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rendernode-tool: Add another magic format

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Make .svg use the Cairo renderer to save to an SVG file.

It's useful when comparing rendering behavior and times with
web browsers (as long as one is aware that browsers build a full
DOM tree out of those SVGs).
This commit is contained in:
Benjamin Otte 2023-07-30 20:00:34 +02:00
parent 166777dd55
commit 3f16f7e0d4
1 changed files with 88 additions and 17 deletions
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105
tools/gtk-rendernode-tool-render.c
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@ -28,6 +28,9 @@
#include <glib/gstdio.h>
#include <gtk/gtk.h>
#include "gtk-rendernode-tool.h"
#ifdef CAIRO_HAS_SVG_SURFACE
#include <cairo-svg.h>
#endif
static char *
get_save_filename (const char *filename)
@ -48,6 +51,58 @@ get_save_filename (const char *filename)
return result;
}
#ifdef CAIRO_HAS_SVG_SURFACE
static cairo_status_t
cairo_serializer_write (gpointer user_data,
const unsigned char *data,
unsigned int length)
{
g_byte_array_append (user_data, data, length);
return CAIRO_STATUS_SUCCESS;
}
static GBytes *
create_svg (GskRenderNode *node,
GError **error)
{
cairo_surface_t *surface;
cairo_t *cr;
graphene_rect_t bounds;
GByteArray *array;
gsk_render_node_get_bounds (node, &bounds);
array = g_byte_array_new ();
surface = cairo_svg_surface_create_for_stream (cairo_serializer_write,
array,
bounds.size.width,
bounds.size.height);
cairo_svg_surface_set_document_unit (surface, CAIRO_SVG_UNIT_PX);
cairo_surface_set_device_offset (surface, -bounds.origin.x, -bounds.origin.y);
cr = cairo_create (surface);
gsk_render_node_draw (node, cr);
cairo_destroy (cr);
cairo_surface_finish (surface);
if (cairo_surface_status (surface) == CAIRO_STATUS_SUCCESS)
{
cairo_surface_destroy (surface);
return g_byte_array_free_to_bytes (array);
}
else
{
g_set_error (error,
G_IO_ERROR, G_IO_ERROR_FAILED,
"%s", cairo_status_to_string (cairo_surface_status (surface)));
cairo_surface_destroy (surface);
g_byte_array_unref (array);
return NULL;
}
}
#endif
static void
render_file (const char *filename,
const char *renderer_name,
@ -55,10 +110,7 @@ render_file (const char *filename,
{
GskRenderNode *node;
GBytes *bytes;
GdkTexture *texture;
char *save_to;
GskRenderer *renderer;
GdkSurface *window;
GError *error = NULL;
save_to = (char *) save_file;
@ -76,20 +128,40 @@ render_file (const char *filename,
node = load_node_file (filename);
if (renderer_name)
g_object_set_data_full (G_OBJECT (gdk_display_get_default ()), "gsk-renderer",
g_strdup (renderer_name), g_free);
window = gdk_surface_new_toplevel (gdk_display_get_default ());
renderer = gsk_renderer_new_for_surface (window);
texture = gsk_renderer_render_texture (renderer, node, NULL);
if (g_str_has_suffix (save_to, ".tif") ||
g_str_has_suffix (save_to, ".tiff"))
bytes = gdk_texture_save_to_tiff_bytes (texture);
#ifdef CAIRO_HAS_SVG_SURFACE
if (g_str_has_suffix (save_to, ".svg"))
{
bytes = create_svg (node, &error);
if (bytes == NULL)
{
g_printerr (_("Failed to generate SVG: %s\n"), error->message);
exit (1);
}
}
else
bytes = gdk_texture_save_to_png_bytes (texture);
#endif
{
GdkTexture *texture;
GskRenderer *renderer;
GdkSurface *window;
if (renderer_name)
g_object_set_data_full (G_OBJECT (gdk_display_get_default ()), "gsk-renderer",
g_strdup (renderer_name), g_free);
window = gdk_surface_new_toplevel (gdk_display_get_default ());
renderer = gsk_renderer_new_for_surface (window);
texture = gsk_renderer_render_texture (renderer, node, NULL);
if (g_str_has_suffix (save_to, ".tif") ||
g_str_has_suffix (save_to, ".tiff"))
bytes = gdk_texture_save_to_tiff_bytes (texture);
else
bytes = gdk_texture_save_to_png_bytes (texture);
g_object_unref (texture);
}
if (g_file_set_contents (save_to,
g_bytes_get_data (bytes, NULL),
@ -110,7 +182,6 @@ render_file (const char *filename,
if (save_to != save_file)
g_free (save_to);
g_object_unref (texture);
gsk_render_node_unref (node);
}