+#include <fcntl.h> /* open */
+#include <stdio.h> /* printf, fprintf */
+#include <stdlib.h> /* malloc */
+#include <sys/stat.h> /* fstat */
+#include <unistd.h> /* read */
+
#include <cairo.h>
-#include <stdio.h>
-#include <stdlib.h>
+#include <gdk/gdk.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
#include <svgtiny.h>
+/* Convenient typedefs for libsvgtiny */
+typedef struct svgtiny_diagram diagram_t;
+
+
/**
* Render an svgtiny path using cairo.
*/
-void render_path(cairo_t *cr, float scale, struct svgtiny_shape *path) {
+void render_path(cairo_t *cr, struct svgtiny_shape *path) {
unsigned int j;
cairo_new_path(cr);
switch ((int) path->path[j]) {
case svgtiny_PATH_MOVE:
cairo_move_to(cr,
- scale * path->path[j + 1],
- scale * path->path[j + 2]);
+ path->path[j + 1],
+ path->path[j + 2]);
j += 3;
break;
case svgtiny_PATH_CLOSE:
break;
case svgtiny_PATH_LINE:
cairo_line_to(cr,
- scale * path->path[j + 1],
- scale * path->path[j + 2]);
+ path->path[j + 1],
+ 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]);
+ path->path[j + 1],
+ path->path[j + 2],
+ path->path[j + 3],
+ path->path[j + 4],
+ path->path[j + 5],
+ path->path[j + 6]);
j += 7;
break;
default:
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_set_line_width(cr, path->stroke_width);
cairo_stroke_preserve(cr);
}
}
+/*
+ * @brief Parse an SVG file into a diagram_t structure.
+ *
+ * @param path
+ * The path to the SVG file.
+ *
+ * @return If successful, a pointer to a @c diagram_t structure is
+ * returned; if not, @c NULL is returned. You are expected to @c
+ * svgtiny_free the result if it is valid.
+ */
+diagram_t* svgtiny_diagram_from_path(char* path, int width, int height) {
+ diagram_t *diagram;
-int main(int argc, char** argv) {
- int exit_code = 0;
-
- /* Initial viewport width and height */
- int width = 1024, height = 1024;
- float scale = 1.0;
- char* svgpath = "Ghostscript_Tiger.svg";
- char* pngpath = "Ghostscript_Tiger.png";
- size_t svgsize = 68630;
-
- FILE *fd;
+ int fd;
+ size_t bytecount;
char *buffer;
size_t bytesread;
-
+ struct stat sb;
svgtiny_code code;
- struct svgtiny_diagram *diagram;
- cairo_surface_t *surface;
- cairo_t *cr = 0;
- cairo_status_t cr_status;
-
- unsigned int i;
/* load file into memory buffer */
- fd = fopen(svgpath, "rb");
- if (!fd) {
- perror(svgpath);
- return 1;
+ fd = open(path, O_RDONLY);
+ if (fd == -1) {
+ perror(path);
+ return NULL;
}
- buffer = malloc(svgsize);
+ if (fstat(fd, &sb)) {
+ perror(path);
+ return NULL;
+ }
+ bytecount = sb.st_size;
+
+ buffer = malloc(bytecount);
if (!buffer) {
- fprintf(stderr, "Unable to allocate %zd bytes\n", svgsize);
- return 1;
+ fprintf(stderr, "Unable to allocate %zd bytes\n", bytecount);
+ return NULL;
}
- bytesread = fread(buffer, 1, svgsize, fd);
- if (bytesread != svgsize) {
- perror(svgpath);
- return 1;
+ bytesread = read(fd, buffer, bytecount);
+ if (bytesread != bytecount) {
+ perror(path);
+ return NULL;
}
- fclose(fd);
+ close(fd);
/* create svgtiny object */
diagram = svgtiny_create();
if (!diagram) {
fprintf(stderr, "svgtiny_create() failed\n");
- return 1;
+ return NULL;
}
- code = svgtiny_parse(diagram, buffer, svgsize, svgpath, width, height);
+ code = svgtiny_parse(diagram, buffer, bytecount, path, width, height);
free(buffer);
if (code != svgtiny_OK) {
break;
}
fprintf(stderr, "\n");
- return 1;
+ return NULL;
}
+ return diagram;
+}
+
+/*
+ * @brief Create a cairo context from a libsvgtiny diagram.
+ *
+ * @param diagram
+ * A pointer to a valid libsvgtiny diagram.
+ *
+ * @return If successful, a pointer to a @c cairo_t context structure
+ * is returned; if not, @c NULL is returned. You are expected to @c
+ * cairo_destroy the result if it is valid.
+ */
+cairo_t* cairo_context_from_diagram(diagram_t* diagram) {
+ cairo_t* cr;
+ cairo_surface_t* surface;
+ cairo_status_t crs;
+ unsigned int i;
+
+ surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
+ diagram->width,
+ diagram->height);
- surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, height);
- if (!surface) {
- fprintf(stderr, "cairo_image_surface_create failed\n");
- exit_code = 1;
- goto cleanup;
+ crs = cairo_surface_status(surface);
+ if (crs != CAIRO_STATUS_SUCCESS) {
+ fprintf(stderr,
+ "cairo_image_surface_create failed: %s\n",
+ cairo_status_to_string(crs));
+ cairo_surface_destroy(surface);
+ return NULL;
}
cr = cairo_create(surface);
- cr_status = cairo_status(cr);
- if (cr_status != CAIRO_STATUS_SUCCESS) {
+ crs = cairo_status(cr);
+
+ /* Immediately destroy the surface which is now accessible as
+ cr->target */
+ cairo_surface_destroy(surface);
+
+ if (crs != CAIRO_STATUS_SUCCESS) {
fprintf(stderr,
"cairo_create failed: %s\n",
- cairo_status_to_string(cr_status));
- exit_code = 1;
- goto cleanup;
+ cairo_status_to_string(crs));
+ cairo_destroy(cr);
+ return NULL;
}
cairo_set_source_rgb(cr, 1, 1, 1);
/* If this shape is a path, just render it. */
if (diagram->shape[i].path) {
- render_path(cr, scale, &diagram->shape[i]);
+ render_path(cr, &diagram->shape[i]);
}
/* If this shape is text... */
/* Then move to the actual position of the text within the
shape... */
cairo_move_to(cr,
- scale * diagram->shape[i].text_x,
- scale * diagram->shape[i].text_y);
+ diagram->shape[i].text_x,
+ diagram->shape[i].text_y);
/* and draw it. */
cairo_show_text(cr, diagram->shape[i].text);
}
}
- /* Check the status again. */
- cr_status = cairo_status(cr);
- if (cr_status != CAIRO_STATUS_SUCCESS) {
- fprintf(stderr, "cairo error: %s\n",
- cairo_status_to_string(cr_status));
- exit_code = 1;
- goto cleanup;
+
+ /* Check the status again just for good measure? */
+ crs = cairo_status(cr);
+ if (crs != CAIRO_STATUS_SUCCESS) {
+ fprintf(stderr,
+ "cairo error: %s\n",
+ cairo_status_to_string(crs));
+ cairo_destroy(cr);
+ return NULL;
}
- cr_status = cairo_surface_write_to_png(surface, pngpath);
- if (cr_status != CAIRO_STATUS_SUCCESS) {
- fprintf(stderr, "cairo error: %s\n",
- cairo_status_to_string(cr_status));
- exit_code = 1;
- goto cleanup;
+ return cr;
+}
+
+int main(int argc, char** argv) {
+ char* svgpath;
+ char* pngpath;
+ int pngwidth = 1024, pngheight = 1024;
+
+ diagram_t* diagram;
+ cairo_t *cr = 0;
+
+ GdkPixbuf* pb;
+
+ /* Parse arguments, and maybe print usage */
+ if (argc < 3) {
+ printf("Usage: %s INPUT OUTPUT\n", argv[0]);
+ printf("Convert an SVG file (INPUT) to a PNG file (OUTPUT)\n");
+ return 2;
}
-cleanup:
- if (cr) {
- cairo_destroy(cr);
+ svgpath = argv[1];
+ pngpath = argv[2];
+
+ diagram = svgtiny_diagram_from_path(svgpath, pngwidth, pngheight);
+ if (!diagram) {
+ return 1;
+ }
+
+ cr = cairo_context_from_diagram(diagram);
+ if (!cr) {
+ svgtiny_free(diagram);
+ return 1;
+ }
+
+ pb = gdk_pixbuf_get_from_surface(cairo_get_target(cr),
+ 0,
+ 0,
+ pngwidth,
+ pngheight);
+
+
+ if (pb) {
+ gdk_pixbuf_save(pb, pngpath, "png", NULL, NULL);
+ g_object_unref(pb);
}
- cairo_surface_destroy(surface);
- svgtiny_free(diagram);
- return exit_code;
+ return 0;
}
projects / libsvgtiny-pixbuf.git / blobdiff