exportimage.c

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/*
 * gEDA - GNU Electronic Design Automation
 * This file is a part of gerbv.
 *
 *   Copyright (C) 2000-2002 Stefan Petersen (spe@stacken.kth.se)
 *
 * Contributed by Dino Ghilardi <dino.ghilardi@ieee.org> 
 *
 * $Id$
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA
 */

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

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include <math.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <png.h>

#include "gerbv.h"

#ifdef RENDER_USING_GDK
  #include "draw-gdk.h"
#else
  #include "draw.h"
  #include <cairo.h>
  #include <cairo-pdf.h>
  #include <cairo-ps.h>
  #include <cairo-svg.h>
#endif

extern gerbv_render_info_t screenRenderInfo;

#ifdef RENDER_USING_GDK
static gboolean 
exportimage_save_pixbuf_to_file (GdkPixbuf* pixbuf, gchar const* filename);
#endif

#ifndef RENDER_USING_GDK
void exportimage_render_to_surface_and_destroy (gerbv_project_t *gerbvProject,
              cairo_surface_t *cSurface, gerbv_render_info_t *renderInfo, gchar const* filename) {
      cairo_t *cairoTarget = cairo_create (cSurface);
      
      gerbv_render_all_layers_to_cairo_target_for_vector_output (gerbvProject, cairoTarget, renderInfo);
       cairo_destroy (cairoTarget);
       cairo_surface_destroy (cSurface);
}
#endif


void gerbv_export_png_file_from_project_autoscaled (gerbv_project_t *gerbvProject, int widthInPixels,
              int heightInPixels, gchar const* filename) {
#ifdef EXPORT_PNG
#ifdef RENDER_USING_GDK
       gerbv_render_info_t renderInfo = {1.0, 1.0, 0, 0, 0, widthInPixels, heightInPixels};
#else
       gerbv_render_info_t renderInfo = {1.0, 1.0, 0, 0, 3, widthInPixels, heightInPixels};
#endif 
       gerbv_render_zoom_to_fit_display (gerbvProject, &renderInfo);
       gerbv_export_png_file_from_project (gerbvProject, &renderInfo, filename);
#endif
}

void gerbv_export_png_file_from_project (gerbv_project_t *gerbvProject, gerbv_render_info_t *renderInfo, gchar const* filename) {
#ifdef EXPORT_PNG
#ifdef RENDER_USING_GDK

       GdkPixmap *renderedPixmap = gdk_pixmap_new (NULL, renderInfo->displayWidth,
                                                        renderInfo->displayHeight, 24);
       GdkColormap *colormap=NULL;
       GdkPixbuf *tempPixbuf=NULL;
       
       gerbv_render_to_pixmap_using_gdk (gerbvProject, renderedPixmap, renderInfo, NULL, NULL);
       colormap = gdk_drawable_get_colormap(renderedPixmap);
       if ((tempPixbuf = gdk_pixbuf_get_from_drawable(tempPixbuf, renderedPixmap, 
                                         colormap, 0, 0, 0, 0, 
                                         renderInfo->displayWidth, renderInfo->displayHeight))) {
              exportimage_save_pixbuf_to_file (tempPixbuf, filename);
              gdk_pixbuf_unref(tempPixbuf);
       }
       gdk_pixmap_unref(renderedPixmap);
       
       //png_export (NULL, filename);
#else
       cairo_surface_t *cSurface = cairo_image_surface_create  (CAIRO_FORMAT_ARGB32,
                                                         renderInfo->displayWidth, renderInfo->displayHeight);
       cairo_t *cairoTarget = cairo_create (cSurface);
       gerbv_render_all_layers_to_cairo_target (gerbvProject, cairoTarget, renderInfo);
       cairo_surface_write_to_png (cSurface, filename);
       cairo_destroy (cairoTarget);
       cairo_surface_destroy (cSurface);
#endif
#endif
}


void gerbv_export_pdf_file_from_project_autoscaled (gerbv_project_t *gerbvProject, int widthInPoints,
              int heightInPoints, gchar const* filename) {
       gerbv_render_info_t renderInfo = {1.0, 1.0, 0, 0, 3, widthInPoints, heightInPoints};
       
       gerbv_render_zoom_to_fit_display (gerbvProject, &renderInfo);
       gerbv_export_pdf_file_from_project (gerbvProject, &renderInfo, filename);
}

void gerbv_export_pdf_file_from_project (gerbv_project_t *gerbvProject, gerbv_render_info_t *renderInfo,
              gchar const* filename) {
#ifndef RENDER_USING_GDK
       cairo_surface_t *cSurface = cairo_pdf_surface_create (filename, renderInfo->displayWidth,
                                                        renderInfo->displayHeight);

      exportimage_render_to_surface_and_destroy (gerbvProject, cSurface, renderInfo, filename);
#endif
}

void gerbv_export_postscript_file_from_project_autoscaled (gerbv_project_t *gerbvProject, int widthInPoints,
              int heightInPoints, gchar const* filename) {
       gerbv_render_info_t renderInfo = {1.0, 1.0, 0, 0, 3, widthInPoints, heightInPoints};
       
       gerbv_render_zoom_to_fit_display (gerbvProject, &renderInfo);
       gerbv_export_postscript_file_from_project (gerbvProject, &renderInfo, filename);
}

void gerbv_export_postscript_file_from_project (gerbv_project_t *gerbvProject, gerbv_render_info_t *renderInfo,
              gchar const* filename) {
#ifndef RENDER_USING_GDK
       cairo_surface_t *cSurface = cairo_ps_surface_create (filename, renderInfo->displayWidth,
                                                        renderInfo->displayHeight);
      exportimage_render_to_surface_and_destroy (gerbvProject, cSurface, renderInfo, filename);
#endif
}

void gerbv_export_svg_file_from_project_autoscaled (gerbv_project_t *gerbvProject, int widthInPoints,
              int heightInPoints, gchar const* filename) {
       gerbv_render_info_t renderInfo = {1.0, 1.0, 0, 0, 3, widthInPoints, heightInPoints};
       
       gerbv_render_zoom_to_fit_display (gerbvProject, &renderInfo);
       gerbv_export_svg_file_from_project (gerbvProject, &renderInfo, filename);
}

void gerbv_export_svg_file_from_project (gerbv_project_t *gerbvProject, gerbv_render_info_t *renderInfo,
              gchar const* filename) {
#ifndef RENDER_USING_GDK
       cairo_surface_t *cSurface = cairo_svg_surface_create (filename, renderInfo->displayWidth,
                                                        renderInfo->displayHeight);
      exportimage_render_to_surface_and_destroy (gerbvProject, cSurface, renderInfo, filename);
#endif
}

#ifdef EXPORT_PNG
#ifdef RENDER_USING_GDK
static gboolean 
exportimage_save_pixbuf_to_file (GdkPixbuf *pixbuf, gchar const* filename)
{
       FILE *handle;
       int width, height, depth, rowstride;
       guchar *pixels;
       png_structp png_ptr;
       png_infop info_ptr;
       png_text text[2];
       png_byte **row_ptr;
       int i;

       g_return_val_if_fail (pixbuf != NULL, FALSE);
       g_return_val_if_fail (filename != NULL, FALSE);
       g_return_val_if_fail (filename[0] != '\0', FALSE);

        handle = fopen (filename, "wb");
        if (handle == NULL) {
           return FALSE;
       }

       png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
       if (png_ptr == NULL) {
           fclose (handle);
           return FALSE;
       }

       info_ptr = png_create_info_struct (png_ptr);
       if (info_ptr == NULL) {
           png_destroy_write_struct (&png_ptr, (png_infopp)NULL);
           fclose (handle);
           return FALSE;
       }

       png_init_io (png_ptr, handle);
       
       width = gdk_pixbuf_get_width (pixbuf);
       height = gdk_pixbuf_get_height (pixbuf);
       depth = gdk_pixbuf_get_bits_per_sample (pixbuf);
       pixels = gdk_pixbuf_get_pixels (pixbuf);
       rowstride = gdk_pixbuf_get_rowstride (pixbuf);
       
       png_set_IHDR (png_ptr, info_ptr, width, height,
                    depth, PNG_COLOR_TYPE_RGB,
                    PNG_INTERLACE_NONE,
                    PNG_COMPRESSION_TYPE_DEFAULT,
                    PNG_FILTER_TYPE_DEFAULT);
       
       /* Some text to go with the png image */
       text[0].key = "Title";
       text[0].text = g_strdup(filename);
       text[0].compression = PNG_TEXT_COMPRESSION_NONE;
       text[1].key = "Generator";
       text[1].text = "gerbv";
       text[1].compression = PNG_TEXT_COMPRESSION_NONE;
       png_set_text (png_ptr, info_ptr, text, 2);
       g_free (text[0].text);
       /* Write header data */
       png_write_info (png_ptr, info_ptr);
       
       /* Build up a vector of row pointers */   
       row_ptr = (png_byte **)g_malloc(height * sizeof(png_byte *));
       for (i = 0; i < height; i++) {
           row_ptr[i] = (png_byte *)pixels;
           pixels += rowstride;
       }

       /* Write it and free the row vector */
       png_write_image(png_ptr, row_ptr);
       g_free(row_ptr);

       /* Finish of PNG writing */
       png_write_end (png_ptr, info_ptr);
       png_destroy_write_struct (&png_ptr, &info_ptr);
       
       fclose (handle);
       return TRUE;
} /* pixbuf_to_file_as_png */
#endif
#endif