I need to display a PNG image in a SWT Java window, I'm using WindowBuilder and Eclipse.
First I tried with a label and this code:
Label lblNewLabel = new Label(this, SWT.NONE);
lblNewLabel.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, true, true, 1, 1));
Image image = new Image(display, "img/selae_mini.png");
lblNewLabel.setImage(image)
It worked when executing in eclipse, but when I generate the jar, then, it doesn't work. Then I found on Stack Overflow that you must use ClassLoader.getSystemClassLoader().getResourceAsStream
to get a bufferedImage
and after that you must convert that bufferedImage
to a ImageData
, and finally convert that into a SWT Image
.
So I tried with this code:
protected Image readImage(String path, Display display) {
InputStream stream = ClassLoader.getSystemClassLoader().getResourceAsStream(path);
BufferedImage bi = null;
try {
bi = ImageIO.read(stream);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (stream != null)
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return new Image(display, convertToSWT(bi));
}
public static ImageData convertToSWT(BufferedImage bufferedImage) {
if (bufferedImage.getColorModel() instanceof DirectColorModel) {
DirectColorModel colorModel = (DirectColorModel) bufferedImage.getColorModel();
PaletteData palette = new PaletteData(
colorModel.getRedMask(),
colorModel.getGreenMask(),
colorModel.getBlueMask()
);
ImageData data = new ImageData(
bufferedImage.getWidth(),
bufferedImage.getHeight(), colorModel.getPixelSize(),
palette
);
WritableRaster raster = bufferedImage.getRaster();
int[] pixelArray = new int[3];
for (int y = 0; y < data.height; y++) {
for (int x = 0; x < data.width; x++) {
raster.getPixel(x, y, pixelArray);
int pixel = palette.getPixel(
new RGB(pixelArray[0], pixelArray[1], pixelArray[2])
);
data.setPixel(x, y, pixel);
}
}
return data;
} else if (bufferedImage.getColorModel() instanceof IndexColorModel) {
IndexColorModel colorModel = (IndexColorModel) bufferedImage.getColorModel();
int size = colorModel.getMapSize();
byte[] reds = new byte[size];
byte[] greens = new byte[size];
byte[] blues = new byte[size];
colorModel.getReds(reds);
colorModel.getGreens(greens);
colorModel.getBlues(blues);
RGB[] rgbs = new RGB[size];
for (int i = 0; i < rgbs.length; i++) {
rgbs[i] = new RGB(reds[i] & 0xFF, greens[i] & 0xFF, blues[i] & 0xFF);
}
PaletteData palette = new PaletteData(rgbs);
ImageData data = new ImageData(
bufferedImage.getWidth(),
bufferedImage.getHeight(),
colorModel.getPixelSize(),
palette
);
data.transparentPixel = colorModel.getTransparentPixel();
WritableRaster raster = bufferedImage.getRaster();
int[] pixelArray = new int[1];
for (int y = 0; y < data.height; y++) {
for (int x = 0; x < data.width; x++) {
raster.getPixel(x, y, pixelArray);
data.setPixel(x, y, pixelArray[0]);
}
}
return data;
}
return null;
}
The problem now is that my Image is a PNG file, and when doing the IF of the convertToSWT method, it gets that the image has a ColorModel called #pixelBits, so it returns null on that method! and I can't find any info about how to solve this problem.
I had this problem in before, and I resolved that. assuming your image has located in the resource folder of your project:
String yourImg = "sampleImg.png";
...
Label swtImg = new Label(composite, SWT.NONE);
swtImg.setImage(new Image(display, YourClassName.class.getResourceAsStream(yourImg)));
it's worked for me! good luck ;)