qt实现九宫格布局，图片拉伸

　　在实现qt播放时，调用的mplayer,由于采用的是自定义绘图，用的是setAttribute(Qt::WA_TranslucentBackground);结果不能正常在上面显示播放画面，在默认皮肤下是没有问题的，决定用九宫格图片拉伸方式(效果如图)

 

附件图片：

文件:	tst2.rar
大小:	10KB
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typedef struct RECTANGLE
{
 int left;
 int top;
 int right;
 int bottom;
 RECTANGLE()
 {
  left = 0;
  top = 0;
  right = 0;
  bottom = 0;
 }

 RECTANGLE(int _left, int _top, int _right, int _bottom)
 {
  left = _left;
  top = _top;
  right = _right;
  bottom = _bottom;
 }
} RectangleEx;

Form::Form()
{
 RectangleEx margin(40, 30, 20, 20);
 resize(350, 500);
 QPalette p = palette();
   
 QPixmap img("back.png");
 QBitmap mask("backMask.png");
 QPixmap imgAA = scaleEx(img, margin);;
 QPixmap maskAA = scaleEx(mask, margin);;
 QRect r = imgAA.rect();
 QRect r2 = maskAA.rect();
 
    p.setBrush(QPalette::Window, QBrush(imgAA));
    setPalette(p);
    setMask(maskAA);
    setWindowFlags(Qt::FramelessWindowHint);
    
}

QPixmap Form::scaleEx(QPixmap &map,RectangleEx rect)
{
 QPixmap rMap;
 QRect fRect = frameGeometry();
 QRect pRect = map.rect();
 // for four corner rects of src
 // 1. topLeft rect
 QRect srcRect1 = QRect(0, 0, rect.left, rect.top);
 // 2. topRight rect
 QRect srcRect2 = QRect(pRect.width()-rect.right, 0, rect.right, rect.top);
 // 3. bottomLeft rect
 QRect srcRect3 = QRect(0, pRect.height()-rect.bottom, rect.left, rect.bottom);
 // 4. bottomRight rect
 QRect srcRect4 = QRect(pRect.width()-rect.right, pRect.height()-rect.bottom,
  rect.right, rect.bottom);

 QRect pSrcRectMid =  QRect(rect.left, rect.top,
  pRect.width()-(rect.left+rect.right), pRect.height()-(rect.top+rect.bottom));
 QRect pSrcRectMidTop = QRect(rect.left, 0, pRect.width()-(rect.left+rect.right), rect.top);
 QRect pSrcRectMidBottom = QRect(rect.left,pRect.height()-rect.bottom,
  pRect.width()-(rect.left+rect.right), rect.bottom);
 QRect pSrcRectMidLeft = QRect(0, rect.top, rect.left,
  pRect.height()-(rect.bottom+rect.top));
 QRect pSrcRectMidRight = QRect(pRect.width()-rect.right,rect.top,
  rect.right, pRect.height()-(rect.top+rect.bottom));

 // for four corner rects of desc
 // 1. topLeft rect
 QRect descRect1 = QRect(0, 0, rect.left, rect.top);
 // 2. topRight rect
 QRect descRect2 = QRect(fRect.width()-rect.right, 0, rect.right, rect.top);
 // 3. bottomLeft rect
 QRect descRect3 = QRect(0, fRect.height()-rect.bottom, rect.left, rect.bottom);
 // 4. bottomRight rect
 QRect descRect4 = QRect(fRect.width()-rect.right, fRect.height()-rect.bottom,
  rect.right, rect.bottom);

 QRect pDescRectMid =  QRect(rect.left, rect.top,
  fRect.width()-(rect.left+rect.right), fRect.height()-(rect.top+rect.bottom));
 QRect fDescRectMidTop = QRect(rect.left, 0,
   fRect.width()-(rect.left+rect.right), rect.top);
 QRect fDescRectMidLeft = QRect(0, rect.top, rect.left,
   fRect.height()-(rect.top + rect.bottom));
 QRect pDescRectMidRight = QRect(fRect.width()-rect.right, rect.top,
  rect.right, fRect.height()-(rect.top + rect.bottom));
 QRect fDescRectMidBottom = QRect(rect.left, fRect.height()-rect.bottom,
  fRect.width()-(rect.left+rect.right), rect.bottom);

 QPixmap map1 = map.copy(srcRect1);
 QPixmap map2 = map.copy(srcRect2);
 QPixmap map3 = map.copy(srcRect3);
 QPixmap map4 = map.copy(srcRect4);
 QPixmap mapMid = map.copy(pSrcRectMid);
 QPixmap mapMidLeft = map.copy(pSrcRectMidLeft);
 QPixmap mapMidRight = map.copy(pSrcRectMidRight);
 QPixmap mapMidTop = map.copy(pSrcRectMidTop);
 QPixmap mapMidBottom = map.copy(pSrcRectMidBottom);

 

 // new pixmap size
 QPixmap mapMidNew(fRect.width(), fRect.height());
 QPainter painter(&mapMidNew);
 // for four corners
 painter.drawPixmap(descRect1, map1, map1.rect());
 painter.drawPixmap(descRect2, map2, map2.rect());
 painter.drawPixmap(descRect3, map3, map3.rect());
 painter.drawPixmap(descRect4, map4, map4.rect());
 

 // mid and for four borders
 painter.drawPixmap(pDescRectMid, mapMid, mapMid.rect());
 painter.drawPixmap(fDescRectMidLeft, mapMidLeft, mapMidLeft.rect());
 painter.drawPixmap(pDescRectMidRight, mapMidRight, mapMidRight.rect());
 painter.drawPixmap(fDescRectMidTop, mapMidTop, mapMidTop.rect());
 painter.drawPixmap(fDescRectMidBottom, mapMidBottom, mapMidBottom.rect());

 //mapMidNew.save("kk02.png");
 return mapMidNew;
}

Form::~Form()
{
}

补允一下，这是一个测试，若稍改进一点，应该有个类似结构：
typedef struct PIXMAPINFO
{
 QRect rectTopLeft;
 QRect rectTopRight;
 QRect rectBottomLeft;
 QRect rectBottomRight;
 QRect rectMiddle;
 QRect rectMidLeft;
 QRect rectMidTop;
 QRect rectMidRight;
 QRect rectMidBottom;

 QPixmap pixTopLeft;
 QPixmap pixTopRight;
 QPixmap pixBottomLeft;
 QPixmap pixBottomRight;
 QPixmap pixMid;
 QPixmap pixMidLeft;
 QPixmap pixMidTop;
 QPixmap pixMidRight;
 QPixmap pixMidBottom;
} PixmapInfo;

这样理解比较清晰一点
PixmapInfo src;
PixmapInfo desc;

问题：
1. 当切换不同皮肤时，应该把src信息与desc信息分开，否则在resizeEvent中调用会造成拉伸窗口(改变大小)时显得不流畅
2. 当图拉大时，会出现占用内存增大

 img;
img.load("test.jpg");
   for (int i = 0; i < img.height(); i++)
       {
        for (int j = 0; j < img.width(); j++)
                {
            if(img.pixel(j, i) == qRgba(255,255,255,255))
                img.setPixel(j, i, Qt::transparent);//Or you can use qRgba(0,0,0,0) instead for trans
        }
    }
    img.save("changed.png");//I dont remember that png can alpha channel or not.