darling-cocotron/Onyx2D/O2PDFFunction_Type3.m

/* Copyright (c) 2007 Christopher J. W. Lloyd

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */

#import <Foundation/NSArray.h>
#import <Onyx2D/O2PDFArray.h>
#import <Onyx2D/O2PDFContext.h>
#import <Onyx2D/O2PDFDictionary.h>
#import <Onyx2D/O2PDFFunction_Type3.h>
#import <stddef.h>

@implementation O2PDFFunction_Type3

static void evaluate(void *info, const O2Float *input, O2Float *output) {
    O2PDFFunction_Type3 *self = info;
    O2Float x = input[0];
    O2Float bounds[2], encode[2];
    NSInteger i;

    for (i = 0; i < self->_boundsCount; i++) {
        if (x < self->_bounds[i])
            break;
    }

    bounds[0] = (i == 0) ? self->_domain[0] : self->_bounds[i - 1];
    bounds[1] = (i == self->_boundsCount)
                        ? self->_domain[self->_domainCount - 1]
                        : self->_bounds[i];
    encode[0] = self->_encode[i * 2];
    encode[1] = self->_encode[i * 2 + 1];

    x -= bounds[0];
    x = (bounds[1] - bounds[0]) / x;
    x = (encode[1] - encode[0]) / x;
    x += encode[0];

    O2FunctionEvaluate(self->_functions[i], x, output);
}

- initWithDomain: (O2PDFArray *) domain
            range: (O2PDFArray *) range
        functions: (NSArray *) functions
           bounds: (O2PDFArray *) bounds
           encode: (O2PDFArray *) encode
{
    NSInteger i;

    if ([super initWithDomain: domain range: range] == nil)
        return nil;

    _info = self;
    _callbacks.evaluate = evaluate;

    if ((_functionCount = [functions count]) == 0) {
        [self dealloc];
        return nil;
    }
    _functions = NSZoneMalloc(NULL, sizeof(O2Function *) * _functionCount);
    for (i = 0; i < _functionCount; i++)
        _functions[i] = [[functions objectAtIndex: i] retain];

    if (![bounds getNumbers: &_bounds count: &_boundsCount]) {
        [self dealloc];
        return nil;
    }
    if (![encode getNumbers: &_encode count: &_encodeCount]) {
        [self dealloc];
        return nil;
    }

    if (_rangeCount == 0) {
        NSInteger i;

        for (i = 0; i < _functionCount; i++) {
            // All the functions _should_ have the same _rangeCount
            if ([_functions[i] rangeCount] > _rangeCount)
                _rangeCount = [_functions[i] rangeCount];
        }
        if (_range != NULL)
            NSZoneFree(NULL, _range);

        _range = NSZoneMalloc(NULL, sizeof(O2Float) * _rangeCount);
        for (i = 0; i < _rangeCount / 2; i++) {
            _range[i * 2] = 0;
            _range[i * 2 + 1] = 1;
        }
    }

    return self;
}

- (void) dealloc {
    NSInteger i;

    if (_functions != NULL) {
        for (i = 0; i < _functionCount; i++)
            [_functions[i] release];
        NSZoneFree(NULL, _functions);
    }

    if (_bounds != NULL)
        NSZoneFree(NULL, _bounds);
    if (_encode != NULL)
        NSZoneFree(NULL, _encode);
    [super dealloc];
}

- (BOOL) isLinear {
    if (_functionCount == 1)
        return [_functions[0] isLinear];

    return NO;
}

- (O2PDFObject *) encodeReferenceWithContext: (O2PDFContext *) context {
    O2PDFDictionary *result = [O2PDFDictionary pdfDictionary];
    NSInteger i;

    [result setIntegerForKey: "FunctionType" value: 3];
    [result setObjectForKey: "Domain"
                      value: [O2PDFArray pdfArrayWithNumbers: _domain
                                                       count: _domainCount]];
    [result setObjectForKey: "Range"
                      value: [O2PDFArray pdfArrayWithNumbers: _range
                                                       count: _rangeCount]];
    [result setObjectForKey: "Bounds"
                      value: [O2PDFArray pdfArrayWithNumbers: _bounds
                                                       count: _boundsCount]];
    [result setObjectForKey: "Encode"
                      value: [O2PDFArray pdfArrayWithNumbers: _encode
                                                       count: _encodeCount]];
    O2PDFArray *fnArray = [O2PDFArray pdfArray];
    for (i = 0; i < _functionCount; i++)
        [fnArray
                addObject: [_functions[i] encodeReferenceWithContext: context]];
    [result setObjectForKey: "Functions" value: fnArray];

    return [context encodeIndirectPDFObject: result];
}

- (NSString *) description {
    NSMutableString *result = [NSMutableString string];
    [result appendFormat: @"<%@ %p:", [self class], self];
    int i;

    for (i = 0; i < _boundsCount; i++)
        [result appendFormat: @"bounds[%d]=%f,", i, _bounds[i]];
    for (i = 0; i < _encodeCount; i++)
        [result appendFormat: @"encode[%d]=%f,", i, _encode[i]];
    for (i = 0; i < _functionCount; i++)
        [result appendFormat: @"function[%d]=%@", i, _functions[i]];
    [result appendFormat: @">"];

    return result;
}

@end