add Convexity enum to SkPath
git-svn-id: http://skia.googlecode.com/svn/trunk@1324 2bbb7eff-a529-9590-31e7-b0007b416f81
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reed@google.com
parent
a8fd79d407
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04863fa14a
@ -96,19 +96,54 @@ public:
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GEN_ID_INC;
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}
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/** Returns true if the path is flagged as being convex. This is not a
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confirmed by any analysis, it is just the value set earlier.
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*/
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bool isConvex() const { return fIsConvex != 0; }
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enum Convexity {
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kUnknown_Convexity,
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kConvex_Convexity,
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kConcave_Convexity
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};
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/** Set the isConvex flag to true or false. Convex paths may draw faster if
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this flag is set, though setting this to true on a path that is in fact
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not convex can give undefined results when drawn. Paths default to
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isConvex == false
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/**
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* Return the path's convexity, as stored in the path.
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*/
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Convexity getConvexity() const { return (Convexity)fConvexity; }
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/**
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* Store a convexity setting in the path. There is no automatic check to
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* see if this value actually agress with the return value from
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* ComputeConvexity().
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*/
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void setConvexity(Convexity);
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/**
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* Compute the convexity of the specified path. This does not look at the
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* value stored in the path, but computes it directly from the path's data.
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*
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* If there is more than one contour, this returns kConcave_Convexity.
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* If the contour is degenerate (i.e. all segements are colinear,
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* then this returns kUnknown_Convexity.
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* The contour is treated as if it were closed, even if there is no kClose
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* verb.
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*/
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static Convexity ComputeConvexity(const SkPath&);
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/**
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* DEPRECATED: use getConvexity()
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* Returns true if the path is flagged as being convex. This is not a
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* confirmed by any analysis, it is just the value set earlier.
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*/
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bool isConvex() const {
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return kConvex_Convexity == this->getConvexity();
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}
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/**
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* DEPRECATED: use setConvexity()
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* Set the isConvex flag to true or false. Convex paths may draw faster if
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* this flag is set, though setting this to true on a path that is in fact
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* not convex can give undefined results when drawn. Paths default to
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* isConvex == false
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*/
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void setIsConvex(bool isConvex) {
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fIsConvex = (isConvex != 0);
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GEN_ID_INC;
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this->setConvexity(isConvex ? kConvex_Convexity : kConcave_Convexity);
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}
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/** Clear any lines and curves from the path, making it empty. This frees up
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@ -600,7 +635,7 @@ private:
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mutable SkRect fBounds;
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mutable uint8_t fBoundsIsDirty;
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uint8_t fFillType;
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uint8_t fIsConvex;
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uint8_t fConvexity;
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#ifdef ANDROID
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uint32_t fGenerationID;
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#endif
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@ -1,32 +1,60 @@
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#include "SampleCode.h"
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#include "SkView.h"
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#include "SkCanvas.h"
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#include "SkBlurMaskFilter.h"
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#include "SkCamera.h"
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#include "SkColorFilter.h"
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#include "SkColorPriv.h"
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#include "SkDevice.h"
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#include "SkGradientShader.h"
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#include "SkImageDecoder.h"
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#include "SkInterpolator.h"
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#include "SkMaskFilter.h"
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#include "SkPath.h"
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#include "SkRegion.h"
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#include "SkShader.h"
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#include "SkShaderExtras.h"
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#include "SkTime.h"
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#include "SkTypeface.h"
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#include "SkUtils.h"
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#include "SkKey.h"
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#include "SkXfermode.h"
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#include "SkDrawFilter.h"
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#include "test.h"
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namespace skiatest {
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class MyReporter : public Reporter {
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protected:
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virtual void onStart(Test* test) {}
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virtual void onReport(const char desc[], Reporter::Result result) {
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SkASSERT(Reporter::kPassed == result);
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}
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virtual void onEnd(Test* test) {}
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};
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class Iter {
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public:
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Iter(Reporter* r) : fReporter(r) {
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r->ref();
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fReg = TestRegistry::Head();
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}
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~Iter() {
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fReporter->unref();
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}
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Test* next() {
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if (fReg) {
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TestRegistry::Factory fact = fReg->factory();
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fReg = fReg->next();
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Test* test = fact(NULL);
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test->setReporter(fReporter);
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return test;
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}
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return NULL;
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}
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static int Count() {
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const TestRegistry* reg = TestRegistry::Head();
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int count = 0;
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while (reg) {
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count += 1;
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reg = reg->next();
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}
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return count;
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}
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private:
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Reporter* fReporter;
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const TestRegistry* fReg;
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};
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}
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class TestsView : public SkView {
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public:
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skia::Test::Iter fIter;
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TestsView() {}
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protected:
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@ -45,30 +73,15 @@ protected:
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virtual void onDraw(SkCanvas* canvas) {
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this->drawBG(canvas);
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skiatest::MyReporter reporter;
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skiatest::Iter iter(&reporter);
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skiatest::Test* test;
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skia::Test* test = fIter.next();
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if (NULL == test) {
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fIter.reset();
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test = fIter.next();
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while ((test = iter.next()) != NULL) {
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test->run();
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SkDELETE(test);
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}
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SkIPoint size;
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test->getSize(&size);
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SkBitmap bitmap;
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bitmap.setConfig(SkBitmap::kARGB_8888_Config, size.fX, size.fY);
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bitmap.allocPixels();
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bitmap.eraseColor(0);
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SkCanvas c(bitmap);
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test->draw(&c);
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canvas->drawBitmap(bitmap, SkIntToScalar(10), SkIntToScalar(10), NULL);
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SkString str;
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test->getString(skia::Test::kTitle, &str);
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SkDebugf("--- %s\n", str.c_str());
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delete test;
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}
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virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
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@ -97,7 +97,7 @@ static void compute_pt_bounds(SkRect* bounds, const SkTDArray<SkPoint>& pts) {
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////////////////////////////////////////////////////////////////////////////
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SkPath::SkPath() : fBoundsIsDirty(true), fFillType(kWinding_FillType) {
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fIsConvex = false; // really should be kUnknown
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fConvexity = kUnknown_Convexity;
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#ifdef ANDROID
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fGenerationID = 0;
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#endif
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@ -125,7 +125,7 @@ SkPath& SkPath::operator=(const SkPath& src) {
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fVerbs = src.fVerbs;
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fFillType = src.fFillType;
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fBoundsIsDirty = src.fBoundsIsDirty;
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fIsConvex = src.fIsConvex;
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fConvexity = src.fConvexity;
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GEN_ID_INC;
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}
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SkDEBUGCODE(this->validate();)
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@ -148,7 +148,7 @@ void SkPath::swap(SkPath& other) {
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fVerbs.swap(other.fVerbs);
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SkTSwap<uint8_t>(fFillType, other.fFillType);
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SkTSwap<uint8_t>(fBoundsIsDirty, other.fBoundsIsDirty);
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SkTSwap<uint8_t>(fIsConvex, other.fIsConvex);
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SkTSwap<uint8_t>(fConvexity, other.fConvexity);
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GEN_ID_INC;
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}
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}
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@ -166,7 +166,7 @@ void SkPath::reset() {
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fVerbs.reset();
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GEN_ID_INC;
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fBoundsIsDirty = true;
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fIsConvex = false; // really should be kUnknown
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fConvexity = kUnknown_Convexity;
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}
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void SkPath::rewind() {
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@ -176,7 +176,7 @@ void SkPath::rewind() {
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fVerbs.rewind();
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GEN_ID_INC;
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fBoundsIsDirty = true;
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fIsConvex = false; // really should be kUnknown
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fConvexity = kUnknown_Convexity;
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}
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bool SkPath::isEmpty() const {
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@ -244,6 +244,13 @@ void SkPath::computeBounds() const {
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compute_pt_bounds(&fBounds, fPts);
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}
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void SkPath::setConvexity(Convexity c) {
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if (fConvexity != c) {
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fConvexity = c;
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GEN_ID_INC;
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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// Construction methods
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@ -1382,3 +1389,125 @@ void SkPath::validate() const {
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}
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#endif
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///////////////////////////////////////////////////////////////////////////////
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/**
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* Returns -1 || 0 || 1 depending on the sign of value:
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* -1 if value < 0
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* 0 if vlaue == 0
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* 1 if value > 0
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*/
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static int SkScalarSign(SkScalar value) {
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return value < 0 ? -1 : (value > 0);
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}
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static int CrossProductSign(const SkVector& a, const SkVector& b) {
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return SkScalarSign(SkPoint::CrossProduct(a, b));
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}
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// only valid for a single contour
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struct Convexicator {
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Convexicator() : fPtCount(0), fConvexity(SkPath::kUnknown_Convexity) {
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fSign = 0;
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// warnings
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fCurrPt.set(0, 0);
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fVec0.set(0, 0);
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fVec1.set(0, 0);
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fFirstVec.set(0, 0);
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}
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SkPath::Convexity getConvexity() const { return fConvexity; }
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void addPt(const SkPoint& pt) {
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if (SkPath::kConcave_Convexity == fConvexity) {
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return;
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}
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if (0 == fPtCount) {
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fCurrPt = pt;
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++fPtCount;
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} else {
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SkVector vec = pt - fCurrPt;
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if (vec.fX || vec.fY) {
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fCurrPt = pt;
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if (++fPtCount == 2) {
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fFirstVec = fVec1 = vec;
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} else {
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SkASSERT(fPtCount > 2);
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this->addVec(vec);
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}
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}
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}
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}
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void close() {
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if (fPtCount > 2) {
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this->addVec(fFirstVec);
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}
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}
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private:
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void addVec(const SkVector& vec) {
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SkASSERT(vec.fX || vec.fY);
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fVec0 = fVec1;
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fVec1 = vec;
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int sign = CrossProductSign(fVec0, fVec1);
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if (0 == fSign) {
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fSign = sign;
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} else if (sign) {
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if (fSign == sign) {
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fConvexity = SkPath::kConvex_Convexity;
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} else {
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fConvexity = SkPath::kConcave_Convexity;
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}
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}
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}
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SkPoint fCurrPt;
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SkVector fVec0, fVec1, fFirstVec;
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int fPtCount; // non-degenerate points
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int fSign;
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SkPath::Convexity fConvexity;
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};
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SkPath::Convexity SkPath::ComputeConvexity(const SkPath& path) {
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SkPoint pts[4];
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SkPath::Verb verb;
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SkPath::Iter iter(path, true);
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int contourCount = 0;
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int count;
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Convexicator state;
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while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
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switch (verb) {
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case kMove_Verb:
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if (++contourCount > 1) {
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return kConcave_Convexity;
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}
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pts[1] = pts[0];
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count = 1;
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break;
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case kLine_Verb: count = 1; break;
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case kQuad_Verb: count = 2; break;
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case kCubic_Verb: count = 3; break;
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case kClose_Verb:
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state.close();
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count = 0;
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break;
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default:
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SkASSERT(!"bad verb");
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return kConcave_Convexity;
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}
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for (int i = 1; i <= count; i++) {
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state.addPt(pts[i]);
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}
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// early exit
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if (kConcave_Convexity == state.getConvexity()) {
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return kConcave_Convexity;
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}
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}
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return state.getConvexity();
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}
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@ -1,5 +1,6 @@
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#include "Test.h"
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#include "SkPath.h"
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#include "SkParse.h"
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#include "SkSize.h"
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static void check_convex_bounds(skiatest::Reporter* reporter, const SkPath& p,
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@ -17,7 +18,67 @@ static void check_convex_bounds(skiatest::Reporter* reporter, const SkPath& p,
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REPORTER_ASSERT(reporter, other.getBounds() == bounds);
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}
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static void TestPath(skiatest::Reporter* reporter) {
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static void setFromString(SkPath* path, const char str[]) {
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bool first = true;
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while (str) {
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SkScalar x, y;
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str = SkParse::FindScalar(str, &x);
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if (NULL == str) {
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break;
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}
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str = SkParse::FindScalar(str, &y);
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SkASSERT(str);
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if (first) {
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path->moveTo(x, y);
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first = false;
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} else {
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path->lineTo(x, y);
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}
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}
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}
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static void test_convexity(skiatest::Reporter* reporter) {
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static const SkPath::Convexity U = SkPath::kUnknown_Convexity;
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static const SkPath::Convexity C = SkPath::kConcave_Convexity;
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static const SkPath::Convexity V = SkPath::kConvex_Convexity;
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SkPath path;
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REPORTER_ASSERT(reporter, U == SkPath::ComputeConvexity(path));
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path.addCircle(0, 0, 10);
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REPORTER_ASSERT(reporter, V == SkPath::ComputeConvexity(path));
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path.addCircle(0, 0, 10); // 2nd circle
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REPORTER_ASSERT(reporter, C == SkPath::ComputeConvexity(path));
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path.reset();
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path.addRect(0, 0, 10, 10, SkPath::kCCW_Direction);
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REPORTER_ASSERT(reporter, V == SkPath::ComputeConvexity(path));
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path.reset();
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path.addRect(0, 0, 10, 10, SkPath::kCW_Direction);
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REPORTER_ASSERT(reporter, V == SkPath::ComputeConvexity(path));
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static const struct {
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const char* fPathStr;
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SkPath::Convexity fExpectedConvexity;
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} gRec[] = {
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{ "0 0", SkPath::kUnknown_Convexity },
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{ "0 0 10 10", SkPath::kUnknown_Convexity },
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{ "0 0 10 10 20 20 0 0 10 10", SkPath::kUnknown_Convexity },
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{ "0 0 10 10 10 20", SkPath::kConvex_Convexity },
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{ "0 0 10 10 10 0", SkPath::kConvex_Convexity },
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{ "0 0 10 10 10 0 0 10", SkPath::kConcave_Convexity },
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{ "0 0 10 0 0 10 -10 -10", SkPath::kConcave_Convexity },
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};
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for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
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SkPath path;
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setFromString(&path, gRec[i].fPathStr);
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SkPath::Convexity c = SkPath::ComputeConvexity(path);
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REPORTER_ASSERT(reporter, c == gRec[i].fExpectedConvexity);
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}
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}
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void TestPath(skiatest::Reporter* reporter);
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void TestPath(skiatest::Reporter* reporter) {
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{
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SkSize size;
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size.fWidth = 3.4f;
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@ -100,6 +161,8 @@ static void TestPath(skiatest::Reporter* reporter) {
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REPORTER_ASSERT(reporter, p.isConvex());
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p.rewind();
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REPORTER_ASSERT(reporter, !p.isConvex());
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test_convexity(reporter);
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}
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#include "TestClassDef.h"
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