Examples with ExecutionContext org.apache.pdfbox.pdmodel.common.function.type4.ExecutionContext used on opensource projects

Example 1 with ExecutionContext

use of org.apache.pdfbox.pdmodel.common.function.type4.ExecutionContext in project pdfbox by apache.

the class PDFunctionType4 method eval.

/**
 * {@inheritDoc}
 */
@Override
public float[] eval(float[] input) throws IOException {
    // Setup the input values
    ExecutionContext context = new ExecutionContext(OPERATORS);
    for (int i = 0; i < input.length; i++) {
        PDRange domain = getDomainForInput(i);
        float value = clipToRange(input[i], domain.getMin(), domain.getMax());
        context.getStack().push(value);
    }
    // Execute the type 4 function.
    instructions.execute(context);
    // Extract the output values
    int numberOfOutputValues = getNumberOfOutputParameters();
    int numberOfActualOutputValues = context.getStack().size();
    if (numberOfActualOutputValues < numberOfOutputValues) {
        throw new IllegalStateException("The type 4 function returned " + numberOfActualOutputValues + " values but the Range entry indicates that " + numberOfOutputValues + " values be returned.");
    }
    float[] outputValues = new float[numberOfOutputValues];
    for (int i = numberOfOutputValues - 1; i >= 0; i--) {
        PDRange range = getRangeForOutput(i);
        outputValues[i] = context.popReal();
        outputValues[i] = clipToRange(outputValues[i], range.getMin(), range.getMax());
    }
    // Return the resulting array
    return outputValues;
}