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authordeva <deva>2006-05-01 11:28:35 +0000
committerdeva <deva>2006-05-01 11:28:35 +0000
commit2bee772bed19a55f666d7106c02735f14c0084e4 (patch)
tree1b424406c33c43b0e4396eb4bb6fead19617b5ad /client/svgloader.cc
parent7694d644af9f6058d31db5dc75ef6aa860276d25 (diff)
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * svgloader.cc
+ *
+ * Mon May 1 11:03:39 CEST 2006
+ * Copyright 2006 Bent Bisballe Nyeng
+ * deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ * This file is part of MIaV.
+ *
+ * MIaV 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.
+ *
+ * MIaV 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 MIaV; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+#include "svgloader.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+#include <cairo.h>
+#include <svg.h>
+#include <svg-cairo.h>
+
+SVGLoader::SVGLoader()
+{
+}
+
+SVGLoader::~SVGLoader()
+{
+}
+
+/* load: This is what you're probably interested in!
+ * -----------------------------------------------------
+ * If width and height are greater than 0, the image will
+ * be scaled to that size. wscale and hscale would be ignored.
+ *
+ * If width and height are less than 1, wscale and hscale will
+ * resize the width and the height to the specified scales.
+ *
+ * If width and height are less than 1, and wscale and hscale
+ * are either 0 or 1, then the image will be loaded at it's
+ * natural size.
+ *
+ * See main() for examples.
+ */
+QImage SVGLoader::load(QString file, unsigned int width, unsigned int height, float wscale, float hscale) {
+ svg_cairo_t *scr;
+ int bpp;
+ int btpp;
+ unsigned int rwidth;
+ unsigned int rheight;
+
+ // Create the SVG cairo stuff.
+ svg_cairo_create(&scr);
+ svg_cairo_parse(scr, file.toStdString().c_str());
+
+ if (wscale <= 0) wscale=1;
+ if (hscale <= 0) hscale=1;
+
+ // Now get the width and height of the SVG content, so we can calculate
+ // and adjust our image dimensions
+ svg_cairo_get_size (scr, &rwidth, &rheight);
+
+ // Calculate final width and height of our surface based on the parameters passed
+ if (width > 0) {
+ if (rwidth>width) {
+ wscale=(float)width/(float)rwidth;
+ printf ("rwidth/width = %f\n", wscale);
+ } else {
+ wscale=(float)rwidth/(float)width;
+ printf ("width/wwidth = %f\n", wscale);
+ }
+ } else {
+ width=(int)(rwidth*wscale);
+ printf ("width = %i\n", width);
+ }
+ if (height > 0) {
+ if (rheight>height) {
+ hscale=(float)height/(float)rheight;
+ printf ("height/rheight = %f\n", hscale);
+ } else {
+ hscale=(float)rheight/(float)height;
+ printf ("rheight/height = %f\n", hscale);
+ }
+ } else {
+ height=(int)(rheight*hscale);
+ printf ("height = %i\n", height);
+ }
+
+ // We will create a CAIRO_FORMAT_ARGB32 surface. We don't need to match
+ // the screen SDL format, but we are interested in the alpha bit
+ bpp=32; // bits per pixel
+ btpp=4; // bytes per pixel
+
+ // scanline width
+ int stride=width * btpp;
+
+ // Allocate an image
+ unsigned char *image=(unsigned char*)calloc(stride*height, 1);
+
+ // Create the cairo surface with the adjusted width and height
+ cairo_surface_t *cairo_surface;
+ cairo_surface = cairo_image_surface_create_for_data(image, CAIRO_FORMAT_ARGB32,
+ width, height, stride);
+
+ cairo_t *cr = cairo_create(cairo_surface);
+ cairo_scale(cr, wscale, hscale);
+
+ // Render SVG to our surface
+ svg_cairo_render(scr, cr);
+
+ // Cleanup cairo
+ cairo_surface_destroy(cairo_surface);
+ cairo_destroy(cr);
+
+ // Destroy the svg_cairo structure
+ svg_cairo_destroy(scr);
+
+ // Create the QImage using the render buffer.
+ QImage qimage(image, width, height, QImage::Format_ARGB32);
+ return qimage;
+}