private void parse_bKGD_chunk()

in src/main/java/org/apache/xmlgraphics/image/codec/png/PNGRed.java [1009:1064]

• 51 lines of code
• 14 McCabe index (conditional complexity)

    private void parse_bKGD_chunk(PNGChunk chunk) {
        switch (colorType) {
        case PNG_COLOR_PALETTE:
            int bkgdIndex = chunk.getByte(0) & 0xff;

            bkgdRed   = redPalette[bkgdIndex]   & 0xff;
            bkgdGreen = greenPalette[bkgdIndex] & 0xff;
            bkgdBlue  = bluePalette[bkgdIndex]  & 0xff;

            if (encodeParam != null) {
                ((PNGEncodeParam.Palette)encodeParam).setBackgroundPaletteIndex(bkgdIndex);
            }
            break;
        case PNG_COLOR_GRAY: case PNG_COLOR_GRAY_ALPHA:
            int bkgdGray = chunk.getInt2(0);
            bkgdRed = bkgdGreen = bkgdBlue = bkgdGray;

            if (encodeParam != null) {
                ((PNGEncodeParam.Gray)encodeParam).setBackgroundGray(bkgdGray);
            }
            break;
        case PNG_COLOR_RGB: case PNG_COLOR_RGB_ALPHA:
            bkgdRed = chunk.getInt2(0);
            bkgdGreen = chunk.getInt2(2);
            bkgdBlue = chunk.getInt2(4);

            int[] bkgdRGB = new int[3];
            bkgdRGB[0] = bkgdRed;
            bkgdRGB[1] = bkgdGreen;
            bkgdRGB[2] = bkgdBlue;
            if (encodeParam != null) {
                ((PNGEncodeParam.RGB)encodeParam).setBackgroundRGB(bkgdRGB);
            }
            break;
        }

        if (emitProperties) {
            int r = 0;
            int g = 0;
            int b = 0;
            if ((colorType == PNG_COLOR_PALETTE) || (bitDepth == 8)) {
                r = bkgdRed;
                g = bkgdGreen;
                b = bkgdBlue;
            } else if (bitDepth < 8) {
                r = expandBits[bitDepth][bkgdRed];
                g = expandBits[bitDepth][bkgdGreen];
                b = expandBits[bitDepth][bkgdBlue];
            } else if (bitDepth == 16) {
                r = bkgdRed >> 8;
                g = bkgdGreen >> 8;
                b = bkgdBlue >> 8;
            }
            properties.put("background_color", new Color(r, g, b));
        }
    }