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Java讀取BMP文件

各位老大，幫我看看代碼

???????? // ?The?DataInputStream?allows?you?to?read?in?16?and?32?bit?numbers

????????DataInputStream?in? = ? new ?DataInputStream(instream);

????????DataOutputStream?out = new ?DataOutputStream(outstream);

???????? // ?Verify?that?the?header?starts?with?'BM'

???????? if ?(in.read()? != ? ' B ' )? {

???????????? throw ? new ?IOException( " Not?a?.BMP?file " );

????????}

????????out.write( ' B ' );

????????

???????? if ?(in.read()? != ? ' M ' )? {

???????????? throw ? new ?IOException( " Not?a?.BMP?file " );

????????}

????????out.write( ' M ' );

????????

???????? // ?????Get?the?total?file?size

???????? int ?fileSize? = ?intelInt(in.readInt());

????????out.writeInt(intelInt(fileSize));

???????? // ?????Skip?the?2?16-bit?reserved?words

????????out.writeShort(in.readUnsignedShort());

???????? int ?bitmapOffset? = ?intelInt(in.readInt());

????????out.writeInt(intelInt(bitmapOffset));

???????? int ?bitmapInfoSize? = ?intelInt(in.readInt());

????????out.writeInt(intelInt(bitmapInfoSize));

????????

???????? int ?width? = ?intelInt(in.readInt());

????????out.writeInt(intelInt(width));

???????? int ?height? = ?intelInt(in.readInt());

????????out.writeInt(intelInt(height));

????????

// ?Skip?the?16-bit?bitplane?size

????????out.writeShort(in.readUnsignedShort());

???????? int ?bitCount? = ?intelShort(in.readUnsignedShort());

????????out.writeShort(intelShort(bitCount));

???????? int ?compressionType? = ?intelInt(in.readInt());

????????out.writeInt(intelInt(compressionType));

???????? int ?imageSize? = ?intelInt(in.readInt());

????????out.writeInt(intelInt(imageSize));

// ?Skip?pixels?per?meter

????????out.writeInt(in.readInt());

???????? int ?colorsUsed? = ?intelInt(in.readInt());

????????out.writeInt(intelInt(colorsUsed));

???????? int ?colorsImportant? = ?intelInt(in.readInt());

????????out.writeInt(intelInt(colorsImportant));

????????System.out.println( " [colorused]= " + colorsUsed);

// ?Read?the?pixels?from?the?stream?based?on?the?compression?type

???????? if ?(compressionType? == ?BI_RGB)? {

???????????? if ?(bitCount? == ? 24 )? {

????????????????readRGB24(width,?height,?in,?out);

????????????}

????????} ?

????}

???? protected ? static ? void ?readRGB24( int ?width,? int ?height,

????????DataInputStream?in,?OutputStream?out)

???? throws ?IOException

???? {

// ?Start?storing?at?the?bottom?of?the?array

???????? for ?( int ?h? = ?height - 1 ;?h? >= ? 0 ;?h -- )? {

????????? for ?( int ?w? = ? 0 ;?w? < ?width;?w ++ )? {

// ?Read?in?the?red,?green,?and?blue?components

?????????? int ?red? = ?in.read();

?????????? int ?green? = ?in.read();

?????????? int ?blue? = ?in.read();

??????????out.write(red);

??????????out.write(green);

??????????out.write(blue);

????????????}

????????}

????}

posted on 2006-06-06 10:29 david.turing 閱讀(1851) 評論(2) 編輯收藏

# re: Java讀取BMP文件 2007-11-07 17:45 zouni

# re: Java讀取BMP文件 2007-11-07 17:52 david.turing

David.Turing's blog

Java讀取BMP文件

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