1 /*
2 * GStreamer
3 * Copyright (C) 2015 Matthew Waters <matthew@centricular.com>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21 #ifdef HAVE_CONFIG_H
22 #include "config.h"
23 #endif
24
25 #include <stdio.h>
26
27 #include "gtkgstwidget.h"
28 #include <gst/video/video.h>
29
30 /**
31 * SECTION:gtkgstwidget
32 * @title: GtkGstWidget
33 * @short_description: a #GtkWidget that renders GStreamer video #GstBuffers
34 * @see_also: #GtkDrawingArea, #GstBuffer
35 *
36 * #GtkGstWidget is an #GtkWidget that renders GStreamer video buffers.
37 */
38
39 G_DEFINE_TYPE (GtkGstWidget, gtk_gst_widget, GTK_TYPE_DRAWING_AREA);
40
41 static gboolean
gtk_gst_widget_draw(GtkWidget * widget,cairo_t * cr)42 gtk_gst_widget_draw (GtkWidget * widget, cairo_t * cr)
43 {
44 GtkGstBaseWidget *gst_widget = (GtkGstBaseWidget *) widget;
45 guint widget_width, widget_height;
46 cairo_surface_t *surface;
47 GstVideoFrame frame;
48
49 widget_width = gtk_widget_get_allocated_width (widget);
50 widget_height = gtk_widget_get_allocated_height (widget);
51
52 GTK_GST_BASE_WIDGET_LOCK (gst_widget);
53
54 /* There is not much to optimize in term of redisplay, so simply swap the
55 * pending_buffer with the active buffer */
56 if (gst_widget->pending_buffer) {
57 if (gst_widget->buffer)
58 gst_buffer_unref (gst_widget->buffer);
59 gst_widget->buffer = gst_widget->pending_buffer;
60 gst_widget->pending_buffer = NULL;
61 }
62
63 /* failed to map the video frame */
64 if (gst_widget->negotiated && gst_widget->buffer
65 && gst_video_frame_map (&frame, &gst_widget->v_info,
66 gst_widget->buffer, GST_MAP_READ)) {
67 gdouble scale_x = (gdouble) widget_width / gst_widget->display_width;
68 gdouble scale_y = (gdouble) widget_height / gst_widget->display_height;
69 GstVideoRectangle result;
70 cairo_format_t format;
71
72 gst_widget->v_info = frame.info;
73 if (frame.info.finfo->format == GST_VIDEO_FORMAT_ARGB ||
74 frame.info.finfo->format == GST_VIDEO_FORMAT_BGRA) {
75 format = CAIRO_FORMAT_ARGB32;
76 } else {
77 format = CAIRO_FORMAT_RGB24;
78 }
79
80 surface = cairo_image_surface_create_for_data (frame.data[0],
81 format, frame.info.width, frame.info.height, frame.info.stride[0]);
82
83 if (gst_widget->force_aspect_ratio) {
84 GstVideoRectangle src, dst;
85
86 src.x = 0;
87 src.y = 0;
88 src.w = gst_widget->display_width;
89 src.h = gst_widget->display_height;
90
91 dst.x = 0;
92 dst.y = 0;
93 dst.w = widget_width;
94 dst.h = widget_height;
95
96 gst_video_sink_center_rect (src, dst, &result, TRUE);
97
98 scale_x = scale_y = MIN (scale_x, scale_y);
99 } else {
100 result.x = 0;
101 result.y = 0;
102 result.w = widget_width;
103 result.h = widget_height;
104 }
105
106 if (gst_widget->ignore_alpha) {
107 GdkRGBA color = { 0.0, 0.0, 0.0, 1.0 };
108
109 gdk_cairo_set_source_rgba (cr, &color);
110 if (result.x > 0) {
111 cairo_rectangle (cr, 0, 0, result.x, widget_height);
112 cairo_fill (cr);
113 }
114 if (result.y > 0) {
115 cairo_rectangle (cr, 0, 0, widget_width, result.y);
116 cairo_fill (cr);
117 }
118 if (result.w < widget_width) {
119 cairo_rectangle (cr, result.x + result.w, 0, widget_width - result.w,
120 widget_height);
121 cairo_fill (cr);
122 }
123 if (result.h < widget_height) {
124 cairo_rectangle (cr, 0, result.y + result.h, widget_width,
125 widget_height - result.h);
126 cairo_fill (cr);
127 }
128 }
129
130 scale_x *= (gdouble) gst_widget->display_width / (gdouble) frame.info.width;
131 scale_y *=
132 (gdouble) gst_widget->display_height / (gdouble) frame.info.height;
133
134 cairo_translate (cr, result.x, result.y);
135 cairo_scale (cr, scale_x, scale_y);
136 cairo_rectangle (cr, 0, 0, result.w, result.h);
137 cairo_set_source_surface (cr, surface, 0, 0);
138 cairo_paint (cr);
139
140 cairo_surface_destroy (surface);
141
142 gst_video_frame_unmap (&frame);
143 } else {
144 GdkRGBA color;
145
146 if (gst_widget->ignore_alpha) {
147 color.red = color.blue = color.green = 0.0;
148 color.alpha = 1.0;
149 } else {
150 gtk_style_context_get_color (gtk_widget_get_style_context (widget),
151 GTK_STATE_FLAG_NORMAL, &color);
152 }
153 gdk_cairo_set_source_rgba (cr, &color);
154 cairo_rectangle (cr, 0, 0, widget_width, widget_height);
155 cairo_fill (cr);
156 }
157
158 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
159 return FALSE;
160 }
161
162 static void
gtk_gst_widget_finalize(GObject * object)163 gtk_gst_widget_finalize (GObject * object)
164 {
165 gtk_gst_base_widget_finalize (object);
166
167 G_OBJECT_CLASS (gtk_gst_widget_parent_class)->finalize (object);
168 }
169
170 static void
gtk_gst_widget_class_init(GtkGstWidgetClass * klass)171 gtk_gst_widget_class_init (GtkGstWidgetClass * klass)
172 {
173 GObjectClass *gobject_klass = (GObjectClass *) klass;
174 GtkWidgetClass *widget_klass = (GtkWidgetClass *) klass;
175
176 gtk_gst_base_widget_class_init (GTK_GST_BASE_WIDGET_CLASS (klass));
177 gobject_klass->finalize = gtk_gst_widget_finalize;
178 widget_klass->draw = gtk_gst_widget_draw;
179 }
180
181 static void
gtk_gst_widget_init(GtkGstWidget * widget)182 gtk_gst_widget_init (GtkGstWidget * widget)
183 {
184 gtk_gst_base_widget_init (GTK_GST_BASE_WIDGET (widget));
185 }
186
187 GtkWidget *
gtk_gst_widget_new(void)188 gtk_gst_widget_new (void)
189 {
190 return (GtkWidget *) g_object_new (GTK_TYPE_GST_WIDGET, NULL);
191 }
192