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
25 // generic string printing with call lists
26 class GLFontCallList: public GLFont
33 GLFontCallList(GLuint displayList, int asc, int desc, int pixelHeight) : m_displayList(displayList), m_pixelHeight(pixelHeight), m_pixelAscent(asc), m_pixelDescent(desc)
36 virtual ~GLFontCallList()
38 glDeleteLists(m_displayList, 256);
40 void printString(const char *s)
42 GlobalOpenGL().m_glListBase(m_displayList);
43 GlobalOpenGL().m_glCallLists(GLsizei(strlen(s)), GL_UNSIGNED_BYTE, reinterpret_cast<const GLubyte*>(s));
45 virtual int getPixelAscent() const
49 virtual int getPixelDescent() const
51 return m_pixelDescent;
53 virtual int getPixelHeight() const
62 #include "debugging/debugging.h"
64 // LordHavoc: this is code for direct Xlib bitmap character fetching, as an
65 // alternative to requiring gtkglarea, it was created due to a lack of this
66 // package on SuSE 9.x but this package is now commonly shipping in Linux
67 // distributions so this code may be unnecessary, feel free however to enable
68 // it when building packages for distros that do not ship with that package,
69 // or if you just prefer less dependencies...
76 GLFont *glfont_create(const char* font_string)
78 GLuint font_list_base;
79 XFontStruct *fontInfo;
80 Display *dpy = GDK_DISPLAY ();
81 unsigned int i, first, last, firstrow, lastrow;
85 fontInfo = XLoadQueryFont (dpy, "-*-fixed-*-*-*-*-8-*-*-*-*-*-*-*");
88 // try to load other fonts
89 fontInfo = XLoadQueryFont (dpy, "-*-fixed-*-*-*-*-*-*-*-*-*-*-*-*");
93 fontInfo = XLoadQueryFont(dpy, "-*-*-*-*-*-*-*-*-*-*-*-*-*-*");
96 ERROR_MESSAGE("couldn't create font");
99 first = (int)fontInfo->min_char_or_byte2;
100 last = (int)fontInfo->max_char_or_byte2;
101 firstrow = (int)fontInfo->min_byte1;
102 lastrow = (int)fontInfo->max_byte1;
104 * How many chars in the charset
106 maxchars = 256 * lastrow + last;
107 font_list_base = glGenLists(maxchars+1);
108 if (font_list_base == 0)
110 ERROR_MESSAGE( "couldn't create font" );
114 * Get offset to first char in the charset
116 firstbitmap = 256 * firstrow + first;
118 * for each row of chars, call glXUseXFont to build the bitmaps.
121 for(i=firstrow; i<=lastrow; i++)
123 glXUseXFont(fontInfo->fid, firstbitmap, last-first+1, font_list_base+firstbitmap);
127 /* *height = fontInfo->ascent + fontInfo->descent;
128 *width = fontInfo->max_bounds.width; */
129 return new GLFontCallList(font_list_base, fontInfo->ascent, fontInfo->descent, fontInfo->ascent + fontInfo->descent);
134 #include <gtk/gtkglwidget.h>
136 GLFont *glfont_create(const char* font_string)
138 GLuint font_list_base = glGenLists (256);
139 gint font_height = 0, font_ascent = 0, font_descent = 0;
141 PangoFontDescription* font_desc = pango_font_description_from_string (font_string);
143 PangoFont* font = gdk_gl_font_use_pango_font (font_desc, 0, 256, font_list_base);
147 pango_font_description_free (font_desc);
148 font_desc = pango_font_description_from_string ("fixed 8");
149 font = gdk_gl_font_use_pango_font (font_desc, 0, 256, font_list_base);
154 pango_font_description_free (font_desc);
155 font_desc = pango_font_description_from_string ("courier new 8");
156 font = gdk_gl_font_use_pango_font (font_desc, 0, 256, font_list_base);
161 PangoFontMetrics* font_metrics = pango_font_get_metrics (font, 0);
163 font_ascent = pango_font_metrics_get_ascent (font_metrics);
164 font_descent = pango_font_metrics_get_descent (font_metrics);
165 font_height = font_ascent + font_descent;
167 font_ascent = PANGO_PIXELS (font_ascent);
168 font_descent = PANGO_PIXELS (font_descent);
169 font_height = PANGO_PIXELS (font_height);
171 pango_font_metrics_unref (font_metrics);
174 pango_font_description_free (font_desc);
176 // fix for pango/gtkglext metrix bug
177 if(font_height > 256)
180 return new GLFontCallList(font_list_base, font_ascent, font_descent, font_height);
184 // new font code ripped from ZeroRadiant
186 #include <pango/pangoft2.h>
187 #include <pango/pango-utils.h>
189 class GLFontInternal: public GLFont
191 const char *font_string;
195 int y_offset_bitmap_render_pango_units;
196 PangoContext *ft2_context;
197 PangoFontMap *fontmap;
200 GLFontInternal(const char *_font_string): font_string(_font_string)
202 PangoFontDescription *font_desc;
204 PangoRectangle log_rect;
205 int font_ascent_pango_units;
206 int font_descent_pango_units;
208 #if !PANGO_VERSION_CHECK(1,22,0)
209 ft2_context = pango_ft2_get_context(96, 96);
211 fontmap = pango_ft2_font_map_new();
212 //pango_ft2_font_map_set_resolution(PANGO_FT2_FONT_MAP(fontmap), 96, 96);
213 ft2_context = pango_font_map_create_context(fontmap);
216 font_desc = pango_font_description_from_string(font_string);
217 //pango_font_description_set_size(font_desc, 10 * PANGO_SCALE);
218 pango_context_set_font_description(ft2_context, font_desc);
219 pango_font_description_free(font_desc);
220 // TODO fallback to fixed 8, courier new 8
222 layout = pango_layout_new(ft2_context);
224 #ifdef FONT_SIZE_WORKAROUND
225 pango_layout_set_width(layout, -1); // -1 no wrapping. All text on one line.
226 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.
229 #if !PANGO_VERSION_CHECK(1,22,0)
230 PangoLayoutIter *iter;
231 iter = pango_layout_get_iter(layout);
232 font_ascent_pango_units = pango_layout_iter_get_baseline(iter);
233 pango_layout_iter_free(iter);
235 font_ascent_pango_units = pango_layout_get_baseline(layout);
237 pango_layout_get_extents(layout, NULL, &log_rect);
238 g_object_unref(G_OBJECT(layout));
239 font_descent_pango_units = log_rect.height - font_ascent_pango_units;
241 font_ascent = PANGO_PIXELS_CEIL(font_ascent_pango_units);
242 font_descent = PANGO_PIXELS_CEIL(font_descent_pango_units);
243 font_height = font_ascent + font_descent;
244 y_offset_bitmap_render_pango_units = (font_ascent * PANGO_SCALE) - font_ascent_pango_units;
247 virtual ~GLFontInternal()
249 g_object_unref(G_OBJECT(ft2_context));
250 g_object_unref(G_OBJECT(fontmap));
253 // Renders the input text at the current location with the current color.
254 // The X position of the current location is used to place the left edge of the text image,
255 // where the text image bounds are defined as the logical extents of the line of text.
256 // The Y position of the current location is used to place the bottom of the text image.
257 // You should offset the Y position by the amount returned by gtk_glwidget_font_descent()
258 // if you want to place the baseline of the text image at the current Y position.
259 // Note: A problem with this function is that if the lower left corner of the text falls
260 // just a hair outside of the viewport (meaning the current raster position is invalid),
261 // then no text will be rendered. The solution to this is a very hacky one. You can search
262 // Google for "glDrawPixels clipping".
263 virtual void printString(const char *s)
265 // The idea for this code initially came from the font-pangoft2.c example that comes with GtkGLExt.
268 PangoRectangle log_rect;
270 unsigned char *begin_bitmap_buffer;
272 GLint previous_unpack_alignment;
273 GLboolean previous_blend_enabled;
274 GLint previous_blend_func_src;
275 GLint previous_blend_func_dst;
276 GLfloat previous_red_bias;
277 GLfloat previous_green_bias;
278 GLfloat previous_blue_bias;
279 GLfloat previous_alpha_scale;
281 layout = pango_layout_new(ft2_context);
282 pango_layout_set_width(layout, -1); // -1 no wrapping. All text on one line.
283 pango_layout_set_text(layout, s, -1); // -1 null-terminated string.
284 pango_layout_get_extents(layout, NULL, &log_rect);
286 if (log_rect.width > 0 && log_rect.height > 0) {
287 bitmap.rows = font_ascent + font_descent;
288 bitmap.width = PANGO_PIXELS_CEIL(log_rect.width);
289 bitmap.pitch = -bitmap.width; // Rendering it "upside down" for OpenGL.
290 begin_bitmap_buffer = (unsigned char *) g_malloc(bitmap.rows * bitmap.width);
291 memset(begin_bitmap_buffer, 0, bitmap.rows * bitmap.width);
292 bitmap.buffer = begin_bitmap_buffer + (bitmap.rows - 1) * bitmap.width; // See pitch above.
293 bitmap.num_grays = 0xff;
294 bitmap.pixel_mode = FT_PIXEL_MODE_GRAY;
295 pango_ft2_render_layout_subpixel(&bitmap, layout, -log_rect.x,
296 y_offset_bitmap_render_pango_units);
297 GlobalOpenGL().m_glGetFloatv(GL_CURRENT_COLOR, color);
299 // Save state. I didn't see any OpenGL push/pop operations for these.
300 // Question: Is saving/restoring this state necessary? Being safe.
301 GlobalOpenGL().m_glGetIntegerv(GL_UNPACK_ALIGNMENT, &previous_unpack_alignment);
302 previous_blend_enabled = GlobalOpenGL().m_glIsEnabled(GL_BLEND);
303 GlobalOpenGL().m_glGetIntegerv(GL_BLEND_SRC, &previous_blend_func_src);
304 GlobalOpenGL().m_glGetIntegerv(GL_BLEND_DST, &previous_blend_func_dst);
305 GlobalOpenGL().m_glGetFloatv(GL_RED_BIAS, &previous_red_bias);
306 GlobalOpenGL().m_glGetFloatv(GL_GREEN_BIAS, &previous_green_bias);
307 GlobalOpenGL().m_glGetFloatv(GL_BLUE_BIAS, &previous_blue_bias);
308 GlobalOpenGL().m_glGetFloatv(GL_ALPHA_SCALE, &previous_alpha_scale);
310 GlobalOpenGL().m_glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
311 GlobalOpenGL().m_glEnable(GL_BLEND);
312 GlobalOpenGL().m_glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
313 GlobalOpenGL().m_glPixelTransferf(GL_RED_BIAS, color[0]);
314 GlobalOpenGL().m_glPixelTransferf(GL_GREEN_BIAS, color[1]);
315 GlobalOpenGL().m_glPixelTransferf(GL_BLUE_BIAS, color[2]);
316 GlobalOpenGL().m_glPixelTransferf(GL_ALPHA_SCALE, color[3]);
318 GlobalOpenGL().m_glDrawPixels(bitmap.width, bitmap.rows,
319 GL_ALPHA, GL_UNSIGNED_BYTE, begin_bitmap_buffer);
320 g_free(begin_bitmap_buffer);
322 // Restore state in reverse order of how we set it.
323 GlobalOpenGL().m_glPixelTransferf(GL_ALPHA_SCALE, previous_alpha_scale);
324 GlobalOpenGL().m_glPixelTransferf(GL_BLUE_BIAS, previous_blue_bias);
325 GlobalOpenGL().m_glPixelTransferf(GL_GREEN_BIAS, previous_green_bias);
326 GlobalOpenGL().m_glPixelTransferf(GL_RED_BIAS, previous_red_bias);
327 GlobalOpenGL().m_glBlendFunc(previous_blend_func_src, previous_blend_func_dst);
328 if (!previous_blend_enabled) { GlobalOpenGL().m_glDisable(GL_BLEND); }
329 GlobalOpenGL().m_glPixelStorei(GL_UNPACK_ALIGNMENT, previous_unpack_alignment);
332 g_object_unref(G_OBJECT(layout));
335 virtual int getPixelAscent() const
339 virtual int getPixelDescent() const
343 virtual int getPixelHeight() const
349 GLFont *glfont_create(const char* font_string)
351 return new GLFontInternal(font_string);