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 
33 cairo_status_t
helper_cairo_surface_write_to_ansi_stream(cairo_surface_t * surface,cairo_write_func_t write_func,void * closure)34 helper_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 = data ? * (uint32_t *) data : 0;
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