diff options
Diffstat (limited to 'libjava/classpath/gnu/javax/imageio/bmp/BMPInfoHeader.java')
| -rw-r--r-- | libjava/classpath/gnu/javax/imageio/bmp/BMPInfoHeader.java | 380 |
1 files changed, 248 insertions, 132 deletions
diff --git a/libjava/classpath/gnu/javax/imageio/bmp/BMPInfoHeader.java b/libjava/classpath/gnu/javax/imageio/bmp/BMPInfoHeader.java index edcb4e644cc..a9f1ffda7e5 100644 --- a/libjava/classpath/gnu/javax/imageio/bmp/BMPInfoHeader.java +++ b/libjava/classpath/gnu/javax/imageio/bmp/BMPInfoHeader.java @@ -37,49 +37,55 @@ exception statement from your version. */ package gnu.javax.imageio.bmp; +import java.awt.Dimension; +import java.awt.image.ColorModel; +import java.awt.image.RenderedImage; import java.io.IOException; -import javax.imageio.stream.ImageInputStream; -import java.io.OutputStream; import java.nio.ByteBuffer; import java.nio.ByteOrder; -import java.awt.Dimension; -public class BMPInfoHeader { - /** Size of the bitmap info header*/ - private int biSize; +import javax.imageio.IIOImage; +import javax.imageio.ImageWriteParam; +import javax.imageio.stream.ImageInputStream; +import javax.imageio.stream.ImageOutputStream; + +public class BMPInfoHeader +{ + /** Size of the bitmap info header */ + protected int biSize; - /** Pixel width of the bitmap */ - private int biWidth; + /** Pixel width of the bitmap */ + protected int biWidth; - /** Pixel height of the bitmap */ - private int biHeight; + /** Pixel height of the bitmap */ + protected int biHeight; - /** Number of bitplanes = 1 */ - private short biPlanes; + /** Number of bitplanes = 1 */ + protected short biPlanes; - /** Number of bpp = 1,4,8,24 */ - private short biBitCount; + /** Number of bpp = 1,4,8,24 */ + protected short biBitCount; - /** Compression type, RGB8, RLE8, RLE4, BITFIELDS */ - private int biCompression; + /** Compression type, RGB8, RLE8, RLE4, BITFIELDS */ + protected int biCompression; - /** Byte size of the uncompressed bitmap, can be 0. */ - private int biSizeImage; + /** Byte size of the uncompressed bitmap, can be 0. */ + protected int biSizeImage; - /** X resolution, dots per meter */ - private int biXPelsPerMeter; + /** X resolution, dots per meter */ + protected int biXPelsPerMeter; - /** Y resolution, dots per meter */ - private int biYPelsPerMeter; + /** Y resolution, dots per meter */ + protected int biYPelsPerMeter; - /** Number of colors used (palette only, can be 0 for all) */ - private int biClrUsed; + /** Number of colors used (palette only, can be 0 for all) */ + protected int biClrUsed; - /** Number of 'important' colors, 0 for all */ - private int biClrImportant; + /** Number of 'important' colors, 0 for all */ + protected int biClrImportant; - /** BITMAPINFOHEADER is 40 bytes */ - public static final int SIZE = 40; + /** BITMAPINFOHEADER is 40 bytes */ + public static final int SIZE = 40; /** * Compression types @@ -91,111 +97,221 @@ public class BMPInfoHeader { /** * Creates the header from an input stream, which is not closed. + * + * @param in - the image input stream * @throws IOException if an I/O error occured. * @throws BMPException if the header was invalid */ - public BMPInfoHeader(ImageInputStream in) throws IOException, BMPException { - byte[] data = new byte[SIZE]; - - if (in.read(data) != SIZE) - throw new IOException("Couldn't read header."); - ByteBuffer buf = ByteBuffer.wrap(data); - buf.order(ByteOrder.LITTLE_ENDIAN); - - int n; - if((n=buf.getInt()) != SIZE) - throw new BMPException("Invalid BITMAPINFOHEADER size: "+n); - - biWidth = buf.getInt(); - biHeight = buf.getInt(); - biPlanes = buf.getShort(); - setBitCount(buf.getShort()); - setCompression(buf.getInt()); - biSizeImage = buf.getInt(); - biXPelsPerMeter = buf.getInt(); - biYPelsPerMeter = buf.getInt(); - biClrUsed = buf.getInt(); - biClrImportant = buf.getInt(); - } - - public void setBitCount(short bitcount) throws BMPException { - switch(bitcount){ - case 1: - case 4: - case 8: - case 16: - case 24: - case 32: - biBitCount = bitcount; - break; - - default: - throw new BMPException("Invalid number of bits per pixel: "+ - bitcount); - } - } - - public short getBitCount() { return biBitCount; } - - public void setCompression(int compression) throws BMPException { - switch(compression){ - case BI_RLE8: - if(getBitCount() != 8) - throw new BMPException("Invalid number of bits per pixel."); - biCompression = compression; - break; - case BI_RLE4: - if(getBitCount() != 4) - throw new BMPException("Invalid number of bits per pixel."); - biCompression = compression; - break; - - case BI_RGB: - case BI_BITFIELDS: - biCompression = compression; - break; - - default: - throw new BMPException("Unknown bitmap compression type."); - } - } - - public int getNumberOfPaletteEntries(){ - if(biClrUsed == 0) - switch(biBitCount){ - case 1: - return 2; - case 4: - return 16; - case 8: - return 256; - - default: // should not happen - return 0; - } - - return biClrUsed; - } - - public int getCompression(){ - return biCompression; - } - - public Dimension getSize(){ - return new Dimension(biWidth, biHeight); - } - - public int getWidth(){ - return biWidth; - } - - public int getHeight(){ - return biHeight; - } - - public void setSize(Dimension d){ - biWidth = (int)d.getWidth(); - biHeight = (int)d.getHeight(); - } - + public BMPInfoHeader(ImageInputStream in) throws IOException, BMPException + { + byte[] data = new byte[SIZE]; + + if (in.read(data) != SIZE) + throw new IOException("Couldn't read header."); + ByteBuffer buf = ByteBuffer.wrap(data); + buf.order(ByteOrder.LITTLE_ENDIAN); + + int n; + if ((n = buf.getInt()) != SIZE) + throw new BMPException("Invalid BITMAPINFOHEADER size: " + n); + + biWidth = buf.getInt(); + biHeight = buf.getInt(); + biPlanes = buf.getShort(); + setBitCount(buf.getShort()); + setCompression(buf.getInt()); + biSizeImage = buf.getInt(); + biXPelsPerMeter = buf.getInt(); + biYPelsPerMeter = buf.getInt(); + biClrUsed = buf.getInt(); + biClrImportant = buf.getInt(); + } + + /** + * Creates the info header from an output stream, which is not closed. + * + * @param out - the image output stream + * @param im - the image + * @param param - the image write param. + * @throws IOException if an I/O error occured. + */ + public BMPInfoHeader(ImageOutputStream out, IIOImage im, ImageWriteParam param) throws IOException + { + RenderedImage img = im.getRenderedImage(); + ColorModel cMod = img.getColorModel(); + + biSize = SIZE; + biWidth = img.getWidth(); + biHeight = img.getHeight(); + biPlanes = 1; + + if (param != null && param.canWriteCompressed()) + { + String compType = param.getCompressionType(); + if (compType.equals("BI_RLE8")) + { + biCompression = BI_RLE8; + biBitCount = 8; + } + else if (compType.equals("BI_RLE4")) + { + biCompression = BI_RLE4; + biBitCount = 4; + } + else + { + biCompression = BI_RGB; + biBitCount = (short) cMod.getPixelSize(); + } + } + else + { + biBitCount = (short) cMod.getPixelSize(); + biCompression = BI_RGB; + } + + biXPelsPerMeter = 0x0; + biYPelsPerMeter = 0x0; + biClrUsed = 0; + biClrImportant = 0; + biSizeImage = ((biWidth * biHeight) * 3) + + ((4 - ((biWidth * 3) % 4)) * biHeight); + out.write(intToDWord(biSize)); + out.write(intToDWord(biWidth)); + out.write(intToDWord(biHeight)); + out.write(intToWord(biPlanes)); + out.write(intToWord(biBitCount)); + out.write(intToDWord(biCompression)); + out.write(intToDWord(biSizeImage)); + out.write(intToDWord(biXPelsPerMeter)); + out.write(intToDWord(biYPelsPerMeter)); + out.write(intToDWord(biClrUsed)); + out.write(intToDWord(biClrImportant)); + } + + /** + * Converts an int to a word, where the return value is stored in a + * 2-byte array. + * + * @param val - the value to convert + * @return the array + */ + private byte[] intToWord(int val) + { + byte b[] = new byte[2]; + b[0] = (byte) (val & 0x00FF); + b[1] = (byte) ((val >> 8) & 0x00FF); + return b; + } + + /** + * Converts an int to a double word, where the return value is + * stored in a 4-byte array. + * + * @param val - the value to convert + * @return the array + */ + private byte[] intToDWord(int val) + { + byte b[] = new byte[4]; + b[0] = (byte) (val & 0x00FF); + b[1] = (byte) ((val >> 8) & 0x000000FF); + b[2] = (byte) ((val >> 16) & 0x000000FF); + b[3] = (byte) ((val >> 24) & 0x000000FF); + return b; + } + + + public void setBitCount(short bitcount) throws BMPException + { + switch (bitcount) + { + case 1: + case 4: + case 8: + case 16: + case 24: + case 32: + biBitCount = bitcount; + break; + + default: + throw new BMPException("Invalid number of bits per pixel: " + bitcount); + } + } + + public short getBitCount() + { + return biBitCount; + } + + public void setCompression(int compression) throws BMPException + { + switch (compression) + { + case BI_RLE8: + if (getBitCount() != 8) + throw new BMPException("Invalid number of bits per pixel."); + biCompression = compression; + break; + case BI_RLE4: + if (getBitCount() != 4) + throw new BMPException("Invalid number of bits per pixel."); + biCompression = compression; + break; + + case BI_RGB: + case BI_BITFIELDS: + biCompression = compression; + break; + + default: + throw new BMPException("Unknown bitmap compression type."); + } + } + + public int getNumberOfPaletteEntries() + { + if (biClrUsed == 0) + switch (biBitCount) + { + case 1: + return 2; + case 4: + return 16; + case 8: + return 256; + + default: // should not happen + return 0; + } + + return biClrUsed; + } + + public int getCompression() + { + return biCompression; + } + + public Dimension getSize() + { + return new Dimension(biWidth, biHeight); + } + + public int getWidth() + { + return biWidth; + } + + public int getHeight() + { + return biHeight; + } + + public void setSize(Dimension d) + { + biWidth = (int) d.getWidth(); + biHeight = (int) d.getHeight(); + } } |