C++ Win32 アプリを Java に変換しています (Linux の場合) bitmap の BITMAPFILEHEADER と BITMAPINFOHEADER を読み取る必要があります。Windowsに特化したjna(Javaネイティブアクセス)ライブラリを見つけました(と思います)。誰かアイデアはありますか?
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Webで検索した後、これらの構造体を自分で実装し、ビットマップファイルをバイト配列に読み取り、それらをクラスデータメンバーに解析することにしました。コードは次のとおりです
public class BitmapFileHeader {
char[] bfType;
int bfSize;
short bfReserved1;
short bfReserved2;
int bfOffBits;
private BitmapFileHeader() {
}
public static BitmapFileHeader readFromImage(byte[] image) {
BitmapFileHeader bitmap = new BitmapFileHeader();
bitmap.bfType = new char[2];
int index = 0;
bitmap.bfType[0] = (char) image[index++];
bitmap.bfType[1] = (char) image[index++];
bitmap.bfSize = (image[index + 3] & 0xff) << 24 | (image[index + 2] & 0xFF) << 16 | (image[index + 1] & 0xFF) << 8
| (image[index + 0] & 0xFF);
index += 4;
bitmap.bfReserved1 = (short) (((image[index + 1] & 0xFF) << 8) | (image[index + 0] & 0xFF));
index += 2;
bitmap.bfReserved2 = (short) (((image[index + 1] & 0xFF) << 8) | (image[index + 0] & 0xFF));
index += 2;
bitmap.bfOffBits = (image[index + 3] & 0xff) << 24 | (image[index + 2] & 0xFF) << 16 | (image[index + 1] & 0xFF) << 8
| (image[index + 0] & 0xFF);
return bitmap;
}
}
public class BitmapInfoHeader {
int biSize;
long biWidth;
long biHeight;
short biPlanes;
short biBitCount;
int biCompression;
int biSizeImage;
long biXPelsPerMeter;
long biYPelsPerMeter;
int biClrUsed;
int biClrImportant;
private BitmapInfoHeader() {
}
public static BitmapInfoHeader readFromImage(byte[] image) {
BitmapInfoHeader bitmap = new BitmapInfoHeader();
// LittleEndian order ...
int index = 14;
bitmap.biSize = (image[index + 3] & 0xff) << 24 | (image[index + 2] & 0xFF) << 16 | (image[index + 1] & 0xFF) << 8
| (image[index + 0] & 0xFF);
index += 4;
bitmap.biWidth = ((image[index + 3] & 0xff) << 24) | (image[index + 2] & 0xFF) << 16 | (image[index + 1] & 0xFF) << 8
| (image[index + 0] & 0xFF);
index += 4;
bitmap.biHeight = (image[index + 3] & 0xff) << 24 | (image[index + 2] & 0xFF) << 16 | (image[index + 1] & 0xFF) << 8
| (image[index + 0] & 0xFF);
index += 4;
bitmap.biPlanes = (short) (((image[index + 1] & 0xFF) << 8) | (image[index + 0] & 0xFF));
index += 2;
bitmap.biBitCount = (short) (((image[index + 1] & 0xFF) << 8) | (image[index + 0] & 0xFF));
index += 2;
bitmap.biCompression = (image[index + 3] & 0xff) << 24 | (image[index + 2] & 0xFF) << 16 | (image[index + 1] & 0xFF) << 8
| (image[index + 0] & 0xFF);
index += 4;
bitmap.biSizeImage = (image[index + 3] & 0xff) << 24 | (image[index + 2] & 0xFF) << 16 | (image[index + 1] & 0xFF) << 8
| (image[index + 0] & 0xFF);
index += 4;
bitmap.biXPelsPerMeter =
// ByteBuffer.wrap(image, index, index +
// 4).order(ByteOrder.LITTLE_ENDIAN).getLong();
(int) (image[index + 3] & 0xff) << 24 | (image[index + 2] & 0xFF) << 16 | (image[index + 1] & 0xFF) << 8 | (image[index + 0] & 0xFF);
index += 4;
bitmap.biYPelsPerMeter =
//ByteBuffer.wrap(image, index, index + 4).order(ByteOrder.LITTLE_ENDIAN).getLong();
(int) (image[index + 3] & 0xff) << 24 | (image[index + 2] & 0xFF) << 16 | (image[index + 1] & 0xFF) << 8 | (image[index + 0] & 0xFF);
index += 4;
bitmap.biClrUsed = (image[index + 3] & 0xff) << 24 | (image[index + 2] & 0xFF) << 16 | (image[index + 1] & 0xFF) << 8
| (image[index + 0] & 0xFF);
index += 4;
bitmap.biClrImportant = (image[index + 3] & 0xff) << 24 | (image[index + 2] & 0xFF) << 16 | (image[index + 1] & 0xFF) << 8
| (image[index + 0] & 0xFF);
index += 4;
index += 10;
return bitmap;
}
}
于 2013-05-07T04:25:44.393 に答える