gstreamer/gst/gl/gstgloverlay.c

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/*
* GStreamer
* Copyright (C) 2008 Filippo Argiolas <filippo.argiolas@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
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/**
* SECTION:element-gloverlay
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*
* Overlay GL video texture with a PNG image
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*
* <refsect2>
* <title>Examples</title>
* |[
* gst-launch videotestsrc ! "video/x-raw-rgb" ! glupload ! gloverlay location=imagefile ! glimagesink
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* ]|
* FBO (Frame Buffer Object) is required.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <jpeglib.h>
#include <png.h>
#include "gstgloverlay.h"
#include <gstgleffectssources.h>
#if PNG_LIBPNG_VER >= 10400
#define int_p_NULL NULL
#define png_infopp_NULL NULL
#endif
#define GST_CAT_DEFAULT gst_gl_overlay_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define DEBUG_INIT \
GST_DEBUG_CATEGORY_INIT (gst_gl_overlay_debug, "gloverlay", 0, "gloverlay element");
G_DEFINE_TYPE_WITH_CODE (GstGLOverlay, gst_gl_overlay, GST_TYPE_GL_FILTER,
DEBUG_INIT);
static gboolean gst_gl_overlay_set_caps (GstGLFilter * filter,
GstCaps * incaps, GstCaps * outcaps);
static void gst_gl_overlay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_gl_overlay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_gl_overlay_init_resources (GstGLFilter * filter);
static void gst_gl_overlay_reset_resources (GstGLFilter * filter);
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static gboolean gst_gl_overlay_filter_texture (GstGLFilter * filter,
guint in_tex, guint out_tex);
static gint gst_gl_overlay_load_png (GstGLFilter * filter);
static gint gst_gl_overlay_load_jpeg (GstGLFilter * filter);
enum
{
PROP_0,
PROP_LOCATION,
PROP_XPOS_PNG,
PROP_YPOS_PNG,
PROP_SIZE_PNG,
PROP_XPOS_VIDEO,
PROP_YPOS_VIDEO,
PROP_SIZE_VIDEO,
PROP_VIDEOTOP,
PROP_ROTATE_PNG,
PROP_ROTATE_VIDEO,
PROP_ANGLE_PNG,
PROP_ANGLE_VIDEO,
PROP_RATIO_VIDEO
};
/* init resources that need a gl context */
static void
gst_gl_overlay_init_gl_resources (GstGLFilter * filter)
{
// GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
}
/* free resources that need a gl context */
static void
gst_gl_overlay_reset_gl_resources (GstGLFilter * filter)
{
GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
glDeleteTextures (1, &overlay->pbuftexture);
}
static void
gst_gl_overlay_class_init (GstGLOverlayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property = gst_gl_overlay_set_property;
gobject_class->get_property = gst_gl_overlay_get_property;
GST_GL_FILTER_CLASS (klass)->set_caps = gst_gl_overlay_set_caps;
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GST_GL_FILTER_CLASS (klass)->filter_texture = gst_gl_overlay_filter_texture;
GST_GL_FILTER_CLASS (klass)->display_init_cb =
gst_gl_overlay_init_gl_resources;
GST_GL_FILTER_CLASS (klass)->display_reset_cb =
gst_gl_overlay_reset_gl_resources;
GST_GL_FILTER_CLASS (klass)->onStart = gst_gl_overlay_init_resources;
GST_GL_FILTER_CLASS (klass)->onStop = gst_gl_overlay_reset_resources;
g_object_class_install_property (gobject_class,
PROP_LOCATION,
g_param_spec_string ("location",
"Location of the image",
"Location of the image", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_XPOS_PNG,
g_param_spec_int ("xpos-png",
"X position of overlay image in percents",
"X position of overlay image in percents",
0, 100, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_YPOS_PNG,
g_param_spec_int ("ypos-png",
"Y position of overlay image in percents",
"Y position of overlay image in percents",
0, 100, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_SIZE_PNG,
g_param_spec_int ("proportion-png",
"Relative size of overlay image, in percents",
"Relative size of iverlay image, in percents",
0, 100, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_XPOS_VIDEO,
g_param_spec_int ("xpos-video",
"X position of overlay video in percents",
"X position of overlay video in percents",
0, 100, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_YPOS_VIDEO,
g_param_spec_int ("ypos-video",
"Y position of overlay video in percents",
"Y position of overlay video in percents",
0, 100, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_SIZE_VIDEO,
g_param_spec_int ("proportion-video",
"Relative size of overlay video, in percents",
"Relative size of iverlay video, in percents",
0, 100, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_VIDEOTOP,
g_param_spec_boolean ("video-top",
"Video-top", "Video is over png image", FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_ROTATE_PNG,
g_param_spec_int ("rotate-png",
"choose rotation axis for the moment only Y axis is implemented",
"choose rotation axis for the moment only Y axis is implemented",
0, 3, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_ROTATE_VIDEO,
g_param_spec_int ("rotate-video",
"choose rotation axis for the moment only Y axis is implemented",
"choose rotation axis for the moment only Y axis is implemented",
0, 3, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_ANGLE_PNG,
g_param_spec_int ("angle-png",
"choose angle in axis to choosen between -90 and 90",
"choose angle in axis to choosen between -90 and 90",
-90, 90, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_ANGLE_VIDEO,
g_param_spec_int ("angle-video",
"choose angle in axis to choosen between -90 and 90",
"choose angle in axis to choosen between -90 and 90",
-90, 90, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_RATIO_VIDEO,
g_param_spec_int ("ratio-video",
"choose ratio video between 0 and 3\n \t\t\t0 : Default ratio\n\t\t\t1 : 4 / 3\n\t\t\t2 : 16 / 9\n\t\t\t3 : 16 / 10",
"choose ratio video between 0 and 3\n \t\t\t0 : Default ratio\n\t\t\t1 : 4 / 3\n\t\t\t2 : 16 / 9\n\t\t\t3 : 16 / 10",
0, 3, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_metadata (element_class,
"Gstreamer OpenGL Overlay", "Filter/Effect",
"Overlay GL video texture with a PNG image",
"Filippo Argiolas <filippo.argiolas@gmail.com>");
/*
g_object_class_install_property (gobject_class,
PROP_STRETCH,
g_param_spec_boolean ("stretch",
"Stretch the image to texture size",
"Stretch the image to fit video texture size",
TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
*/
}
static void
gst_gl_overlay_calc_ratio_video (GstGLOverlay * o, gfloat * video_ratio_w,
gfloat * video_ratio_h)
{
if (o->ratio_video == 0) {
o->ratio_texture = (gfloat) o->ratio_window;
*video_ratio_w = (gfloat) o->width_window;
*video_ratio_h = (gfloat) o->height_window;
} else if (o->ratio_video == 1) {
o->ratio_texture = (gfloat) 1.33;
*video_ratio_w = 4.0;
*video_ratio_h = 3.0;
} else if (o->ratio_video == 2) {
o->ratio_texture = (gfloat) 1.77;
*video_ratio_w = 16.0;
*video_ratio_h = 9.0;
} else {
o->ratio_texture = (gfloat) 1.6;
*video_ratio_w = 16.0;
*video_ratio_h = 10.0;
}
}
static void
gst_gl_overlay_init_texture (GstGLOverlay * o, GLuint tex, int flag)
{
if (flag == 0 && o->type_file == 2) {
glEnable (GL_TEXTURE_2D);
glBindTexture (GL_TEXTURE_2D, tex);
} else {
glEnable (GL_TEXTURE_RECTANGLE_ARB);
glBindTexture (GL_TEXTURE_RECTANGLE_ARB, tex);
}
}
static void
gst_gl_overlay_draw (GstGLOverlay * o, int flag)
{
float y = 0.0f;
float width = 0.0f;
float height = 0.0f;
if (flag == 1) {
width = o->width_window;
height = o->height_window;
} else if (flag == 0 && o->type_file == 1) {
width = (gfloat) o->width;
height = (gfloat) o->height;
} else if (flag == 0 && o->type_file == 2) {
width = 1.0f;
height = 1.0f;
}
y = (o->type_file == 2 && flag == 0 ? o->ratio_y : -o->ratio_y) + o->posy;
glTexCoord3f (0.0f, 0.0f, 0.0f);
glVertex3f (-o->ratio_x + o->posx, y, 0.0f);
glTexCoord3f (width, 0.0f, 0.0f);
glVertex3f (o->ratio_x + o->posx, y, 0.0f);
glTexCoord3f (width, height, 0.0f);
y = (o->type_file == 2 && flag == 0 ? -o->ratio_y : o->ratio_y) + o->posy;
glVertex3f (o->ratio_x + o->posx, y, 0.0f);
glTexCoord3f (0.0f, height, 0.0f);
glVertex3f (-o->ratio_x + o->posx, y, 0.0f);
}
static void
gst_gl_overlay_calc_proportion (GstGLOverlay * o, int flag, float size_texture,
float width, float height)
{
if ((1.59f < o->ratio_window && o->ratio_window < 1.61f
&& 1.77f < o->ratio_texture && o->ratio_texture < 1.78f)
|| (1.3f < o->ratio_window && o->ratio_window < 1.34f
&& ((1.7f < o->ratio_texture && o->ratio_texture < 1.78f)
|| (1.59f < o->ratio_texture && o->ratio_texture < 1.61f)))) {
o->ratio_x = o->ratio_window * (gfloat) size_texture / 100.0f;
o->ratio_y =
(o->ratio_window / width) * height * (gfloat) size_texture / 100.0f;
} else {
o->ratio_x = o->ratio_texture * (gfloat) size_texture / 100.0f;
o->ratio_y = 1.0f * size_texture / 100.0f;
}
o->posx =
((o->ratio_window - o->ratio_x) * ((flag ==
1 ? o->pos_x_video : o->pos_x_png) - 50.0f) / 50.0f);
o->posy =
(1.0f - o->ratio_y) * (((flag ==
1 ? o->pos_y_video : o->pos_y_png) - 50.0f) / 50.0f);
}
static void
gst_gl_overlay_load_texture (GstGLOverlay * o, GLuint tex, int flag)
{
gfloat video_ratio_w;
gfloat video_ratio_h;
o->ratio_window = (gfloat) o->width_window / (gfloat) o->height_window;
glMatrixMode (GL_MODELVIEW);
glActiveTexture (GL_TEXTURE0);
gst_gl_overlay_init_texture (o, tex, flag);
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable (GL_BLEND);
glTranslatef (0.0f, 0.0f, -1.43f);
glScalef (1.0, 1.0, 1.0);
if (flag == 1) {
if (o->rotate_video)
glRotatef (o->angle_video, 0, 1, 0);
gst_gl_overlay_calc_ratio_video (o, &video_ratio_w, &video_ratio_h);
gst_gl_overlay_calc_proportion (o, flag, o->size_video, video_ratio_w,
video_ratio_h);
} else {
o->ratio_texture = (gfloat) o->width / (gfloat) o->height;
if (o->rotate_png == 2)
glRotatef (o->angle_png, 0, 1, 0);
gst_gl_overlay_calc_proportion (o, flag, o->size_png, (gfloat) o->width,
(gfloat) o->height);
}
glBegin (GL_POLYGON);
gst_gl_overlay_draw (o, flag);
glEnd ();
if (flag == 1)
glDisable (GL_TEXTURE_RECTANGLE_ARB);
}
static void
gst_gl_overlay_init (GstGLOverlay * overlay)
{
overlay->location = NULL;
overlay->pixbuf = NULL;
overlay->pbuftexture = 0;
overlay->pbuftexture = 0;
overlay->width = 0;
overlay->height = 0;
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overlay->pos_x_png = 0;
overlay->pos_y_png = 0;
overlay->size_png = 100;
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overlay->pos_x_video = 0;
overlay->pos_y_video = 0;
overlay->size_video = 100;
overlay->video_top = FALSE;
overlay->rotate_png = 0;
overlay->rotate_video = 0;
overlay->angle_png = 0;
overlay->angle_video = 0;
overlay->ratio_video = 0;
// overlay->stretch = TRUE;
overlay->pbuf_has_changed = FALSE;
}
static void
gst_gl_overlay_reset_resources (GstGLFilter * filter)
{
// GstGLOverlay* overlay = GST_GL_OVERLAY(filter);
}
static void
gst_gl_overlay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLOverlay *overlay = GST_GL_OVERLAY (object);
switch (prop_id) {
case PROP_LOCATION:
if (overlay->location != NULL)
g_free (overlay->location);
overlay->pbuf_has_changed = TRUE;
overlay->location = g_value_dup_string (value);
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_RATIO_VIDEO:
overlay->ratio_video = (gfloat) 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_RATIO_VIDEO:
g_value_set_int (value, (gint) overlay->ratio_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 gboolean
gst_gl_overlay_set_caps (GstGLFilter * filter, GstCaps * incaps,
GstCaps * outcaps)
{
GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
GstStructure *s = gst_caps_get_structure (incaps, 0);
gint width = 0;
gint height = 0;
gst_structure_get_int (s, "width", &width);
gst_structure_get_int (s, "height", &height);
overlay->width_window = (gfloat) width;
overlay->height_window = (gfloat) height;
return TRUE;
}
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) overlay->width_window / (GLfloat) overlay->height_window, 1.0f,
1000.0f);
glEnable (GL_DEPTH_TEST);
gluLookAt (0.0, 0.0, 0.01, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
if (overlay->video_top) {
gst_gl_overlay_load_texture (overlay, overlay->pbuftexture, 0);
if (overlay->pbuftexture == 0)
return;
// if (overlay->stretch) {
// width = (gfloat) overlay->width;
// height = (gfloat) overlay->height;
// }
glLoadIdentity ();
gst_gl_overlay_load_texture (overlay, texture, 1);
} else {
gst_gl_overlay_load_texture (overlay, texture, 1);
if (overlay->pbuftexture == 0)
return;
// if (overlay->stretch) {
// width = (gfloat) overlay->width;
// height = (gfloat) overlay->height;
// }
glLoadIdentity ();
gst_gl_overlay_load_texture (overlay, overlay->pbuftexture, 0);
}
}
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);
if (overlay->type_file == 1) {
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 if (overlay->type_file == 2) {
glBindTexture (GL_TEXTURE_2D, overlay->pbuftexture);
glTexImage2D (GL_TEXTURE_2D, 0, overlay->internalFormat,
overlay->width, overlay->height, 0, overlay->format,
GL_UNSIGNED_BYTE, overlay->pixbuf);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
} else
display->isAlive = FALSE;
}
static gboolean
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gst_gl_overlay_filter_texture (GstGLFilter * filter, guint in_tex,
guint out_tex)
{
GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
if (overlay->pbuf_has_changed && (overlay->location != NULL)) {
if ((overlay->type_file = gst_gl_overlay_load_png (filter)) == 0)
if ((overlay->type_file = gst_gl_overlay_load_jpeg (filter)) == 0)
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, TRUE, in_tex, out_tex,
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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 gint
gst_gl_overlay_load_jpeg (GstGLFilter * filter)
{
GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
FILE *fp = NULL;
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
JSAMPROW j;
int i;
fp = fopen (overlay->location, "rb");
if (!fp) {
g_error ("error: couldn't open file!\n");
return 0;
}
jpeg_create_decompress (&cinfo);
cinfo.err = jpeg_std_error (&jerr);
jpeg_stdio_src (&cinfo, fp);
jpeg_read_header (&cinfo, TRUE);
jpeg_start_decompress (&cinfo);
overlay->width = cinfo.image_width;
overlay->height = cinfo.image_height;
overlay->internalFormat = cinfo.num_components;
if (cinfo.num_components == 1)
overlay->format = GL_LUMINANCE;
else
overlay->format = GL_RGB;
overlay->pixbuf = (GLubyte *) malloc (sizeof (GLubyte) * overlay->width
* overlay->height * overlay->internalFormat);
for (i = 0; i < overlay->height; ++i) {
j = (overlay->pixbuf +
(((int) overlay->height - (i +
1)) * (int) overlay->width * overlay->internalFormat));
jpeg_read_scanlines (&cinfo, &j, 1);
}
jpeg_finish_decompress (&cinfo);
jpeg_destroy_decompress (&cinfo);
fclose (fp);
return 2;
}
static gint
gst_gl_overlay_load_png (GstGLFilter * filter)
{
GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
png_structp png_ptr;
png_infop info_ptr;
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;
png_byte magic[8];
gint n_read;
if (!filter->display)
return 1;
if ((fp = fopen (overlay->location, "rb")) == NULL)
LOAD_ERROR ("file not found");
/* Read magic number */
n_read = fread (magic, 1, sizeof (magic), fp);
if (n_read != sizeof (magic)) {
fclose (fp);
LOAD_ERROR ("can't read PNG magic number");
}
/* Check for valid magic number */
if (png_sig_cmp (magic, 0, sizeof (magic))) {
fclose (fp);
LOAD_ERROR ("not a valid PNG image");
}
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, sizeof (magic));
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 1;
}