com.alibaba.simpleimage.util
类 ImageScaleHelper

java.lang.Object
  com.alibaba.simpleimage.util.ImageScaleHelper

public class ImageScaleHelper
extends Object

构造方法摘要

ImageScaleHelper()

方法摘要

static PlanarImage	autoScaleImage(PlanarImage input, double scale)
static PlanarImage	bicubicScaleImage(PlanarImage input, float scale, int alg)
static double	computeDoubleScale(int w, int h, ScaleParameter zoom)
static float	computeFloatScale(int w, int h, ScaleParameter zoom)
static PlanarImage	lanczosScaleImage(PlanarImage input, double scale)
static PlanarImage	progressiveScaleImage(PlanarImage input, int targetWidth, int targetHeight, Object hint, boolean progressive) 已过时。
static PlanarImage	scale(PlanarImage input, ScaleParameter zoom)
static ImageWrapper	scaleGIF(ImageWrapper imgWrapper, ScaleParameter zoom)
static PlanarImage	subsampleavgScaleImage(PlanarImage input, double scale)

从类 java.lang.Object 继承的方法

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造方法详细信息

ImageScaleHelper

public ImageScaleHelper()

方法详细信息

scaleGIF

public static ImageWrapper scaleGIF(ImageWrapper imgWrapper,
                                    ScaleParameter zoom)
                             throws SimpleImageException

抛出：

SimpleImageException

scale

public static PlanarImage scale(PlanarImage input,
                                ScaleParameter zoom)

computeFloatScale

public static float computeFloatScale(int w,
                                      int h,
                                      ScaleParameter zoom)

computeDoubleScale

public static double computeDoubleScale(int w,
                                        int h,
                                        ScaleParameter zoom)

bicubicScaleImage

public static PlanarImage bicubicScaleImage(PlanarImage input,
                                            float scale,
                                            int alg)

subsampleavgScaleImage

public static PlanarImage subsampleavgScaleImage(PlanarImage input,
                                                 double scale)

lanczosScaleImage

public static PlanarImage lanczosScaleImage(PlanarImage input,
                                            double scale)

autoScaleImage

public static PlanarImage autoScaleImage(PlanarImage input,
                                         double scale)

progressiveScaleImage

@Deprecated
public static PlanarImage progressiveScaleImage(PlanarImage input,
                                                           int targetWidth,
                                                           int targetHeight,
                                                           Object hint,
                                                           boolean progressive)

已过时。

折半渐进压缩图片方法 测试后觉得效果不太理想，不鼓励使用

参数：

img -

targetWidth -

targetHeight -

hint -

progressiveBilinear -

返回：