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authorJames Bursa <james@netsurf-browser.org>2010-01-10 21:08:17 (GMT)
committer James Bursa <james@netsurf-browser.org>2010-01-10 21:08:17 (GMT)
commit7d0c75c39fcddcfe477f58403fd3c95d5e4f873b (patch)
treef518231ffb1680e587fccc381f22281cf4884291
parent3b3a99208b438ebdfb42d1ee417fa156b7a62f8d (diff)
downloadlibsvgtiny-7d0c75c39fcddcfe477f58403fd3c95d5e4f873b.tar.gz
libsvgtiny-7d0c75c39fcddcfe477f58403fd3c95d5e4f873b.tar.bz2
Add an example of using libsvgtiny. Displays an SVG using X11 and cairo.
svn path=/trunk/libsvgtiny/; revision=9800
-rw-r--r--examples/svgtiny_display_x11.c444
1 files changed, 444 insertions, 0 deletions
diff --git a/examples/svgtiny_display_x11.c b/examples/svgtiny_display_x11.c
new file mode 100644
index 0000000..d10bfbc
--- a/dev/null
+++ b/examples/svgtiny_display_x11.c
@@ -0,0 +1,444 @@
+/*
+ * This file is part of Libsvgtiny
+ * Licensed under the MIT License,
+ * http://opensource.org/licenses/mit-license.php
+ * Copyright 2009-2010 James Bursa <james@semichrome.net>
+ */
+
+/*
+ * This example loads an SVG using libsvgtiny and then displays it in an X11
+ * window using cairo.
+ *
+ * Functions of interest for libsvgtiny use are:
+ * main() - loads an SVG using svgtiny_create() and svgtiny_parse()
+ * event_diagram_expose() - renders the SVG by stepping through the shapes
+ *
+ * Compile using:
+ * gcc -g -W -Wall -o svgtiny_display_x11 svgtiny_display_x11.c \
+ * `pkg-config --cflags --libs libsvgtiny cairo` -lX11
+ */
+
+
+#include <libgen.h>
+#include <math.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <X11/Xlib.h>
+#include <X11/keysym.h>
+#include <cairo.h>
+#include <cairo-xlib.h>
+#include "svgtiny.h"
+
+
+struct svgtiny_diagram *diagram;
+Display *display;
+Window diagram_window;
+Atom wm_protocols_atom, wm_delete_window_atom;
+char *svg_path;
+float scale = 1.0;
+bool quit = false;
+
+
+void gui_init(void);
+void gui_quit(void);
+void update_window_title(void);
+void gui_poll(void);
+void event_diagram_key_press(XKeyEvent *key_event);
+void event_diagram_expose(const XExposeEvent *expose_event);
+void render_path(cairo_t *cr, float scale, struct svgtiny_shape *path);
+void die(const char *message);
+
+
+/**
+ * Main program.
+ */
+int main(int argc, char *argv[])
+{
+ FILE *fd;
+ struct stat sb;
+ char *buffer;
+ size_t size;
+ size_t n;
+ svgtiny_code code;
+
+ if (argc != 2) {
+ fprintf(stderr, "Usage: %s FILE\n", argv[0]);
+ return 1;
+ }
+ svg_path = argv[1];
+
+ /* load file into memory buffer */
+ fd = fopen(svg_path, "rb");
+ if (!fd) {
+ perror(svg_path);
+ return 1;
+ }
+
+ if (stat(svg_path, &sb)) {
+ perror(svg_path);
+ return 1;
+ }
+ size = sb.st_size;
+
+ buffer = malloc(size);
+ if (!buffer) {
+ fprintf(stderr, "Unable to allocate %lld bytes\n",
+ (long long) size);
+ return 1;
+ }
+
+ n = fread(buffer, 1, size, fd);
+ if (n != size) {
+ perror(svg_path);
+ return 1;
+ }
+
+ fclose(fd);
+
+ /* create svgtiny object */
+ diagram = svgtiny_create();
+ if (!diagram) {
+ fprintf(stderr, "svgtiny_create failed\n");
+ return 1;
+ }
+
+ /* parse */
+ code = svgtiny_parse(diagram, buffer, size, svg_path, 1000, 1000);
+ if (code != svgtiny_OK) {
+ fprintf(stderr, "svgtiny_parse failed: ");
+ switch (code) {
+ case svgtiny_OUT_OF_MEMORY:
+ fprintf(stderr, "svgtiny_OUT_OF_MEMORY");
+ break;
+ case svgtiny_LIBXML_ERROR:
+ fprintf(stderr, "svgtiny_LIBXML_ERROR");
+ break;
+ case svgtiny_NOT_SVG:
+ fprintf(stderr, "svgtiny_NOT_SVG");
+ break;
+ case svgtiny_SVG_ERROR:
+ fprintf(stderr, "svgtiny_SVG_ERROR: line %i: %s",
+ diagram->error_line,
+ diagram->error_message);
+ break;
+ default:
+ fprintf(stderr, "unknown svgtiny_code %i", code);
+ break;
+ }
+ fprintf(stderr, "\n");
+ }
+
+ free(buffer);
+
+ /*printf("viewbox 0 0 %u %u\n",
+ diagram->width, diagram->height);*/
+
+ gui_init();
+
+ while (!quit) {
+ gui_poll();
+ }
+
+ gui_quit();
+ svgtiny_free(diagram);
+
+ return 0;
+}
+
+
+/**
+ * Initialize X11 interface.
+ */
+void gui_init(void)
+{
+ display = XOpenDisplay(NULL);
+ if (!display)
+ die("XOpenDisplay failed: is DISPLAY set?");
+
+ diagram_window = XCreateSimpleWindow(display,
+ DefaultRootWindow(display),
+ 0, 0, diagram->width, diagram->height, 0, 0, 0);
+
+ update_window_title();
+
+ XMapWindow(display, diagram_window);
+ XSelectInput(display, diagram_window,
+ KeyPressMask |
+ ButtonPressMask |
+ ExposureMask |
+ StructureNotifyMask);
+
+ wm_protocols_atom = XInternAtom(display, "WM_PROTOCOLS", False);
+ wm_delete_window_atom = XInternAtom(display, "WM_DELETE_WINDOW", False);
+ XSetWMProtocols(display, diagram_window, &wm_delete_window_atom, 1);
+}
+
+
+/**
+ * Free X11 interface.
+ */
+void gui_quit(void)
+{
+ XCloseDisplay(display);
+}
+
+
+/**
+ * Update window title to show current state.
+ */
+void update_window_title(void)
+{
+ char title[100];
+ char *svg_path_copy;
+ char *base_name;
+
+ svg_path_copy = strdup(svg_path);
+ if (!svg_path_copy) {
+ fprintf(stderr, "out of memory\n");
+ return;
+ }
+
+ base_name = basename(svg_path_copy);
+
+ snprintf(title, sizeof title, "%s (%i%%) - svgtiny",
+ base_name, (int) roundf(scale * 100.0));
+
+ XStoreName(display, diagram_window, title);
+
+ free(svg_path_copy);
+}
+
+
+/**
+ * Handle an X11 event.
+ */
+void gui_poll(void)
+{
+ XEvent event;
+ XNextEvent(display, &event);
+
+ switch (event.type) {
+ case KeyPress:
+ if (event.xkey.window == diagram_window) {
+ event_diagram_key_press(&event.xkey);
+ }
+ break;
+ case Expose:
+ if (event.xexpose.window == diagram_window) {
+ event_diagram_expose(&event.xexpose);
+ }
+ break;
+ case ClientMessage:
+ if (event.xclient.message_type == wm_protocols_atom &&
+ event.xclient.format == 32 &&
+ (Atom) event.xclient.data.l[0] ==
+ wm_delete_window_atom)
+ quit = true;
+ break;
+ default:
+ /*printf("unknown event %i\n", event.type);*/
+ break;
+ }
+}
+
+
+/**
+ * Handle an X11 KeyPress event in the diagram window.
+ */
+void event_diagram_key_press(XKeyEvent *key_event)
+{
+ KeySym key_sym;
+ float new_scale = scale;
+ unsigned int width, height;
+
+ key_sym = XLookupKeysym(key_event, 0);
+
+ switch (key_sym) {
+ case XK_q:
+ case XK_Escape:
+ quit = true;
+ break;
+
+ case XK_minus:
+ case XK_KP_Subtract:
+ new_scale -= 0.1;
+ break;
+
+ case XK_equal:
+ case XK_plus:
+ case XK_KP_Add:
+ new_scale += 0.1;
+ break;
+
+ case XK_1:
+ case XK_KP_Multiply:
+ case XK_KP_1:
+ new_scale = 1;
+ break;
+
+ case XK_2:
+ case XK_KP_2:
+ new_scale = 2;
+ break;
+
+ default:
+ break;
+ }
+
+ if (new_scale < 0.1)
+ new_scale = 0.1;
+ else if (5 < new_scale)
+ new_scale = 5;
+
+ if (new_scale == scale)
+ return;
+
+ scale = new_scale;
+ width = diagram->width * scale;
+ height = diagram->height * scale;
+ if (width < 400)
+ width = 400;
+ if (height < 400)
+ height = 400;
+ XResizeWindow(display, diagram_window, width, height);
+ XClearArea(display, diagram_window, 0, 0, 0, 0, True);
+ update_window_title();
+}
+
+
+/**
+ * Handle an X11 Expose event of the diagram window.
+ */
+void event_diagram_expose(const XExposeEvent *expose_event)
+{
+ cairo_surface_t *surface;
+ cairo_t *cr;
+ cairo_status_t status;
+ unsigned int i;
+
+ if (expose_event->count != 0)
+ return;
+
+ surface = cairo_xlib_surface_create(display, diagram_window,
+ DefaultVisual(display, DefaultScreen(display)),
+ diagram->width * scale, diagram->height * scale);
+ if (!surface) {
+ fprintf(stderr, "cairo_xlib_surface_create failed\n");
+ return;
+ }
+
+ cr = cairo_create(surface);
+ status = cairo_status(cr);
+ if (status != CAIRO_STATUS_SUCCESS) {
+ fprintf(stderr, "cairo_create failed: %s\n",
+ cairo_status_to_string(status));
+ cairo_destroy(cr);
+ cairo_surface_destroy(surface);
+ return;
+ }
+
+ cairo_set_source_rgb(cr, 1, 1, 1);
+ cairo_paint(cr);
+
+ for (i = 0; i != diagram->shape_count; i++) {
+ if (diagram->shape[i].path) {
+ render_path(cr, scale, &diagram->shape[i]);
+
+ } else if (diagram->shape[i].text) {
+ cairo_set_source_rgb(cr,
+ svgtiny_RED(diagram->shape[i].stroke) / 255.0,
+ svgtiny_GREEN(diagram->shape[i].stroke) / 255.0,
+ svgtiny_BLUE(diagram->shape[i].stroke) / 255.0);
+ cairo_move_to(cr,
+ scale * diagram->shape[i].text_x,
+ scale * diagram->shape[i].text_y);
+ cairo_show_text(cr, diagram->shape[i].text);
+ }
+ }
+
+ status = cairo_status(cr);
+ if (status != CAIRO_STATUS_SUCCESS) {
+ fprintf(stderr, "cairo error: %s\n",
+ cairo_status_to_string(status));
+ cairo_destroy(cr);
+ cairo_surface_destroy(surface);
+ return;
+ }
+
+ cairo_destroy(cr);
+ cairo_surface_destroy(surface);
+}
+
+
+/**
+ * Render an svgtiny path using cairo.
+ */
+void render_path(cairo_t *cr, float scale, struct svgtiny_shape *path)
+{
+ unsigned int j;
+
+ cairo_new_path(cr);
+ for (j = 0; j != path->path_length; ) {
+ switch ((int) path->path[j]) {
+ case svgtiny_PATH_MOVE:
+ cairo_move_to(cr,
+ scale * path->path[j + 1],
+ scale * path->path[j + 2]);
+ j += 3;
+ break;
+ case svgtiny_PATH_CLOSE:
+ cairo_close_path(cr);
+ j += 1;
+ break;
+ case svgtiny_PATH_LINE:
+ cairo_line_to(cr,
+ scale * path->path[j + 1],
+ scale * path->path[j + 2]);
+ j += 3;
+ break;
+ case svgtiny_PATH_BEZIER:
+ cairo_curve_to(cr,
+ scale * path->path[j + 1],
+ scale * path->path[j + 2],
+ scale * path->path[j + 3],
+ scale * path->path[j + 4],
+ scale * path->path[j + 5],
+ scale * path->path[j + 6]);
+ j += 7;
+ break;
+ default:
+ printf("error ");
+ j += 1;
+ }
+ }
+ if (path->fill != svgtiny_TRANSPARENT) {
+ cairo_set_source_rgb(cr,
+ svgtiny_RED(path->fill) / 255.0,
+ svgtiny_GREEN(path->fill) / 255.0,
+ svgtiny_BLUE(path->fill) / 255.0);
+ cairo_fill_preserve(cr);
+ }
+ if (path->stroke != svgtiny_TRANSPARENT) {
+ cairo_set_source_rgb(cr,
+ svgtiny_RED(path->stroke) / 255.0,
+ svgtiny_GREEN(path->stroke) / 255.0,
+ svgtiny_BLUE(path->stroke) / 255.0);
+ cairo_set_line_width(cr, scale * path->stroke_width);
+ cairo_stroke_preserve(cr);
+ }
+}
+
+
+/**
+ * Exit with fatal error.
+ */
+void die(const char *message)
+{
+ fprintf(stderr, "%s\n", message);
+ exit(1);
+}
+