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ptk-file-icon-renderer.c

/*
*  C Implementation: ptkfileiconrenderer
*
* Description: PtkFileIconRenderer is used to render file icons
*
*
* Author: Hong Jen Yee (PCMan) <pcman.tw (AT) gmail.com>, (C) 2006
*
* Copyright: See COPYING file that comes with this distribution
*
* Part of this class is taken from GtkCellRendererPixbuf written by
* Red Hat, Inc.,  Jonathan Blandford <jrb@redhat.com>
*
*/


#include "ptk-file-icon-renderer.h"

static void
ptk_file_icon_renderer_init ( PtkFileIconRenderer *renderer );

static void
ptk_file_icon_renderer_class_init ( PtkFileIconRendererClass *klass );

static void
ptk_file_icon_renderer_get_property ( GObject *object,
                                      guint param_id,
                                      GValue *value,
                                      GParamSpec *pspec );

static void
ptk_file_icon_renderer_set_property ( GObject *object,
                                      guint param_id,
                                      const GValue *value,
                                      GParamSpec *pspec );

static void
ptk_file_icon_renderer_finalize ( GObject *gobject );


static void
ptk_file_icon_renderer_get_size ( GtkCellRenderer *cell,
                                  GtkWidget *widget,
                                  GdkRectangle *cell_area,
                                  gint *x_offset,
                                  gint *y_offset,
                                  gint *width,
                                  gint *height );


static void
ptk_file_icon_renderer_render ( GtkCellRenderer *cell,
                                GdkWindow *window,
                                GtkWidget *widget,
                                GdkRectangle *background_area,
                                GdkRectangle *cell_area,
                                GdkRectangle *expose_area,
                                guint flags );

enum
{
    PROP_INFO = 1,
    PROP_FLAGS,
    PROP_FOLLOW_STATE
};

static gpointer parent_class;

static GdkPixbuf* link_icon = NULL;

/* GdkPixbuf RGBA C-Source image dump */
#ifdef __SUNPRO_C
#pragma align 4 (link_icon_data)
#endif
#ifdef __GNUC__
static const guint8 link_icon_data[] __attribute__ ((__aligned__ (4))) =
#else
static const guint8 link_icon_data[] =
#endif
    { ""
      /* Pixbuf magic (0x47646b50) */
      "GdkP"
      /* length: header (24) + pixel_data (400) */
      "\0\0\1\250"
      /* pixdata_type (0x1010002) */
      "\1\1\0\2"
      /* rowstride (40) */
      "\0\0\0("
      /* width (10) */
      "\0\0\0\12"
      /* height (10) */
      "\0\0\0\12"
      /* pixel_data: */
      "\200\200\200\377\200\200\200\377\200\200\200\377\200\200\200\377\200"
      "\200\200\377\200\200\200\377\200\200\200\377\200\200\200\377\200\200"
      "\200\377\0\0\0\377\200\200\200\377\377\377\377\377\377\377\377\377\377"
      "\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377"
      "\377\377\377\377\377\377\0\0\0\377\200\200\200\377\377\377\377\377\0"
      "\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\377\377\377\377\377"
      "\377\377\377\0\0\0\377\200\200\200\377\377\377\377\377\0\0\0\377\0\0"
      "\0\377\0\0\0\377\0\0\0\377\377\377\377\377\377\377\377\377\377\377\377"
      "\377\0\0\0\377\200\200\200\377\377\377\377\377\0\0\0\377\0\0\0\377\0"
      "\0\0\377\0\0\0\377\0\0\0\377\377\377\377\377\377\377\377\377\0\0\0\377"
      "\200\200\200\377\377\377\377\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0"
      "\377\0\0\0\377\0\0\0\377\377\377\377\377\0\0\0\377\200\200\200\377\377"
      "\377\377\377\0\0\0\377\377\377\377\377\377\377\377\377\0\0\0\377\0\0"
      "\0\377\0\0\0\377\377\377\377\377\0\0\0\377\200\200\200\377\377\377\377"
      "\377\377\377\377\377\377\377\377\377\377\377\377\377\0\0\0\377\0\0\0"
      "\377\0\0\0\377\377\377\377\377\0\0\0\377\200\200\200\377\377\377\377"
      "\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377"
      "\377\377\377\377\377\377\377\377\377\377\377\377\0\0\0\377\0\0\0\377"
      "\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377"
      "\0\0\0\377\0\0\0\377"
    };


/***************************************************************************
 *
 *  ptk_file_icon_renderer_get_type: here we register our type with
 *                                          the GObject type system if we
 *                                          haven't done so yet. Everything
 *                                          else is done in the callbacks.
 *
 ***************************************************************************/

GType
ptk_file_icon_renderer_get_type ( void )
{
    static GType renderer_type = 0;
    if ( G_UNLIKELY( !renderer_type ) )
    {
        static const GTypeInfo renderer_info =
            {
                sizeof ( PtkFileIconRendererClass ),
                NULL,                                                        /* base_init */
                NULL,                                                        /* base_finalize */
                ( GClassInitFunc ) ptk_file_icon_renderer_class_init,
                NULL,                                                        /* class_finalize */
                NULL,                                                        /* class_data */
                sizeof ( PtkFileIconRenderer ),
                0,                                                           /* n_preallocs */
                ( GInstanceInitFunc ) ptk_file_icon_renderer_init,
            };

        /* Derive from GtkCellRendererPixbuf */
        renderer_type = g_type_register_static ( GTK_TYPE_CELL_RENDERER_PIXBUF,
                                                 "PtkFileIconRenderer",
                                                 &renderer_info,
                                                 0 );
    }

    return renderer_type;
}


/***************************************************************************
 *
 *  ptk_file_icon_renderer_init: set some default properties of the
 *                                      parent (GtkCellRendererPixbuf).
 *
 ***************************************************************************/

static void
ptk_file_icon_renderer_init ( PtkFileIconRenderer *renderer )
{
    if ( !link_icon )
    {
        link_icon = gdk_pixbuf_new_from_inline(
                sizeof(link_icon_data),
                link_icon_data,
                FALSE, NULL );
        g_object_add_weak_pointer( G_OBJECT(link_icon), (gpointer)&link_icon  );
    }
    else
        gdk_pixbuf_ref( (link_icon) );
}


/***************************************************************************
 *
 *  ptk_file_icon_renderer_class_init:
 *
 ***************************************************************************/

static void
ptk_file_icon_renderer_class_init ( PtkFileIconRendererClass *klass )
{
    GtkCellRendererClass * parent_renderer_class = GTK_CELL_RENDERER_CLASS( klass );
    GObjectClass *object_class = G_OBJECT_CLASS( klass );

    parent_class = g_type_class_peek_parent ( klass );
    object_class->finalize = ptk_file_icon_renderer_finalize;

    /* Hook up functions to set and get our
    *   custom cell renderer properties */
    object_class->get_property = ptk_file_icon_renderer_get_property;
    object_class->set_property = ptk_file_icon_renderer_set_property;

    parent_renderer_class->get_size = ptk_file_icon_renderer_get_size;
    parent_renderer_class->render = ptk_file_icon_renderer_render;

    g_object_class_install_property ( object_class,
                                      PROP_INFO,
                                      g_param_spec_pointer ( "info",
                                                             "File info",
                                                             "File info",
                                                             G_PARAM_READWRITE ) );
    g_object_class_install_property ( object_class,
                                      PROP_FOLLOW_STATE,
                                      g_param_spec_boolean ( "follow-state",
                                                             "Follow State",
                                                             "Whether the rendered pixbuf should be "
                                                             "colorized according to the state",
                                                             FALSE,
                                                             G_PARAM_READWRITE ) );
}


/***************************************************************************
 *
 *  ptk_file_icon_renderer_finalize: free any resources here
 *
 ***************************************************************************/

static void
ptk_file_icon_renderer_finalize ( GObject *object )
{
    PtkFileIconRenderer* renderer = PTK_FILE_ICON_RENDERER(object); 
    if( renderer->info )
        vfs_file_info_unref( renderer->info );

    gdk_pixbuf_unref( (link_icon) );
    ( * G_OBJECT_CLASS ( parent_class ) ->finalize ) ( object );
}

/***************************************************************************
 *
 *  ptk_file_icon_renderer_get_property: as it says
 *
 ***************************************************************************/

static void
ptk_file_icon_renderer_get_property ( GObject *object,
                                      guint param_id,
                                      GValue *value,
                                      GParamSpec *psec )
{
    PtkFileIconRenderer * renderer = PTK_FILE_ICON_RENDERER( object );

    switch ( param_id )
    {
        /*    case PROP_FLAGS:
              g_value_set_long(value, renderer->flags);
              break;
        */
    case PROP_INFO:
        if( renderer->info )
            vfs_file_info_ref( renderer->info );
        g_value_set_pointer( value, renderer->info );

    case PROP_FOLLOW_STATE:
        g_value_set_boolean ( value, renderer->follow_state );

    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID ( object, param_id, psec );
        break;
    }
}


/***************************************************************************
 *
 *  ptk_file_icon_renderer_set_property: as it says
 *
 ***************************************************************************/

static void
ptk_file_icon_renderer_set_property ( GObject *object,
                                      guint param_id,
                                      const GValue *value,
                                      GParamSpec *pspec )
{
    PtkFileIconRenderer * renderer = PTK_FILE_ICON_RENDERER ( object );

    switch ( param_id )
    {
    case PROP_INFO:
        if( renderer->info )
            vfs_file_info_unref( renderer->info );
        renderer->info = g_value_get_pointer( value );
        break;

        /*
            case PROP_FLAGS:
              renderer->flags = g_value_get_long(value);
              break;
        */

    case PROP_FOLLOW_STATE:
        renderer->follow_state = g_value_get_boolean ( value );
        break;

    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID( object, param_id, pspec );
        break;
    }
}

/***************************************************************************
 *
 *  ptk_file_icon_renderer_new: return a new cell renderer instance
 *
 ***************************************************************************/

GtkCellRenderer *
ptk_file_icon_renderer_new ( void )
{
    return ( GtkCellRenderer* ) g_object_new( PTK_TYPE_FILE_ICON_RENDERER, NULL );
}


static GdkPixbuf *
create_colorized_pixbuf ( GdkPixbuf *src,
                          GdkColor *new_color )
{
    gint i, j;
    gint width, height, has_alpha, src_row_stride, dst_row_stride;
    gint red_value, green_value, blue_value;
    guchar *target_pixels;
    guchar *original_pixels;
    guchar *pixsrc;
    guchar *pixdest;
    GdkPixbuf *dest;

    red_value = new_color->red / 255.0;
    green_value = new_color->green / 255.0;
    blue_value = new_color->blue / 255.0;

    dest = gdk_pixbuf_new ( gdk_pixbuf_get_colorspace ( src ),
                            gdk_pixbuf_get_has_alpha ( src ),
                            gdk_pixbuf_get_bits_per_sample ( src ),
                            gdk_pixbuf_get_width ( src ),
                            gdk_pixbuf_get_height ( src ) );

    has_alpha = gdk_pixbuf_get_has_alpha ( src );
    width = gdk_pixbuf_get_width ( src );
    height = gdk_pixbuf_get_height ( src );
    src_row_stride = gdk_pixbuf_get_rowstride ( src );
    dst_row_stride = gdk_pixbuf_get_rowstride ( dest );
    target_pixels = gdk_pixbuf_get_pixels ( dest );
    original_pixels = gdk_pixbuf_get_pixels ( src );

    for ( i = 0; i < height; i++ )
    {
        pixdest = target_pixels + i * dst_row_stride;
        pixsrc = original_pixels + i * src_row_stride;
        for ( j = 0; j < width; j++ )
        {
            *pixdest++ = ( *pixsrc++ * red_value ) >> 8;
            *pixdest++ = ( *pixsrc++ * green_value ) >> 8;
            *pixdest++ = ( *pixsrc++ * blue_value ) >> 8;
            if ( has_alpha )
            {
                *pixdest++ = *pixsrc++;
            }
        }
    }
    return dest;
}


/***************************************************************************
    *
    *  ptk_file_icon_renderer_render: crucial - do the rendering.
    *
 ***************************************************************************/

static void
ptk_file_icon_renderer_render ( GtkCellRenderer *cell,
                                GdkWindow *window,
                                GtkWidget *widget,
                                GdkRectangle *background_area,
                                GdkRectangle *cell_area,
                                GdkRectangle *expose_area,
                                guint flags )
{
    GtkCellRendererPixbuf * cellpixbuf = ( GtkCellRendererPixbuf * ) cell;

    GdkPixbuf *pixbuf;
    GdkPixbuf *invisible = NULL;
    GdkPixbuf *colorized = NULL;
    GdkRectangle pix_rect;
    GdkRectangle draw_rect;
    VFSFileInfo* file;

#if GTK_CHECK_VERSION( 2, 8, 0 )

    cairo_t *cr;
#endif

    GtkCellRendererClass* parent_renderer_class;

    parent_renderer_class = GTK_CELL_RENDERER_CLASS( parent_class );

    parent_renderer_class->get_size ( cell, widget, cell_area,
                                      &pix_rect.x,
                                      &pix_rect.y,
                                      &pix_rect.width,
                                      &pix_rect.height );

    pix_rect.x += cell_area->x;
    pix_rect.y += cell_area->y;
    pix_rect.width -= cell->xpad * 2;
    pix_rect.height -= cell->ypad * 2;

    if ( !gdk_rectangle_intersect ( cell_area, &pix_rect, &draw_rect ) ||
            !gdk_rectangle_intersect ( expose_area, &draw_rect, &draw_rect ) )
        return ;

    pixbuf = cellpixbuf->pixbuf;

    if ( cell->is_expander )
    {
        if ( cell->is_expanded &&
                cellpixbuf->pixbuf_expander_open != NULL )
            pixbuf = cellpixbuf->pixbuf_expander_open;
        else if ( !cell->is_expanded &&
                  cellpixbuf->pixbuf_expander_closed != NULL )
            pixbuf = cellpixbuf->pixbuf_expander_closed;
    }

    if ( !pixbuf )
        return ;

    if ( PTK_FILE_ICON_RENDERER( cell ) ->follow_state )
    {
        if ( GTK_WIDGET_STATE ( widget ) == GTK_STATE_INSENSITIVE || !cell->sensitive )
        {
            GtkIconSource * source;

            source = gtk_icon_source_new ();
            gtk_icon_source_set_pixbuf ( source, pixbuf );
            /* The size here is arbitrary; since size isn't
            * wildcarded in the source, it isn't supposed to be
            * scaled by the engine function
            */
            gtk_icon_source_set_size ( source, GTK_ICON_SIZE_SMALL_TOOLBAR );
            gtk_icon_source_set_size_wildcarded ( source, FALSE );

            invisible = gtk_style_render_icon ( widget->style,
                                                source,
                                                gtk_widget_get_direction ( widget ),
                                                GTK_STATE_INSENSITIVE,
                                                /* arbitrary */
                                                ( GtkIconSize ) - 1,
                                                widget,
                                                "gtkcellrendererpixbuf" );

            gtk_icon_source_free ( source );
            pixbuf = invisible;
        }
        else if ( ( flags & ( GTK_CELL_RENDERER_SELECTED /*|GTK_CELL_RENDERER_PRELIT*/ ) ) != 0 )
        {
            GtkStateType state;
            GdkColor* color;

            if ( ( flags & GTK_CELL_RENDERER_SELECTED ) != 0 )
            {
                if ( GTK_WIDGET_HAS_FOCUS ( widget ) )
                    state = GTK_STATE_SELECTED;
                else
                    state = GTK_STATE_ACTIVE;
                color = &widget->style->base[ state ];
            }
            else
            {
                state = GTK_STATE_PRELIGHT;
            }

            colorized = create_colorized_pixbuf ( pixbuf,
                                                  color );

            pixbuf = colorized;
        }
    }
#if GTK_CHECK_VERSION(2, 8, 0)
    cr = gdk_cairo_create ( window );
    gdk_cairo_set_source_pixbuf ( cr, pixbuf, pix_rect.x, pix_rect.y );
    gdk_cairo_rectangle ( cr, &draw_rect );
    cairo_fill ( cr );
#else
    gdk_draw_pixbuf ( GDK_DRAWABLE ( window ), NULL, pixbuf, 0, 0,
                      pix_rect.x, pix_rect.y, pix_rect.width, pix_rect.height,
                      GDK_RGB_DITHER_NORMAL, 0, 0 );
#endif

    file = PTK_FILE_ICON_RENDERER( cell )->info;
    if ( file )
    {
        if ( vfs_file_info_is_symlink( file ) )
        {
#if GTK_CHECK_VERSION(2, 8, 0)
            gdk_cairo_set_source_pixbuf ( cr, link_icon,
                                          pix_rect.x - 2,
                                          pix_rect.y - 2 );
            draw_rect.x -= 2;
            draw_rect.y -= 2;
            gdk_cairo_rectangle ( cr, &draw_rect );
            cairo_fill ( cr );
#else

            gdk_draw_pixbuf ( GDK_DRAWABLE ( window ), NULL, link_icon, 0, 0,
                              pix_rect.x - 2, pix_rect.y - 2,
                              -1, -1, GDK_RGB_DITHER_NORMAL,
                              0, 0 );
#endif
        }
    }

#if GTK_CHECK_VERSION(2, 8, 0)
    cairo_destroy ( cr );
#endif

    if ( invisible )
        g_object_unref ( invisible );

    if ( colorized )
        g_object_unref ( colorized );

}

void ptk_file_icon_renderer_get_size ( GtkCellRenderer *cell,
                                       GtkWidget *widget,
                                       GdkRectangle *cell_area,
                                       gint *x_offset,
                                       gint *y_offset,
                                       gint *width,
                                       gint *height )
{
    GTK_CELL_RENDERER_CLASS( parent_class )->get_size( cell, widget, cell_area,
                                                       x_offset, y_offset,
                                                       width, height );

    if ( *width > *height )
        * height = *width;
    else if ( *width < *height )
        * width = *height;
}



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