int getRgb()

in src/main/java/org/apache/commons/imaging/formats/png/ScanExpediter.java [99:190]
66 lines of code
14 McCabe index (conditional complexity)

    int getRgb(final BitParser bitParser, final int pixelIndexInScanline)
            throws ImagingException, IOException {

        switch (pngColorType) {
        case GREYSCALE: {
            // 1,2,4,8,16 Each pixel is a grayscale sample.
            int sample = bitParser.getSampleAsByte(pixelIndexInScanline, 0);

            if (gammaCorrection != null) {
                sample = gammaCorrection.correctSample(sample);
            }

            int rgb = getPixelRgb(sample, sample, sample);

            if (transparencyFilter != null) {
                rgb = transparencyFilter.filter(rgb, sample);
            }

            return rgb;

        }
        case TRUE_COLOR: {
            // 8,16 Each pixel is an R,G,B triple.
            int red = bitParser.getSampleAsByte(pixelIndexInScanline, 0);
            int green = bitParser.getSampleAsByte(pixelIndexInScanline, 1);
            int blue = bitParser.getSampleAsByte(pixelIndexInScanline, 2);

            int rgb = getPixelRgb(red, green, blue);

            if (transparencyFilter != null) {
                rgb = transparencyFilter.filter(rgb, -1);
            }

            if (gammaCorrection != null) {
                final int alpha = (0xff000000 & rgb) >> 24; // make sure to preserve
                // transparency
                red = gammaCorrection.correctSample(red);
                green = gammaCorrection.correctSample(green);
                blue = gammaCorrection.correctSample(blue);
                rgb = getPixelArgb(alpha, red, green, blue);
            }

            return rgb;
        }
        //
        case INDEXED_COLOR: {
            // 1,2,4,8 Each pixel is a palette index;
            // a PLTE chunk must appear.
            if (pngChunkPlte == null) {
                throw new ImagingException("A PLTE chunk is required for an indexed color type.");
            }
            final int index = bitParser.getSample(pixelIndexInScanline, 0);

            int rgb = pngChunkPlte.getRgb(index);

            if (transparencyFilter != null) {
                rgb = transparencyFilter.filter(rgb, index);
            }

            return rgb;
        }
        case GREYSCALE_WITH_ALPHA: {
            // 8,16 Each pixel is a grayscale sample,
            // followed by an alpha sample.
            int sample = bitParser.getSampleAsByte(pixelIndexInScanline, 0);
            final int alpha = bitParser.getSampleAsByte(pixelIndexInScanline, 1);

            if (gammaCorrection != null) {
                sample = gammaCorrection.correctSample(sample);
            }

            return getPixelArgb(alpha, sample, sample, sample);
        }
        case TRUE_COLOR_WITH_ALPHA: {
            // 8,16 Each pixel is an R,G,B triple,
            int red = bitParser.getSampleAsByte(pixelIndexInScanline, 0);
            int green = bitParser.getSampleAsByte(pixelIndexInScanline, 1);
            int blue = bitParser.getSampleAsByte(pixelIndexInScanline, 2);
            final int alpha = bitParser.getSampleAsByte(pixelIndexInScanline, 3);

            if (gammaCorrection != null) {
                red = gammaCorrection.correctSample(red);
                green = gammaCorrection.correctSample(green);
                blue = gammaCorrection.correctSample(blue);
            }

            return getPixelArgb(alpha, red, green, blue);
        }
        default:
            throw new ImagingException("PNG: unknown color type: " + pngColorType);
        }
    }