java.awt.image.BufferedImage#getRGB()源码实例Demo

private static void verify(BufferedImage dst) {
    int top_rgb = dst.getRGB(50, 25);
    System.out.printf("top_rgb: %x\n", top_rgb);
    int bot_rgb = dst.getRGB(50, 75);
    System.out.printf("bot_rgb: %x\n", bot_rgb);

    // expect to see blue color on the top of image
    if (top_rgb != 0xff0000ff) {
        throw new RuntimeException("Invaid top color: " +
                    Integer.toHexString(bot_rgb));
    }
    if (bot_rgb != 0xffff0000) {
        throw new RuntimeException("Invalid bottom color: " +
                Integer.toHexString(bot_rgb));
    }
}
 

/**
 * 将训练元字符装在一起
 * 
 * @param trainImg
 * @param smallImg
 * @param ch
 * @return
 */
private boolean addTrainImg(BufferedImage trainImg, BufferedImage smallImg, char ch) {
    int which = Arrays.binarySearch(TRAIN_CHARS, ch);
    int x = -1;
    int y = -1;
    for (int i = 0; i < TRAIN_NUM; ++i) {
        if (trainImg.getRGB(i * UNIT_W, which * (UNIT_H + 1) + UNIT_H) != TARGET_COLOR) {
            x = i * UNIT_W;
            y = which * (UNIT_H + 1);
            break;
        }
    }
    
    if (x == -1 || y == -1) {
        return false;
    }
    
    for (int i = 0; i < UNIT_W; ++i) {
        for (int j = 0; j < UNIT_H; ++j) {
            trainImg.setRGB(x + i, y + j, smallImg.getRGB(i, j));
        }
    }
    trainImg.setRGB(x, y + UNIT_H, TARGET_COLOR);
    return true;
}
 

public static void main(final String[] args) {

        final BufferedImage bi = createBufferedImage();
        final VolatileImage vi = createVolatileImage();
        final Graphics s2dVi = vi.getGraphics();

        //sw->texture->surface blit
        s2dVi.drawImage(bi, 0, 0, null);

        final BufferedImage results = vi.getSnapshot();
        for (int i = 0; i < SIZE; ++i) {
            for (int j = 0; j < SIZE; ++j) {
                //Image should be opaque: (black color and alpha = 255)
                if (results.getRGB(i, j) != 0xFF000000) {
                    throw new RuntimeException("Failed: Wrong alpha");
                }
            }
        }
        System.out.println("Passed");
    }
 

private void writePixels32(final BufferedImage src, final int bytesPerLine,
        final BinaryOutputStream bos) throws IOException, ImageWriteException {

    final int[] rgbs = new int[src.getWidth()];
    final byte[] plane = new byte[4 * bytesPerLine];
    for (int y = 0; y < src.getHeight(); y++) {
        src.getRGB(0, y, src.getWidth(), 1, rgbs, 0, src.getWidth());
        for (int x = 0; x < rgbs.length; x++) {
            plane[4 * x + 0] = (byte) rgbs[x];
            plane[4 * x + 1] = (byte) (rgbs[x] >> 8);
            plane[4 * x + 2] = (byte) (rgbs[x] >> 16);
            plane[4 * x + 3] = 0;
        }
        rleWriter.write(bos, plane);
    }
    rleWriter.flush(bos);
}
 

private static void checkResults(Image image) {
    BufferedImage buf = new BufferedImage(w, h,
                                          BufferedImage.TYPE_INT_RGB);
    Graphics2D g = buf.createGraphics();
    g.setColor(Color.pink);
    g.fillRect(0, 0, w, h);

    g.drawImage(image, 0, 0, null);

    g.dispose();

    int rgb = buf.getRGB(w/2, h/2);

    System.out.printf("Result color: %x\n", rgb);

    /* Buffered image should be the same as the last frame
     * of animated sequence (which is filled with blue).
     * Any other color indicates the problem.
     */
    if (rgb != 0xff0000ff) {
        throw new RuntimeException("Test FAILED!");
    }

    System.out.println("Test PASSED.");
}
 

public String convert( final BufferedImage image )
{
    StringBuilder sb = new StringBuilder( ( image.getWidth() + 1 ) * image.getHeight() );
    for ( int y = 0; y < image.getHeight(); y++ )
    {
        if ( sb.length() != 0 )
            sb.append( "\n" );
        for ( int x = 0; x < image.getWidth(); x++ )
        {
            Color pixelColor = new Color( image.getRGB( x, y ) );
            double gValue = (double) pixelColor.getRed() * 0.2989 + (double) pixelColor.getBlue() * 0.5870
                + (double) pixelColor.getGreen() * 0.1140;
            final char s = negative ? returnStrNeg( gValue ) : returnStrPos( gValue );
            sb.append( s );
        }
    }
    return sb.toString();
}
 

public static double distance(BufferedImage imgA, BufferedImage imgB) {
    // The images must be the same size.
    if (imgA.getWidth() == imgB.getWidth() && imgA.getHeight() == imgB.getHeight()) {
        int width = imgA.getWidth();
        int height = imgA.getHeight();

        double mse = 0;
        // Loop over every pixel.
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                Color ca = new Color(imgA.getRGB(x, y));
                Color cb = new Color(imgB.getRGB(x, y));
                double variance = sqr(ca.getRed() - cb.getRed()) //
                                  + sqr(ca.getBlue() - cb.getBlue()) //
                                  + sqr(ca.getGreen() - cb.getGreen()) //
                                  + sqr(ca.getAlpha() - cb.getAlpha());
                mse += variance;
            }
        }
        return Math.sqrt(mse / height / width);
    } else {
        return -1;
    }
}
 

public static void main(final String[] args) {

        final BufferedImage bi = createBufferedImage();
        final VolatileImage vi = createVolatileImage();
        final Graphics s2dVi = vi.getGraphics();

        //sw->texture->surface blit
        s2dVi.drawImage(bi, 0, 0, null);

        final BufferedImage results = vi.getSnapshot();
        for (int i = 0; i < SIZE; ++i) {
            for (int j = 0; j < SIZE; ++j) {
                //Image should be opaque: (black color and alpha = 255)
                if (results.getRGB(i, j) != 0xFF000000) {
                    throw new RuntimeException("Failed: Wrong alpha");
                }
            }
        }
        System.out.println("Passed");
    }
 

private static void testResult(final String desc,
                               final BufferedImage snapshot,
                               final int evilColor) {
    for (int y = 0; y < snapshot.getHeight(); y++) {
        for (int x = 0; x < snapshot.getWidth(); x++) {
            int snapRGB = snapshot.getRGB(x, y);
            if (!isSameColor(snapRGB, evilColor)) {
                System.err.printf("Wrong RGB for %s at (%d,%d): 0x%x " +
                    "instead of 0x%x\n", desc, x, y, snapRGB, evilColor);
                String fileName = "MutableColorTest_"+desc+".png";
                try {
                    ImageIO.write(snapshot, "png", new File(fileName));
                    System.err.println("Dumped snapshot to "+fileName);
                } catch (IOException ex) {}
                throw new RuntimeException("Test FAILED.");
            }
        }
    }
}
 

public static void main(String[] args) {

        /* Create an image to draw, filled in solid red. */
        BufferedImage srcImg =
             new BufferedImage(200, 200, BufferedImage.TYPE_INT_RGB);
        Graphics srcG = srcImg.createGraphics();
        srcG.setColor(Color.red);
        int w = srcImg.getWidth(null);
        int h = srcImg.getHeight(null);
        srcG.fillRect(0, 0, w, h);

        /* Create a destination image */
        BufferedImage dstImage =
           new BufferedImage(200, 200, BufferedImage.TYPE_INT_RGB);
        Graphics2D dstG = dstImage.createGraphics();
        /* draw image under a scaling transform that overflows int */
        AffineTransform tx = new AffineTransform(0.5, 0, 0, 0.5,
                                                  0, 5.8658460197478485E9);
        dstG.setTransform(tx);
        dstG.drawImage(srcImg, 0, 0, null );
        /* draw image under the same overflowing transform, cancelling
         * out the 0.5 scale on the graphics
         */
        dstG.drawImage(srcImg, 0, 0, 2*w, 2*h, null);
        if (Color.red.getRGB() == dstImage.getRGB(w/2, h/2)) {
             throw new RuntimeException("Unexpected color: clipping failed.");
        }
        System.out.println("Test Thread Completed");
    }
 

public static BufferedImage blendImagesFinB(BufferedImage foreImage, BufferedImage backImage,
        int x, int y, ImagesBlendMode blendMode, float alpha) {
    try {
        if (foreImage == null || backImage == null || blendMode == null) {
            return null;
        }
        int imageType = BufferedImage.TYPE_INT_ARGB;
        BufferedImage target = new BufferedImage(backImage.getWidth(), backImage.getHeight(), imageType);
        for (int j = 0; j < backImage.getHeight(); ++j) {
            for (int i = 0; i < backImage.getWidth(); ++i) {
                target.setRGB(i, j, backImage.getRGB(i, j));
            }
        }
        int areaWidth = Math.min(backImage.getWidth() - x, foreImage.getWidth());
        int areaHeight = Math.min(backImage.getHeight() - y, foreImage.getHeight());
        PixelBlend colorBlend = PixelBlend.newColorBlend(blendMode, alpha);
        for (int j = 0; j < areaHeight; ++j) {
            for (int i = 0; i < areaWidth; ++i) {
                int pixelFore = foreImage.getRGB(i, j);
                int pixelBack = backImage.getRGB(i + x, j + y);
                target.setRGB(i + x, j + y, colorBlend.blend(pixelFore, pixelBack));
            }
        }
        return target;
    } catch (Exception e) {
        logger.error(e.toString());
        return null;
    }
}
 

public static void main(String[] args) {

        GraphicsEnvironment ge =
            GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice gd = ge.getDefaultScreenDevice();
        GraphicsConfiguration gc = gd.getDefaultConfiguration();
        VolatileImage vi = gc.createCompatibleVolatileImage(16, 16);
        vi.validate(gc);

        BufferedImage bi =
            new BufferedImage(2, 2, BufferedImage.TYPE_INT_RGB);
        int data[] = ((DataBufferInt)bi.getRaster().getDataBuffer()).getData();
        data[0] = 0x0000007f;
        data[1] = 0x0000007f;
        data[2] = 0xff00007f;
        data[3] = 0xff00007f;
        Graphics2D g = vi.createGraphics();
        g.setComposite(AlphaComposite.SrcOver.derive(0.999f));
        g.drawImage(bi, 0, 0, null);

        bi = vi.getSnapshot();
        if (bi.getRGB(0, 0) != bi.getRGB(1, 1)) {
            throw new RuntimeException("Test FAILED: color at 0x0 ="+
                Integer.toHexString(bi.getRGB(0, 0))+" differs from 1x1 ="+
                Integer.toHexString(bi.getRGB(1,1)));
        }

        System.out.println("Test PASSED.");
    }
 

private static byte[] parseBufferedImage(BufferedImage image) {
    FastByteArrayOutputStream outputStream = new FastByteArrayOutputStream();
    for (int y = 0; y < image.getHeight(); y++) {
        for (int x = 0; x < image.getWidth(); x++) {
            Color color = new Color(image.getRGB(x, y), true);
            outputStream.write(color.getRed());
            outputStream.write(color.getGreen());
            outputStream.write(color.getBlue());
            outputStream.write(color.getAlpha());
        }
    }
    image.flush();
    return outputStream.toByteArray();
}
 

public static void main(String[] args) throws Exception {
  BufferedImage image = new BufferedImage(200, 200, BufferedImage.TYPE_INT_RGB);
  Graphics2D g = image.createGraphics();
  g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
  g.setPaint(Color.WHITE);
  g.fill(new Rectangle(image.getWidth(), image.getHeight()));
  g.translate(25, 100);

  Stroke stroke = new BasicStroke(200, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
  Shape shape = new Polygon(new int[] {0, 1500, 0}, new int[] {750, 0, -750}, 3);

  g.scale(.1, .1);
  g.setPaint(Color.BLACK);
  g.setStroke(stroke);
  g.draw(shape);
  g.setPaint(Color.RED);
  g.fill(stroke.createStrokedShape(shape));

  // To visually check it
  //ImageIO.write(image, "PNG", new File(args[0]));

  boolean blackPixelFound = false;
  outer:
  for (int x = 0; x < 200; ++x) {
    for (int y = 0; y < 200; ++y) {
      if (image.getRGB(x, y) == Color.BLACK.getRGB()) {
        blackPixelFound = true;
        break outer;
      }
    }
  }
  if (blackPixelFound) {
    throw new RuntimeException("The shape hasn't been filled in red.");
  }
}
 

private static boolean imagesAreEqual(BufferedImage i1, BufferedImage i2) {
    if (i1.getWidth() != i2.getWidth() || i1.getHeight() != i2.getHeight()) return false;
    for (int i = 0; i < i1.getWidth(); i++) {
        for (int j = 0; j < i1.getHeight(); j++) {
            if (i1.getRGB(i, j) != i2.getRGB(i, j)) {
                return false;
            }
        }
    }
    return true;
}
 

public static void main(String[] args) {
    GraphicsEnvironment ge =
        GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice gd = ge.getDefaultScreenDevice();
    GraphicsConfiguration gc = gd.getDefaultConfiguration();
    VolatileImage vi = gc.createCompatibleVolatileImage(100, 100);
    vi.validate(gc);
    VolatileImage vi1 = gc.createCompatibleVolatileImage(100, 100);
    vi1.validate(gc);

    if (!(vi instanceof DestSurfaceProvider)) {
        System.out.println("Test considered PASSED: no HW acceleration");
        return;
    }

    DestSurfaceProvider p = (DestSurfaceProvider)vi;
    Surface s = p.getDestSurface();
    if (!(s instanceof AccelSurface)) {
        System.out.println("Test considered PASSED: no HW acceleration");
        return;
    }
    AccelSurface dst = (AccelSurface)s;

    Graphics g = vi.createGraphics();
    g.drawImage(vi1, 95, 95, null);
    g.setColor(Color.red);
    g.fillRect(0, 0, 100, 100);
    g.setColor(Color.black);
    g.fillRect(0, 0, 100, 100);
    // after this the validated context color is black

    RenderQueue rq = dst.getContext().getRenderQueue();
    rq.lock();
    try {
        dst.getContext().saveState();
        dst.getContext().restoreState();
    } finally {
        rq.unlock();
    }

    // this will cause ResetPaint (it will set color to extended EA=ff,
    // which is ffffffff==Color.white)
    g.drawImage(vi1, 95, 95, null);

    // now try filling with black again, but it will come up as white
    // because this fill rect won't validate the color properly
    g.setColor(Color.black);
    g.fillRect(0, 0, 100, 100);

    BufferedImage bi = vi.getSnapshot();
    if (bi.getRGB(50, 50) != Color.black.getRGB()) {
        throw new RuntimeException("Test FAILED: found color="+
            Integer.toHexString(bi.getRGB(50, 50))+" instead of "+
            Integer.toHexString(Color.black.getRGB()));
    }

    System.out.println("Test PASSED.");
}
 

@Nonnull
public static Image renderWithTransparency(final float opacity, @Nonnull final AbstractElement element, @Nonnull final MindMapPanelConfig config, @Nonnull final RenderQuality quality) {
  final AbstractElement cloned = element.makeCopy();
  final Rectangle2D bounds = cloned.getBounds();

  final float increase = config.safeScaleFloatValue(config.getElementBorderWidth() + config.getShadowOffset(), 0.0f);
  final int imageWidth = (int) Math.round(bounds.getWidth() + increase);
  final int imageHeight = (int) Math.round(bounds.getHeight() + increase);

  bounds.setRect(0.0d, 0.0d, bounds.getWidth(), bounds.getHeight());

  final BufferedImage result = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_ARGB);

  for (int y = 0; y < imageHeight; y++) {
    for (int x = 0; x < imageWidth; x++) {
      result.setRGB(x, y, 0);
    }
  }

  final Graphics2D g = result.createGraphics();
  final MMGraphics gfx = new MMGraphics2DWrapper(g);
  try {
    quality.prepare(g);
    cloned.doPaint(gfx, config, false);
  } finally {
    gfx.dispose();
  }

  int alpha;
  if (opacity <= 0.0f) {
    alpha = 0x00;
  } else if (opacity >= 1.0f) {
    alpha = 0xFF;
  } else {
    alpha = Math.round(0xFF * opacity);
  }

  alpha <<= 24;

  for (int y = 0; y < imageHeight; y++) {
    for (int x = 0; x < imageWidth; x++) {
      final int curAlpha = result.getRGB(x, y) >>> 24;
      if (curAlpha == 0xFF) {
        result.setRGB(x, y, (result.getRGB(x, y) & 0xFFFFFF) | alpha);
      } else if (curAlpha != 0x00) {
        final int calculated = Math.round(curAlpha * opacity) << 24;
        result.setRGB(x, y, (result.getRGB(x, y) & 0xFFFFFF) | calculated);
      }
    }
  }

  return result;
}
 

private void readAndCheckImage() throws Exception {

        ImageReader reader = getTIFFReader();

        ImageInputStream s = ImageIO.createImageInputStream(new File(FILENAME));
        reader.setInput(s);

        int ni = reader.getNumImages(true);
        check(ni == 1, "invalid number of images");

        // check image
        BufferedImage img = reader.read(0);
        check(img.getWidth() == SZ && img.getHeight() == SZ,
            "invalid image size");

        Color c = new Color(img.getRGB(SZ / 2, SZ / 2));
        check(C.equals(c), "invalid image color");

        IIOMetadata metadata = reader.readAll(0, null).getMetadata();
        TIFFDirectory dir = TIFFDirectory.createFromMetadata(metadata);

        reader.dispose();
        s.close();

        // ===== perform tag checks =====

        checkASCIIField(dir, "copyright", COPYRIGHT,
            BaselineTIFFTagSet.TAG_COPYRIGHT);

        checkASCIIField(dir, "description", DESCRIPTION,
            BaselineTIFFTagSet.TAG_IMAGE_DESCRIPTION);

        checkASCIIField(dir, "software", SOFTWARE,
            BaselineTIFFTagSet.TAG_SOFTWARE);

        TIFFField f = dir.getTIFFField(BaselineTIFFTagSet.TAG_IMAGE_WIDTH);
        check(f.getCount() == 1, "invalid width field count");
        int w = f.getAsInt(0);
        check(w == SZ, "invalid width");

        f = dir.getTIFFField(BaselineTIFFTagSet.TAG_IMAGE_LENGTH);
        check(f.getCount() == 1, "invalid height field count");
        int h = f.getAsInt(0);
        check(h == SZ, "invalid height");

        f = dir.getTIFFField(BaselineTIFFTagSet.TAG_BITS_PER_SAMPLE);
        // RGB: 3 x 8 bits for R, G and B components
        int bps[] = f.getAsInts();
        check((f.getCount() == 3) && (bps.length == 3), "invalid BPS count");
        for (int b: bps) { check(b == 8, "invalid bits per sample"); }

        // RGB: PhotometricInterpretation = 2
        f = dir.getTIFFField(BaselineTIFFTagSet.TAG_PHOTOMETRIC_INTERPRETATION);
        check(f.getCount() == 1, "invalid count");
        check(f.getAsInt(0) == BaselineTIFFTagSet.PHOTOMETRIC_INTERPRETATION_RGB,
            "invalid photometric interpretation value");

        String rat = " resolution must be rational";
        f = dir.getTIFFField(BaselineTIFFTagSet.TAG_X_RESOLUTION);
        check(f.getType() == TIFFTag.TIFF_RATIONAL, "x" + rat);
        check(f.getCount() == 1 &&
              f.getAsInt(0) == (int) (RES_X[0][0] / RES_X[0][1]),
              "invalid x resolution");

        f = dir.getTIFFField(BaselineTIFFTagSet.TAG_Y_RESOLUTION);
        check(f.getType() == TIFFTag.TIFF_RATIONAL, "y" + rat);
        check(f.getCount() == 1 &&
              f.getAsInt(0) == (int) (RES_Y[0][0] / RES_Y[0][1]),
              "invalid y resolution");

        f = dir.getTIFFField(BaselineTIFFTagSet.TAG_ICC_PROFILE);
        check(f.getType() == TIFFTag.TIFF_UNDEFINED,
            "invalid ICC profile field type");
        int cnt = f.getCount();
        byte icc[] = f.getAsBytes();
        check((cnt == ICC_PROFILE.length) && (cnt == icc.length),
                "invalid ICC profile");
        for (int i = 0; i < cnt; i++) {
            check(icc[i] == ICC_PROFILE[i], "invalid ICC profile");
        }
    }
 

@Override
public void fillDynamicImage(Object dynamicImage, BufferedImage image) {
	image.getRGB(0, 0, image.getWidth(), image.getHeight(), ((blz) dynamicImage).e(), 0, image.getWidth());
	((blz) dynamicImage).d();
}
 

private ComparisonResult compareScreenshots(ActualScreenshot screenshot) {
  int totalPixels = screenshot.getWidth() * screenshot.getHeight();
  Optional<BufferedImage> maybeGoldenImage = loadGoldenImageByName(screenshot.getImageName());
  ComparisonResult.Builder commonBuilder =
      ComparisonResult.builder()
          .setActualScreenshot(screenshot)
          .setIsConsideredSimilar(false)
          .setIsMissingGoldenImage(false)
          .setIsSizeDifferent(false)
          .setNumDiffPixels(totalPixels);

  if (!maybeGoldenImage.isPresent()) {
    return commonBuilder.setIsMissingGoldenImage(true).build();
  }
  BufferedImage goldenImage = maybeGoldenImage.get();

  if ((screenshot.getWidth() != goldenImage.getWidth())
      || (screenshot.getHeight() != goldenImage.getHeight())) {
    return commonBuilder.setIsSizeDifferent(true).build();
  }

  int currPixelDiff = 0;
  for (int x = 0; x < screenshot.getWidth(); x++) {
    for (int y = 0; y < screenshot.getHeight(); y++) {
      Color screenshotColor = new Color(screenshot.getRGB(x, y));
      Color goldenImageColor = new Color(goldenImage.getRGB(x, y));
      int currColorDiff =
          IntStream.of(
                  abs(screenshotColor.getRed() - goldenImageColor.getRed()),
                  abs(screenshotColor.getGreen() - goldenImageColor.getGreen()),
                  abs(screenshotColor.getBlue() - goldenImageColor.getBlue()))
              .max()
              .getAsInt();
      if (currColorDiff > maxColorDiff) {
        currPixelDiff++;
      }
    }
  }
  commonBuilder.setNumDiffPixels(currPixelDiff);
  if (currPixelDiff <= maxPixelDiff) {
    commonBuilder.setIsConsideredSimilar(true);
  }

  return commonBuilder.build();
}