/**
* Create GLImage from image file bytes (the contents of a jpg, gif or png file). Flip Y axis.
*
* @param pixels
* @param w
* @param h
*/
public GLImage(byte[] bytes) {
BufferedImage img = makeBufferedImage(bytes);
if (makeGLImage(img, true, false)) {
GLApp.msg("GLImage(byte[]): loaded image from bytes[" + bytes.length + "]");
} else {
GLApp.err("GLImage(byte[]): could not create Image from bytes[" + bytes.length + "]");
}
}
/**
* Create GLImage from image file bytes (the contents of a jpg, gif or png file).
*
* @param pixels
* @param w
* @param h
*/
public GLImage(byte[] bytes, boolean flipYaxis, boolean convertPow2) {
BufferedImage img = makeBufferedImage(bytes);
if (makeGLImage(img, flipYaxis, convertPow2)) {
GLApp.msg("GLImage(byte[],bool,bool): loaded image from bytes[" + bytes.length + "]");
} else {
GLApp.err(
"GLImage(byte[],bool,bool): could not create Image from bytes[" + bytes.length + "]");
}
}
/**
* Load a BufferedImage from the given image file name. File can be in the local filesytem, in the
* applet folder, or in a jar.
*/
public BufferedImage loadJavaImage(String imgName) {
BufferedImage tmpi = null;
try {
tmpi = ImageIO.read(GLApp.getInputStream(imgName));
} catch (Exception e) {
GLApp.err("GLImage.loadJavaImage() exception: FAILED TO LOAD IMAGE " + e);
}
return tmpi;
}
/**
* Scale the given BufferedImage to width and height that are powers of two. Return the new scaled
* BufferedImage.
*/
public static BufferedImage convertToPowerOf2(BufferedImage bsrc) {
// find powers of 2 equal to or greater than current dimensions
int newW = GLApp.getPowerOfTwoBiggerThan(bsrc.getWidth());
int newH = GLApp.getPowerOfTwoBiggerThan(bsrc.getHeight());
if (newW == bsrc.getWidth() && newH == bsrc.getHeight()) {
return bsrc; // no change necessary
} else {
AffineTransform at =
AffineTransform.getScaleInstance(
(double) newW / bsrc.getWidth(), (double) newH / bsrc.getHeight());
BufferedImage bdest = new BufferedImage(newW, newH, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = bdest.createGraphics();
g.drawRenderedImage(bsrc, at);
return bdest;
}
}
/** Scale this GLImage so width and height are powers of 2. Recreate pixels and pixelBuffer. */
public void convertToPowerOf2() {
// make BufferedImage from original pixels
BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
image.setRGB(0, 0, w, h, pixels, 0, w);
// scale into new image
BufferedImage scaledImg = convertToPowerOf2(image);
// resample pixel data
w = scaledImg.getWidth(null);
h = scaledImg.getHeight(null);
pixels = getImagePixels(scaledImg); // pixels in default Java ARGB format
pixelBuffer = convertImagePixelsRGBA(pixels, w, h, false); // convert to bytes in RGBA format
textureW = GLApp.getPowerOfTwoBiggerThan(w); // the texture size big enough to hold this image
textureH = GLApp.getPowerOfTwoBiggerThan(h); // the texture size big enough to hold this image
}
/**
* Make a BufferedImage from the contents of an image file.
*
* @param imageFileContents byte array containing the guts of a JPG, GIF, or PNG
*/
public BufferedImage makeBufferedImage(byte[] imageFileContents) {
BufferedImage bi = null;
try {
InputStream in = new ByteArrayInputStream(imageFileContents);
bi = javax.imageio.ImageIO.read(in);
} catch (IOException ioe) {
GLApp.err("GLImage.makeBufferedImage(): " + ioe);
}
return bi;
}
/**
* Copy ARGB pixels to a ByteBuffer without changing the ARGB byte order. If used to make a
* texture, the pixel format is GL12.GL_BGRA. With this format we can leave pixels in ARGB order
* (faster), but unfortunately I had problems building mipmaps in BGRA format
* (GLU.gluBuild2DMipmaps() did not recognize GL_UNSIGNED_INT_8_8_8_8 and
* GL_UNSIGNED_INT_8_8_8_8_REV types so screwed up the BGRA/ARGB byte order on Mac).
*
* @return ByteBuffer
*/
public static ByteBuffer convertImagePixelsARGB(
int[] jpixels, int imgw, int imgh, boolean flipVertically) {
// flip Y axis
if (flipVertically) {
jpixels = flipPixels(jpixels, imgw, imgh); // flip Y axis
}
// put int pixels into Byte Buffer
ByteBuffer bb = GLApp.allocBytes(jpixels.length * 4); // 4 bytes per pixel
bb.asIntBuffer().put(jpixels);
return bb;
}
/**
* Load an image from the given filename. If convertToPow2 is true then convert the image to a
* power of two. Store pixels as ARGB ints in the pixels array and as RGBA bytes in the
* pixelBuffer ByteBuffer. Hold onto image width/height.
*
* @param imgName
*/
public boolean makeGLImage(BufferedImage tmpi, boolean flipYaxis, boolean convertToPow2) {
if (tmpi != null) {
if (flipYaxis) {
tmpi = flipY(tmpi);
}
if (convertToPow2) {
tmpi = convertToPowerOf2(tmpi);
}
w = tmpi.getWidth(null);
h = tmpi.getHeight(null);
pixels = getImagePixels(tmpi); // pixels in default Java ARGB format
pixelBuffer = convertImagePixelsRGBA(pixels, w, h, false); // convert to bytes in RGBA format
textureW = GLApp.getPowerOfTwoBiggerThan(w); // the texture size big enough to hold this image
textureH = GLApp.getPowerOfTwoBiggerThan(h); // the texture size big enough to hold this image
// GLApp.msg("GLImage: loaded " + imgName + ", width=" + w + " height=" + h);
return true;
} else {
// GLApp.err("GLImage: FAILED TO LOAD IMAGE " + imgName);
pixels = null;
pixelBuffer = null;
h = w = 0;
return false;
}
}
/**
* Return the Image pixels in default Java int ARGB format.
*
* @return
*/
public static int[] getImagePixels(Image image) {
int[] pixelsARGB = null;
if (image != null) {
int imgw = image.getWidth(null);
int imgh = image.getHeight(null);
pixelsARGB = new int[imgw * imgh];
PixelGrabber pg = new PixelGrabber(image, 0, 0, imgw, imgh, pixelsARGB, 0, imgw);
try {
pg.grabPixels();
} catch (Exception e) {
GLApp.err("Pixel Grabbing interrupted!");
return null;
}
}
return pixelsARGB;
}
/**
* Save an array of ARGB pixels to a PNG file. If flipY is true, flip the pixels on the Y axis
* before saving.
*/
public static void savePixelsToPNG(
int[] pixels, int width, int height, String imageFilename, boolean flipY) {
if (pixels != null && imageFilename != null) {
if (flipY) {
// flip the pixels vertically (opengl has 0,0 at lower left, java is upper left)
pixels = GLImage.flipPixels(pixels, width, height);
}
try {
// Create a BufferedImage with the RGB pixels then save as PNG
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
image.setRGB(0, 0, width, height, pixels, 0, width);
javax.imageio.ImageIO.write(image, "png", new File(imageFilename));
} catch (Exception e) {
GLApp.err("GLImage.savePixelsToPNG(" + imageFilename + "): exception " + e);
}
}
}
/**
* Load pixels from an image file. Convert to RGBA format.
*
* @param imgName
*/
public GLImage(String imgName, boolean flipYaxis, boolean convertPow2) {
BufferedImage img = loadJavaImage(imgName);
if (makeGLImage(img, flipYaxis, convertPow2)) {
GLApp.msg("GLImage(String,bool,bool): loaded " + imgName + ", width=" + w + " height=" + h);
}
}
/**
* Load pixels from an image file. Flip Y axis. Convert to RGBA format.
*
* @param imgName
*/
public GLImage(String imgName) {
BufferedImage img = loadJavaImage(imgName);
if (makeGLImage(img, true, false)) {
GLApp.msg("GLImage(String): loaded " + imgName + ", width=" + w + " height=" + h);
}
}