1 /*
2 * Copyright (C) 2007 Kevin Ollivier <kevino@theolliviers.com>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27
28 #include <wx/defs.h>
29 #include <wx/gdicmn.h>
30 #include <wx/font.h>
31 #include <wx/fontutil.h>
32 #include "fontprops.h"
33 #include "non-kerned-drawing.h"
34
35 #include <gdk/gdk.h>
36
37 #include <cairo.h>
38 #include <pango/pango.h>
39 #include <pango/pangocairo.h>
40
wxFontProperties(wxFont * font)41 wxFontProperties::wxFontProperties(wxFont* font):
42 m_ascent(0), m_descent(0), m_lineGap(0), m_lineSpacing(0), m_xHeight(0)
43 {
44 ASSERT(font && font->Ok());
45
46 #if USE(WXGC)
47 cairo_font_extents_t font_extents;
48 cairo_text_extents_t text_extents;
49 cairo_scaled_font_t* scaled_font = WebCore::createScaledFontForFont(font);
50
51 cairo_scaled_font_extents(scaled_font, &font_extents);
52 m_ascent = static_cast<int>(font_extents.ascent);
53 m_descent = static_cast<int>(font_extents.descent);
54 m_lineSpacing = static_cast<int>(font_extents.height);
55 cairo_scaled_font_text_extents(scaled_font, "x", &text_extents);
56 m_xHeight = text_extents.height;
57 cairo_scaled_font_text_extents(scaled_font, " ", &text_extents);
58 m_lineGap = m_lineSpacing - m_ascent - m_descent;
59
60 cairo_scaled_font_destroy(scaled_font);
61 #else
62 PangoContext* context = gdk_pango_context_get_for_screen( gdk_screen_get_default() );
63 PangoLayout* layout = pango_layout_new(context);
64 // and use it if it's valid
65 if ( font && font->Ok() )
66 {
67 pango_layout_set_font_description
68 (
69 layout,
70 font->GetNativeFontInfo()->description
71 );
72 }
73
74 PangoFontMetrics* metrics = pango_context_get_metrics (context, font->GetNativeFontInfo()->description, NULL);
75
76 int height = font->GetPixelSize().GetHeight();
77
78 m_ascent = PANGO_PIXELS(pango_font_metrics_get_ascent(metrics));
79 m_descent = PANGO_PIXELS(pango_font_metrics_get_descent(metrics));
80
81 int h;
82
83 const char* x = "x";
84 pango_layout_set_text( layout, x, strlen(x) );
85 pango_layout_get_pixel_size( layout, NULL, &h );
86
87 m_xHeight = h;
88 m_lineGap = (m_ascent + m_descent) / 4; // FIXME: How can we calculate this via Pango?
89 m_lineSpacing = m_ascent + m_descent;
90
91 pango_font_metrics_unref(metrics);
92 #endif
93 }
94
GetTextExtent(const wxFont & font,const wxString & str,wxCoord * width,wxCoord * height,wxCoord * descent,wxCoord * externalLeading)95 void GetTextExtent( const wxFont& font, const wxString& str, wxCoord *width, wxCoord *height,
96 wxCoord *descent, wxCoord *externalLeading )
97 {
98 if ( width )
99 *width = 0;
100 if ( height )
101 *height = 0;
102 if ( descent )
103 *descent = 0;
104 if ( externalLeading )
105 *externalLeading = 0;
106
107 if (str.empty())
108 return;
109
110 // FIXME: Doesn't support height, descent or external leading, though we don't need this for WebKit
111 // it will need to be implemented before merging into wx unless we craft a new API.
112 #if USE(WXGC)
113 PangoFont* pangoFont = WebCore::createPangoFontForFont(&font);
114 PangoContext* pangoContext = pango_cairo_font_map_create_context(PANGO_CAIRO_FONT_MAP(WebCore::pangoFontMap()));
115 PangoGlyph pangoGlyph = WebCore::pango_font_get_glyph(pangoFont, pangoContext, (gunichar)g_utf8_get_char(str.ToUTF8()));
116 cairo_glyph_t cglyph = { pangoGlyph, 0, 0 };
117 cairo_text_extents_t extents;
118 cairo_scaled_font_t* scaled_font = WebCore::createScaledFontForFont(&font);
119 cairo_scaled_font_glyph_extents(scaled_font, &cglyph, 1, &extents);
120
121 if (cairo_scaled_font_status(scaled_font) == CAIRO_STATUS_SUCCESS && extents.x_advance != 0)
122 *width = (wxCoord)extents.x_advance;
123
124 cairo_scaled_font_destroy(scaled_font);
125 g_object_unref(pangoContext);
126 g_object_unref(pangoFont);
127 #else
128 PangoContext* context = gdk_pango_context_get_for_screen( gdk_screen_get_default() );
129 PangoLayout* m_layout = pango_layout_new(context);
130 // and use it if it's valid
131 if ( font && font->IsOk() )
132 {
133 pango_layout_set_font_description
134 (
135 m_layout,
136 font->GetNativeFontInfo()->description
137 );
138 }
139
140 // Set layout's text
141 const wxCharBuffer dataUTF8 = wxConvUTF8.cWX2MB(str);
142 if ( !dataUTF8 )
143 {
144 // hardly ideal, but what else can we do if conversion failed?
145 return;
146 }
147
148 pango_layout_set_text( m_layout, dataUTF8, strlen(dataUTF8) );
149
150 int h = 0;
151 pango_layout_get_pixel_size( m_layout, width, &h );
152
153 if (descent)
154 {
155 PangoLayoutIter *iter = pango_layout_get_iter(m_layout);
156 int baseline = pango_layout_iter_get_baseline(iter);
157 pango_layout_iter_free(iter);
158 *descent = h - PANGO_PIXELS(baseline);
159 }
160
161 if (height)
162 *height = (wxCoord) h;
163 #endif
164 }
165
166