GtkPreview

typedef struct _GtkPreview GtkPreview;

The GtkPreview-struct struct contains private data only, and should be accessed using the functions below.

GtkPreviewInfo

typedef struct {
  guchar *lookup;

  gdouble gamma;
} GtkPreviewInfo;

Contains information about global properties of preview widgets. The GtkPreviewInfo struct contains the following fields. (These fields should be considered read-only. They should never be set by an application.)

union GtkDitherInfo

union GtkDitherInfo
{
  gushort s[2];
  guchar c[4];
};

This union not used in GTK+.

gtk_preview_uninit ()

void        gtk_preview_uninit              (void);

This function is deprecated and does nothing.

gtk_preview_new ()

GtkWidget*  gtk_preview_new                 (GtkPreviewType type);

Create a new preview widget.

gtk_preview_size ()

void        gtk_preview_size                (GtkPreview *preview,
                                             gint width,
                                             gint height);

Set the size that the preview widget will request in response to a "size_request" signal. The drawing area may actually be allocated a size larger than this depending on how it is packed within the enclosing containers. The effect of this is determined by whether the preview is set to expand or not (see gtk_preview_expand())

gtk_preview_put ()

void        gtk_preview_put                 (GtkPreview *preview,
                                             GdkWindow *window,
                                             GdkGC *gc,
                                             gint srcx,
                                             gint srcy,
                                             gint destx,
                                             gint desty,
                                             gint width,
                                             gint height);

Takes a portion of the contents of a preview widget and draws it onto the given drawable, window.

gtk_preview_draw_row ()

void        gtk_preview_draw_row            (GtkPreview *preview,
                                             guchar *data,
                                             gint x,
                                             gint y,
                                             gint w);

Sets the data for a portion of a row.

gtk_preview_set_expand ()

void        gtk_preview_set_expand          (GtkPreview *preview,
                                             gboolean expand);

Determines the way that the the preview widget behaves when the size it is allocated is larger than the requested size. If expand is FALSE, then the preview's window and buffer will be no larger than the size set with gtk_preview_size(), and the data set will be centered in the allocation if it is larger. If expand is TRUE then the window and buffer will expand with the allocation; the application is responsible for catching the "size_allocate" signal and providing the data appropriate for this size.

gtk_preview_set_gamma ()

void        gtk_preview_set_gamma           (double gamma_);

Set the gamma-correction value for all preview widgets. (This function will eventually be replaced with a function that sets a per-preview-widget gamma value). The resulting intensity is given by: destination_value * pow (source_value/255, 1/gamma). The gamma value is applied when the data is set with gtk_preview_draw_row() so changing this value will not affect existing data in preview widgets.

gtk_preview_set_color_cube ()

void        gtk_preview_set_color_cube      (guint nred_shades,
                                             guint ngreen_shades,
                                             guint nblue_shades,
                                             guint ngray_shades);

This function is deprecated and does nothing. GdkRGB automatically picks an optimium color cube for the display.

gtk_preview_set_install_cmap ()

void        gtk_preview_set_install_cmap    (gint install_cmap);

This function is deprecated and does nothing. GdkRGB will automatically pick a private colormap if it cannot allocate sufficient colors.

gtk_preview_set_reserved ()

void        gtk_preview_set_reserved        (gint nreserved);

This function is deprecated and does nothing.

gtk_preview_set_dither ()

void        gtk_preview_set_dither          (GtkPreview *preview,
                                             GdkRgbDither dither);

Set the dithering mode for the display.

gtk_preview_get_visual ()

GdkVisual*  gtk_preview_get_visual          (void);

Returns the visual used by preview widgets. This function is deprecated, and you should use gdk_rgb_get_visual() instead.

gtk_preview_get_cmap ()

GdkColormap* gtk_preview_get_cmap           (void);

Returns the colormap used by preview widgets. This function is deprecated, and you should use gdk_rgb_get_cmap() instead.

gtk_preview_get_info ()

GtkPreviewInfo* gtk_preview_get_info        (void);

Return a GtkPreviewInfo structure containing global information about preview widgets.

gtk_preview_reset ()

void        gtk_preview_reset               (void);

This function is deprecated and does nothing. It was once used for changing the colormap and visual on the fly.

The "expand" property

  "expand"               gboolean              : Read / Write

Whether the preview widget should take up the entire space it is allocated.

Default value: FALSE