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/*
Rdmtx - Ruby wrapper for libdmtx
Copyright (C) 2008 Romain Goyet
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Contact: r.goyet@gmail.com
*/
/* $Id:$ */
#include <ruby.h>
#include <dmtx.h>
static VALUE rdmtx_init(VALUE self) {
return self;
}
static VALUE rdmtx_decode(VALUE self, VALUE image /* Image from RMagick (Magick::Image) */, VALUE timeout /* Timeout in msec */) {
VALUE rawImageString = rb_funcall(image, rb_intern("export_pixels_to_str"), 0);
VALUE safeImageString = StringValue(rawImageString);
char * imageBuffer = RSTRING(safeImageString)->ptr;
int width = NUM2INT(rb_funcall(image, rb_intern("columns"), 0));
int height = NUM2INT(rb_funcall(image, rb_intern("rows"), 0));
DmtxImage *dmtxImage = dmtxImageCreate((unsigned char *)imageBuffer, width,
height, DmtxPack24bppRGB);
VALUE results = rb_ary_new();
/* Initialize decode struct for newly loaded image */
DmtxDecode * decode = dmtxDecodeCreate(dmtxImage, 1);
DmtxRegion * region;
int intTimeout = NUM2INT(timeout);
DmtxTime dmtxTimeout = dmtxTimeAdd(dmtxTimeNow(), intTimeout);
for(;;) {
if (intTimeout == 0) {
region = dmtxRegionFindNext(decode, NULL);
} else {
region = dmtxRegionFindNext(decode, &dmtxTimeout);
}
if (region == NULL )
break;
DmtxMessage * message = dmtxDecodeMatrixRegion(decode, region, DmtxUndefined);
if (message != NULL) {
VALUE outputString = rb_str_new2((char *)message->output);
rb_ary_push(results, outputString);
dmtxMessageDestroy(&message);
}
dmtxRegionDestroy(®ion);
}
dmtxDecodeDestroy(&decode);
dmtxImageDestroy(&dmtxImage);
return results;
}
static VALUE rdmtx_encode(VALUE self, VALUE string) {
/* Create and initialize libdmtx structures */
DmtxEncode * enc = dmtxEncodeCreate();
VALUE safeString = StringValue(string);
dmtxEncodeSetProp(enc, DmtxPropPixelPacking, DmtxPack24bppRGB);
dmtxEncodeSetProp(enc, DmtxPropSizeRequest, DmtxSymbolSquareAuto);
/* Create barcode image */
if (dmtxEncodeDataMatrix(enc, RSTRING(safeString)->len,
(unsigned char *)RSTRING(safeString)->ptr) == DmtxFail) {
// printf("Fatal error !\n");
dmtxEncodeDestroy(&enc);
return Qnil;
}
int width = dmtxImageGetProp(enc->image, DmtxPropWidth);
int height = dmtxImageGetProp(enc->image, DmtxPropHeight);
VALUE magickImageClass = rb_path2class("Magick::Image");
VALUE outputImage = rb_funcall(magickImageClass, rb_intern("new"), 2, INT2NUM(width), INT2NUM(height));
rb_funcall(outputImage, rb_intern("import_pixels"), 7,
INT2NUM(0),
INT2NUM(0),
INT2NUM(width),
INT2NUM(height),
rb_str_new("RGB", 3),
rb_str_new((char *)enc->image->pxl, 3*width*height),
// rb_const_get("Magick" ,rb_intern("CharPixel"))
rb_eval_string("Magick::CharPixel"));
/* Clean up */
dmtxEncodeDestroy(&enc);
return outputImage;
}
VALUE cRdmtx;
void Init_Rdmtx() {
cRdmtx = rb_define_class("Rdmtx", rb_cObject);
rb_define_method(cRdmtx, "initialize", rdmtx_init, 0);
rb_define_method(cRdmtx, "decode", rdmtx_decode, 2);
rb_define_method(cRdmtx, "encode", rdmtx_encode, 1);
}
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