kc3-lang/kc3/pdf/pdf_write_page.c

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• Hash : 76e50487
  Author : Thomas de Grivel
  Date : 2025-12-08T16:08:52
  

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• pdf/pdf_write_page.c

• /* kc3
   * Copyright from 2022 to 2025 kmx.io <contact@kmx.io>
   *
   * Permission is hereby granted to use this software granted the above
   * copyright notice and this permission paragraph are included in all
   * copies and substantial portions of this software.
   *
   * THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
   * PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
   * AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
   * THIS SOFTWARE.
   */
  #include "../libkc3/kc3.h"
  #include "pdf.h"
  #include "pdf_buf_write.h"
  #include "pdf_stream.h"
  #include "pdf_write.h"
  #include "pdf_write_page.h"
  
  void kc3_pdf_write_page_delete (s_pdf_write_page **page)
  {
    assert(page);
    assert(*page);
    pdf_write_page_clean(*page);
    free(*page);
  }
  
  s_pdf_write_page ** kc3_pdf_write_page_new (s_pdf_write_page **page,
                                              s_pdf_write **pdf,
                                              s_pdf_rect *box)
  {
    s_pdf_write_page *tmp;
    if (! (tmp = alloc(sizeof(s_pdf_write_page))))
      return NULL;
    if (! pdf_write_page_init(tmp, *pdf, box)) {
      free(tmp);
      return NULL;
    }
    *page = tmp;
    return page;
  }
  
  s_pdf_write_page ** kc3_pdf_write_page_image (s_pdf_write_page **page,
                                                f32 x, f32 y, u32 image)
  {
    s_buf *buf;
    assert(page);
    assert(*page);
    buf = (*page)->contents.stream.stream.buf;
    assert(buf);
    buf_write_1(buf, "q\n");
    pdf_buf_write_float(buf, x);
    buf_write_1(buf, " 0 0 ");
    pdf_buf_write_float(buf, y);
    buf_write_1(buf, " ");
    pdf_buf_write_float(buf, x);
    buf_write_1(buf, " ");
    pdf_buf_write_float(buf, y);
    buf_write_1(buf, " cm\n");
    buf_write_1(buf, "/Im");
    buf_inspect_u32(buf, image);
    buf_write_1(buf, " Do\n");
    buf_write_1(buf, "Q\n");
    return page;
  }
  
  s_pdf_write_page ** kc3_pdf_write_page_rectangle (s_pdf_write_page **page,
                                                    s_pdf_rect *rect)
  {
    s_buf *buf;
    assert(page);
    assert(*page);
    assert(rect);
    buf = (*page)->contents.stream.stream.buf;
    assert(buf);
    pdf_buf_write_float(buf, rect->x);
    buf_write_1(buf, " ");
    pdf_buf_write_float(buf, rect->y);
    buf_write_1(buf, " ");
    pdf_buf_write_float(buf, rect->w);
    buf_write_1(buf, " ");
    pdf_buf_write_float(buf, rect->h);
    buf_write_1(buf, " re\n");
    buf_write_1(buf, "S\n");
    return page;
  }
  
  s_pdf_write_page **
  kc3_pdf_write_page_set_color_rgb (s_pdf_write_page **page, f32 r, f32 g,
                                    f32 b)
  {
    s_buf *buf;
    assert(page);
    assert(*page);
    buf = (*page)->contents.stream.stream.buf;
    assert(buf);
    pdf_buf_write_float(buf, r);
    buf_write_1(buf, " ");
    pdf_buf_write_float(buf, g);
    buf_write_1(buf, " ");
    pdf_buf_write_float(buf, b);
    buf_write_1(buf, " rg\n");
    return page;
  }
  
  s_pdf_write_page ** kc3_pdf_write_page_text (s_pdf_write_page **page,
                                               f32 x, f32 y, u32 font,
                                               f32 font_size, s_str *text)
  {
    s_buf *buf;
    assert(page);
    assert(*page);
    assert(text);
    buf = (*page)->contents.stream.stream.buf;
    assert(buf);
    buf_write_1(buf, "BT\n");
    buf_write_1(buf, "/F");
    buf_inspect_u32_decimal(buf, font);
    buf_write_1(buf, " ");
    pdf_buf_write_float(buf, font_size);
    buf_write_1(buf, " Tf\n");
    pdf_buf_write_float(buf, x);
    buf_write_1(buf, " ");
    pdf_buf_write_float(buf, y);
    buf_write_1(buf, " Td\n");
    pdf_buf_write_string_hex(buf, text);
    buf_write_1(buf, " Tj\n");
    buf_write_1(buf, "ET\n");
    return page;
  }
  
  void pdf_write_page_clean (s_pdf_write_page *page)
  {
    assert(page);
    pdf_stream_clean(&page->contents.stream.stream);
    map_clean(&page->map);
  }
  
  s_pdf_write_page * pdf_write_page_init (s_pdf_write_page *page,
                                          s_pdf_write *pdf,
                                          s_pdf_rect *box)
  {
    u32 content_stream_object_number;
    s_pdf_write_page tmp = {0};
    if (! map_init(&tmp.map, 5))
      return NULL;
    tmp.object_number = pdf_write_object_number_register(pdf);
    content_stream_object_number = pdf_write_object_number_register(pdf);
    tmp.contents.stream.object_number = content_stream_object_number;
    if (! pdf_stream_init(&tmp.contents.stream.stream)) {
      map_clean(&tmp.map);
      return NULL;
    }
    tag_init_psym(tmp.map.key,   sym_1("Type"));
    tag_init_psym(tmp.map.value, sym_1("Page"));
    tag_init_psym(tmp.map.key       + 1, sym_1("Parent"));
    pdf_tag_init_xref(tmp.map.value + 1, PDF_OBJECT_NUMBER_PAGES, 0);
    tag_init_psym(tmp.map.key       + 2, sym_1("Resources"));
    pdf_tag_init_xref(tmp.map.value + 2, PDF_OBJECT_NUMBER_RESOURCES, 0);
    tag_init_psym(tmp.map.key                + 3, sym_1("MediaBox"));
    tag_init_pstruct_copy_data(tmp.map.value + 3, sym_1("PDF.Rect"), box);
    tag_init_psym(tmp.map.key       + 4, sym_1("Contents"));
    pdf_tag_init_xref(tmp.map.value + 4, content_stream_object_number, 0);
    *page = tmp;
    return page;
  }
  

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