chargeur Java TGA

Question

Je cherche une petite et de l'image libre TGA classe de chargement ou de bibliothèque java. Idéalement, le résultat est un BufferedImage.

Oui, je l'ai déjà googlé, mais la plupart des résultats sont obsolètes, ou sont des bibliothèques assez grandes qui contiennent beaucoup d'autres choses que j'ai besoin. Je cherche quelque chose de petit et simple qui lit seulement des images TGA.

Merci!

Answer 1

Nous utilisons cette classe copiés d'un projet open source pour lire les fichiers TGA. Il est vraiment vieux. Il ne peut gérer les fichiers Targa avec la plupart de codage de base. Lui donner un essai.

public class TargaReader
{
        public static Image getImage(String fileName) throws IOException
        {
                File f = new File(fileName);
                byte[] buf = new byte[(int)f.length()];
                BufferedInputStream bis = new BufferedInputStream(new FileInputStream(f));
                bis.read(buf);
                bis.close();
                return decode(buf);
        }

        private static int offset;

        private static int btoi(byte b)
        {
                int a = b;
                return (a<0?256+a:a);
        }

        private static int read(byte[] buf)
        {
                return btoi(buf[offset++]);
        }

        public static Image decode(byte[] buf) throws IOException
        {
                offset = 0;

                // Reading header
                for (int i=0;i<12;i++)
                        read(buf);
                int width = read(buf)+(read(buf)<<8);
                int height = read(buf)+(read(buf)<<8);
                read(buf);
                read(buf);

                // Reading data
                int n = width*height;
                int[] pixels = new int[n];
                int idx=0;

                while (n>0)
                {
                        int nb = read(buf);
                        if ((nb&0x80)==0)
                        {
                                for (int i=0;i<=nb;i++)
                                {
                                        int b = read(buf);
                                        int g = read(buf);
                                        int r = read(buf);
                                        pixels[idx++] = 0xff000000 | (r<<16) | (g<<8) | b;
                                }
                        }
                        else
                        {
                                nb &= 0x7f;
                                int b = read(buf);
                                int g = read(buf);
                                int r = read(buf);
                                int v = 0xff000000 | (r<<16) | (g<<8) | b;
                                for (int i=0;i<=nb;i++)
                                        pixels[idx++] = v;
                        }
                        n-=nb+1;
                }

                BufferedImage bimg = new BufferedImage(width,height,BufferedImage.TYPE_INT_ARGB);
                bimg.setRGB(0,0,width,height,pixels,0,width);
                return bimg;
        }
}

Answer 2

J'avais images non compressées targa Nous avons donc dû modifier le code exemple. Voici ma modifier il devrait soutenir BGR non compressé targa 24bit et 32bit BGRA

// http://paulbourke.net/dataformats/tga/
// little endian multi-byte integers: "low-order byte,high-order byte"
//          00,04 -> 04,00 -> 1024
class TargaReader {
        public static BufferedImage getImage(String fileName) throws IOException {
                File f = new File(fileName);
                byte[] buf = new byte[(int)f.length()];
                BufferedInputStream bis = new BufferedInputStream(new FileInputStream(f));
                bis.read(buf);
                bis.close();
                return decode(buf);
        }

        private static int offset;

        private static int btoi(byte b) {
                int a = b;
                return (a<0?256+a:a);
        }

        private static int read(byte[] buf) {
                return btoi(buf[offset++]);
        }

        public static BufferedImage decode(byte[] buf) throws IOException {
                offset = 0;

                // Reading header bytes
                // buf[2]=image type code 0x02=uncompressed BGR or BGRA
                // buf[12]+[13]=width
                // buf[14]+[15]=height
                // buf[16]=image pixel size 0x20=32bit, 0x18=24bit 
                // buf{17]=Image Descriptor Byte=0x28 (00101000)=32bit/origin upperleft/non-interleaved
                for (int i=0;i<12;i++)
                        read(buf);
                int width = read(buf)+(read(buf)<<8);   // 00,04=1024
                int height = read(buf)+(read(buf)<<8);  // 40,02=576
                read(buf);
                read(buf);

                int n = width*height;
                int[] pixels = new int[n];
                int idx=0;

                if (buf[2]==0x02 && buf[16]==0x20) { // uncompressed BGRA
                    while(n>0) {
                        int b = read(buf);
                        int g = read(buf);
                        int r = read(buf);
                        int a = read(buf);
                        int v = (a<<24) | (r<<16) | (g<<8) | b;
                        pixels[idx++] = v;
                        n-=1;
                    }
                } else if (buf[2]==0x02 && buf[16]==0x18) {  // uncompressed BGR
                    while(n>0) {
                        int b = read(buf);
                        int g = read(buf);
                        int r = read(buf);
                        int a = 255; // opaque pixel
                        int v = (a<<24) | (r<<16) | (g<<8) | b;
                        pixels[idx++] = v;
                        n-=1;
                    }
                } else {
                    // RLE compressed
                    while (n>0) {
                        int nb = read(buf); // num of pixels
                        if ((nb&0x80)==0) { // 0x80=dec 128, bits 10000000
                            for (int i=0;i<=nb;i++) {
                                int b = read(buf);
                                int g = read(buf);
                                int r = read(buf);
                                pixels[idx++] = 0xff000000 | (r<<16) | (g<<8) | b;
                            }
                        } else {
                            nb &= 0x7f;
                            int b = read(buf);
                            int g = read(buf);
                            int r = read(buf);
                            int v = 0xff000000 | (r<<16) | (g<<8) | b;
                            for (int i=0;i<=nb;i++)
                                pixels[idx++] = v;
                        }
                        n-=nb+1;
                    }
                }

                BufferedImage bimg = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
                bimg.setRGB(0, 0, width,height, pixels, 0,width);
                return bimg;
        }
}

Answer 3

J'ai ajouté une copie autonome de la réalité bibliothèque interactive ImageIO TGA ici (LGPL):

  

https://github.com/tmyroadctfig/com.realityinteractive.imageio.tga

Il suffit d'ajouter le fichier jar à votre classpath et vous inscrire ImageIO:

IIORegistry registry = IIORegistry.getDefaultInstance();
registry.registerServiceProvider(
    new com.realityinteractive.imageio.tga.TGAImageReaderSpi());

Answer 4

Juste au cas où quelqu'un est à la recherche de la version Android de ce (que je devais remplacer BufferedImage avec Bitmap).

class TargaReader {
    public static Bitmap getImage(String fileName) throws IOException {
        File f = new File(fileName);
        byte[] buf = new byte[(int) f.length()];
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(f));
        bis.read(buf);
        bis.close();
        return decode(buf);
    }

    private static int offset;

    private static int btoi(byte b) {
        int a = b;
        return (a < 0 ? 256 + a : a);
    }

    private static int read(byte[] buf) {
        return btoi(buf[offset++]);
    }

    public static Bitmap decode(byte[] buf) throws IOException {
        offset = 0;

        // Reading header bytes
        // buf[2]=image type code 0x02=uncompressed BGR or BGRA
        // buf[12]+[13]=width
        // buf[14]+[15]=height
        // buf[16]=image pixel size 0x20=32bit, 0x18=24bit
        // buf{17]=Image Descriptor Byte=0x28 (00101000)=32bit/origin 
        //         upperleft/non-interleaved
        for (int i = 0; i < 12; i++)
            read(buf);
        int width = read(buf) + (read(buf) << 8);   // 00,04=1024
        int height = read(buf) + (read(buf) << 8);  // 40,02=576
        read(buf);
        read(buf);

        int n = width * height;
        int[] pixels = new int[n];
        int idx = 0;

        if (buf[2] == 0x02 && buf[16] == 0x20) { // uncompressed BGRA
            while (n > 0) {
                int b = read(buf);
                int g = read(buf);
                int r = read(buf);
                int a = read(buf);
                int v = (a << 24) | (r << 16) | (g << 8) | b;
                pixels[idx++] = v;
                n -= 1;
            }
        } else if (buf[2] == 0x02 && buf[16] == 0x18) {  // uncompressed BGR
            while (n > 0) {
                int b = read(buf);
                int g = read(buf);
                int r = read(buf);
                int a = 255; // opaque pixel
                int v = (a << 24) | (r << 16) | (g << 8) | b;
                pixels[idx++] = v;
                n -= 1;
            }
        } else {
            // RLE compressed
            while (n > 0) {
                int nb = read(buf); // num of pixels
                if ((nb & 0x80) == 0) { // 0x80=dec 128, bits 10000000
                    for (int i = 0; i <= nb; i++) {
                        int b = read(buf);
                        int g = read(buf);
                        int r = read(buf);
                        pixels[idx++] = 0xff000000 | (r << 16) | (g << 8) | b;
                    }
                } else {
                    nb &= 0x7f;
                    int b = read(buf);
                    int g = read(buf);
                    int r = read(buf);
                    int v = 0xff000000 | (r << 16) | (g << 8) | b;
                    for (int i = 0; i <= nb; i++)
                        pixels[idx++] = v;
                }
                n -= nb + 1;
            }
        }

        Bitmap bimg = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        bimg.setPixels(pixels, 0, width, 0, 0, width, height);
        return bimg;
    }
}

Answer 5

Merci pour le partager!

Je l'ai apporté quelques modifications pour améliorer les performances. Je ne fait BGRA 32 bits Décrypter de fichier, mais il peut aider les autres personnes.

public static BufferedImage createTGAImage(byte[] buff) throws IOException {
    int offset = 0, width = 0, height = 0;
    int[] tgaBuffer = null;

    if (buff[2] == 0x02) { // BGRA File

        offset = 12;
        width = (buff[offset + 1] << 8 | buff[offset]);

        offset = 14;
        height = (buff[offset + 1] << 8 | buff[offset]);

        int colorDepth = buff[offset + 2];

        if (colorDepth == 0x20) { // 32 bits depth
            offset = 18;

            int count = width * height;
            tgaBuffer = new int[count];

            for (int i = 0; i < count; i++) {
                byte b = buff[offset++]; //This is for didatic prupose, you can remove it and make inline covert.
                byte g = buff[offset++];
                byte r = buff[offset++];
                byte a = buff[offset++];

                tgaBuffer[i] = ((a & 0xFF) << 24 | (r & 0xFF) << 16 | (g & 0xFF)<< 8 | b & 0xFF);
            }
        }
    }

    BufferedImage result = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
    result.setRGB(0, 0, width, height, tgaBuffer, 0, width);

    return result;
}