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-rw-r--r--libs/cairo-1.16.0/util/show-polygon.c646
1 files changed, 646 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/util/show-polygon.c b/libs/cairo-1.16.0/util/show-polygon.c
new file mode 100644
index 0000000..35c0014
--- /dev/null
+++ b/libs/cairo-1.16.0/util/show-polygon.c
@@ -0,0 +1,646 @@
+#define _GNU_SOURCE
+#include <gtk/gtk.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <gdk/gdkkeysyms.h>
+#include <math.h>
+
+typedef struct _point {
+ gdouble x, y;
+} point_t;
+typedef struct _edge {
+ point_t p1, p2;
+ gdouble top, bot;
+ int dir;
+} edge_t;
+typedef struct _box {
+ point_t p1, p2;
+} box_t;
+
+typedef struct _polygon {
+ struct _polygon *next, *prev;
+ int num_edges;
+ int size;
+ edge_t edges[0];
+} polygon_t;
+
+typedef struct _PolygonView {
+ GtkWidget widget;
+
+ cairo_surface_t *pixmap;
+ int pixmap_width, pixmap_height;
+
+ box_t extents;
+ polygon_t *polygons;
+
+ 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;
+} PolygonView;
+
+typedef struct _PolygonViewClass {
+ GtkWidgetClass parent_class;
+} PolygonViewClass;
+
+G_DEFINE_TYPE (PolygonView, polygon_view, GTK_TYPE_WIDGET)
+
+double highlight = -1;
+
+static void draw_edges (cairo_t *cr, polygon_t *p, gdouble sf, int dir)
+{
+ int n;
+
+ if (dir < 0)
+ cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
+ else
+ cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
+
+ for (n = 0; n < p->num_edges; n++) {
+ const edge_t *e = &p->edges[n];
+ double dx, dy;
+ double x1, x2;
+
+ if (e->dir != dir)
+ continue;
+
+ dx = e->p2.x - e->p1.x;
+ dy = e->p2.y - e->p1.y;
+
+ x1 = e->p1.x + (e->top - e->p1.y) / dy * dx;
+ x2 = e->p1.x + (e->bot - e->p1.y) / dy * dx;
+
+ cairo_arc (cr, x1, e->top, 2/sf, 0, 2*M_PI);
+ cairo_arc (cr, x2, e->bot, 2/sf, 0, 2*M_PI);
+ cairo_fill (cr);
+ }
+
+ if (dir < 0)
+ cairo_set_source_rgba (cr, 0.0, 0.0, 1.0, 0.5);
+ else
+ cairo_set_source_rgba (cr, 1.0, 0.0, 0.0, 0.5);
+
+ for (n = 0; n < p->num_edges; n++) {
+ const edge_t *e = &p->edges[n];
+
+ if (e->dir != dir)
+ continue;
+
+ cairo_move_to (cr, e->p1.x, e->p1.y);
+ cairo_line_to (cr, e->p2.x, e->p2.y);
+ }
+ cairo_save (cr); {
+ cairo_identity_matrix (cr);
+ cairo_set_line_width (cr, 1.);
+ cairo_stroke (cr);
+ } cairo_restore (cr);
+
+ if (dir < 0)
+ cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
+ else
+ cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
+
+ for (n = 0; n < p->num_edges; n++) {
+ const edge_t *e = &p->edges[n];
+ double dx, dy;
+ double x1, x2;
+
+ if (e->dir != dir)
+ continue;
+
+ dx = e->p2.x - e->p1.x;
+ dy = e->p2.y - e->p1.y;
+
+ x1 = e->p1.x + (e->top - e->p1.y) / dy * dx;
+ x2 = e->p1.x + (e->bot - e->p1.y) / dy * dx;
+
+ cairo_move_to (cr, x1, e->top);
+ cairo_line_to (cr, x2, e->bot);
+ }
+ cairo_save (cr); {
+ cairo_identity_matrix (cr);
+ cairo_set_line_width (cr, 1.);
+ cairo_stroke (cr);
+ } cairo_restore (cr);
+}
+
+static void draw_polygon (cairo_t *cr, polygon_t *p, gdouble sf)
+{
+ draw_edges (cr, p, sf, -1);
+
+ draw_edges (cr, p, sf, +1);
+}
+
+static cairo_surface_t *
+pixmap_create (PolygonView *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);
+ polygon_t *polygon;
+ gdouble sf_x, sf_y, sf;
+ gdouble mid, dim;
+ gdouble x0, y0;
+ box_t extents;
+
+ cairo_set_source_rgb (cr, 1, 1, 1);
+ cairo_paint (cr);
+
+ if (self->polygons == 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;
+
+ cairo_save (cr); {
+ cairo_scale (cr, sf, sf);
+ cairo_translate (cr, -x0, -y0);
+
+ for (polygon = self->polygons; polygon; polygon = polygon->next) {
+ if (polygon->num_edges == 0)
+ continue;
+
+ draw_polygon (cr, polygon, sf);
+ }
+
+ if (highlight != -1) {
+ cairo_move_to (cr, extents.p1.x, highlight);
+ cairo_line_to (cr, extents.p2.x, highlight);
+ cairo_set_source_rgb (cr, 0, .7, 0);
+ cairo_save (cr);
+ cairo_identity_matrix (cr);
+ cairo_set_line_width (cr, 1.);
+ cairo_stroke (cr);
+ cairo_restore (cr);
+ }
+ } cairo_restore (cr);
+
+ cairo_destroy (cr);
+ return surface;
+}
+
+static void
+polygon_view_draw (PolygonView *self, cairo_t *cr)
+{
+ polygon_t *polygon;
+ gdouble sf_x, sf_y, sf;
+ gdouble mid, dim;
+ gdouble x0, y0;
+ 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->polygons == 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); {
+ cairo_scale (cr, zoom, zoom);
+ cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
+ for (polygon = self->polygons; polygon; polygon = polygon->next) {
+ if (polygon->num_edges == 0)
+ continue;
+
+ draw_polygon (cr, polygon, zoom);
+ }
+
+ if (highlight != -1) {
+ cairo_move_to (cr, extents.p1.x, highlight);
+ cairo_line_to (cr, extents.p2.x, highlight);
+ cairo_set_source_rgb (cr, 0, .7, 0);
+ cairo_save (cr);
+ cairo_identity_matrix (cr);
+ cairo_set_line_width (cr, 1.);
+ cairo_stroke (cr);
+ cairo_restore (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 gboolean
+polygon_view_expose (GtkWidget *w, GdkEventExpose *ev)
+{
+ PolygonView *self = (PolygonView *) w;
+ cairo_t *cr;
+
+ cr = gdk_cairo_create (w->window);
+ gdk_cairo_region (cr, ev->region);
+ cairo_clip (cr);
+
+ polygon_view_draw (self, cr);
+
+ cairo_destroy (cr);
+ return FALSE;
+}
+
+static gboolean
+polygon_view_key_press (GtkWidget *w, GdkEventKey *ev)
+{
+ switch (ev->keyval) {
+ case GDK_Escape:
+ case GDK_Q:
+ gtk_main_quit ();
+ break;
+ }
+
+ return FALSE;
+}
+
+static gboolean
+polygon_view_button_press (GtkWidget *w, GdkEventButton *ev)
+{
+ PolygonView *self = (PolygonView *) 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
+polygon_view_button_release (GtkWidget *w, GdkEventButton *ev)
+{
+ PolygonView *self = (PolygonView *) w;
+
+ self->in_mag_drag = FALSE;
+
+ return FALSE;
+}
+
+static void
+polygon_view_update_mouse (PolygonView *self, GdkEventMotion *ev)
+{
+ self->px = ev->x;
+ self->py = ev->y;
+
+ gtk_widget_queue_draw (&self->widget);
+}
+
+static void
+polygon_view_update_magnifier (PolygonView *self, gint *xy)
+{
+ self->mag_x = xy[0];
+ self->mag_y = xy[1];
+
+ gtk_widget_queue_draw (&self->widget);
+}
+
+static gboolean
+polygon_view_motion (GtkWidget *w, GdkEventMotion *ev)
+{
+ PolygonView *self = (PolygonView *) 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;
+
+ polygon_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)
+ {
+ polygon_view_update_mouse (self, ev);
+ }
+
+ return FALSE;
+}
+
+static void
+polygon_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
+polygon_view_size_allocate (GtkWidget *w, GdkRectangle *r)
+{
+ PolygonView *self = (PolygonView *) w;
+
+ GTK_WIDGET_CLASS (polygon_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
+polygon_view_finalize (GObject *obj)
+{
+ G_OBJECT_CLASS (polygon_view_parent_class)->finalize (obj);
+}
+
+static void
+polygon_view_class_init (PolygonViewClass *klass)
+{
+ GObjectClass *object_class = (GObjectClass *) klass;
+ GtkWidgetClass *widget_class = (GtkWidgetClass *) klass;
+
+ object_class->finalize = polygon_view_finalize;
+
+ widget_class->realize = polygon_view_realize;
+ widget_class->size_allocate = polygon_view_size_allocate;
+ widget_class->expose_event = polygon_view_expose;
+ widget_class->key_press_event = polygon_view_key_press;
+ widget_class->button_press_event = polygon_view_button_press;
+ widget_class->button_release_event = polygon_view_button_release;
+ widget_class->motion_notify_event = polygon_view_motion;
+}
+
+static void
+polygon_view_init (PolygonView *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 polygon_t *
+_polygon_add_edge (PolygonView *view, polygon_t *polygon,
+ point_t *p1, point_t *p2,
+ gdouble top, gdouble bot, int dir)
+{
+ if (polygon == NULL)
+ return NULL;
+
+ if (top < view->extents.p1.y)
+ view->extents.p1.y = top;
+ if (bot > view->extents.p2.y)
+ view->extents.p2.y = bot;
+
+ if (p1->x < view->extents.p1.x)
+ view->extents.p1.x = p1->x;
+ if (p1->x > view->extents.p2.x)
+ view->extents.p2.x = p1->x;
+ if (p2->x < view->extents.p1.x)
+ view->extents.p1.x = p2->x;
+ if (p2->x > view->extents.p2.x)
+ view->extents.p2.x = p2->x;
+
+ if (polygon->num_edges == polygon->size) {
+ int newsize = 2 * polygon->size;
+ void *newpolygon;
+
+ newpolygon = g_realloc (polygon,
+ sizeof (polygon_t) + newsize * sizeof (edge_t));
+ if (newpolygon == NULL)
+ return polygon;
+
+ polygon = newpolygon;
+ polygon->size = newsize;
+
+ if (polygon->next != NULL)
+ polygon->next->prev = newpolygon;
+ if (polygon->prev != NULL)
+ polygon->prev->next = newpolygon;
+ else
+ view->polygons = newpolygon;
+ }
+
+ polygon->edges[polygon->num_edges].p1 = *p1;
+ polygon->edges[polygon->num_edges].p2 = *p2;
+ polygon->edges[polygon->num_edges].top = top;
+ polygon->edges[polygon->num_edges].bot = bot;
+ polygon->edges[polygon->num_edges].dir = dir;
+ polygon->num_edges++;
+
+ return polygon;
+}
+
+static polygon_t *
+polygon_new (PolygonView *view)
+{
+ polygon_t *t;
+
+ t = g_malloc (sizeof (polygon_t) + 128 * sizeof (edge_t));
+ t->prev = NULL;
+ t->next = view->polygons;
+ if (view->polygons)
+ view->polygons->prev = t;
+ view->polygons = t;
+
+ t->size = 128;
+ t->num_edges = 0;
+
+ return t;
+}
+
+int
+main (int argc, char **argv)
+{
+ PolygonView *view;
+ polygon_t *polygon = NULL;
+ GtkWidget *window;
+ FILE *file;
+ char *line = NULL;
+ size_t len = 0;
+
+ gtk_init (&argc, &argv);
+
+ view = g_object_new (polygon_view_get_type (), NULL);
+
+ file = fopen (argv[1], "r");
+ if (file != NULL) {
+ while (getline (&line, &len, file) != -1) {
+ point_t p1, p2;
+ double top, bottom;
+ int dir;
+
+ if (strncmp (line, "polygon: ", sizeof("polygon: ")-1) == 0) {
+ if (polygon && polygon->num_edges) {
+ g_print ("read polygon with %d edges\n", polygon->num_edges);
+
+ polygon = polygon_new (view);
+ } else if (polygon == NULL)
+ polygon = polygon_new (view);
+ } else if (sscanf (line, " [%*d] = [(%lf, %lf), (%lf, %lf)], top=%lf, bottom=%lf, dir=%d", &p1.x, &p1.y, &p2.x, &p2.y, &top, &bottom, &dir) == 7) {
+ polygon = _polygon_add_edge (view, polygon, &p1, &p2,
+ top, bottom, dir);
+ }
+ }
+
+ if (polygon && polygon->num_edges)
+ g_print ("read polygon with %d edges\n", polygon->num_edges);
+
+ g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
+ view->extents.p1.x, view->extents.p1.y,
+ view->extents.p2.x, view->extents.p2.y);
+ fclose (file);
+ }
+
+ if (argc > 2)
+ highlight = atof (argv[2]);
+
+ 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), &view->widget);
+ gtk_widget_show_all (window);
+
+ gtk_main ();
+ return 0;
+}
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