(svn r26389) -Fix [FS#5885]: Select a specific font size when freetype fails to select one automatically.

src/fontcache.cpp

@@ -274,23 +274,35 @@ FreeTypeFontCache::FreeTypeFontCache(FontSize fs, FT_Face face, int pixels) : Fo
 	}
 
 	FT_Error err = FT_Set_Pixel_Sizes(this->face, 0, pixels);
-	if (err == FT_Err_Invalid_Pixel_Size) {
+	if (err != FT_Err_Ok) {
 
 		/* Find nearest size to that requested */
 		FT_Bitmap_Size *bs = this->face->available_sizes;
 		int i = this->face->num_fixed_sizes;
-		int n = bs->height;
-		for (; --i; bs++) {
-			if (abs(pixels - bs->height) < abs(pixels - n)) n = bs->height;
-		}
+		if (i > 0) { // In pathetic cases one might get no fixed sizes at all.
+			int n = bs->height;
+			FT_Int chosen = 0;
+			for (; --i; bs++) {
+				if (abs(pixels - bs->height) >= abs(pixels - n)) continue;
+				n = bs->height;
+				chosen = this->face->num_fixed_sizes - i;
+			}
 
-		FT_Set_Pixel_Sizes(this->face, 0, n);
+			/* Don't use FT_Set_Pixel_Sizes here - it might give us another
+			 * error, even though the size is available (FS#5885). */
+			err = FT_Select_Size(this->face, chosen);
+		}
 	}
 
-	this->units_per_em = this->face->units_per_EM;
-	this->ascender     = this->face->size->metrics.ascender >> 6;
-	this->descender    = this->face->size->metrics.descender >> 6;
-	this->height       = this->ascender - this->descender;
+	if (err == FT_Err_Ok) {
+		this->units_per_em = this->face->units_per_EM;
+		this->ascender     = this->face->size->metrics.ascender >> 6;
+		this->descender    = this->face->size->metrics.descender >> 6;
+		this->height       = this->ascender - this->descender;
+	} else {
+		/* Both FT_Set_Pixel_Sizes and FT_Select_Size failed. */
+		DEBUG(freetype, 0, "Font size selection failed. Using FontCache defaults.");
+	}
 }
 
 /**