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- /*
- * 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/gm.h"
- #include "include/core/SkCanvas.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkPath.h"
- #include "include/core/SkScalar.h"
- #include "include/core/SkSize.h"
- #include "include/core/SkString.h"
- #include "include/core/SkTypes.h"
- namespace skiagm {
- // This GM tests a grab-bag of non-closed paths. All these paths look like
- // closed rects, but they don't call path.close(). Depending on the stroke
- // settings these slightly different paths give widely different results.
- class NonClosedPathsGM: public GM {
- public:
- NonClosedPathsGM() {}
- enum ClosureType {
- TotallyNonClosed, // The last point doesn't coincide with the first one in the contour.
- // The path looks not closed at all.
- FakeCloseCorner, // The last point coincides with the first one at a corner.
- // The path looks closed, but final rendering has 2 ends with cap.
- FakeCloseMiddle, // The last point coincides with the first one in the middle of a line.
- // The path looks closed, and the final rendering looks closed too.
- kClosureTypeCount
- };
- protected:
- SkString onShortName() override {
- return SkString("nonclosedpaths");
- }
- // 12 * 18 + 3 cases, every case is 100 * 100 pixels.
- SkISize onISize() override {
- return SkISize::Make(1220, 1920);
- }
- // Use rect-like geometry for non-closed path, for right angles make it
- // easier to show the visual difference of lineCap and lineJoin.
- static void MakePath(SkPath* path, ClosureType type) {
- if (FakeCloseMiddle == type) {
- path->moveTo(30, 50);
- path->lineTo(30, 30);
- } else {
- path->moveTo(30, 30);
- }
- path->lineTo(70, 30);
- path->lineTo(70, 70);
- path->lineTo(30, 70);
- path->lineTo(30, 50);
- if (FakeCloseCorner == type) {
- path->lineTo(30, 30);
- }
- }
- // Set the location for the current test on the canvas
- static void SetLocation(SkCanvas* canvas, int counter, int lineNum) {
- SkScalar x = SK_Scalar1 * 100 * (counter % lineNum) + 10 + SK_Scalar1 / 4;
- SkScalar y = SK_Scalar1 * 100 * (counter / lineNum) + 10 + 3 * SK_Scalar1 / 4;
- canvas->translate(x, y);
- }
- void onDraw(SkCanvas* canvas) override {
- // Stroke widths are:
- // 0(may use hairline rendering), 10(common case for stroke-style)
- // 40 and 50(>= geometry width/height, make the contour filled in fact)
- constexpr int kStrokeWidth[] = {0, 10, 40, 50};
- int numWidths = SK_ARRAY_COUNT(kStrokeWidth);
- constexpr SkPaint::Style kStyle[] = {
- SkPaint::kStroke_Style, SkPaint::kStrokeAndFill_Style
- };
- constexpr SkPaint::Cap kCap[] = {
- SkPaint::kButt_Cap, SkPaint::kRound_Cap, SkPaint::kSquare_Cap
- };
- constexpr SkPaint::Join kJoin[] = {
- SkPaint::kMiter_Join, SkPaint::kRound_Join, SkPaint::kBevel_Join
- };
- constexpr ClosureType kType[] = {
- TotallyNonClosed, FakeCloseCorner, FakeCloseMiddle
- };
- int counter = 0;
- SkPaint paint;
- paint.setAntiAlias(true);
- // For stroke style painter and fill-and-stroke style painter
- for (size_t type = 0; type < kClosureTypeCount; ++type) {
- for (size_t style = 0; style < SK_ARRAY_COUNT(kStyle); ++style) {
- for (size_t cap = 0; cap < SK_ARRAY_COUNT(kCap); ++cap) {
- for (size_t join = 0; join < SK_ARRAY_COUNT(kJoin); ++join) {
- for (int width = 0; width < numWidths; ++width) {
- canvas->save();
- SetLocation(canvas, counter, SkPaint::kJoinCount * numWidths);
- SkPath path;
- MakePath(&path, kType[type]);
- paint.setStyle(kStyle[style]);
- paint.setStrokeCap(kCap[cap]);
- paint.setStrokeJoin(kJoin[join]);
- paint.setStrokeWidth(SkIntToScalar(kStrokeWidth[width]));
- canvas->drawPath(path, paint);
- canvas->restore();
- ++counter;
- }
- }
- }
- }
- }
- // For fill style painter
- paint.setStyle(SkPaint::kFill_Style);
- for (size_t type = 0; type < kClosureTypeCount; ++type) {
- canvas->save();
- SetLocation(canvas, counter, SkPaint::kJoinCount * numWidths);
- SkPath path;
- MakePath(&path, kType[type]);
- canvas->drawPath(path, paint);
- canvas->restore();
- ++counter;
- }
- }
- private:
- typedef GM INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_GM(return new NonClosedPathsGM;)
- }
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