helper-cairo-ansi.cc revision c77d1ade6898cea161f0709c5c5a912e14aff951 
1/*
2 * Copyright © 2012  Google, Inc.
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 * Google Author(s): Behdad Esfahbod
25 */
26
27#include "helper-cairo-ansi.hh"
28#include "options.hh"
29
30#include "ansi-print.hh"
31
32
33cairo_status_t
34helper_cairo_surface_write_to_ansi_stream (cairo_surface_t	*surface,
35					   cairo_write_func_t	write_func,
36					   void			*closure)
37{
38  unsigned int width = cairo_image_surface_get_width (surface);
39  unsigned int height = cairo_image_surface_get_height (surface);
40  if (cairo_image_surface_get_format (surface) != CAIRO_FORMAT_RGB24) {
41    cairo_surface_t *new_surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, width, height);
42    cairo_t *cr = cairo_create (new_surface);
43    if (cairo_image_surface_get_format (surface) == CAIRO_FORMAT_A8) {
44      cairo_set_source_rgb (cr, 0., 0., 0.);
45      cairo_paint (cr);
46      cairo_set_source_rgb (cr, 1., 1., 1.);
47      cairo_mask_surface (cr, surface, 0, 0);
48    } else {
49      cairo_set_source_rgb (cr, 1., 1., 1.);
50      cairo_paint (cr);
51      cairo_set_source_surface (cr, surface, 0, 0);
52      cairo_paint (cr);
53    }
54    cairo_destroy (cr);
55    surface = new_surface;
56  } else
57    cairo_surface_reference (surface);
58
59  unsigned int stride = cairo_image_surface_get_stride (surface);
60  const uint32_t *data = (uint32_t *) (void *) cairo_image_surface_get_data (surface);
61
62  /* We don't have rows to spare on the terminal window...
63   * Find the tight image top/bottom and only print in between. */
64
65  /* Use corner color as background color. */
66  uint32_t bg_color = * (uint32_t *) data;
67
68  /* Drop first row while empty */
69  while (height)
70  {
71    unsigned int i;
72    for (i = 0; i < width; i++)
73      if (data[i] != bg_color)
74        break;
75    if (i < width)
76      break;
77    data += stride / 4;
78    height--;
79  }
80
81  /* Drop last row while empty */
82  unsigned int orig_height = height;
83  while (height)
84  {
85    const uint32_t *row = data + (height - 1) * stride / 4;
86    unsigned int i;
87    for (i = 0; i < width; i++)
88      if (row[i] != bg_color)
89        break;
90    if (i < width)
91      break;
92    height--;
93  }
94  if (height < orig_height)
95    height++; /* Add one last blank row for padding. */
96
97  if (width && height)
98    ansi_print_image_rgb24 (data, width, height, stride / 4);
99
100  cairo_surface_destroy (surface);
101  return CAIRO_STATUS_SUCCESS;
102}
103