tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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hb-gdi.cc (2534B)

      1 /*
      2 * Copyright © 2019  Ebrahim Byagowi
      3 *
      4 *  This is part of HarfBuzz, a text shaping library.
      5 *
      6 * Permission is hereby granted, without written agreement and without
      7 * license or royalty fees, to use, copy, modify, and distribute this
      8 * software and its documentation for any purpose, provided that the
      9 * above copyright notice and the following two paragraphs appear in
     10 * all copies of this software.
     11 *
     12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
     13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
     14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
     15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
     16 * DAMAGE.
     17 *
     18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
     19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
     20 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
     21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
     22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
     23 */
     24 
     25 #include "hb.hh"
     26 
     27 #ifdef HAVE_GDI
     28 
     29 #include "hb-gdi.h"
     30 
     31 
     32 /**
     33 * SECTION:hb-gdi
     34 * @title: hb-gdi
     35 * @short_description: GDI integration
     36 * @include: hb-gdi.h
     37 *
     38 * Functions for using HarfBuzz with GDI fonts.
     39 **/
     40 
     41 static hb_blob_t *
     42 _hb_gdi_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
     43 {
     44  char *buffer = nullptr;
     45  DWORD length = 0;
     46 
     47  HDC hdc = GetDC (nullptr);
     48  if (unlikely (!SelectObject (hdc, (HFONT) user_data))) goto fail;
     49 
     50  length = GetFontData (hdc, hb_uint32_swap (tag), 0, buffer, length);
     51  if (unlikely (length == GDI_ERROR)) goto fail_with_releasedc;
     52 
     53  buffer = (char *) hb_malloc (length);
     54  if (unlikely (!buffer)) goto fail_with_releasedc;
     55  length = GetFontData (hdc, hb_uint32_swap (tag), 0, buffer, length);
     56  if (unlikely (length == GDI_ERROR)) goto fail_with_releasedc_and_free;
     57  ReleaseDC (nullptr, hdc);
     58 
     59  return hb_blob_create ((const char *) buffer, length, HB_MEMORY_MODE_WRITABLE, buffer, hb_free);
     60 
     61 fail_with_releasedc_and_free:
     62  hb_free (buffer);
     63 fail_with_releasedc:
     64  ReleaseDC (nullptr, hdc);
     65 fail:
     66  return hb_blob_get_empty ();
     67 }
     68 
     69 /**
     70 * hb_gdi_face_create:
     71 * @hfont: a HFONT object.
     72 *
     73 * Constructs a new face object from the specified GDI HFONT.
     74 *
     75 * Return value: #hb_face_t object corresponding to the given input
     76 *
     77 * Since: 2.6.0
     78 **/
     79 hb_face_t *
     80 hb_gdi_face_create (HFONT hfont)
     81 {
     82  return hb_face_create_for_tables (_hb_gdi_reference_table, (void *) hfont, nullptr);
     83 }
     84 
     85 #endif