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comparison src/gl-render.cc @ 9834:92d8f35ff217

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compute bounding boxes for text in opengl graphics backend
author Shai Ayal <shaiay@users.sourceforge.net>
date Wed, 18 Nov 2009 23:14:09 -0500
parents 2d6a5af744b6
children fed4aad2cdca
comparison
equal deleted inserted replaced
9833:637fa784d102 9834:92d8f35ff217
3138 glEndList (); 3138 glEndList ();
3139 3139
3140 return ID; 3140 return ID;
3141 } 3141 }
3142 3142
3143 void
3144 opengl_renderer::text_to_pixels (const std::string& txt,
3145 double rotation,
3146 uint8NDArray& pixels,
3147 Matrix& bbox,
3148 int& rot_mode)
3149 {
3150 // FIXME: clip "rotation" between 0 and 360
3151
3152 rot_mode = ft_render::ROTATION_0;
3153
3154 if (rotation == 90.0)
3155 rot_mode = ft_render::ROTATION_90;
3156 else if (rotation == 180.0)
3157 rot_mode = ft_render::ROTATION_180;
3158 else if (rotation == 270.0)
3159 rot_mode = ft_render::ROTATION_270;
3160
3161 text_element *elt = text_parser_none ().parse (txt);
3162 pixels = text_renderer.render (elt, bbox, rot_mode);
3163 delete elt;
3164 }
3165
3143 Matrix 3166 Matrix
3144 opengl_renderer::render_text (const std::string& txt, 3167 opengl_renderer::render_text (const std::string& txt,
3145 double x, double y, double z, 3168 double x, double y, double z,
3146 int halign, int valign, double rotation) 3169 int halign, int valign, double rotation)
3147 { 3170 {
3148 #if HAVE_FREETYPE 3171 #if HAVE_FREETYPE
3149 if (txt.empty ()) 3172 if (txt.empty ())
3150 return Matrix (1, 4, 0.0); 3173 return Matrix (1, 4, 0.0);
3151 3174
3152 // FIXME: clip "rotation" between 0 and 360
3153
3154 int rot_mode = ft_render::ROTATION_0;
3155
3156 if (rotation == 90.0)
3157 rot_mode = ft_render::ROTATION_90;
3158 else if (rotation == 180.0)
3159 rot_mode = ft_render::ROTATION_180;
3160 else if (rotation == 270.0)
3161 rot_mode = ft_render::ROTATION_270;
3162
3163 text_element *elt = text_parser_none ().parse (txt);
3164 Matrix bbox; 3175 Matrix bbox;
3165 uint8NDArray pixels = text_renderer.render (elt, bbox, rot_mode); 3176 uint8NDArray pixels;
3177 int rot_mode;
3178 text_to_pixels (txt, rotation, pixels, bbox, rot_mode);
3179
3166 int x0 = 0, y0 = 0; 3180 int x0 = 0, y0 = 0;
3167 int w = bbox(2), h = bbox(3); 3181 int w = bbox(2), h = bbox(3);
3168 3182
3169 if (pixels.numel () == 0) 3183 if (pixels.numel () == 0)
3170 { 3184 {
3214 GL_RGBA, GL_UNSIGNED_BYTE, pixels.data ()); 3228 GL_RGBA, GL_UNSIGNED_BYTE, pixels.data ());
3215 glDisable (GL_ALPHA_TEST); 3229 glDisable (GL_ALPHA_TEST);
3216 if (! blend) 3230 if (! blend)
3217 glDisable (GL_BLEND); 3231 glDisable (GL_BLEND);
3218 3232
3219 delete elt;
3220
3221 return bbox; 3233 return bbox;
3222 #else 3234 #else
3223 ::warning ("render_text: cannot render text, Freetype library not available"); 3235 ::warning ("render_text: cannot render text, Freetype library not available");
3224 return Matrix (1, 4, 0.0); 3236 return Matrix (1, 4, 0.0);
3225 #endif 3237 #endif