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/*******************************************************************************
* Copyright 2013-2014 Sergey Tarasevich
*
* 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.nostra13.universalimageloader.utils;
import android.graphics.BitmapFactory;
import android.opengl.GLES10;
import com.nostra13.universalimageloader.core.assist.ImageSize;
import com.nostra13.universalimageloader.core.assist.ViewScaleType;
import com.nostra13.universalimageloader.core.imageaware.ImageAware;
import javax.microedition.khronos.opengles.GL10;
/**
* Provides calculations with image sizes, scales
*
* @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
* @since 1.8.3
*/
public final class ImageSizeUtils {
private static final int DEFAULT_MAX_BITMAP_DIMENSION = 2048;
private static ImageSize maxBitmapSize;
static {
int[] maxTextureSize = new int[1];
GLES10.glGetIntegerv(GL10.GL_MAX_TEXTURE_SIZE, maxTextureSize, 0);
int maxBitmapDimension = Math.max(maxTextureSize[0], DEFAULT_MAX_BITMAP_DIMENSION);
maxBitmapSize = new ImageSize(maxBitmapDimension, maxBitmapDimension);
}
private ImageSizeUtils() {
}
/**
* Defines target size for image aware view. Size is defined by target
* {@link com.nostra13.universalimageloader.core.imageaware.ImageAware view} parameters, configuration
* parameters or device display dimensions.
*/
public static ImageSize defineTargetSizeForView(ImageAware imageAware, ImageSize maxImageSize) {
int width = imageAware.getWidth();
if (width <= 0) width = maxImageSize.getWidth();
int height = imageAware.getHeight();
if (height <= 0) height = maxImageSize.getHeight();
return new ImageSize(width, height);
}
/**
* Computes sample size for downscaling image size (srcSize) to view size (targetSize). This sample
* size is used during
* {@linkplain BitmapFactory#decodeStream(java.io.InputStream, android.graphics.Rect, android.graphics.BitmapFactory.Options)
* decoding image} to bitmap.
*
* Examples:
*
*
*
*
* The sample size is the number of pixels in either dimension that correspond to a single pixel in the decoded
* bitmap. For example, inSampleSize == 4 returns an image that is 1/4 the width/height of the original, and 1/16
* the number of pixels. Any value <= 1 is treated the same as 1.
*
* @param srcSize Original (image) size
* @param targetSize Target (view) size
* @param viewScaleType {@linkplain ViewScaleType Scale type} for placing image in view
* @param powerOf2Scale true - if sample size be a power of 2 (1, 2, 4, 8, ...)
* @return Computed sample size
*/
public static int computeImageSampleSize(ImageSize srcSize, ImageSize targetSize, ViewScaleType viewScaleType,
boolean powerOf2Scale) {
final int srcWidth = srcSize.getWidth();
final int srcHeight = srcSize.getHeight();
final int targetWidth = targetSize.getWidth();
final int targetHeight = targetSize.getHeight();
int scale = 1;
switch (viewScaleType) {
case FIT_INSIDE:
if (powerOf2Scale) {
final int halfWidth = srcWidth / 2;
final int halfHeight = srcHeight / 2;
while ((halfWidth / scale) > targetWidth || (halfHeight / scale) > targetHeight) { // ||
scale *= 2;
}
} else {
scale = Math.max(srcWidth / targetWidth, srcHeight / targetHeight); // max
}
break;
case CROP:
if (powerOf2Scale) {
final int halfWidth = srcWidth / 2;
final int halfHeight = srcHeight / 2;
while ((halfWidth / scale) > targetWidth && (halfHeight / scale) > targetHeight) { // &&
scale *= 2;
}
} else {
scale = Math.min(srcWidth / targetWidth, srcHeight / targetHeight); // min
}
break;
}
if (scale < 1) {
scale = 1;
}
scale = considerMaxTextureSize(srcWidth, srcHeight, scale, powerOf2Scale);
return scale;
}
private static int considerMaxTextureSize(int srcWidth, int srcHeight, int scale, boolean powerOf2) {
final int maxWidth = maxBitmapSize.getWidth();
final int maxHeight = maxBitmapSize.getHeight();
while ((srcWidth / scale) > maxWidth || (srcHeight / scale) > maxHeight) {
if (powerOf2) {
scale *= 2;
} else {
scale++;
}
}
return scale;
}
/**
* Computes minimal sample size for downscaling image so result image size won't exceed max acceptable OpenGL
* texture size.
* We can't create Bitmap in memory with size exceed max texture size (usually this is 2048x2048) so this method
* calculate minimal sample size which should be applied to image to fit into these limits.
*
* @param srcSize Original image size
* @return Minimal sample size
*/
public static int computeMinImageSampleSize(ImageSize srcSize) {
final int srcWidth = srcSize.getWidth();
final int srcHeight = srcSize.getHeight();
final int targetWidth = maxBitmapSize.getWidth();
final int targetHeight = maxBitmapSize.getHeight();
final int widthScale = (int) Math.ceil((float) srcWidth / targetWidth);
final int heightScale = (int) Math.ceil((float) srcHeight / targetHeight);
return Math.max(widthScale, heightScale); // max
}
/**
* Computes scale of target size (targetSize) to source size (srcSize).
*
* Examples:
*
*
