mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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191 lines
5.6 KiB
C
191 lines
5.6 KiB
C
/*
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* GStreamer
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* Copyright (C) 2015 Matthew Waters <matthew@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include "gtkgstwidget.h"
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#include <gst/video/video.h>
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/**
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* SECTION:gtkgstwidget
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* @title: GtkGstWidget
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* @short_description: a #GtkWidget that renders GStreamer video #GstBuffers
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* @see_also: #GtkDrawingArea, #GstBuffer
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*
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* #GtkGstWidget is an #GtkWidget that renders GStreamer video buffers.
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*/
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G_DEFINE_TYPE (GtkGstWidget, gtk_gst_widget, GTK_TYPE_DRAWING_AREA);
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static gboolean
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gtk_gst_widget_draw (GtkWidget * widget, cairo_t * cr)
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{
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GtkGstBaseWidget *gst_widget = (GtkGstBaseWidget *) widget;
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guint widget_width, widget_height;
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cairo_surface_t *surface;
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GstVideoFrame frame;
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widget_width = gtk_widget_get_allocated_width (widget);
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widget_height = gtk_widget_get_allocated_height (widget);
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GTK_GST_BASE_WIDGET_LOCK (gst_widget);
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/* There is not much to optimize in term of redisplay, so simply swap the
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* pending_buffer with the active buffer */
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if (gst_widget->pending_buffer) {
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if (gst_widget->buffer)
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gst_buffer_unref (gst_widget->buffer);
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gst_widget->buffer = gst_widget->pending_buffer;
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gst_widget->pending_buffer = NULL;
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}
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/* failed to map the video frame */
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if (gst_widget->negotiated && gst_widget->buffer
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&& gst_video_frame_map (&frame, &gst_widget->v_info,
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gst_widget->buffer, GST_MAP_READ)) {
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gdouble scale_x = (gdouble) widget_width / gst_widget->display_width;
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gdouble scale_y = (gdouble) widget_height / gst_widget->display_height;
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GstVideoRectangle result;
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cairo_format_t format;
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gst_widget->v_info = frame.info;
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if (frame.info.finfo->format == GST_VIDEO_FORMAT_ARGB ||
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frame.info.finfo->format == GST_VIDEO_FORMAT_BGRA) {
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format = CAIRO_FORMAT_ARGB32;
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} else {
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format = CAIRO_FORMAT_RGB24;
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}
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surface = cairo_image_surface_create_for_data (frame.data[0],
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format, frame.info.width, frame.info.height, frame.info.stride[0]);
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if (gst_widget->force_aspect_ratio) {
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GstVideoRectangle src, dst;
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src.x = 0;
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src.y = 0;
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src.w = gst_widget->display_width;
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src.h = gst_widget->display_height;
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dst.x = 0;
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dst.y = 0;
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dst.w = widget_width;
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dst.h = widget_height;
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gst_video_sink_center_rect (src, dst, &result, TRUE);
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scale_x = scale_y = MIN (scale_x, scale_y);
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} else {
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result.x = 0;
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result.y = 0;
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result.w = widget_width;
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result.h = widget_height;
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}
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if (gst_widget->ignore_alpha) {
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GdkRGBA color = { 0.0, 0.0, 0.0, 1.0 };
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gdk_cairo_set_source_rgba (cr, &color);
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if (result.x > 0) {
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cairo_rectangle (cr, 0, 0, result.x, widget_height);
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cairo_fill (cr);
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}
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if (result.y > 0) {
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cairo_rectangle (cr, 0, 0, widget_width, result.y);
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cairo_fill (cr);
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}
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if (result.w < widget_width) {
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cairo_rectangle (cr, result.x + result.w, 0, widget_width - result.w,
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widget_height);
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cairo_fill (cr);
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}
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if (result.h < widget_height) {
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cairo_rectangle (cr, 0, result.y + result.h, widget_width,
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widget_height - result.h);
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cairo_fill (cr);
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}
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}
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scale_x *= (gdouble) gst_widget->display_width / (gdouble) frame.info.width;
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scale_y *=
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(gdouble) gst_widget->display_height / (gdouble) frame.info.height;
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cairo_translate (cr, result.x, result.y);
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cairo_scale (cr, scale_x, scale_y);
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cairo_rectangle (cr, 0, 0, result.w, result.h);
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cairo_set_source_surface (cr, surface, 0, 0);
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cairo_paint (cr);
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cairo_surface_destroy (surface);
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gst_video_frame_unmap (&frame);
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} else {
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GdkRGBA color;
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if (gst_widget->ignore_alpha) {
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color.red = color.blue = color.green = 0.0;
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color.alpha = 1.0;
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} else {
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gtk_style_context_get_color (gtk_widget_get_style_context (widget),
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GTK_STATE_FLAG_NORMAL, &color);
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}
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gdk_cairo_set_source_rgba (cr, &color);
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cairo_rectangle (cr, 0, 0, widget_width, widget_height);
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cairo_fill (cr);
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}
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GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
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return FALSE;
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}
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static void
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gtk_gst_widget_finalize (GObject * object)
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{
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gtk_gst_base_widget_finalize (object);
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G_OBJECT_CLASS (gtk_gst_widget_parent_class)->finalize (object);
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}
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static void
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gtk_gst_widget_class_init (GtkGstWidgetClass * klass)
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{
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GObjectClass *gobject_klass = (GObjectClass *) klass;
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GtkWidgetClass *widget_klass = (GtkWidgetClass *) klass;
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gtk_gst_base_widget_class_init (GTK_GST_BASE_WIDGET_CLASS (klass));
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gobject_klass->finalize = gtk_gst_widget_finalize;
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widget_klass->draw = gtk_gst_widget_draw;
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}
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static void
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gtk_gst_widget_init (GtkGstWidget * widget)
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{
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gtk_gst_base_widget_init (GTK_GST_BASE_WIDGET (widget));
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}
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GtkWidget *
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gtk_gst_widget_new (void)
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{
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return (GtkWidget *) g_object_new (GTK_TYPE_GST_WIDGET, NULL);
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}
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