// Copyright 2015 The Chromium Authors
// 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.os.SystemClock;
import android.text.Layout;
import android.text.TextPaint;
import android.text.TextUtils;
import android.util.Log;
import android.view.InflateException;
import androidx.annotation.ColorInt;
import androidx.appcompat.content.res.AppCompatResources;
import org.chromium.base.metrics.RecordHistogram;
import org.chromium.chrome.R;
import org.chromium.chrome.browser.flags.ChromeFeatureList;
import org.chromium.chrome.browser.tasks.tab_groups.TabGroupModelFilter;
import org.chromium.chrome.browser.tasks.tab_management.ColorPickerUtils;
import org.chromium.components.tab_groups.TabGroupColorId;
import org.chromium.ui.util.StyleUtils;
/** A factory that creates text and favicon bitmaps. */
public class TitleBitmapFactory {
private static final String TAG = "TitleBitmapFactory";
private static final float TITLE_WIDTH_PERCENTAGE = 1.f;
// Canvas#drawText() seems to fail when trying to draw 4100 or more characters.
// See https://crbug.com/524390/ for more details.
private static final int MAX_NUM_TITLE_CHAR = 1000;
// We were drawing up to 1000 characters, but only displaying ~30 in the tab strip. Experiment
// with a smaller limit.
private static final int SMALLER_MAX_NUM_TITLE_CHAR = 100;
private final int mMaxWidth;
private final int mViewHeight;
private int mFaviconDimension;
private boolean mIncognito;
private final TextPaint mTabTextPaint;
private final float mTabTextHeight;
private final float mTabTextYOffset;
private final TextPaint mGroupTextPaint;
private final int mGroupTextHeight;
private final float mGroupTextYOffset;
/**
* @param context The current Android's context.
* @param incognito Whether the title are for incognito mode.
*/
public TitleBitmapFactory(Context context, boolean incognito) {
Resources res = context.getResources();
mIncognito = incognito;
boolean fakeBoldText = res.getBoolean(R.bool.compositor_tab_title_fake_bold_text);
mTabTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
if (mIncognito) {
int incognitoTabTextColor =
AppCompatResources.getColorStateList(
context, R.color.compositor_tab_title_bar_text_incognito)
.getDefaultColor();
mTabTextPaint.setColor(incognitoTabTextColor);
}
StyleUtils.applyTextAppearanceToTextPaint(
context,
mTabTextPaint,
R.style.TextAppearance_TextMedium_Primary,
/* applyFontFamily= */ true,
/* applyTextSize= */ true,
!mIncognito);
mTabTextPaint.setFakeBoldText(fakeBoldText);
mTabTextPaint.density = res.getDisplayMetrics().density;
FontMetrics tabTextFontMetrics = mTabTextPaint.getFontMetrics();
mTabTextHeight = (float) Math.ceil(tabTextFontMetrics.bottom - tabTextFontMetrics.top);
mTabTextYOffset = -tabTextFontMetrics.top;
mGroupTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
StyleUtils.applyTextAppearanceToTextPaint(
context,
mGroupTextPaint,
R.style.TextAppearance_TextSmall,
/* applyFontFamily */ true,
/* applyTextSize= */ true,
/* applyTextColor= */ false);
mGroupTextPaint.setFakeBoldText(fakeBoldText);
mGroupTextPaint.density = res.getDisplayMetrics().density;
FontMetrics groupTextFontMetrics = mGroupTextPaint.getFontMetrics();
mGroupTextHeight = (int) Math.ceil(groupTextFontMetrics.bottom - groupTextFontMetrics.top);
mGroupTextYOffset = -groupTextFontMetrics.top;
mFaviconDimension = res.getDimensionPixelSize(R.dimen.compositor_tab_title_favicon_size);
mViewHeight = (int) Math.max(mFaviconDimension, mTabTextHeight);
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 favicon The favicon of the tab.
* @return The Bitmap with the favicon.
*/
public Bitmap getFaviconBitmap(Bitmap favicon) {
assert favicon != null;
try {
Bitmap b =
Bitmap.createBitmap(
mFaviconDimension, mFaviconDimension, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
if (favicon.getWidth() > mFaviconDimension || favicon.getHeight() > mFaviconDimension) {
float scale =
(float) mFaviconDimension
/ Math.max(favicon.getWidth(), favicon.getHeight());
c.scale(scale, scale);
} else {
c.translate(
Math.round((mFaviconDimension - favicon.getWidth()) / 2.0f),
Math.round((mFaviconDimension - favicon.getHeight()) / 2.0f));
}
c.drawBitmap(favicon, 0, 0, null);
return b;
} catch (OutOfMemoryError ex) {
Log.e(TAG, "OutOfMemoryError while building favicon texture.");
} catch (InflateException ex) {
Log.w(TAG, "InflateException while building favicon texture.");
}
return null;
}
/**
* Generates the tab title bitmap.
*
* @param title The title of the group.
* @return The Bitmap with the title.
*/
public Bitmap getTabTitleBitmap(String title) {
return getTitleBitmap(mTabTextPaint, mTabTextHeight, mTabTextYOffset, title);
}
/**
* Generates the group title bitmap.
*
* @param filter To fetch tab information from.
* @param context The current Android's context.
* @param rootId The root ID of the group.
* @param title The title of the group.
* @return The Bitmap with the title.
*/
public Bitmap getGroupTitleBitmap(
TabGroupModelFilter filter, Context context, int rootId, String title) {
@TabGroupColorId int colorId = filter.getTabGroupColor(rootId);
@ColorInt
int color =
ColorPickerUtils.getTabGroupColorPickerItemTextColor(context, colorId, mIncognito);
mGroupTextPaint.setColor(color);
return getTitleBitmap(mGroupTextPaint, mGroupTextHeight, mGroupTextYOffset, title);
}
/**
* Generates a title bitmap.
*
* @param textPaint The TextPaint used to create the title bitmap.
* @param height The height of the title.
* @param yOffset The y-offset of the title.
* @param title The title of the tab.
* @return The Bitmap with the title.
*/
public Bitmap getTitleBitmap(TextPaint textPaint, float height, float yOffset, String title) {
try {
final long startTime = SystemClock.elapsedRealtime();
boolean drawText = !TextUtils.isEmpty(title);
int textWidth = drawText ? getTitleWidth(title, textPaint) : 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) {
final int maxCharsToDraw =
ChromeFeatureList.sSmallerTabStripTitleLimit.isEnabled()
? SMALLER_MAX_NUM_TITLE_CHAR
: MAX_NUM_TITLE_CHAR;
RecordHistogram.recordCount100Histogram(
"Android.TabStrip.TitleBitmapFactory.getTitleBitmap.Length",
title.length());
c.drawText(
title,
0,
Math.min(maxCharsToDraw, title.length()),
0,
Math.round((mViewHeight - height) / 2.0f + yOffset),
textPaint);
}
RecordHistogram.recordTimesHistogram(
"Android.TabStrip.TitleBitmapFactory.getTitleBitmap.Duration",
SystemClock.elapsedRealtime() - startTime);
return b;
} catch (OutOfMemoryError ex) {
Log.e(TAG, "OutOfMemoryError while building title texture.");
} catch (InflateException ex) {
Log.w(TAG, "InflateException while building title texture.");
}
return null;
}
/**
* @param titleString The title of the tab group.
* @return The width in px of the title.
*/
public int getGroupTitleWidth(String titleString) {
return getTitleWidth(titleString, mGroupTextPaint);
}
private int getTitleWidth(String titleString, TextPaint textPaint) {
return (int) Math.ceil(Layout.getDesiredWidth(titleString, textPaint));
}
}
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