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-rw-r--r--app/widgets/gimpcairo-wilber.c1010
1 files changed, 1010 insertions, 0 deletions
diff --git a/app/widgets/gimpcairo-wilber.c b/app/widgets/gimpcairo-wilber.c
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+++ b/app/widgets/gimpcairo-wilber.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * Wilber Cairo rendering
+ * Copyright (C) 2008 Sven Neumann <sven@gimp.org>
+ *
+ * Some code here is based on code from librsvg that was originally
+ * written by Raph Levien <raph@artofcode.com> for Gill.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+
+#include "widgets-types.h"
+
+#include "gimpcairo-wilber.h"
+
+
+static void gimp_cairo_wilber_internal (GtkWidget *widget,
+ cairo_t *cr,
+ gdouble x,
+ gdouble y,
+ gdouble factor,
+ gdouble max_eye_angle);
+static void gimp_cairo_eyes (GtkWidget *widget,
+ cairo_t *cr,
+ gdouble x,
+ gdouble y,
+ gdouble factor,
+ gdouble max_eye_angle);
+
+
+static gboolean pointer_eyes = FALSE;
+static GSList *cairo_wilber_widgets = NULL;
+
+
+void
+gimp_cairo_wilber_toggle_pointer_eyes (void)
+{
+ GSList *iter;
+
+ pointer_eyes = ! pointer_eyes;
+
+ for (iter = cairo_wilber_widgets; iter; iter = g_slist_next (iter))
+ {
+ if (pointer_eyes)
+ g_object_set_data (G_OBJECT (iter->data), "wilber-eyes-state", NULL);
+
+ gtk_widget_queue_draw (GTK_WIDGET (iter->data));
+ }
+}
+
+void
+gimp_cairo_draw_toolbox_wilber (GtkWidget *widget,
+ cairo_t *cr)
+{
+ GtkStyle *style;
+ GtkStateType state;
+ GtkAllocation allocation;
+ gdouble wilber_width;
+ gdouble wilber_height;
+ gdouble factor;
+
+ g_return_if_fail (GTK_IS_WIDGET (widget));
+ g_return_if_fail (cr != NULL);
+
+ style = gtk_widget_get_style (widget);
+ state = gtk_widget_get_state (widget);
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ gimp_cairo_wilber_get_size (cr, &wilber_width, &wilber_height);
+
+ factor = allocation.width / wilber_width * 0.9;
+
+ if (! gtk_widget_get_has_window (widget))
+ cairo_translate (cr, allocation.x, allocation.y);
+
+ cairo_scale (cr, factor, factor);
+
+ gimp_cairo_wilber_internal (widget, cr,
+ (allocation.width / factor - wilber_width) / 2.0,
+ (allocation.height / factor - wilber_height) / 2.0,
+ factor, 30.0 * G_PI / 180.0);
+
+ cairo_set_source_rgba (cr,
+ style->fg[state].red / 65535.0,
+ style->fg[state].green / 65535.0,
+ style->fg[state].blue / 65535.0,
+ 0.10);
+ cairo_fill (cr);
+}
+
+void
+gimp_cairo_draw_drop_wilber (GtkWidget *widget,
+ cairo_t *cr,
+ gboolean blink)
+{
+ GtkStyle *style;
+ GtkStateType state;
+ GtkAllocation allocation;
+ gdouble wilber_width;
+ gdouble wilber_height;
+ gdouble width;
+ gdouble height;
+ gdouble side;
+ gdouble factor;
+
+ g_return_if_fail (GTK_IS_WIDGET (widget));
+ g_return_if_fail (cr != NULL);
+
+ style = gtk_widget_get_style (widget);
+ state = gtk_widget_get_state (widget);
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ gimp_cairo_wilber_get_size (cr, &wilber_width, &wilber_height);
+
+ wilber_width /= 2;
+ wilber_height /= 2;
+
+ side = MIN (MIN (allocation.width, allocation.height),
+ MAX (allocation.width, allocation.height) / 2);
+
+ width = MAX (wilber_width, side);
+ height = MAX (wilber_height, side);
+
+ factor = MIN (width / wilber_width, height / wilber_height);
+
+ if (! gtk_widget_get_has_window (widget))
+ cairo_translate (cr, allocation.x, allocation.y);
+
+ cairo_scale (cr, factor, factor);
+
+ /* magic factors depend on the image used, everything else is generic
+ */
+ gimp_cairo_wilber_internal (widget, cr,
+ - wilber_width * 0.6,
+ allocation.height / factor - wilber_height * 1.1,
+ factor, 50.0 * G_PI / 180.0);
+
+ cairo_set_source_rgba (cr,
+ style->fg[state].red / 65535.0,
+ style->fg[state].green / 65535.0,
+ style->fg[state].blue / 65535.0,
+ 0.15);
+ cairo_fill (cr);
+
+ if (blink)
+ {
+ gimp_cairo_eyes (widget, cr,
+ - wilber_width * 0.6,
+ allocation.height / factor - wilber_height * 1.1,
+ factor, 50.0 * G_PI / 180.0);
+
+ cairo_set_source_rgba (cr,
+ style->fg[state].red / 65535.0,
+ 0,
+ 0,
+ 1.0);
+ cairo_fill (cr);
+ }
+}
+
+
+/* This string is a path description as found in SVG files. You can
+ * use Inkscape to create the SVG file, then copy the path from it.
+ * It works best if you combine all paths into one. Inkscape has a
+ * function to do that.
+ */
+static const gchar wilber_path[] =
+ "M 509.72445,438.68864 C 501.47706,469.77945 464.95038,491.54566 431.85915,497.74874 C 438.5216,503.01688 442.87782,511.227 442.87782,520.37375 C 442.87783,536.24746 429.95607,549.0223 414.08235,549.0223 C 398.20863,549.0223 385.28688,536.24746 385.28688,520.37375 C 385.28688,511.52403 389.27666,503.61286 395.57098,498.3364 C 359.36952,495.90384 343.70976,463.95812 343.70975,463.95814 L 342.68134,509.64891 C 342.68134,514.35021 342.08391,519.96098 340.18378,528.3072 C 339.84664,527.80364 339.51399,527.33515 339.15537,526.83804 C 330.25511,514.5011 317.25269,507.81431 306.39317,508.76741 C 302.77334,509.08511 299.47017,510.33348 296.54982,512.4403 C 284.86847,520.86757 284.97665,540.94721 296.84366,557.3965 C 306.96274,571.42287 322.32232,578.25612 333.8664,574.73254 C 391.94635,615.17624 532.16931,642.41915 509.72445,438.68864 z M 363.24953,501.1278 C 373.83202,501.12778 382.49549,509.79127 382.49549,520.37375 C 382.49549,530.95624 373.83201,539.47279 363.24953,539.47279 C 352.66706,539.47279 344.1505,530.95624 344.1505,520.37375 C 344.15049,509.79129 352.66706,501.1278 363.24953,501.1278 z M 305.80551,516.1132 C 311.68466,516.11318 316.38344,521.83985 316.38344,528.89486 C 316.38345,535.94982 311.68467,541.67652 305.80551,541.67652 C 299.92636,541.67652 295.08067,535.94987 295.08067,528.89486 C 295.08065,521.83985 299.92636,516.1132 305.80551,516.1132 z M 440.821,552.54828 C 440.821,552.54828 448.7504,554.02388 453.8965,559.45332 C 457.41881,563.16951 457.75208,569.15506 456.98172,577.37703 C 456.21143,573.8833 454.89571,571.76659 453.8965,569.29666 C 443.01388,582.47662 413.42981,583.08929 376.0312,569.88433 C 416.63248,578.00493 437.38806,570.56014 449.48903,561.2163 C 446.29383,557.08917 440.821,552.54828 440.821,552.54828 z ";
+
+static const gchar eyes_path[] =
+ "M 434.64723,524.59684 C 434.64723,532.23974 428.44429,538.44268 420.80139,538.44268 C 413.15849,538.44268 406.95555,532.23974 406.95555,524.59684 C 406.95555,516.95394 413.15849,510.751 420.80139,510.751 C 428.44429,510.751 434.64723,516.95394 434.64723,524.59684 z M 378.00043,522.99931 C 378.00043,527.70264 374.18324,531.51984 369.47991,531.51984 C 364.77658,531.51984 360.95939,527.70264 360.95939,522.99931 C 360.95939,518.29599 364.77658,514.47879 369.47991,514.47879 C 374.18324,514.47879 378.00043,518.29599 378.00043,522.99931 z ";
+
+static cairo_path_t *wilber_cairo_path = NULL;
+static gdouble wilber_x1, wilber_y1;
+static gdouble wilber_x2, wilber_y2;
+
+static cairo_path_t *eyes_cairo_path = NULL;
+static gdouble eyes_x1, eyes_y1;
+static gdouble eyes_x2, eyes_y2;
+
+
+static void parse_path_data (cairo_t *cr,
+ const gchar *data);
+static void wilber_get_extents (cairo_t *cr);
+static void eyes_get_extents (cairo_t *cr);
+
+
+/**
+ * gimp_cairo_wilber:
+ * @cr: Cairo context
+ * @x: x position
+ * @y: y position
+ *
+ * Draw a Wilber path at position @x, @y.
+ */
+void
+gimp_cairo_wilber (cairo_t *cr,
+ gdouble x,
+ gdouble y)
+{
+ gimp_cairo_wilber_internal (NULL, cr, x, y, 1.0, 0.0);
+}
+
+static void
+gimp_cairo_wilber_weak_notify (gpointer data,
+ GObject *widget)
+{
+ cairo_wilber_widgets = g_slist_remove (cairo_wilber_widgets, widget);
+}
+
+static void
+gimp_cairo_wilber_internal (GtkWidget *widget,
+ cairo_t *cr,
+ gdouble x,
+ gdouble y,
+ gdouble factor,
+ gdouble max_eye_angle)
+{
+ wilber_get_extents (cr);
+
+ cairo_save (cr);
+
+ cairo_translate (cr, x - wilber_x1, y - wilber_y1);
+ cairo_append_path (cr, wilber_cairo_path);
+
+ cairo_restore (cr);
+
+ gimp_cairo_eyes (widget, cr, x, y, factor, max_eye_angle);
+
+ if (widget && ! g_slist_find (cairo_wilber_widgets, widget))
+ {
+ cairo_wilber_widgets = g_slist_prepend (cairo_wilber_widgets, widget);
+
+ g_object_weak_ref (G_OBJECT (widget),
+ gimp_cairo_wilber_weak_notify, NULL);
+ }
+}
+
+typedef struct
+{
+ gdouble x;
+ gdouble y;
+ gdouble radius;
+
+ gdouble a;
+ gdouble b;
+ gdouble r;
+} Eye;
+
+static const Eye eyes[2] =
+{
+ { .x = (344.151 + 382.496) / 2.0,
+ .y = (501.128 + 539.473) / 2.0,
+ .radius = (382.496 - 344.151) / 2.0,
+
+ .a = 25.0 * G_PI / 180.0,
+ .b = 24.0 * G_PI / 180.0,
+ .r = 0.475
+ },
+
+ { .x = (385.287 + 442.878) / 2.0,
+ .y = (491.431 + 549.022) / 2.0,
+ .radius = (442.878 - 385.287) / 2.0,
+
+ .a = 34.0 * G_PI / 180.0,
+ .b = 19.0 * G_PI / 180.0,
+ .r = 0.5
+ }
+};
+
+typedef struct
+{
+ gdouble a;
+ gdouble b;
+} EyeState;
+
+typedef struct
+{
+ EyeState eyes[2];
+ gdouble x;
+ gdouble y;
+ gdouble factor;
+ gdouble max_eye_angle;
+ gdouble t;
+ gint timeout_id;
+} EyesState;
+
+static EyesState *
+eyes_state_new (void)
+{
+ EyesState *state = g_slice_new0 (EyesState);
+ gint i;
+
+ for (i = 0; i < 2; i++)
+ {
+ state->eyes[i].a = eyes[i].a;
+ state->eyes[i].b = eyes[i].b;
+ }
+
+ state->t = (gdouble) g_get_monotonic_time () / G_TIME_SPAN_SECOND;
+
+ return state;
+}
+
+static void
+eyes_state_free (EyesState *state)
+{
+ if (state->timeout_id)
+ g_source_remove (state->timeout_id);
+
+ g_slice_free (EyesState, state);
+}
+
+static gboolean
+gimp_cairo_pointer_eyes_timeout (GtkWidget *widget)
+{
+ EyesState *state;
+ gdouble t;
+ gint pointer_x;
+ gint pointer_y;
+ GtkAllocation allocation;
+ GdkWindow *window;
+ gint window_x;
+ gint window_y;
+ gint redraw = 2;
+ gint i;
+
+ state = g_object_get_data (G_OBJECT (widget), "wilber-eyes-state");
+
+ t = (gdouble) g_get_monotonic_time () / G_TIME_SPAN_SECOND;
+
+ gdk_display_get_pointer (gtk_widget_get_display (widget),
+ NULL, &pointer_x, &pointer_y, NULL);
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ window = gtk_widget_get_window (widget);
+
+ if (window)
+ gdk_window_get_origin (window, &window_x, &window_y);
+
+ for (i = 0; i < 2; i++)
+ {
+ const Eye *eye = &eyes[i];
+ gdouble a;
+ gdouble b;
+ gdouble c;
+ GimpVector3 u;
+ GimpVector3 v;
+ GimpVector3 w;
+
+ if (pointer_eyes)
+ {
+ gdouble screen_x;
+ gdouble screen_y;
+ gdouble z = 220.0 * state->factor;
+ gdouble d;
+
+ screen_x = (eye->x + state->x - wilber_x1) * state->factor;
+ screen_y = (eye->y + state->y - wilber_y1) * state->factor;
+
+ if (! gtk_widget_get_has_window (widget))
+ {
+ screen_x += allocation.x;
+ screen_y += allocation.y;
+ }
+
+ if (window)
+ {
+ screen_x += window_x;
+ screen_y += window_y;
+ }
+
+ d = sqrt (SQR (pointer_x - screen_x) + SQR (pointer_y - screen_y));
+ a = atan2 (pointer_y - screen_y, pointer_x - screen_x);
+ b = atan (d / z);
+ b = MIN (b, state->max_eye_angle);
+ }
+ else
+ {
+ a = eyes[i].a;
+ b = eyes[i].b;
+ }
+
+ if (a == state->eyes[i].a && b == state->eyes[i].b)
+ {
+ redraw--;
+
+ continue;
+ }
+
+ u.x = sin (state->eyes[i].b) * cos (state->eyes[i].a);
+ u.y = sin (state->eyes[i].b) * sin (state->eyes[i].a);
+ u.z = cos (state->eyes[i].b);
+
+ v.x = sin (b) * cos (a);
+ v.y = sin (b) * sin (a);
+ v.z = cos (b);
+
+ c = acos (gimp_vector3_inner_product (&u, &v));
+
+ if (c < 1e-2)
+ {
+ state->eyes[i].a = a;
+ state->eyes[i].b = b;
+
+ continue;
+ }
+
+ c *= 1.0 - exp (-(t - state->t) * 15.0);
+
+ w = gimp_vector3_cross_product (&u, &v);
+ w = gimp_vector3_cross_product (&w, &u);
+ gimp_vector3_normalize (&w);
+
+ v.x = u.x * cos (c) + w.x * sin (c);
+ v.y = u.y * cos (c) + w.y * sin (c);
+ v.z = u.z * cos (c) + w.z * sin (c);
+
+ a = atan2 (v.y, v.x);
+ b = acos (v.z);
+
+ state->eyes[i].a = a;
+ state->eyes[i].b = b;
+ }
+
+ state->t = t;
+
+ if (redraw)
+ {
+ state->timeout_id = 0;
+
+ gtk_widget_queue_draw (widget);
+
+ return G_SOURCE_REMOVE;
+ }
+ else if (! pointer_eyes)
+ {
+ state->timeout_id = 0;
+
+ g_object_set_data (G_OBJECT (widget), "wilber-eyes-state", NULL);
+ gtk_widget_queue_draw (widget);
+
+ return G_SOURCE_REMOVE;
+ }
+
+ return G_SOURCE_CONTINUE;
+}
+
+static void
+gimp_cairo_pointer_eyes (GtkWidget *widget,
+ cairo_t *cr,
+ gdouble x,
+ gdouble y,
+ gdouble factor,
+ gdouble max_eye_angle)
+{
+ EyesState *state;
+ gint i;
+
+ state = g_object_get_data (G_OBJECT (widget), "wilber-eyes-state");
+
+ if (! state)
+ {
+ state = eyes_state_new ();
+
+ g_object_set_data_full (G_OBJECT (widget), "wilber-eyes-state", state,
+ (GDestroyNotify) eyes_state_free);
+ }
+
+ for (i = 0; i < 2; i++)
+ {
+ const Eye *eye = &eyes[i];
+ gdouble R = eye->radius;
+ gdouble r = eye->r * eye->radius;
+ gint j;
+
+ cairo_save (cr);
+
+ cairo_translate (cr, eye->x, eye->y);
+ cairo_rotate (cr, state->eyes[i].a);
+
+ for (j = 0; j < 32; j++)
+ {
+ gdouble a = -2.0 * G_PI * j / 32.0;
+ gdouble u = r * cos (a);
+ gdouble v = r * sin (a);
+ gdouble w = sqrt (SQR (R) - SQR (v));
+ gdouble b = asin (u / w);
+
+ b = CLAMP (b + state->eyes[i].b, -G_PI / 2.0, +G_PI / 2.0);
+ u = w * sin (b);
+
+ if (j == 0)
+ cairo_move_to (cr, u, v);
+ else
+ cairo_line_to (cr, u, v);
+ }
+
+ cairo_close_path (cr);
+
+ cairo_restore (cr);
+ }
+
+ state->x = x;
+ state->y = y;
+ state->factor = factor;
+ state->max_eye_angle = max_eye_angle;
+
+ if (! state->timeout_id)
+ {
+ state->timeout_id =
+ g_timeout_add (17,
+ (GSourceFunc) gimp_cairo_pointer_eyes_timeout,
+ widget);
+ }
+}
+
+static void
+gimp_cairo_eyes (GtkWidget *widget,
+ cairo_t *cr,
+ gdouble x,
+ gdouble y,
+ gdouble factor,
+ gdouble max_eye_angle)
+{
+ wilber_get_extents (cr);
+ eyes_get_extents (cr);
+
+ cairo_save (cr);
+
+ cairo_translate (cr, x - wilber_x1, y - wilber_y1);
+ if (widget &&
+ (pointer_eyes ||
+ g_object_get_data (G_OBJECT (widget), "wilber-eyes-state")))
+ {
+ gimp_cairo_pointer_eyes (widget, cr, x, y, factor, max_eye_angle);
+ }
+ else
+ {
+ cairo_append_path (cr, eyes_cairo_path);
+ }
+
+ cairo_restore (cr);
+}
+
+void
+gimp_cairo_wilber_get_size (cairo_t *cr,
+ gdouble *width,
+ gdouble *height)
+{
+ wilber_get_extents (cr);
+
+ *width = wilber_x2 - wilber_x1;
+ *height = wilber_y2 - wilber_y1;
+}
+
+
+static void
+wilber_get_extents (cairo_t *unused)
+{
+ if (! wilber_cairo_path)
+ {
+ cairo_surface_t *s = cairo_image_surface_create (CAIRO_FORMAT_A8, 1, 1);
+ cairo_t *cr = cairo_create (s);
+
+ parse_path_data (cr, wilber_path);
+ cairo_fill_extents (cr, &wilber_x1, &wilber_y1, &wilber_x2, &wilber_y2);
+
+ wilber_cairo_path = cairo_copy_path (cr);
+
+ cairo_destroy (cr);
+ cairo_surface_destroy (s);
+ }
+}
+
+static void
+eyes_get_extents (cairo_t *unused)
+{
+ if (! eyes_cairo_path)
+ {
+ cairo_surface_t *s = cairo_image_surface_create (CAIRO_FORMAT_A8, 1, 1);
+ cairo_t *cr = cairo_create (s);
+
+ parse_path_data (cr, eyes_path);
+ cairo_fill_extents (cr, &eyes_x1, &eyes_y1, &eyes_x2, &eyes_y2);
+
+ eyes_cairo_path = cairo_copy_path (cr);
+
+ cairo_destroy (cr);
+ cairo_surface_destroy (s);
+ }
+}
+
+/**********************************************************/
+/* Below is the code that parses the actual path data. */
+/* */
+/* This code is taken from librsvg and was originally */
+/* written by Raph Levien <raph@artofcode.com> for Gill. */
+/**********************************************************/
+
+typedef struct
+{
+ cairo_t *cr;
+ gdouble cpx, cpy; /* current point */
+ gdouble rpx, rpy; /* reflection point (for 's' and 't' commands) */
+ gchar cmd; /* current command (lowercase) */
+ gint param; /* number of parameters */
+ gboolean rel; /* true if relative coords */
+ gdouble params[7]; /* parameters that have been parsed */
+} ParsePathContext;
+
+
+static void parse_path_default_xy (ParsePathContext *ctx,
+ gint n_params);
+static void parse_path_do_cmd (ParsePathContext *ctx,
+ gboolean final);
+
+
+static void
+parse_path_data (cairo_t *cr,
+ const gchar *data)
+{
+ ParsePathContext ctx;
+
+ gboolean in_num = FALSE;
+ gboolean in_frac = FALSE;
+ gboolean in_exp = FALSE;
+ gboolean exp_wait_sign = FALSE;
+ gdouble val = 0.0;
+ gchar c = 0;
+ gint sign = 0;
+ gint exp = 0;
+ gint exp_sign = 0;
+ gdouble frac = 0.0;
+ gint i;
+
+ memset (&ctx, 0, sizeof (ParsePathContext));
+
+ ctx.cr = cr;
+
+ for (i = 0; ; i++)
+ {
+ c = data[i];
+ if (c >= '0' && c <= '9')
+ {
+ /* digit */
+ if (in_num)
+ {
+ if (in_exp)
+ {
+ exp = (exp * 10) + c - '0';
+ exp_wait_sign = FALSE;
+ }
+ else if (in_frac)
+ val += (frac *= 0.1) * (c - '0');
+ else
+ val = (val * 10) + c - '0';
+ }
+ else
+ {
+ in_num = TRUE;
+ in_frac = FALSE;
+ in_exp = FALSE;
+ exp = 0;
+ exp_sign = 1;
+ exp_wait_sign = FALSE;
+ val = c - '0';
+ sign = 1;
+ }
+ }
+ else if (c == '.')
+ {
+ if (!in_num)
+ {
+ in_num = TRUE;
+ val = 0;
+ }
+ in_frac = TRUE;
+ frac = 1;
+ }
+ else if ((c == 'E' || c == 'e') && in_num)
+ {
+ in_exp = TRUE;
+ exp_wait_sign = TRUE;
+ exp = 0;
+ exp_sign = 1;
+ }
+ else if ((c == '+' || c == '-') && in_exp)
+ {
+ exp_sign = c == '+' ? 1 : -1;
+ }
+ else if (in_num)
+ {
+ /* end of number */
+
+ val *= sign * pow (10, exp_sign * exp);
+ if (ctx.rel)
+ {
+ /* Handle relative coordinates. This switch statement attempts
+ to determine _what_ the coords are relative to. This is
+ underspecified in the 12 Apr working draft. */
+ switch (ctx.cmd)
+ {
+ case 'l':
+ case 'm':
+ case 'c':
+ case 's':
+ case 'q':
+ case 't':
+ /* rule: even-numbered params are x-relative, odd-numbered
+ are y-relative */
+ if ((ctx.param & 1) == 0)
+ val += ctx.cpx;
+ else if ((ctx.param & 1) == 1)
+ val += ctx.cpy;
+ break;
+
+ case 'a':
+ /* rule: sixth and seventh are x and y, rest are not
+ relative */
+ if (ctx.param == 5)
+ val += ctx.cpx;
+ else if (ctx.param == 6)
+ val += ctx.cpy;
+ break;
+ case 'h':
+ /* rule: x-relative */
+ val += ctx.cpx;
+ break;
+ case 'v':
+ /* rule: y-relative */
+ val += ctx.cpy;
+ break;
+ }
+ }
+
+ ctx.params[ctx.param++] = val;
+ parse_path_do_cmd (&ctx, FALSE);
+ in_num = FALSE;
+ }
+
+ if (c == '\0')
+ break;
+ else if ((c == '+' || c == '-') && !exp_wait_sign)
+ {
+ sign = c == '+' ? 1 : -1;
+ val = 0;
+ in_num = TRUE;
+ in_frac = FALSE;
+ in_exp = FALSE;
+ exp = 0;
+ exp_sign = 1;
+ exp_wait_sign = FALSE;
+ }
+ else if (c == 'z' || c == 'Z')
+ {
+ if (ctx.param)
+ parse_path_do_cmd (&ctx, TRUE);
+
+ cairo_close_path (ctx.cr);
+ }
+ else if (c >= 'A' && c <= 'Z' && c != 'E')
+ {
+ if (ctx.param)
+ parse_path_do_cmd (&ctx, TRUE);
+ ctx.cmd = c + 'a' - 'A';
+ ctx.rel = FALSE;
+ }
+ else if (c >= 'a' && c <= 'z' && c != 'e')
+ {
+ if (ctx.param)
+ parse_path_do_cmd (&ctx, TRUE);
+ ctx.cmd = c;
+ ctx.rel = TRUE;
+ }
+ /* else c _should_ be whitespace or , */
+ }
+}
+
+/* supply defaults for missing parameters, assuming relative coordinates
+ are to be interpreted as x,y */
+static void
+parse_path_default_xy (ParsePathContext *ctx,
+ gint n_params)
+{
+ gint i;
+
+ if (ctx->rel)
+ {
+ for (i = ctx->param; i < n_params; i++)
+ {
+ if (i > 2)
+ ctx->params[i] = ctx->params[i - 2];
+ else if (i == 1)
+ ctx->params[i] = ctx->cpy;
+ else if (i == 0)
+ /* we shouldn't get here (ctx->param > 0 as precondition) */
+ ctx->params[i] = ctx->cpx;
+ }
+ }
+ else
+ {
+ for (i = ctx->param; i < n_params; i++)
+ ctx->params[i] = 0.0;
+ }
+}
+
+static void
+parse_path_do_cmd (ParsePathContext *ctx,
+ gboolean final)
+{
+ switch (ctx->cmd)
+ {
+ case 'm':
+ /* moveto */
+ if (ctx->param == 2 || final)
+ {
+ parse_path_default_xy (ctx, 2);
+
+ ctx->cpx = ctx->rpx = ctx->params[0];
+ ctx->cpy = ctx->rpy = ctx->params[1];
+
+ cairo_move_to (ctx->cr, ctx->cpx, ctx->cpy);
+
+ ctx->param = 0;
+ }
+ break;
+
+ case 'l':
+ /* lineto */
+ if (ctx->param == 2 || final)
+ {
+ parse_path_default_xy (ctx, 2);
+
+ ctx->cpx = ctx->rpx = ctx->params[0];
+ ctx->cpy = ctx->rpy = ctx->params[1];
+
+ cairo_line_to (ctx->cr, ctx->cpx, ctx->cpy);
+
+ ctx->param = 0;
+ }
+ break;
+
+ case 'c':
+ /* curveto */
+ if (ctx->param == 6 || final)
+ {
+ gdouble x, y;
+
+ parse_path_default_xy (ctx, 6);
+
+ x = ctx->params[0];
+ y = ctx->params[1];
+ ctx->rpx = ctx->params[2];
+ ctx->rpy = ctx->params[3];
+ ctx->cpx = ctx->params[4];
+ ctx->cpy = ctx->params[5];
+
+ cairo_curve_to (ctx->cr,
+ x, y, ctx->rpx, ctx->rpy, ctx->cpx, ctx->cpy);
+
+ ctx->param = 0;
+ }
+ break;
+
+ case 's':
+ /* smooth curveto */
+ if (ctx->param == 4 || final)
+ {
+ gdouble x, y;
+
+ parse_path_default_xy (ctx, 4);
+
+ x = 2 * ctx->cpx - ctx->rpx;
+ y = 2 * ctx->cpy - ctx->rpy;
+ ctx->rpx = ctx->params[0];
+ ctx->rpy = ctx->params[1];
+ ctx->cpx = ctx->params[2];
+ ctx->cpy = ctx->params[3];
+
+ cairo_curve_to (ctx->cr,
+ x, y, ctx->rpx, ctx->rpy, ctx->cpx, ctx->cpy);
+
+ ctx->param = 0;
+ }
+ break;
+
+ case 'h':
+ /* horizontal lineto */
+ if (ctx->param == 1)
+ {
+ ctx->cpx = ctx->rpx = ctx->params[0];
+
+ cairo_line_to (ctx->cr, ctx->cpx, ctx->cpy);
+
+ ctx->param = 0;
+ }
+ break;
+
+ case 'v':
+ /* vertical lineto */
+ if (ctx->param == 1)
+ {
+ ctx->cpy = ctx->rpy = ctx->params[0];
+
+ cairo_line_to (ctx->cr, ctx->cpx, ctx->cpy);
+
+ ctx->param = 0;
+ }
+ break;
+
+ case 'q':
+ /* quadratic bezier curveto */
+ if (ctx->param == 4 || final)
+ {
+ parse_path_default_xy (ctx, 4);
+
+ ctx->rpx = ctx->params[0];
+ ctx->rpy = ctx->params[1];
+ ctx->cpx = ctx->params[2];
+ ctx->cpy = ctx->params[3];
+
+ g_warning ("quadratic bezier curveto not implemented");
+
+ ctx->param = 0;
+ }
+ break;
+
+ case 't':
+ /* truetype quadratic bezier curveto */
+ if (ctx->param == 2 || final)
+ {
+ parse_path_default_xy (ctx, 2);
+
+ ctx->rpx = 2 * ctx->cpx - ctx->rpx;
+ ctx->rpy = 2 * ctx->cpy - ctx->rpy;
+ ctx->cpx = ctx->params[0];
+ ctx->cpy = ctx->params[1];
+
+ g_warning ("truetype quadratic bezier curveto not implemented");
+
+ ctx->param = 0;
+ }
+ else if (final)
+ {
+ if (ctx->param > 2)
+ {
+ parse_path_default_xy (ctx, 4);
+
+ ctx->rpx = ctx->params[0];
+ ctx->rpy = ctx->params[1];
+ ctx->cpx = ctx->params[2];
+ ctx->cpy = ctx->params[3];
+
+ g_warning ("conicto not implemented");
+ }
+ else
+ {
+ parse_path_default_xy (ctx, 2);
+
+ ctx->cpx = ctx->rpx = ctx->params[0];
+ ctx->cpy = ctx->rpy = ctx->params[1];
+
+ cairo_line_to (ctx->cr, ctx->cpx, ctx->cpy);
+ }
+
+ ctx->param = 0;
+ }
+ break;
+
+ case 'a':
+ if (ctx->param == 7 || final)
+ {
+ ctx->cpx = ctx->rpx = ctx->params[5];
+ ctx->cpy = ctx->rpy = ctx->params[6];
+
+ g_warning ("arcto not implemented");
+
+ ctx->param = 0;
+ }
+ break;
+
+ default:
+ ctx->param = 0;
+ break;
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 15:42:25 +0000