darling-cocotron/Onyx2D/O2PDFFunction_Type0.m

/* Copyright (c) 2010 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_Type0.h>
#import <stddef.h>

@implementation O2PDFFunction_Type0

static void evaluate(void *info, const O2Float *input, O2Float *output) {
    O2PDFFunction_Type0 *self = info;

    if (self->_sizeCount != 1) {
        O2PDFError(__FILE__, __LINE__, @"Type0 can not handle size count!=1");
        return;
    }

    if (self->_domainCount / 2 != 1) {
        O2PDFError(__FILE__, __LINE__,
                   @"Type0 can not handle size more than one input");
        return;
    }

    if (self->_bitsPerSample != 8) {
        O2PDFError(__FILE__, __LINE__, @"Type0 can not handle bps!=8");
        return;
    }
    if (self->_order != 1) {
        O2PDFError(__FILE__, __LINE__, @"Type0 can not handle order!=1");
        return;
    }
    // FIXME, scale input to domain, more bounds checking
    int i, numberOfOutputs = self->_rangeCount / 2;

    int inputIndex = MIN(MAX(0, input[0] * (self->_size[0] - 1)),
                         self->_size[self->_sizeCount - 1]);
    int bytesPerSample = self->_bitsPerSample / 8;
    int sampleOffset = inputIndex * (bytesPerSample * numberOfOutputs);

    const uint8_t *samples = self->_bytes + sampleOffset;

    for (i = 0; i < numberOfOutputs; i++) {
        output[i] = samples[i];
        output[i] = output[i] / 255.0;
    }
}

- initWithDomain: (O2PDFArray *) domain
                range: (O2PDFArray *) range
                 size: (O2PDFArray *) size
        bitsPerSample: (O2PDFInteger) bps
                order: (O2PDFInteger) order
               encode: (O2PDFArray *) encode
               decode: (O2PDFArray *) decode
                 data: (NSData *) data
{
    if ([super initWithDomain: domain range: range] == nil)
        return nil;

    _info = self;
    _callbacks.evaluate = evaluate;

    _sizeCount = 0;
    [size getIntegers: &_size count: &_sizeCount];
    _bitsPerSample = bps;
    _order = order;
    [encode getNumbers: &_encode count: &_encodeCount];
    [decode getNumbers: &_decode count: &_decodeCount];
    _data = [data retain];
    _dataLength = [data length];
    _bytes = [data bytes];

    return self;
}

- (void) dealloc {
    if (_size != NULL)
        NSZoneFree(NULL, _size);
    if (_encode != NULL)
        NSZoneFree(NULL, _encode);
    if (_decode != NULL)
        NSZoneFree(NULL, _decode);
    [_data release];
    [super dealloc];
}

- (BOOL) isLinear {
    return NO;
}

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

    [result setIntegerForKey: "FunctionType" value: 4];
    [result setObjectForKey: "Domain"
                      value: [O2PDFArray pdfArrayWithNumbers: _domain
                                                       count: _domainCount]];
    [result setObjectForKey: "Range"
                      value: [O2PDFArray pdfArrayWithNumbers: _range
                                                       count: _rangeCount]];
    // FIXME  stream

    return [context encodeIndirectPDFObject: result];
}

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

    return result;
}

@end