import java.util.Arrays;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
/**
* Stores a set of pixels in a component-based format.
* The component-based format stores colors as follows:
*
* Byte 0: Alpha
* Byte 1: Blue
* Byte 2: Green
* Byte 3: Red
*
* This format is fast, compact, and ideal for software rendering.
* It has the following key advantages:
* - Entire images can be copied to the screen with a single call to
* System.arrayCopy. (If the screen is not in ABGR pixel format, it requires
* some conversion. However, the conversion is typically quick and simple).
* - Per component operations, such as lighting, can be performed cheaply without any
* pixel format converison.
*
* This class is primarily intended to be a high-performance image storing
* facility for software rendering. As such, there are points where ease of
* use is compromised for the sake of performance. If you need to store and
* use images outside of a software renderer, it is recommended that you use
* Java's standard image classes instead.
*/
public class Bitmap
{
/** The width, in pixels, of the image */
private final int m_width;
/** The height, in pixels, of the image */
private final int m_height;
/** Every pixel component in the image */
private final byte m_components[];
/** Basic getter */
public int GetWidth() { return m_width; }
/** Basic getter */
public int GetHeight() { return m_height; }
public byte GetComponent(int index) { return m_components[index]; }
/**
* Creates and initializes a Bitmap.
*
* @param width The width, in pixels, of the image.
* @param height The height, in pixels, of the image.
*/
public Bitmap(int width, int height)
{
m_width = width;
m_height = height;
m_components = new byte[m_width * m_height * 4];
}
public Bitmap(String fileName) throws IOException
{
int width = 0;
int height = 0;
byte[] components = null;
BufferedImage image = ImageIO.read(new File(fileName));
width = image.getWidth();
height = image.getHeight();
int imgPixels[] = new int[width * height];
image.getRGB(0, 0, width, height, imgPixels, 0, width);
components = new byte[width * height * 4];
for(int i = 0; i < width * height; i++)
{
int pixel = imgPixels[i];
components[i * 4] = (byte)((pixel >> 24) & 0xFF); // A
components[i * 4 + 1] = (byte)((pixel ) & 0xFF); // B
components[i * 4 + 2] = (byte)((pixel >> 8 ) & 0xFF); // G
components[i * 4 + 3] = (byte)((pixel >> 16) & 0xFF); // R
}
m_width = width;
m_height = height;
m_components = components;
}
/**
* Sets every pixel in the bitmap to a specific shade of grey.
*
* @param shade The shade of grey to use. 0 is black, 255 is white.
*/
public void Clear(byte shade)
{
Arrays.fill(m_components, shade);
}
/**
* Sets the pixel at (x, y) to the color specified by (a,b,g,r).
*
* @param x Pixel location in X
* @param y Pixel location in Y
* @param a Alpha component
* @param b Blue component
* @param g Green component
* @param r Red component
*/
public void DrawPixel(int x, int y, byte a, byte b, byte g, byte r)
{
int index = (x + y * m_width) * 4;
m_components[index ] = a;
m_components[index + 1] = b;
m_components[index + 2] = g;
m_components[index + 3] = r;
}
public void CopyPixel(int destX, int destY, int srcX, int srcY, Bitmap src, float lightAmt)
{
int destIndex = (destX + destY * m_width) * 4;
int srcIndex = (srcX + srcY * src.GetWidth()) * 4;
m_components[destIndex ] = (byte)((src.GetComponent(srcIndex) & 0xFF) * lightAmt);
m_components[destIndex + 1] = (byte)((src.GetComponent(srcIndex + 1) & 0xFF) * lightAmt);
m_components[destIndex + 2] = (byte)((src.GetComponent(srcIndex + 2) & 0xFF) * lightAmt);
m_components[destIndex + 3] = (byte)((src.GetComponent(srcIndex + 3) & 0xFF) * lightAmt);
}
/**
* Copies the Bitmap into a BGR byte array.
*
* @param dest The byte array to copy into.
*/
public void CopyToByteArray(byte[] dest)
{
for(int i = 0; i < m_width * m_height; i++)
{
dest[i * 3 ] = m_components[i * 4 + 1];
dest[i * 3 + 1] = m_components[i * 4 + 2];
dest[i * 3 + 2] = m_components[i * 4 + 3];
}
}
}
