Examples with DecodeOptions com.tom_roush.pdfbox.filter.DecodeOptions used on opensource projects

Example 1 with DecodeOptions

use of com.tom_roush.pdfbox.filter.DecodeOptions in project PdfBox-Android by TomRoush.

the class SampledImageReader method from1Bit.

private static Bitmap from1Bit(PDImage pdImage, Rect clipped, final int subsampling, final int width, final int height) throws IOException {
    int currentSubsampling = subsampling;
    final PDColorSpace colorSpace = pdImage.getColorSpace();
    final float[] decode = getDecodeArray(pdImage);
    Bitmap raster = Bitmap.createBitmap(width, height, Bitmap.Config.ALPHA_8);
    ByteBuffer buffer = ByteBuffer.allocate(raster.getRowBytes() * height);
    raster.copyPixelsToBuffer(buffer);
    byte[] output;
    DecodeOptions options = new DecodeOptions(currentSubsampling);
    options.setSourceRegion(clipped);
    // read bit stream
    InputStream iis = null;
    try {
        // create stream
        iis = pdImage.createInputStream(options);
        final int inputWidth;
        final int startx;
        final int starty;
        final int scanWidth;
        final int scanHeight;
        if (options.isFilterSubsampled()) {
            // Decode options were honored, and so there is no need for additional clipping or subsampling
            inputWidth = width;
            startx = 0;
            starty = 0;
            scanWidth = width;
            scanHeight = height;
            currentSubsampling = 1;
        } else {
            // Decode options not honored, so we need to clip and subsample ourselves.
            inputWidth = pdImage.getWidth();
            startx = clipped.left;
            starty = clipped.top;
            scanWidth = clipped.width();
            scanHeight = clipped.height();
        }
        output = buffer.array();
        // colorSpace instanceof PDIndexed; TODO: PdfBox-Android
        final boolean isIndexed = false;
        int rowLen = inputWidth / 8;
        if (inputWidth % 8 > 0) {
            rowLen++;
        }
        // read stream
        byte value0;
        byte value1;
        if (isIndexed || decode[0] < decode[1]) {
            value0 = 0;
            value1 = (byte) 255;
        } else {
            value0 = (byte) 255;
            value1 = 0;
        }
        byte[] buff = new byte[rowLen];
        int idx = 0;
        for (int y = 0; y < starty + scanHeight; y++) {
            int x = 0;
            int readLen = iis.read(buff);
            if (y < starty || y % currentSubsampling > 0) {
                continue;
            }
            for (int r = 0; r < rowLen && r < readLen; r++) {
                int value = buff[r];
                int mask = 128;
                for (int i = 0; i < 8; i++) {
                    if (x >= startx + scanWidth) {
                        break;
                    }
                    int bit = value & mask;
                    mask >>= 1;
                    if (x >= startx && x % currentSubsampling == 0) {
                        output[idx++] = bit == 0 ? value0 : value1;
                    }
                    x++;
                }
            }
            if (readLen != rowLen) {
                Log.w("PdfBox-Android", "premature EOF, image will be incomplete");
                break;
            }
        }
        buffer.rewind();
        raster.copyPixelsFromBuffer(buffer);
        // use the color space to convert the image to RGB
        return colorSpace.toRGBImage(raster);
    } finally {
        if (iis != null) {
            iis.close();
        }
    }
}

Example 2 with DecodeOptions

use of com.tom_roush.pdfbox.filter.DecodeOptions in project PdfBox-Android by TomRoush.

the class SampledImageReader method from8bit.

// faster, 8-bit non-decoded, non-colormasked image conversion
private static Bitmap from8bit(PDImage pdImage, Rect clipped, final int subsampling, final int width, final int height) throws IOException {
    int currentSubsampling = subsampling;
    DecodeOptions options = new DecodeOptions(currentSubsampling);
    options.setSourceRegion(clipped);
    InputStream input = pdImage.createInputStream(options);
    try {
        final int inputWidth;
        final int startx;
        final int starty;
        final int scanWidth;
        final int scanHeight;
        if (options.isFilterSubsampled()) {
            // Decode options were honored, and so there is no need for additional clipping or subsampling
            inputWidth = width;
            startx = 0;
            starty = 0;
            scanWidth = width;
            scanHeight = height;
            currentSubsampling = 1;
        } else {
            // Decode options not honored, so we need to clip and subsample ourselves.
            inputWidth = pdImage.getWidth();
            startx = clipped.left;
            starty = clipped.top;
            scanWidth = clipped.width();
            scanHeight = clipped.height();
        }
        final int numComponents = pdImage.getColorSpace().getNumberOfComponents();
        // get the raster's underlying byte buffer
        int[] banks = new int[width * height];
        // byte[][] banks = ((DataBufferByte) raster.getDataBuffer()).getBankData();
        byte[] tempBytes = new byte[numComponents * inputWidth];
        // compromise between memory and time usage:
        // reading the whole image consumes too much memory
        // reading one pixel at a time makes it slow in our buffering infrastructure
        int i = 0;
        for (int y = 0; y < starty + scanHeight; ++y) {
            input.read(tempBytes);
            if (y < starty || y % currentSubsampling > 0) {
                continue;
            }
            for (int x = startx; x < startx + scanWidth; x += currentSubsampling) {
                int tempBytesIdx = x * numComponents;
                if (numComponents == 3) {
                    banks[i] = Color.argb(255, tempBytes[tempBytesIdx] & 0xFF, tempBytes[tempBytesIdx + 1] & 0xFF, tempBytes[tempBytesIdx + 2] & 0xFF);
                } else if (numComponents == 1) {
                    int in = tempBytes[tempBytesIdx] & 0xFF;
                    banks[i] = Color.argb(in, in, in, in);
                }
                ++i;
            }
        }
        Bitmap raster = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        raster.setPixels(banks, 0, width, 0, 0, width, height);
        // return pdImage.getColorSpace().toRGBImage(raster); TODO: PdfBox-Android
        return raster;
    } finally {
        IOUtils.closeQuietly(input);
    }
}