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/* GdkPixbuf library - transformations
*
* Copyright (C) 2003 The Free Software Foundation
*
* Authors: Mark Crichton <crichton@gimp.org>
* Miguel de Icaza <miguel@gnu.org>
* Federico Mena-Quintero <federico@gimp.org>
* Havoc Pennington <hp@redhat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GDK_PIXBUF_TRANSFORM_H
#define GDK_PIXBUF_TRANSFORM_H
#if defined(GDK_PIXBUF_DISABLE_SINGLE_INCLUDES) && !defined (GDK_PIXBUF_H_INSIDE) && !defined (GDK_PIXBUF_COMPILATION)
#error "Only <gdk-pixbuf/gdk-pixbuf.h> can be included directly."
#endif
#include <glib.h>
#include <gdk-pixbuf/gdk-pixbuf-core.h>
G_BEGIN_DECLS
/* Scaling */
/**
* GdkInterpType:
* @GDK_INTERP_NEAREST: Nearest neighbor sampling; this is the fastest
* and lowest quality mode. Quality is normally unacceptable when scaling
* down, but may be OK when scaling up.
* @GDK_INTERP_TILES: This is an accurate simulation of the PostScript
* image operator without any interpolation enabled. Each pixel is
* rendered as a tiny parallelogram of solid color, the edges of which
* are implemented with antialiasing. It resembles nearest neighbor for
* enlargement, and bilinear for reduction.
* @GDK_INTERP_BILINEAR: Best quality/speed balance; use this mode by
* default. Bilinear interpolation. For enlargement, it is
* equivalent to point-sampling the ideal bilinear-interpolated image.
* For reduction, it is equivalent to laying down small tiles and
* integrating over the coverage area.
* @GDK_INTERP_HYPER: This is the slowest and highest quality
* reconstruction function. It is derived from the hyperbolic filters in
* Wolberg's "Digital Image Warping", and is formally defined as the
* hyperbolic-filter sampling the ideal hyperbolic-filter interpolated
* image (the filter is designed to be idempotent for 1:1 pixel mapping).
*
* This enumeration describes the different interpolation modes that
* can be used with the scaling functions. @GDK_INTERP_NEAREST is
* the fastest scaling method, but has horrible quality when
* scaling down. @GDK_INTERP_BILINEAR is the best choice if you
* aren't sure what to choose, it has a good speed/quality balance.
*
* <note>
* Cubic filtering is missing from the list; hyperbolic
* interpolation is just as fast and results in higher quality.
* </note>
*/
typedef enum {
GDK_INTERP_NEAREST,
GDK_INTERP_TILES,
GDK_INTERP_BILINEAR,
GDK_INTERP_HYPER
} GdkInterpType;
/**
* GdkPixbufRotation:
* @GDK_PIXBUF_ROTATE_NONE: No rotation.
* @GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE: Rotate by 90 degrees.
* @GDK_PIXBUF_ROTATE_UPSIDEDOWN: Rotate by 180 degrees.
* @GDK_PIXBUF_ROTATE_CLOCKWISE: Rotate by 270 degrees.
*
* The possible rotations which can be passed to gdk_pixbuf_rotate_simple().
* To make them easier to use, their numerical values are the actual degrees.
*/
typedef enum {
GDK_PIXBUF_ROTATE_NONE = 0,
GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE = 90,
GDK_PIXBUF_ROTATE_UPSIDEDOWN = 180,
GDK_PIXBUF_ROTATE_CLOCKWISE = 270
} GdkPixbufRotation;
GDK_PIXBUF_AVAILABLE_IN_ALL
void gdk_pixbuf_scale (const GdkPixbuf *src,
GdkPixbuf *dest,
int dest_x,
int dest_y,
int dest_width,
int dest_height,
double offset_x,
double offset_y,
double scale_x,
double scale_y,
GdkInterpType interp_type);
GDK_PIXBUF_AVAILABLE_IN_ALL
void gdk_pixbuf_composite (const GdkPixbuf *src,
GdkPixbuf *dest,
int dest_x,
int dest_y,
int dest_width,
int dest_height,
double offset_x,
double offset_y,
double scale_x,
double scale_y,
GdkInterpType interp_type,
int overall_alpha);
GDK_PIXBUF_AVAILABLE_IN_ALL
void gdk_pixbuf_composite_color (const GdkPixbuf *src,
GdkPixbuf *dest,
int dest_x,
int dest_y,
int dest_width,
int dest_height,
double offset_x,
double offset_y,
double scale_x,
double scale_y,
GdkInterpType interp_type,
int overall_alpha,
int check_x,
int check_y,
int check_size,
guint32 color1,
guint32 color2);
GDK_PIXBUF_AVAILABLE_IN_ALL
GdkPixbuf *gdk_pixbuf_scale_simple (const GdkPixbuf *src,
int dest_width,
int dest_height,
GdkInterpType interp_type);
GDK_PIXBUF_AVAILABLE_IN_ALL
GdkPixbuf *gdk_pixbuf_composite_color_simple (const GdkPixbuf *src,
int dest_width,
int dest_height,
GdkInterpType interp_type,
int overall_alpha,
int check_size,
guint32 color1,
guint32 color2);
GDK_PIXBUF_AVAILABLE_IN_2_6
GdkPixbuf *gdk_pixbuf_rotate_simple (const GdkPixbuf *src,
GdkPixbufRotation angle);
GDK_PIXBUF_AVAILABLE_IN_2_6
GdkPixbuf *gdk_pixbuf_flip (const GdkPixbuf *src,
gboolean horizontal);
G_END_DECLS
#endif /* GDK_PIXBUF_TRANSFORM_H */
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