Adding upstream version 1.3+ds.upstream/1.3+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 259 insertions, 0 deletions

diff --git a/src/extension/internal/cairo-renderer-pdf-out.cpp b/src/extension/internal/cairo-renderer-pdf-out.cpp
new file mode 100644
index 0000000..3380305
--- /dev/null
+++ b/src/extension/internal/cairo-renderer-pdf-out.cpp
@@ -0,0 +1,259 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * A quick hack to use the Cairo renderer to write out a file.  This
+ * then makes 'save as...' PDF.
+ *
+ * Authors:
+ *   Ted Gould <ted@gould.cx>
+ *   Ulf Erikson <ulferikson@users.sf.net>
+ *   Johan Engelen <goejendaagh@zonnet.nl>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 2004-2010 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <cairo.h>
+#ifdef CAIRO_HAS_PDF_SURFACE
+
+#include "cairo-renderer-pdf-out.h"
+#include "cairo-render-context.h"
+#include "cairo-renderer.h"
+#include "latex-text-renderer.h"
+#include "path-chemistry.h"
+#include <print.h>
+#include "extension/system.h"
+#include "extension/print.h"
+#include "extension/db.h"
+#include "extension/output.h"
+
+#include "display/drawing.h"
+#include "display/curve.h"
+
+#include "object/sp-item.h"
+#include "object/sp-root.h"
+#include "object/sp-page.h"
+
+#include <2geom/affine.h>
+#include "page-manager.h"
+#include "document.h"
+
+#include "util/units.h"
+
+namespace Inkscape {
+namespace Extension {
+namespace Internal {
+
+bool CairoRendererPdfOutput::check(Inkscape::Extension::Extension * /*module*/)
+{
+    bool result = true;
+
+    if (nullptr == Inkscape::Extension::db.get("org.inkscape.output.pdf.cairorenderer")) {
+        result = false;
+    }
+
+    return result;
+}
+
+// TODO: Make this function more generic so that it can do both PostScript and PDF; expose in the headers
+static bool
+pdf_render_document_to_file(SPDocument *doc, gchar const *filename, unsigned int level, PDFOptions flags,
+                            int resolution)
+{
+    if (flags.text_to_path) {
+        assert(!flags.text_to_latex);
+        // Cairo's text-to-path method has numerical precision and font matching
+        // issues (https://gitlab.com/inkscape/inkscape/-/issues/1979).
+        // We get better results by using Inkscape's Object-to-Path method.
+        Inkscape::convert_text_to_curves(doc);
+    }
+
+    doc->ensureUpToDate();
+
+    SPRoot *root = doc->getRoot();
+    if (!root) {
+        return false;
+    }
+    
+    /* Create new drawing */
+    Inkscape::Drawing drawing;
+    unsigned dkey = SPItem::display_key_new(1);
+    drawing.setRoot(root->invoke_show(drawing, dkey, SP_ITEM_SHOW_DISPLAY));
+    drawing.setExact();
+
+    /* Create renderer and context */
+    CairoRenderer *renderer = new CairoRenderer();
+    CairoRenderContext *ctx = renderer->createContext();
+    ctx->setPDFLevel(level);
+    ctx->setTextToPath(flags.text_to_path);
+    ctx->setOmitText(flags.text_to_latex);
+    ctx->setFilterToBitmap(flags.rasterize_filters);
+    ctx->setBitmapResolution(resolution);
+
+    bool ret = ctx->setPdfTarget (filename);
+    if(ret) {
+        /* Render document */
+        ret = renderer->setupDocument(ctx, doc, root);
+        if (ret) {
+            /* Render multiple pages */
+            ret = renderer->renderPages(ctx, doc, flags.stretch_to_fit);
+            ctx->finish();
+        }
+    }
+
+    root->invoke_hide(dkey);
+
+    renderer->destroyContext(ctx);
+    delete renderer;
+
+    return ret;
+}
+
+/**
+    \brief  This function calls the output module with the filename
+    \param  mod   unused
+    \param  doc   Document to be saved
+    \param  filename   Filename to save to (probably will end in .pdf)
+
+    The most interesting thing that this function does is just attach
+    an '>' on the front of the filename.  This is the syntax used to
+    tell the printing system to save to file.
+*/
+void
+CairoRendererPdfOutput::save(Inkscape::Extension::Output *mod, SPDocument *doc, gchar const *filename)
+{
+    Inkscape::Extension::Extension * ext;
+    unsigned int ret;
+
+    ext = Inkscape::Extension::db.get("org.inkscape.output.pdf.cairorenderer");
+    if (ext == nullptr)
+        return;
+
+    int level = 0;
+    try {
+        const gchar *new_level = mod->get_param_optiongroup("PDFversion");
+        if((new_level != nullptr) && (g_ascii_strcasecmp("PDF-1.5", new_level) == 0)) {
+            level = 1;
+        }
+    }
+    catch(...) {
+        g_warning("Parameter <PDFversion> might not exist");
+    }
+
+    PDFOptions flags;
+    flags.text_to_path = false;
+    try {
+        flags.text_to_path = (strcmp(mod->get_param_optiongroup("textToPath"), "paths") == 0);
+    }
+    catch(...) {
+        g_warning("Parameter <textToPath> might not exist");
+    }
+
+    flags.text_to_latex = false;
+    try {
+        flags.text_to_latex = (strcmp(mod->get_param_optiongroup("textToPath"), "LaTeX") == 0);
+    }
+    catch(...) {
+        g_warning("Parameter <textToLaTeX> might not exist");
+    }
+
+    flags.rasterize_filters = false;
+    try {
+        flags.rasterize_filters = mod->get_param_bool("blurToBitmap");
+    }
+    catch(...) {
+        g_warning("Parameter <blurToBitmap> might not exist");
+    }
+
+    int new_bitmapResolution  = 72;
+    try {
+        new_bitmapResolution = mod->get_param_int("resolution");
+    }
+    catch(...) {
+        g_warning("Parameter <resolution> might not exist");
+    }
+
+    flags.stretch_to_fit = false;
+    try {
+        flags.stretch_to_fit = (strcmp(ext->get_param_optiongroup("stretch"), "relative") == 0);
+    } catch(...) {
+        g_warning("Parameter <stretch> might not exist");
+    }
+
+    // Create PDF file
+    {
+        gchar * final_name;
+        final_name = g_strdup_printf("> %s", filename);
+        ret = pdf_render_document_to_file(doc, final_name, level, flags, new_bitmapResolution);
+        g_free(final_name);
+
+        if (!ret)
+            throw Inkscape::Extension::Output::save_failed();
+    }
+
+    // Create LaTeX file (if requested)
+    if (flags.text_to_latex) {
+        ret = latex_render_document_text_to_file(doc, filename, true);
+
+        if (!ret)
+            throw Inkscape::Extension::Output::save_failed();
+    }
+}
+
+#include "clear-n_.h"
+
+/**
+    \brief   A function allocate a copy of this function.
+
+    This is the definition of Cairo PDF out.  This function just
+    calls the extension system with the memory allocated XML that
+    describes the data.
+*/
+void
+CairoRendererPdfOutput::init ()
+{
+    // clang-format off
+    Inkscape::Extension::build_from_mem(
+        "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
+            "<name>Portable Document Format</name>\n"
+            "<id>org.inkscape.output.pdf.cairorenderer</id>\n"
+            "<param name=\"PDFversion\" gui-text=\"" N_("Restrict to PDF version:") "\" type=\"optiongroup\" appearance=\"combo\" >\n"
+                "<option value='PDF-1.5'>" N_("PDF 1.5") "</option>\n"
+                "<option value='PDF-1.4'>" N_("PDF 1.4") "</option>\n"
+            "</param>\n"
+            "<param name=\"textToPath\" gui-text=\"" N_("Text output options:") "\" type=\"optiongroup\" appearance=\"radio\">\n"
+                "<option value=\"embed\">" N_("Embed fonts") "</option>\n"
+                "<option value=\"paths\">" N_("Convert text to paths") "</option>\n"
+                "<option value=\"LaTeX\">" N_("Omit text in PDF and create LaTeX file") "</option>\n"
+            "</param>\n"
+            "<param name=\"blurToBitmap\" gui-text=\"" N_("Rasterize filter effects") "\" type=\"bool\">true</param>\n"
+            "<param name=\"resolution\" gui-text=\"" N_("Resolution for rasterization (dpi):") "\" type=\"int\" min=\"1\" max=\"10000\">96</param>\n"
+            "<spacer size=\"10\" />"
+            "<param name=\"stretch\" gui-text=\"" N_("Rounding compensation:") "\" gui-description=\""
+                N_("Exporting to PDF rounds the document size to the next whole number in pt units. Compensation may stretch the drawing slightly (up to 0.35mm for width and/or height). When not compensating, object sizes will be preserved strictly, but this can sometimes cause white gaps along the page margins.")
+                "\" type=\"optiongroup\" appearance=\"radio\" >\n"
+                "<option value=\"relative\">" N_("Compensate for rounding (recommended)") "</option>"
+                "<option value=\"absolute\">" N_("Do not compensate") "</option>"
+            "</param><separator/>"
+            "<hbox indent=\"1\"><image>info-outline</image><spacer/><vbox><spacer/>"
+                "<label>" N_("When exporting from the Export dialog, you can choose objects to export. 'Save a copy' / 'Save as' will export all pages.") "</label>"
+                "<spacer size=\"5\" />"
+                "<label>" N_("The page bleed can be set with the Page tool.") "</label>"
+            "</vbox></hbox>"
+            "<output is_exported='true' priority='5'>\n"
+                "<extension>.pdf</extension>\n"
+                "<mimetype>application/pdf</mimetype>\n"
+                "<filetypename>Portable Document Format (*.pdf)</filetypename>\n"
+                "<filetypetooltip>PDF File</filetypetooltip>\n"
+            "</output>\n"
+        "</inkscape-extension>", new CairoRendererPdfOutput());
+    // clang-format on
+
+    return;
+}
+
+} } }  /* namespace Inkscape, Extension, Internal */
+
+#endif /* HAVE_CAIRO_PDF */