bool GrAndroidPathRenderer::canDrawPath(const SkPath& path,
const SkStrokeRec& stroke,
const GrDrawTarget* target,
bool antiAlias) const {
return ((stroke.isFillStyle() || stroke.getStyle() == SkStrokeRec::kStroke_Style)
&& !path.isInverseFillType() && path.isConvex());
}
bool GrStrokePathRenderer::canDrawPath(const SkPath& path,
const SkStrokeRec& stroke,
const GrDrawTarget* target,
bool antiAlias) const {
// FIXME : put the proper condition once GrDrawTarget::isOpaque is implemented
const bool isOpaque = true; // target->isOpaque();
// FIXME : remove this requirement once we have AA circles and implement the
// circle joins/caps appropriately in the ::onDrawPath() function.
const bool requiresAACircle = (stroke.getCap() == SkPaint::kRound_Cap) ||
(stroke.getJoin() == SkPaint::kRound_Join);
// Indices being stored in uint16, we don't want to overflow the indices capacity
static const int maxVBSize = 1 << 16;
const int maxNbVerts = (path.countPoints() + 1) * 5;
// Check that the path contains no curved lines, only straight lines
static const uint32_t unsupportedMask = SkPath::kQuad_SegmentMask | SkPath::kCubic_SegmentMask;
// Must not be filled nor hairline nor semi-transparent
// Note : May require a check to path.isConvex() if AA is supported
return ((stroke.getStyle() == SkStrokeRec::kStroke_Style) && (maxNbVerts < maxVBSize) &&
!path.isInverseFillType() && isOpaque && !requiresAACircle && !antiAlias &&
((path.getSegmentMasks() & unsupportedMask) == 0));
}
/**
* Draw a single path element of the clip stack into the accumulation bitmap
*/
void GrSWMaskHelper::draw(const SkPath& path, const SkStrokeRec& stroke, SkRegion::Op op,
bool antiAlias, uint8_t alpha) {
SkPaint paint;
if (stroke.isHairlineStyle()) {
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SK_Scalar1);
} else {
if (stroke.isFillStyle()) {
paint.setStyle(SkPaint::kFill_Style);
} else {
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeJoin(stroke.getJoin());
paint.setStrokeCap(stroke.getCap());
paint.setStrokeWidth(stroke.getWidth());
}
}
SkXfermode* mode = SkXfermode::Create(op_to_mode(op));
paint.setXfermode(mode);
paint.setAntiAlias(antiAlias);
paint.setColor(SkColorSetARGB(alpha, alpha, alpha, alpha));
fDraw.drawPath(path, paint);
SkSafeUnref(mode);
}
/**
* Draw a single path element of the clip stack into the accumulation bitmap
*/
void GrSWMaskHelper::draw(const SkPath& path, const SkStrokeRec& stroke, SkRegion::Op op,
bool antiAlias, uint8_t alpha) {
SkPaint paint;
if (stroke.isHairlineStyle()) {
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SK_Scalar1);
} else {
if (stroke.isFillStyle()) {
paint.setStyle(SkPaint::kFill_Style);
} else {
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeJoin(stroke.getJoin());
paint.setStrokeCap(stroke.getCap());
paint.setStrokeWidth(stroke.getWidth());
}
}
paint.setAntiAlias(antiAlias);
if (SkRegion::kReplace_Op == op && 0xFF == alpha) {
SkASSERT(0xFF == paint.getAlpha());
fDraw.drawPathCoverage(path, paint);
} else {
paint.setXfermodeMode(op_to_mode(op));
paint.setColor(SkColorSetARGB(alpha, alpha, alpha, alpha));
fDraw.drawPath(path, paint);
}
}
inline static bool is_miter(const SkStrokeRec& stroke) {
// For hairlines, make bevel and round joins appear the same as mitered ones.
// small miter limit means right angles show bevel...
if ((stroke.getWidth() > 0) && (stroke.getJoin() != SkPaint::kMiter_Join ||
stroke.getMiter() < SK_ScalarSqrt2)) {
return false;
}
return true;
}
static void outset_for_stroke(SkRect* rect, const SkStrokeRec& rec) {
SkScalar radius = SkScalarHalf(rec.getWidth());
if (0 == radius) {
radius = SK_Scalar1; // hairlines
}
if (SkPaint::kMiter_Join == rec.getJoin()) {
radius = SkScalarMul(radius, rec.getMiter());
}
rect->outset(radius, radius);
}
bool GrStyle::applyPathEffectToPath(SkPath *dst, SkStrokeRec *remainingStroke,
const SkPath &src, SkScalar resScale) const {
SkASSERT(dst);
SkStrokeRec strokeRec = fStrokeRec;
strokeRec.setResScale(resScale);
if (!apply_path_effect(dst, &strokeRec, fPathEffect, src)) {
return false;
}
*remainingStroke = strokeRec;
return true;
}
static std::unique_ptr<GrLegacyMeshDrawOp> Make(GrColor color, const SkMatrix& viewMatrix,
const SkRect& rect, const SkStrokeRec& stroke,
bool snapToPixelCenters) {
if (!allowed_stroke(stroke)) {
return nullptr;
}
NonAAStrokeRectOp* op = new NonAAStrokeRectOp();
op->fColor = color;
op->fViewMatrix = viewMatrix;
op->fRect = rect;
// Sort the rect for hairlines
op->fRect.sort();
op->fStrokeWidth = stroke.getWidth();
SkScalar rad = SkScalarHalf(op->fStrokeWidth);
SkRect bounds = rect;
bounds.outset(rad, rad);
// If our caller snaps to pixel centers then we have to round out the bounds
if (snapToPixelCenters) {
viewMatrix.mapRect(&bounds);
// We want to be consistent with how we snap non-aa lines. To match what we do in
// GrGLSLVertexShaderBuilder, we first floor all the vertex values and then add half a
// pixel to force us to pixel centers.
bounds.set(SkScalarFloorToScalar(bounds.fLeft),
SkScalarFloorToScalar(bounds.fTop),
SkScalarFloorToScalar(bounds.fRight),
SkScalarFloorToScalar(bounds.fBottom));
bounds.offset(0.5f, 0.5f);
op->setBounds(bounds, HasAABloat::kNo, IsZeroArea::kNo);
} else {
op->setTransformedBounds(bounds, op->fViewMatrix, HasAABloat::kNo, IsZeroArea::kNo);
}
return std::unique_ptr<GrLegacyMeshDrawOp>(op);
}
void GrDrawTarget::stencilPath(const GrPath* path, const SkStrokeRec& stroke, SkPath::FillType fill) {
// TODO: extract portions of checkDraw that are relevant to path stenciling.
GrAssert(NULL != path);
GrAssert(fCaps.pathStencilingSupport());
GrAssert(!stroke.isHairlineStyle());
GrAssert(!SkPath::IsInverseFillType(fill));
this->onStencilPath(path, stroke, fill);
}
bool GrStencilAndCoverPathRenderer::canDrawPath(const SkPath& path,
const SkStrokeRec& stroke,
const GrDrawTarget* target,
bool antiAlias) const {
return stroke.isFillStyle() &&
!antiAlias && // doesn't do per-path AA, relies on the target having MSAA
target->getDrawState().getStencil().isDisabled();
}
bool GrStyle::applyToPath(SkPath* dst, SkStrokeRec::InitStyle* style, const SkPath& src,
SkScalar resScale) const {
SkASSERT(style);
SkASSERT(dst);
SkStrokeRec strokeRec = fStrokeRec;
strokeRec.setResScale(resScale);
const SkPath* pathForStrokeRec = &src;
if (apply_path_effect(dst, &strokeRec, fPathEffect, src)) {
pathForStrokeRec = dst;
} else if (fPathEffect) {
return false;
}
if (strokeRec.needToApply()) {
if (!strokeRec.applyToPath(dst, *pathForStrokeRec)) {
return false;
}
*style = SkStrokeRec::kFill_InitStyle;
} else if (!fPathEffect) {
// Nothing to do for path effect or stroke, fail.
return false;
} else {
SkASSERT(SkStrokeRec::kFill_Style == strokeRec.getStyle() ||
SkStrokeRec::kHairline_Style == strokeRec.getStyle());
*style = strokeRec.getStyle() == SkStrokeRec::kFill_Style
? SkStrokeRec::kFill_InitStyle
: SkStrokeRec::kHairline_InitStyle;
}
return true;
}
bool GrAAConvexPathRenderer::canDrawPath(const GrDrawTarget* target,
const GrPipelineBuilder*,
const SkMatrix& viewMatrix,
const SkPath& path,
const SkStrokeRec& stroke,
bool antiAlias) const {
return (target->caps()->shaderDerivativeSupport() && antiAlias &&
stroke.isFillStyle() && !path.isInverseFillType() && path.isConvex());
}
bool GrDefaultPathRenderer::canDrawPath(const SkPath& path,
const SkStrokeRec& stroke,
const GrDrawTarget* target,
bool antiAlias) const {
// this class can draw any path with any fill but doesn't do any anti-aliasing.
return !antiAlias && !(SkPath::kConic_SegmentMask & path.getSegmentMasks()) &&
(stroke.isFillStyle() ||
IsStrokeHairlineOrEquivalent(stroke, target->getDrawState().getViewMatrix(), NULL));
}
Geometry(const SkStrokeRec& stroke) : fStroke(stroke) {
if (!stroke.needToApply()) {
// purify unused values to ensure binary equality
fStroke.setStrokeParams(SkPaint::kDefault_Cap, SkPaint::kDefault_Join,
SkIntToScalar(4));
if (fStroke.getWidth() < 0) {
fStroke.setStrokeStyle(-1.0f);
}
}
}
static inline bool single_pass_path(const SkPath& path, const SkStrokeRec& stroke) {
#if STENCIL_OFF
return true;
#else
if (!stroke.isHairlineStyle() && !path.isInverseFillType()) {
return path.isConvex();
}
return false;
#endif
}
uint64_t GrPath::ComputeStrokeKey(const SkStrokeRec& stroke) {
enum {
kStyleBits = 2,
kJoinBits = 2,
kCapBits = 2,
kWidthBits = 29,
kMiterBits = 29,
kJoinShift = kStyleBits,
kCapShift = kJoinShift + kJoinBits,
kWidthShift = kCapShift + kCapBits,
kMiterShift = kWidthShift + kWidthBits,
kBitCount = kMiterShift + kMiterBits
};
SK_COMPILE_ASSERT(SkStrokeRec::kStyleCount <= (1 << kStyleBits), style_shift_will_be_wrong);
SK_COMPILE_ASSERT(SkPaint::kJoinCount <= (1 << kJoinBits), cap_shift_will_be_wrong);
SK_COMPILE_ASSERT(SkPaint::kCapCount <= (1 << kCapBits), miter_shift_will_be_wrong);
SK_COMPILE_ASSERT(kBitCount == 64, wrong_stroke_key_size);
if (!stroke.needToApply()) {
return SkStrokeRec::kFill_Style;
}
uint64_t key = stroke.getStyle();
key |= stroke.getJoin() << kJoinShift;
key |= stroke.getCap() << kCapShift;
key |= get_top_n_float_bits<kWidthBits>(stroke.getWidth()) << kWidthShift;
key |= get_top_n_float_bits<kMiterBits>(stroke.getMiter()) << kMiterShift;
return key;
}
/**
* Draw a single path element of the clip stack into the accumulation bitmap
*/
void GrSWMaskHelper::draw(const SkPath& path, const SkStrokeRec& stroke, SkRegion::Op op,
bool antiAlias, uint8_t alpha) {
SkPaint paint;
if (stroke.isHairlineStyle()) {
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SK_Scalar1);
} else {
if (stroke.isFillStyle()) {
paint.setStyle(SkPaint::kFill_Style);
} else {
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeJoin(stroke.getJoin());
paint.setStrokeCap(stroke.getCap());
paint.setStrokeWidth(stroke.getWidth());
}
}
paint.setAntiAlias(antiAlias);
SkTBlitterAllocator allocator;
SkBlitter* blitter = nullptr;
if (kBlitter_CompressionMode == fCompressionMode) {
SkASSERT(fCompressedBuffer.get());
blitter = SkTextureCompressor::CreateBlitterForFormat(
fPixels.width(), fPixels.height(), fCompressedBuffer.get(), &allocator,
fCompressedFormat);
}
if (SkRegion::kReplace_Op == op && 0xFF == alpha) {
SkASSERT(0xFF == paint.getAlpha());
fDraw.drawPathCoverage(path, paint, blitter);
} else {
paint.setXfermodeMode(op_to_mode(op));
paint.setColor(SkColorSetARGB(alpha, alpha, alpha, alpha));
fDraw.drawPath(path, paint, blitter);
}
}
bool GrAAHairLinePathRenderer::canDrawPath(const SkPath& path,
const SkStrokeRec& stroke,
const GrDrawTarget* target,
bool antiAlias) const {
if (!stroke.isHairlineStyle() || !antiAlias) {
return false;
}
static const uint32_t gReqDerivMask = SkPath::kCubic_SegmentMask |
SkPath::kQuad_SegmentMask;
if (!target->getCaps().shaderDerivativeSupport() &&
(gReqDerivMask & path.getSegmentMasks())) {
return false;
}
return true;
}
bool Append(GrBatch* origBatch,
GrColor color,
const SkMatrix& viewMatrix,
const SkRect& rect,
const SkStrokeRec& stroke) {
AAStrokeRectBatch* batch = origBatch->cast<AAStrokeRectBatch>();
// we can't batch across vm changes
bool isMiterStroke = is_miter(stroke);
if (!batch->canAppend(viewMatrix, isMiterStroke)) {
return false;
}
SkRect devOutside, devOutsideAssist, devInside;
bool isDegenerate;
compute_rects(&devOutside, &devOutsideAssist, &devInside, &isDegenerate, viewMatrix,
rect, stroke.getWidth(), isMiterStroke);
batch->appendAndUpdateBounds(color, devOutside, devOutsideAssist, devInside, isDegenerate);
return true;
}
void GrStencilAndCoverTextContext::init(const GrPaint& paint,
const SkPaint& skPaint,
size_t textByteLength,
RenderMode renderMode,
SkScalar textTranslateY) {
GrTextContext::init(paint, skPaint);
fContextInitialMatrix = fContext->getMatrix();
const bool otherBackendsWillDrawAsPaths =
SkDraw::ShouldDrawTextAsPaths(skPaint, fContextInitialMatrix);
fNeedsDeviceSpaceGlyphs = !otherBackendsWillDrawAsPaths &&
kMaxAccuracy_RenderMode == renderMode &&
SkToBool(fContextInitialMatrix.getType() &
(SkMatrix::kScale_Mask | SkMatrix::kAffine_Mask));
if (fNeedsDeviceSpaceGlyphs) {
// SkDraw::ShouldDrawTextAsPaths takes care of perspective transforms.
SkASSERT(!fContextInitialMatrix.hasPerspective());
SkASSERT(0 == textTranslateY); // TODO: Handle textTranslateY in device-space usecase.
fTextRatio = fTextInverseRatio = 1.0f;
// Glyphs loaded by GPU path rendering have an inverted y-direction.
SkMatrix m;
m.setScale(1, -1);
fContext->setMatrix(m);
// Post-flip the initial matrix so we're left with just the flip after
// the paint preConcats the inverse.
m = fContextInitialMatrix;
m.postScale(1, -1);
fPaint.localCoordChangeInverse(m);
// The whole shape (including stroke) will be baked into the glyph outlines. Make
// NVPR just fill the baked shapes.
fGlyphCache = fSkPaint.detachCache(&fDeviceProperties, &fContextInitialMatrix, false);
fGlyphs = get_gr_glyphs(fContext, fGlyphCache->getScalerContext()->getTypeface(),
&fGlyphCache->getDescriptor(),
SkStrokeRec(SkStrokeRec::kFill_InitStyle));
} else {
// Don't bake strokes into the glyph outlines. We will stroke the glyphs
// using the GPU instead. This is the fast path.
SkStrokeRec gpuStroke = SkStrokeRec(fSkPaint);
fSkPaint.setStyle(SkPaint::kFill_Style);
if (gpuStroke.isHairlineStyle()) {
// Approximate hairline stroke.
SkScalar strokeWidth = SK_Scalar1 /
(SkVector::Make(fContextInitialMatrix.getScaleX(),
fContextInitialMatrix.getSkewY()).length());
gpuStroke.setStrokeStyle(strokeWidth, false /*strokeAndFill*/);
} else if (fSkPaint.isFakeBoldText() &&
#ifdef SK_USE_FREETYPE_EMBOLDEN
kMaxPerformance_RenderMode == renderMode &&
#endif
SkStrokeRec::kStroke_Style != gpuStroke.getStyle()) {
// Instead of baking fake bold into the glyph outlines, do it with the GPU stroke.
SkScalar fakeBoldScale = SkScalarInterpFunc(fSkPaint.getTextSize(),
kStdFakeBoldInterpKeys,
kStdFakeBoldInterpValues,
kStdFakeBoldInterpLength);
SkScalar extra = SkScalarMul(fSkPaint.getTextSize(), fakeBoldScale);
gpuStroke.setStrokeStyle(gpuStroke.needToApply() ? gpuStroke.getWidth() + extra : extra,
true /*strokeAndFill*/);
fSkPaint.setFakeBoldText(false);
}
bool canUseRawPaths;
if (otherBackendsWillDrawAsPaths || kMaxPerformance_RenderMode == renderMode) {
// We can draw the glyphs from canonically sized paths.
fTextRatio = fSkPaint.getTextSize() / SkPaint::kCanonicalTextSizeForPaths;
fTextInverseRatio = SkPaint::kCanonicalTextSizeForPaths / fSkPaint.getTextSize();
// Compensate for the glyphs being scaled by fTextRatio.
if (!gpuStroke.isFillStyle()) {
gpuStroke.setStrokeStyle(gpuStroke.getWidth() / fTextRatio,
SkStrokeRec::kStrokeAndFill_Style == gpuStroke.getStyle());
}
fSkPaint.setLinearText(true);
fSkPaint.setLCDRenderText(false);
fSkPaint.setAutohinted(false);
fSkPaint.setHinting(SkPaint::kNo_Hinting);
fSkPaint.setSubpixelText(true);
fSkPaint.setTextSize(SkIntToScalar(SkPaint::kCanonicalTextSizeForPaths));
canUseRawPaths = SK_Scalar1 == fSkPaint.getTextScaleX() &&
0 == fSkPaint.getTextSkewX() &&
!fSkPaint.isFakeBoldText() &&
!fSkPaint.isVerticalText();
} else {
fTextRatio = fTextInverseRatio = 1.0f;
canUseRawPaths = false;
}
SkMatrix textMatrix;
textMatrix.setTranslate(0, textTranslateY);
// Glyphs loaded by GPU path rendering have an inverted y-direction.
textMatrix.preScale(fTextRatio, -fTextRatio);
fPaint.localCoordChange(textMatrix);
fContext->concatMatrix(textMatrix);
fGlyphCache = fSkPaint.detachCache(&fDeviceProperties, NULL, false);
fGlyphs = canUseRawPaths ?
get_gr_glyphs(fContext, fSkPaint.getTypeface(), NULL, gpuStroke) :
get_gr_glyphs(fContext, fGlyphCache->getScalerContext()->getTypeface(),
&fGlyphCache->getDescriptor(), gpuStroke);
}
fStateRestore.set(fDrawTarget->drawState());
fDrawTarget->drawState()->setFromPaint(fPaint, fContext->getMatrix(),
fContext->getRenderTarget());
GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
kZero_StencilOp,
kZero_StencilOp,
kNotEqual_StencilFunc,
0xffff,
0x0000,
0xffff);
*fDrawTarget->drawState()->stencil() = kStencilPass;
SkASSERT(0 == fPendingGlyphCount);
}
// Currently asPoints is more restrictive then it needs to be. In the future
// we need to:
// allow kRound_Cap capping (could allow rotations in the matrix with this)
// allow paths to be returned
bool SkDashPathEffect::asPoints(PointData* results,
const SkPath& src,
const SkStrokeRec& rec,
const SkMatrix& matrix,
const SkRect* cullRect) const {
// width < 0 -> fill && width == 0 -> hairline so requiring width > 0 rules both out
if (fInitialDashLength < 0 || 0 >= rec.getWidth()) {
return false;
}
// TODO: this next test could be eased up. We could allow any number of
// intervals as long as all the ons match and all the offs match.
// Additionally, they do not necessarily need to be integers.
// We cannot allow arbitrary intervals since we want the returned points
// to be uniformly sized.
if (fCount != 2 ||
!SkScalarNearlyEqual(fIntervals[0], fIntervals[1]) ||
!SkScalarIsInt(fIntervals[0]) ||
!SkScalarIsInt(fIntervals[1])) {
return false;
}
SkPoint pts[2];
if (!src.isLine(pts)) {
return false;
}
// TODO: this test could be eased up to allow circles
if (SkPaint::kButt_Cap != rec.getCap()) {
return false;
}
// TODO: this test could be eased up for circles. Rotations could be allowed.
if (!matrix.rectStaysRect()) {
return false;
}
// See if the line can be limited to something plausible.
if (!cull_line(pts, rec, matrix, cullRect, fIntervalLength)) {
return false;
}
SkScalar length = SkPoint::Distance(pts[1], pts[0]);
SkVector tangent = pts[1] - pts[0];
if (tangent.isZero()) {
return false;
}
tangent.scale(SkScalarInvert(length));
// TODO: make this test for horizontal & vertical lines more robust
bool isXAxis = true;
if (SkScalarNearlyEqual(SK_Scalar1, tangent.fX) ||
SkScalarNearlyEqual(-SK_Scalar1, tangent.fX)) {
results->fSize.set(SkScalarHalf(fIntervals[0]), SkScalarHalf(rec.getWidth()));
} else if (SkScalarNearlyEqual(SK_Scalar1, tangent.fY) ||
SkScalarNearlyEqual(-SK_Scalar1, tangent.fY)) {
results->fSize.set(SkScalarHalf(rec.getWidth()), SkScalarHalf(fIntervals[0]));
isXAxis = false;
} else if (SkPaint::kRound_Cap != rec.getCap()) {
// Angled lines don't have axis-aligned boxes.
return false;
}
if (results) {
results->fFlags = 0;
SkScalar clampedInitialDashLength = SkMinScalar(length, fInitialDashLength);
if (SkPaint::kRound_Cap == rec.getCap()) {
results->fFlags |= PointData::kCircles_PointFlag;
}
results->fNumPoints = 0;
SkScalar len2 = length;
if (clampedInitialDashLength > 0 || 0 == fInitialDashIndex) {
SkASSERT(len2 >= clampedInitialDashLength);
if (0 == fInitialDashIndex) {
if (clampedInitialDashLength > 0) {
if (clampedInitialDashLength >= fIntervals[0]) {
++results->fNumPoints; // partial first dash
}
len2 -= clampedInitialDashLength;
}
len2 -= fIntervals[1]; // also skip first space
if (len2 < 0) {
len2 = 0;
}
} else {
len2 -= clampedInitialDashLength; // skip initial partial empty
}
}
int numMidPoints = SkScalarFloorToInt(len2 / fIntervalLength);
results->fNumPoints += numMidPoints;
len2 -= numMidPoints * fIntervalLength;
bool partialLast = false;
if (len2 > 0) {
if (len2 < fIntervals[0]) {
partialLast = true;
} else {
++numMidPoints;
++results->fNumPoints;
}
}
results->fPoints = new SkPoint[results->fNumPoints];
SkScalar distance = 0;
int curPt = 0;
if (clampedInitialDashLength > 0 || 0 == fInitialDashIndex) {
SkASSERT(clampedInitialDashLength <= length);
if (0 == fInitialDashIndex) {
if (clampedInitialDashLength > 0) {
// partial first block
SkASSERT(SkPaint::kRound_Cap != rec.getCap()); // can't handle partial circles
SkScalar x = pts[0].fX + SkScalarMul(tangent.fX, SkScalarHalf(clampedInitialDashLength));
SkScalar y = pts[0].fY + SkScalarMul(tangent.fY, SkScalarHalf(clampedInitialDashLength));
SkScalar halfWidth, halfHeight;
if (isXAxis) {
halfWidth = SkScalarHalf(clampedInitialDashLength);
halfHeight = SkScalarHalf(rec.getWidth());
} else {
halfWidth = SkScalarHalf(rec.getWidth());
halfHeight = SkScalarHalf(clampedInitialDashLength);
}
if (clampedInitialDashLength < fIntervals[0]) {
// This one will not be like the others
results->fFirst.addRect(x - halfWidth, y - halfHeight,
x + halfWidth, y + halfHeight);
} else {
SkASSERT(curPt < results->fNumPoints);
results->fPoints[curPt].set(x, y);
++curPt;
}
distance += clampedInitialDashLength;
}
distance += fIntervals[1]; // skip over the next blank block too
} else {
distance += clampedInitialDashLength;
}
}
if (0 != numMidPoints) {
distance += SkScalarHalf(fIntervals[0]);
for (int i = 0; i < numMidPoints; ++i) {
SkScalar x = pts[0].fX + SkScalarMul(tangent.fX, distance);
SkScalar y = pts[0].fY + SkScalarMul(tangent.fY, distance);
SkASSERT(curPt < results->fNumPoints);
results->fPoints[curPt].set(x, y);
++curPt;
distance += fIntervalLength;
}
distance -= SkScalarHalf(fIntervals[0]);
}
if (partialLast) {
// partial final block
SkASSERT(SkPaint::kRound_Cap != rec.getCap()); // can't handle partial circles
SkScalar temp = length - distance;
SkASSERT(temp < fIntervals[0]);
SkScalar x = pts[0].fX + SkScalarMul(tangent.fX, distance + SkScalarHalf(temp));
SkScalar y = pts[0].fY + SkScalarMul(tangent.fY, distance + SkScalarHalf(temp));
SkScalar halfWidth, halfHeight;
if (isXAxis) {
halfWidth = SkScalarHalf(temp);
halfHeight = SkScalarHalf(rec.getWidth());
} else {
halfWidth = SkScalarHalf(rec.getWidth());
halfHeight = SkScalarHalf(temp);
}
results->fLast.addRect(x - halfWidth, y - halfHeight,
x + halfWidth, y + halfHeight);
}
SkASSERT(curPt == results->fNumPoints);
}
return true;
}
void GrAARectRenderer::StrokeAARect(GrDrawTarget* target,
const GrPipelineBuilder& pipelineBuilder,
GrColor color,
const SkMatrix& viewMatrix,
const SkRect& rect,
const SkRect& devRect,
const SkStrokeRec& stroke) {
SkVector devStrokeSize;
SkScalar width = stroke.getWidth();
if (width > 0) {
devStrokeSize.set(width, width);
viewMatrix.mapVectors(&devStrokeSize, 1);
devStrokeSize.setAbs(devStrokeSize);
} else {
devStrokeSize.set(SK_Scalar1, SK_Scalar1);
}
const SkScalar dx = devStrokeSize.fX;
const SkScalar dy = devStrokeSize.fY;
const SkScalar rx = SkScalarMul(dx, SK_ScalarHalf);
const SkScalar ry = SkScalarMul(dy, SK_ScalarHalf);
SkScalar spare;
{
SkScalar w = devRect.width() - dx;
SkScalar h = devRect.height() - dy;
spare = SkTMin(w, h);
}
SkRect devOutside(devRect);
devOutside.outset(rx, ry);
bool miterStroke = true;
// For hairlines, make bevel and round joins appear the same as mitered ones.
// small miter limit means right angles show bevel...
if ((width > 0) && (stroke.getJoin() != SkPaint::kMiter_Join ||
stroke.getMiter() < SK_ScalarSqrt2)) {
miterStroke = false;
}
if (spare <= 0 && miterStroke) {
FillAARect(target, pipelineBuilder, color, viewMatrix, devOutside, devOutside);
return;
}
SkRect devInside(devRect);
devInside.inset(rx, ry);
SkRect devOutsideAssist(devRect);
// For bevel-stroke, use 2 SkRect instances(devOutside and devOutsideAssist)
// to draw the outer of the rect. Because there are 8 vertices on the outer
// edge, while vertex number of inner edge is 4, the same as miter-stroke.
if (!miterStroke) {
devOutside.inset(0, ry);
devOutsideAssist.outset(0, ry);
}
GeometryStrokeAARect(target, pipelineBuilder, color, viewMatrix, devOutside,
devOutsideAssist, devInside, miterStroke);
}
bool GrStrokePathRenderer::onDrawPath(const SkPath& origPath,
const SkStrokeRec& stroke,
GrDrawTarget* target,
bool antiAlias) {
if (origPath.isEmpty()) {
return true;
}
SkScalar width = stroke.getWidth();
if (width <= 0) {
return false;
}
// Get the join type
SkPaint::Join join = stroke.getJoin();
SkScalar miterLimit = stroke.getMiter();
SkScalar sqMiterLimit = SkScalarMul(miterLimit, miterLimit);
if ((join == SkPaint::kMiter_Join) && (miterLimit <= SK_Scalar1)) {
// If the miter limit is small, treat it as a bevel join
join = SkPaint::kBevel_Join;
}
const bool isMiter = (join == SkPaint::kMiter_Join);
const bool isBevel = (join == SkPaint::kBevel_Join);
SkScalar invMiterLimit = isMiter ? SK_Scalar1 / miterLimit : 0;
SkScalar invMiterLimitSq = SkScalarMul(invMiterLimit, invMiterLimit);
// Allocate vertices
const int nbQuads = origPath.countPoints() + 1; // Could be "-1" if path is not closed
const int extraVerts = isMiter || isBevel ? 1 : 0;
const int maxVertexCount = nbQuads * (4 + extraVerts);
const int maxIndexCount = nbQuads * (6 + extraVerts * 3); // Each extra vert adds a triangle
target->drawState()->setDefaultVertexAttribs();
GrDrawTarget::AutoReleaseGeometry arg(target, maxVertexCount, maxIndexCount);
if (!arg.succeeded()) {
return false;
}
SkPoint* verts = reinterpret_cast<SkPoint*>(arg.vertices());
uint16_t* idxs = reinterpret_cast<uint16_t*>(arg.indices());
int vCount = 0, iCount = 0;
// Transform the path into a list of triangles
SkPath::Iter iter(origPath, false);
SkPoint pts[4];
const SkScalar radius = SkScalarMul(width, 0.5f);
SkPoint *firstPt = verts, *lastPt = NULL;
SkVector firstDir, dir;
firstDir.set(0, 0);
dir.set(0, 0);
bool isOpen = true;
for(SkPath::Verb v = iter.next(pts); v != SkPath::kDone_Verb; v = iter.next(pts)) {
switch(v) {
case SkPath::kMove_Verb:
// This will already be handled as pts[0] of the 1st line
break;
case SkPath::kClose_Verb:
isOpen = (lastPt == NULL);
break;
case SkPath::kLine_Verb:
{
SkVector v0 = dir;
dir = pts[1] - pts[0];
if (dir.setLength(radius)) {
SkVector dirT;
dirT.set(dir.fY, -dir.fX); // Get perpendicular direction
SkPoint l1a = pts[0]+dirT, l1b = pts[1]+dirT,
l2a = pts[0]-dirT, l2b = pts[1]-dirT;
SkPoint miterPt[2];
bool useMiterPoint = false;
int idx0(-1), idx1(-1);
if (NULL == lastPt) {
firstDir = dir;
} else {
SkVector v1 = dir;
if (v0.normalize() && v1.normalize()) {
SkScalar dotProd = v0.dot(v1);
// No need for bevel or miter join if the angle
// is either 0 or 180 degrees
if (!SkScalarNearlyZero(dotProd + SK_Scalar1) &&
!SkScalarNearlyZero(dotProd - SK_Scalar1)) {
bool ccw = !is_clockwise(v0, v1);
int offset = ccw ? 1 : 0;
idx0 = vCount-2+offset;
idx1 = vCount+offset;
const SkPoint* pt0 = &(lastPt[offset]);
const SkPoint* pt1 = ccw ? &l2a : &l1a;
switch(join) {
case SkPaint::kMiter_Join:
{
// *Note : Logic is from MiterJoiner
// FIXME : Special case if we have a right angle ?
// if (SkScalarNearlyZero(dotProd)) {...}
SkScalar sinHalfAngleSq =
SkScalarHalf(SK_Scalar1 + dotProd);
if (sinHalfAngleSq >= invMiterLimitSq) {
// Find the miter point (or points if it is further
// than the miter limit)
const SkPoint pt2 = *pt0+v0, pt3 = *pt1+v1;
if (intersection(*pt0, pt2, *pt1, pt3, miterPt[0]) !=
kNone_IntersectionType) {
SkPoint miterPt0 = miterPt[0] - *pt0;
SkPoint miterPt1 = miterPt[0] - *pt1;
SkScalar sqDist0 = miterPt0.dot(miterPt0);
SkScalar sqDist1 = miterPt1.dot(miterPt1);
const SkScalar rSq =
SkScalarDiv(SkScalarMul(radius, radius),
sinHalfAngleSq);
const SkScalar sqRLimit =
SkScalarMul(sqMiterLimit, rSq);
if (sqDist0 > sqRLimit || sqDist1 > sqRLimit) {
if (sqDist1 > sqRLimit) {
v1.setLength(SkScalarSqrt(sqRLimit));
miterPt[1] = *pt1+v1;
} else {
miterPt[1] = miterPt[0];
}
if (sqDist0 > sqRLimit) {
v0.setLength(SkScalarSqrt(sqRLimit));
miterPt[0] = *pt0+v0;
}
} else {
miterPt[1] = miterPt[0];
}
useMiterPoint = true;
}
}
if (useMiterPoint && (miterPt[1] == miterPt[0])) {
break;
}
}
default:
case SkPaint::kBevel_Join:
{
// Note : This currently causes some overdraw where both
// lines initially intersect. We'd need to add
// another line intersection check here if the
// overdraw becomes an issue instead of using the
// current point directly.
// Add center point
*verts++ = pts[0]; // Use current point directly
// This idx is passed the current point so increment it
++idx1;
// Add center triangle
*idxs++ = idx0;
*idxs++ = vCount;
*idxs++ = idx1;
vCount++;
iCount += 3;
}
break;
}
}
}
}
*verts++ = l1a;
*verts++ = l2a;
lastPt = verts;
*verts++ = l1b;
*verts++ = l2b;
if (useMiterPoint && (idx0 >= 0) && (idx1 >= 0)) {
firstPt[idx0] = miterPt[0];
firstPt[idx1] = miterPt[1];
}
// 1st triangle
*idxs++ = vCount+0;
*idxs++ = vCount+2;
*idxs++ = vCount+1;
// 2nd triangle
*idxs++ = vCount+1;
*idxs++ = vCount+2;
*idxs++ = vCount+3;
vCount += 4;
iCount += 6;
}
}
break;
case SkPath::kQuad_Verb:
case SkPath::kCubic_Verb:
SkDEBUGFAIL("Curves not supported!");
default:
// Unhandled cases
SkASSERT(false);
}
}
if (isOpen) {
// Add caps
switch (stroke.getCap()) {
case SkPaint::kSquare_Cap:
firstPt[0] -= firstDir;
firstPt[1] -= firstDir;
lastPt [0] += dir;
lastPt [1] += dir;
break;
case SkPaint::kRound_Cap:
SkDEBUGFAIL("Round caps not supported!");
default: // No cap
break;
}
}
SkASSERT(vCount <= maxVertexCount);
SkASSERT(iCount <= maxIndexCount);
if (vCount > 0) {
target->drawIndexed(kTriangles_GrPrimitiveType,
0, // start vertex
0, // start index
vCount,
iCount);
}
return true;
}
void GrAARectRenderer::strokeAARect(GrDrawTarget* target,
GrDrawState* drawState,
GrColor color,
const SkRect& rect,
const SkMatrix& combinedMatrix,
const SkRect& devRect,
const SkStrokeRec& stroke) {
SkVector devStrokeSize;
SkScalar width = stroke.getWidth();
if (width > 0) {
devStrokeSize.set(width, width);
combinedMatrix.mapVectors(&devStrokeSize, 1);
devStrokeSize.setAbs(devStrokeSize);
} else {
devStrokeSize.set(SK_Scalar1, SK_Scalar1);
}
const SkScalar dx = devStrokeSize.fX;
const SkScalar dy = devStrokeSize.fY;
const SkScalar rx = SkScalarMul(dx, SK_ScalarHalf);
const SkScalar ry = SkScalarMul(dy, SK_ScalarHalf);
// Temporarily #if'ed out. We don't want to pass in the devRect but
// right now it is computed in GrContext::apply_aa_to_rect and we don't
// want to throw away the work
#if 0
SkRect devRect;
combinedMatrix.mapRect(&devRect, rect);
#endif
SkScalar spare;
{
SkScalar w = devRect.width() - dx;
SkScalar h = devRect.height() - dy;
spare = SkTMin(w, h);
}
SkRect devOutside(devRect);
devOutside.outset(rx, ry);
bool miterStroke = true;
// For hairlines, make bevel and round joins appear the same as mitered ones.
// small miter limit means right angles show bevel...
if ((width > 0) && (stroke.getJoin() != SkPaint::kMiter_Join ||
stroke.getMiter() < SK_ScalarSqrt2)) {
miterStroke = false;
}
if (spare <= 0 && miterStroke) {
this->fillAARect(target, drawState, color, devOutside, SkMatrix::I(), devOutside);
return;
}
SkRect devInside(devRect);
devInside.inset(rx, ry);
SkRect devOutsideAssist(devRect);
// For bevel-stroke, use 2 SkRect instances(devOutside and devOutsideAssist)
// to draw the outer of the rect. Because there are 8 vertices on the outer
// edge, while vertex number of inner edge is 4, the same as miter-stroke.
if (!miterStroke) {
devOutside.inset(0, ry);
devOutsideAssist.outset(0, ry);
}
this->geometryStrokeAARect(target, drawState, color, devOutside, devOutsideAssist, devInside,
miterStroke);
}
// Allow all hairlines and all miters, so long as the miter limit doesn't produce beveled corners.
inline static bool allowed_stroke(const SkStrokeRec& stroke) {
SkASSERT(stroke.getStyle() == SkStrokeRec::kStroke_Style ||
stroke.getStyle() == SkStrokeRec::kHairline_Style);
return !stroke.getWidth() ||
(stroke.getJoin() == SkPaint::kMiter_Join && stroke.getMiter() > SK_ScalarSqrt2);
}
bool GrDefaultPathRenderer::createGeom(const SkPath& path,
const SkStrokeRec& stroke,
SkScalar srcSpaceTol,
GrDrawTarget* target,
GrPrimitiveType* primType,
int* vertexCnt,
int* indexCnt,
GrDrawTarget::AutoReleaseGeometry* arg) {
{
SkScalar srcSpaceTolSqd = SkScalarMul(srcSpaceTol, srcSpaceTol);
int contourCnt;
int maxPts = GrPathUtils::worstCasePointCount(path, &contourCnt,
srcSpaceTol);
if (maxPts <= 0) {
return false;
}
if (maxPts > ((int)SK_MaxU16 + 1)) {
GrPrintf("Path not rendered, too many verts (%d)\n", maxPts);
return false;
}
bool indexed = contourCnt > 1;
const bool isHairline = stroke.isHairlineStyle();
int maxIdxs = 0;
if (isHairline) {
if (indexed) {
maxIdxs = 2 * maxPts;
*primType = kLines_GrPrimitiveType;
} else {
*primType = kLineStrip_GrPrimitiveType;
}
} else {
if (indexed) {
maxIdxs = 3 * maxPts;
*primType = kTriangles_GrPrimitiveType;
} else {
*primType = kTriangleFan_GrPrimitiveType;
}
}
target->drawState()->setDefaultVertexAttribs();
if (!arg->set(target, maxPts, maxIdxs)) {
return false;
}
uint16_t* idxBase = reinterpret_cast<uint16_t*>(arg->indices());
uint16_t* idx = idxBase;
uint16_t subpathIdxStart = 0;
SkPoint* base = reinterpret_cast<SkPoint*>(arg->vertices());
SkASSERT(NULL != base);
SkPoint* vert = base;
SkPoint pts[4];
bool first = true;
int subpath = 0;
SkPath::Iter iter(path, false);
for (;;) {
SkPath::Verb verb = iter.next(pts);
switch (verb) {
case SkPath::kConic_Verb:
SkASSERT(0);
break;
case SkPath::kMove_Verb:
if (!first) {
uint16_t currIdx = (uint16_t) (vert - base);
subpathIdxStart = currIdx;
++subpath;
}
*vert = pts[0];
vert++;
break;
case SkPath::kLine_Verb:
if (indexed) {
uint16_t prevIdx = (uint16_t)(vert - base) - 1;
append_countour_edge_indices(isHairline, subpathIdxStart,
prevIdx, &idx);
}
*(vert++) = pts[1];
break;
case SkPath::kQuad_Verb: {
// first pt of quad is the pt we ended on in previous step
uint16_t firstQPtIdx = (uint16_t)(vert - base) - 1;
uint16_t numPts = (uint16_t)
GrPathUtils::generateQuadraticPoints(
pts[0], pts[1], pts[2],
srcSpaceTolSqd, &vert,
GrPathUtils::quadraticPointCount(pts, srcSpaceTol));
if (indexed) {
for (uint16_t i = 0; i < numPts; ++i) {
append_countour_edge_indices(isHairline, subpathIdxStart,
firstQPtIdx + i, &idx);
}
}
break;
}
case SkPath::kCubic_Verb: {
// first pt of cubic is the pt we ended on in previous step
uint16_t firstCPtIdx = (uint16_t)(vert - base) - 1;
uint16_t numPts = (uint16_t) GrPathUtils::generateCubicPoints(
pts[0], pts[1], pts[2], pts[3],
srcSpaceTolSqd, &vert,
GrPathUtils::cubicPointCount(pts, srcSpaceTol));
if (indexed) {
for (uint16_t i = 0; i < numPts; ++i) {
append_countour_edge_indices(isHairline, subpathIdxStart,
firstCPtIdx + i, &idx);
}
}
break;
}
case SkPath::kClose_Verb:
break;
case SkPath::kDone_Verb:
// uint16_t currIdx = (uint16_t) (vert - base);
goto FINISHED;
}
first = false;
}
FINISHED:
SkASSERT((vert - base) <= maxPts);
SkASSERT((idx - idxBase) <= maxIdxs);
*vertexCnt = static_cast<int>(vert - base);
*indexCnt = static_cast<int>(idx - idxBase);
}
return true;
}
bool GrStencilAndCoverPathRenderer::onDrawPath(const SkPath& path,
const SkStrokeRec& stroke,
GrDrawTarget* target,
bool antiAlias) {
SkASSERT(!antiAlias);
SkASSERT(!stroke.isHairlineStyle());
GrDrawState* drawState = target->drawState();
SkASSERT(drawState->getStencil().isDisabled());
SkAutoTUnref<GrPath> p(fGpu->createPath(path));
SkPath::FillType nonInvertedFill = SkPath::ConvertToNonInverseFillType(path.getFillType());
target->stencilPath(p, stroke, nonInvertedFill);
// TODO: Use built in cover operation rather than a rect draw. This will require making our
// fragment shaders be able to eat varyings generated by a matrix.
// fill the path, zero out the stencil
SkRect bounds = p->getBounds();
SkScalar bloat = drawState->getViewMatrix().getMaxStretch() * SK_ScalarHalf;
GrDrawState::AutoViewMatrixRestore avmr;
if (nonInvertedFill == path.getFillType()) {
GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
kZero_StencilOp,
kZero_StencilOp,
kNotEqual_StencilFunc,
0xffff,
0x0000,
0xffff);
*drawState->stencil() = kStencilPass;
} else {
GR_STATIC_CONST_SAME_STENCIL(kInvertedStencilPass,
kZero_StencilOp,
kZero_StencilOp,
// We know our rect will hit pixels outside the clip and the user bits will be 0
// outside the clip. So we can't just fill where the user bits are 0. We also need to
// check that the clip bit is set.
kEqualIfInClip_StencilFunc,
0xffff,
0x0000,
0xffff);
SkMatrix vmi;
bounds.setLTRB(0, 0,
SkIntToScalar(drawState->getRenderTarget()->width()),
SkIntToScalar(drawState->getRenderTarget()->height()));
// mapRect through persp matrix may not be correct
if (!drawState->getViewMatrix().hasPerspective() && drawState->getViewInverse(&vmi)) {
vmi.mapRect(&bounds);
// theoretically could set bloat = 0, instead leave it because of matrix inversion
// precision.
} else {
avmr.setIdentity(drawState);
bloat = 0;
}
*drawState->stencil() = kInvertedStencilPass;
}
bounds.outset(bloat, bloat);
target->drawSimpleRect(bounds, NULL);
target->drawState()->stencil()->setDisabled();
return true;
}
bool GrStencilAndCoverPathRenderer::onDrawPath(const SkPath& path,
const SkStrokeRec& stroke,
GrDrawTarget* target,
bool antiAlias) {
SkASSERT(!antiAlias);
SkASSERT(!stroke.isHairlineStyle());
GrDrawState* drawState = target->drawState();
SkASSERT(drawState->getStencil().isDisabled());
SkAutoTUnref<GrPath> p(get_gr_path(fGpu, path, stroke));
if (path.isInverseFillType()) {
GR_STATIC_CONST_SAME_STENCIL(kInvertedStencilPass,
kZero_StencilOp,
kZero_StencilOp,
// We know our rect will hit pixels outside the clip and the user bits will be 0
// outside the clip. So we can't just fill where the user bits are 0. We also need to
// check that the clip bit is set.
kEqualIfInClip_StencilFunc,
0xffff,
0x0000,
0xffff);
drawState->setStencil(kInvertedStencilPass);
// fake inverse with a stencil and cover
target->stencilPath(p, convert_skpath_filltype(path.getFillType()));
GrDrawState::AutoViewMatrixRestore avmr;
SkRect bounds = SkRect::MakeLTRB(0, 0,
SkIntToScalar(drawState->getRenderTarget()->width()),
SkIntToScalar(drawState->getRenderTarget()->height()));
SkMatrix vmi;
// mapRect through persp matrix may not be correct
if (!drawState->getViewMatrix().hasPerspective() && drawState->getViewInverse(&vmi)) {
vmi.mapRect(&bounds);
// theoretically could set bloat = 0, instead leave it because of matrix inversion
// precision.
SkScalar bloat = drawState->getViewMatrix().getMaxScale() * SK_ScalarHalf;
bounds.outset(bloat, bloat);
} else {
avmr.setIdentity(drawState);
}
target->drawSimpleRect(bounds);
} else {
GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
kZero_StencilOp,
kZero_StencilOp,
kNotEqual_StencilFunc,
0xffff,
0x0000,
0xffff);
drawState->setStencil(kStencilPass);
target->drawPath(p, convert_skpath_filltype(path.getFillType()));
}
target->drawState()->stencil()->setDisabled();
return true;
}
