]> gitweb.michael.orlitzky.com - libsvgtiny-pixbuf.git/blobdiff - example.c
example.c: use transparent background.
[libsvgtiny-pixbuf.git] / example.c
index 74a66581f04bf04733795b8adc3ab9967a6c5da5..aa71e233cee108f95056f3d6d9edd18371c5fbb2 100644 (file)
--- a/example.c
+++ b/example.c
@@ -69,17 +69,19 @@ static void render_path(cairo_t* cr, shape_t* path) {
     }
   }
   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_set_source_rgba(cr,
+                         svgtiny_RED(path->fill) / 255.0,
+                         svgtiny_GREEN(path->fill) / 255.0,
+                         svgtiny_BLUE(path->fill) / 255.0,
+                         1);
     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_source_rgba(cr,
+                         svgtiny_RED(path->stroke) / 255.0,
+                         svgtiny_GREEN(path->stroke) / 255.0,
+                         svgtiny_BLUE(path->stroke) / 255.0,
+                         1);
     cairo_set_line_width(cr, path->stroke_width);
     cairo_stroke_preserve(cr);
   }
@@ -175,7 +177,7 @@ static cairo_t* cairo_context_from_diagram(diagram_t* diagram) {
   cairo_status_t crs;
   unsigned int i;
 
-  surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
+  surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
                                       diagram->width,
                                       diagram->height);
 
@@ -203,7 +205,7 @@ static cairo_t* cairo_context_from_diagram(diagram_t* diagram) {
     return NULL;
   }
 
-  cairo_set_source_rgb(cr, 1, 1, 1);
+  cairo_set_source_rgba(cr, 0, 0, 0, 0);
   cairo_paint(cr);
 
   /* Loop through the shapes in the diagram... */
@@ -218,10 +220,11 @@ static cairo_t* cairo_context_from_diagram(diagram_t* diagram) {
     if (diagram->shape[i].text) {
       /* Figure out what color to use from the R/G/B components of the
         shape's stroke. */
-      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_set_source_rgba(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,
+                           1);
       /* Then move to the actual position of the text within the
         shape... */
       cairo_move_to(cr,
@@ -284,18 +287,21 @@ int main(int argc, char** argv) {
     return 1;
   }
 
-  /* We're using the diagram width and height and not the viewport
-   * width/height for the image. This has the potential to create an
-   * image with a different size and aspect ratio than the viewport,
-   * but since our viewport is entirely made-up... I don't know. This
-   * relies on libsvgtiny being good at scaling/stretching/etc an SVG
-   * that may only have partial width/height/viewBox information.
+  /* We're using the viewport width and height and not the diagram
+   * width/height for the image. The diagram can be of a different
+   * size and aspect ratio than the viewport, and our main use case is
+   * for icons that are generally square and reasonably sized. If the
+   * diagram is "small," then we want to scale it up until it fits
+   * nicely in the viewport before rendering it. That's as opposed to
+   * rendering the image small, and letting GDK scale it up. Of course
+   * this reasoning makes the assumption that the viewport is usually
+   * larger than the diagram.
    */
   pb = gdk_pixbuf_get_from_surface(cairo_get_target(cr),
                                   0,
                                   0,
-                                  diagram->width,
-                                  diagram->height);
+                                  VIEWPORT_WIDTH,
+                                  VIEWPORT_HEIGHT);
 
 
   if (pb) {
@@ -305,3 +311,89 @@ int main(int argc, char** argv) {
 
   return 0;
 }
+
+
+static GdkPixbuf* gdk_pixbuf_from_svg_file_stream(FILE *fp, GError **error) {
+  diagram_t* diagram;
+  cairo_t* cr = 0;
+
+  GdkPixbuf* pb;
+
+  diagram = svgtiny_diagram_from_file(fp, VIEWPORT_WIDTH, VIEWPORT_HEIGHT);
+  if (!diagram) {
+    return NULL;
+  }
+
+  cr = cairo_context_from_diagram(diagram);
+  if (!cr) {
+    svgtiny_free(diagram);
+    return NULL;
+  }
+
+
+  /* We're using the viewport width and height and not the diagram
+   * width/height for the image. The diagram can be of a different
+   * size and aspect ratio than the viewport, and our main use case is
+   * for icons that are generally square and reasonably sized. If the
+   * diagram is "small," then we want to scale it up until it fits
+   * nicely in the viewport before rendering it. That's as opposed to
+   * rendering the image small, and letting GDK scale it up. Of course
+   * this reasoning makes the assumption that the viewport is usually
+   * larger than the diagram.
+  */
+  pb = gdk_pixbuf_get_from_surface(cairo_get_target(cr),
+                                  0,
+                                  0,
+                                  VIEWPORT_WIDTH,
+                                  VIEWPORT_HEIGHT);
+
+
+  if (!pb) {
+    fprintf(stderr, "gdk_pixbuf_get_from_surface failed!\n");
+  }
+
+  return pb;
+}
+
+
+G_MODULE_EXPORT void fill_vtable(GdkPixbufModule* module);
+void fill_vtable(GdkPixbufModule* module) {
+  module->load = gdk_pixbuf_from_svg_file_stream;
+}
+
+G_MODULE_EXPORT void fill_info(GdkPixbufFormat *info);
+void fill_info(GdkPixbufFormat* info) {
+  /* Borrowed from librsvg-2.40.21 */
+  static const GdkPixbufModulePattern signature[] = {
+    {  " <svg",  "*    ", 100 },
+    {  " <!DOCTYPE svg",  "*             ", 100 },
+    { NULL, NULL, 0 }
+  };
+
+  /* I'm not sure if we should support gzipped svg here? */
+  static const gchar *mime_types[] = {
+    "image/svg+xml",
+    "image/svg",
+    "image/svg-xml",
+    "image/vnd.adobe.svg+xml",
+    "text/xml-svg",
+    "image/svg+xml-compressed",
+    NULL
+  };
+
+  static const gchar *extensions[] = {
+    "svg",
+    "svgz",
+    "svg.gz",
+    NULL
+  };
+
+  info->name        = "svg";
+  info->signature   = (GdkPixbufModulePattern*) signature;
+  info->description = "Scalable Vector Graphics";
+  info->mime_types  = (gchar**) mime_types;
+  info->extensions  = (gchar**) extensions;
+  info->flags       = GDK_PIXBUF_FORMAT_SCALABLE;
+  info->license     = "AGPL3";
+}
+