Java swt 图像插值

Question

我使用的java程序不是我自己编写的，但我有所有的源代码。该程序由控制相机和显示图像的 SWT 小部件组成(它要复杂得多，但这是相关部分)。到目前为止，一切都运行良好，但是从几个月前开始，当我们升级到 maven(可能还有我不知道的其他一些升级)时，它开始在放大时插入图像像素。这非常烦人，因为整个应用程序是取决于看到的各个像素。升级之前，当增加像素大小超过原始屏幕分辨率时，它会显示大的单色方 block ，这正是我想要的。现在它只是模糊了一切。

所以我的问题是:如何关闭图像插值？

干杯，安德烈亚斯

编辑以澄清:有一个滚动条控制执行以下代码的显示图像的大小。

void zoomScaleEvent(Event event, boolean centreOnMouse){
    setScale(selToScale(infoPanel.swtZoomScale.getSelection())); //force scale in range
    int newScaleSel = infoPanel.swtZoomScale.getSelection();

    Point dOrigin = swtImgScrollComp.getOrigin(); //display units
    Rectangle clientArea = swtImgScrollComp.getClientArea();

    // position in display coords of point to zoom in on 
    int dispZX, dispZY;
    if(centreOnMouse){
        dispZX = event.x; 
        dispZY = event.y;
    }else{
        dispZX = clientArea.width / 2;
        dispZY = clientArea.height / 2;
    }

    //position in image of that point (caled using the old scale) 
    double lastScale = selToScale(lastScaleSel);
    double imgZX = (dispZX + dOrigin.x) / lastScale;
    double imgZY = (dispZY + dOrigin.y) / lastScale;

    //origin of swtScrollComp of that point required to holding that point in the /same place/. 
    double newScale = selToScale(newScaleSel);
    double newDispOX =  imgZX * newScale - dispZX;
    double newDispOY =  imgZY * newScale - dispZY;

    swtImgScrollComp.setOrigin((int)newDispOX, (int)newDispOY);


    Img img = getSelectedImageFromConnectedSource();
    if(img != null){
        double scale[] = getScale();
        swtImageCanvas.setSize(
                (int)(img.getWidth()*scale[0]), 
                (int)(img.getHeight()*scale[1]));
    }
    lastScaleSel = newScaleSel;
    swtImageCanvas.redraw();

}

编辑2:我认为这是实际的绘图例程:

private void canvasPaintEvent(PaintEvent event){
    Rectangle clientArea = swtImageCanvas.getClientArea();
    Img image = getSelectedImageFromConnectedSource();

    if(image != null && swtCurImage != null){
        double scale[] = getScale();
        int imgX0 = (int)((double)event.x / scale[0]);
        int imgY0 = (int)((double)event.y / scale[1]);
        int imgW = (int)((double)event.width / scale[0]) + 2;
        int imgH = (int)((double)event.height / scale[1]) + 2;
        if((imgX0 + imgW) >= image.getWidth()){
            imgW = image.getWidth() - imgX0;
        }
        if((imgY0 + imgH) >= image.getHeight()){
            imgH = image.getHeight() - imgY0;
        }
        try{
            event.gc.drawImage(swtCurImage, imgX0, imgY0, imgW, imgH, 
                    (int)(imgX0*scale[0]), 
                    (int)(imgY0*scale[1]), 
                    (int)(imgW*scale[0]), 
                    (int)(imgH*scale[1]));
        }catch(IllegalArgumentException e){
            System.out.println("DRAW FAILED: " + scale + "\t" + imgX0 +", "+ imgY0+", "+ imgW+", "+ imgH +"\t-->\t" +
                    event.x+", "+ event.y+", "+ event.width+", "+ event.height);
        }        
        event.gc.setForeground(swtImageCanvas.getDisplay().getSystemColor(SWT.COLOR_BLACK));
        if(selectStartTime >= 0){
            event.gc.drawRectangle(
                    (int)(selX0 * scale[0]), (int)(selY0 * scale[1]),
                    (int)(selW * scale[0]), (int)(selH * scale[1]));
        }else{
            event.gc.drawLine(0, (int)(posY * scale[1]), clientArea.width, (int)(posY * scale[1]));
            event.gc.drawLine((int)(posX * scale[0]), 0, (int)(posX * scale[0]), clientArea.height);
        }

        for(ImagePipeController sinkController : sinkControllers.values())
            if(sinkController instanceof SWTControllerInfoDraw)
                ((SWTControllerInfoDraw)sinkController).drawOnImage(event.gc, scale, image.getWidth(), image.getHeight(), false);

        if(sourceControl != null && sourceControl instanceof SWTControllerInfoDraw){
            ((SWTControllerInfoDraw)sourceControl).drawOnImage(event.gc, scale, image.getWidth(), image.getHeight(), true);
        }

    }else{
        event.gc.fillRectangle(clientArea);
        if(image == null){
            event.gc.drawText("null image", 0, 0);
        }else if(image.isDestroyed()){
            event.gc.drawText("Image Destroyed", 0, 0);
        }else{
            event.gc.drawText("Image OK but no swtCurImage!?!", 0, 0);  
        }

    }

}

Answer 1

通话

event.gc.setInterpolation(SWT.NONE);

在event.gc.drawImage之前关闭图像插值。