TessellatingPathBatch(const GrColor& color,
const GrShape& shape,
const SkMatrix& viewMatrix,
const SkRect& clipBounds)
: INHERITED(ClassID())
, fColor(color)
, fShape(shape)
, fViewMatrix(viewMatrix) {
const SkRect& pathBounds = shape.bounds();
fClipBounds = clipBounds;
// Because the clip bounds are used to add a contour for inverse fills, they must also
// include the path bounds.
fClipBounds.join(pathBounds);
const SkRect& srcBounds = shape.inverseFilled() ? fClipBounds : pathBounds;
this->setTransformedBounds(srcBounds, viewMatrix, HasAABloat::kNo, IsZeroArea::kNo);
}
AADistanceFieldPathBatch(GrColor color,
const GrShape& shape,
bool antiAlias,
const SkMatrix& viewMatrix,
GrBatchAtlas* atlas,
ShapeCache* shapeCache, ShapeDataList* shapeList,
bool gammaCorrect)
: INHERITED(ClassID()) {
SkASSERT(shape.hasUnstyledKey());
fBatch.fViewMatrix = viewMatrix;
fGeoData.emplace_back(Geometry{color, shape, antiAlias});
fAtlas = atlas;
fShapeCache = shapeCache;
fShapeList = shapeList;
fGammaCorrect = gammaCorrect;
// Compute bounds
this->setTransformedBounds(shape.bounds(), viewMatrix, HasAABloat::kYes, IsZeroArea::kNo);
}
bool addPathToAtlas(GrVertexBatch::Target* target,
FlushInfo* flushInfo,
GrBatchAtlas* atlas,
ShapeData* shapeData,
const GrShape& shape,
bool antiAlias,
uint32_t dimension,
SkScalar scale) const {
const SkRect& bounds = shape.bounds();
// generate bounding rect for bitmap draw
SkRect scaledBounds = bounds;
// scale to mip level size
scaledBounds.fLeft *= scale;
scaledBounds.fTop *= scale;
scaledBounds.fRight *= scale;
scaledBounds.fBottom *= scale;
// move the origin to an integer boundary (gives better results)
SkScalar dx = SkScalarFraction(scaledBounds.fLeft);
SkScalar dy = SkScalarFraction(scaledBounds.fTop);
scaledBounds.offset(-dx, -dy);
// get integer boundary
SkIRect devPathBounds;
scaledBounds.roundOut(&devPathBounds);
// pad to allow room for antialiasing
const int intPad = SkScalarCeilToInt(kAntiAliasPad);
// pre-move origin (after outset, will be 0,0)
int width = devPathBounds.width();
int height = devPathBounds.height();
devPathBounds.fLeft = intPad;
devPathBounds.fTop = intPad;
devPathBounds.fRight = intPad + width;
devPathBounds.fBottom = intPad + height;
devPathBounds.outset(intPad, intPad);
// draw path to bitmap
SkMatrix drawMatrix;
drawMatrix.setTranslate(-bounds.left(), -bounds.top());
drawMatrix.postScale(scale, scale);
drawMatrix.postTranslate(kAntiAliasPad, kAntiAliasPad);
// setup bitmap backing
SkASSERT(devPathBounds.fLeft == 0);
SkASSERT(devPathBounds.fTop == 0);
SkAutoPixmapStorage dst;
if (!dst.tryAlloc(SkImageInfo::MakeA8(devPathBounds.width(),
devPathBounds.height()))) {
return false;
}
sk_bzero(dst.writable_addr(), dst.getSafeSize());
// rasterize path
SkPaint paint;
paint.setStyle(SkPaint::kFill_Style);
paint.setAntiAlias(antiAlias);
SkDraw draw;
sk_bzero(&draw, sizeof(draw));
SkRasterClip rasterClip;
rasterClip.setRect(devPathBounds);
draw.fRC = &rasterClip;
draw.fMatrix = &drawMatrix;
draw.fDst = dst;
SkPath path;
shape.asPath(&path);
draw.drawPathCoverage(path, paint);
// generate signed distance field
devPathBounds.outset(SK_DistanceFieldPad, SK_DistanceFieldPad);
width = devPathBounds.width();
height = devPathBounds.height();
// TODO We should really generate this directly into the plot somehow
SkAutoSMalloc<1024> dfStorage(width * height * sizeof(unsigned char));
// Generate signed distance field
SkGenerateDistanceFieldFromA8Image((unsigned char*)dfStorage.get(),
(const unsigned char*)dst.addr(),
dst.width(), dst.height(), dst.rowBytes());
// add to atlas
SkIPoint16 atlasLocation;
GrBatchAtlas::AtlasID id;
if (!atlas->addToAtlas(&id, target, width, height, dfStorage.get(), &atlasLocation)) {
this->flush(target, flushInfo);
if (!atlas->addToAtlas(&id, target, width, height, dfStorage.get(), &atlasLocation)) {
return false;
}
}
// add to cache
shapeData->fKey.set(shape, dimension);
shapeData->fScale = scale;
shapeData->fID = id;
// change the scaled rect to match the size of the inset distance field
scaledBounds.fRight = scaledBounds.fLeft +
SkIntToScalar(devPathBounds.width() - 2*SK_DistanceFieldInset);
scaledBounds.fBottom = scaledBounds.fTop +
SkIntToScalar(devPathBounds.height() - 2*SK_DistanceFieldInset);
// shift the origin to the correct place relative to the distance field
// need to also restore the fractional translation
scaledBounds.offset(-SkIntToScalar(SK_DistanceFieldInset) - kAntiAliasPad + dx,
-SkIntToScalar(SK_DistanceFieldInset) - kAntiAliasPad + dy);
shapeData->fBounds = scaledBounds;
// origin we render from is inset from distance field edge
atlasLocation.fX += SK_DistanceFieldInset;
atlasLocation.fY += SK_DistanceFieldInset;
shapeData->fAtlasLocation = atlasLocation;
fShapeCache->add(shapeData);
fShapeList->addToTail(shapeData);
#ifdef DF_PATH_TRACKING
++g_NumCachedPaths;
#endif
return true;
}
