src/main/java/org/apache/commons/imaging/formats/tiff/datareaders/ImageDataReader.java [418:466]:
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        int xR0 = xBlock - xRaster;  // xR0, yR0 coordinates relative to
        int yR0 = yBlock - yRaster; // the raster
        int xR1 = xR0 + blockWidth;
        int yR1 = yR0 + blockHeight;
        if (xR0 < 0) {
            xR0 = 0;
        }
        if (yR0 < 0) {
            yR0 = 0;
        }
        if (xR1 > rasterWidth) {
            xR1 = rasterWidth;
        }
        if (yR1 > rasterHeight) {
            yR1 = rasterHeight;
        }

        // Recall that the above logic may have adjusted xR0, xY0 so that
        // they are not necessarily point to the source pixel at xRaster, yRaster
        // we compute xSource = xR0+xRaster.
        //            xOffset = xSource-xBlock
        // since the block cannot be accessed with a negative offset,
        // we check for negatives and adjust xR0, yR0 upward as necessary
        int xB0 = xR0 + xRaster - xBlock;
        int yB0 = yR0 + yRaster - yBlock;
        if (xB0 < 0) {
            xR0 -= xB0;
            xB0 = 0;
        }
        if (yB0 < 0) {
            yR0 -= yB0;
            yB0 = 0;
        }

        int w = xR1 - xR0;
        int h = yR1 - yR0;
        if (w <= 0 || h <= 0) {
            // The call to this method put the block outside the
            // bounds of the raster.  There is nothing to do.  Ideally,
            // this situation never arises, because it would mean that
            // the data was read from the file unnecessarily.
            return;
        }
        // see if the xR1, yR1 would extend past the limits of the block
        if (w > blockWidth) {
            w = blockWidth;
        }
        if (h > blockHeight) {
            h = blockHeight;
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src/main/java/org/apache/commons/imaging/formats/tiff/datareaders/ImageDataReader.java [539:587]:
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        int xR0 = xBlock - xRaster;  // xR0, yR0 coordinates relative to
        int yR0 = yBlock - yRaster; // the raster
        int xR1 = xR0 + blockWidth;
        int yR1 = yR0 + blockHeight;
        if (xR0 < 0) {
            xR0 = 0;
        }
        if (yR0 < 0) {
            yR0 = 0;
        }
        if (xR1 > rasterWidth) {
            xR1 = rasterWidth;
        }
        if (yR1 > rasterHeight) {
            yR1 = rasterHeight;
        }

        // Recall that the above logic may have adjusted xR0, xY0 so that
        // they are not necessarily point to the source pixel at xRaster, yRaster
        // we compute xSource = xR0+xRaster.
        //            xOffset = xSource-xBlock
        // since the block cannot be accessed with a negative offset,
        // we check for negatives and adjust xR0, yR0 upward as necessary
        int xB0 = xR0 + xRaster - xBlock;
        int yB0 = yR0 + yRaster - yBlock;
        if (xB0 < 0) {
            xR0 -= xB0;
            xB0 = 0;
        }
        if (yB0 < 0) {
            yR0 -= yB0;
            yB0 = 0;
        }

        int w = xR1 - xR0;
        int h = yR1 - yR0;
        if (w <= 0 || h <= 0) {
            // The call to this method puts the block outside the
            // bounds of the raster.  There is nothing to do.  Ideally,
            // this situation never arises, because it would mean that
            // the data was read from the file unnecessarily.
            return;
        }
        // see if the xR1, yR1 would extend past the limits of the block
        if (w > blockWidth) {
            w = blockWidth;
        }
        if (h > blockHeight) {
            h = blockHeight;
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