j2me 图片的缩放 图片的过滤
当时记得也是从网上搜半天,找到一个能缩放图片的算法实现,还有将选中的图片改变显示,用其它颜色过滤一下.代码如下:import javax.microedition.lcdui.Image;
public class GraphicsUtil {
public static final int SHIFT_RED_TO_GREEN = 0;
public static final int SHIFT_RED_TO_BLUE = 1;
public static final int SHIFT_GREEN_TO_BLUE = 2;
public static final int SHIFT_GREEN_TO_RED = 3;
public static final int SHIFT_BLUE_TO_RED = 4;
public static final int SHIFT_BLUE_TO_GREEN = 5;
public static int[] flipImageColor(int[] rgbData, int shiftType) {
// we start by getting the image data into an int array - the number
// of 32-bit ints is equal to the width multiplied by the height
// now go through every pixel and adjust it\'s color
for (int i = 0; i < rgbData.length; i++) {
int p = rgbData[i];
// split out the different byte components of the pixel by
// applying
// a mask so we only get what we need, then shift it to make it
// a normal number we can play around with
int a = ((p & 0xff000000) >> 24);
int r = ((p & 0x00ff0000) >> 16);
int g = ((p & 0x0000ff00) >> 8);
int b = ((p & 0x000000ff) >> 0);
int ba = a, br = r, bb = b, bg = g; // backup copies
// flip the colors around according to the operation required
switch (shiftType) {
case SHIFT_RED_TO_GREEN:
g = r;
r = bg;
break;
case SHIFT_RED_TO_BLUE:
b = r;
r = bb;
break;
case SHIFT_GREEN_TO_BLUE:
g = b;
b = bg;
break;
case SHIFT_GREEN_TO_RED:
g = r;
r = bg;
break;
case SHIFT_BLUE_TO_RED:
b = r;
r = bb;
break;
case SHIFT_BLUE_TO_GREEN:
b = g;
g = bb;
break;
}
// shift all our values back in
rgbData[i] = (a << 24) | (r << 16) | (g << 8) | b;
}
return rgbData;
}
public static int[] ZoomImage(Image srcImg,int desW,int desH){
int srcW = srcImg.getWidth(); //原始图像宽
int srcH = srcImg.getHeight(); //原始图像高
int[] srcBuf = new int[srcW * srcH]; //原始图片像素信息缓存
if (srcImg.isMutable()) { /*如果是可变图像*/
} else { /*如果是非可变图像*/
srcImg.getRGB(srcBuf, 0, srcW,0,0,srcW,srcH);
}
int[] desBuf = new int[desW * desH]; //缩放后图片像素信息缓存
// Image desImg = Image.createImage(desW, desH);
//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] = (short) 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++;
}
}
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;
}
return desBuf;
}
}