Rev 1892 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
1892 | serge | 1 | /* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */ |
2 | /* cairo - a vector graphics library with display and print output |
||
3 | * |
||
4 | * Copyright (c) 2008 M Joonas Pihlaja |
||
5 | * |
||
6 | * Permission is hereby granted, free of charge, to any person |
||
7 | * obtaining a copy of this software and associated documentation |
||
8 | * files (the "Software"), to deal in the Software without |
||
9 | * restriction, including without limitation the rights to use, |
||
10 | * copy, modify, merge, publish, distribute, sublicense, and/or sell |
||
11 | * copies of the Software, and to permit persons to whom the |
||
12 | * Software is furnished to do so, subject to the following |
||
13 | * conditions: |
||
14 | * |
||
15 | * The above copyright notice and this permission notice shall be |
||
16 | * included in all copies or substantial portions of the Software. |
||
17 | * |
||
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
||
19 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES |
||
20 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
||
21 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT |
||
22 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
||
23 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
||
24 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
||
25 | * OTHER DEALINGS IN THE SOFTWARE. |
||
26 | */ |
||
27 | #ifndef CAIRO_SPANS_PRIVATE_H |
||
28 | #define CAIRO_SPANS_PRIVATE_H |
||
29 | #include "cairo-types-private.h" |
||
30 | #include "cairo-compiler-private.h" |
||
31 | |||
32 | /* Number of bits of precision used for alpha. */ |
||
33 | #define CAIRO_SPANS_UNIT_COVERAGE_BITS 8 |
||
34 | #define CAIRO_SPANS_UNIT_COVERAGE ((1 << CAIRO_SPANS_UNIT_COVERAGE_BITS)-1) |
||
35 | |||
36 | /* A structure representing an open-ended horizontal span of constant |
||
37 | * pixel coverage. */ |
||
38 | typedef struct _cairo_half_open_span { |
||
3959 | Serge | 39 | int32_t x; /* The inclusive x-coordinate of the start of the span. */ |
40 | uint8_t coverage; /* The pixel coverage for the pixels to the right. */ |
||
41 | uint8_t inverse; /* between regular mask and clip */ |
||
1892 | serge | 42 | } cairo_half_open_span_t; |
43 | |||
44 | /* Span renderer interface. Instances of renderers are provided by |
||
45 | * surfaces if they want to composite spans instead of trapezoids. */ |
||
46 | typedef struct _cairo_span_renderer cairo_span_renderer_t; |
||
47 | struct _cairo_span_renderer { |
||
48 | /* Private status variable. */ |
||
49 | cairo_status_t status; |
||
50 | |||
51 | /* Called to destroy the renderer. */ |
||
52 | cairo_destroy_func_t destroy; |
||
53 | |||
54 | /* Render the spans on row y of the destination by whatever compositing |
||
55 | * method is required. */ |
||
56 | cairo_warn cairo_status_t |
||
57 | (*render_rows) (void *abstract_renderer, |
||
58 | int y, int height, |
||
59 | const cairo_half_open_span_t *coverages, |
||
60 | unsigned num_coverages); |
||
61 | |||
62 | /* Called after all rows have been rendered to perform whatever |
||
63 | * final rendering step is required. This function is called just |
||
64 | * once before the renderer is destroyed. */ |
||
65 | cairo_status_t (*finish) (void *abstract_renderer); |
||
66 | }; |
||
67 | |||
68 | /* Scan converter interface. */ |
||
69 | typedef struct _cairo_scan_converter cairo_scan_converter_t; |
||
70 | struct _cairo_scan_converter { |
||
71 | /* Destroy this scan converter. */ |
||
72 | cairo_destroy_func_t destroy; |
||
73 | |||
74 | /* Generates coverage spans for rows for the added edges and calls |
||
75 | * the renderer function for each row. After generating spans the |
||
76 | * only valid thing to do with the converter is to destroy it. */ |
||
77 | cairo_status_t (*generate) (void *abstract_converter, |
||
78 | cairo_span_renderer_t *renderer); |
||
79 | |||
80 | /* Private status. Read with _cairo_scan_converter_status(). */ |
||
81 | cairo_status_t status; |
||
82 | }; |
||
83 | |||
84 | /* Scan converter constructors. */ |
||
85 | |||
86 | cairo_private cairo_scan_converter_t * |
||
87 | _cairo_tor_scan_converter_create (int xmin, |
||
88 | int ymin, |
||
89 | int xmax, |
||
90 | int ymax, |
||
3959 | Serge | 91 | cairo_fill_rule_t fill_rule, |
92 | cairo_antialias_t antialias); |
||
93 | cairo_private cairo_status_t |
||
94 | _cairo_tor_scan_converter_add_polygon (void *converter, |
||
95 | const cairo_polygon_t *polygon); |
||
1892 | serge | 96 | |
3959 | Serge | 97 | cairo_private cairo_scan_converter_t * |
98 | _cairo_tor22_scan_converter_create (int xmin, |
||
99 | int ymin, |
||
100 | int xmax, |
||
101 | int ymax, |
||
102 | cairo_fill_rule_t fill_rule, |
||
103 | cairo_antialias_t antialias); |
||
104 | cairo_private cairo_status_t |
||
105 | _cairo_tor22_scan_converter_add_polygon (void *converter, |
||
106 | const cairo_polygon_t *polygon); |
||
107 | |||
108 | cairo_private cairo_scan_converter_t * |
||
109 | _cairo_mono_scan_converter_create (int xmin, |
||
110 | int ymin, |
||
111 | int xmax, |
||
112 | int ymax, |
||
113 | cairo_fill_rule_t fill_rule); |
||
114 | cairo_private cairo_status_t |
||
115 | _cairo_mono_scan_converter_add_polygon (void *converter, |
||
116 | const cairo_polygon_t *polygon); |
||
117 | |||
118 | cairo_private cairo_scan_converter_t * |
||
119 | _cairo_clip_tor_scan_converter_create (cairo_clip_t *clip, |
||
120 | cairo_polygon_t *polygon, |
||
121 | cairo_fill_rule_t fill_rule, |
||
122 | cairo_antialias_t antialias); |
||
123 | |||
1892 | serge | 124 | typedef struct _cairo_rectangular_scan_converter { |
125 | cairo_scan_converter_t base; |
||
126 | |||
3959 | Serge | 127 | cairo_box_t extents; |
1892 | serge | 128 | |
129 | struct _cairo_rectangular_scan_converter_chunk { |
||
130 | struct _cairo_rectangular_scan_converter_chunk *next; |
||
131 | void *base; |
||
132 | int count; |
||
133 | int size; |
||
134 | } chunks, *tail; |
||
135 | char buf[CAIRO_STACK_BUFFER_SIZE]; |
||
136 | int num_rectangles; |
||
137 | } cairo_rectangular_scan_converter_t; |
||
138 | |||
139 | cairo_private void |
||
140 | _cairo_rectangular_scan_converter_init (cairo_rectangular_scan_converter_t *self, |
||
141 | const cairo_rectangle_int_t *extents); |
||
142 | |||
143 | cairo_private cairo_status_t |
||
144 | _cairo_rectangular_scan_converter_add_box (cairo_rectangular_scan_converter_t *self, |
||
145 | const cairo_box_t *box, |
||
146 | int dir); |
||
147 | |||
148 | typedef struct _cairo_botor_scan_converter { |
||
149 | cairo_scan_converter_t base; |
||
150 | |||
151 | cairo_box_t extents; |
||
152 | cairo_fill_rule_t fill_rule; |
||
153 | |||
154 | int xmin, xmax; |
||
155 | |||
156 | struct _cairo_botor_scan_converter_chunk { |
||
157 | struct _cairo_botor_scan_converter_chunk *next; |
||
158 | void *base; |
||
159 | int count; |
||
160 | int size; |
||
161 | } chunks, *tail; |
||
162 | char buf[CAIRO_STACK_BUFFER_SIZE]; |
||
163 | int num_edges; |
||
164 | } cairo_botor_scan_converter_t; |
||
165 | |||
166 | cairo_private void |
||
167 | _cairo_botor_scan_converter_init (cairo_botor_scan_converter_t *self, |
||
168 | const cairo_box_t *extents, |
||
169 | cairo_fill_rule_t fill_rule); |
||
170 | |||
171 | /* cairo-spans.c: */ |
||
172 | |||
173 | cairo_private cairo_scan_converter_t * |
||
174 | _cairo_scan_converter_create_in_error (cairo_status_t error); |
||
175 | |||
176 | cairo_private cairo_status_t |
||
177 | _cairo_scan_converter_status (void *abstract_converter); |
||
178 | |||
179 | cairo_private cairo_status_t |
||
180 | _cairo_scan_converter_set_error (void *abstract_converter, |
||
181 | cairo_status_t error); |
||
182 | |||
183 | cairo_private cairo_span_renderer_t * |
||
184 | _cairo_span_renderer_create_in_error (cairo_status_t error); |
||
185 | |||
186 | cairo_private cairo_status_t |
||
187 | _cairo_span_renderer_status (void *abstract_renderer); |
||
188 | |||
189 | /* Set the renderer into an error state. This sets all the method |
||
190 | * pointers except ->destroy() of the renderer to no-op |
||
191 | * implementations that just return the error status. */ |
||
192 | cairo_private cairo_status_t |
||
193 | _cairo_span_renderer_set_error (void *abstract_renderer, |
||
194 | cairo_status_t error); |
||
195 | |||
196 | cairo_private cairo_status_t |
||
197 | _cairo_surface_composite_polygon (cairo_surface_t *surface, |
||
198 | cairo_operator_t op, |
||
199 | const cairo_pattern_t *pattern, |
||
200 | cairo_fill_rule_t fill_rule, |
||
201 | cairo_antialias_t antialias, |
||
202 | const cairo_composite_rectangles_t *rects, |
||
203 | cairo_polygon_t *polygon, |
||
204 | cairo_region_t *clip_region); |
||
205 | |||
206 | #endif /* CAIRO_SPANS_PRIVATE_H */><> |