經(jīng)典的圖像縮放

1、幾個(gè)經(jīng)典的圖像縮放的函數(shù)收集了幾個(gè)圖像縮放的函數(shù)，可能實(shí)現(xiàn)的方式很多，感覺這幾個(gè)不錯(cuò)的，分享下說明：以下函數(shù)都是基于MIDP2.0的，縮放后保留透明色。代碼1，函數(shù) resizeImagepublic static Image resizeImage(Image src, int destW, int destH) int srcW = src.getWidth(); int srcH = src.getHeight(); / create pixel arrays int destPixels = new intdestW * destH; / array to hold destinati

2、on / pixels int srcPixels = new intsrcW * srcH; / array with sources pixels src.getRGB(srcPixels, 0, srcW, 0, 0, srcW, srcH); / simple point smapled resizing / loop through the destination pixels, find the matching pixel on / the source and use that for (int destY = 0; destY destH; +destY) for (int

3、destX = 0; destX desH ? srcH : desH; for (int i = 0; i distance) tems -= distance; sb+; if (temd distance) temd -= distance; db+; sb = 0; db = 0; tems = 0; temd = 0; distance = srcW desW ? srcW : desW; for (int i = 0; i distance) tems -= distance; sb+; if (temd distance) temd -= distance; db+; / 生成放

4、大縮小后圖形像素buf int desBuf = new intdesW * desH; int dx = 0; int dy = 0; int sy = 0; int oldy = -1; for (int i = 0; i desH; i+) if (oldy = tabYi) System.arraycopy(desBuf, dy - desW, desBuf, dy, desW); else dx = 0; for (int j = 0; j 0; y-) for (int x = newWidth, XE = 0; x 0; x-) rawOutputoutOffset+ = raw

5、InputinOffset; inOffset += XD; XE += XR; if (XE = newWidth) XE -= newWidth; inOffset+; inOffset += YD; YE += YR; if (YE = newHeight) YE -= newHeight; inOffset += original.getWidth(); return Image.createRGBImage(rawOutput, newWidth, newHeight, true); 我將100*100的圖放大到200*200后對(duì)比了一下，ZoomImage生成的圖片和另外兩個(gè)函數(shù)生

6、成的圖像有點(diǎn)區(qū)別，感覺ZoomImage的效果好一點(diǎn)。再放大點(diǎn)就基本一樣了看不出區(qū)別了。代碼4 /*圖像變換*/ public Image scaleImage(Image src,int scales1,int scales2) return transImage(src,src.getWidth()*scales1/scales2,src.getHeight()*scales1/scales2); public Image transImage(Image src, int w, int h) int srcW = src.getWidth(); int srcH = src.getHei

7、ght(); int dstW=w,dstH=h; Image tmp = Image.createImage(dstW, srcH); Graphics g = tmp.getGraphics(); int scale=16; int delta = (srcW scale) / dstW;/掃描長(zhǎng)度 int pos = delta / 2;/掃描位置 for (int x = 0; x scale), 0, Graphics.LEFT | Graphics.TOP); pos += delta; Image dst = Image.createImage( dstW, dstH); g = dst.getGraphics(); delta = (srcH sca