Use Harfbuzz instead of ICU4C for computing advances

- use Harfbuzz shaper for shaping and getting glyphs
- add test app for showing result of drawText() and drawGlyphs()
- add private API in Canvas and Paint for test app

Change-Id: Ia15be216f8636d2d864066e9b7de2f53008c30f6

7 files changed, 380 insertions, 0 deletions

diff --git a/tests/BiDiTests/Android.mk b/tests/BiDiTests/Android.mk
new file mode 100644
index 0000000..ae29fc2
--- /dev/null
+++ b/tests/BiDiTests/Android.mk
@@ -0,0 +1,27 @@
+# Copyright (C) 2011 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.
+
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_MODULE_TAGS := tests
+
+# Only compile source java files in this apk.
+LOCAL_SRC_FILES := $(call all-java-files-under, src)
+
+LOCAL_PACKAGE_NAME := BiDiTests
+
+LOCAL_PROGUARD_FLAG_FILES := proguard.flags
+
+include $(BUILD_PACKAGE)
\ No newline at end of file
diff --git a/tests/BiDiTests/AndroidManifest.xml b/tests/BiDiTests/AndroidManifest.xml
new file mode 100644
index 0000000..346ace8
--- /dev/null
+++ b/tests/BiDiTests/AndroidManifest.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2011 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.
+-->
+
+<!-- Declare the contents of this Android application.  The namespace
+     attribute brings in the Android platform namespace, and the package
+     supplies a unique name for the application.  When writing your
+     own application, the package name must be changed from "com.example.*"
+     to come from a domain that you own or have control over. -->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.bidi"
+    android:versionCode="1"
+    android:versionName="1.0">
+
+    <application android:label="BiDiTests">
+        <activity android:name="BiDiTestActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+    </application>
+</manifest>
\ No newline at end of file
diff --git a/tests/BiDiTests/proguard.flags b/tests/BiDiTests/proguard.flags
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/BiDiTests/proguard.flags
diff --git a/tests/BiDiTests/res/layout/biditest_main.xml b/tests/BiDiTests/res/layout/biditest_main.xml
new file mode 100644
index 0000000..9f77ad2
--- /dev/null
+++ b/tests/BiDiTests/res/layout/biditest_main.xml
@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2011 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.
+-->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+        android:orientation="horizontal"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+       <Button android:id="@+id/button"
+               android:layout_height="wrap_content"
+               android:layout_width="wrap_content"
+               android:onClick="onButtonClick"
+               android:text="@string/button_text"
+               android:textSize="32dip"
+        />
+
+        <TextView android:id="@+id/textview"
+                  android:layout_height="wrap_content"
+                  android:layout_width="wrap_content"
+                  android:textSize="32dip"
+                  android:text="@string/textview_text"
+        />
+
+        <EditText android:id="@+id/textview"
+                  android:layout_height="wrap_content"
+                  android:layout_width="match_parent"
+                  android:textSize="32dip"
+                  android:text="@string/edittext_text"
+        />
+
+    </LinearLayout>
+
+    <view class="com.android.bidi.BiDiTestView"
+        android:id="@+id/main"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:background="#FF0000"
+    />
+
+</LinearLayout>
\ No newline at end of file
diff --git a/tests/BiDiTests/res/values/strings.xml b/tests/BiDiTests/res/values/strings.xml
new file mode 100644
index 0000000..ecff76e
--- /dev/null
+++ b/tests/BiDiTests/res/values/strings.xml
@@ -0,0 +1,26 @@
+<!-- Copyright (C) 2011 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.
+-->
+<resources>
+    <string name="button_text">Button</string>
+    <string name="textview_text">This is a text for a TextView</string>
+    <string name="edittext_text">mmmmmmmmmmmmmmmmmmmmmmmm</string>
+    <string name="normal_text">Normal String</string>
+    <string name="normal_long_text">mmmmmmmmmmmmmmmmmmmmmmmm</string>
+    <string name="arabic_text">&#x0644;&#x0627;</string>
+    <string name="chinese_text">利比亚局势或影响美俄关系发展</string>
+    <string name="italic_text">Italic String</string>
+    <string name="bold_text">Bold String</string>
+    <string name="bold_italic_text">Bold Italic String</string>
+</resources>
\ No newline at end of file
diff --git a/tests/BiDiTests/src/com/android/bidi/BiDiTestActivity.java b/tests/BiDiTests/src/com/android/bidi/BiDiTestActivity.java
new file mode 100644
index 0000000..3d7dd81
--- /dev/null
+++ b/tests/BiDiTests/src/com/android/bidi/BiDiTestActivity.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2011 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 com.android.bidi;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+
+public class BiDiTestActivity extends Activity {
+
+    static final String TAG = "BiDiTestActivity";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        setContentView(R.layout.biditest_main);
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+    }
+
+    public void onButtonClick(View v) {
+        Log.v(TAG, "onButtonClick");
+    }
+}
\ No newline at end of file
diff --git a/tests/BiDiTests/src/com/android/bidi/BiDiTestView.java b/tests/BiDiTests/src/com/android/bidi/BiDiTestView.java
new file mode 100644
index 0000000..e9b6fa6
--- /dev/null
+++ b/tests/BiDiTests/src/com/android/bidi/BiDiTestView.java
@@ -0,0 +1,190 @@
+/*
+ * Copyright (C) 2011 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 com.android.bidi;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Rect;
+import android.graphics.Typeface;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.View;
+
+public class BiDiTestView extends View {
+
+    private static final String TAG = "BiDiTestView";
+
+    private static final int BORDER_PADDING = 4;
+    private static final int TEXT_PADDING = 16;
+    private static final int TEXT_SIZE = 32;
+    private static final int ORIGIN = 48;
+    private static final int DELTA_Y = TEXT_SIZE;
+
+    private static final float DEFAULT_ITALIC_SKEW_X = -0.25f;
+
+    private Paint paint = new Paint();
+    private Rect rect = new Rect();
+
+    private String NORMAL_TEXT;
+    private String NORMAL_LONG_TEXT;
+    private String ITALIC_TEXT;
+    private String BOLD_TEXT;
+    private String BOLD_ITALIC_TEXT;
+    private String ARABIC_TEXT;
+    private String CHINESE_TEXT;
+
+    private Typeface typeface;
+
+    public BiDiTestView(Context context) {
+        super(context);
+        init(context);
+    }
+
+    public BiDiTestView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context);
+    }
+
+    public BiDiTestView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        init(context);
+    }
+
+    private void init(Context context) {
+        NORMAL_TEXT = context.getString(R.string.normal_text);
+        NORMAL_LONG_TEXT = context.getString(R.string.normal_long_text);
+        ITALIC_TEXT = context.getString(R.string.italic_text);
+        BOLD_TEXT = context.getString(R.string.bold_text);
+        BOLD_ITALIC_TEXT = context.getString(R.string.bold_italic_text);
+        ARABIC_TEXT = context.getString(R.string.arabic_text);
+        CHINESE_TEXT = context.getString(R.string.chinese_text);
+
+        typeface = paint.getTypeface();
+        paint.setAntiAlias(true);
+    }
+
+    @Override
+    public void onDraw(Canvas canvas) {
+        drawInsideRect(canvas, Color.BLACK);
+
+        int deltaX = testString(canvas, NORMAL_TEXT, ORIGIN, ORIGIN, paint, typeface,
+                false, false,  Paint.DIRECTION_LTR);
+        deltaX += testString(canvas, ITALIC_TEXT, ORIGIN + deltaX, ORIGIN, paint, typeface,
+                true, false,  Paint.DIRECTION_LTR);
+        deltaX += testString(canvas, BOLD_TEXT, ORIGIN + deltaX, ORIGIN, paint, typeface,
+                false, true,  Paint.DIRECTION_LTR);
+        deltaX += testString(canvas, BOLD_ITALIC_TEXT, ORIGIN + deltaX, ORIGIN, paint, typeface,
+                true, true,  Paint.DIRECTION_LTR);
+
+        // Test with a long string
+        deltaX = testString(canvas, NORMAL_LONG_TEXT, ORIGIN, ORIGIN + 2 * DELTA_Y, paint, typeface,
+                false, false,  Paint.DIRECTION_LTR);
+
+        // Test Arabic ligature
+        deltaX = testString(canvas, ARABIC_TEXT, ORIGIN, ORIGIN + 4 * DELTA_Y, paint, typeface,
+                false, false,  Paint.DIRECTION_RTL);
+
+        // Test Chinese
+        deltaX = testString(canvas, CHINESE_TEXT, ORIGIN, ORIGIN + 6 * DELTA_Y, paint, typeface,
+                false, false,  Paint.DIRECTION_LTR);
+    }
+
+    private int testString(Canvas canvas, String text, int x, int y, Paint paint, Typeface typeface,
+            boolean isItalic, boolean isBold, int dir) {
+        paint.setTypeface(typeface);
+
+        // Set paint properties
+        boolean oldFakeBold = paint.isFakeBoldText();
+        paint.setFakeBoldText(isBold);
+
+        float oldTextSkewX = paint.getTextSkewX();
+        if (isItalic) {
+            paint.setTextSkewX(DEFAULT_ITALIC_SKEW_X);
+        }
+
+        drawTextWithCanvasDrawText(text, canvas, x, y, TEXT_SIZE, Color.WHITE);
+
+        int length = text.length();
+        float[] advances = new float[length];
+        float textWidth = paint.getTextRunAdvances(text, 0, length, 0, length, 0, advances, 0);
+
+        logAdvances(text, textWidth, advances);
+        drawBoxAroundText(canvas, x, y, textWidth, TEXT_SIZE, Color.RED);
+
+        paint.setColor(Color.WHITE);
+        char[] glyphs = new char[2*length];
+        int count = getGlyphs(text, glyphs, dir);
+
+        logGlypths(glyphs, count);
+        drawTextWithDrawGlyph(canvas, glyphs, count, x, y + DELTA_Y);
+
+        // Restore old paint properties
+        paint.setFakeBoldText(oldFakeBold);
+        paint.setTextSkewX(oldTextSkewX);
+
+        return (int) Math.ceil(textWidth) + TEXT_PADDING;
+    }
+
+    private void drawTextWithDrawGlyph(Canvas canvas, char[] glyphs, int count, int x, int y) {
+        canvas.drawGlyphs(glyphs, 0, count, x, y, paint);
+    }
+
+    private void logGlypths(char[] glyphs, int count) {
+        Log.v(TAG, "GlyphIds - count=" + count);
+        for (int n = 0; n < count; n++) {
+            Log.v(TAG, "GlyphIds - Id[" + n + "]="+ (int)glyphs[n]);
+        }
+    }
+
+    private int getGlyphs(String text, char[] glyphs, int dir) {
+//        int dir = 1; // Paint.DIRECTION_LTR;
+        return paint.getTextGlypths(text, 0, text.length(), 0, text.length(), dir, glyphs);
+    }
+
+    private void drawInsideRect(Canvas canvas, int color) {
+        paint.setColor(color);
+        int width = getWidth();
+        int height = getHeight();
+        rect.set(BORDER_PADDING, BORDER_PADDING, width - BORDER_PADDING, height - BORDER_PADDING);
+        canvas.drawRect(rect, paint);
+    }
+
+    private void drawTextWithCanvasDrawText(String text, Canvas canvas,
+            float x, float y, float textSize, int color) {
+        paint.setColor(color);
+        paint.setTextSize(textSize);
+        canvas.drawText(text, x, y, paint);
+    }
+
+    private void drawBoxAroundText(Canvas canvas, int x, int y, float textWidth, int textSize,
+            int color) {
+        paint.setColor(color);
+        canvas.drawLine(x, y - textSize, x, y + 8, paint);
+        canvas.drawLine(x, y + 8, x + textWidth, y + 8, paint);
+        canvas.drawLine(x + textWidth, y - textSize, x + textWidth, y + 8, paint);
+    }
+
+    private void logAdvances(String text, float textWidth, float[] advances) {
+        Log.v(TAG, "Advances for text: " + text + " total=" + textWidth);
+        int length = advances.length;
+        for(int n=0; n<length; n++){
+            Log.v(TAG, "adv[" + n + "]=" + advances[n]);
+        }
+    }
+}