Add small paths GM
Used to testing caching and quality of distance field paths.
Review URL: https://codereview.chromium.org/1456823003
diff --git a/gm/smallpaths.cpp b/gm/smallpaths.cpp
new file mode 100644
index 0000000..1936782
--- /dev/null
+++ b/gm/smallpaths.cpp
@@ -0,0 +1,276 @@
+/*
+ * Copyright 2015 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 "SkPath.h"
+
+typedef SkScalar (*MakePathProc)(SkPath*);
+
+static SkScalar make_triangle(SkPath* path) {
+ static const int gCoord[] = {
+ 10, 20, 15, 5, 30, 30
+ };
+ path->moveTo(SkIntToScalar(gCoord[0]), SkIntToScalar(gCoord[1]));
+ path->lineTo(SkIntToScalar(gCoord[2]), SkIntToScalar(gCoord[3]));
+ path->lineTo(SkIntToScalar(gCoord[4]), SkIntToScalar(gCoord[5]));
+ path->close();
+ path->offset(SkIntToScalar(10), SkIntToScalar(0));
+ return SkIntToScalar(30);
+}
+
+static SkScalar make_rect(SkPath* path) {
+ SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
+ SkIntToScalar(30), SkIntToScalar(30) };
+ path->addRect(r);
+ path->offset(SkIntToScalar(10), SkIntToScalar(0));
+ return SkIntToScalar(30);
+}
+
+static SkScalar make_oval(SkPath* path) {
+ SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
+ SkIntToScalar(30), SkIntToScalar(30) };
+ path->addOval(r);
+ path->offset(SkIntToScalar(10), SkIntToScalar(0));
+ return SkIntToScalar(30);
+}
+
+static SkScalar make_star(SkPath* path, int n) {
+ const SkScalar c = SkIntToScalar(45);
+ const SkScalar r = SkIntToScalar(20);
+
+ SkScalar rad = -SK_ScalarPI / 2;
+ const SkScalar drad = (n >> 1) * SK_ScalarPI * 2 / n;
+
+ path->moveTo(c, c - r);
+ for (int i = 1; i < n; i++) {
+ rad += drad;
+ SkScalar cosV, sinV = SkScalarSinCos(rad, &cosV);
+ path->lineTo(c + SkScalarMul(cosV, r), c + SkScalarMul(sinV, r));
+ }
+ path->close();
+ return r * 2 * 6 / 5;
+}
+
+static SkScalar make_star_5(SkPath* path) { return make_star(path, 5); }
+static SkScalar make_star_13(SkPath* path) { return make_star(path, 13); }
+
+static SkScalar make_three_line(SkPath* path) {
+ static SkScalar xOffset = 34.f;
+ static SkScalar yOffset = 50.f;
+ path->moveTo(-32.5f + xOffset, 0.0f + yOffset);
+ path->lineTo(32.5f + xOffset, 0.0f + yOffset);
+
+ path->moveTo(-32.5f + xOffset, 19 + yOffset);
+ path->lineTo(32.5f + xOffset, 19 + yOffset);
+
+ path->moveTo(-32.5f + xOffset, -19 + yOffset);
+ path->lineTo(32.5f + xOffset, -19 + yOffset);
+ path->lineTo(-32.5f + xOffset, -19 + yOffset);
+
+ path->close();
+
+ return SkIntToScalar(70);
+}
+
+static SkScalar make_arrow(SkPath* path) {
+ static SkScalar xOffset = 34.f;
+ static SkScalar yOffset = 40.f;
+ path->moveTo(-26.f + xOffset, 0.0f + yOffset);
+ path->lineTo(26.f + xOffset, 0.0f + yOffset);
+
+ path->moveTo(-28.f + xOffset, -2.4748745f + yOffset);
+ path->lineTo(0 + xOffset, 25.525126f + yOffset);
+
+ path->moveTo(-28.f + xOffset, 2.4748745f + yOffset);
+ path->lineTo(0 + xOffset, -25.525126f + yOffset);
+ path->lineTo(-28.f + xOffset, 2.4748745f + yOffset);
+
+ path->close();
+
+ return SkIntToScalar(70);
+}
+
+static SkScalar make_curve(SkPath* path) {
+ static SkScalar xOffset = -382.f;
+ static SkScalar yOffset = -50.f;
+ path->moveTo(491 + xOffset, 56 + yOffset);
+ path->conicTo(435.93292f + xOffset, 56.000031f + yOffset,
+ 382.61078f + xOffset, 69.752716f + yOffset,
+ 0.9920463f);
+
+ return SkIntToScalar(40);
+}
+
+static SkScalar make_battery(SkPath* path) {
+ static SkScalar xOffset = 5.f;
+
+ path->moveTo(24.67f + xOffset, 0.33000004f);
+ path->lineTo(8.3299999f + xOffset, 0.33000004f);
+ path->lineTo(8.3299999f + xOffset, 5.3299999f);
+ path->lineTo(0.33000004f + xOffset, 5.3299999f);
+ path->lineTo(0.33000004f + xOffset, 50.669998f);
+ path->lineTo(32.669998f + xOffset, 50.669998f);
+ path->lineTo(32.669998f + xOffset, 5.3299999f);
+ path->lineTo(24.67f + xOffset, 5.3299999f);
+ path->lineTo(24.67f + xOffset, 0.33000004f);
+ path->close();
+
+ path->moveTo(25.727224f + xOffset, 12.886665f);
+ path->lineTo(10.907918f + xOffset, 12.886665f);
+ path->lineTo(7.5166659f + xOffset, 28.683645f);
+ path->lineTo(14.810181f + xOffset, 28.683645f);
+ path->lineTo(7.7024879f + xOffset, 46.135998f);
+ path->lineTo(28.049999f + xOffset, 25.136419f);
+ path->lineTo(16.854223f + xOffset, 25.136419f);
+ path->lineTo(25.727224f + xOffset, 12.886665f);
+ path->close();
+ return SkIntToScalar(70);
+}
+
+static SkScalar make_battery2(SkPath* path) {
+ static SkScalar xOffset = 5.f;
+
+ path->moveTo(32.669998f + xOffset, 9.8640003f);
+ path->lineTo(0.33000004f + xOffset, 9.8640003f);
+ path->lineTo(0.33000004f + xOffset, 50.669998f);
+ path->lineTo(32.669998f + xOffset, 50.669998f);
+ path->lineTo(32.669998f + xOffset, 9.8640003f);
+ path->close();
+
+ path->moveTo(10.907918f + xOffset, 12.886665f);
+ path->lineTo(25.727224f + xOffset, 12.886665f);
+ path->lineTo(16.854223f + xOffset, 25.136419f);
+ path->lineTo(28.049999f + xOffset, 25.136419f);
+ path->lineTo(7.7024879f + xOffset, 46.135998f);
+ path->lineTo(14.810181f + xOffset, 28.683645f);
+ path->lineTo(7.5166659f + xOffset, 28.683645f);
+ path->lineTo(10.907918f + xOffset, 12.886665f);
+ path->close();
+
+ return SkIntToScalar(70);
+}
+
+static const MakePathProc gProcs[] = {
+ make_triangle,
+ make_rect,
+ make_oval,
+ make_star_5,
+ make_star_13,
+ make_three_line,
+ make_arrow,
+ make_curve,
+ make_battery,
+ make_battery2
+};
+
+static const SkScalar gWidths[] = {
+ 2.0f,
+ 3.0f,
+ 4.0f,
+ 5.0f,
+ 6.0f,
+ 7.0f,
+ 7.0f,
+ 14.0f,
+ 0.0f,
+ 0.0f,
+};
+
+static const SkScalar gMiters[] = {
+ 2.0f,
+ 3.0f,
+ 3.0f,
+ 3.0f,
+ 4.0f,
+ 4.0f,
+ 4.0f,
+ 4.0f,
+ 4.0f,
+ 4.0f,
+};
+
+#define N SK_ARRAY_COUNT(gProcs)
+
+// This GM tests out drawing small paths (i.e., for Ganesh, using the Distance
+// Field path renderer) which are filled, stroked and filledAndStroked. In
+// particular this ensures that any cache keys in use include the stroking
+// parameters.
+class SmallPathsGM : public skiagm::GM {
+ SkPath fPath[N];
+ SkScalar fDY[N];
+protected:
+ void onOnceBeforeDraw() override {
+ for (size_t i = 0; i < N; i++) {
+ fDY[i] = gProcs[i](&fPath[i]);
+ }
+ }
+
+ SkString onShortName() override {
+ return SkString("smallpaths");
+ }
+
+ SkISize onISize() override {
+ return SkISize::Make(640, 480);
+ }
+
+ void onDraw(SkCanvas* canvas) override {
+ SkPaint paint;
+ paint.setAntiAlias(true);
+
+ // first column: filled paths
+ canvas->save();
+ for (size_t i = 0; i < N; i++) {
+ canvas->drawPath(fPath[i], paint);
+ canvas->translate(SkIntToScalar(0), fDY[i]);
+ }
+ canvas->restore();
+ canvas->translate(SkIntToScalar(120), SkIntToScalar(0));
+
+ // second column: stroked paths
+ canvas->save();
+ paint.setStyle(SkPaint::kStroke_Style);
+ paint.setStrokeCap(SkPaint::kButt_Cap);
+ for (size_t i = 0; i < N; i++) {
+ paint.setStrokeWidth(gWidths[i]);
+ paint.setStrokeMiter(gMiters[i]);
+ canvas->drawPath(fPath[i], paint);
+ canvas->translate(SkIntToScalar(0), fDY[i]);
+ }
+ canvas->restore();
+ canvas->translate(SkIntToScalar(120), SkIntToScalar(0));
+
+ // third column: stroked paths with different widths
+ canvas->save();
+ paint.setStyle(SkPaint::kStroke_Style);
+ paint.setStrokeCap(SkPaint::kButt_Cap);
+ for (size_t i = 0; i < N; i++) {
+ paint.setStrokeWidth(gWidths[i] + 2.0f);
+ paint.setStrokeMiter(gMiters[i]);
+ canvas->drawPath(fPath[i], paint);
+ canvas->translate(SkIntToScalar(0), fDY[i]);
+ }
+ canvas->restore();
+ canvas->translate(SkIntToScalar(120), SkIntToScalar(0));
+
+ // fourth column: stroked and filled paths
+ paint.setStyle(SkPaint::kStrokeAndFill_Style);
+ paint.setStrokeCap(SkPaint::kButt_Cap);
+ for (size_t i = 0; i < N; i++) {
+ paint.setStrokeWidth(gWidths[i]);
+ paint.setStrokeMiter(gMiters[i]);
+ canvas->drawPath(fPath[i], paint);
+ canvas->translate(SkIntToScalar(0), fDY[i]);
+ }
+
+ }
+
+private:
+ typedef skiagm::GM INHERITED;
+};
+
+DEF_GM(return new SmallPathsGM;)
+