extension/internal/cairo-png-out.cpp

	cairo-png-out.cpp revision ddc1f1d1291eb21b244c7328d260c7d4a43be2fc
/*
 * A quick hack to use the Cairo renderer to write out a file.  This
 * then makes 'save as...' PNG.
 *
 * Authors:
 *   Ted Gould <ted@gould.cx>
 *   Ulf Erikson <ulferikson@users.sf.net>
 *
 * Copyright (C) 2004-2006 Authors
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#ifdef HAVE_CAIRO_PDF

#include "cairo-png-out.h"
#include "cairo-render-context.h"
#include "cairo-renderer.h"
#include <print.h>
#include "extension/system.h"
#include "extension/print.h"
#include "extension/db.h"
#include "extension/output.h"
#include "display/nr-arena.h"
#include "display/nr-arena-item.h"

#include "display/curve.h"
#include "display/canvas-bpath.h"
#include "sp-item.h"
#include "style.h"
#include "sp-root.h"
#include "sp-shape.h"

#include "io/sys.h"

namespace Inkscape {
namespace Extension {
namespace Internal {

bool
CairoRendererOutput::check (Inkscape::Extension::Extension * module)
{
    return TRUE;
}

static bool
png_render_document_to_file(SPDocument *doc, gchar const *filename)
{
    CairoRenderer *renderer;
    CairoRenderContext *ctx;

    sp_document_ensure_up_to_date(doc);

/* Start */
    /* Create new arena */
    SPItem *base = SP_ITEM(sp_document_root(doc));
    NRArena *arena = NRArena::create();
    unsigned dkey = sp_item_display_key_new(1);
    NRArenaItem *root = sp_item_invoke_show(base, arena, dkey, SP_ITEM_SHOW_DISPLAY);

    /* Create renderer and context */
    renderer = new CairoRenderer();
    ctx = renderer->createContext();

    /* Render document */
    bool ret = renderer->setupDocument(ctx, doc, TRUE, NULL);
    if (ret) {
        renderer->renderItem(ctx, base);
        ctx->saveAsPng(filename);
        ret = ctx->finish();
    }
    renderer->destroyContext(ctx);

    /* Release arena */
    sp_item_invoke_hide(base, dkey);
    nr_arena_item_unref(root);
    nr_object_unref((NRObject *) arena);
/* end */
    delete renderer;

    return ret;
}


/**
    \brief  This function calls the output module with the filename
    \param  mod   unused
    \param  doc   Document to be saved
    \param  uri   Filename to save to (probably will end in .png)
*/
void
CairoRendererOutput::save (Inkscape::Extension::Output *mod, SPDocument *doc, const gchar *uri)
{
    if (!png_render_document_to_file(doc, uri))
        throw Inkscape::Extension::Output::save_failed();

    return;
}

/**
    \brief   A function allocate a copy of this function.

    This is the definition of Cairo PNG out.  This function just
    calls the extension system with the memory allocated XML that
    describes the data.
*/
void
CairoRendererOutput::init (void)
{
    Inkscape::Extension::build_from_mem(
        "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
            "<name>Cairo PNG Output</name>\n"
            "<id>org.inkscape.output.png.cairo</id>\n"
            "<output>\n"
                "<extension>.png</extension>\n"
                "<mimetype>image/png</mimetype>\n"
                "<filetypename>Cairo PNG (*.png)</filetypename>\n"
                "<filetypetooltip>PNG File</filetypetooltip>\n"
            "</output>\n"
        "</inkscape-extension>", new CairoRendererOutput());

    return;
}

} } }  /* namespace Inkscape, Extension, Implementation */

#endif /* HAVE_CAIRO_PDF */