Upstream CompositorButton, VirtualView and TitleBitmapFactory

chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/content/TitleBitmapFactory.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/content/TitleBitmapFactory.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/content/TitleBitmapFactory.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/content/TitleBitmapFactory.java
new file mode 100644
index 0000000000000000000000000000000000000000..dbf39e0adc8d9012b2d17235bc359b83babe5dcb
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/content/TitleBitmapFactory.java
@@ -0,0 +1,152 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.compositor.layouts.content;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Paint.FontMetrics;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
+import android.text.Layout;
+import android.text.TextPaint;
+import android.text.TextUtils;
+import android.util.FloatMath;
+import android.util.Log;
+import android.view.InflateException;
+
+import org.chromium.chrome.R;
+
+/**
+ * A factory that creates text and favicon bitmaps. This is only relevant for the phone tab
+ * switcher.
+ */
+public class TitleBitmapFactory {
+    private static final String TAG = "TitleBitmapFactory";
+
+    private static final float TITLE_WIDTH_PERCENTAGE = 1.f;
+
+    private final int mMaxWidth;
+    private final int mNullFaviconResourceId;
+
+    private final TextPaint mTextPaint;
+    private int mFaviconDimension;
+    private final int mViewHeight;
+    private final float mTextHeight;
+    private final float mTextYOffset;
+
+    /**
+     * @param context   The current Android's context.
+     * @param incognito Whether the title are for incognito mode.
+     * @param nullFaviconResourceId A drawable resource id of a default favicon.
+     */
+    public TitleBitmapFactory(Context context, boolean incognito, int nullFaviconResourceId) {
+        mNullFaviconResourceId = nullFaviconResourceId;
+
+        Resources res = context.getResources();
+        int textColor = res.getColor(incognito ? R.color.compositor_tab_title_bar_text_incognito
+                        : R.color.compositor_tab_title_bar_text);
+        int shadowColor = res.getColor(incognito ? R.color.compositor_tab_title_bar_shadow_incognito
+                        : R.color.compositor_tab_title_bar_shadow);
+        int shadowXOffset = res.getDimensionPixelOffset(incognito
+                        ? R.dimen.compositor_tab_title_bar_shadow_x_offset_incognito
+                        : R.dimen.compositor_tab_title_bar_shadow_x_offset);
+        int shadowYOffset = res.getDimensionPixelOffset(incognito
+                        ? R.dimen.compositor_tab_title_bar_shadow_y_offset_incognito
+                        : R.dimen.compositor_tab_title_bar_shadow_y_offset);
+        float textSize = res.getDimensionPixelSize(R.dimen.compositor_tab_title_text_size);
+        float adjustedTextSize = textSize * res.getConfiguration().fontScale;
+
+        boolean fakeBoldText = res.getBoolean(R.bool.compositor_tab_title_fake_bold_text);
+
+        mTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
+        mTextPaint.setColor(textColor);
+        if (shadowXOffset != 0 && shadowYOffset != 0) {
+            mTextPaint.setShadowLayer(0.001f, shadowXOffset, shadowYOffset, shadowColor);
+        }
+        mTextPaint.setTextSize(adjustedTextSize);
+        mTextPaint.setFakeBoldText(fakeBoldText);
+        mTextPaint.density = res.getDisplayMetrics().density;
+
+        FontMetrics textFontMetrics = mTextPaint.getFontMetrics();
+        mTextHeight = FloatMath.ceil(textFontMetrics.bottom - textFontMetrics.top);
+        mTextYOffset = -textFontMetrics.top;
+
+        mFaviconDimension = res.getDimensionPixelSize(R.dimen.compositor_tab_title_favicon_size);
+        mViewHeight = (int) Math.max(mFaviconDimension, mTextHeight);
+
+        int width = res.getDisplayMetrics().widthPixels;
+        int height = res.getDisplayMetrics().heightPixels;
+        mMaxWidth = (int) (TITLE_WIDTH_PERCENTAGE * Math.max(width, height));
+
+        // Set the favicon dimension here.
+        mFaviconDimension = Math.min(mMaxWidth, mFaviconDimension);
+    }
+
+    /**
+     * Generates the favicon bitmap.
+     *
+     * @param context   Android's UI context.
+     * @param favicon   The favicon of the tab.
+     * @return          The Bitmap with the favicon.
+     */
+    public Bitmap getFaviconBitmap(Context context, Bitmap favicon) {
+        try {
+            Bitmap b = Bitmap.createBitmap(
+                    mFaviconDimension, mFaviconDimension, Bitmap.Config.ARGB_8888);
+            Canvas c = new Canvas(b);
+            if (favicon == null) {
+                Drawable drawable = context.getResources().getDrawable(mNullFaviconResourceId);
+                if (drawable != null && drawable instanceof BitmapDrawable) {
+                    favicon = ((BitmapDrawable) drawable).getBitmap();
+                }
+            }
+            if (favicon != null) {
+                c.drawBitmap(favicon, Math.round((mFaviconDimension - favicon.getWidth()) / 2.0f),
+                        Math.round((mFaviconDimension - favicon.getHeight()) / 2.0f), null);
+            }
+            return b;
+        } catch (OutOfMemoryError ex) {
+            Log.w(TAG, "OutOfMemoryError while building favicon texture.");
+        } catch (InflateException ex) {
+            Log.w(TAG, "InflateException while building favicon texture.");
+        }
+
+        return null;
+    }
+
+    /**
+     * Generates the title bitmap.
+     *
+     * @param context   Android's UI context.
+     * @param title     The title of the tab.
+     * @return          The Bitmap with the title.
+     */
+    public Bitmap getTitleBitmap(Context context, String title) {
+        try {
+            boolean drawText = !TextUtils.isEmpty(title);
+            int textWidth =
+                    drawText ? (int) FloatMath.ceil(Layout.getDesiredWidth(title, mTextPaint)) : 0;
+            // Minimum 1 width bitmap to avoid createBitmap function's IllegalArgumentException,
+            // when textWidth == 0.
+            Bitmap b = Bitmap.createBitmap(Math.max(Math.min(mMaxWidth, textWidth), 1), mViewHeight,
+                    Bitmap.Config.ARGB_8888);
+            Canvas c = new Canvas(b);
+            if (drawText) {
+                c.drawText(title, 0, title.length(), 0,
+                        Math.round((mViewHeight - mTextHeight) / 2.0f + mTextYOffset), mTextPaint);
+            }
+            return b;
+        } catch (OutOfMemoryError ex) {
+            Log.w(TAG, "OutOfMemoryError while building title texture.");
+        } catch (InflateException ex) {
+            Log.w(TAG, "InflateException while building title texture.");
+        }
+
+        return null;
+    }
+}