Revision e18ea70ff4b42f09d32d4b1c4c3a61434adc6222 authored by Tobias Ellinghaus on 01 December 2015, 11:58:16 UTC, committed by Tobias Ellinghaus on 01 December 2015, 11:58:16 UTC
1 parent b05fa3c
pdf.h
/*
* This file is part of darktable,
* copyright (c) 2015 tobias ellinghaus.
*
* darktable is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* darktable 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with darktable. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* this is a simple PDF writer, capable of creating multi page PDFs with embedded images.
* it is NOT meant to be a full fledged PDF library, and shall never turn into something like that!
* see the main() fucntion in pdf.c to see an example how to use this.
*/
#include <inttypes.h>
#include <glib.h>
#include <glib/gi18n.h>
// clang-format off
#define dt_pdf_inch_to_point(inch) ((inch) * 72.0)
#define dt_pdf_point_to_inch(pt) ((pt) / 72.0)
#define dt_pdf_mm_to_point(mm) dt_pdf_inch_to_point((mm) / 25.4)
#define dt_pdf_point_to_mm(pt) dt_pdf_point_to_inch((pt) * 25.4)
#define dt_pdf_point_to_pixel(pt, dpi) (dt_pdf_point_to_inch(pt) * (dpi))
#define dt_pdf_pixel_to_point(px, dpi) (dt_pdf_inch_to_point((px) / (dpi)))
typedef enum dt_pdf_stream_encoder_t
{
DT_PDF_STREAM_ENCODER_ASCII_HEX = 0, // inflate size by 2 -- big & fast
DT_PDF_STREAM_ENCODER_FLATE = 1 // use zlib to compress -- small & slow
} dt_pdf_stream_encoder_t;
typedef struct dt_pdf_t
{
FILE *fd;
int next_id;
int next_image;
size_t bytes_written;
float page_width, page_height, dpi;
dt_pdf_stream_encoder_t default_encoder;
char *title;
size_t *offsets;
int n_offsets;
} dt_pdf_t;
typedef struct dt_pdf_image_t
{
int object_id;
int name_id;
size_t size;
size_t width, height;
float bb_x, bb_y, bb_width, bb_height;
gboolean rotate_to_fit;
gboolean outline_mode; // set to 1 to only draw a box instead of the image
gboolean show_bb; // set to 1 to draw the bounding box. useful for debugging
} dt_pdf_image_t;
typedef struct dt_pdf_page_t
{
int object_id;
size_t size;
} dt_pdf_page_t;
static const struct
{
char *name;
float factor;
} dt_pdf_units[] =
{
{N_("mm"), dt_pdf_mm_to_point(1.0)},
{N_("cm"), dt_pdf_mm_to_point(10.0)},
{N_("inch"), dt_pdf_inch_to_point(1.0)},
{N_("\""), dt_pdf_inch_to_point(1.0)},
{NULL, 0.0}
};
static const int dt_pdf_units_n = sizeof(dt_pdf_units) / sizeof(dt_pdf_units[0]);
static const struct
{
char *name;
float width;
float height;
} dt_pdf_paper_sizes[] =
{
{N_("a4"), dt_pdf_mm_to_point(210), dt_pdf_mm_to_point(297)},
{N_("a3"), dt_pdf_mm_to_point(297), dt_pdf_mm_to_point(420)},
{N_("letter"), dt_pdf_inch_to_point(8.5), dt_pdf_inch_to_point(11.0)},
{N_("legal"), dt_pdf_inch_to_point(8.5), dt_pdf_inch_to_point(14.0)},
{NULL, 0.0, 0.0}
};
// clang-format on
static const int dt_pdf_paper_sizes_n = sizeof(dt_pdf_paper_sizes) / sizeof(dt_pdf_paper_sizes[0]);
// construction of the pdf
dt_pdf_t *dt_pdf_start(const char *filename, float width, float height, float dpi, dt_pdf_stream_encoder_t default_encoder);
int dt_pdf_add_icc(dt_pdf_t *pdf, const char *filename);
int dt_pdf_add_icc_from_data(dt_pdf_t *pdf, const unsigned char *data, size_t size);
dt_pdf_image_t *dt_pdf_add_image(dt_pdf_t *pdf, const unsigned char *image, int bpp, int width, int height, int icc_id, float border);
dt_pdf_page_t *dt_pdf_add_page(dt_pdf_t *pdf, dt_pdf_image_t **images, int n_images);
void dt_pdf_finish(dt_pdf_t *pdf, dt_pdf_page_t **pages, int n_pages);
// general helpers
int dt_pdf_parse_length(const char *str, float *length);
int dt_pdf_parse_paper_size(const char *str, float *width, float *height);
// modelines: These editor modelines have been set for all relevant files by tools/update_modelines.sh
// vim: shiftwidth=2 expandtab tabstop=2 cindent
// kate: tab-indents: off; indent-width 2; replace-tabs on; indent-mode cstyle; remove-trailing-space on;
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