path: root/ChangeLog

2004-10-25  Keith Packard  <keithp@keithp.com>

	* Makefile.am:
	* twin.h:
	* twin_box.c: (_twin_box_init), (_twin_box_query_geometry),
	(_twin_box_configure), (_twin_box_xy_to_widget),
	(_twin_box_dispatch), (twin_box_create):
	* twin_label.c: (_twin_label_query_geometry), (_twin_label_paint),
	(_twin_label_dispatch), (twin_label_set), (_twin_label_init),
	(twin_label_create):
	* twin_toplevel.c: (_twin_toplevel_dispatch),
	(_twin_toplevel_event), (_twin_toplevel_draw),
	(_twin_toplevel_destroy), (_twin_toplevel_init),
	(twin_toplevel_create), (_twin_toplevel_paint),
	(_twin_toplevel_queue_paint), (_twin_toplevel_layout),
	(_twin_toplevel_queue_layout), (twin_toplevel_show):
	* twin_widget.c: (_twin_widget_paint), (_twin_widget_dispatch),
	(_twin_widget_init), (_twin_widget_queue_paint),
	(_twin_widget_queue_layout), (twin_widget_create),
	(twin_widget_set):
	* twinint.h:
	Add initial widget implementation.
	
	* twin_glyphs.c:
	Fix numbers to have the same width.

	* twin_pixmap.c: (twin_pixmap_set_clip):
	Add new relative-origin clip setting function
	
	* twin_screen.c: (twin_screen_set_active), (twin_screen_dispatch):
	* twin_window.c: (twin_window_create), (twin_window_style_size),
	(twin_window_draw), (twin_window_dispatch):
	* twin_x11.c: (twin_x11_read_events):
	* twin_clock.c: (twin_clock_start):
	* twin_demo.c: (twin_example_start), (twin_line_start),
	(twin_circletext_start), (twin_quickbrown_start),
	(twin_ascii_start), (twin_jelly_start):
	* twin_text.c: (twin_text_start):
	Change enumerated constants to include Twin prefix
	
	* twin_hello.c: (_twin_hello_timeout), (twin_hello_start):
	Add new widget-based demo
	
	* xtwin.c: (main):
	Start widget based demo

2004-10-25  Keith Packard  <keithp@keithp.com>

	* Makefile.am:
	* configure.ac:
	* twin_dispatch.c: (twin_dispatch):
	* twin_file.c: (_twin_file_order), (_twin_run_file),
	(twin_set_file), (twin_clear_file):
	* twin_queue.c: (_twin_queue_insert), (_twin_queue_remove),
	(_twin_queue_delete), (_twin_queue_set_order),
	(_twin_queue_review_order):
	* twin_timeout.c: (_twin_timeout_order), (_twin_queue_timeout),
	(_twin_run_timeout), (twin_set_timeout), (twin_clear_timeout),
	(_twin_timeout_delay), (twin_now):
	* twin_work.c: (_twin_work_order), (_twin_queue_work),
	(_twin_run_work), (twin_set_work), (twin_clear_work):
	* twinint.h:
	Add dispatch stuff to manage timeouts, workprocs and files.
	Remove thread stuff
	
	* twin.h:
	* twin_clock.c: (twin_clock_set_transform), (twin_clock_hand),
	(twin_clock_minute_angle), (twin_clock_face), (twin_clock_timeout),
	(twin_clock_start):
	* twin_clock.h:
	* twin_demo.c: (twin_example_start), (twin_line_start),
	(twin_circletext_start), (twin_quickbrown_start),
	(twin_ascii_start), (twin_jelly_start), (twin_extents_start),
	(twin_demo_start):
	* twin_demo.h:
	* twin_text.c: (twin_text_start):
	* twin_text.h:
	* xtwin.c: (main):
	Split demos into separate files
	
	* twin_draw.c: (twin_composite), (twin_fill):
	Make drawing origin match clip rectangle.

	* twin_fedit
	Add glyph editor to CVS to preserve it
	
	* twin_icon.c: (twin_icon_draw):
	Add scalable icons

	* twin_path.c: (_twin_path_sfinish), (_twin_path_smove),
	(twin_path_close), (twin_path_circle), (twin_path_ellipse),
	(twin_path_append), (twin_composite_path):
	Separate 'closing' a subpath from 'finishing' a subpath; the
	former adds a point back to the start while the latter just
	leaves the path unclosed and prepares for a new subpath.
	
	* twin_pixmap.c: (twin_pixmap_create), (twin_pixmap_show),
	(twin_pixmap_hide), (twin_pixmap_clip), (twin_pixmap_current_clip),
	(twin_pixmap_restore_clip), (twin_pixmap_reset_clip),
	(twin_pixmap_damage), (twin_pixmap_move):
	* twin_poly.c: (_twin_edge_build), (_span_fill), (_twin_edge_fill),
	(twin_fill_path):
	* twin_screen.c: (twin_screen_create):
	Eliminate locking, add clipping.

	* twin_window.c: (twin_window_create), (twin_window_configure),
	(twin_window_frame):
	Clean up title drawing, use clipping
	
	* twin_x11.c: (twin_x11_read_events), (twin_x11_work),
	(twin_x11_create), (twin_x11_destroy), (twin_x11_damage):
	* twin_x11.h:
	Eliminate locking, use dispatch stuff

2004-10-05  Keith Packard  <keithp@keithp.com>

	* Makefile.am:
	* twin.h:
	* twin_pattern.c: (twin_make_pattern):
	* twin_pixmap.c: (twin_pixmap_create_const):
	Add patterns.
	
	* twin_screen.c: (twin_screen_create), (twin_screen_update),
	(twin_screen_set_background), (twin_screen_get_background):
	Add screen backgrounds
	
	* twin_window.c: (twin_window_create), (twin_window_style_size),
	(twin_window_frame), (twin_window_draw):
	Eliminate spurious border bits
	
	* xtwin.c: (twin_clock), (twin_text_app), (twin_start_clock),
	(main):
	Add text display applet

2004-10-05  Keith Packard  <keithp@keithp.com>

	* Makefile.am:
	* twin.h:
	* twin_draw.c: (twin_fill):
	* twin_path.c: (twin_composite_path):
	* twin_pixmap.c: (twin_pixmap_create), (twin_pixmap_show),
	(twin_pixmap_hide), (_twin_pixmap_fetch),
	(twin_pixmap_transparent), (twin_pixmap_move),
	(twin_pixmap_dispatch):
	* twin_screen.c: (twin_screen_create), (twin_screen_lock),
	(twin_screen_unlock), (twin_screen_update),
	(twin_screen_set_active), (twin_screen_get_active),
	(twin_screen_dispatch):
	* twin_thread.c: (twin_mutex_init), (twin_mutex_lock),
	(twin_mutex_unlock), (twin_cond_init), (twin_cond_broadcast),
	(twin_cond_wait), (twin_thread_create):
	* twin_window.c: (twin_window_create), (twin_window_destroy),
	(twin_window_show), (twin_window_hide), (twin_window_configure),
	(twin_window_style_size), (twin_window_set_name),
	(twin_window_frame), (twin_window_draw), (twin_window_dispatch):
	* twin_x11.c: (_twin_x11_put_begin), (_twin_x11_put_span),
	(twin_x11_damage_thread), (twin_x11_event_thread),
	(twin_x11_screen_damaged), (twin_x11_create), (twin_x11_destroy):
	* twin_x11.h:
	* xtwin.c: (twin_clock_set_transform), (twin_clock_hand),
	(twin_clock_face), (twin_clock), (twin_app_thread),
	(twin_start_app), (twin_start_clock), (main):
	Add the beginings of event dispatch and a bit of
	window management including titles.  Default event dispatcher
	does restacking and motion.

2004-10-05  Keith Packard  <keithp@keithp.com>

	* twin.h:
	* twin_draw.c: (twin_composite), (twin_fill):
	* twin_matrix.c: (twin_matrix_multiply), (twin_matrix_translate),
	(twin_matrix_scale), (twin_matrix_rotate):
	* twin_path.c: (twin_path_ellipse), (twin_path_set_font_style),
	(twin_composite_path), (twin_composite_stroke):
	* twin_pixmap.c: (twin_pixmap_create), (twin_pixmap_pointer),
	(twin_pixmap_damage), (twin_pixmap_move):
	* twin_poly.c: (twin_fill_path):
	* twin_screen.c: (twin_screen_create), (twin_screen_damage),
	(twin_screen_resize), (twin_screen_update):
	* twin_x11.c: (_twin_x11_put_begin), (_twin_x11_put_span):
	* twinint.h:
	Update API to use twin_ types for most everything.
	
	* twin_font.c: (_twin_text_compute_info),
	(_twin_text_compute_snap), (_twin_text_compute_pen), (_twin_snap),
	(twin_has_ucs4), (_twin_glyph_width), (twin_text_metrics_ucs4),
	(twin_path_ucs4):
	Rework snapping to correctly snap vertical and horizontal text
	on pixel boundaries.
	
	* xtwin.c: (main):
	Change clock watermark

2004-10-04  Keith Packard  <keithp@keithp.com>

	* twin_primitive.c: (in_over), (over):
	* twinint.h:
	Recognize a few special cases to speed up operations
	
	* xtwin.c: (twin_clock_set_transform), (twin_clock_minute_angle),
	(twin_clock_face), (twin_clock):
	Fix angular problems in hand position by rotating everything 90
	degrees.

2004-10-04  Keith Packard  <keithp@keithp.com>

	* twin_font.c: (twin_has_ucs4), (twin_path_ucs4):
	Delete old glyph representation support code.
	
	* twin_geom.c: (_twin_distance_to_line_squared):
	Oops -- overflow not handled correctly in distance functions.
	
	* twin_glyphs.c:
	Replace new glyphs with versions using splines.

	* xtwin.c: (main):
	Whack around the default presentation a bit more

2004-10-04  Keith Packard  <keithp@keithp.com>

	* twin.h:
	* twin_draw.c: (twin_composite):
	Fix a clipping bug
	
	* twinint.h:
	* twin_font.c: (_snap), (_twin_g_base), (_twin_pen_size),
	(twin_text_metrics_ucs4), (twin_add_snap), (twin_n_in_spline),
	(twin_spline_fit), (_ucs4_string), (px), (py), (twin_dump_glyphs),
	(twin_path_ucs4), (twin_text_metrics_utf8):
	* twin_glyphs.c:
	Change glyph representation to allow splines and include metrics.

	* twin_matrix.c: (_twin_matrix_expand):
	* twin_path.c: (twin_path_rmove), (twin_path_rdraw):
	Add some new helper functions.
	
	* twin_spline.c:
	Expose _twin_path_scurve for glyphs
	
	* twin_trig.c:
	Increase sin table precision.
	
	* twin_x11.c: (_twin_x11_put_span), (twin_x11_screen_damaged),
	(twin_x11_damage):
	Fix off-by-one error in y position.
	Lock screen while adding expose damage
	
	* xtwin.c: (twin_clock_face), (twin_clock), (main):
	Change clock appearance.  Use corrected glyph metrics

2004-10-01  Keith Packard  <keithp@keithp.com>

	* twin.h:
	* twin_fixed.c:
	* twin_font.c: (twin_text_metrics_ucs4), (twin_path_ucs4),
	(twin_text_metrics_utf8):
	* twin_screen.c: (twin_screen_create), (twin_screen_update):
	* twin_x11.c: (_twin_x11_put_begin), (_twin_x11_put_span),
	* twin_x11.h:
	(twin_x11_create):
	Add put_begin to screen structure so that the backend can batch
	updates.
	Add twin_int_to_fixed.
	Inline twin_fixed_mul and twin_fixed_div using int64_t.
	Add twin_text_metrics_utf8.
	Hard-code the max number of vertices in a glyph.
	Set various ICCCM properties to make X wms happy.

	* twin_path.c: (_twin_matrix_max_radius), (twin_path_circle):
	Use better approximation of ellipse major axis radius when
	drawing circles.
	
	* twin_poly.c: (_twin_edge_fill):
	Compiler warning.

	* twinint.h:
	Delete duplicate twin_over definition
	
	* xtwin.c: (twin_clock_hand), (twin_clock_face), (twin_clock),
	(twin_app_thread), (twin_start_app), (twin_start_clock), (main):
	Allow for multiple clocks, and add watermark.  Note that
	text metrics are quite broken currently.

2004-09-30  Keith Packard  <keithp@keithp.com>

	* Makefile.am:
	* configure.ac:
	* twin.h:
	* twin_draw.c: (twin_composite), (twin_fill):
	* twin_font.c: (_snap), (_twin_pen_size), (twin_text_metrics_ucs4),
	(twin_path_ucs4), (twin_width_utf8):
	Handle unhinted text.
	
	* twin_path.c: (twin_path_close), (twin_path_bounds),
	(twin_composite_path), (twin_paint_path), (twin_composite_stroke),
	(twin_paint_stroke):
	Add helper functions 
	
	* twin_pixmap.c: (twin_pixmap_create), (twin_pixmap_show),
	(twin_pixmap_hide), (twin_pixmap_enable_update),
	(twin_pixmap_disable_update), (twin_pixmap_lock),
	(twin_pixmap_unlock):
	Lock pixmaps during drawing
	
	* twin_poly.c: (_twin_edge_build), (twin_fill_path):
	* twin_screen.c: (twin_screen_create), (twin_screen_lock),
	(twin_screen_unlock), (twin_screen_register_damaged),
	(twin_screen_enable_update), (twin_screen_disable_update),
	(twin_screen_damage), (twin_screen_update):
	Disable screen updates while applications are busy
	
	* twin_x11.c: (twin_x11_damage_thread), (twin_x11_event_thread),
	(twin_x11_screen_damaged), (twin_x11_create), (twin_x11_destroy):
	Add threads to manage events and redisplay

	* twinint.h:
	* xtwin.c: (twin_clock_hand), (twin_clock_minute_angle),
	(twin_clock_face), (twin_clock), (main):
	Paint a clock

2004-09-27  Keith Packard  <keithp@keithp.com>

	* twin.h:
	* twin_fixed.c: (twin_fixed_div), (twin_fixed_sqrt),
	(_twin_sfixed_sqrt):
	Add some more fixed point functions
	
	* twin_font.c: (_snap), (_add_snap), (_twin_pen_size),
	(twin_text_metrics_ucs4), (twin_path_ucs4), (twin_width_ucs4):
	Reimplement text snapping.  Note that things are snapped to
	user units, not pixels.  Snapping to pixels requires some
	thought about rotating transformations.
	
	* twin_matrix.c: (_twin_matrix_len):
	* twin_path.c: (twin_path_close), (twin_path_circle):
	Oops.  Closed paths don't necessarily need to join ends,
	but circles do.
	
	* twinint.h:
	* xtwin.c: (main):
	Random new tests.

2004-09-27  Keith Packard  <keithp@keithp.com>

	* Makefile.am:
	* twin.h:
	* twin_convolve.c: (_twin_path_leftpoint), (_around_order),
	(_angle), (_twin_subpath_convolve):
	* twin_fixed.c: (twin_fixed_mul):
	* twin_font.c: (twin_path_ucs4), (twin_width_ucs4),
	(twin_path_utf8):
	* twin_geom.c: (_twin_distance_to_point_squared),
	(_twin_distance_to_line_squared):
	* twin_hull.c: (_twin_slope_init), (_twin_hull_create),
	(_twin_hull_vertex_compare), (_twin_hull_eliminate_concave),
	(_twin_hull_to_path):
	* twin_matrix.c: (_twin_dump_matrix), (_twin_matrix_multiply),
	(twin_matrix_identity), (twin_matrix_translate),
	(twin_matrix_scale), (_twin_matrix_determinant),
	(twin_matrix_rotate), (_twin_matrix_x), (_twin_matrix_y),
	(_twin_matrix_dx), (_twin_matrix_dy):
	* twin_path.c: (_twin_current_subpath_len),
	(_twin_path_current_spoint), (_twin_path_subpath_first_spoint),
	(_twin_path_smove), (_twin_path_sdraw), (twin_path_move),
	(twin_path_draw), (twin_path_close), (twin_path_circle),
	(twin_path_set_matrix), (twin_path_current_matrix),
	(twin_path_identity), (twin_path_translate), (twin_path_scale),
	(twin_path_rotate), (twin_path_set_font_size),
	(twin_path_current_font_size), (twin_path_set_font_style),
	(twin_path_current_font_style), (twin_path_append),
	(twin_path_save), (twin_path_restore), (twin_path_create):
	* twin_poly.c: (_edge_step_by), (_twin_sfixed_grid_ceil),
	(_twin_edge_build), (_span_fill), (_twin_edge_fill),
	(twin_fill_path):
	* twin_spline.c: (_lerp_half), (_de_casteljau),
	(_twin_spline_decompose), (_twin_path_scurve), (twin_path_curve):
	* twin_trig.c: (twin_sin), (twin_cos), (twin_tan):
	* twinint.h:
	* xtwin.c: (main):
	Add affine transformation support.
	Fix convex hull to eliminate all points colinear with extreme.
	Note that text snapping is currently broken.

2004-09-26  Keith Packard  <keithp@keithp.com>

	* twin_convolve.c: (_twin_subpath_convolve):
	Eliminate special case for closed paths.  Just draw caps at
	both ends and accept that the resulting path isn't minimal
	in all cases.  This eliminates the weird results from said
	attempted minimal path with large pens and small curves.
	It also eliminated a lot of extra code from this function.
	
	* twin_font.c: (twin_path_ucs4):
	Fix font baseline value (should be 9).  Take pen size
	into account when computing positions so that glyphs rest
	on the baseline instead of painting on top of it.

	* xtwin.c: (main):
	Show baseline in huge text sample

2004-09-26  Keith Packard  <keithp@keithp.com>

	* twin.h:
	* twin_convolve.c: (_twin_path_leftpoint), (_twin_path_step),
	(_twin_subpath_convolve):
	Hmm.  Not sure this is right, but I'm giving it a try.
	Recognize closed paths and attempt to construct two
	disjoint paths as their convolution with the pen.  This
	appears to break when the path has a radius of curvature smaller
	than the radius of the pen.  I'm committing it to CVS mostly
	so I don't lose the code; I will shortly commit a patch which
	eliminates the check for a closed path.

	Oh, one correct change is to _twin_path_leftpoint which used
	to try to be clever about point selection.  Now that pens are
	forced to be convex, the correct point to use is the one furthest
	from the line.
	
	* twin_path.c: (twin_path_fill), (twin_path_append):
	Ignore subpaths containing a single point.
	Add 'twin_path_append' to glue one path into another.

	* twin_poly.c: (_twin_edge_build), (_twin_edge_fill):
	Add debug output that shows vertices of polygons
	
	* xtwin.c: (main):
	Code to test convolution change mentioned above

2004-09-25  Keith Packard  <keithp@keithp.com>

	* twin_font.c:
	Spurious ) in file

2004-09-25  Keith Packard  <keithp@keithp.com>

	* twin_font.c: (_snap), (twin_path_ucs4):
	Reduce emboldening to +50% stroke thickness.
	Clean up debug code.
	Eliminate some dead code.
	Try to adjust width computations a bit.  Still not right.
	* xtwin.c: (main):
	draw in more colors

2004-09-24  Keith Packard  <keithp@keithp.com>

	* Makefile.am:
	* twin.h:
	Switch to just supporting stroke fonts
	* twin_font.c: (twin_has_ucs4), (_twin_ucs4_base),
	(_twin_ucs4_points), (twin_path_ucs4), (twin_ucs4_width),
	(twin_path_string):
	Finish needed stroke font API.
	
	* twin_glyphs.c:
	Elimiate all but ascii glyphs, use offset table to
	eliminate table of pointers (which can't be const)
	
	* twin_vera.c:
	Remove twin_vera.c
	
	* twinint.h:
	Change glyph structures around for offsets and ascii only
	
	* xtwin.c: (main):
	Few more cases to show ascii text support

2004-09-24  Keith Packard  <keithp@keithp.com>

	* Makefile.am:
	* twin_hull.c: (_twin_slope_init), (_twin_hull_create),
	(_twin_slope_compare), (_twin_hull_vertex_compare),
	(_twin_hull_prev_valid), (_twin_hull_next_valid),
	(_twin_hull_eliminate_concave), (_twin_hull_to_path),
	(twin_path_convex_hull):
	Add convex hull algorithm from cairo sources.  Used to
	constrain pens to convex shapes so that the convolution
	algorithm works correctly.

	* twin.h:
	Reduce default tolerance to 1/16 of a pixel
	
	* twin_convolve.c: (_angle), (_twin_subpath_convolve),
	(twin_path_convolve):
	Use convex hull of pen.

	* twin_font.c: (compare_snap), (_snap), (_add_snap),
	(twin_path_glyph), (twin_glyph_width), (twin_path_string):
	Snap horizontal and vertical elements of glyphs to
	pixel boundaries.  Snap stem widths to integer amounts.
	Add slanting and emboldening
	
	* twin_glyphs.c:
	Add space and box
	
	* twin_primitive.c:
	Avoid using __inline as it increases size dramatically
	
	* twin_spline.c: (_twin_spline_decompose):
	Use <= tolerance_squared as that may be zero
	
	* xtwin.c: (main):
	Swizzle code to show off recent changes

2004-09-23  Keith Packard  <keithp@keithp.com>

 	* Makefile.am:
	* configure.ac:
	* twin.h:
	Fix twin_fixed_floor to work for negative values correctly
	Add twin_path_cur_point
	
	* twin_convolve.c: (_twin_path_step), (_around_order), (_angle),
	(_twin_subpath_convolve), (twin_path_convolve):
	fix twin_path_step to actually handle duplicate points.
	Change 'clockwise' to 'around_order' so that all three possible
	results are returned (clockwise, parallel and counterclockwise)
	Handle disjoint strokes

	* twin_font.c: (twin_has_glyph), (twin_path_glyph),
	(twin_glyph_width), (twin_path_string), (twin_path_fglyph),
	(twin_path_ucs4), (_twin_utf8_to_ucs4), (twin_path_utf8):
	Add outline and stroke font support (pick one and remove the other)
	
	* twin_glyphs.c:
	Huge array of stroke fonts from Hershey.  Pick appropriate subset
	and remove extra glyphs (there are a lot here)
	
	* twin_path.c: (_twin_cur_subpath_len), (twin_path_cur_point),
	(twin_path_move), (twin_path_draw), (twin_path_close):
	Eliminate repeated move and close, eliminate duplicate draw.
	
	* twin_poly.c: (_twin_edge_build), (_span_fill), (_twin_edge_fill):
	Add support for 1, 4, 16 and 64 samples.  16 appears to be the
	magic sweet spot.
	
	* twin_ttf/Makefile.am:
	* twin_ttf/Vera.ttf:
	* twin_ttf/twin_ttf.c: (pos), (command), (cpos), (ucs4_to_utf8),
	(glyph), (outline_moveto), (outline_lineto), (outline_conicto),
	(outline_cubicto), (ucs_page), (ucs_first_in_page), (sanitize),
	(facename), (convert_font), (main):
	Convert "real" outline fonts to twin built-ins

	* twin_vera.c:
	Converted version of Bitstream Vera Sans Roman

	* twinint.h:
	* xtwin.c: (main):

2004-09-21  Keith Packard  <keithp@keithp.com>

	* twin.h:
	* twinint.h:
	Add a few definitions

	* twin_convolve.c: (_twin_path_leftpoint), (twin_path_convolve):
	Find pen starting point as closest to the normal to the path.
	Restructure convolve loop to be easier to understand
	
	* twin_path.c: (twin_path_circle):
	Round circle coordinates instead of truncating them
	
	* twin_poly.c: (_twin_fixed_grid_ceil), (_twin_edge_build),
	(_span_fill), (_twin_edge_fill):
	Move sample grid by 1/2 sample step.
	Clip polygons to mask pixmap.
	Modest performance improvement in span filling.
	Fix end case to remove edges before stepping.
	
	* xtwin.c: (main):
	Stroke a path.

2004-09-21  Keith Packard  <keithp@keithp.com>

	* Makefile.am:
	* twin.h:
	* twin_convolve.c: (_twin_path_leftmost), (_twin_path_step),
	(_clockwise), (twin_path_convolve):
	Add convolution.  Pen starting position needs work.
	
	* twin_geom.c: (_twin_distance_to_point_squared),
	(_twin_distance_to_line_squared):
	* twin_spline.c: (_twin_spline_error_squared), (twin_path_curve):
	* twinint.h:
	Move shared geometric functions to new file
	
	* twin_path.c: (_sin), (_cos), (twin_path_circle),
	(twin_path_fill):
	Add twin_path_circle to generate pens.
	Fix path edge generator to handle last subpath right.

	* twin_poly.c: (_twin_edge_build):
	Skip vertices which don't span a sample row
	
	* xtwin.c: (main):
	test convolutions

2004-09-20  Keith Packard  <keithp@keithp.com>

	* .cvsignore:
	Add .cvsignore file
	
	* architecture:
	Mention path primitives
	* Makefile.am:
	* twin.h:
	* twinint.h:
	Add paths
	
	* twin_draw.c: (twin_composite):
	Eliminate some unused variables.
	
	* twin_path.c: (twin_path_move), (twin_path_draw),
	(twin_path_close), (twin_path_fill), (twin_path_empty),
	(twin_path_create), (twin_path_destroy):
	Simple path construction
	
	* twin_poly.c: (_edge_compare_y), (_edge_step_by), (_dump_edge),
	(_twin_edge_build), (_span_fill), (_twin_edge_fill),
	(twin_polygon):
	Anti-aliased polygon fill code
	
	* twin_screen.c:
	Change twin_bool to twin_bool_t
	
	* twin_spline.c: (_lerp_half), (_de_casteljau),
	(_distance_squared_to_point), (_distance_squared_to_segment),
	(_twin_spline_error_squared), (_twin_spline_decompose),
	(twin_path_curve):
	Append cubic Bézier splines to paths

	* xtwin.c: (main):
	Test paths