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mutter/cogl-path/tesselator/tess.h
Robert Bragg 7365c3aa77 Separate out CoglPath api into sub-library 
This splits out the cogl_path_ api into a separate cogl-path sub-library
like cogl-pango and cogl-gst. This enables developers to build Cogl with
this sub-library disabled if they don't need it which can be useful when
its important to keep the size of an application and its dependencies
down to a minimum. The functions cogl_framebuffer_{fill,stroke}_path
have been renamed to cogl_path_{fill,stroke}.

There were a few places in core cogl and cogl-gst that referenced the
CoglPath api and these have been decoupled by using the CoglPrimitive
api instead. In the case of cogl_framebuffer_push_path_clip() the core
clip stack no longer accepts path clips directly but it's now possible
to get a CoglPrimitive for the fill of a path and so the implementation
of cogl_framebuffer_push_path_clip() now lives in cogl-path and works as
a shim that first gets a CoglPrimitive and uses
cogl_framebuffer_push_primitive_clip instead.

We may want to consider renaming cogl_framebuffer_push_path_clip to
put it in the cogl_path_ namespace.

Reviewed-by: Neil Roberts <neil@linux.intel.com>

(cherry picked from commit 8aadfd829239534fb4ec8255cdea813d698c5a3f)

So as to avoid breaking the 1.x API or even the ABI since we are quite
late in the 1.16 development cycle the patch was modified to build
cogl-path as a noinst_LTLIBRARY before building cogl and link the code
directly into libcogl.so as it was previously. This way we can wait
until the start of the 1.18 cycle before splitting the code into a
separate libcogl-path.so.

This also adds shims for cogl_framebuffer_fill/stroke_path() to avoid
breaking the 1.x API/ABI.
2013-08-19 22:44:35 +01:00

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/*
* SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
* Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice including the dates of first publication and
* either this permission notice or a reference to
* http://oss.sgi.com/projects/FreeB/
* shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Except as contained in this notice, the name of Silicon Graphics, Inc.
* shall not be used in advertising or otherwise to promote the sale, use or
* other dealings in this Software without prior written authorization from
* Silicon Graphics, Inc.
*/
/*
** Author: Eric Veach, July 1994.
**
*/
#ifndef __tess_h_
#define __tess_h_
#include <GL/glu.h>
#include <setjmp.h>
#include "mesh.h"
#include "dict.h"
#include "priorityq.h"
/* The begin/end calls must be properly nested. We keep track of
* the current state to enforce the ordering.
*/
enum TessState { T_DORMANT, T_IN_POLYGON, T_IN_CONTOUR };
/* We cache vertex data for single-contour polygons so that we can
* try a quick-and-dirty decomposition first.
*/
#define TESS_MAX_CACHE 100
typedef struct CachedVertex {
GLdouble coords[3];
void *data;
} CachedVertex;
struct GLUtesselator {
/*** state needed for collecting the input data ***/
enum TessState state; /* what begin/end calls have we seen? */
GLUhalfEdge *lastEdge; /* lastEdge->Org is the most recent vertex */
GLUmesh *mesh; /* stores the input contours, and eventually
the tessellation itself */
void (GLAPIENTRY *callError)( GLenum errnum );
/*** state needed for projecting onto the sweep plane ***/
GLdouble normal[3]; /* user-specified normal (if provided) */
GLdouble sUnit[3]; /* unit vector in s-direction (debugging) */
GLdouble tUnit[3]; /* unit vector in t-direction (debugging) */
/*** state needed for the line sweep ***/
GLdouble relTolerance; /* tolerance for merging features */
GLenum windingRule; /* rule for determining polygon interior */
GLboolean fatalError; /* fatal error: needed combine callback */
Dict *dict; /* edge dictionary for sweep line */
PriorityQ *pq; /* priority queue of vertex events */
GLUvertex *event; /* current sweep event being processed */
void (GLAPIENTRY *callCombine)( GLdouble coords[3], void *data[4],
GLfloat weight[4], void **outData );
/*** state needed for rendering callbacks (see render.c) ***/
GLboolean flagBoundary; /* mark boundary edges (use EdgeFlag) */
GLboolean boundaryOnly; /* Extract contours, not triangles */
GLUface *lonelyTriList;
/* list of triangles which could not be rendered as strips or fans */
void (GLAPIENTRY *callBegin)( GLenum type );
void (GLAPIENTRY *callEdgeFlag)( GLboolean boundaryEdge );
void (GLAPIENTRY *callVertex)( void *data );
void (GLAPIENTRY *callEnd)( void );
void (GLAPIENTRY *callMesh)( GLUmesh *mesh );
/*** state needed to cache single-contour polygons for renderCache() */
GLboolean emptyCache; /* empty cache on next vertex() call */
int cacheCount; /* number of cached vertices */
CachedVertex cache[TESS_MAX_CACHE]; /* the vertex data */
/*** rendering callbacks that also pass polygon data ***/
void (GLAPIENTRY *callBeginData)( GLenum type, void *polygonData );
void (GLAPIENTRY *callEdgeFlagData)( GLboolean boundaryEdge,
void *polygonData );
void (GLAPIENTRY *callVertexData)( void *data, void *polygonData );
void (GLAPIENTRY *callEndData)( void *polygonData );
void (GLAPIENTRY *callErrorData)( GLenum errnum, void *polygonData );
void (GLAPIENTRY *callCombineData)( GLdouble coords[3], void *data[4],
GLfloat weight[4], void **outData,
void *polygonData );
jmp_buf env; /* place to jump to when memAllocs fail */
void *polygonData; /* client data for current polygon */
};
void GLAPIENTRY __gl_noBeginData( GLenum type, void *polygonData );
void GLAPIENTRY __gl_noEdgeFlagData( GLboolean boundaryEdge, void *polygonData );
void GLAPIENTRY __gl_noVertexData( void *data, void *polygonData );
void GLAPIENTRY __gl_noEndData( void *polygonData );
void GLAPIENTRY __gl_noErrorData( GLenum errnum, void *polygonData );
void GLAPIENTRY __gl_noCombineData( GLdouble coords[3], void *data[4],
GLfloat weight[4], void **outData,
void *polygonData );
#define CALL_BEGIN_OR_BEGIN_DATA(a) \
if (tess->callBeginData != &__gl_noBeginData) \
(*tess->callBeginData)((a),tess->polygonData); \
else (*tess->callBegin)((a));
#define CALL_VERTEX_OR_VERTEX_DATA(a) \
if (tess->callVertexData != &__gl_noVertexData) \
(*tess->callVertexData)((a),tess->polygonData); \
else (*tess->callVertex)((a));
#define CALL_EDGE_FLAG_OR_EDGE_FLAG_DATA(a) \
if (tess->callEdgeFlagData != &__gl_noEdgeFlagData) \
(*tess->callEdgeFlagData)((a),tess->polygonData); \
else (*tess->callEdgeFlag)((a));
#define CALL_END_OR_END_DATA() \
if (tess->callEndData != &__gl_noEndData) \
(*tess->callEndData)(tess->polygonData); \
else (*tess->callEnd)();
#define CALL_COMBINE_OR_COMBINE_DATA(a,b,c,d) \
if (tess->callCombineData != &__gl_noCombineData) \
(*tess->callCombineData)((a),(b),(c),(d),tess->polygonData); \
else (*tess->callCombine)((a),(b),(c),(d));
#define CALL_ERROR_OR_ERROR_DATA(a) \
if (tess->callErrorData != &__gl_noErrorData) \
(*tess->callErrorData)((a),tess->polygonData); \
else (*tess->callError)((a));
#endif
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