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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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677 lines
21 KiB
C
677 lines
21 KiB
C
/*
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* GStreamer
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* Copyright (C) 2008 Filippo Argiolas <filippo.argiolas@gmail.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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-gloverlay
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*
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* Overlay GL video texture with a PNG image
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*
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* <refsect2>
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* <title>Examples</title>
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* |[
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* gst-launch videotestsrc ! "video/x-raw-rgb" ! glupload ! gloverlay location=imagefile ! glimagesink
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* ]|
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* FBO (Frame Buffer Object) is required.
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* </refsect2>
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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 <stdlib.h>
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#include <png.h>
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#include "gstgloverlay.h"
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#include <gstgleffectssources.h>
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#if PNG_LIBPNG_VER >= 10400
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#define int_p_NULL NULL
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#define png_infopp_NULL NULL
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#endif
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#define GST_CAT_DEFAULT gst_gl_overlay_debug
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
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#define DEBUG_INIT(bla) \
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GST_DEBUG_CATEGORY_INIT (gst_gl_overlay_debug, "gloverlay", 0, "gloverlay element");
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GST_BOILERPLATE_FULL (GstGLOverlay, gst_gl_overlay, GstGLFilter,
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GST_TYPE_GL_FILTER, DEBUG_INIT);
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static void gst_gl_overlay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_gl_overlay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_gl_overlay_init_resources (GstGLFilter * filter);
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static void gst_gl_overlay_reset_resources (GstGLFilter * filter);
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static gboolean gst_gl_overlay_filter (GstGLFilter * filter,
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GstGLBuffer * inbuf, GstGLBuffer * outbuf);
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static gboolean gst_gl_overlay_loader (GstGLFilter * filter);
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enum
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{
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PROP_0,
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PROP_LOCATION,
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PROP_XPOS_PNG,
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PROP_YPOS_PNG,
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PROP_SIZE_PNG,
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PROP_XPOS_VIDEO,
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PROP_YPOS_VIDEO,
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PROP_SIZE_VIDEO,
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PROP_VIDEOTOP,
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PROP_ROTATE_PNG,
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PROP_ROTATE_VIDEO,
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PROP_ANGLE_PNG,
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PROP_ANGLE_VIDEO
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};
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/* init resources that need a gl context */
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static void
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gst_gl_overlay_init_gl_resources (GstGLFilter * filter)
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{
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// GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
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}
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/* free resources that need a gl context */
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static void
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gst_gl_overlay_reset_gl_resources (GstGLFilter * filter)
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{
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GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
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glDeleteTextures (1, &overlay->pbuftexture);
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}
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static void
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gst_gl_overlay_base_init (gpointer klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_set_details_simple (element_class,
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"Gstreamer OpenGL Overlay", "Filter/Effect",
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"Overlay GL video texture with a PNG image",
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"Filippo Argiolas <filippo.argiolas@gmail.com>");
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}
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static void
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gst_gl_overlay_class_init (GstGLOverlayClass * klass)
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{
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GObjectClass *gobject_class;
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gobject_class = (GObjectClass *) klass;
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gobject_class->set_property = gst_gl_overlay_set_property;
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gobject_class->get_property = gst_gl_overlay_get_property;
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GST_GL_FILTER_CLASS (klass)->filter = gst_gl_overlay_filter;
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GST_GL_FILTER_CLASS (klass)->display_init_cb =
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gst_gl_overlay_init_gl_resources;
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GST_GL_FILTER_CLASS (klass)->display_reset_cb =
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gst_gl_overlay_reset_gl_resources;
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GST_GL_FILTER_CLASS (klass)->onStart = gst_gl_overlay_init_resources;
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GST_GL_FILTER_CLASS (klass)->onStop = gst_gl_overlay_reset_resources;
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g_object_class_install_property (gobject_class,
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PROP_LOCATION,
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g_param_spec_string ("location",
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"Location of the image",
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"Location of the image", NULL, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_XPOS_PNG,
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g_param_spec_int ("xpos-png",
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"X position of overlay image in percents",
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"X position of overlay image in percents",
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0, 100, 0, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_YPOS_PNG,
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g_param_spec_int ("ypos-png",
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"Y position of overlay image in percents",
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"Y position of overlay image in percents",
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0, 100, 0, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_SIZE_PNG,
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g_param_spec_int ("proportion-png",
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"Relative size of overlay image, in percents",
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"Relative size of iverlay image, in percents",
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0, 100, 0, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_XPOS_VIDEO,
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g_param_spec_int ("xpos-video",
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"X position of overlay video in percents",
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"X position of overlay video in percents",
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0, 100, 0, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_YPOS_VIDEO,
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g_param_spec_int ("ypos-video",
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"Y position of overlay video in percents",
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"Y position of overlay video in percents",
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0, 100, 0, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_SIZE_VIDEO,
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g_param_spec_int ("proportion-video",
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"Relative size of overlay video, in percents",
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"Relative size of iverlay video, in percents",
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0, 100, 0, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_VIDEOTOP,
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g_param_spec_boolean ("video-top",
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"Video-top", "Video is over png image", FALSE, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_ROTATE_PNG,
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g_param_spec_int ("rotate_png",
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"choose rotation axis for the moment only Y axis is implemented",
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"choose rotation axis for the moment only Y axis is implemented",
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0, 3, 0, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_ROTATE_VIDEO,
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g_param_spec_int ("rotate_video",
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"choose rotation axis for the moment only Y axis is implemented",
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"choose rotation axis for the moment only Y axis is implemented",
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0, 3, 0, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_ANGLE_PNG,
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g_param_spec_int ("angle_png",
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"choose angle in axis to choosen between -90 and 90",
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"choose angle in axis to choosen between -90 and 90",
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-90, 90, 0, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_ANGLE_VIDEO,
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g_param_spec_int ("angle_video",
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"choose angle in axis to choosen between -90 and 90",
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"choose angle in axis to choosen between -90 and 90",
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-90, 90, 0, G_PARAM_READWRITE));
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/*
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g_object_class_install_property (gobject_class,
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PROP_STRETCH,
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g_param_spec_boolean ("stretch",
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"Stretch the image to texture size",
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"Stretch the image to fit video texture size",
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TRUE, G_PARAM_READWRITE));
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*/
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}
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static void
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gst_gl_overlay_draw_texture_video_on_png (GstGLOverlay * overlay, GLuint tex)
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{
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GstGLFilter *filter = GST_GL_FILTER (overlay);
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gfloat posx = 0.0;
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gfloat posy = 0.0;
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gfloat size = 0.0;
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gfloat width = (gfloat) filter->width;
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gfloat height = (gfloat) filter->height;
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gfloat ratio = 0.0;
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gfloat translate = 0.0;
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// if (overlay->stretch) {
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// width = (gfloat) overlay->width;
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// height = (gfloat) overlay->height;
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// }
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if (overlay->pbuftexture != 0) {
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size = (overlay->size_png) / 50.0f;
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posx = (overlay->pos_x_png - 50.0f) / 50.0f;
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posx =
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(posx - (size / 2) < -1.00) ? (-1.0f + size / 2) : (posx + (size / 2) >
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1.00) ? (1.0f - size / 2) : posx;
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posy = (overlay->pos_y_png - 50.0f) / 50.0f;
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posy =
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(posy - (size / 2) < -1.00) ? (-1.0f + size / 2) : (posy + (size / 2) >
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1.00) ? (1.0f - size / 2) : posy;
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ratio = ((posx + (size / 2)) - (posx - (size / 2))) * height / width;
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translate = overlay->size_png / 400.0f;
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glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glEnable (GL_TEXTURE_RECTANGLE_ARB);
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glBindTexture (GL_TEXTURE_RECTANGLE_ARB, overlay->pbuftexture);
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glLoadIdentity ();
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glTranslatef (0.0f, translate, -1.0f);
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if (overlay->rotate_png == 2)
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glRotatef (overlay->angle_png, 0, 1, 0);
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glBegin (GL_QUADS);
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glTexCoord3f (0.0f, 0.0f, 0.0f);
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glVertex3f (posx - (size / 2), posy - (size / 2), 0.0f);
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glTexCoord3f (width, 0.0, 0.0);
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glVertex3f (posx + (size / 2), posy - (size / 2), 0.0f);
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glTexCoord3f (width, height, 0.0);
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glVertex3f (posx + (size / 2), posy - (size / 2) + ratio, 0.0f);
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glTexCoord3f (0.0, height, 0.0);
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glVertex3f (posx - (size / 2), posy - (size / 2) + ratio, 0.0f);
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glEnd ();
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}
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size = (overlay->size_video) / 50.0f;
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posx = (overlay->pos_x_video - 50.0f) / 50.0f;
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posx =
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(posx - (size / 2) < -1.00) ? (-1.0f + size / 2) : (posx + (size / 2) >
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1.00) ? (1.0f - size / 2) : posx;
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posy = (overlay->pos_y_video - 50.0f) / 50.0f;
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posy =
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(posy - (size / 2) < -1.00) ? (-1.0f + size / 2) : (posy + (size / 2) >
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1.00) ? (1.0f - size / 2) : posy;
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ratio = ((posx + (size / 2)) - (posx - (size / 2))) * height / width;
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translate = overlay->size_video / 400.0f;
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glActiveTexture (GL_TEXTURE0);
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glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glEnable (GL_TEXTURE_RECTANGLE_ARB);
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glBindTexture (GL_TEXTURE_RECTANGLE_ARB, tex);
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glLoadIdentity ();
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glTranslatef (0.0f, translate, -1.0f);
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if (overlay->rotate_video)
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glRotatef (overlay->angle_video, 0, 1, 0);
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glBegin (GL_QUADS);
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glTexCoord3f (0.0f, 0.0f, 0.0f);
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glVertex3f (posx - (size / 2), posy - (size / 2), 0.0f);
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glTexCoord3f (width, 0.0f, 0.0f);
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glVertex3f (posx + (size / 2), posy - (size / 2), 0.0f);
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glTexCoord3f (width, height, 0.0);
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glVertex3f (posx + (size / 2), posy - (size / 2) + ratio, 0.0f);
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glTexCoord3f (0.0f, height, 0.0f);
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glVertex3f (posx - (size / 2), posy - (size / 2) + ratio, 0.0f);
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glEnd ();
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glFlush ();
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}
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static void
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gst_gl_overlay_draw_texture_png_on_video (GstGLOverlay * overlay, GLuint tex)
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{
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GstGLFilter *filter = GST_GL_FILTER (overlay);
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gfloat posx = 0.0;
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gfloat posy = 0.0;
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gfloat size = 0.0;
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gfloat width = (gfloat) filter->width;
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gfloat height = (gfloat) filter->height;
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gfloat ratio = 0.0;
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gfloat translate = 0.0;
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size = (overlay->size_video) / 50.0f;
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posx = (overlay->pos_x_video - 50.0f) / 50.0f;
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posx =
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(posx - (size / 2) < -1.00) ? (-1.0f + size / 2) : (posx + (size / 2) >
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1.00) ? (1.0f - size / 2) : posx;
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posy = (overlay->pos_y_video - 50.0f) / 50.0f;
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posy =
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(posy - (size / 2) < -1.00) ? (-1.0f + size / 2) : (posy + (size / 2) >
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1.00) ? (1.0f - size / 2) : posy;
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ratio = ((posx + (size / 2)) - (posx - (size / 2))) * height / width;
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translate = overlay->size_video / 400.0f;
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glActiveTexture (GL_TEXTURE0);
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glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glEnable (GL_TEXTURE_RECTANGLE_ARB);
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glBindTexture (GL_TEXTURE_RECTANGLE_ARB, tex);
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glLoadIdentity ();
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glTranslatef (0.0f, translate, -1.0f);
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if (overlay->rotate_video)
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glRotatef (overlay->angle_video, 0, 1, 0);
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glBegin (GL_QUADS);
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glTexCoord3f (0.0f, 0.0f, 0.0f);
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glVertex3f (posx - (size / 2), posy - (size / 2), 0.0f);
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glTexCoord3f (width, 0.0f, 0.0f);
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glVertex3f (posx + (size / 2), posy - (size / 2), 0.0f);
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glTexCoord3f (width, height, 0.0f);
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glVertex3f (posx + (size / 2), posy - (size / 2) + ratio, 0.0f);
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glTexCoord3f (0.0f, height, 0.0f);
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glVertex3f (posx - (size / 2), posy - (size / 2) + ratio, 0.0f);
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glEnd ();
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if (overlay->pbuftexture == 0)
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return;
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// if (overlay->stretch) {
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//width = (gfloat) overlay->width;
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//height = (gfloat) overlay->height;
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// }
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size = (overlay->size_png) / 50.0f;
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posx = (overlay->pos_x_png - 50.0f) / 50.0f;
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posx =
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(posx - (size / 2) < -1.00) ? (-1.0f + size / 2) : (posx + (size / 2) >
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1.00) ? (1.0f - size / 2) : posx;
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posy = (overlay->pos_y_png - 50.0f) / 50.0f;
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posy =
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(posy - (size / 2) < -1.00) ? (-1.0f + size / 2) : (posy + (size / 2) >
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1.00) ? (1.0f - size / 2) : posy;
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ratio = ((posx + (size / 2)) - (posx - (size / 2))) * height / width;
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translate = overlay->size_png / 400.0f;
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glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glEnable (GL_TEXTURE_RECTANGLE_ARB);
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glBindTexture (GL_TEXTURE_RECTANGLE_ARB, overlay->pbuftexture);
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glLoadIdentity ();
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glTranslatef (0.0f, translate, -1.0f);
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if (overlay->rotate_png == 2)
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glRotatef (overlay->angle_png, 0, 1, 0);
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glBegin (GL_QUADS);
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glTexCoord3f (0.0f, 0.0f, 0.0f);
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glVertex3f (posx - (size / 2), posy - (size / 2), 0.0f);
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glTexCoord3f (width, 0.0f, 0.0f);
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glVertex3f (posx + (size / 2), posy - (size / 2), 0.0f);
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glTexCoord3f (width, height, 0.0f);
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glVertex3f (posx + (size / 2), posy - (size / 2) + ratio, 0.0f);
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glTexCoord3f (0.0f, height, 0.0f);
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glVertex3f (posx - (size / 2), posy - (size / 2) + ratio, 0.0f);
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glEnd ();
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glFlush ();
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}
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static void
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gst_gl_overlay_init (GstGLOverlay * overlay, GstGLOverlayClass * klass)
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{
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overlay->location = NULL;
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overlay->pixbuf = NULL;
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overlay->pbuftexture = 0;
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overlay->pbuftexture = 0;
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overlay->width = 0;
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overlay->height = 0;
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overlay->pos_x_png = 0;
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overlay->pos_y_png = 0;
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overlay->size_png = 100;
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overlay->pos_x_video = 0;
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overlay->pos_y_video = 0;
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overlay->size_video = 100;
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overlay->video_top = FALSE;
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overlay->rotate_png = 0;
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overlay->rotate_video = 0;
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overlay->angle_png = 0;
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overlay->angle_video = 0;
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// overlay->stretch = TRUE;
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overlay->pbuf_has_changed = FALSE;
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}
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static void
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gst_gl_overlay_reset_resources (GstGLFilter * filter)
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{
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// GstGLOverlay* overlay = GST_GL_OVERLAY(filter);
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}
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static void
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gst_gl_overlay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstGLOverlay *overlay = GST_GL_OVERLAY (object);
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switch (prop_id) {
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case PROP_LOCATION:
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if (overlay->location != NULL)
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g_free (overlay->location);
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overlay->pbuf_has_changed = TRUE;
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overlay->location = g_value_dup_string (value);
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break;
|
|
case PROP_XPOS_PNG:
|
|
overlay->pos_x_png = g_value_get_int (value);
|
|
break;
|
|
case PROP_YPOS_PNG:
|
|
overlay->pos_y_png = g_value_get_int (value);
|
|
break;
|
|
case PROP_SIZE_PNG:
|
|
overlay->size_png = g_value_get_int (value);
|
|
break;
|
|
case PROP_XPOS_VIDEO:
|
|
overlay->pos_x_video = g_value_get_int (value);
|
|
break;
|
|
case PROP_YPOS_VIDEO:
|
|
overlay->pos_y_video = g_value_get_int (value);
|
|
break;
|
|
case PROP_SIZE_VIDEO:
|
|
overlay->size_video = g_value_get_int (value);
|
|
break;
|
|
case PROP_VIDEOTOP:
|
|
overlay->video_top = g_value_get_boolean (value);
|
|
break;
|
|
case PROP_ROTATE_PNG:
|
|
overlay->rotate_png = g_value_get_int (value);
|
|
break;
|
|
case PROP_ROTATE_VIDEO:
|
|
overlay->rotate_video = g_value_get_int (value);
|
|
break;
|
|
case PROP_ANGLE_PNG:
|
|
overlay->angle_png = g_value_get_int (value);
|
|
break;
|
|
case PROP_ANGLE_VIDEO:
|
|
overlay->angle_video = g_value_get_int (value);
|
|
break;
|
|
/* case PROP_STRETCH:
|
|
overlay->stretch = g_value_get_boolean (value);
|
|
break;
|
|
*/
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_gl_overlay_get_property (GObject * object, guint prop_id,
|
|
GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstGLOverlay *overlay = GST_GL_OVERLAY (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_LOCATION:
|
|
g_value_set_string (value, overlay->location);
|
|
break;
|
|
case PROP_XPOS_PNG:
|
|
g_value_set_int (value, overlay->pos_x_png);
|
|
break;
|
|
case PROP_YPOS_PNG:
|
|
g_value_set_int (value, overlay->pos_y_png);
|
|
break;
|
|
case PROP_SIZE_PNG:
|
|
g_value_set_int (value, overlay->size_png);
|
|
break;
|
|
case PROP_XPOS_VIDEO:
|
|
g_value_set_int (value, overlay->pos_x_video);
|
|
break;
|
|
case PROP_YPOS_VIDEO:
|
|
g_value_set_int (value, overlay->pos_y_video);
|
|
break;
|
|
case PROP_SIZE_VIDEO:
|
|
g_value_set_int (value, overlay->size_video);
|
|
break;
|
|
case PROP_VIDEOTOP:
|
|
g_value_set_boolean (value, overlay->video_top);
|
|
break;
|
|
case PROP_ROTATE_PNG:
|
|
g_value_set_int (value, overlay->rotate_png);
|
|
break;
|
|
case PROP_ROTATE_VIDEO:
|
|
g_value_set_int (value, overlay->rotate_video);
|
|
break;
|
|
case PROP_ANGLE_PNG:
|
|
g_value_set_int (value, overlay->angle_png);
|
|
break;
|
|
case PROP_ANGLE_VIDEO:
|
|
g_value_set_int (value, overlay->angle_video);
|
|
break;
|
|
/* case PROP_STRETCH:
|
|
g_value_set_boolean (value, overlay->stretch);
|
|
break;
|
|
*/
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_gl_overlay_init_resources (GstGLFilter * filter)
|
|
{
|
|
// GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
|
|
}
|
|
|
|
static void
|
|
gst_gl_overlay_callback (gint width, gint height, guint texture, gpointer stuff)
|
|
{
|
|
GstGLOverlay *overlay = GST_GL_OVERLAY (stuff);
|
|
|
|
glMatrixMode (GL_PROJECTION);
|
|
glLoadIdentity ();
|
|
gluPerspective (70.0f, (GLfloat) width / (GLfloat) height, 0.0f, 1000.0f);
|
|
glMatrixMode (GL_MODELVIEW);
|
|
glLoadIdentity ();
|
|
if (overlay->video_top)
|
|
gst_gl_overlay_draw_texture_video_on_png (overlay, texture);
|
|
else
|
|
gst_gl_overlay_draw_texture_png_on_video (overlay, texture);
|
|
}
|
|
|
|
static void
|
|
init_pixbuf_texture (GstGLDisplay * display, gpointer data)
|
|
{
|
|
GstGLOverlay *overlay = GST_GL_OVERLAY (data);
|
|
|
|
if (overlay->pixbuf) {
|
|
|
|
glDeleteTextures (1, &overlay->pbuftexture);
|
|
glGenTextures (1, &overlay->pbuftexture);
|
|
glBindTexture (GL_TEXTURE_RECTANGLE_ARB, overlay->pbuftexture);
|
|
glTexImage2D (GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA,
|
|
(gint) overlay->width, (gint) overlay->height, 0,
|
|
GL_RGBA, GL_UNSIGNED_BYTE, overlay->pixbuf);
|
|
} else
|
|
display->isAlive = FALSE;
|
|
}
|
|
|
|
static gboolean
|
|
gst_gl_overlay_filter (GstGLFilter * filter, GstGLBuffer * inbuf,
|
|
GstGLBuffer * outbuf)
|
|
{
|
|
GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
|
|
|
|
if (overlay->pbuf_has_changed && (overlay->location != NULL)) {
|
|
|
|
if (!gst_gl_overlay_loader (filter))
|
|
overlay->pixbuf = NULL;
|
|
|
|
/* if loader failed then display is turned off */
|
|
gst_gl_display_thread_add (filter->display, init_pixbuf_texture, overlay);
|
|
|
|
if (overlay->pixbuf) {
|
|
free (overlay->pixbuf);
|
|
overlay->pixbuf = NULL;
|
|
}
|
|
|
|
overlay->pbuf_has_changed = FALSE;
|
|
}
|
|
|
|
gst_gl_filter_render_to_target (filter, inbuf->texture, outbuf->texture,
|
|
gst_gl_overlay_callback, overlay);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
user_warning_fn (png_structp png_ptr, png_const_charp warning_msg)
|
|
{
|
|
g_warning ("%s\n", warning_msg);
|
|
}
|
|
|
|
#define LOAD_ERROR(msg) { GST_WARNING ("unable to load %s: %s", overlay->location, msg); return FALSE; }
|
|
|
|
static gboolean
|
|
gst_gl_overlay_loader (GstGLFilter * filter)
|
|
{
|
|
GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
|
|
|
|
png_structp png_ptr;
|
|
png_infop info_ptr;
|
|
guint sig_read = 0;
|
|
png_uint_32 width = 0;
|
|
png_uint_32 height = 0;
|
|
gint bit_depth = 0;
|
|
gint color_type = 0;
|
|
gint interlace_type = 0;
|
|
png_FILE_p fp = NULL;
|
|
guint y = 0;
|
|
guchar **rows = NULL;
|
|
gint filler;
|
|
|
|
if (!filter->display)
|
|
return TRUE;
|
|
|
|
if ((fp = fopen (overlay->location, "rb")) == NULL)
|
|
LOAD_ERROR ("file not found");
|
|
|
|
png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
|
|
|
|
if (png_ptr == NULL) {
|
|
fclose (fp);
|
|
LOAD_ERROR ("failed to initialize the png_struct");
|
|
}
|
|
|
|
png_set_error_fn (png_ptr, NULL, NULL, user_warning_fn);
|
|
|
|
info_ptr = png_create_info_struct (png_ptr);
|
|
if (info_ptr == NULL) {
|
|
fclose (fp);
|
|
png_destroy_read_struct (&png_ptr, png_infopp_NULL, png_infopp_NULL);
|
|
LOAD_ERROR ("failed to initialize the memory for image information");
|
|
}
|
|
|
|
png_init_io (png_ptr, fp);
|
|
|
|
png_set_sig_bytes (png_ptr, sig_read);
|
|
|
|
png_read_info (png_ptr, info_ptr);
|
|
|
|
png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
|
|
&interlace_type, int_p_NULL, int_p_NULL);
|
|
|
|
if (color_type == PNG_COLOR_TYPE_RGB) {
|
|
filler = 0xff;
|
|
png_set_filler (png_ptr, filler, PNG_FILLER_AFTER);
|
|
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
|
|
}
|
|
|
|
if (color_type != PNG_COLOR_TYPE_RGB_ALPHA) {
|
|
fclose (fp);
|
|
png_destroy_read_struct (&png_ptr, png_infopp_NULL, png_infopp_NULL);
|
|
LOAD_ERROR ("color type is not rgb");
|
|
}
|
|
|
|
overlay->width = width;
|
|
overlay->height = height;
|
|
|
|
overlay->pixbuf = (guchar *) malloc (sizeof (guchar) * width * height * 4);
|
|
|
|
rows = (guchar **) malloc (sizeof (guchar *) * height);
|
|
|
|
for (y = 0; y < height; ++y)
|
|
rows[y] = (guchar *) (overlay->pixbuf + y * width * 4);
|
|
|
|
png_read_image (png_ptr, rows);
|
|
|
|
free (rows);
|
|
|
|
png_read_end (png_ptr, info_ptr);
|
|
png_destroy_read_struct (&png_ptr, &info_ptr, png_infopp_NULL);
|
|
fclose (fp);
|
|
|
|
return TRUE;
|
|
}
|