1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
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
|
