Function agg2GetTruetypeTextBBox

mapagg.cpp:735–799

helper functions */

/* helper functions */
int agg2GetTruetypeTextBBox(rendererVTableObj *renderer, char *font, double size, char *string,
        rectObj *rect, double **advances) {
   
   aggRendererCache *cache = (aggRendererCache*)MS_RENDERER_CACHE(renderer);
   if (!cache->m_feng.load_font(font, 0, mapserver::glyph_ren_outline)) {
      msSetError(MS_TTFERR, "AGG error loading font (%s)", "agg2GetTruetypeTextBBox()", font);
      return MS_FAILURE;
   }
   cache->m_feng.hinting(true);
   cache->m_feng.height(size);
   cache->m_feng.resolution(96);
   cache->m_feng.flip_y(true);
   int unicode, curGlyph = 1, numglyphs = 0;
   if (advances) {
      numglyphs = msGetNumGlyphs(string);
   }
   const mapserver::glyph_cache* glyph;
   string += msUTF8ToUniChar(string, &unicode);
   glyph = cache->m_fman.glyph(unicode);
   if (glyph) {
      rect->minx = glyph->bounds.x1;
      rect->maxx = glyph->bounds.x2;
      rect->miny = glyph->bounds.y1;
      rect->maxy = glyph->bounds.y2;
   } else
      return MS_FAILURE;
   if (advances) {
      *advances = (double*) malloc(numglyphs * sizeof (double));
      MS_CHECK_ALLOC(*advances, numglyphs * sizeof (double), MS_FAILURE);
      (*advances)[0] = glyph->advance_x;
   }
   double fx = glyph->advance_x, fy = glyph->advance_y;
   while (*string) {
      if (advances) {
         if (*string == '\r' || *string == '\n')
            (*advances)[curGlyph++] = -fx;
      }
      if (*string == '\r') {
         fx = 0;
         string++;
         continue;
      }
      if (*string == '\n') {
         fx = 0;
         fy += ceil(size * AGG_LINESPACE);
         string++;
         continue;
      }
      string += msUTF8ToUniChar(string, &unicode);
      glyph = cache->m_fman.glyph(unicode);
      if (glyph) {
         rect->minx = MS_MIN(rect->minx, fx+glyph->bounds.x1);
         rect->miny = MS_MIN(rect->miny, fy+glyph->bounds.y1);
         rect->maxx = MS_MAX(rect->maxx, fx+glyph->bounds.x2);
         rect->maxy = MS_MAX(rect->maxy, fy+glyph->bounds.y2);

         fx += glyph->advance_x;
         fy += glyph->advance_y;