| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright © 2016 Red Hat, Inc. | ||
| 3 | * | ||
| 4 | * This program is free software; you can redistribute it and/or modify | ||
| 5 | * it under the terms of the GNU General Public License as published by | ||
| 6 | * the Free Software Foundation; either version 2 of the License, or | ||
| 7 | * (at your option) any later version. | ||
| 8 | * | ||
| 9 | * This program is distributed in the hope that it will be useful, | ||
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 12 | * GNU General Public License for more details. | ||
| 13 | * | ||
| 14 | * You should have received a copy of the GNU General Public License | ||
| 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | ||
| 16 | * | ||
| 17 | * Author: Carlos Garnacho <carlosg@gnome.org> | ||
| 18 | */ | ||
| 19 | |||
| 20 | #include "config.h" | ||
| 21 | #include <cairo/cairo.h> | ||
| 22 | #include "cc-drawing-area.h" | ||
| 23 | |||
| 24 | typedef struct _CcDrawingArea CcDrawingArea; | ||
| 25 | |||
| 26 | struct _CcDrawingArea { | ||
| 27 | GtkDrawingArea parent; | ||
| 28 | GtkGesture *stylus_gesture; | ||
| 29 | cairo_surface_t *surface; | ||
| 30 | cairo_t *cr; | ||
| 31 | }; | ||
| 32 | |||
| 33 | ✗ | G_DEFINE_TYPE (CcDrawingArea, cc_drawing_area, GTK_TYPE_DRAWING_AREA) | |
| 34 | |||
| 35 | static void | ||
| 36 | ✗ | ensure_drawing_surface (CcDrawingArea *area, | |
| 37 | gint width, | ||
| 38 | gint height) | ||
| 39 | { | ||
| 40 | ✗ | if (!area->surface || | |
| 41 | ✗ | cairo_image_surface_get_width (area->surface) != width || | |
| 42 | ✗ | cairo_image_surface_get_height (area->surface) != height) { | |
| 43 | cairo_surface_t *surface; | ||
| 44 | |||
| 45 | ✗ | surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, | |
| 46 | width, height); | ||
| 47 | ✗ | if (area->surface) { | |
| 48 | cairo_t *cr; | ||
| 49 | |||
| 50 | ✗ | cr = cairo_create (surface); | |
| 51 | ✗ | cairo_set_source_surface (cr, area->surface, 0, 0); | |
| 52 | ✗ | cairo_paint (cr); | |
| 53 | |||
| 54 | ✗ | cairo_surface_destroy (area->surface); | |
| 55 | ✗ | cairo_destroy (area->cr); | |
| 56 | ✗ | cairo_destroy (cr); | |
| 57 | } | ||
| 58 | |||
| 59 | ✗ | area->surface = surface; | |
| 60 | ✗ | area->cr = cairo_create (surface); | |
| 61 | } | ||
| 62 | ✗ | } | |
| 63 | |||
| 64 | static void | ||
| 65 | ✗ | cc_drawing_area_map (GtkWidget *widget) | |
| 66 | { | ||
| 67 | GtkAllocation allocation; | ||
| 68 | |||
| 69 | ✗ | GTK_WIDGET_CLASS (cc_drawing_area_parent_class)->map (widget); | |
| 70 | |||
| 71 | ✗ | gtk_widget_get_allocation (widget, &allocation); | |
| 72 | ✗ | ensure_drawing_surface (CC_DRAWING_AREA (widget), | |
| 73 | allocation.width, allocation.height); | ||
| 74 | ✗ | } | |
| 75 | |||
| 76 | static void | ||
| 77 | ✗ | cc_drawing_area_unmap (GtkWidget *widget) | |
| 78 | { | ||
| 79 | ✗ | CcDrawingArea *area = CC_DRAWING_AREA (widget); | |
| 80 | |||
| 81 | ✗ | if (area->cr) { | |
| 82 | ✗ | cairo_destroy (area->cr); | |
| 83 | ✗ | area->cr = NULL; | |
| 84 | } | ||
| 85 | |||
| 86 | ✗ | if (area->surface) { | |
| 87 | ✗ | cairo_surface_destroy (area->surface); | |
| 88 | ✗ | area->surface = NULL; | |
| 89 | } | ||
| 90 | |||
| 91 | ✗ | GTK_WIDGET_CLASS (cc_drawing_area_parent_class)->unmap (widget); | |
| 92 | ✗ | } | |
| 93 | |||
| 94 | static void | ||
| 95 | ✗ | draw_cb (GtkDrawingArea *drawing_area, | |
| 96 | cairo_t *cr, | ||
| 97 | gint width, | ||
| 98 | gint height, | ||
| 99 | gpointer user_data) | ||
| 100 | { | ||
| 101 | ✗ | CcDrawingArea *area = CC_DRAWING_AREA (drawing_area); | |
| 102 | |||
| 103 | ✗ | ensure_drawing_surface (area, width, height); | |
| 104 | |||
| 105 | ✗ | cairo_set_source_rgb (cr, 1, 1, 1); | |
| 106 | ✗ | cairo_paint (cr); | |
| 107 | |||
| 108 | ✗ | cairo_set_source_surface (cr, area->surface, 0, 0); | |
| 109 | ✗ | cairo_paint (cr); | |
| 110 | |||
| 111 | ✗ | cairo_set_source_rgb (cr, 0.6, 0.6, 0.6); | |
| 112 | ✗ | cairo_rectangle (cr, 0, 0, width, height); | |
| 113 | ✗ | cairo_stroke (cr); | |
| 114 | ✗ | } | |
| 115 | |||
| 116 | static void | ||
| 117 | ✗ | stylus_down_cb (CcDrawingArea *area, | |
| 118 | double x, | ||
| 119 | double y) | ||
| 120 | { | ||
| 121 | ✗ | cairo_new_path (area->cr); | |
| 122 | ✗ | } | |
| 123 | |||
| 124 | static void | ||
| 125 | ✗ | stylus_motion_cb (CcDrawingArea *area, | |
| 126 | double x, | ||
| 127 | double y, | ||
| 128 | GtkGestureStylus *gesture) | ||
| 129 | { | ||
| 130 | GdkDeviceTool *tool; | ||
| 131 | gdouble pressure; | ||
| 132 | |||
| 133 | ✗ | tool = gtk_gesture_stylus_get_device_tool (gesture); | |
| 134 | ✗ | gtk_gesture_stylus_get_axis (gesture, | |
| 135 | GDK_AXIS_PRESSURE, | ||
| 136 | &pressure); | ||
| 137 | |||
| 138 | ✗ | if (gdk_device_tool_get_tool_type (tool) == GDK_DEVICE_TOOL_TYPE_ERASER) { | |
| 139 | ✗ | cairo_set_line_width (area->cr, 10 * pressure); | |
| 140 | ✗ | cairo_set_operator (area->cr, CAIRO_OPERATOR_DEST_OUT); | |
| 141 | } else { | ||
| 142 | ✗ | cairo_set_line_width (area->cr, 4 * pressure); | |
| 143 | ✗ | cairo_set_operator (area->cr, CAIRO_OPERATOR_SATURATE); | |
| 144 | } | ||
| 145 | |||
| 146 | ✗ | cairo_set_source_rgba (area->cr, 0, 0, 0, pressure); | |
| 147 | ✗ | cairo_line_to (area->cr, x, y); | |
| 148 | ✗ | cairo_stroke (area->cr); | |
| 149 | |||
| 150 | ✗ | cairo_move_to (area->cr, x, y); | |
| 151 | |||
| 152 | ✗ | gtk_widget_queue_draw (GTK_WIDGET (area)); | |
| 153 | ✗ | } | |
| 154 | |||
| 155 | static void | ||
| 156 | ✗ | cc_drawing_area_class_init (CcDrawingAreaClass *klass) | |
| 157 | { | ||
| 158 | ✗ | GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass); | |
| 159 | |||
| 160 | ✗ | widget_class->map = cc_drawing_area_map; | |
| 161 | ✗ | widget_class->unmap = cc_drawing_area_unmap; | |
| 162 | ✗ | } | |
| 163 | |||
| 164 | static void | ||
| 165 | ✗ | cc_drawing_area_init (CcDrawingArea *area) | |
| 166 | { | ||
| 167 | ✗ | gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (area), draw_cb, NULL, NULL); | |
| 168 | ✗ | area->stylus_gesture = gtk_gesture_stylus_new (); | |
| 169 | ✗ | g_signal_connect_swapped (area->stylus_gesture, "down", | |
| 170 | G_CALLBACK (stylus_down_cb), area); | ||
| 171 | ✗ | g_signal_connect_swapped (area->stylus_gesture, "motion", | |
| 172 | G_CALLBACK (stylus_motion_cb), area); | ||
| 173 | ✗ | gtk_widget_add_controller (GTK_WIDGET (area), | |
| 174 | ✗ | GTK_EVENT_CONTROLLER (area->stylus_gesture)); | |
| 175 | ✗ | } | |
| 176 | |||
| 177 | GtkWidget * | ||
| 178 | ✗ | cc_drawing_area_new (void) | |
| 179 | { | ||
| 180 | ✗ | return g_object_new (CC_TYPE_DRAWING_AREA, NULL); | |
| 181 | } | ||
| 182 |