/** 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
}
/**
* 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;
}
}
/**
* 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;
}
}
