J2ME图片缩放代码

public class ImageUtil {

public static Image ZoomImage(Image src, int desW, int desH) {

Image desImg = null;

int srcW = src.getWidth(); // 原始图像宽

int srcH = src.getHeight(); // 原始图像高

int[] srcBuf = new int[srcW * srcH]; // 原始图片像素信息缓存

src.getRGB(srcBuf, 0, srcW, 0, 0, srcW, srcH);

// 计算插值表

int[] tabY = new int[desH];

int[] tabX = new int[desW];

int sb = 0;

int db = 0;

int tems = 0;

int temd = 0;

int distance = srcH > desH ? srcH : desH;

for (int i = 0; i <= distance; i++) { /* 垂直方向 */

tabY[db] = sb;

tems += srcH;

temd += desH;

if (tems > 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; i++) { /* 水平方向 */

tabX[db] = (short) sb;

tems += srcW;

temd += desW;

if (tems > distance) {

tems -= distance;

sb++;

}

if (temd > distance) {

temd -= distance;

db++;

}

}

// 生成放大缩小后图形像素buf

int[] desBuf = new int[desW * desH];

int dx = 0;

int dy = 0;

int sy = 0;

int oldy = -1;

for (int i = 0; i < desH; i++) {

if (oldy == tabY[i]) {

System.arraycopy(desBuf, dy - desW, desBuf, dy, desW);

} else {

dx = 0;

for (int j = 0; j < desW; j++) {

desBuf[dy + dx] = srcBuf[sy + tabX[j]];

dx++;

}

sy += (tabY[i] - oldy) * srcW;

}

oldy = tabY[i];

dy += desW;

}

// 生成图片

desImg = Image.createRGBImage(desBuf, desW, desH, false);

return desImg;

}

}