Java Code Examples for javax.imageio.ImageWriteParam#getSubsamplingYOffset()

The following examples show how to use javax.imageio.ImageWriteParam#getSubsamplingYOffset() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: GIFImageWriter.java    From jdk1.8-source-analysis with Apache License 2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 2
Source File: GIFImageWriter.java    From dragonwell8_jdk with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 3
Source File: GIFImageWriter.java    From TencentKona-8 with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 4
Source File: GIFImageWriter.java    From jdk8u60 with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 5
Source File: GIFImageWriter.java    From JDKSourceCode1.8 with MIT License 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 6
Source File: GIFImageWriter.java    From openjdk-jdk8u with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 7
Source File: GIFImageWriter.java    From openjdk-jdk8u-backup with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 8
Source File: GIFImageWriter.java    From Bytecoder with Apache License 2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 9
Source File: GIFImageWriter.java    From openjdk-jdk9 with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 10
Source File: GIFImageWriter.java    From jdk8u-jdk with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 11
Source File: GIFImageWriter.java    From hottub with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 12
Source File: GIFImageWriter.java    From openjdk-8-source with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 13
Source File: GIFImageWriter.java    From openjdk-8 with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 14
Source File: GIFImageWriter.java    From jdk8u_jdk with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 15
Source File: GIFImageWriter.java    From jdk8u-jdk with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}
Example 16
Source File: GIFImageWriter.java    From jdk8u-dev-jdk with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Compute the source region and destination dimensions taking any
 * parameter settings into account.
 */
private static void computeRegions(Rectangle sourceBounds,
                                   Dimension destSize,
                                   ImageWriteParam p) {
    ImageWriteParam param;
    int periodX = 1;
    int periodY = 1;
    if (p != null) {
        int[] sourceBands = p.getSourceBands();
        if (sourceBands != null &&
            (sourceBands.length != 1 ||
             sourceBands[0] != 0)) {
            throw new IllegalArgumentException("Cannot sub-band image!");
        }

        // Get source region and subsampling factors
        Rectangle sourceRegion = p.getSourceRegion();
        if (sourceRegion != null) {
            // Clip to actual image bounds
            sourceRegion = sourceRegion.intersection(sourceBounds);
            sourceBounds.setBounds(sourceRegion);
        }

        // Adjust for subsampling offsets
        int gridX = p.getSubsamplingXOffset();
        int gridY = p.getSubsamplingYOffset();
        sourceBounds.x += gridX;
        sourceBounds.y += gridY;
        sourceBounds.width -= gridX;
        sourceBounds.height -= gridY;

        // Get subsampling factors
        periodX = p.getSourceXSubsampling();
        periodY = p.getSourceYSubsampling();
    }

    // Compute output dimensions
    destSize.setSize((sourceBounds.width + periodX - 1)/periodX,
                     (sourceBounds.height + periodY - 1)/periodY);
    if (destSize.width <= 0 || destSize.height <= 0) {
        throw new IllegalArgumentException("Empty source region!");
    }
}