SkIRect::MakeWH(width, height).contains(center);
}

---

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

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