Add GM to test conic path rendering
R=reed@google.com
Review URL: https://codereview.chromium.org/17365006
git-svn-id: http://skia.googlecode.com/svn/trunk@9702 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/conicpaths.cpp b/gm/conicpaths.cpp
new file mode 100644
index 0000000..9db2b53
--- /dev/null
+++ b/gm/conicpaths.cpp
@@ -0,0 +1,164 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gm.h"
+#include "SkCanvas.h"
+#include "SkTArray.h"
+
+namespace skiagm {
+
+class ConicPathsGM : public GM {
+protected:
+
+ virtual SkString onShortName() SK_OVERRIDE {
+ return SkString("conicpaths");
+ }
+
+ virtual SkISize onISize() SK_OVERRIDE {
+ return SkISize::Make(800, 600);
+ }
+
+ virtual void onOnceBeforeDraw() SK_OVERRIDE {
+ {
+ SkPath* conicCirlce = &fPaths.push_back();
+ conicCirlce->moveTo(0, -0);
+ conicCirlce->conicTo(SkIntToScalar(0), SkIntToScalar(50),
+ SkIntToScalar(50), SkIntToScalar(50),
+ SkScalarHalf(SkScalarSqrt(2)));
+ conicCirlce->rConicTo(SkIntToScalar(50), SkIntToScalar(0),
+ SkIntToScalar(50), SkIntToScalar(-50),
+ SkScalarHalf(SkScalarSqrt(2)));
+ conicCirlce->rConicTo(SkIntToScalar(0), SkIntToScalar(-50),
+ SkIntToScalar(-50), SkIntToScalar(-50),
+ SkScalarHalf(SkScalarSqrt(2)));
+ conicCirlce->rConicTo(SkIntToScalar(-50), SkIntToScalar(0),
+ SkIntToScalar(-50), SkIntToScalar(50),
+ SkScalarHalf(SkScalarSqrt(2)));
+
+ }
+ {
+ SkPath* hyperbola = &fPaths.push_back();
+ hyperbola->moveTo(0, -0);
+ hyperbola->conicTo(SkIntToScalar(0), SkIntToScalar(100),
+ SkIntToScalar(100), SkIntToScalar(100),
+ SkIntToScalar(2));
+ }
+ {
+ SkPath* thinHyperbola = &fPaths.push_back();
+ thinHyperbola->moveTo(0, -0);
+ thinHyperbola->conicTo(SkIntToScalar(100), SkIntToScalar(100),
+ SkIntToScalar(5), SkIntToScalar(0),
+ SkIntToScalar(2));
+ }
+ {
+ SkPath* veryThinHyperbola = &fPaths.push_back();
+ veryThinHyperbola->moveTo(0, -0);
+ veryThinHyperbola->conicTo(SkIntToScalar(100), SkIntToScalar(100),
+ SkIntToScalar(1), SkIntToScalar(0),
+ SkIntToScalar(2));
+ }
+ {
+ SkPath* closedHyperbola = &fPaths.push_back();
+ closedHyperbola->moveTo(0, -0);
+ closedHyperbola->conicTo(SkIntToScalar(100), SkIntToScalar(100),
+ SkIntToScalar(0), SkIntToScalar(0),
+ SkIntToScalar(2));
+ }
+ {
+ // using 1 as weight defaults to using quadTo
+ SkPath* nearParabola = &fPaths.push_back();
+ nearParabola->moveTo(0, -0);
+ nearParabola->conicTo(SkIntToScalar(0), SkIntToScalar(100),
+ SkIntToScalar(100), SkIntToScalar(100),
+ 0.999);
+ }
+ {
+ SkPath* thinEllipse = &fPaths.push_back();
+ thinEllipse->moveTo(0, -0);
+ thinEllipse->conicTo(SkIntToScalar(100), SkIntToScalar(100),
+ SkIntToScalar(5), SkIntToScalar(0),
+ SK_ScalarHalf);
+ }
+ {
+ SkPath* veryThinEllipse = &fPaths.push_back();
+ veryThinEllipse->moveTo(0, -0);
+ veryThinEllipse->conicTo(SkIntToScalar(100), SkIntToScalar(100),
+ SkIntToScalar(1), SkIntToScalar(0),
+ SK_ScalarHalf);
+ }
+ {
+ SkPath* closedEllipse = &fPaths.push_back();
+ closedEllipse->moveTo(0, -0);
+ closedEllipse->conicTo(SkIntToScalar(100), SkIntToScalar(100),
+ SkIntToScalar(0), SkIntToScalar(0),
+ SK_ScalarHalf);
+ }
+ }
+
+ virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+ static const SkAlpha kAlphaValue[] = { 0xFF, 0x40 };
+
+ enum {
+ kMargin = 15,
+ };
+ int wrapX = canvas->getDeviceSize().fWidth - kMargin;
+
+ SkScalar maxH = 0;
+ canvas->translate(SkIntToScalar(kMargin), SkIntToScalar(kMargin));
+ canvas->save();
+
+ SkScalar x = SkIntToScalar(kMargin);
+ for (int p = 0; p < fPaths.count(); ++p) {
+ for (size_t a = 0; a < SK_ARRAY_COUNT(kAlphaValue); ++a) {
+ for (int aa = 0; aa < 2; ++aa) {
+ for (int fh = 0; fh < 2; ++fh) {
+
+ const SkRect& bounds = fPaths[p].getBounds();
+
+ if (x + bounds.width() > wrapX) {
+ canvas->restore();
+ canvas->translate(0, maxH + SkIntToScalar(kMargin));
+ canvas->save();
+ maxH = 0;
+ x = SkIntToScalar(kMargin);
+ }
+
+ SkPaint paint;
+ paint.setARGB(kAlphaValue[a], 0, 0, 0);
+ paint.setAntiAlias(SkToBool(aa));
+ if (fh == 1) {
+ paint.setStyle(SkPaint::kStroke_Style);
+ paint.setStrokeWidth(0);
+ } else if (fh == 0) {
+ paint.setStyle(SkPaint::kFill_Style);
+ }
+ canvas->save();
+ canvas->translate(-bounds.fLeft, -bounds.fTop);
+ canvas->drawPath(fPaths[p], paint);
+ canvas->restore();
+
+ maxH = SkMaxScalar(maxH, bounds.height());
+
+ SkScalar dx = bounds.width() + SkIntToScalar(kMargin);
+ x += dx;
+ canvas->translate(dx, 0);
+ }
+ }
+ }
+ }
+ canvas->restore();
+ }
+
+private:
+ SkTArray<SkPath> fPaths;
+ typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+DEF_GM( return SkNEW(ConicPathsGM); )
+}