10d7cf3273
* clutter/cogl/cogl-path.h: * clutter/cogl/common/cogl-primitives.c: * clutter/cogl/common/cogl-primitives.h: * clutter/cogl/gl/cogl-primitives.c: * clutter/cogl/gles/cogl-primitives.c: Changed the semantics of cogl_path_move_to. Previously this always started a new path but now it instead starts a new disjoint sub path. The path isn't cleared until you call either cogl_path_stroke, cogl_path_fill or cogl_path_new. There are also cogl_path_stroke_preserve and cogl_path_fill_preserve functions. * clutter/cogl/gl/cogl-context.c: * clutter/cogl/gl/cogl-context.h: * clutter/cogl/gles/cogl-context.c: * clutter/cogl/gles/cogl-context.h: Convert the path nodes array to a GArray. * clutter/cogl/gl/cogl-texture.c: * clutter/cogl/gles/cogl-texture.c: Call cogl_clip_ensure * clutter/cogl/common/cogl-clip-stack.c: * clutter/cogl/common/cogl-clip-stack.h: Simplified the clip stack code quite a bit to make it more maintainable. Previously whenever you added a new clip it would go through a separate route to immediately intersect with the current clip and when you removed it again it would immediately rebuild the entire clip. Now when you add or remove a clip it doesn't do anything immediately but just sets a dirty flag instead. * clutter/cogl/gl/cogl.c: * clutter/cogl/gles/cogl.c: Taken away the code to intersect stencil clips when there is exactly one stencil bit. It won't work with path clips and I don't know of any platform that doesn't have eight or zero stencil bits. It needs at least three bits to intersect a path with an existing clip. cogl_features_init now just decides you don't have a stencil buffer at all if you have less than three bits. * clutter/cogl/cogl.h.in: New functions and documentation. * tests/interactive/test-clip.c: Replaced with a different test that lets you add and remove clips. The three different mouse buttons add clips in different shapes. This makes it easier to test multiple levels of clipping. * tests/interactive/test-cogl-primitives.c: Use cogl_path_stroke_preserve when using the same path again. * doc/reference/cogl/cogl-sections.txt: Document the new functions.
358 lines
13 KiB
C
358 lines
13 KiB
C
/* cogl-path.h: Path primitives
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* This file is part of Clutter
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*
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* Copyright (C) 2008 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if !defined(__COGL_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
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#error "Only <cogl/cogl.h> can be included directly."
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#endif
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#ifndef __COGL_PATH_H__
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#define __COGL_PATH_H__
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#include <cogl/cogl-types.h>
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G_BEGIN_DECLS
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/**
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* SECTION:cogl-primitives
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* @short_description: Functions that draw various primitive shapes and
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* allow for construction of more complex paths.
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*
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* There are three levels on which drawing with cogl can be used. The
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* highest level functions construct various simple primitive shapes
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* to be either filled or stroked. Using a lower-level set of functions
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* more complex and arbitrary paths can be constructed by concatenating
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* straight line, bezier curve and arc segments. Additionally there
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* are utility functions that draw the most common primitives - rectangles
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* and trapezoids - in a maximaly optimized fashion.
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*
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* When constructing arbitrary paths, the current pen location is
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* initialized using the move_to command. The subsequent path segments
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* implicitly use the last pen location as their first vertex and move
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* the pen location to the last vertex they produce at the end. Also
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* there are special versions of functions that allow specifying the
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* vertices of the path segments relative to the last pen location
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* rather then in the absolute coordinates.
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*/
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/**
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* cogl_rectangle:
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* @x: X coordinate of the top-left corner
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* @y: Y coordinate of the top-left corner
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* @width: Width of the rectangle
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* @height: Height of the rectangle
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*
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* Fills a rectangle at the given coordinates with the current
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* drawing color in a highly optimizied fashion.
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**/
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void cogl_rectangle (gint x,
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gint y,
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guint width,
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guint height);
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/**
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* cogl_rectanglex:
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* @x: X coordinate of the top-left corner
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* @y: Y coordinate of the top-left corner
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* @width: Width of the rectangle
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* @height: Height of the rectangle
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*
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* A fixed-point version of cogl_fast_fill_rectangle.
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**/
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void cogl_rectanglex (CoglFixed x,
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CoglFixed y,
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CoglFixed width,
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CoglFixed height);
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/**
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* cogl_path_fill:
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*
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* Fills the constructed shape using the current drawing color. The
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* current path is then cleared. To use the path again, call
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* cogl_path_fill_preserve() instead.
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**/
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void cogl_path_fill (void);
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/**
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* cogl_path_fill_preserve:
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*
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* Fills the constructed shape using the current drawing color and
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* preserves the path to be used again.
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*
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* Since: 1.0
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**/
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void cogl_path_fill_preserve (void);
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/**
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* cogl_path_stroke:
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*
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* Strokes the constructed shape using the current drawing color and a
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* width of 1 pixel (regardless of the current transformation
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* matrix). To current path is then cleared. To use the path again,
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* call cogl_path_stroke_preserve() instead.
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**/
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void cogl_path_stroke (void);
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/**
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* cogl_path_stroke_preserve:
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*
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* Strokes the constructed shape using the current drawing color and
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* preserves the path to be used again.
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*
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* Since: 1.0
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**/
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void cogl_path_stroke_preserve (void);
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/**
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* cogl_path_new:
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*
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* Clears the current path and starts a new one.
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*
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* Since: 1.0
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*/
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void cogl_path_new (void);
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/**
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* cogl_path_move_to:
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* @x: X coordinate of the pen location to move to.
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* @y: Y coordinate of the pen location to move to.
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*
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* Moves the pen to the given location. If there is an existing path
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* this will start a new disjoint subpath.
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**/
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void cogl_path_move_to (CoglFixed x,
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CoglFixed y);
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/**
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* cogl_path_rel_move_to:
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* @x: X offset from the current pen location to move the pen to.
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* @y: Y offset from the current pen location to move the pen to.
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*
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* Moves the pen to the given offset relative to the current pen
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* location. If there is an existing path this will start a new
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* disjoint subpath.
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**/
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void cogl_path_rel_move_to (CoglFixed x,
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CoglFixed y);
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/**
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* cogl_path_line_to:
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* @x: X coordinate of the end line vertex
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* @y: Y coordinate of the end line vertex
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*
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* Adds a straight line segment to the current path that ends at the
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* given coordinates.
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**/
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void cogl_path_line_to (CoglFixed x,
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CoglFixed y);
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/**
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* cogl_path_rel_line_to:
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* @x: X offset from the current pen location of the end line vertex
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* @y: Y offset from the current pen location of the end line vertex
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*
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* Adds a straight line segment to the current path that ends at the
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* given coordinates relative to the current pen location.
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**/
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void cogl_path_rel_line_to (CoglFixed x,
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CoglFixed y);
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/**
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* cogl_path_arc:
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* @center_x: X coordinate of the elliptical arc center
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* @center_y: Y coordinate of the elliptical arc center
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* @radius_x: X radius of the elliptical arc
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* @radius_y: Y radious of the elliptical arc
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* @angle_1: Angle in the unit-circle at which the arc begin
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* @angle_2: Angle in the unit-circle at which the arc ends
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*
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* Adds an elliptical arc segment to the current path. A straight line
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* segment will link the current pen location with the first vertex
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* of the arc. If you perform a move_to to the arcs start just before
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* drawing it you create a free standing arc.
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**/
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void cogl_path_arc (CoglFixed center_x,
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CoglFixed center_y,
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CoglFixed radius_x,
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CoglFixed radius_y,
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CoglAngle angle_1,
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CoglAngle angle_2);
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/**
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* cogl_path_curve_to:
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* @x1: X coordinate of the second bezier control point
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* @y1: Y coordinate of the second bezier control point
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* @x2: X coordinate of the third bezier control point
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* @y2: Y coordinate of the third bezier control point
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* @x3: X coordinate of the fourth bezier control point
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* @y3: Y coordinate of the fourth bezier control point
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*
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* Adds a cubic bezier curve segment to the current path with the given
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* second, third and fourth control points and using current pen location
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* as the first control point.
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**/
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void cogl_path_curve_to (CoglFixed x1,
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CoglFixed y1,
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CoglFixed x2,
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CoglFixed y2,
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CoglFixed x3,
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CoglFixed y3);
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/**
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* cogl_path_rel_curve_to:
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* @x1: X coordinate of the second bezier control point
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* @y1: Y coordinate of the second bezier control point
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* @x2: X coordinate of the third bezier control point
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* @y2: Y coordinate of the third bezier control point
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* @x3: X coordinate of the fourth bezier control point
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* @y3: Y coordinate of the fourth bezier control point
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*
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* Adds a cubic bezier curve segment to the current path with the given
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* second, third and fourth control points and using current pen location
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* as the first control point. The given coordinates are relative to the
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* current pen location.
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*/
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void cogl_path_rel_curve_to (CoglFixed x1,
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CoglFixed y1,
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CoglFixed x2,
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CoglFixed y2,
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CoglFixed x3,
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CoglFixed y3);
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/**
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* cogl_path_close:
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*
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* Closes the path being constructed by adding a straight line segment
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* to it that ends at the first vertex of the path.
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**/
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void cogl_path_close (void);
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/**
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* cogl_path_line:
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* @x1: X coordinate of the start line vertex
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* @y1: Y coordinate of the start line vertex
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* @x2: X coordinate of the end line vertex
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* @y2: Y coordinate of the end line vertex
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*
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* Constructs a straight line shape starting and ending at the given
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* coordinates. If there is an existing path this will start a new
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* disjoint sub-path.
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**/
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void cogl_path_line (CoglFixed x1,
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CoglFixed y1,
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CoglFixed x2,
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CoglFixed y2);
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/**
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* cogl_path_polyline:
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* @coords: A pointer to the first element of an array of fixed-point
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* values that specify the vertex coordinates.
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* @num_points: The total number of vertices.
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*
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* Constructs a series of straight line segments, starting from the
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* first given vertex coordinate. If there is an existing path this
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* will start a new disjoint sub-path. Each subsequent segment starts
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* where the previous one ended and ends at the next given vertex
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* coordinate.
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*
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* The coords array must contain 2 * num_points values. The first value
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* represents the X coordinate of the first vertex, the second value
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* represents the Y coordinate of the first vertex, continuing in the same
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* fashion for the rest of the vertices. (num_points - 1) segments will
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* be constructed.
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**/
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void cogl_path_polyline (CoglFixed *coords,
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gint num_points);
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/**
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* cogl_path_polygon:
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* @coords: A pointer to the first element of an array of fixed-point
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* values that specify the vertex coordinates.
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* @num_points: The total number of vertices.
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*
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* Constructs a polygonal shape of the given number of vertices. If
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* there is an existing path this will start a new disjoint sub-path.
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*
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* The coords array must contain 2 * num_points values. The first value
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* represents the X coordinate of the first vertex, the second value
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* represents the Y coordinate of the first vertex, continuing in the same
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* fashion for the rest of the vertices.
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**/
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void cogl_path_polygon (CoglFixed *coords,
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gint num_points);
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/**
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* cogl_path_rectangle:
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* @x: X coordinate of the top-left corner.
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* @y: Y coordinate of the top-left corner.
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* @width: Rectangle width.
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* @height: Rectangle height.
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*
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* Constructs a rectangular shape at the given coordinates. If there
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* is an existing path this will start a new disjoint sub-path.
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**/
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void cogl_path_rectangle (CoglFixed x,
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CoglFixed y,
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CoglFixed width,
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CoglFixed height);
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/**
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* cogl_path_ellipse:
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* @center_x: X coordinate of the ellipse center
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* @center_y: Y coordinate of the ellipse center
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* @radius_x: X radius of the ellipse
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* @radius_y: Y radius of the ellipse
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*
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* Constructs an ellipse shape. If there is an existing path this will
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* start a new disjoint sub-path.
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**/
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void cogl_path_ellipse (CoglFixed center_x,
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CoglFixed center_y,
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CoglFixed radius_x,
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CoglFixed radius_y);
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/**
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* cogl_path_round_rectangle:
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* @x: X coordinate of the top-left corner
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* @y: Y coordinate of the top-left corner
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* @width: Width of the rectangle
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* @height: Height of the rectangle
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* @radius: Radius of the corner arcs.
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* @arc_step: Angle increment resolution for subdivision of
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* the corner arcs.
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*
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* Constructs a rectangular shape with rounded corners. If there is an
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* existing path this will start a new disjoint sub-path.
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**/
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void cogl_path_round_rectangle (CoglFixed x,
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CoglFixed y,
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CoglFixed width,
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CoglFixed height,
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CoglFixed radius,
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CoglAngle arc_step);
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G_END_DECLS
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#endif /* __COGL_PATH_H__ */
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