Recent changes to feature-requests

#11 Support for Patterns

kalyan — Wed, 21 Oct 2020 05:55:44 -0000

Does libharu pdf library is able to produce graphs?

Support for Patterns

Anonymous — Thu, 22 Feb 2007 13:13:03 -0000

Is there any plan to support for Patterns?

Can you add UNICODE support in libharu2?

Anonymous — Tue, 30 Jan 2007 10:28:19 -0000

Can you add UNICODE support in libharu2?

Can you add PDF parsing support?

Anonymous — Sun, 03 Dec 2006 15:42:40 -0000

Can you add PDF parsing support?

HPDF_Load...FromMem should be exported

Aleksey Prudkiy — Tue, 28 Nov 2006 13:43:43 -0000

Will be good to have mem versions of next functions:
HPDF_LoadTTFontFromFile
HPDF_LoadPngImageFromFile
HPDF_LoadJpegImageFromFile

i.e.
HPDF_LoadTTFontFromMem
HPDF_LoadPngImageFromMem
HPDF_LoadJpegImageFromMem

to avoid needs in temporary files.

Support for JBIG files please

Ade — Mon, 06 Nov 2006 23:55:58 -0000

Hi,

Later versions of the PDF spec support additional
image types.

It would be very useful if you could add in support
for the JBIG file format which is supported in v1.4

Best regards,
Adrian Nelson

A Couple Of changes - Pixels per Metre

LeslieM — Tue, 18 Jul 2006 12:45:49 -0000

Here are a couple of changes I have made to my (old)
copy of libharu.

1. Provide the ability to set the Creation Date
Property.

2. Provide the ability to determine the Pixels Per
Metre for PNG images.
This important change allows us to scale the image
correctly so that it not only appears correctly on the
screen, but importantly when printing out the PDF file
the image retains its original size.

// Liharuc.h

The following definitions have been added.....

/*-----------------------------------------------------
----------------------*/
/*----- PdfInfo class ---------------------------------
----------------------*/

int pdf_info_set_creation_date(pdf_info info, pdf_date
date);

/*-----------------------------------------------------
-----------------------*/
/*----- PdfImage class --------------------------------
-----------------------*/

unsigned int pdf_image_get_pixels_per_meter(pdf_image
image);

//Libharu.h

/*-----------------------------------------------------
-----------------------*/
/*----- PdfImage class --------------------------------
-----------------------*/

The following elements were added to the class - no
other changes here.

class PdfImage : public PdfXObject
{
public:
unsigned int PixelsPerMeter() { return
fPixelsPerMeter; }
protected:
unsigned int fPixelsPerMeter;

};

//Libharuc.cc

The following C interface functions were added.

/*-----------------------------------------------------
----------------------*/
/*----- pdf_info --------------------------------------
----------------------*/

int pdf_info_set_creation_date(pdf_info info, pdf_date
date)
{
PDF_INFO_SAFE_CALL(info, SetCreationDate, (date));
}

/*-----------------------------------------------------
----------------------*/
/*----- pdf_image -------------------------------------
----------------------*/

unsigned int pdf_image_get_pixels_per_meter(pdf_image
image)
{
if (image == NULL)
return 0;

PdfImage* image_obj = (PdfImage*)image;
return image_obj->PixelsPerMeter();
}

// PdfPngImage.cc

/*-----------------------------------------------------
-----------------------*/
/*----- PdfPngImage class -----------------------------
-----------------------*/

The following element was added......

PdfPngImage::PdfPngImage(PdfDoc* doc)
: PdfImage(doc)
{

fPixelsPerMeter = 0;
}

The following changes were made to this function....

void
PdfPngImage::LoadFromFile(const char* filename)
{
.
.
.

FILE* infile = NULL;

// This variable was added directly after the infile
declaration.

png_uint_32 ppm = 0;

.
.
.
.
.
.

try {

/* io setting */
infile = OpenImageFile(filename);
.
.
.
.
.
.

png_uint_32 len = png_get_rowbytes(png_ptr,
info_ptr);

// **** This next line ONLY was added directly after
ther above line. *****

ppm = png_get_pixels_per_meter(png_ptr, info_ptr);

.
.
.
.
.
.

}

/* setting the info of the image. */
fWidth = (unsigned int)info_ptr->width;
fHeight = (unsigned int)info_ptr->height;
fBitsPerComponent = (unsigned int)info_ptr-
>bit_depth;

// **** This next line ONLY was added directly after
the above line. *****

fPixelsPerMeter = (unsigned int)ppm;

.
.
.
.
.
.

fHasImage = true;
return;
}

Page resolution

d4rk — Wed, 02 Nov 2005 23:57:02 -0000

First of all, the library is excellent.

Would it be possible to add an option to set page
resolution in addition to the page size? For example,
if I am inserting a high resolution image (say from a
scanner that scanned at 300dpi),then the image size
would be pretty high, but I would still like the image
to be displayed in a 8.5x11in document, so if the page
resolution is increased to 300dpi, then the image will
display correctly.

Thanks and again, keep up the excellent work!

Cheers!

Linearization

Ade — Sat, 08 Oct 2005 08:43:13 -0000

Linearization (Fast Web View) would be very useful. It is
part of the v1.2 PDF specification - and is the ability to
be able to view the first pages of a multi-page PDF
document without having to wait for the whole document
to be downloaded.

Linearization organises the pdf so that the content of
every page is optimised and all data for that page is
located nearby (more information can be found in the
latest - and earlier I would have thought - Adobe PDF
Reference 1.5, Appendix F Linearized PDF).

Best regards
Adrian Nelson

Can you add CCITT and J2K Support?

Anonymous — Tue, 30 Nov 2004 06:33:06 -0000

Can you add CCITT and J2K support?