[librsvg] Add rsvg_get_surface_of_node

[Christian Persch <chpe src gnome org>]

commit 0b8f017df3fe4d1975efad610f9afcce8a94f8e3
Author: Christian Persch <chpe gnome org>
Date:   Sat Nov 26 22:18:17 2011 +0100

    Add rsvg_get_surface_of_node
    
    Similar to rsvg_get_pixbuf_of_node except that it returns a cairo_surface_t.

 rsvg-base.c         |    6 ++++++
 rsvg-cairo-clip.c   |    1 +
 rsvg-cairo-draw.c   |   35 +++++++++++++++++++++++++++++++++++
 rsvg-cairo-draw.h   |    2 ++
 rsvg-cairo-render.c |    2 ++
 rsvg-private.h      |    4 +++-
 6 files changed, 49 insertions(+), 1 deletions(-)
---
diff --git a/rsvg-base.c b/rsvg-base.c
index d61789d..6618298 100644
--- a/rsvg-base.c
+++ b/rsvg-base.c
@@ -1974,6 +1974,12 @@ rsvg_get_image_of_node (RsvgDrawingCtx * ctx, RsvgNode * drawable, double w, dou
     return ctx->render->get_image_of_node (ctx, drawable, w, h);
 }
 
+cairo_surface_t *
+rsvg_get_surface_of_node (RsvgDrawingCtx * ctx, RsvgNode * drawable, double w, double h)
+{
+    return ctx->render->get_surface_of_node (ctx, drawable, w, h);
+}
+
 void
 rsvg_render_free (RsvgRender * render)
 {
diff --git a/rsvg-cairo-clip.c b/rsvg-cairo-clip.c
index 5f078d9..f634574 100644
--- a/rsvg-cairo-clip.c
+++ b/rsvg-cairo-clip.c
@@ -127,6 +127,7 @@ rsvg_cairo_clip_render_new (cairo_t * cr, RsvgCairoRender *parent)
     render->push_discrete_layer = rsvg_cairo_clip_push_discrete_layer;
     render->add_clipping_rect = rsvg_cairo_clip_add_clipping_rect;
     render->get_image_of_node = NULL;
+    render->get_surface_of_node = NULL;
     cairo_render->initial_cr = parent->cr;
     cairo_render->cr = cr;
     clip_render->parent = parent;
diff --git a/rsvg-cairo-draw.c b/rsvg-cairo-draw.c
index a086bde..2611f88 100644
--- a/rsvg-cairo-draw.c
+++ b/rsvg-cairo-draw.c
@@ -995,6 +995,41 @@ rsvg_cairo_get_image_of_node (RsvgDrawingCtx * ctx,
     return img;
 }
 
+cairo_surface_t *
+rsvg_cairo_get_surface_of_node (RsvgDrawingCtx *ctx,
+                                RsvgNode *drawable, 
+                                double width, 
+                                double height)
+{
+    cairo_surface_t *surface;
+    cairo_t *cr;
+
+    RsvgCairoRender *save_render = (RsvgCairoRender *) ctx->render;
+    RsvgCairoRender *render;
+
+    surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
+    if (cairo_surface_status (surface) != CAIRO_STATUS_SUCCESS) {
+        cairo_surface_destroy (surface);
+        return NULL;
+    }
+
+    cr = cairo_create (surface);
+
+    render = rsvg_cairo_render_new (cr, width, height);
+    ctx->render = (RsvgRender *) render;
+
+    rsvg_state_push (ctx);
+    rsvg_node_draw (drawable, ctx, 0);
+    rsvg_state_pop (ctx);
+
+    cairo_destroy (cr);
+
+    rsvg_render_free (ctx->render);
+    ctx->render = (RsvgRender *) save_render;
+
+    return surface;
+}
+
 void
 rsvg_cairo_to_pixbuf (guint8 * pixels, int rowstride, int height)
 {
diff --git a/rsvg-cairo-draw.h b/rsvg-cairo-draw.h
index c164498..1728d1c 100644
--- a/rsvg-cairo-draw.h
+++ b/rsvg-cairo-draw.h
@@ -46,6 +46,8 @@ void         rsvg_cairo_add_clipping_rect       (RsvgDrawingCtx *ctx,
 
 GdkPixbuf   *rsvg_cairo_get_image_of_node       (RsvgDrawingCtx *ctx, RsvgNode *drawable, 
                                                  double width, double height);
+cairo_surface_t*rsvg_cairo_get_surface_of_node  (RsvgDrawingCtx *ctx, RsvgNode *drawable, 
+                                                 double width, double height);
 
 void         rsvg_cairo_to_pixbuf           (guint8 * pixels, int rowstride, int height);
 void         rsvg_pixbuf_to_cairo           (guint8 * pixels, int rowstride, int height);
diff --git a/rsvg-cairo-render.c b/rsvg-cairo-render.c
index 8edf768..afbfb5f 100644
--- a/rsvg-cairo-render.c
+++ b/rsvg-cairo-render.c
@@ -32,6 +32,7 @@
 #include <string.h>
 
 #include "rsvg.h"
+#include "rsvg-private.h"
 #include "rsvg-cairo.h"
 #include "rsvg-cairo-draw.h"
 #include "rsvg-cairo-render.h"
@@ -63,6 +64,7 @@ rsvg_cairo_render_new (cairo_t * cr, double width, double height)
     cairo_render->super.push_discrete_layer = rsvg_cairo_push_discrete_layer;
     cairo_render->super.add_clipping_rect = rsvg_cairo_add_clipping_rect;
     cairo_render->super.get_image_of_node = rsvg_cairo_get_image_of_node;
+    cairo_render->super.get_surface_of_node = rsvg_cairo_get_surface_of_node;
     cairo_render->width = width;
     cairo_render->height = height;
     cairo_render->offset_x = 0;
diff --git a/rsvg-private.h b/rsvg-private.h
index c39d1e7..dee875f 100644
--- a/rsvg-private.h
+++ b/rsvg-private.h
@@ -224,6 +224,8 @@ struct RsvgRender {
                                                  double w, double h);
     GdkPixbuf       *(*get_image_of_node)       (RsvgDrawingCtx * ctx, RsvgNode * drawable,
                                                  double w, double h);
+    cairo_surface_t *(*get_surface_of_node)     (RsvgDrawingCtx * ctx, RsvgNode * drawable,
+                                                 double w, double h);
 };
 
 static inline RsvgRender *
@@ -379,7 +381,7 @@ void rsvg_render_image          (RsvgDrawingCtx * ctx, GdkPixbuf * pb,
 void rsvg_render_free           (RsvgRender * render);
 void rsvg_add_clipping_rect     (RsvgDrawingCtx * ctx, double x, double y, double w, double h);
 GdkPixbuf *rsvg_get_image_of_node (RsvgDrawingCtx * ctx, RsvgNode * drawable, double w, double h);
-
+cairo_surface_t *rsvg_get_surface_of_node (RsvgDrawingCtx * ctx, RsvgNode * drawable, double w, double h);
 
 void rsvg_node_set_atts (RsvgNode * node, RsvgHandle * ctx, RsvgPropertyBag * atts);