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Diffstat (limited to 'libraries/launcher/org/multimc/IconLoader.java')
| -rw-r--r-- | libraries/launcher/org/multimc/IconLoader.java | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/libraries/launcher/org/multimc/IconLoader.java b/libraries/launcher/org/multimc/IconLoader.java new file mode 100644 index 00000000..f1638f3a --- /dev/null +++ b/libraries/launcher/org/multimc/IconLoader.java @@ -0,0 +1,132 @@ +package org.multimc; + +import javax.imageio.ImageIO; +import java.awt.*; +import java.awt.image.BufferedImage; +import java.io.File; +import java.io.IOException; +import java.nio.ByteBuffer; + +/***************************************************************************** + * A convenience class for loading icons from images. + * + * Icons loaded from this class are formatted to fit within the required + * dimension (16x16, 32x32, or 128x128). If the source image is larger than the + * target dimension, it is shrunk down to the minimum size that will fit. If it + * is smaller, then it is only scaled up if the new scale can be a per-pixel + * linear scale (i.e., x2, x3, x4, etc). In both cases, the image's width/height + * ratio is kept the same as the source image. + * + * @author Chris Molini + *****************************************************************************/ +public class IconLoader +{ + /************************************************************************* + * Loads an icon in ByteBuffer form. + * + * @param filepath + * The location of the Image to use as an icon. + * + * @return An array of ByteBuffers containing the pixel data for the icon in + * various sizes (as recommended by the OS). + *************************************************************************/ + public static ByteBuffer[] load(String filepath) + { + BufferedImage image; + try { + image = ImageIO.read ( new File( filepath ) ); + } catch ( IOException e ) { + e.printStackTrace(); + return new ByteBuffer[0]; + } + ByteBuffer[] buffers; + buffers = new ByteBuffer[1]; + buffers[0] = loadInstance(image, 128); + return buffers; + } + + /************************************************************************* + * Copies the supplied image into a square icon at the indicated size. + * + * @param image + * The image to place onto the icon. + * @param dimension + * The desired size of the icon. + * + * @return A ByteBuffer of pixel data at the indicated size. + *************************************************************************/ + private static ByteBuffer loadInstance(BufferedImage image, int dimension) + { + BufferedImage scaledIcon = new BufferedImage(dimension, dimension, + BufferedImage.TYPE_INT_ARGB_PRE); + Graphics2D g = scaledIcon.createGraphics(); + double ratio = getIconRatio(image, scaledIcon); + double width = image.getWidth() * ratio; + double height = image.getHeight() * ratio; + g.drawImage(image, (int) ((scaledIcon.getWidth() - width) / 2), + (int) ((scaledIcon.getHeight() - height) / 2), (int) (width), + (int) (height), null); + g.dispose(); + + return convertToByteBuffer(scaledIcon); + } + + /************************************************************************* + * Gets the width/height ratio of the icon. This is meant to simplify + * scaling the icon to a new dimension. + * + * @param src + * The base image that will be placed onto the icon. + * @param icon + * The icon that will have the image placed on it. + * + * @return The amount to scale the source image to fit it onto the icon + * appropriately. + *************************************************************************/ + private static double getIconRatio(BufferedImage src, BufferedImage icon) + { + double ratio = 1; + if (src.getWidth() > icon.getWidth()) + ratio = (double) (icon.getWidth()) / src.getWidth(); + else + ratio = (int) (icon.getWidth() / src.getWidth()); + if (src.getHeight() > icon.getHeight()) + { + double r2 = (double) (icon.getHeight()) / src.getHeight(); + if (r2 < ratio) + ratio = r2; + } + else + { + double r2 = (int) (icon.getHeight() / src.getHeight()); + if (r2 < ratio) + ratio = r2; + } + return ratio; + } + + /************************************************************************* + * Converts a BufferedImage into a ByteBuffer of pixel data. + * + * @param image + * The image to convert. + * + * @return A ByteBuffer that contains the pixel data of the supplied image. + *************************************************************************/ + public static ByteBuffer convertToByteBuffer(BufferedImage image) + { + byte[] buffer = new byte[image.getWidth() * image.getHeight() * 4]; + int counter = 0; + for (int i = 0; i < image.getHeight(); i++) + for (int j = 0; j < image.getWidth(); j++) + { + int colorSpace = image.getRGB(j, i); + buffer[counter + 0] = (byte) ((colorSpace << 8) >> 24); + buffer[counter + 1] = (byte) ((colorSpace << 16) >> 24); + buffer[counter + 2] = (byte) ((colorSpace << 24) >> 24); + buffer[counter + 3] = (byte) (colorSpace >> 24); + counter += 4; + } + return ByteBuffer.wrap(buffer); + } +}
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