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-rw-r--r--libs/cairo-1.16.0/util/show-contour.c667
1 files changed, 667 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/util/show-contour.c b/libs/cairo-1.16.0/util/show-contour.c
new file mode 100644
index 0000000..f3fa1ba
--- /dev/null
+++ b/libs/cairo-1.16.0/util/show-contour.c
@@ -0,0 +1,667 @@
+#define _GNU_SOURCE
+#include <gtk/gtk.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <gdk/gdkkeysyms.h>
+#include <math.h>
+
+typedef struct _point {
+ gdouble x, y;
+} point_t;
+typedef struct _box {
+ point_t p1, p2;
+} box_t;
+
+typedef struct _contour {
+ struct _contour *next, *prev;
+ int direction;
+ int num_points;
+ int size;
+ point_t points[0];
+} contour_t;
+
+typedef struct _TrapView {
+ GtkWidget widget;
+
+ cairo_surface_t *pixmap;
+ int pixmap_width, pixmap_height;
+
+ box_t extents;
+ contour_t *contours;
+
+ double px, py;
+
+ gint mag_x, mag_y;
+ gint mag_size;
+ gdouble mag_zoom;
+ gboolean in_mag_drag;
+ gint mag_drag_x, mag_drag_y;
+} TrapView;
+
+typedef struct _TrapViewClass {
+ GtkWidgetClass parent_class;
+} TrapViewClass;
+
+G_DEFINE_TYPE (TrapView, trap_view, GTK_TYPE_WIDGET)
+
+static cairo_surface_t *
+pixmap_create (TrapView *self, cairo_surface_t *target)
+{
+ cairo_surface_t *surface =
+ cairo_surface_create_similar (target, CAIRO_CONTENT_COLOR,
+ self->widget.allocation.width,
+ self->widget.allocation.height);
+ cairo_t *cr = cairo_create (surface);
+ contour_t *contour;
+ gdouble sf_x, sf_y, sf;
+ gdouble mid, dim;
+ gdouble x0, y0;
+ int n;
+ box_t extents;
+
+ cairo_set_source_rgb (cr, 1, 1, 1);
+ cairo_paint (cr);
+
+ if (self->contours == NULL) {
+ cairo_destroy(cr);
+ return surface;
+ }
+
+ extents = self->extents;
+
+ mid = (extents.p2.x + extents.p1.x) / 2.;
+ dim = (extents.p2.x - extents.p1.x) / 2. * 1.25;
+ sf_x = self->widget.allocation.width / dim / 2;
+
+ mid = (extents.p2.y + extents.p1.y) / 2.;
+ dim = (extents.p2.y - extents.p1.y) / 2. * 1.25;
+ sf_y = self->widget.allocation.height / dim / 2;
+
+ sf = MIN (sf_x, sf_y);
+
+ mid = (extents.p2.x + extents.p1.x) / 2.;
+ dim = sf_x / sf * (extents.p2.x - extents.p1.x) / 2. * 1.25;
+ x0 = mid - dim;
+ mid = (extents.p2.y + extents.p1.y) / 2.;
+ dim = sf_y / sf * (extents.p2.y - extents.p1.y) / 2. * 1.25;
+ y0 = mid - dim;
+
+ for (contour = self->contours; contour; contour = contour->next) {
+ if (contour->num_points == 0)
+ continue;
+
+ cairo_save (cr); {
+ cairo_scale (cr, sf, sf);
+ cairo_translate (cr, -x0, -y0);
+ switch (contour->direction) {
+ case -1:
+ cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
+ break;
+ case 0:
+ cairo_set_source_rgb (cr, 0.0, 1.0, 0.0);
+ break;
+ case 1:
+ cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
+ break;
+ }
+ {
+ const point_t *p = &contour->points[0];
+ cairo_arc (cr, p->x, p->y, 4/sf, 0, 2 * M_PI);
+ cairo_save (cr);
+ cairo_identity_matrix (cr);
+ cairo_stroke (cr);
+ cairo_restore (cr);
+ }
+ for (n = 0; n < contour->num_points; n++) {
+ const point_t *p = &contour->points[n];
+ cairo_arc (cr, p->x, p->y, 2/sf, 0, 2 * M_PI);
+ cairo_fill (cr);
+ }
+ for (n = 0; n < contour->num_points; n++) {
+ const point_t *p = &contour->points[n];
+ cairo_line_to (cr, p->x, p->y);
+ }
+ } cairo_restore (cr);
+
+ switch (contour->direction) {
+ case -1:
+ cairo_set_source_rgb (cr, 0.3, 0.3, 0.9);
+ break;
+ case 0:
+ cairo_set_source_rgb (cr, 0.3, 0.9, 0.3);
+ break;
+ case 1:
+ cairo_set_source_rgb (cr, 0.9, 0.3, 0.3);
+ break;
+ }
+ cairo_set_line_width (cr, 1.);
+ cairo_stroke (cr);
+ }
+
+ cairo_destroy (cr);
+ return surface;
+}
+
+static void
+trap_view_draw (TrapView *self, cairo_t *cr)
+{
+ contour_t *contour;
+ gdouble sf_x, sf_y, sf;
+ gdouble mid, dim;
+ gdouble x0, y0;
+ int n;
+ box_t extents;
+
+ extents = self->extents;
+
+ mid = (extents.p2.x + extents.p1.x) / 2.;
+ dim = (extents.p2.x - extents.p1.x) / 2. * 1.25;
+ sf_x = self->widget.allocation.width / dim / 2;
+
+ mid = (extents.p2.y + extents.p1.y) / 2.;
+ dim = (extents.p2.y - extents.p1.y) / 2. * 1.25;
+ sf_y = self->widget.allocation.height / dim / 2;
+
+ sf = MIN (sf_x, sf_y);
+
+ mid = (extents.p2.x + extents.p1.x) / 2.;
+ dim = sf_x / sf * (extents.p2.x - extents.p1.x) / 2. * 1.25;
+ x0 = mid - dim;
+ mid = (extents.p2.y + extents.p1.y) / 2.;
+ dim = sf_y / sf * (extents.p2.y - extents.p1.y) / 2. * 1.25;
+ y0 = mid - dim;
+
+ if (self->pixmap_width != self->widget.allocation.width ||
+ self->pixmap_height != self->widget.allocation.height)
+ {
+ cairo_surface_destroy (self->pixmap);
+ self->pixmap = pixmap_create (self, cairo_get_target (cr));
+ self->pixmap_width = self->widget.allocation.width;
+ self->pixmap_height = self->widget.allocation.height;
+ }
+
+ cairo_set_source_surface (cr, self->pixmap, 0, 0);
+ cairo_paint (cr);
+
+ if (self->contours == NULL)
+ return;
+
+ /* draw a zoom view of the area around the mouse */
+ if (1) {
+ double zoom = self->mag_zoom;
+ int size = self->mag_size;
+ int mag_x = self->mag_x;
+ int mag_y = self->mag_y;
+
+ if (1) {
+ if (self->px + size < self->widget.allocation.width/2)
+ mag_x = self->px + size/4;
+ else
+ mag_x = self->px - size/4 - size;
+ mag_y = self->py - size/2;
+ if (mag_y < 0)
+ mag_y = 0;
+ if (mag_y + size > self->widget.allocation.height)
+ mag_y = self->widget.allocation.height - size;
+ }
+
+ cairo_save (cr); {
+ /* bottom right */
+ cairo_rectangle (cr, mag_x, mag_y, size, size);
+ cairo_stroke_preserve (cr);
+ cairo_set_source_rgb (cr, 1, 1, 1);
+ cairo_fill_preserve (cr);
+ cairo_clip (cr);
+
+ /* compute roi in extents */
+ cairo_translate (cr, mag_x + size/2, mag_y + size/2);
+
+ cairo_save (cr); {
+ for (contour = self->contours; contour; contour = contour->next) {
+ if (contour->num_points == 0)
+ continue;
+
+ cairo_save (cr); {
+ cairo_scale (cr, zoom, zoom);
+ cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
+ switch (contour->direction) {
+ case -1:
+ cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
+ break;
+ case 0:
+ cairo_set_source_rgb (cr, 0.0, 1.0, 0.0);
+ break;
+ case 1:
+ cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
+ break;
+ }
+ {
+ const point_t *p = &contour->points[0];
+ cairo_arc (cr, p->x, p->y, 4/zoom, 0, 2 * M_PI);
+ cairo_save (cr);
+ cairo_identity_matrix (cr);
+ cairo_stroke (cr);
+ cairo_restore (cr);
+ }
+ for (n = 0; n < contour->num_points; n++) {
+ const point_t *p = &contour->points[n];
+ cairo_arc (cr, p->x, p->y, 2/zoom, 0, 2 * M_PI);
+ cairo_fill (cr);
+ }
+ for (n = 0; n < contour->num_points; n++) {
+ const point_t *p = &contour->points[n];
+ cairo_line_to (cr, p->x, p->y);
+ }
+ } cairo_restore (cr);
+
+ switch (contour->direction) {
+ case -1:
+ cairo_set_source_rgb (cr, 0.3, 0.3, 0.9);
+ break;
+ case 0:
+ cairo_set_source_rgb (cr, 0.3, 0.9, 0.3);
+ break;
+ case 1:
+ cairo_set_source_rgb (cr, 0.9, 0.3, 0.3);
+ break;
+ }
+ cairo_stroke (cr);
+ }
+ } cairo_restore (cr);
+
+ /* grid */
+ cairo_save (cr); {
+ int i;
+
+ cairo_translate (cr,
+ -zoom*fmod (self->px/sf + x0, 1.),
+ -zoom*fmod (self->py/sf + y0, 1.));
+ zoom /= 2;
+ for (i = -size/2/zoom; i <= size/2/zoom + 1; i+=2) {
+ cairo_move_to (cr, zoom*i, -size/2);
+ cairo_line_to (cr, zoom*i, size/2 + zoom);
+ cairo_move_to (cr, -size/2, zoom*i);
+ cairo_line_to (cr, size/2 + zoom, zoom*i);
+ }
+ zoom *= 2;
+ cairo_set_source_rgba (cr, .7, .7, .7, .5);
+ cairo_set_line_width (cr, 1.);
+ cairo_stroke (cr);
+
+ for (i = -size/2/zoom - 1; i <= size/2/zoom + 1; i++) {
+ cairo_move_to (cr, zoom*i, -size/2);
+ cairo_line_to (cr, zoom*i, size/2 + zoom);
+ cairo_move_to (cr, -size/2, zoom*i);
+ cairo_line_to (cr, size/2 + zoom, zoom*i);
+ }
+ cairo_set_source_rgba (cr, .1, .1, .1, .5);
+ cairo_set_line_width (cr, 2.);
+ cairo_stroke (cr);
+ } cairo_restore (cr);
+
+ } cairo_restore (cr);
+ }
+}
+
+
+static gdouble
+edge_length (const point_t *p1, const point_t *p2)
+{
+ return hypot (p2->x - p1->x, p2->y - p1->y);
+}
+
+static gdouble
+contour_compute_total_length (const contour_t *contour)
+{
+ int n;
+ gdouble len = 0.;
+ for (n = 1; n < contour->num_points; n++)
+ len += edge_length (&contour->points[n-1], &contour->points[n]);
+ return len;
+}
+
+static void
+trap_view_draw_labels (TrapView *self, cairo_t *cr)
+{
+ contour_t *contour;
+ int y = 12;
+
+ for (contour = self->contours; contour; contour = contour->next) {
+ double total_length = contour_compute_total_length (contour) / 256.;
+ PangoLayout *layout;
+ gint width, height;
+ GString *string;
+ gchar *str;
+
+ if (contour->num_points == 0)
+ continue;
+
+ string = g_string_new (NULL);
+ g_string_append_printf (string,
+ "Number of points:\t%d\n"
+ "Total length of contour: \t%.2f",
+ contour->num_points,
+ total_length);
+
+ str = g_string_free (string, FALSE);
+ layout = gtk_widget_create_pango_layout (&self->widget, str);
+ g_free (str);
+
+ pango_layout_get_pixel_size (layout, &width, &height);
+
+ switch (contour->direction) {
+ case -1:
+ cairo_set_source_rgb (cr, 0.9, 0.3, 0.3);
+ break;
+ case 0:
+ cairo_set_source_rgb (cr, 0.3, 0.9, 0.3);
+ break;
+ case 1:
+ cairo_set_source_rgb (cr, 0.3, 0.3, 0.9);
+ break;
+ }
+
+ cairo_move_to (cr, 10, y);
+ pango_cairo_show_layout (cr, layout);
+ g_object_unref (layout);
+
+ y += height + 4;
+ }
+}
+
+static gboolean
+trap_view_expose (GtkWidget *w, GdkEventExpose *ev)
+{
+ TrapView *self = (TrapView *) w;
+ cairo_t *cr;
+
+ cr = gdk_cairo_create (w->window);
+ gdk_cairo_region (cr, ev->region);
+ cairo_clip (cr);
+
+ trap_view_draw (self, cr);
+ trap_view_draw_labels (self, cr);
+
+ cairo_destroy (cr);
+ return FALSE;
+}
+
+static gboolean
+trap_view_key_press (GtkWidget *w, GdkEventKey *ev)
+{
+ switch (ev->keyval) {
+ case GDK_Escape:
+ case GDK_Q:
+ gtk_main_quit ();
+ break;
+ }
+
+ return FALSE;
+}
+
+static gboolean
+trap_view_button_press (GtkWidget *w, GdkEventButton *ev)
+{
+ TrapView *self = (TrapView *) w;
+
+ if (ev->x < self->mag_x ||
+ ev->y < self->mag_y ||
+ ev->x > self->mag_x + self->mag_size ||
+ ev->y > self->mag_y + self->mag_size)
+ {
+ }
+ else
+ {
+ self->in_mag_drag = TRUE;
+ self->mag_drag_x = ev->x;
+ self->mag_drag_y = ev->y;
+ }
+
+ return FALSE;
+}
+
+static gboolean
+trap_view_button_release (GtkWidget *w, GdkEventButton *ev)
+{
+ TrapView *self = (TrapView *) w;
+
+ self->in_mag_drag = FALSE;
+
+ return FALSE;
+}
+
+static void
+trap_view_update_mouse (TrapView *self, GdkEventMotion *ev)
+{
+ self->px = ev->x;
+ self->py = ev->y;
+
+ gtk_widget_queue_draw (&self->widget);
+}
+
+static void
+trap_view_update_magnifier (TrapView *self, gint *xy)
+{
+ self->mag_x = xy[0];
+ self->mag_y = xy[1];
+
+ gtk_widget_queue_draw (&self->widget);
+}
+
+static gboolean
+trap_view_motion (GtkWidget *w, GdkEventMotion *ev)
+{
+ TrapView *self = (TrapView *) w;
+
+ if (self->in_mag_drag) {
+ int xy[2];
+
+ xy[0] = self->mag_x + ev->x - self->mag_drag_x;
+ xy[1] = self->mag_y + ev->y - self->mag_drag_y;
+
+ trap_view_update_magnifier (self, xy);
+
+ self->mag_drag_x = ev->x;
+ self->mag_drag_y = ev->y;
+ } else if (ev->x < self->mag_x ||
+ ev->y < self->mag_y ||
+ ev->x > self->mag_x + self->mag_size ||
+ ev->y > self->mag_y + self->mag_size)
+ {
+ trap_view_update_mouse (self, ev);
+ }
+
+ return FALSE;
+}
+
+static void
+trap_view_realize (GtkWidget *widget)
+{
+ GdkWindowAttr attributes;
+
+ GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
+
+ attributes.window_type = GDK_WINDOW_CHILD;
+ attributes.x = widget->allocation.x;
+ attributes.y = widget->allocation.y;
+ attributes.width = widget->allocation.width;
+ attributes.height = widget->allocation.height;
+ attributes.wclass = GDK_INPUT_OUTPUT;
+ attributes.visual = gtk_widget_get_visual (widget);
+ attributes.colormap = gtk_widget_get_colormap (widget);
+ attributes.event_mask = gtk_widget_get_events (widget) |
+ GDK_BUTTON_PRESS_MASK |
+ GDK_BUTTON_RELEASE_MASK |
+ GDK_KEY_PRESS_MASK |
+ GDK_KEY_RELEASE_MASK |
+ GDK_POINTER_MOTION_MASK |
+ GDK_BUTTON_MOTION_MASK |
+ GDK_EXPOSURE_MASK;
+
+ widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
+ &attributes,
+ GDK_WA_X | GDK_WA_Y |
+ GDK_WA_VISUAL | GDK_WA_COLORMAP);
+ gdk_window_set_user_data (widget->window, widget);
+
+ widget->style = gtk_style_attach (widget->style, widget->window);
+ gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
+}
+
+static void
+trap_view_size_allocate (GtkWidget *w, GdkRectangle *r)
+{
+ TrapView *self = (TrapView *) w;
+
+ GTK_WIDGET_CLASS (trap_view_parent_class)->size_allocate (w, r);
+
+ self->mag_x = w->allocation.width - self->mag_size - 10;
+ self->mag_y = w->allocation.height - self->mag_size - 10;
+}
+
+static void
+trap_view_finalize (GObject *obj)
+{
+ G_OBJECT_CLASS (trap_view_parent_class)->finalize (obj);
+}
+
+static void
+trap_view_class_init (TrapViewClass *klass)
+{
+ GObjectClass *object_class = (GObjectClass *) klass;
+ GtkWidgetClass *widget_class = (GtkWidgetClass *) klass;
+
+ object_class->finalize = trap_view_finalize;
+
+ widget_class->realize = trap_view_realize;
+ widget_class->size_allocate = trap_view_size_allocate;
+ widget_class->expose_event = trap_view_expose;
+ widget_class->key_press_event = trap_view_key_press;
+ widget_class->button_press_event = trap_view_button_press;
+ widget_class->button_release_event = trap_view_button_release;
+ widget_class->motion_notify_event = trap_view_motion;
+}
+
+static void
+trap_view_init (TrapView *self)
+{
+ self->mag_zoom = 64;
+ self->mag_size = 200;
+
+ self->extents.p1.x = G_MAXDOUBLE;
+ self->extents.p1.y = G_MAXDOUBLE;
+ self->extents.p2.x = -G_MAXDOUBLE;
+ self->extents.p2.y = -G_MAXDOUBLE;
+
+ GTK_WIDGET_SET_FLAGS (self, GTK_CAN_FOCUS);
+}
+
+static contour_t *
+_contour_add_point (TrapView *tv, contour_t *contour, point_t *p)
+{
+ if (contour == NULL)
+ return NULL;
+
+ if (p->y < tv->extents.p1.y)
+ tv->extents.p1.y = p->y;
+ if (p->y > tv->extents.p2.y)
+ tv->extents.p2.y = p->y;
+
+ if (p->x < tv->extents.p1.x)
+ tv->extents.p1.x = p->x;
+ if (p->x > tv->extents.p2.x)
+ tv->extents.p2.x = p->x;
+
+ if (contour->num_points == contour->size) {
+ int newsize = 2 * contour->size;
+ void *newcontour;
+
+ newcontour = g_realloc (contour,
+ sizeof (contour_t) + newsize * sizeof (point_t));
+ if (newcontour == NULL)
+ return contour;
+
+ contour = newcontour;
+ contour->size = newsize;
+
+ if (contour->next != NULL)
+ contour->next->prev = newcontour;
+ if (contour->prev != NULL)
+ contour->prev->next = newcontour;
+ else
+ tv->contours = newcontour;
+ }
+
+ contour->points[contour->num_points++] = *p;
+
+ return contour;
+}
+
+static contour_t *
+contour_new (TrapView *tv, int direction)
+{
+ contour_t *t;
+
+ t = g_malloc (sizeof (contour_t) + 128 * sizeof (point_t));
+ t->direction = direction;
+ t->prev = NULL;
+ t->next = tv->contours;
+ if (tv->contours)
+ tv->contours->prev = t;
+ tv->contours = t;
+
+ t->size = 128;
+ t->num_points = 0;
+
+ return t;
+}
+
+int
+main (int argc, char **argv)
+{
+ TrapView *tv;
+ contour_t *contour = NULL;
+ GtkWidget *window;
+ FILE *file;
+ char *line = NULL;
+ size_t len = 0;
+
+ gtk_init (&argc, &argv);
+
+ tv = g_object_new (trap_view_get_type (), NULL);
+
+ file = fopen (argv[1], "r");
+ if (file != NULL) {
+ while (getline (&line, &len, file) != -1) {
+ point_t p;
+ int direction;
+
+ if (sscanf (line, "contour: direction=%d", &direction)) {
+ if (contour)
+ g_print ("read %d contour\n", contour->num_points);
+
+ contour = contour_new (tv, direction);
+ } else if (sscanf (line, " [%*d] = (%lf, %lf)", &p.x, &p.y) == 2) {
+ contour = _contour_add_point (tv, contour, &p);
+ }
+ }
+
+ if (contour)
+ g_print ("read %d contour\n", contour->num_points);
+
+ g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
+ tv->extents.p1.x, tv->extents.p1.y,
+ tv->extents.p2.x, tv->extents.p2.y);
+ fclose (file);
+ }
+
+ window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+ g_signal_connect (window, "delete-event",
+ G_CALLBACK (gtk_main_quit), NULL);
+ gtk_widget_set_size_request (window, 800, 800);
+ gtk_container_add (GTK_CONTAINER (window), &tv->widget);
+ gtk_widget_show_all (window);
+
+ gtk_main ();
+ return 0;
+}
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