use multiple graphic/text layers for pdf+latex output

Fixed bugs:
  - https://launchpad.net/bugs/771957

(bzr r12487.1.2)

4 files changed, 90 insertions, 6 deletions

diff --git a/src/extension/internal/cairo-render-context.cpp b/src/extension/internal/cairo-render-context.cpp
index 75ec45ad0..3c222bd9e 100644
--- a/src/extension/internal/cairo-render-context.cpp
+++ b/src/extension/internal/cairo-render-context.cpp
@@ -125,7 +125,8 @@ CairoRenderContext::CairoRenderContext(CairoRenderer *parent) :
     _state(NULL),
     _renderer(parent),
     _render_mode(RENDER_MODE_NORMAL),
-    _clip_mode(CLIP_MODE_MASK)
+    _clip_mode(CLIP_MODE_MASK),
+    _omittext_state(EMPTY)
 {
     font_table = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, font_data_free);
 }
@@ -1342,11 +1343,36 @@ CairoRenderContext::_setStrokeStyle(SPStyle const *style, Geom::OptRect const &p
     cairo_set_miter_limit(_cr, MAX(1, style->stroke_miterlimit.value));
 }
 
+void
+CairoRenderContext::_prepareRenderGraphic()
+{
+    // Only PDFLaTeX supports importing a single page of a graphics file,
+    // so only PDF backend gets interleaved text/graphics
+    if (_is_omittext && _target == CAIRO_SURFACE_TYPE_PDF) {
+        if (_omittext_state == NEW_PAGE_ON_GRAPHIC)
+            cairo_show_page(_cr);
+        _omittext_state = GRAPHIC_ON_TOP;
+    }
+}
+
+void
+CairoRenderContext::_prepareRenderText()
+{
+    // Only PDFLaTeX supports importing a single page of a graphics file,
+    // so only PDF backend gets interleaved text/graphics
+    if (_is_omittext && _target == CAIRO_SURFACE_TYPE_PDF) {
+        if (_omittext_state == GRAPHIC_ON_TOP)
+            _omittext_state = NEW_PAGE_ON_GRAPHIC;
+    }
+}
+
 bool
 CairoRenderContext::renderPathVector(Geom::PathVector const & pathv, SPStyle const *style, Geom::OptRect const &pbox)
 {
     g_assert( _is_valid );
 
+    _prepareRenderGraphic();
+
     if (_render_mode == RENDER_MODE_CLIP) {
         if (_clip_mode == CLIP_MODE_PATH) {
             addClipPath(pathv, &style->fill_rule);
@@ -1419,6 +1445,8 @@ bool CairoRenderContext::renderImage(GdkPixbuf *pb,
         return true;
     }
 
+    _prepareRenderGraphic();
+
     int w = gdk_pixbuf_get_width (pb);
     int h = gdk_pixbuf_get_height (pb);
 
@@ -1500,7 +1528,9 @@ unsigned int CairoRenderContext::_showGlyphs(cairo_t *cr, PangoFont * /*font*/,
 bool
 CairoRenderContext::renderGlyphtext(PangoFont *font, Geom::Affine const &font_matrix,
                                     std::vector<CairoGlyphInfo> const &glyphtext, SPStyle const *style)
-{
+{    
+
+    _prepareRenderText();
     if (_is_omittext)
         return true;
 
diff --git a/src/extension/internal/cairo-render-context.h b/src/extension/internal/cairo-render-context.h
index e66d4bf00..f8426aebe 100644
--- a/src/extension/internal/cairo-render-context.h
+++ b/src/extension/internal/cairo-render-context.h
@@ -155,6 +155,12 @@ protected:
     CairoRenderContext(CairoRenderer *renderer);
     virtual ~CairoRenderContext(void);
 
+    enum CairoOmitTextPageState {
+        EMPTY,
+        GRAPHIC_ON_TOP,
+        NEW_PAGE_ON_GRAPHIC
+    };
+
     float _width;
     float _height;
     unsigned short _dpi;
@@ -188,6 +194,8 @@ protected:
     CairoRenderMode _render_mode;
     CairoClipMode _clip_mode;
 
+    CairoOmitTextPageState _omittext_state;
+
     cairo_pattern_t *_createPatternForPaintServer(SPPaintServer const *const paintserver,
                                                   Geom::OptRect const &pbox, float alpha);
     cairo_pattern_t *_createPatternPainter(SPPaintServer const *const paintserver, Geom::OptRect const &pbox);
@@ -202,6 +210,9 @@ protected:
     void _concatTransform(cairo_t *cr, double xx, double yx, double xy, double yy, double x0, double y0);
     void _concatTransform(cairo_t *cr, Geom::Affine const &transform);
 
+    void _prepareRenderGraphic(void);
+    void _prepareRenderText(void);
+
     GHashTable *font_table;
     static void font_data_free(gpointer data);
 
diff --git a/src/extension/internal/latex-text-renderer.cpp b/src/extension/internal/latex-text-renderer.cpp
index 57a71b467..55d8d8352 100644
--- a/src/extension/internal/latex-text-renderer.cpp
+++ b/src/extension/internal/latex-text-renderer.cpp
@@ -98,7 +98,9 @@ latex_render_document_text_to_file( SPDocument *doc, gchar const *filename,
 LaTeXTextRenderer::LaTeXTextRenderer(bool pdflatex)
   : _stream(NULL),
     _filename(NULL),
-    _pdflatex(pdflatex)
+    _pdflatex(pdflatex),
+    _omittext_state(EMPTY),
+    _omittext_page(1)
 {
     push_transform(Geom::identity());
 }
@@ -262,6 +264,11 @@ LaTeXTextRenderer::sp_use_render(SPItem *item)
 void
 LaTeXTextRenderer::sp_text_render(SPItem *item)
 {
+    // Only PDFLaTeX supports importing a single page of a graphics file,
+    // so only PDF backend gets interleaved text/graphics
+    if (_pdflatex && _omittext_state ==  GRAPHIC_ON_TOP)
+        _omittext_state = NEW_PAGE_ON_GRAPHIC;
+
     SPText *textobj = SP_TEXT (item);
     SPStyle *style = item->style;
 
@@ -395,6 +402,11 @@ Flowtext is possible by using a minipage! :)
 Flowing in rectangle is possible, not in arb shape.
 */
 
+    // Only PDFLaTeX supports importing a single page of a graphics file,
+    // so only PDF backend gets interleaved text/graphics
+    if (_pdflatex && _omittext_state ==  GRAPHIC_ON_TOP)
+        _omittext_state = NEW_PAGE_ON_GRAPHIC;
+
     SPFlowtext *flowtext = SP_FLOWTEXT(item);
     SPStyle *style = item->style;
 
@@ -556,8 +568,13 @@ LaTeXTextRenderer::sp_item_invoke_render(SPItem *item)
         return sp_text_render(item);
     } else if (SP_IS_FLOWTEXT(item)) {
         return sp_flowtext_render(item);
+    } else {
+        // Only PDFLaTeX supports importing a single page of a graphics file,
+        // so only PDF backend gets interleaved text/graphics
+        if (_pdflatex && (_omittext_state == EMPTY || _omittext_state == NEW_PAGE_ON_GRAPHIC))
+            writeGraphicPage();
+        _omittext_state = GRAPHIC_ON_TOP;
     }
-    // We are not interested in writing the other SPItem types to LaTeX
 }
 
 void
@@ -568,6 +585,20 @@ LaTeXTextRenderer::renderItem(SPItem *item)
     pop_transform();
 }
 
+void
+LaTeXTextRenderer::writeGraphicPage(void) {
+    Inkscape::SVGOStringStream os;
+    os.setf(std::ios::fixed); // no scientific notation
+
+    // strip pathname, as it is probably desired. Having a specific path in the TeX file is not convenient.
+    if (_pdflatex)
+        os << "    \\put(0,0){\\includegraphics[width=\\unitlength,page=" << _omittext_page++ << "]{" << _filename << "}}%\n";
+    else
+        os << "    \\put(0,0){\\includegraphics[width=\\unitlength]{" << _filename << "}}%\n";
+
+    fprintf(_stream, "%s", os.str().c_str());
+}
+
 bool
 LaTeXTextRenderer::setupDocument(SPDocument *doc, bool pageBoundingBox, float bleedmargin_px, SPItem *base)
 {
@@ -625,11 +656,12 @@ LaTeXTextRenderer::setupDocument(SPDocument *doc, bool pageBoundingBox, float bl
     os << "  \\makeatother%\n";
 
     os << "  \\begin{picture}(" << _width << "," << _height << ")%\n";
-    // strip pathname, as it is probably desired. Having a specific path in the TeX file is not convenient.
-    os << "    \\put(0,0){\\includegraphics[width=\\unitlength]{" << _filename << "}}%\n";
 
     fprintf(_stream, "%s", os.str().c_str());
 
+    if (!_pdflatex)
+        writeGraphicPage();
+
     return true;
 }
 
diff --git a/src/extension/internal/latex-text-renderer.h b/src/extension/internal/latex-text-renderer.h
index 0fa94c9e6..9aecf5ed9 100644
--- a/src/extension/internal/latex-text-renderer.h
+++ b/src/extension/internal/latex-text-renderer.h
@@ -47,11 +47,20 @@ public:
     void renderItem(SPItem *item);
 
 protected:
+    enum LaTeXOmitTextPageState {
+        EMPTY,
+        GRAPHIC_ON_TOP,
+        NEW_PAGE_ON_GRAPHIC
+    };
+
     FILE * _stream;
     gchar * _filename;
 
     bool _pdflatex; /** true if ouputting for pdfLaTeX*/
 
+    LaTeXOmitTextPageState _omittext_state;
+    gulong _omittext_page;
+
     void push_transform(Geom::Affine const &transform);
     Geom::Affine const & transform();
     void pop_transform();
@@ -60,6 +69,8 @@ protected:
     void writePreamble();
     void writePostamble();
 
+    void writeGraphicPage();
+
     void sp_item_invoke_render(SPItem *item);
     void sp_root_render(SPRoot *item);
     void sp_group_render(SPItem *item);