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- /* Example code to show how to use pangocairo to render arbitrary shapes
- * inside a text layout, positioned by Pango. This has become possibly
- * using the following API added in Pango 1.18:
- *
- * pango_cairo_context_set_shape_renderer ()
- *
- * This examples uses a small parser to convert shapes in the format of
- * SVG paths to cairo instructions. You can typically extract these from
- * the SVG file's <path> elements directly.
- *
- * The code then searches for the Unicode bullet character in the layout
- * text and automatically adds PangoAttribtues to the layout to replace
- * each of the with a rendering of the GNOME Foot logo.
- *
- *
- * Written by Behdad Esfahbod, 2007
- *
- * Permission to use, copy, modify, distribute, and sell this example
- * for any purpose is hereby granted without fee.
- * It is provided "as is" without express or implied warranty.
- */
- #include <stdio.h>
- #include <string.h>
- #include <pango/pangocairo.h>
- #define BULLET "*"
- const char text[] =
- "The GNOME project provides two things:\n"
- "\n"
- " * The \x28\x20\xCD\xA1\xC2\xB0\x20\xCD\x9C\xCA\x96\x20\xCD\xA1\xC2\xB0\x29 desktop environment\n"
- " * The \xD9\xA9\xE0\xB9\x8F\xCC\xAF\xCD\xA1\xE0\xB9\x8F\x29\xDB\xB6 development platform\n"
- " * Planet \x28\xE2\x98\x9E\xEF\xBE\x9F\xE3\x83\xAE\xEF\xBE\x9F\x29\xE2\x98\x9E \xF0\x9F\x99\x8F";
- typedef struct {
- double width, height;
- const char *path;
- } MiniSvg;
- static MiniSvg GnomeFootLogo = {
- 96.2152, 118.26,
- "M 86.068,1 C 61.466,0 56.851,35.041 70.691,35.041 C 84.529,35.041 110.671,0 86.068,0 z "
- "M 45.217,30.699 C 52.586,31.149 60.671,2.577 46.821,4.374 C 32.976,6.171 37.845,30.249 45.217,30.699 z "
- "M 11.445,48.453 C 16.686,46.146 12.12,23.581 3.208,29.735 C -5.7,35.89 6.204,50.759 11.445,48.453 z "
- "M 26.212,36.642 C 32.451,35.37 32.793,9.778 21.667,14.369 C 10.539,18.961 19.978,37.916 26.212,36.642 L 26.212,36.642 z "
- "M 58.791,93.913 C 59.898,102.367 52.589,106.542 45.431,101.092 C 22.644,83.743 83.16,75.088 79.171,51.386 C 75.86,31.712 15.495,37.769 8.621,68.553 C 3.968,89.374 27.774,118.26 52.614,118.26 C 64.834,118.26 78.929,107.226 81.566,93.248 C 83.58,82.589 57.867,86.86 58.791,93.913 L 58.791,93.913 z "
- "\0"
- };
- static void
- mini_svg_render (MiniSvg *shape,
- cairo_t *cr,
- gboolean do_path)
- {
- double x, y;
- const char *p;
- char op[2];
- int len;
- cairo_get_current_point (cr, &x, &y);
- cairo_translate (cr, x, y);
- for (p = shape->path; sscanf (p, "%1s %n", op, &len), p += len, *p;)
- switch (*op)
- {
- case 'M':
- {
- sscanf (p, "%lf,%lf %n", &x, &y, &len); p += len;
- cairo_move_to (cr, x, y);
- break;
- }
- case 'L':
- {
- sscanf (p, "%lf,%lf %n", &x, &y, &len); p += len;
- cairo_line_to (cr, x, y);
- break;
- }
- case 'C':
- {
- double x1, y1, x2, y2, x3, y3;
- sscanf (p, "%lf,%lf %lf,%lf %lf,%lf %n", &x1, &y1, &x2, &y2, &x3, &y3, &len); p += len;
- cairo_curve_to (cr, x1, y1, x2, y2, x3, y3);
- break;
- }
- case 'z':
- {
- cairo_close_path (cr);
- break;
- }
- default:
- {
- //g_warning ("Invalid MiniSvg operation '%c'", *op);
- break;
- }
- }
- if (!do_path)
- cairo_fill (cr);
- }
- static void
- mini_svg_shape_renderer (cairo_t *cr,
- PangoAttrShape *attr,
- gboolean do_path,
- gpointer data G_GNUC_UNUSED)
- {
- MiniSvg *shape = (MiniSvg *) attr->data;
- double scale_x, scale_y;
- scale_x = (double) attr->ink_rect.width / (PANGO_SCALE * shape->width );
- scale_y = (double) attr->ink_rect.height / (PANGO_SCALE * shape->height);
- cairo_rel_move_to (cr,
- (double) attr->ink_rect.x / PANGO_SCALE,
- (double) attr->ink_rect.y / PANGO_SCALE);
- cairo_scale (cr, scale_x, scale_y);
- mini_svg_render (shape, cr, do_path);
- }
- static PangoLayout *
- get_layout (cairo_t *cr)
- {
- PangoLayout *layout;
- PangoAttrList *attrs;
- PangoRectangle ink_rect = {1 * PANGO_SCALE, -11 * PANGO_SCALE, 8 * PANGO_SCALE, 10 * PANGO_SCALE};
- PangoRectangle logical_rect = {0 * PANGO_SCALE, -12 * PANGO_SCALE, 10 * PANGO_SCALE, 12 * PANGO_SCALE};
- const char *p;
- /* Create a PangoLayout, set the font and text */
- layout = pango_cairo_create_layout (cr);
- pango_cairo_context_set_shape_renderer (pango_layout_get_context (layout),
- mini_svg_shape_renderer, NULL, NULL);
- pango_layout_set_text (layout, text, -1);
- attrs = pango_attr_list_new ();
- /* Set gnome shape attributes for all bullets */
- for (p = text; (p = strstr (p, BULLET)); p += strlen (BULLET))
- {
- PangoAttribute *attr;
- attr = pango_attr_shape_new_with_data (&ink_rect,
- &logical_rect,
- &GnomeFootLogo,
- NULL, NULL);
- attr->start_index = p - text;
- attr->end_index = attr->start_index + strlen (BULLET);
- pango_attr_list_insert (attrs, attr);
- }
- pango_layout_set_attributes (layout, attrs);
- pango_attr_list_unref (attrs);
- return layout;
- }
- static void
- draw_text (cairo_t *cr, int *width, int *height)
- {
- PangoLayout *layout = get_layout (cr);
- /* Adds a fixed 10-pixel margin on the sides. */
- if (width || height)
- {
- pango_layout_get_pixel_size (layout, width, height);
- if (width)
- *width += 20;
- if (height)
- *height += 20;
- }
- cairo_move_to (cr, 10, 10);
- pango_cairo_show_layout (cr, layout);
- g_object_unref (layout);
- }
- int main (int argc, char **argv)
- {
- cairo_t *cr;
- char *filename;
- cairo_status_t status;
- cairo_surface_t *surface;
- int width, height;
- if (argc != 2)
- {
- filename="output.png";
- //return 1;
- }
- else filename = argv[1];
- /* First create and use a 0x0 surface, to measure how large
- * the final surface needs to be */
- surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
- 0, 0);
- cr = cairo_create (surface);
- draw_text (cr, &width, &height);
- cairo_destroy (cr);
- cairo_surface_destroy (surface);
- /* Now create the final surface and draw to it. */
- surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
- width, height);
- cr = cairo_create (surface);
- cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
- cairo_paint (cr);
- cairo_set_source_rgb (cr, 0.0, 0.0, 0.5);
- draw_text (cr, NULL, NULL);
- cairo_destroy (cr);
- /* Write out the surface as PNG */
- status = cairo_surface_write_to_png (surface, filename);
- cairo_surface_destroy (surface);
- if (status != CAIRO_STATUS_SUCCESS)
- {
- //g_printerr ("Could not save png to '%s'\n", filename);
- return 1;
- }
- {
- FILE *fd = fopen("output.txt","wb");
- assert(fd);
- fwrite(text,strlen(text),1,fd);
- fclose(fd);
- }
- return 0;
- }
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