package org.newdawn.slick.opengl;
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import org.lwjgl.BufferUtils;
/**
* A utility to load TGAs. Note: NOT THREAD SAFE
*
* Fresh cut of code but largely influeneced by the TGA loading class
* provided as part of the Java Monkey Engine (JME). Why not check out
* what they're doing over at http://www.jmonkeyengine.com. kudos to
* Mark Powell.
*
* @author Kevin Glass
*/
public class TGAImageData implements LoadableImageData {
/** The width of the texture that needs to be generated */
private int texWidth;
/** The height of the texture that needs to be generated */
private int texHeight;
/** The width of the TGA image */
private int width;
/** The height of the TGA image */
private int height;
/** The bit depth of the image */
private short pixelDepth;
/**
* Create a new TGA Loader
*/
public TGAImageData() {
}
/**
* Flip the endian-ness of the short
*
* @param signedShort The short to flip
* @return The flipped short
*/
private short flipEndian(short signedShort) {
int input = signedShort & 0xFFFF;
return (short) (input << 8 | (input & 0xFF00) >>> 8);
}
/**
* @see org.newdawn.slick.opengl.ImageData#getDepth()
*/
public int getDepth() {
return pixelDepth;
}
/**
* @see org.newdawn.slick.opengl.ImageData#getWidth()
*/
public int getWidth() {
return width;
}
/**
* @see org.newdawn.slick.opengl.ImageData#getHeight()
*/
public int getHeight() {
return height;
}
/**
* @see org.newdawn.slick.opengl.ImageData#getTexWidth()
*/
public int getTexWidth() {
return texWidth;
}
/**
* @see org.newdawn.slick.opengl.ImageData#getTexHeight()
*/
public int getTexHeight() {
return texHeight;
}
/**
* @see org.newdawn.slick.opengl.LoadableImageData#loadImage(java.io.InputStream)
*/
public ByteBuffer loadImage(InputStream fis) throws IOException {
return loadImage(fis,true, null);
}
/**
* @see org.newdawn.slick.opengl.LoadableImageData#loadImage(java.io.InputStream, boolean, int[])
*/
public ByteBuffer loadImage(InputStream fis, boolean flipped, int[] transparent) throws IOException {
return loadImage(fis, flipped, false, transparent);
}
/**
* @see org.newdawn.slick.opengl.LoadableImageData#loadImage(java.io.InputStream, boolean, boolean, int[])
*/
public ByteBuffer loadImage(InputStream fis, boolean flipped, boolean forceAlpha, int[] transparent) throws IOException {
if (transparent != null) {
forceAlpha = true;
}
byte red = 0;
byte green = 0;
byte blue = 0;
byte alpha = 0;
BufferedInputStream bis = new BufferedInputStream(fis, 100000);
DataInputStream dis = new DataInputStream(bis);
// Read in the Header
short idLength = (short) dis.read();
short colorMapType = (short) dis.read();
short imageType = (short) dis.read();
short cMapStart = flipEndian(dis.readShort());
short cMapLength = flipEndian(dis.readShort());
short cMapDepth = (short) dis.read();
short xOffset = flipEndian(dis.readShort());
short yOffset = flipEndian(dis.readShort());
width = flipEndian(dis.readShort());
height = flipEndian(dis.readShort());
pixelDepth = (short) dis.read();
texWidth = get2Fold(width);
texHeight = get2Fold(height);
short imageDescriptor = (short) dis.read();
if ((imageDescriptor & 0x0020) == 0) {
flipped = !flipped;
}
// Skip image ID
if (idLength > 0) {
bis.skip(idLength);
}
byte[] rawData = null;
if ((pixelDepth == 32) || (forceAlpha)) {
pixelDepth = 32;
rawData = new byte[texWidth * texHeight * 4];
} else if (pixelDepth == 24) {
rawData = new byte[texWidth * texHeight * 3];
} else {
throw new RuntimeException("Only 24 and 32 bit TGAs are supported");
}
if (pixelDepth == 24) {
if (flipped) {
for (int i = height-1; i >= 0; i--) {
for (int j = 0; j < width; j++) {
blue = dis.readByte();
green = dis.readByte();
red = dis.readByte();
int ofs = ((j + (i * texWidth)) * 3);
rawData[ofs] = red;
rawData[ofs + 1] = green;
rawData[ofs + 2] = blue;
}
}
} else {
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
blue = dis.readByte();
green = dis.readByte();
red = dis.readByte();
int ofs = ((j + (i * texWidth)) * 3);
rawData[ofs] = red;
rawData[ofs + 1] = green;
rawData[ofs + 2] = blue;
}
}
}
} else if (pixelDepth == 32) {
if (flipped) {
for (int i = height-1; i >= 0; i--) {
for (int j = 0; j < width; j++) {
blue = dis.readByte();
green = dis.readByte();
red = dis.readByte();
if (forceAlpha) {
alpha = (byte) 255;
} else {
alpha = dis.readByte();
}
int ofs = ((j + (i * texWidth)) * 4);
rawData[ofs] = red;
rawData[ofs + 1] = green;
rawData[ofs + 2] = blue;
rawData[ofs + 3] = alpha;
if (alpha == 0) {
rawData[ofs + 2] = (byte) 0;
rawData[ofs + 1] = (byte) 0;
rawData[ofs] = (byte) 0;
}
}
}
} else {
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
blue = dis.readByte();
green = dis.readByte();
red = dis.readByte();
if (forceAlpha) {
alpha = (byte) 255;
} else {
alpha = dis.readByte();
}
int ofs = ((j + (i * texWidth)) * 4);
if (ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN) {
rawData[ofs] = red;
rawData[ofs + 1] = green;
rawData[ofs + 2] = blue;
rawData[ofs + 3] = alpha;
} else {
rawData[ofs] = red;
rawData[ofs + 1] = green;
rawData[ofs + 2] = blue;
rawData[ofs + 3] = alpha;
}
if (alpha == 0) {
rawData[ofs + 2] = 0;
rawData[ofs + 1] = 0;
rawData[ofs] = 0;
}
}
}
}
}
fis.close();
if (transparent != null) {
for (int i=0;i<rawData.length;i+=4) {
boolean match = true;
for (int c=0;c<3;c++) {
if (rawData[i+c] != transparent[c]) {
match = false;
}
}
if (match) {
rawData[i+3] = 0;
}
}
}
// Get a pointer to the image memory
ByteBuffer scratch = BufferUtils.createByteBuffer(rawData.length);
scratch.put(rawData);
scratch.flip();
return scratch;
}
/**
* Get the closest greater power of 2 to the fold number
*
* @param fold The target number
* @return The power of 2
*/
private int get2Fold(int fold) {
int ret = 2;
while (ret < fold) {
ret *= 2;
}
return ret;
}
/**
* @see org.newdawn.slick.opengl.ImageData#getImageBufferData()
*/
public ByteBuffer getImageBufferData() {
throw new RuntimeException("TGAImageData doesn't store it's image.");
}
}