mirror of
https://github.com/pocoproject/poco.git
synced 2025-11-24 14:20:10 +01:00
138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/*
|
|
* << Haru Free PDF Library 2.0.3 >> -- hpdf_doc_png.c
|
|
*
|
|
* Copyright (c) 1999-2006 Takeshi Kanno <takeshi_kanno@est.hi-ho.ne.jp>
|
|
*
|
|
* Permission to use, copy, modify, distribute and sell this software
|
|
* and its documentation for any purpose is hereby granted without fee,
|
|
* provided that the above copyright notice appear in all copies and
|
|
* that both that copyright notice and this permission notice appear
|
|
* in supporting documentation.
|
|
* It is provided "as is" without express or implied warranty.
|
|
*
|
|
*/
|
|
|
|
|
|
#include "hpdf_conf.h"
|
|
#include "hpdf_utils.h"
|
|
#include "hpdf.h"
|
|
#include "hpdf_image.h"
|
|
|
|
|
|
static HPDF_Image
|
|
LoadPngImageFromStream (HPDF_Doc pdf,
|
|
HPDF_Stream imagedata,
|
|
HPDF_BOOL delayed_loading);
|
|
|
|
|
|
HPDF_EXPORT(HPDF_Image)
|
|
HPDF_LoadPngImageFromFile (HPDF_Doc pdf,
|
|
const char *filename)
|
|
{
|
|
HPDF_Stream imagedata;
|
|
HPDF_Image image;
|
|
|
|
HPDF_PTRACE ((" HPDF_LoadPngImageFromFile\n"));
|
|
|
|
if (!HPDF_HasDoc (pdf))
|
|
return NULL;
|
|
|
|
/* create file stream */
|
|
imagedata = HPDF_FileReader_New (pdf->mmgr, filename);
|
|
|
|
if (HPDF_Stream_Validate (imagedata))
|
|
image = LoadPngImageFromStream (pdf, imagedata, HPDF_FALSE);
|
|
else
|
|
image = NULL;
|
|
|
|
/* destroy file stream */
|
|
if (imagedata)
|
|
HPDF_Stream_Free (imagedata);
|
|
|
|
if (!image)
|
|
HPDF_CheckError (&pdf->error);
|
|
|
|
return image;
|
|
}
|
|
|
|
/* delaied loading version of HPDF_LoadPngImageFromFile */
|
|
HPDF_EXPORT(HPDF_Image)
|
|
HPDF_LoadPngImageFromFile2 (HPDF_Doc pdf,
|
|
const char *filename)
|
|
{
|
|
HPDF_Stream imagedata;
|
|
HPDF_Image image;
|
|
HPDF_String fname;
|
|
|
|
HPDF_PTRACE ((" HPDF_LoadPngImageFromFile\n"));
|
|
|
|
if (!HPDF_HasDoc (pdf))
|
|
return NULL;
|
|
|
|
/* check whether file name is valid or not. */
|
|
imagedata = HPDF_FileReader_New (pdf->mmgr, filename);
|
|
|
|
if (HPDF_Stream_Validate (imagedata))
|
|
image = LoadPngImageFromStream (pdf, imagedata, HPDF_TRUE);
|
|
else
|
|
image = NULL;
|
|
|
|
/* destroy file stream */
|
|
if (imagedata)
|
|
HPDF_Stream_Free (imagedata);
|
|
|
|
if (!image)
|
|
HPDF_CheckError (&pdf->error);
|
|
|
|
/* add file-name to image dictionary as a hidden entry.
|
|
* it is used when the image data is needed.
|
|
*/
|
|
fname = HPDF_String_New (pdf->mmgr, filename, NULL);
|
|
if (!fname) {
|
|
HPDF_CheckError (&pdf->error);
|
|
return NULL;
|
|
}
|
|
|
|
fname->header.obj_id |= HPDF_OTYPE_HIDDEN;
|
|
|
|
if ((HPDF_Dict_Add (image, "_FILE_NAME", fname)) != HPDF_OK) {
|
|
HPDF_CheckError (&pdf->error);
|
|
return NULL;
|
|
}
|
|
|
|
return image;
|
|
}
|
|
|
|
#ifndef HPDF_NOPNGLIB
|
|
static HPDF_Image
|
|
LoadPngImageFromStream (HPDF_Doc pdf,
|
|
HPDF_Stream imagedata,
|
|
HPDF_BOOL delayed_loading)
|
|
{
|
|
HPDF_Image image;
|
|
|
|
HPDF_PTRACE ((" HPDF_LoadPngImageFromStream\n"));
|
|
|
|
image = HPDF_Image_LoadPngImage (pdf->mmgr, imagedata, pdf->xref,
|
|
delayed_loading);
|
|
|
|
if (image && (pdf->compression_mode & HPDF_COMP_IMAGE))
|
|
image->filter = HPDF_STREAM_FILTER_FLATE_DECODE;
|
|
|
|
return image;
|
|
}
|
|
|
|
#else
|
|
static HPDF_Image
|
|
LoadPngImageFromStream (HPDF_Doc pdf,
|
|
HPDF_Stream imagedata,
|
|
HPDF_BOOL delayed_loading)
|
|
{
|
|
HPDF_SetError (&pdf->error, HPDF_UNSUPPORTED_FUNC, 0);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
#endif /* HPDF_NOPNGLIB */
|
|
|