original

[gb-231r1-is01/GB_2.3_IS01.git] / cts / tests / tests / graphics / src / android / graphics / cts / DiscretePathEffectTest.java

diff --git a/cts/tests/tests/graphics/src/android/graphics/cts/DiscretePathEffectTest.java b/cts/tests/tests/graphics/src/android/graphics/cts/DiscretePathEffectTest.java
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+++ b/cts/tests/tests/graphics/src/android/graphics/cts/DiscretePathEffectTest.java
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.graphics.cts;
+
+import dalvik.annotation.TestLevel;
+import dalvik.annotation.TestTargetClass;
+import dalvik.annotation.TestTargetNew;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.DiscretePathEffect;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.PorterDuffXfermode;
+import android.graphics.Bitmap.Config;
+import android.graphics.Paint.Style;
+import android.graphics.PorterDuff.Mode;
+
+import junit.framework.TestCase;
+
+@TestTargetClass(DiscretePathEffect.class)
+public class DiscretePathEffectTest extends TestCase {
+    private static final int BITMAP_WIDTH = 200;
+    private static final int BITMAP_HEIGHT = 100;
+    private static final int START_X = 10;
+    private static final int END_X = BITMAP_WIDTH - START_X;
+    private static final int COORD_Y = BITMAP_HEIGHT / 2;
+    private static final int SEGMENT_LENGTH = 10; // must be < BITMAP_WIDTH
+    private static final int DEVIATION = 10; // must be < BITMAP_HEIGHT
+
+    @TestTargetNew(
+        level = TestLevel.COMPLETE,
+        method = "DiscretePathEffect",
+        args = {float.class, float.class}
+    )
+    public void testDiscretePathEffect() {
+        DiscretePathEffect effect = new DiscretePathEffect(SEGMENT_LENGTH, DEVIATION);
+
+        Paint paint = new Paint();
+        paint.setColor(Color.GREEN);
+        paint.setStyle(Style.STROKE);
+        paint.setStrokeWidth(0);
+        paint.setPathEffect(effect);
+
+        Path path = new Path();
+        path.moveTo(START_X, COORD_Y);
+        path.lineTo(END_X, COORD_Y);
+
+        Bitmap bitmap = Bitmap.createBitmap(BITMAP_WIDTH, BITMAP_HEIGHT, Config.ARGB_8888);
+        bitmap.eraseColor(Color.TRANSPARENT);
+
+        Canvas canvas = new Canvas(bitmap);
+        canvas.drawPath(path, paint);
+
+        // draw guide line into red channel (each segment should cross this once)
+        paint = new Paint();
+        paint.setColor(Color.RED);
+        paint.setStyle(Style.STROKE);
+        paint.setStrokeWidth(0);
+        paint.setXfermode(new PorterDuffXfermode(Mode.SCREEN));
+        canvas.drawPath(path, paint);
+
+        // draw guide rectangle into blue channel (each segment must be completely inside this)
+        paint.setColor(Color.BLUE);
+        paint.setStrokeWidth(1 + 2 * DEVIATION);
+        canvas.drawPath(path, paint);
+
+        int intersect = 0;
+        int numGreenPixels = 0;
+        int minY = BITMAP_HEIGHT;
+        int maxY = 0;
+        for (int y = 0; y < BITMAP_HEIGHT; y++) {
+            for (int x = 0; x < BITMAP_WIDTH; x++) {
+                int pixel = bitmap.getPixel(x, y);
+                if (Color.green(pixel) > 0) {
+                    numGreenPixels += 1;
+                    minY = Math.min(minY, y);
+                    maxY = Math.max(maxY, y);
+                    assertEquals(0xFF, Color.blue(pixel));
+                    if (Color.red(pixel) > 0) {
+                        intersect += 1;
+                    }
+                }
+            }
+        }
+        int lineLength = END_X - START_X;
+        // the number of pixels in all segments must be at least the same as the line length
+        assertTrue(numGreenPixels >= lineLength);
+        // green line must vary in y direction
+        assertTrue(maxY - minY > 0);
+        // ... but not too much
+        assertTrue(maxY - minY <= 1 + 2 * DEVIATION);
+        // intersecting pixels must be less than line length, otherwise deviation doesn't work
+        assertTrue(intersect < lineLength);
+        // there must be at least as many intersecting pixels as there are full segments
+        assertTrue(intersect >= lineLength / SEGMENT_LENGTH);
+    }
+}