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/*
* Copyright (C) 2013 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.gallery3d.filtershow.tools;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
/**
* A factory class for producing bitmaps to use as UI icons.
*/
public class IconFactory {
/**
* Builds an icon with the dimensions iconWidth:iconHeight. If scale is set
* the source image is stretched to fit within the given dimensions;
* otherwise, the source image is cropped to the proper aspect ratio.
*
* @param sourceImage image to create an icon from.
* @param iconWidth width of the icon bitmap.
* @param iconHeight height of the icon bitmap.
* @param scale if true, stretch sourceImage to fit the icon dimensions.
* @return an icon bitmap with the dimensions iconWidth:iconHeight.
*/
public static Bitmap createIcon(Bitmap sourceImage, int iconWidth, int iconHeight,
boolean scale) {
if (sourceImage == null) {
throw new IllegalArgumentException("Null argument to buildIcon");
}
int sourceWidth = sourceImage.getWidth();
int sourceHeight = sourceImage.getHeight();
if (sourceWidth == 0 || sourceHeight == 0 || iconWidth == 0 || iconHeight == 0) {
throw new IllegalArgumentException("Bitmap with dimension 0 used as input");
}
Bitmap icon = Bitmap.createBitmap(iconWidth, iconHeight,
Bitmap.Config.ARGB_8888);
drawIcon(icon, sourceImage, scale);
return icon;
}
/**
* Draws an icon in the destination bitmap. If scale is set the source image
* is stretched to fit within the destination dimensions; otherwise, the
* source image is cropped to the proper aspect ratio.
*
* @param dest bitmap into which to draw the icon.
* @param sourceImage image to create an icon from.
* @param scale if true, stretch sourceImage to fit the destination.
*/
public static void drawIcon(Bitmap dest, Bitmap sourceImage, boolean scale) {
if (dest == null || sourceImage == null) {
throw new IllegalArgumentException("Null argument to buildIcon");
}
int sourceWidth = sourceImage.getWidth();
int sourceHeight = sourceImage.getHeight();
int iconWidth = dest.getWidth();
int iconHeight = dest.getHeight();
if (sourceWidth == 0 || sourceHeight == 0 || iconWidth == 0 || iconHeight == 0) {
throw new IllegalArgumentException("Bitmap with dimension 0 used as input");
}
Rect destRect = new Rect(0, 0, iconWidth, iconHeight);
Canvas canvas = new Canvas(dest);
Rect srcRect = null;
if (scale) {
// scale image to fit in icon (stretches if aspect isn't the same)
srcRect = new Rect(0, 0, sourceWidth, sourceHeight);
} else {
// crop image to aspect ratio iconWidth:iconHeight
float wScale = sourceWidth / (float) iconWidth;
float hScale = sourceHeight / (float) iconHeight;
float s = Math.min(hScale, wScale);
float iw = iconWidth * s;
float ih = iconHeight * s;
float borderW = (sourceWidth - iw) / 2.0f;
float borderH = (sourceHeight - ih) / 2.0f;
RectF rec = new RectF(borderW, borderH, borderW + iw, borderH + ih);
srcRect = new Rect();
rec.roundOut(srcRect);
}
canvas.drawBitmap(sourceImage, srcRect, destRect, new Paint(Paint.FILTER_BITMAP_FLAG));
}
}
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