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gstreamer/gst/geometrictransform/gstgeometrictransform.h

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geometrictransform: New plugin for geometric transforms Adds a new plugin that has elements that perform geometric transformations to images. By geometric transformations I mean that the operations are functions that given the output pixel position, get the pixel position in the input image. This pixel is then copied from input to output. The gstgeometrictransform baseclass makes it easy to write such elements. It boils down to write the mapping function and exposing properties Already added the first of the elements, 'pinch'. It's a common effect in image editors, like gimp (distort -> pinch)
2010-05-25 02:57:05 +00:00
/* GStreamer
* Copyright (C) <2010> Thiago Santos <thiago.sousa.santos@collabora.co.uk>
*
* 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
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_GEOMETRIC_TRANSFORM_H__
#define __GST_GEOMETRIC_TRANSFORM_H__
#include <gst/video/gstvideofilter.h>
#include <gst/video/video.h>
G_BEGIN_DECLS
#define GST_TYPE_GEOMETRIC_TRANSFORM \
(gst_geometric_transform_get_type())
#define GST_GEOMETRIC_TRANSFORM(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GEOMETRIC_TRANSFORM,GstGeometricTransform))
#define GST_GEOMETRIC_TRANSFORM_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GEOMETRIC_TRANSFORM,GstGeometricTransformClass))
#define GST_IS_GEOMETRIC_TRANSFORM(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GEOMETRIC_TRANSFORM))
#define GST_IS_GEOMETRIC_TRANSFORM_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GEOMETRIC_TRANSFORM))
#define GST_GEOMETRIC_TRANSFORM_GET_CLASS(obj) \
(G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_GEOMETRIC_TRANSFORM,GstGeometricTransformClass))
geometrictransform: Descriptions and default values Improve some properties and element descriptions and changes some default properties values.
2010-06-05 13:58:00 +00:00
enum
{
GST_GT_OFF_EDGES_PIXELS_IGNORE = 0,
GST_GT_OFF_EDGES_PIXELS_CLAMP,
GST_GT_OFF_EDGES_PIXELS_WRAP
};
geometrictransform: New plugin for geometric transforms Adds a new plugin that has elements that perform geometric transformations to images. By geometric transformations I mean that the operations are functions that given the output pixel position, get the pixel position in the input image. This pixel is then copied from input to output. The gstgeometrictransform baseclass makes it easy to write such elements. It boils down to write the mapping function and exposing properties Already added the first of the elements, 'pinch'. It's a common effect in image editors, like gimp (distort -> pinch)
2010-05-25 02:57:05 +00:00
typedef struct _GstGeometricTransform GstGeometricTransform;
typedef struct _GstGeometricTransformClass GstGeometricTransformClass;
geometrictransform: Rename some variables for clarity Renames some variables and adds a minimum doc to the mapping function for a little clarity. Also uses gstvideo functions for the row and pixel strides instead of hardcoded values
2010-05-26 21:22:02 +00:00
/**
* GstGeometricTransformMapFunc:
*
* Given the output pixel position, this function calculates the input pixel
* position. The element using this function will then copy the input pixel
* data to the output pixel.
*
* @gt: The #GstGeometricTransform
* @x: The output pixel x coordinate
* @y: The output pixel y coordinate
* @_input_x: The input pixel x coordinate
* @_input_y: The input pixel y coordinate
* Returns: True on success, false otherwise
*/
geometrictransform: New plugin for geometric transforms Adds a new plugin that has elements that perform geometric transformations to images. By geometric transformations I mean that the operations are functions that given the output pixel position, get the pixel position in the input image. This pixel is then copied from input to output. The gstgeometrictransform baseclass makes it easy to write such elements. It boils down to write the mapping function and exposing properties Already added the first of the elements, 'pinch'. It's a common effect in image editors, like gimp (distort -> pinch)
2010-05-25 02:57:05 +00:00
typedef gboolean (*GstGeometricTransformMapFunc) (GstGeometricTransform * gt,
geometrictransform: Rename some variables for clarity Renames some variables and adds a minimum doc to the mapping function for a little clarity. Also uses gstvideo functions for the row and pixel strides instead of hardcoded values
2010-05-26 21:22:02 +00:00
gint x, gint y, gdouble * _input_x, gdouble *_input_y);
geometrictransform: New plugin for geometric transforms Adds a new plugin that has elements that perform geometric transformations to images. By geometric transformations I mean that the operations are functions that given the output pixel position, get the pixel position in the input image. This pixel is then copied from input to output. The gstgeometrictransform baseclass makes it easy to write such elements. It boils down to write the mapping function and exposing properties Already added the first of the elements, 'pinch'. It's a common effect in image editors, like gimp (distort -> pinch)
2010-05-25 02:57:05 +00:00
geometrictransform: Adds prepare function and cleanup Adds a prepare function to make subclasses precalculate values that will be used throughout the mapping functions. Also adds a missing cleanup to fix a memleak
2010-05-30 15:36:08 +00:00
/**
* GstGeometricTransformPrepareFunc:
*
* Called right before starting to calculate the mapping so that
* instances might precalculate some values.
*/
typedef gboolean (*GstGeometricTransformPrepareFunc) (
GstGeometricTransform * gt);
geometrictransform: New plugin for geometric transforms Adds a new plugin that has elements that perform geometric transformations to images. By geometric transformations I mean that the operations are functions that given the output pixel position, get the pixel position in the input image. This pixel is then copied from input to output. The gstgeometrictransform baseclass makes it easy to write such elements. It boils down to write the mapping function and exposing properties Already added the first of the elements, 'pinch'. It's a common effect in image editors, like gimp (distort -> pinch)
2010-05-25 02:57:05 +00:00
/**
* GstGeometricTransform:
*
* Opaque datastructure.
*/
struct _GstGeometricTransform {
GstVideoFilter videofilter;
gint width, height;
GstVideoFormat format;
geometrictransform: Rename some variables for clarity Renames some variables and adds a minimum doc to the mapping function for a little clarity. Also uses gstvideo functions for the row and pixel strides instead of hardcoded values
2010-05-26 21:22:02 +00:00
gint pixel_stride;
gint row_stride;
geometrictransform: Precalculate mapping array Precalculate when setting caps the warping map to avoid recalculating it every buffer
2010-05-27 00:39:21 +00:00
geometrictransform: adds some properties to base class Adds a property to select what to do with pixels that are mapped out of edges: ignore, clamp or wrap.
2010-06-03 01:01:31 +00:00
/* properties */
gint off_edge_pixels;
geometrictransform: Precalculate mapping array Precalculate when setting caps the warping map to avoid recalculating it every buffer
2010-05-27 00:39:21 +00:00
gdouble *map;
geometrictransform: New plugin for geometric transforms Adds a new plugin that has elements that perform geometric transformations to images. By geometric transformations I mean that the operations are functions that given the output pixel position, get the pixel position in the input image. This pixel is then copied from input to output. The gstgeometrictransform baseclass makes it easy to write such elements. It boils down to write the mapping function and exposing properties Already added the first of the elements, 'pinch'. It's a common effect in image editors, like gimp (distort -> pinch)
2010-05-25 02:57:05 +00:00
};
struct _GstGeometricTransformClass {
GstVideoFilterClass parent_class;
GstGeometricTransformMapFunc map_func;
geometrictransform: Adds prepare function and cleanup Adds a prepare function to make subclasses precalculate values that will be used throughout the mapping functions. Also adds a missing cleanup to fix a memleak
2010-05-30 15:36:08 +00:00
GstGeometricTransformPrepareFunc prepare_func;
geometrictransform: New plugin for geometric transforms Adds a new plugin that has elements that perform geometric transformations to images. By geometric transformations I mean that the operations are functions that given the output pixel position, get the pixel position in the input image. This pixel is then copied from input to output. The gstgeometrictransform baseclass makes it easy to write such elements. It boils down to write the mapping function and exposing properties Already added the first of the elements, 'pinch'. It's a common effect in image editors, like gimp (distort -> pinch)
2010-05-25 02:57:05 +00:00
};
GType gst_geometric_transform_get_type (void);
G_END_DECLS
#endif /* __GST_GEOMETRIC_TRANSFORM_H__ */
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