eff57a1cb0
svn merge \ https://svn.o-hand.com/repos/clutter/trunk/clutter@2509 \ https://svn.o-hand.com/repos/clutter/branches/clutter-ivan@HEAD
1093 lines
29 KiB
C
1093 lines
29 KiB
C
/*
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* Clutter COGL
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*
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* A basic GL/GLES Abstraction/Utility Layer
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2007 OpenedHand
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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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "cogl.h"
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#include "cogl-internal.h"
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#include "cogl-context.h"
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#include <string.h>
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#include <gmodule.h>
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#define _COGL_MAX_BEZ_RECURSE_DEPTH 16
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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_fast_fill_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
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cogl_fast_fill_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_GET_CONTEXT (ctx, NO_RETVAL);
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cogl_enable (ctx->color_alpha < 255
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? COGL_ENABLE_BLEND : 0);
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GE( glRecti (x, y, x + width, y + height) );
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}
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/**
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* cogl_fast_fill_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
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cogl_fast_fill_rectanglex (ClutterFixed x,
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ClutterFixed y,
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ClutterFixed width,
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ClutterFixed height)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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cogl_enable (ctx->color_alpha < 255
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? COGL_ENABLE_BLEND : 0);
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GE( glRectf (CLUTTER_FIXED_TO_FLOAT (x),
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CLUTTER_FIXED_TO_FLOAT (y),
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CLUTTER_FIXED_TO_FLOAT (x + width),
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CLUTTER_FIXED_TO_FLOAT (y + height)) );
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}
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/**
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* cogl_fast_fill_trapezoid:
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* @y1: Y coordinate of the top two vertices.
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* @x11: X coordinate of the top-left vertex.
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* @x21: X coordinate of the top-right vertex.
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* @y2: Y coordinate of the bottom two vertices.
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* @x12: X coordinate of the bottom-left vertex.
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* @x22: X coordinate of the bottom-right vertex.
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*
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* Fills a trapezoid at the given coordinates with the current
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* drawing color in a highly optimized fashion.
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**/
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void
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cogl_fast_fill_trapezoid (gint y1,
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gint x11,
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gint x21,
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gint y2,
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gint x12,
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gint x22)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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cogl_enable (ctx->color_alpha < 255
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? COGL_ENABLE_BLEND : 0);
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GE( glBegin (GL_QUADS) );
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GE( glVertex2i (x11, y1) );
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GE( glVertex2i (x21, y1) );
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GE( glVertex2i (x22, y2) );
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GE( glVertex2i (x12, y2) );
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GE( glEnd () );
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}
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/**
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* cogl_fast_fill_trapezoidx:
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* @y1: Y coordinate of the top two vertices.
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* @x11: X coordinate of the top-left vertex.
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* @x21: X coordinate of the top-right vertex.
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* @y2: Y coordinate of the bottom two vertices.
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* @x12: X coordinate of the bottom-left vertex.
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* @x22: X coordinate of the bottom-right vertex.
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*
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* A fixed-point version of cogl_fast_fill_trapezoid.
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**/
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void
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cogl_fast_fill_trapezoidx (ClutterFixed y1,
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ClutterFixed x11,
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ClutterFixed x21,
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ClutterFixed y2,
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ClutterFixed x12,
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ClutterFixed x22)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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cogl_enable (ctx->color_alpha < 255
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? COGL_ENABLE_BLEND : 0);
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GE( glBegin (GL_QUADS) );
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GE( glVertex2f (CLUTTER_FIXED_TO_FLOAT (x11),
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CLUTTER_FIXED_TO_FLOAT (y1)) );
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GE( glVertex2f (CLUTTER_FIXED_TO_FLOAT (x21),
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CLUTTER_FIXED_TO_FLOAT (y1)) );
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GE( glVertex2f (CLUTTER_FIXED_TO_FLOAT (x22),
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CLUTTER_FIXED_TO_FLOAT (y2)) );
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GE( glVertex2f (CLUTTER_FIXED_TO_FLOAT (x12),
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CLUTTER_FIXED_TO_FLOAT (y2)) );
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GE( glEnd () );
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}
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static void
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_cogl_path_clear_nodes ()
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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if (ctx->path_nodes)
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g_free(ctx->path_nodes);
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ctx->path_nodes = (CoglFloatVec2*) g_malloc (2 * sizeof(CoglFloatVec2));
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ctx->path_nodes_size = 0;
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ctx->path_nodes_cap = 2;
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}
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static void
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_cogl_path_add_node (ClutterFixed x,
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ClutterFixed y)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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CoglFloatVec2 *new_nodes = NULL;
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if (ctx->path_nodes_size == ctx->path_nodes_cap)
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{
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new_nodes = g_realloc (ctx->path_nodes,
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2 * ctx->path_nodes_cap
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* sizeof (CoglFloatVec2));
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if (new_nodes == NULL) return;
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ctx->path_nodes = new_nodes;
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ctx->path_nodes_cap *= 2;
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}
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ctx->path_nodes [ctx->path_nodes_size] .x = CLUTTER_FIXED_TO_FLOAT (x);
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ctx->path_nodes [ctx->path_nodes_size] .y = CLUTTER_FIXED_TO_FLOAT (y);
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ctx->path_nodes_size++;
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if (ctx->path_nodes_size == 1)
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{
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ctx->path_nodes_min.x = ctx->path_nodes_max.x = x;
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ctx->path_nodes_min.y = ctx->path_nodes_max.y = y;
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}
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else
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{
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if (x < ctx->path_nodes_min.x) ctx->path_nodes_min.x = x;
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if (x > ctx->path_nodes_max.x) ctx->path_nodes_max.x = x;
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if (y < ctx->path_nodes_min.y) ctx->path_nodes_min.y = y;
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if (y > ctx->path_nodes_max.y) ctx->path_nodes_max.y = y;
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}
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}
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static void
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_cogl_path_stroke_nodes ()
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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cogl_enable (COGL_ENABLE_VERTEX_ARRAY
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| (ctx->color_alpha < 255
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? COGL_ENABLE_BLEND : 0));
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GE( glVertexPointer (2, GL_FLOAT, 0, ctx->path_nodes) );
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GE( glDrawArrays (GL_LINE_STRIP, 0, ctx->path_nodes_size) );
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}
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static void
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_cogl_path_fill_nodes ()
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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guint bounds_x;
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guint bounds_y;
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guint bounds_w;
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guint bounds_h;
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GE( glClear (GL_STENCIL_BUFFER_BIT) );
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GE( glEnable (GL_STENCIL_TEST) );
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GE( glStencilFunc (GL_ALWAYS, 0x0, 0x0) );
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GE( glStencilOp (GL_INVERT, GL_INVERT, GL_INVERT) );
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GE( glColorMask (GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE) );
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cogl_enable (COGL_ENABLE_VERTEX_ARRAY
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| (ctx->color_alpha < 255
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? COGL_ENABLE_BLEND : 0));
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GE( glVertexPointer (2, GL_FLOAT, 0, ctx->path_nodes) );
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GE( glDrawArrays (GL_TRIANGLE_FAN, 0, ctx->path_nodes_size) );
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GE( glStencilFunc (GL_EQUAL, 0x1, 0x1) );
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GE( glStencilOp (GL_ZERO, GL_ZERO, GL_ZERO) );
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GE( glColorMask (GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE) );
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bounds_x = CLUTTER_FIXED_FLOOR (ctx->path_nodes_min.x);
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bounds_y = CLUTTER_FIXED_FLOOR (ctx->path_nodes_min.y);
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bounds_w = CLUTTER_FIXED_CEIL (ctx->path_nodes_max.x - ctx->path_nodes_min.x);
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bounds_h = CLUTTER_FIXED_CEIL (ctx->path_nodes_max.y - ctx->path_nodes_min.y);
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cogl_fast_fill_rectangle (bounds_x, bounds_y, bounds_w, bounds_h);
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GE( glDisable (GL_STENCIL_TEST) );
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}
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/**
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* cogl_fill:
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*
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* Fills the constructed shape using the current drawing color.
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**/
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void
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cogl_fill ()
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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if (ctx->path_nodes_size == 0)
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return;
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_cogl_path_fill_nodes();
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}
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/**
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* cogl_stroke:
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*
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* Strokes the constructed shape using the current drawing color
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* and a width of 1 pixel (regardless of the current transformation
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* matrix).
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**/
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void
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cogl_stroke ()
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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if (ctx->path_nodes_size == 0)
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return;
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_cogl_path_stroke_nodes();
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}
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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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* Clears the previously constructed shape and begins a new path
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* contour by moving the pen to the given coordinates.
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**/
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void
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cogl_path_move_to (ClutterFixed x,
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ClutterFixed y)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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/* FIXME: handle multiple contours maybe? */
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_cogl_path_clear_nodes ();
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_cogl_path_add_node (x, y);
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ctx->path_start.x = x;
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ctx->path_start.y = y;
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ctx->path_pen = ctx->path_start;
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}
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/**
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* cogl_path_move_to_rel:
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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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* Clears the previously constructed shape and begins a new path
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* contour by moving the pen to the given coordinates relative
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* to the current pen location.
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**/
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void
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cogl_path_move_to_rel (ClutterFixed x,
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ClutterFixed y)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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cogl_path_move_to (ctx->path_pen.x + x,
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ctx->path_pen.y + y);
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}
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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
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cogl_path_line_to (ClutterFixed x,
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ClutterFixed y)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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_cogl_path_add_node (x, y);
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ctx->path_pen.x = x;
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ctx->path_pen.y = y;
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}
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/**
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* cogl_path_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
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cogl_path_line_to_rel (ClutterFixed x,
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ClutterFixed y)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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cogl_path_line_to (ctx->path_pen.x + x,
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ctx->path_pen.y + y);
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}
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/**
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* cogl_path_h_line_to:
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* @x: X coordinate of the end line vertex
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*
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* Adds a straight horizontal line segment to the current path that
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* ends at the given X coordinate and current pen Y coordinate.
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**/
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void
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cogl_path_h_line_to (ClutterFixed x)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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cogl_path_line_to (x,
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ctx->path_pen.y);
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}
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/**
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* cogl_path_v_line_to:
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* @y: Y coordinate of the end line vertex
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*
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* Adds a stright vertical line segment to the current path that ends
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* at the current pen X coordinate and the given Y coordinate.
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**/
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void
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cogl_path_v_line_to (ClutterFixed y)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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cogl_path_line_to (ctx->path_pen.x,
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y);
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}
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/**
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* cogl_path_h_line_to_rel:
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* @x: X offset from the current pen location of the end line vertex
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*
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* Adds a straight horizontal line segment to the current path that
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* ends at the given X coordinate relative to the current pen location
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* and current pen Y coordinate.
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**/
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void
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cogl_path_h_line_to_rel (ClutterFixed x)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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cogl_path_line_to (ctx->path_pen.x + x,
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ctx->path_pen.y);
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}
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/**
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* cogl_path_v_line_to_rel:
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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 stright vertical line segment to the current path that ends
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* at the current pen X coordinate and the given Y coordinate relative
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* to the current pen location.
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**/
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void
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cogl_path_v_line_to_rel (ClutterFixed y)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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cogl_path_line_to (ctx->path_pen.x,
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ctx->path_pen.y + y);
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}
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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
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cogl_path_close ()
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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_cogl_path_add_node (ctx->path_start.x, ctx->path_start.y);
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ctx->path_pen = ctx->path_start;
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}
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/**
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* cogl_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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* Clears the previously constructed shape and constructs a straight
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* line shape start and ending at the given coordinates.
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**/
|
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void
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cogl_line (ClutterFixed x1,
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ClutterFixed y1,
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ClutterFixed x2,
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ClutterFixed y2)
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{
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cogl_path_move_to (x1, y1);
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cogl_path_line_to (x2, y2);
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}
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/**
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* cogl_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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* Clears the previously constructed shape and constructs a series of straight
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* line segments, starting from the first given vertex coordinate. Each
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* subsequent segment stars where the previous one ended and ends at the next
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* given vertex 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
|
|
* 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_polyline (ClutterFixed *coords,
|
|
gint num_points)
|
|
{
|
|
gint c = 0;
|
|
|
|
cogl_path_move_to (coords[0], coords[1]);
|
|
|
|
for (c = 1; c < num_points; ++c)
|
|
cogl_path_line_to (coords[2*c], coords[2*c+1]);
|
|
}
|
|
|
|
|
|
/**
|
|
* cogl_polygon:
|
|
* @coords: 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.
|
|
*
|
|
* Clears the previously constructed shape and constructs a polygonal
|
|
* shape of the given number of vertices.
|
|
*
|
|
* 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_polygon (ClutterFixed *coords,
|
|
gint num_points)
|
|
{
|
|
cogl_polyline (coords, num_points);
|
|
cogl_path_close ();
|
|
}
|
|
|
|
/**
|
|
* cogl_rectangle:
|
|
* @x: X coordinate of the top-left corner.
|
|
* @y: Y coordinate of the top-left corner.
|
|
* @width: Rectangle width.
|
|
* @height: Rectangle height.
|
|
*
|
|
* Clears the previously constructed shape and constructs a rectangular
|
|
* shape at the given coordinates.
|
|
**/
|
|
void
|
|
cogl_rectangle (ClutterFixed x,
|
|
ClutterFixed y,
|
|
ClutterFixed width,
|
|
ClutterFixed height)
|
|
{
|
|
cogl_path_move_to (x, y);
|
|
cogl_path_line_to (x + width, y);
|
|
cogl_path_line_to (x + width, y + height);
|
|
cogl_path_line_to (x, y + height);
|
|
cogl_path_close ();
|
|
}
|
|
|
|
static void
|
|
_cogl_arc (ClutterFixed center_x,
|
|
ClutterFixed center_y,
|
|
ClutterFixed radius_x,
|
|
ClutterFixed radius_y,
|
|
ClutterAngle angle_1,
|
|
ClutterAngle angle_2,
|
|
ClutterAngle angle_step,
|
|
guint move_first)
|
|
{
|
|
ClutterAngle a = 0x0;
|
|
ClutterAngle temp = 0x0;
|
|
ClutterFixed cosa = 0x0;
|
|
ClutterFixed sina = 0x0;
|
|
ClutterFixed px = 0x0;
|
|
ClutterFixed py = 0x0;
|
|
|
|
/* Fix invalid angles */
|
|
|
|
if (angle_1 == angle_2 || angle_step == 0x0)
|
|
return;
|
|
|
|
if (angle_step < 0x0)
|
|
angle_step = -angle_step;
|
|
|
|
if (angle_2 < angle_1)
|
|
{
|
|
temp = angle_1;
|
|
angle_1 = angle_2;
|
|
angle_2 = temp;
|
|
}
|
|
|
|
/* Walk the arc by given step */
|
|
|
|
for (a = angle_1; a < angle_2; a += angle_step)
|
|
{
|
|
cosa = clutter_cosi (a);
|
|
sina = clutter_sini (a);
|
|
|
|
px = center_x + CFX_MUL (cosa, radius_x);
|
|
py = center_y + CFX_MUL (sina, radius_y);
|
|
|
|
if (a == angle_1 && move_first)
|
|
cogl_path_move_to (px, py);
|
|
else
|
|
cogl_path_line_to (px, py);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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 radious 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
|
|
* @angle_step: Angle increment resolution for subdivision
|
|
*
|
|
* 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.
|
|
**/
|
|
void
|
|
cogl_path_arc (ClutterFixed center_x,
|
|
ClutterFixed center_y,
|
|
ClutterFixed radius_x,
|
|
ClutterFixed radius_y,
|
|
ClutterAngle angle_1,
|
|
ClutterAngle angle_2,
|
|
ClutterAngle angle_step)
|
|
{
|
|
_cogl_arc (center_x, center_y,
|
|
radius_x, radius_y,
|
|
angle_1, angle_2,
|
|
angle_step, 0 /* no move */);
|
|
}
|
|
|
|
/**
|
|
* cogl_path_arc_rel:
|
|
* @center_x: X offset from the current pen location of the elliptical
|
|
* arc center
|
|
* @center_y: Y offset from the current pen location of the elliptical
|
|
* arc center
|
|
* @radius_x: X radius of the elliptical arc
|
|
* @radius_y: Y radious 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
|
|
* @angle_step: Angle increment resolution for subdivision
|
|
*
|
|
* 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.
|
|
**/
|
|
void
|
|
cogl_path_arc_rel (ClutterFixed center_x,
|
|
ClutterFixed center_y,
|
|
ClutterFixed radius_x,
|
|
ClutterFixed radius_y,
|
|
ClutterAngle angle_1,
|
|
ClutterAngle angle_2,
|
|
ClutterAngle angle_step)
|
|
{
|
|
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
|
|
|
|
_cogl_arc (ctx->path_pen.x + center_x,
|
|
ctx->path_pen.y + center_y,
|
|
radius_x, radius_y,
|
|
angle_1, angle_2,
|
|
angle_step, 0 /* no move */);
|
|
}
|
|
|
|
/**
|
|
* cogl_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 radious 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
|
|
* @angle_step: Angle increment resolution for subdivision
|
|
*
|
|
* Clears the previously constructed shape and constructs and elliptical arc
|
|
* shape.
|
|
**/
|
|
void
|
|
cogl_arc (ClutterFixed center_x,
|
|
ClutterFixed center_y,
|
|
ClutterFixed radius_x,
|
|
ClutterFixed radius_y,
|
|
ClutterAngle angle_1,
|
|
ClutterAngle angle_2,
|
|
ClutterAngle angle_step)
|
|
{
|
|
_cogl_arc (center_x, center_y,
|
|
radius_x, radius_y,
|
|
angle_1, angle_2,
|
|
angle_step, 1 /* move first */);
|
|
}
|
|
|
|
/**
|
|
* cogl_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
|
|
* @angle_step: Angle increment resolution for subdivision
|
|
*
|
|
* Clears the previously constructed shape and constructs an ellipse
|
|
* shape.
|
|
**/
|
|
void
|
|
cogl_ellipse (ClutterFixed center_x,
|
|
ClutterFixed center_y,
|
|
ClutterFixed radius_x,
|
|
ClutterFixed radius_y,
|
|
ClutterAngle angle_step)
|
|
{
|
|
|
|
/* FIXME: if shows to be slow might be optimized
|
|
* by mirroring just a quarter of it */
|
|
|
|
_cogl_arc (center_x, center_y,
|
|
radius_x, radius_y,
|
|
0, CLUTTER_ANGLE_FROM_DEG(360),
|
|
angle_step, 1 /* move first */);
|
|
|
|
cogl_path_close();
|
|
}
|
|
|
|
/**
|
|
* cogl_round_rectangle:
|
|
* @x: X coordinate of the top-left corner
|
|
* @y: Y coordinate of the top-left corner
|
|
* @width: Width of the rectangle
|
|
* @height: Height of the rectangle
|
|
* @radius: Radius of the corner arcs.
|
|
* @arc_step: Angle increment resolution for subdivision of
|
|
* the corner arcs.
|
|
*
|
|
* Clears the previously constructed shape and constructs a rectangular
|
|
* shape with rounded corners.
|
|
**/
|
|
void
|
|
cogl_round_rectangle (ClutterFixed x,
|
|
ClutterFixed y,
|
|
ClutterFixed width,
|
|
ClutterFixed height,
|
|
ClutterFixed radius,
|
|
ClutterAngle arc_step)
|
|
{
|
|
ClutterFixed inner_width = width - (radius << 1);
|
|
ClutterFixed inner_height = height - (radius << 1);
|
|
|
|
cogl_path_move_to (x, y + radius);
|
|
cogl_path_arc_rel (radius, 0,
|
|
radius, radius,
|
|
CLUTTER_ANGLE_FROM_DEG (180),
|
|
CLUTTER_ANGLE_FROM_DEG (270),
|
|
arc_step);
|
|
|
|
cogl_path_h_line_to_rel (inner_width);
|
|
cogl_path_arc_rel (0, radius,
|
|
radius, radius,
|
|
CLUTTER_ANGLE_FROM_DEG (-90),
|
|
CLUTTER_ANGLE_FROM_DEG (0),
|
|
arc_step);
|
|
|
|
cogl_path_v_line_to_rel (inner_height);
|
|
cogl_path_arc_rel (-radius, 0,
|
|
radius, radius,
|
|
CLUTTER_ANGLE_FROM_DEG (0),
|
|
CLUTTER_ANGLE_FROM_DEG (90),
|
|
arc_step);
|
|
|
|
cogl_path_h_line_to_rel (-inner_width);
|
|
cogl_path_arc_rel (0, -radius,
|
|
radius, radius,
|
|
CLUTTER_ANGLE_FROM_DEG (90),
|
|
CLUTTER_ANGLE_FROM_DEG (180),
|
|
arc_step);
|
|
|
|
cogl_path_close ();
|
|
}
|
|
|
|
static void
|
|
_cogl_path_bezier2_sub (CoglBezQuad *quad)
|
|
{
|
|
CoglBezQuad quads[_COGL_MAX_BEZ_RECURSE_DEPTH];
|
|
CoglBezQuad *qleft;
|
|
CoglBezQuad *qright;
|
|
CoglBezQuad *q;
|
|
CoglFixedVec2 mid;
|
|
CoglFixedVec2 dif;
|
|
CoglFixedVec2 c1;
|
|
CoglFixedVec2 c2;
|
|
CoglFixedVec2 c3;
|
|
gint qindex;
|
|
|
|
/* Put first curve on stack */
|
|
quads[0] = *quad;
|
|
qindex = 0;
|
|
|
|
/* While stack is not empty */
|
|
while (qindex >= 0)
|
|
{
|
|
|
|
q = &quads[qindex];
|
|
|
|
/* Calculate distance of control point from its
|
|
* counterpart on the line between end points */
|
|
mid.x = ((q->p1.x + q->p3.x) >> 1);
|
|
mid.y = ((q->p1.y + q->p3.y) >> 1);
|
|
dif.x = (q->p2.x - mid.x);
|
|
dif.y = (q->p2.y - mid.y);
|
|
if (dif.x < 0) dif.x = -dif.x;
|
|
if (dif.y < 0) dif.y = -dif.y;
|
|
|
|
/* Cancel if the curve is flat enough */
|
|
if (dif.x + dif.y <= CFX_ONE
|
|
|| qindex == _COGL_MAX_BEZ_RECURSE_DEPTH - 1)
|
|
{
|
|
/* Add subdivision point (skip last) */
|
|
if (qindex == 0) return;
|
|
_cogl_path_add_node (q->p3.x, q->p3.y);
|
|
--qindex; continue;
|
|
}
|
|
|
|
/* Left recursion goes on top of stack! */
|
|
qright = q; qleft = &quads[++qindex];
|
|
|
|
/* Subdivide into 2 sub-curves */
|
|
c1.x = ((q->p1.x + q->p2.x) >> 1);
|
|
c1.y = ((q->p1.y + q->p2.y) >> 1);
|
|
c3.x = ((q->p2.x + q->p3.x) >> 1);
|
|
c3.y = ((q->p2.y + q->p3.y) >> 1);
|
|
c2.x = ((c1.x + c3.x) >> 1);
|
|
c2.y = ((c1.y + c3.y) >> 1);
|
|
|
|
/* Add left recursion onto stack */
|
|
qleft->p1 = q->p1;
|
|
qleft->p2 = c1;
|
|
qleft->p3 = c2;
|
|
|
|
/* Add right recursion onto stack */
|
|
qright->p1 = c2;
|
|
qright->p2 = c3;
|
|
qright->p3 = q->p3;
|
|
}
|
|
}
|
|
|
|
static void
|
|
_cogl_path_bezier3_sub (CoglBezCubic *cubic)
|
|
{
|
|
CoglBezCubic cubics[_COGL_MAX_BEZ_RECURSE_DEPTH];
|
|
CoglBezCubic *cleft;
|
|
CoglBezCubic *cright;
|
|
CoglBezCubic *c;
|
|
CoglFixedVec2 dif1;
|
|
CoglFixedVec2 dif2;
|
|
CoglFixedVec2 mm;
|
|
CoglFixedVec2 c1;
|
|
CoglFixedVec2 c2;
|
|
CoglFixedVec2 c3;
|
|
CoglFixedVec2 c4;
|
|
CoglFixedVec2 c5;
|
|
gint cindex;
|
|
|
|
/* Put first curve on stack */
|
|
cubics[0] = *cubic;
|
|
cindex = 0;
|
|
|
|
while (cindex >= 0)
|
|
{
|
|
c = &cubics[cindex];
|
|
|
|
#define CFX_MUL2(x) ((x) << 1)
|
|
#define CFX_MUL3(x) (((x) << 1) + (x))
|
|
#define CFX_SQ(x) CFX_MUL (x, x)
|
|
|
|
/* Calculate distance of control points from their
|
|
* counterparts on the line between end points */
|
|
dif1.x = CFX_MUL3 (c->p2.x) - CFX_MUL2 (c->p1.x) - c->p4.x;
|
|
dif1.y = CFX_MUL3 (c->p2.y) - CFX_MUL2 (c->p1.y) - c->p4.y;
|
|
dif2.x = CFX_MUL3 (c->p3.x) - CFX_MUL2 (c->p4.x) - c->p1.x;
|
|
dif2.y = CFX_MUL3 (c->p3.y) - CFX_MUL2 (c->p4.y) - c->p1.y;
|
|
if (dif1.x < 0) dif1.x = -dif1.x;
|
|
if (dif1.y < 0) dif1.y = -dif1.y;
|
|
if (dif2.x < 0) dif2.x = -dif2.x;
|
|
if (dif2.y < 0) dif2.y = -dif2.y;
|
|
|
|
#undef CFX_MUL2
|
|
#undef CFX_MUL3
|
|
#undef CFX_SQ
|
|
|
|
/* Pick the greatest of two distances */
|
|
if (dif1.x < dif2.x) dif1.x = dif2.x;
|
|
if (dif1.y < dif2.y) dif1.y = dif2.y;
|
|
|
|
/* Cancel if the curve is flat enough */
|
|
if (dif1.x + dif1.y <= CFX_ONE
|
|
|| cindex == _COGL_MAX_BEZ_RECURSE_DEPTH-1)
|
|
{
|
|
/* Add subdivision point (skip last) */
|
|
if (cindex == 0) return;
|
|
_cogl_path_add_node (c->p4.x, c->p4.y);
|
|
--cindex; continue;
|
|
}
|
|
|
|
/* Left recursion goes on top of stack! */
|
|
cright = c; cleft = &cubics[++cindex];
|
|
|
|
/* Subdivide into 2 sub-curves */
|
|
c1.x = ((c->p1.x + c->p2.x) >> 1);
|
|
c1.y = ((c->p1.y + c->p2.y) >> 1);
|
|
mm.x = ((c->p2.x + c->p3.x) >> 1);
|
|
mm.y = ((c->p2.y + c->p3.y) >> 1);
|
|
c5.x = ((c->p3.x + c->p4.x) >> 1);
|
|
c5.y = ((c->p3.y + c->p4.y) >> 1);
|
|
|
|
c2.x = ((c1.x + mm.x) >> 1);
|
|
c2.y = ((c1.y + mm.y) >> 1);
|
|
c4.x = ((mm.x + c5.x) >> 1);
|
|
c4.y = ((mm.y + c5.y) >> 1);
|
|
|
|
c3.x = ((c2.x + c4.x) >> 1);
|
|
c3.y = ((c2.y + c4.y) >> 1);
|
|
|
|
/* Add left recursion to stack */
|
|
cleft->p1 = c->p1;
|
|
cleft->p2 = c1;
|
|
cleft->p3 = c2;
|
|
cleft->p4 = c3;
|
|
|
|
/* Add right recursion to stack */
|
|
cright->p1 = c3;
|
|
cright->p2 = c4;
|
|
cright->p3 = c5;
|
|
cright->p4 = c->p4;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* cogl_path_bezier2_to:
|
|
* @x1: X coordinate of the second bezier control point
|
|
* @y1: Y coordinate of the second bezier control point
|
|
* @x2: X coordinate of the third bezier control point
|
|
* @y2: Y coordinate of the third bezier control point
|
|
*
|
|
* Adds a quadratic bezier curve segment to the current path with the given
|
|
* second and third control points and using current pen location as the
|
|
* first control point.
|
|
**/
|
|
void
|
|
cogl_path_bezier2_to (ClutterFixed x1,
|
|
ClutterFixed y1,
|
|
ClutterFixed x2,
|
|
ClutterFixed y2)
|
|
{
|
|
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
|
|
|
|
CoglBezQuad quad;
|
|
|
|
/* Prepare quadratic curve */
|
|
quad.p1 = ctx->path_pen;
|
|
quad.p2.x = x1;
|
|
quad.p2.y = y1;
|
|
quad.p3.x = x2;
|
|
quad.p3.y = y2;
|
|
|
|
/* Run subdivision */
|
|
_cogl_path_bezier2_sub (&quad);
|
|
|
|
/* Add last point */
|
|
_cogl_path_add_node (quad.p3.x, quad.p3.y);
|
|
ctx->path_pen = quad.p3;
|
|
}
|
|
|
|
/**
|
|
* cogl_path_bezier3_to:
|
|
* @x1: X coordinate of the second bezier control point
|
|
* @y1: Y coordinate of the second bezier control point
|
|
* @x2: X coordinate of the third bezier control point
|
|
* @y2: Y coordinate of the third bezier control point
|
|
* @x3: X coordinate of the fourth bezier control point
|
|
* @y3: 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_bezier3_to (ClutterFixed x1,
|
|
ClutterFixed y1,
|
|
ClutterFixed x2,
|
|
ClutterFixed y2,
|
|
ClutterFixed x3,
|
|
ClutterFixed y3)
|
|
{
|
|
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
|
|
|
|
CoglBezCubic cubic;
|
|
|
|
/* Prepare cubic curve */
|
|
cubic.p1 = ctx->path_pen;
|
|
cubic.p2.x = x1;
|
|
cubic.p2.y = y1;
|
|
cubic.p3.x = x2;
|
|
cubic.p3.y = y2;
|
|
cubic.p4.x = x3;
|
|
cubic.p4.y = y3;
|
|
|
|
/* Run subdivision */
|
|
_cogl_path_bezier3_sub (&cubic);
|
|
|
|
/* Add last point */
|
|
_cogl_path_add_node (cubic.p4.x, cubic.p4.y);
|
|
ctx->path_pen = cubic.p4;
|
|
}
|
|
|
|
/**
|
|
* cogl_path_bezier2_to_rel:
|
|
* @x1: X coordinate of the second bezier control point
|
|
* @y1: Y coordinate of the second bezier control point
|
|
* @x2: X coordinate of the third bezier control point
|
|
* @y2: Y coordinate of the third bezier control point
|
|
*
|
|
* Adds a quadratic bezier curve segment to the current path with the given
|
|
* second and third 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_bezier2_to_rel (ClutterFixed x1,
|
|
ClutterFixed y1,
|
|
ClutterFixed x2,
|
|
ClutterFixed y2)
|
|
{
|
|
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
|
|
|
|
cogl_path_bezier2_to (ctx->path_pen.x + x1,
|
|
ctx->path_pen.y + y2,
|
|
ctx->path_pen.x + x2,
|
|
ctx->path_pen.y + y2);
|
|
}
|
|
|
|
/**
|
|
* cogl_path_bezier3_to_rel:
|
|
* @x1: X coordinate of the second bezier control point
|
|
* @y1: Y coordinate of the second bezier control point
|
|
* @x2: X coordinate of the third bezier control point
|
|
* @y2: Y coordinate of the third bezier control point
|
|
* @x3: X coordinate of the fourth bezier control point
|
|
* @y3: 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_bezier3_to_rel (ClutterFixed x1,
|
|
ClutterFixed y1,
|
|
ClutterFixed x2,
|
|
ClutterFixed y2,
|
|
ClutterFixed x3,
|
|
ClutterFixed y3)
|
|
{
|
|
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
|
|
|
|
cogl_path_bezier3_to (ctx->path_pen.x + x1,
|
|
ctx->path_pen.y + y2,
|
|
ctx->path_pen.x + x2,
|
|
ctx->path_pen.y + y2,
|
|
ctx->path_pen.x + x3,
|
|
ctx->path_pen.y + y3);
|
|
}
|