Better preview for images.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@38192 a592a061-630c-0410-9148-cb99ea01b6c8

diff --git a/src/mathed/InsetMathHull.cpp b/src/mathed/InsetMathHull.cpp
index ab198f23f3d1826d51f2d465dc306783539bca4d..279da91f9b67bff63cde2779f380daad2a996163 100644 (file)
--- a/src/mathed/InsetMathHull.cpp
+++ b/src/mathed/InsetMathHull.cpp
@@ -2145,19 +2145,26 @@ docstring InsetMathHull::xhtml(XHTMLStream & xs, OutputParams const & op) const
        // but what follows is equivalent, since we'll enter only if either (a) we 
        // tried and failed with MathML or HTML or (b) didn't try yet at all but
        // aren't doing LaTeX, in which case we are doing Images.
-       if (!success && mathtype != BufferParams::LaTeX && !op.dryrun) {
-               loadPreview(docit_);
-               graphics::PreviewImage const * pimage = preview_->getPreviewImage(buffer());
-               if (pimage) {
+       if (!success && mathtype != BufferParams::LaTeX) {
+               graphics::PreviewImage const * pimage = 0;
+               if (!op.dryrun) {
+                       loadPreview(docit_);
+                       pimage = preview_->getPreviewImage(buffer());
                        // FIXME Do we always have png?
+               }
+
+               if (pimage || op.dryrun) {
+                       string const filename = pimage ? pimage->filename().onlyFileName()
+                                                      : "previewimage.png";
                        string const tag = (getType() == hullSimple) ? "span" : "div";
-                       FileName const & mathimg = pimage->filename();
-                       xs << html::StartTag(tag)
-                          << html::CompTag("img", "src=\"" + mathimg.onlyFileName() + "\"")
-                          << html::EndTag(tag)
-                          << html::CR();
-                       // add the file to the list of files to be exported
-                       op.exportdata->addExternalFile("xhtml", mathimg);
+                       xs << html::CR()
+                          << html::StartTag(tag)
+                                << html::CompTag("img", "src=\"" + filename + "\"")
+                                << html::EndTag(tag)
+                                << html::CR();
+                       if (pimage)
+                               // add the file to the list of files to be exported
+                               op.exportdata->addExternalFile("xhtml", pimage->filename());
                        success = true;
                }
        }