static cairo_t *
gdk_cairo_create (GdkDrawable *drawable)
{
int width, height;
cairo_t *cr = NULL;
cairo_surface_t *surface = NULL;
GdkVisual *visual = gdk_drawable_get_visual (drawable);
gdk_drawable_get_size (drawable, &width, &height);
if (visual)
surface = cairo_xlib_surface_create (GDK_DRAWABLE_XDISPLAY (drawable),
GDK_DRAWABLE_XID (drawable),
GDK_VISUAL_XVISUAL (visual),
width, height);
else if (gdk_drawable_get_depth (drawable) == 1)
surface = cairo_xlib_surface_create_for_bitmap
(GDK_PIXMAP_XDISPLAY (drawable),
GDK_PIXMAP_XID (drawable),
GDK_SCREEN_XSCREEN (gdk_drawable_get_screen (drawable)),
width, height);
else {
g_warning ("Using Cairo rendering requires the drawable argument to\n"
"have a specified colormap. All windows have a colormap,\n"
"however, pixmaps only have colormap by default if they\n"
"were created with a non-NULL window argument. Otherwise\n"
"a colormap must be set on them with "
"gdk_drawable_set_colormap");
return NULL;
}
if (surface) {
cr = cairo_create (surface);
cairo_surface_destroy (surface);
}
return cr;
}
void setup_plot_drawable( App *a )
{
struct
{
Display *display;
Drawable drawable;
} xinfo;
PLFLT x[3] = { 1, 3, 4 };
PLFLT y[3] = { 3, 2, 5 };
plsdev( "xcairo" );
plsetopt( "drvopt", "external_drawable" );
plinit();
#if TO_PIXMAP == 1
// Here we set up to draw to a pixmap
xinfo.display = GDK_PIXMAP_XDISPLAY( a->plotwindow_pixmap );
xinfo.drawable = GDK_PIXMAP_XID( a->plotwindow_pixmap );
#else
// Alternatively, we can do direct to a visible X Window
xinfo.display = GDK_WINDOW_XDISPLAY( a->plotwindow->window );
xinfo.drawable = GDK_WINDOW_XID( a->plotwindow->window );
#endif
pl_cmd( PLESC_DEVINIT, &xinfo );
plenv( 0, 5, 0, 5, 0, 0 );
plline( 3, x, y );
plend();
}
static GdkPixmap *
create_text_pixmap(GtkWidget *drawing_area, FT_Face face)
{
gint i, pixmap_width, pixmap_height, pos_y, textlen;
GdkPixmap *pixmap = NULL;
const gchar *text;
Display *xdisplay;
Drawable xdrawable;
Visual *xvisual;
Colormap xcolormap;
XftDraw *draw;
XftColor colour;
XGlyphInfo extents;
XftFont *font;
gint *sizes = NULL, n_sizes, alpha_size;
FcCharSet *charset = NULL;
cairo_t *cr;
GdkWindow *window = gtk_widget_get_window (drawing_area);
text = pango_language_get_sample_string(NULL);
if (! check_font_contain_text (face, text))
{
pango_language_get_sample_string (pango_language_from_string ("en_US"));
}
textlen = strlen(text);
/* create the XftDraw */
xdisplay = GDK_PIXMAP_XDISPLAY(window);
#if GTK_CHECK_VERSION(3, 0, 0)
xvisual = GDK_VISUAL_XVISUAL(gdk_window_get_visual(window));
#else
xvisual = GDK_VISUAL_XVISUAL(gdk_drawable_get_visual(window));
#endif
xcolormap = GDK_COLORMAP_XCOLORMAP(gdk_drawable_get_colormap(window));
XftColorAllocName(xdisplay, xvisual, xcolormap, "black", &colour);
/* work out what sizes to render */
if (FT_IS_SCALABLE(face)) {
n_sizes = 8;
sizes = g_new(gint, n_sizes);
sizes[0] = 8;
sizes[1] = 10;
sizes[2] = 12;
sizes[3] = 18;
sizes[4] = 24;
sizes[5] = 36;
sizes[6] = 48;
sizes[7] = 72;
alpha_size = 24;
} else {
/* use fixed sizes */
n_sizes = face->num_fixed_sizes;
sizes = g_new(gint, n_sizes);
alpha_size = 0;
for (i = 0; i < face->num_fixed_sizes; i++) {
sizes[i] = face->available_sizes[i].height;
/* work out which font size to render */
if (face->available_sizes[i].height <= 24)
alpha_size = face->available_sizes[i].height;
}
}
/* calculate size of pixmap to use (with 4 pixels padding) ... */
pixmap_width = 8;
pixmap_height = 8;
font = get_font(xdisplay, face, alpha_size, charset);
charset = FcCharSetCopy (font->charset);
XftTextExtentsUtf8(xdisplay, font,
(guchar *)lowercase_text, strlen(lowercase_text), &extents);
pixmap_height += extents.height + 4;
pixmap_width = MAX(pixmap_width, 8 + extents.width);
XftTextExtentsUtf8(xdisplay, font,
(guchar *)uppercase_text, strlen(uppercase_text), &extents);
pixmap_height += extents.height + 4;
pixmap_width = MAX(pixmap_width, 8 + extents.width);
XftTextExtentsUtf8(xdisplay, font,
(guchar *)punctuation_text, strlen(punctuation_text), &extents);
pixmap_height += extents.height + 4;
pixmap_width = MAX(pixmap_width, 8 + extents.width);
XftFontClose(xdisplay, font);
pixmap_height += 8;
for (i = 0; i < n_sizes; i++) {
font = get_font(xdisplay, face, sizes[i], charset);
if (!font) continue;
XftTextExtentsUtf8(xdisplay, font, (guchar *)text, textlen, &extents);
pixmap_height += extents.height + 4;
pixmap_width = MAX(pixmap_width, 8 + extents.width);
XftFontClose(xdisplay, font);
}
/* create pixmap */
gtk_widget_set_size_request(drawing_area, pixmap_width, pixmap_height);
pixmap = gdk_pixmap_new(window,
pixmap_width, pixmap_height, -1);
if (!pixmap)
goto end;
cr = gdk_cairo_create (pixmap);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_destroy (cr);
xdrawable = GDK_DRAWABLE_XID(pixmap);
draw = XftDrawCreate(xdisplay, xdrawable, xvisual, xcolormap);
/* draw text */
pos_y = 4;
font = get_font(xdisplay, face, alpha_size, charset);
draw_string(xdisplay, draw, font, &colour, lowercase_text, &pos_y);
draw_string(xdisplay, draw, font, &colour, uppercase_text, &pos_y);
draw_string(xdisplay, draw, font, &colour, punctuation_text, &pos_y);
XftFontClose(xdisplay, font);
pos_y += 8;
for (i = 0; i < n_sizes; i++) {
font = get_font(xdisplay, face, sizes[i], charset);
if (!font) continue;
draw_string(xdisplay, draw, font, &colour, text, &pos_y);
XftFontClose(xdisplay, font);
}
g_signal_connect(drawing_area, "expose-event", G_CALLBACK(expose_event),
pixmap);
end:
g_free(sizes);
FcCharSetDestroy (charset);
return pixmap;
}
