067a520f26
This adds three new API calls: CoglHandle cogl_path_get() void cogl_path_set(CoglHandle path) CoglHandle cogl_path_copy(CoglHandle path) All of the fields relating to the path have been moved from the Cogl context to a new CoglPath handle type. The cogl context now just contains a CoglPath handle. All of the existing path commands manipulate the data in the current path handle. cogl_path_new now just creates a new path handle and unrefs the old one. The path handle can be stored for later with cogl_path_get. The path can then be copied with cogl_path_copy. Internally it implements copy-on-write semantics with an extra optimisation that it will only copy the data if the new path is modified, but not if the original path is modified. It can do this because the only way to modify a path is by appending to it so the copied path is able to store its own path length and only render the nodes up to that length. For this to work the copied path also needs to keep its own copies of the path extents because the parent path may change these by adding nodes. The clip stack now uses the cogl_path_copy mechanism to store paths in the stack instead of directly copying the data. This should save some memory and processing time.
393 lines
12 KiB
C
393 lines
12 KiB
C
/*
|
|
* Cogl
|
|
*
|
|
* An object oriented GL/GLES Abstraction/Utility Layer
|
|
*
|
|
* Copyright (C) 2008,2009 Intel Corporation.
|
|
*
|
|
* 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/>.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#if !defined(__COGL_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
|
|
#error "Only <cogl/cogl.h> can be included directly."
|
|
#endif
|
|
|
|
#ifndef __COGL_PATH_H__
|
|
#define __COGL_PATH_H__
|
|
|
|
#include <cogl/cogl-types.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
/**
|
|
* SECTION:cogl-paths
|
|
* @short_description: Functions for constructing and drawing 2D paths.
|
|
*
|
|
* There are two levels on which drawing with cogl-paths can be used.
|
|
* The highest level functions construct various simple primitive
|
|
* shapes to be either filled or stroked. Using a lower-level set of
|
|
* functions more complex and arbitrary paths can be constructed by
|
|
* concatenating straight line, bezier curve and arc segments.
|
|
*
|
|
* When constructing arbitrary paths, the current pen location is
|
|
* initialized using the move_to command. The subsequent path segments
|
|
* implicitly use the last pen location as their first vertex and move
|
|
* the pen location to the last vertex they produce at the end. Also
|
|
* there are special versions of functions that allow specifying the
|
|
* vertices of the path segments relative to the last pen location
|
|
* rather then in the absolute coordinates.
|
|
*/
|
|
|
|
/**
|
|
* cogl_path_fill:
|
|
*
|
|
* Fills the constructed shape using the current drawing color. The
|
|
* current path is then cleared. To use the path again, call
|
|
* cogl_path_fill_preserve() instead.
|
|
**/
|
|
void
|
|
cogl_path_fill (void);
|
|
|
|
/**
|
|
* cogl_path_fill_preserve:
|
|
*
|
|
* Fills the constructed shape using the current drawing color and
|
|
* preserves the path to be used again.
|
|
*
|
|
* Since: 1.0
|
|
**/
|
|
void
|
|
cogl_path_fill_preserve (void);
|
|
|
|
/**
|
|
* cogl_path_stroke:
|
|
*
|
|
* Strokes the constructed shape using the current drawing color and a
|
|
* width of 1 pixel (regardless of the current transformation
|
|
* matrix). To current path is then cleared. To use the path again,
|
|
* call cogl_path_stroke_preserve() instead.
|
|
**/
|
|
void
|
|
cogl_path_stroke (void);
|
|
|
|
/**
|
|
* cogl_path_stroke_preserve:
|
|
*
|
|
* Strokes the constructed shape using the current drawing color and
|
|
* preserves the path to be used again.
|
|
*
|
|
* Since: 1.0
|
|
**/
|
|
void
|
|
cogl_path_stroke_preserve (void);
|
|
|
|
/**
|
|
* cogl_path_new:
|
|
*
|
|
* Clears the current path and starts a new one.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
void
|
|
cogl_path_new (void);
|
|
|
|
/**
|
|
* cogl_path_move_to:
|
|
* @x: X coordinate of the pen location to move to.
|
|
* @y: Y coordinate of the pen location to move to.
|
|
*
|
|
* Moves the pen to the given location. If there is an existing path
|
|
* this will start a new disjoint subpath.
|
|
**/
|
|
void
|
|
cogl_path_move_to (float x,
|
|
float y);
|
|
|
|
|
|
/**
|
|
* cogl_path_rel_move_to:
|
|
* @x: X offset from the current pen location to move the pen to.
|
|
* @y: Y offset from the current pen location to move the pen to.
|
|
*
|
|
* Moves the pen to the given offset relative to the current pen
|
|
* location. If there is an existing path this will start a new
|
|
* disjoint subpath.
|
|
**/
|
|
void
|
|
cogl_path_rel_move_to (float x,
|
|
float y);
|
|
|
|
/**
|
|
* cogl_path_line_to:
|
|
* @x: X coordinate of the end line vertex
|
|
* @y: Y coordinate of the end line vertex
|
|
*
|
|
* Adds a straight line segment to the current path that ends at the
|
|
* given coordinates.
|
|
**/
|
|
void
|
|
cogl_path_line_to (float x,
|
|
float y);
|
|
|
|
/**
|
|
* cogl_path_rel_line_to:
|
|
* @x: X offset from the current pen location of the end line vertex
|
|
* @y: Y offset from the current pen location of the end line vertex
|
|
*
|
|
* Adds a straight line segment to the current path that ends at the
|
|
* given coordinates relative to the current pen location.
|
|
**/
|
|
void
|
|
cogl_path_rel_line_to (float x,
|
|
float y);
|
|
|
|
|
|
/**
|
|
* cogl_path_arc:
|
|
* @center_x: X coordinate of the elliptical arc center
|
|
* @center_y: Y coordinate of the elliptical arc center
|
|
* @radius_x: X radius of the elliptical arc
|
|
* @radius_y: Y radius of the elliptical arc
|
|
* @angle_1: Angle in the unit-circle at which the arc begin
|
|
* @angle_2: Angle in the unit-circle at which the arc ends
|
|
*
|
|
* Adds an elliptical arc segment to the current path. A straight line
|
|
* segment will link the current pen location with the first vertex
|
|
* of the arc. If you perform a move_to to the arcs start just before
|
|
* drawing it you create a free standing arc.
|
|
**/
|
|
void
|
|
cogl_path_arc (float center_x,
|
|
float center_y,
|
|
float radius_x,
|
|
float radius_y,
|
|
float angle_1,
|
|
float angle_2);
|
|
|
|
/**
|
|
* cogl_path_curve_to:
|
|
* @x_1: X coordinate of the second bezier control point
|
|
* @y_1: Y coordinate of the second bezier control point
|
|
* @x_2: X coordinate of the third bezier control point
|
|
* @y_2: Y coordinate of the third bezier control point
|
|
* @x_3: X coordinate of the fourth bezier control point
|
|
* @y_3: Y coordinate of the fourth bezier control point
|
|
*
|
|
* Adds a cubic bezier curve segment to the current path with the given
|
|
* second, third and fourth control points and using current pen location
|
|
* as the first control point.
|
|
**/
|
|
void
|
|
cogl_path_curve_to (float x_1,
|
|
float y_1,
|
|
float x_2,
|
|
float y_2,
|
|
float x_3,
|
|
float y_3);
|
|
|
|
/**
|
|
* cogl_path_rel_curve_to:
|
|
* @x_1: X coordinate of the second bezier control point
|
|
* @y_1: Y coordinate of the second bezier control point
|
|
* @x_2: X coordinate of the third bezier control point
|
|
* @y_2: Y coordinate of the third bezier control point
|
|
* @x_3: X coordinate of the fourth bezier control point
|
|
* @y_3: Y coordinate of the fourth bezier control point
|
|
*
|
|
* Adds a cubic bezier curve segment to the current path with the given
|
|
* second, third and fourth control points and using current pen location
|
|
* as the first control point. The given coordinates are relative to the
|
|
* current pen location.
|
|
*/
|
|
void
|
|
cogl_path_rel_curve_to (float x_1,
|
|
float y_1,
|
|
float x_2,
|
|
float y_2,
|
|
float x_3,
|
|
float y_3);
|
|
|
|
/**
|
|
* cogl_path_close:
|
|
*
|
|
* Closes the path being constructed by adding a straight line segment
|
|
* to it that ends at the first vertex of the path.
|
|
**/
|
|
void
|
|
cogl_path_close (void);
|
|
|
|
/**
|
|
* cogl_path_line:
|
|
* @x_1: X coordinate of the start line vertex
|
|
* @y_1: Y coordinate of the start line vertex
|
|
* @x_2: X coordinate of the end line vertex
|
|
* @y_2: Y coordinate of the end line vertex
|
|
*
|
|
* Constructs a straight line shape starting and ending at the given
|
|
* coordinates. If there is an existing path this will start a new
|
|
* disjoint sub-path.
|
|
**/
|
|
void
|
|
cogl_path_line (float x_1,
|
|
float y_1,
|
|
float x_2,
|
|
float y_2);
|
|
|
|
/**
|
|
* cogl_path_polyline:
|
|
* @coords: (in) (array) (transfer none): A pointer to the first element of an
|
|
* array of fixed-point values that specify the vertex coordinates.
|
|
* @num_points: The total number of vertices.
|
|
*
|
|
* Constructs a series of straight line segments, starting from the
|
|
* first given vertex coordinate. If there is an existing path this
|
|
* will start a new disjoint sub-path. Each subsequent segment starts
|
|
* where the previous one ended and ends at the next given vertex
|
|
* coordinate.
|
|
*
|
|
* The coords array must contain 2 * num_points values. The first value
|
|
* represents the X coordinate of the first vertex, the second value
|
|
* represents the Y coordinate of the first vertex, continuing in the same
|
|
* fashion for the rest of the vertices. (num_points - 1) segments will
|
|
* be constructed.
|
|
**/
|
|
void
|
|
cogl_path_polyline (float *coords,
|
|
int num_points);
|
|
|
|
|
|
/**
|
|
* cogl_path_polygon:
|
|
* @coords: (in) (array) (transfer none): A pointer to the first element of
|
|
* an array of fixed-point values that specify the vertex coordinates.
|
|
* @num_points: The total number of vertices.
|
|
*
|
|
* Constructs a polygonal shape of the given number of vertices. If
|
|
* there is an existing path this will start a new disjoint sub-path.
|
|
*
|
|
* The coords array must contain 2 * num_points values. The first value
|
|
* represents the X coordinate of the first vertex, the second value
|
|
* represents the Y coordinate of the first vertex, continuing in the same
|
|
* fashion for the rest of the vertices.
|
|
**/
|
|
void
|
|
cogl_path_polygon (float *coords,
|
|
int num_points);
|
|
|
|
|
|
/**
|
|
* cogl_path_rectangle:
|
|
* @x_1: X coordinate of the top-left corner.
|
|
* @y_1: Y coordinate of the top-left corner.
|
|
* @x_2: X coordinate of the bottom-right corner.
|
|
* @y_2: Y coordinate of the bottom-right corner.
|
|
*
|
|
* Constructs a rectangular shape at the given coordinates. If there
|
|
* is an existing path this will start a new disjoint sub-path.
|
|
**/
|
|
void
|
|
cogl_path_rectangle (float x_1,
|
|
float y_1,
|
|
float x_2,
|
|
float y_2);
|
|
|
|
/**
|
|
* cogl_path_ellipse:
|
|
* @center_x: X coordinate of the ellipse center
|
|
* @center_y: Y coordinate of the ellipse center
|
|
* @radius_x: X radius of the ellipse
|
|
* @radius_y: Y radius of the ellipse
|
|
*
|
|
* Constructs an ellipse shape. If there is an existing path this will
|
|
* start a new disjoint sub-path.
|
|
**/
|
|
void
|
|
cogl_path_ellipse (float center_x,
|
|
float center_y,
|
|
float radius_x,
|
|
float radius_y);
|
|
|
|
/**
|
|
* cogl_path_round_rectangle:
|
|
* @x_1: X coordinate of the top-left corner.
|
|
* @y_1: Y coordinate of the top-left corner.
|
|
* @x_2: X coordinate of the bottom-right corner.
|
|
* @y_2: Y coordinate of the bottom-right corner.
|
|
* @radius: Radius of the corner arcs.
|
|
* @arc_step: Angle increment resolution for subdivision of
|
|
* the corner arcs.
|
|
*
|
|
* Constructs a rectangular shape with rounded corners. If there is an
|
|
* existing path this will start a new disjoint sub-path.
|
|
**/
|
|
void
|
|
cogl_path_round_rectangle (float x_1,
|
|
float y_1,
|
|
float x_2,
|
|
float y_2,
|
|
float radius,
|
|
float arc_step);
|
|
|
|
/**
|
|
* cogl_path_get:
|
|
*
|
|
* Gets a handle to the current path. The path can later be used again
|
|
* by calling cogl_path_set(). Note that the path isn't copied so if
|
|
* you later call any functions to add to the path it will affect the
|
|
* returned handle too. No reference is taken on the path so if you
|
|
* want to retain it you should take your own reference with
|
|
* cogl_handle_ref().
|
|
*
|
|
* Return value: a handle to the current path.
|
|
*
|
|
* Since: 1.4
|
|
*/
|
|
CoglHandle
|
|
cogl_path_get (void);
|
|
|
|
/**
|
|
* cogl_path_set:
|
|
* @handle: A %CoglHandle to a path
|
|
*
|
|
* Replaces the current path with @handle. A reference is taken on the
|
|
* handle so if you no longer need the path you should unref with
|
|
* cogl_handle_unref().
|
|
*
|
|
* Since: 1.4
|
|
*/
|
|
void
|
|
cogl_path_set (CoglHandle handle);
|
|
|
|
/**
|
|
* cogl_path_copy:
|
|
* @handle: A %CoglHandle to a path
|
|
*
|
|
* Returns a new copy of the path in @handle. The new path has a
|
|
* reference count of 1 so you should unref it with
|
|
* cogl_handle_unref() if you no longer need it.
|
|
*
|
|
* Internally the path will share the data until one of the paths is
|
|
* modified so copying paths should be relatively cheap.
|
|
*
|
|
* Return value: a copy of the path in @handle.
|
|
*/
|
|
CoglHandle
|
|
cogl_path_copy (CoglHandle handle);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __COGL_PATH_H__ */
|