2 Copyright (C) 2001-2006, William Joseph.
5 This file is part of GtkRadiant.
7 GtkRadiant is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 GtkRadiant is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GtkRadiant; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "globaldefs.h"
26 // generic string printing with call lists
27 class GLFontCallList : public GLFont {
33 GLFontCallList(GLuint displayList, int asc, int desc, int pixelHeight) : m_displayList(displayList),
34 m_pixelHeight(pixelHeight),
35 m_pixelAscent(asc), m_pixelDescent(desc)
39 virtual ~GLFontCallList()
41 glDeleteLists(m_displayList, 256);
44 void printString(const char *s)
46 GlobalOpenGL().m_glListBase(m_displayList);
47 GlobalOpenGL().m_glCallLists(GLsizei(strlen(s)), GL_UNSIGNED_BYTE, reinterpret_cast<const GLubyte *>( s ));
50 virtual int getPixelAscent() const
55 virtual int getPixelDescent() const
57 return m_pixelDescent;
60 virtual int getPixelHeight() const
70 #include "debugging/debugging.h"
72 // LordHavoc: this is code for direct Xlib bitmap character fetching, as an
73 // alternative to requiring gtkglarea, it was created due to a lack of this
74 // package on SuSE 9.x but this package is now commonly shipping in Linux
75 // distributions so this code may be unnecessary, feel free however to enable
76 // it when building packages for distros that do not ship with that package,
77 // or if you just prefer less dependencies...
84 GLFont *glfont_create( const char* font_string ){
85 GLuint font_list_base;
86 XFontStruct *fontInfo;
87 Display *dpy = GDK_DISPLAY();
88 unsigned int i, first, last, firstrow, lastrow;
92 fontInfo = XLoadQueryFont( dpy, "-*-fixed-*-*-*-*-8-*-*-*-*-*-*-*" );
93 if ( fontInfo == NULL ) {
94 // try to load other fonts
95 fontInfo = XLoadQueryFont( dpy, "-*-fixed-*-*-*-*-*-*-*-*-*-*-*-*" );
98 if ( fontInfo == NULL ) {
99 fontInfo = XLoadQueryFont( dpy, "-*-*-*-*-*-*-*-*-*-*-*-*-*-*" );
102 if ( fontInfo == NULL ) {
103 ERROR_MESSAGE( "couldn't create font" );
107 first = (int)fontInfo->min_char_or_byte2;
108 last = (int)fontInfo->max_char_or_byte2;
109 firstrow = (int)fontInfo->min_byte1;
110 lastrow = (int)fontInfo->max_byte1;
112 * How many chars in the charset
114 maxchars = 256 * lastrow + last;
115 font_list_base = glGenLists( maxchars + 1 );
116 if ( font_list_base == 0 ) {
117 ERROR_MESSAGE( "couldn't create font" );
121 * Get offset to first char in the charset
123 firstbitmap = 256 * firstrow + first;
125 * for each row of chars, call glXUseXFont to build the bitmaps.
128 for ( i = firstrow; i <= lastrow; i++ )
130 glXUseXFont( fontInfo->fid, firstbitmap, last - first + 1, font_list_base + firstbitmap );
134 /* *height = fontInfo->ascent + fontInfo->descent;
135 *width = fontInfo->max_bounds.width; */
136 return new GLFontCallList( font_list_base, fontInfo->ascent, fontInfo->descent, fontInfo->ascent + fontInfo->descent );
141 #include <gtk/gtkglwidget.h>
143 GLFont *glfont_create( const char* font_string ){
144 GLuint font_list_base = glGenLists( 256 );
145 gint font_height = 0, font_ascent = 0, font_descent = 0;
147 PangoFontDescription* font_desc = pango_font_description_from_string( font_string );
149 PangoFont* font = gdk_gl_font_use_pango_font( font_desc, 0, 256, font_list_base );
152 pango_font_description_free( font_desc );
153 font_desc = pango_font_description_from_string( "fixed 8" );
154 font = gdk_gl_font_use_pango_font( font_desc, 0, 256, font_list_base );
158 pango_font_description_free( font_desc );
159 font_desc = pango_font_description_from_string( "courier new 8" );
160 font = gdk_gl_font_use_pango_font( font_desc, 0, 256, font_list_base );
164 PangoFontMetrics* font_metrics = pango_font_get_metrics( font, 0 );
166 font_ascent = pango_font_metrics_get_ascent( font_metrics );
167 font_descent = pango_font_metrics_get_descent( font_metrics );
168 font_height = font_ascent + font_descent;
170 font_ascent = PANGO_PIXELS( font_ascent );
171 font_descent = PANGO_PIXELS( font_descent );
172 font_height = PANGO_PIXELS( font_height );
174 pango_font_metrics_unref( font_metrics );
177 pango_font_description_free( font_desc );
179 // fix for pango/gtkglext metrix bug
180 if ( font_height > 256 ) {
184 return new GLFontCallList( font_list_base, font_ascent, font_descent, font_height );
188 // new font code ripped from ZeroRadiant
190 #include <pango/pangoft2.h>
191 #include <pango/pango-features.h>
192 #include <pango/pango-utils.h>
194 class GLFontInternal : public GLFont {
195 const char *font_string;
199 int y_offset_bitmap_render_pango_units;
200 PangoContext *ft2_context;
201 PangoFontMap *fontmap;
204 GLFontInternal(const char *_font_string) : font_string(_font_string)
206 PangoFontDescription *font_desc;
208 PangoRectangle log_rect;
209 int font_ascent_pango_units;
210 int font_descent_pango_units;
212 #if !PANGO_VERSION_CHECK(1, 22, 0)
213 ft2_context = pango_ft2_get_context( 72, 72 );
215 fontmap = pango_ft2_font_map_new();
216 pango_ft2_font_map_set_resolution(PANGO_FT2_FONT_MAP(fontmap), 72, 72);
217 ft2_context = pango_font_map_create_context(fontmap);
220 font_desc = pango_font_description_from_string(font_string);
221 //pango_font_description_set_size(font_desc, 10 * PANGO_SCALE);
222 pango_context_set_font_description(ft2_context, font_desc);
223 pango_font_description_free(font_desc);
224 // TODO fallback to fixed 8, courier new 8
226 layout = pango_layout_new(ft2_context);
228 #ifdef FONT_SIZE_WORKAROUND
229 pango_layout_set_width( layout, -1 ); // -1 no wrapping. All text on one line.
230 pango_layout_set_text( layout, "The quick brown fox jumped over the lazy sleeping dog's back then sat on a tack.", -1 ); // -1 null-terminated string.
233 #if !PANGO_VERSION_CHECK(1, 22, 0)
234 PangoLayoutIter *iter;
235 iter = pango_layout_get_iter( layout );
236 font_ascent_pango_units = pango_layout_iter_get_baseline( iter );
237 pango_layout_iter_free( iter );
239 font_ascent_pango_units = pango_layout_get_baseline(layout);
241 pango_layout_get_extents(layout, NULL, &log_rect);
242 g_object_unref(G_OBJECT(layout));
243 font_descent_pango_units = log_rect.height - font_ascent_pango_units;
245 font_ascent = PANGO_PIXELS_CEIL(font_ascent_pango_units);
246 font_descent = PANGO_PIXELS_CEIL(font_descent_pango_units);
247 font_height = font_ascent + font_descent;
248 y_offset_bitmap_render_pango_units = (font_ascent * PANGO_SCALE) - font_ascent_pango_units;
251 virtual ~GLFontInternal()
253 g_object_unref(G_OBJECT(ft2_context));
254 g_object_unref(G_OBJECT(fontmap));
257 // Renders the input text at the current location with the current color.
258 // The X position of the current location is used to place the left edge of the text image,
259 // where the text image bounds are defined as the logical extents of the line of text.
260 // The Y position of the current location is used to place the bottom of the text image.
261 // You should offset the Y position by the amount returned by gtk_glwidget_font_descent()
262 // if you want to place the baseline of the text image at the current Y position.
263 // Note: A problem with this function is that if the lower left corner of the text falls
264 // just a hair outside of the viewport (meaning the current raster position is invalid),
265 // then no text will be rendered. The solution to this is a very hacky one. You can search
266 // Google for "glDrawPixels clipping".
267 virtual void printString(const char *s)
269 // The idea for this code initially came from the font-pangoft2.c example that comes with GtkGLExt.
272 PangoRectangle log_rect;
274 unsigned char *begin_bitmap_buffer;
276 GLint previous_unpack_alignment;
277 GLboolean previous_blend_enabled;
278 GLint previous_blend_func_src;
279 GLint previous_blend_func_dst;
280 GLfloat previous_red_bias;
281 GLfloat previous_green_bias;
282 GLfloat previous_blue_bias;
283 GLfloat previous_alpha_scale;
285 layout = pango_layout_new(ft2_context);
286 pango_layout_set_width(layout, -1); // -1 no wrapping. All text on one line.
287 pango_layout_set_text(layout, s, -1); // -1 null-terminated string.
288 pango_layout_get_extents(layout, NULL, &log_rect);
290 if (log_rect.width > 0 && log_rect.height > 0) {
291 bitmap.rows = font_ascent + font_descent;
292 bitmap.width = PANGO_PIXELS_CEIL(log_rect.width);
293 bitmap.pitch = -bitmap.width; // Rendering it "upside down" for OpenGL.
294 begin_bitmap_buffer = (unsigned char *) g_malloc(bitmap.rows * bitmap.width);
295 memset(begin_bitmap_buffer, 0, bitmap.rows * bitmap.width);
296 bitmap.buffer = begin_bitmap_buffer + (bitmap.rows - 1) * bitmap.width; // See pitch above.
297 bitmap.num_grays = 0xff;
298 bitmap.pixel_mode = FT_PIXEL_MODE_GRAY;
299 pango_ft2_render_layout_subpixel(&bitmap, layout, -log_rect.x,
300 y_offset_bitmap_render_pango_units);
301 GlobalOpenGL().m_glGetFloatv(GL_CURRENT_COLOR, color);
303 // Save state. I didn't see any OpenGL push/pop operations for these.
304 // Question: Is saving/restoring this state necessary? Being safe.
305 GlobalOpenGL().m_glGetIntegerv(GL_UNPACK_ALIGNMENT, &previous_unpack_alignment);
306 previous_blend_enabled = GlobalOpenGL().m_glIsEnabled(GL_BLEND);
307 GlobalOpenGL().m_glGetIntegerv(GL_BLEND_SRC, &previous_blend_func_src);
308 GlobalOpenGL().m_glGetIntegerv(GL_BLEND_DST, &previous_blend_func_dst);
309 GlobalOpenGL().m_glGetFloatv(GL_RED_BIAS, &previous_red_bias);
310 GlobalOpenGL().m_glGetFloatv(GL_GREEN_BIAS, &previous_green_bias);
311 GlobalOpenGL().m_glGetFloatv(GL_BLUE_BIAS, &previous_blue_bias);
312 GlobalOpenGL().m_glGetFloatv(GL_ALPHA_SCALE, &previous_alpha_scale);
314 GlobalOpenGL().m_glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
315 GlobalOpenGL().m_glEnable(GL_BLEND);
316 GlobalOpenGL().m_glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
317 GlobalOpenGL().m_glPixelTransferf(GL_RED_BIAS, color[0]);
318 GlobalOpenGL().m_glPixelTransferf(GL_GREEN_BIAS, color[1]);
319 GlobalOpenGL().m_glPixelTransferf(GL_BLUE_BIAS, color[2]);
320 GlobalOpenGL().m_glPixelTransferf(GL_ALPHA_SCALE, color[3]);
322 GlobalOpenGL().m_glDrawPixels(bitmap.width, bitmap.rows,
323 GL_ALPHA, GL_UNSIGNED_BYTE, begin_bitmap_buffer);
324 g_free(begin_bitmap_buffer);
326 // Restore state in reverse order of how we set it.
327 GlobalOpenGL().m_glPixelTransferf(GL_ALPHA_SCALE, previous_alpha_scale);
328 GlobalOpenGL().m_glPixelTransferf(GL_BLUE_BIAS, previous_blue_bias);
329 GlobalOpenGL().m_glPixelTransferf(GL_GREEN_BIAS, previous_green_bias);
330 GlobalOpenGL().m_glPixelTransferf(GL_RED_BIAS, previous_red_bias);
331 GlobalOpenGL().m_glBlendFunc(previous_blend_func_src, previous_blend_func_dst);
332 if (!previous_blend_enabled) {
333 GlobalOpenGL().m_glDisable(GL_BLEND);
335 GlobalOpenGL().m_glPixelStorei(GL_UNPACK_ALIGNMENT, previous_unpack_alignment);
338 g_object_unref(G_OBJECT(layout));
341 virtual int getPixelAscent() const
346 virtual int getPixelDescent() const
351 virtual int getPixelHeight() const
357 GLFont *glfont_create(const char *font_string)
359 return new GLFontInternal(font_string);