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Fix SDF generation for pixel-aligned paths

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BUG=668550

Change-Id: Ib496db82c7391aca61b31afaeb5445260170cc49
Reviewed-on: https://skia-review.googlesource.com/5549
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
This commit is contained in:
Jim Van Verth 2016-12-07 10:40:09 -05:00 committed by Skia Commit-Bot
parent d7e16661bb
commit 92964124c5
3 changed files with 80 additions and 49 deletions
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39
gm/pathfill.cpp
View File

@ -50,15 +50,15 @@ static SkScalar make_oval(SkPath* path) {
return SkIntToScalar(30);
}
static SkScalar make_sawtooth(SkPath* path) {
static SkScalar make_sawtooth(SkPath* path, int teeth) {
SkScalar x = SkIntToScalar(20);
SkScalar y = SkIntToScalar(20);
const SkScalar x0 = x;
const SkScalar dx = SK_Scalar1 * 5;
const SkScalar dy = SK_Scalar1 * 10;
const SkScalar dx = SkIntToScalar(5);
const SkScalar dy = SkIntToScalar(10);
path->moveTo(x, y);
for (int i = 0; i < 32; i++) {
for (int i = 0; i < teeth; i++) {
x += dx;
path->lineTo(x, y - dy);
x += dx;
@ -70,6 +70,33 @@ static SkScalar make_sawtooth(SkPath* path) {
return SkIntToScalar(30);
}
static SkScalar make_sawtooth_3(SkPath* path) { return make_sawtooth(path, 3); }
static SkScalar make_sawtooth_32(SkPath* path) { return make_sawtooth(path, 32); }
static SkScalar make_house(SkPath* path) {
path->moveTo(21, 23);
path->lineTo(21, 11.534f);
path->lineTo(22.327f, 12.741f);
path->lineTo(23.673f, 11.261f);
path->lineTo(12, 0.648f);
path->lineTo(8, 4.285f);
path->lineTo(8, 2);
path->lineTo(4, 2);
path->lineTo(4, 7.921f);
path->lineTo(0.327f, 11.26f);
path->lineTo(1.673f, 12.74f);
path->lineTo(3, 11.534f);
path->lineTo(3, 23);
path->lineTo(11, 23);
path->lineTo(11, 18);
path->lineTo(13, 18);
path->lineTo(13, 23);
path->lineTo(21, 23);
path->close();
path->offset(20, 0);
return SkIntToScalar(30);
}
static SkScalar make_star(SkPath* path, int n) {
const SkScalar c = SkIntToScalar(45);
const SkScalar r = SkIntToScalar(20);
@ -107,10 +134,12 @@ constexpr MakePathProc gProcs[] = {
make_triangle,
make_rect,
make_oval,
make_sawtooth,
make_sawtooth_32,
make_star_5,
make_star_13,
make_line,
make_house,
make_sawtooth_3,
};
#define N SK_ARRAY_COUNT(gProcs)

86
src/gpu/batches/GrAADistanceFieldPathRenderer.cpp
View File

@ -248,9 +248,16 @@ private:
const SkRect& bounds = args.fShape.bounds();
SkScalar maxDim = SkMaxScalar(bounds.width(), bounds.height());
SkScalar size = maxScale * maxDim;
uint32_t desiredDimension;
if (size <= kSmallMIP) {
SkScalar desiredDimension;
// For minimizing (or the common case of identity) transforms, we try to
// create the DF at the appropriately sized native src-space path resolution.
// In the majority of cases this will yield a crisper rendering.
if (size <= maxDim && maxDim < kSmallMIP) {
desiredDimension = maxDim;
} else if (size <= kSmallMIP) {
desiredDimension = kSmallMIP;
} else if (size <= maxDim) {
desiredDimension = maxDim;
} else if (size <= kMediumMIP) {
desiredDimension = kMediumMIP;
} else {
@ -258,7 +265,7 @@ private:
}
// check to see if path is cached
ShapeData::Key key(args.fShape, desiredDimension);
ShapeData::Key key(args.fShape, SkScalarCeilToInt(desiredDimension));
ShapeData* shapeData = fShapeCache->find(key);
if (nullptr == shapeData || !atlas->hasID(shapeData->fID)) {
// Remove the stale cache entry
@ -268,6 +275,7 @@ private:
delete shapeData;
}
SkScalar scale = desiredDimension/maxDim;
shapeData = new ShapeData;
if (!this->addPathToAtlas(target,
&flushInfo,
@ -275,7 +283,7 @@ private:
shapeData,
args.fShape,
args.fAntiAlias,
desiredDimension,
SkScalarCeilToInt(desiredDimension),
scale)) {
delete shapeData;
SkDebugf("Can't rasterize path\n");
@ -311,29 +319,25 @@ private:
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);
// subtract out integer portion of origin
// (SDF created will be placed with fractional offset burnt in)
SkScalar dx = SkScalarFloorToInt(scaledBounds.fLeft);
SkScalar dy = SkScalarFloorToInt(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);
// place devBounds at origin
int width = devPathBounds.width() + 2*intPad;
int height = devPathBounds.height() + 2*intPad;
devPathBounds = SkIRect::MakeWH(width, height);
// draw path to bitmap
SkMatrix drawMatrix;
drawMatrix.setTranslate(-bounds.left(), -bounds.top());
drawMatrix.postScale(scale, scale);
drawMatrix.postTranslate(kAntiAliasPad, kAntiAliasPad);
drawMatrix.setScale(scale, scale);
drawMatrix.postTranslate(intPad - dx, intPad - dy);
// setup bitmap backing
SkASSERT(devPathBounds.fLeft == 0);
@ -378,7 +382,7 @@ private:
// add to atlas
SkIPoint16 atlasLocation;
GrBatchAtlas::AtlasID id;
if (!atlas->addToAtlas(&id, target, width, height, dfStorage.get(), &atlasLocation)) {
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;
@ -387,22 +391,20 @@ private:
// 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;
// set the bounds rect to match the size and placement of the distance field in the atlas
shapeData->fBounds.setXYWH(atlasLocation.fX + SK_DistanceFieldPad,
atlasLocation.fY + SK_DistanceFieldPad,
width - 2*SK_DistanceFieldPad,
height - 2*SK_DistanceFieldPad);
// we also need to store the transformation from texture space to the original path's space
// which is a simple uniform scale and translate
shapeData->fScaleToDev = SkScalarInvert(scale);
dx -= SK_DistanceFieldPad + kAntiAliasPad;
dy -= SK_DistanceFieldPad + kAntiAliasPad;
shapeData->fTranslateToDev = SkPoint::Make((-atlasLocation.fX + dx)*shapeData->fScaleToDev,
(-atlasLocation.fY + dy)*shapeData->fScaleToDev);
fShapeCache->add(shapeData);
fShapeList->addToTail(shapeData);
@ -426,11 +428,14 @@ private:
SkScalar width = shapeData->fBounds.width();
SkScalar height = shapeData->fBounds.height();
SkScalar invScale = 1.0f / shapeData->fScale;
// transform texture bounds to the original path's space
SkScalar invScale = shapeData->fScaleToDev;
dx *= invScale;
dy *= invScale;
width *= invScale;
height *= invScale;
dx += shapeData->fTranslateToDev.fX;
dy += shapeData->fTranslateToDev.fY;
SkPoint* positions = reinterpret_cast<SkPoint*>(offset);
@ -445,15 +450,12 @@ private:
*colorPtr = color;
}
const SkScalar tx = SkIntToScalar(shapeData->fAtlasLocation.fX);
const SkScalar ty = SkIntToScalar(shapeData->fAtlasLocation.fY);
// vertex texture coords
SkPoint* textureCoords = (SkPoint*)(offset + sizeof(SkPoint) + sizeof(GrColor));
textureCoords->setRectFan(tx / texture->width(),
ty / texture->height(),
(tx + shapeData->fBounds.width()) / texture->width(),
(ty + shapeData->fBounds.height()) / texture->height(),
textureCoords->setRectFan((shapeData->fBounds.fLeft) / texture->width(),
(shapeData->fBounds.fTop) / texture->height(),
(shapeData->fBounds.fRight)/texture->width(),
(shapeData->fBounds.fBottom)/texture->height(),
vertexStride);
}

4
src/gpu/batches/GrAADistanceFieldPathRenderer.h
View File

@ -70,10 +70,10 @@ private:
SkAutoSTArray<24, uint32_t> fKey;
};
Key fKey;
SkScalar fScale;
GrBatchAtlas::AtlasID fID;
SkRect fBounds;
SkIPoint16 fAtlasLocation;
SkScalar fScaleToDev;
SkPoint fTranslateToDev;
SK_DECLARE_INTERNAL_LLIST_INTERFACE(ShapeData);
static inline const Key& GetKey(const ShapeData& data) {