com.github.mathiewz.slick.opengl.ImageIOImageData Maven / Gradle / Ivy
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The main purpose of this libraryis to modernize and maintain the slick2D library.
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package com.github.mathiewz.slick.opengl;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.color.ColorSpace;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.ComponentColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Hashtable;
import javax.imageio.ImageIO;
import com.github.mathiewz.slick.SlickException;
/**
* An image data provider that uses ImageIO to retrieve image data in a format
* suitable for creating OpenGL textures. This implementation is used when
* formats not natively supported by the library are required.
*
* @author kevin
*/
public class ImageIOImageData implements LoadableImageData {
/** The colour model including alpha for the GL image */
private static final ColorModel glAlphaColorModel = new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB), new int[] { 8, 8, 8, 8 }, true, false, ComponentColorModel.TRANSLUCENT, DataBuffer.TYPE_BYTE);
/** The colour model for the GL image */
private static final ColorModel glColorModel = new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB), new int[] { 8, 8, 8, 0 }, false, false, ComponentColorModel.OPAQUE, DataBuffer.TYPE_BYTE);
/** The bit depth of the image */
private int depth;
/** The height of the image */
private int height;
/** The width of the image */
private int width;
/** The width of the texture that should be created for the image */
private int texWidth;
/** The height of the texture that should be created for the image */
private int texHeight;
/** True if we should edge */
private boolean edging = true;
/**
* @see com.github.mathiewz.slick.opengl.ImageData#getDepth()
*/
@Override
public int getDepth() {
return depth;
}
/**
* @see com.github.mathiewz.slick.opengl.ImageData#getHeight()
*/
@Override
public int getHeight() {
return height;
}
/**
* @see com.github.mathiewz.slick.opengl.ImageData#getTexHeight()
*/
@Override
public int getTexHeight() {
return texHeight;
}
/**
* @see com.github.mathiewz.slick.opengl.ImageData#getTexWidth()
*/
@Override
public int getTexWidth() {
return texWidth;
}
/**
* @see com.github.mathiewz.slick.opengl.ImageData#getWidth()
*/
@Override
public int getWidth() {
return width;
}
/**
* @see com.github.mathiewz.slick.opengl.LoadableImageData#loadImage(java.io.InputStream)
*/
@Override
public ByteBuffer loadImage(InputStream fis) throws IOException {
return loadImage(fis, true, null);
}
/**
* @see com.github.mathiewz.slick.opengl.LoadableImageData#loadImage(java.io.InputStream, boolean, int[])
*/
@Override
public ByteBuffer loadImage(InputStream fis, boolean flipped, int[] transparent) throws IOException {
return loadImage(fis, flipped, false, transparent);
}
/**
* @see com.github.mathiewz.slick.opengl.LoadableImageData#loadImage(java.io.InputStream, boolean, boolean, int[])
*/
@Override
public ByteBuffer loadImage(InputStream fis, boolean flipped, boolean forceAlpha, int[] transparent) throws IOException {
if (transparent != null) {
forceAlpha = true;
}
BufferedImage bufferedImage = ImageIO.read(fis);
return imageToByteBuffer(bufferedImage, flipped, forceAlpha, transparent);
}
public ByteBuffer imageToByteBuffer(BufferedImage image, boolean flipped, boolean forceAlpha, int[] transparent) {
ByteBuffer imageBuffer = null;
WritableRaster raster;
BufferedImage texImage;
int texWidth = 2;
int texHeight = 2;
// find the closest power of 2 for the width and height
// of the produced texture
while (texWidth < image.getWidth()) {
texWidth *= 2;
}
while (texHeight < image.getHeight()) {
texHeight *= 2;
}
width = image.getWidth();
height = image.getHeight();
this.texHeight = texHeight;
this.texWidth = texWidth;
// create a raster that can be used by OpenGL as a source
// for a texture
boolean useAlpha = image.getColorModel().hasAlpha() || forceAlpha;
if (useAlpha) {
depth = 32;
raster = Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE, texWidth, texHeight, 4, null);
texImage = new BufferedImage(glAlphaColorModel, raster, false, new Hashtable<>());
} else {
depth = 24;
raster = Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE, texWidth, texHeight, 3, null);
texImage = new BufferedImage(glColorModel, raster, false, new Hashtable<>());
}
// copy the source image into the produced image
Graphics2D g = (Graphics2D) texImage.getGraphics();
// only need to blank the image for mac compatibility if we're using alpha
if (useAlpha) {
g.setColor(new Color(0f, 0f, 0f, 0f));
g.fillRect(0, 0, texWidth, texHeight);
}
if (flipped) {
g.scale(1, -1);
g.drawImage(image, 0, -height, null);
} else {
g.drawImage(image, 0, 0, null);
}
if (edging) {
if (height < texHeight - 1) {
copyArea(texImage, 0, 0, width, 1, 0, texHeight - 1);
copyArea(texImage, 0, height - 1, width, 1, 0, 1);
}
if (width < texWidth - 1) {
copyArea(texImage, 0, 0, 1, height, texWidth - 1, 0);
copyArea(texImage, width - 1, 0, 1, height, 1, 0);
}
}
// build a byte buffer from the temporary image
// that be used by OpenGL to produce a texture.
byte[] data = ((DataBufferByte) texImage.getRaster().getDataBuffer()).getData();
if (transparent != null) {
for (int i = 0; i < data.length; i += 4) {
boolean match = true;
for (int c = 0; c < 3; c++) {
int value = data[i + c] < 0 ? 256 + data[i + c] : data[i + c];
if (value != transparent[c]) {
match = false;
}
}
if (match) {
data[i + 3] = 0;
}
}
}
imageBuffer = ByteBuffer.allocateDirect(data.length);
imageBuffer.order(ByteOrder.nativeOrder());
imageBuffer.put(data, 0, data.length);
imageBuffer.flip();
g.dispose();
return imageBuffer;
}
/**
* @see com.github.mathiewz.slick.opengl.ImageData#getImageBufferData()
*/
@Override
public ByteBuffer getImageBufferData() {
throw new SlickException("ImageIOImageData doesn't store it's image.");
}
/**
* Implement of transform copy area for 1.4
*
* @param image
* The image to copy
* @param x
* The x position to copy to
* @param y
* The y position to copy to
* @param width
* The width of the image
* @param height
* The height of the image
* @param dx
* The transform on the x axis
* @param dy
* The transform on the y axis
*/
private void copyArea(BufferedImage image, int x, int y, int width, int height, int dx, int dy) {
Graphics2D g = (Graphics2D) image.getGraphics();
g.drawImage(image.getSubimage(x, y, width, height), x + dx, y + dy, null);
}
/**
* @see com.github.mathiewz.slick.opengl.LoadableImageData#configureEdging(boolean)
*/
@Override
public void configureEdging(boolean edging) {
this.edging = edging;
}
}