/src/ghostpdl/base/gsclipsr.c
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1 | | /* Copyright (C) 2001-2023 Artifex Software, Inc. |
2 | | All Rights Reserved. |
3 | | |
4 | | This software is provided AS-IS with no warranty, either express or |
5 | | implied. |
6 | | |
7 | | This software is distributed under license and may not be copied, |
8 | | modified or distributed except as expressly authorized under the terms |
9 | | of the license contained in the file LICENSE in this distribution. |
10 | | |
11 | | Refer to licensing information at http://www.artifex.com or contact |
12 | | Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco, |
13 | | CA 94129, USA, for further information. |
14 | | */ |
15 | | |
16 | | |
17 | | /* clipsave/cliprestore */ |
18 | | #include "gx.h" |
19 | | #include "gserrors.h" |
20 | | #include "gsclipsr.h" |
21 | | #include "gsstruct.h" |
22 | | #include "gxclipsr.h" |
23 | | #include "gxfixed.h" /* for gxpath.h */ |
24 | | #include "gxpath.h" |
25 | | #include "gzstate.h" |
26 | | |
27 | | /* Structure descriptors */ |
28 | | private_st_clip_stack(); |
29 | | |
30 | | /* |
31 | | * When we free a clip stack entry and the associated clip path. |
32 | | */ |
33 | | static void |
34 | | rc_free_clip_stack(gs_memory_t * mem, void *vstack, client_name_t cname) |
35 | 1 | { |
36 | 1 | gx_clip_stack_t *stack = (gx_clip_stack_t *)vstack; |
37 | | |
38 | 1 | if (stack->rc.ref_count <= 1 ) { |
39 | 1 | gx_clip_path *pcpath = stack->clip_path; |
40 | | |
41 | 1 | gs_free_object(stack->rc.memory, stack, cname); |
42 | 1 | gx_cpath_free(pcpath, "rc_free_clip_stack"); |
43 | 1 | } |
44 | 1 | } |
45 | | |
46 | | /* clipsave */ |
47 | | int |
48 | | gs_clipsave(gs_gstate *pgs) |
49 | 1 | { |
50 | 1 | gs_memory_t *mem = pgs->memory; |
51 | 1 | gx_clip_path *copy = |
52 | 1 | gx_cpath_alloc_shared(pgs->clip_path, mem, "gs_clipsave(clip_path)"); |
53 | 1 | gx_clip_stack_t *stack = |
54 | 1 | gs_alloc_struct(mem, gx_clip_stack_t, &st_clip_stack, |
55 | 1 | "gs_clipsave(stack)"); |
56 | | |
57 | 1 | if (copy == 0 || stack == 0) { |
58 | 0 | gs_free_object(mem, stack, "gs_clipsave(stack)"); |
59 | 0 | gs_free_object(mem, copy, "gs_clipsave(clip_path)"); |
60 | 0 | return_error(gs_error_VMerror); |
61 | 0 | } |
62 | 1 | rc_init_free(stack, mem, 1, rc_free_clip_stack); |
63 | 1 | stack->clip_path = copy; |
64 | 1 | stack->next = pgs->clip_stack; |
65 | 1 | pgs->clip_stack = stack; |
66 | 1 | return 0; |
67 | 1 | } |
68 | | |
69 | | /* cliprestore */ |
70 | | int |
71 | | gs_cliprestore(gs_gstate *pgs) |
72 | 3 | { |
73 | 3 | gx_clip_stack_t *stack = pgs->clip_stack; |
74 | | |
75 | 3 | if (stack) { |
76 | 0 | gx_clip_stack_t *next = stack->next; |
77 | 0 | gx_clip_path *pcpath = stack->clip_path; |
78 | 0 | int code; |
79 | |
|
80 | 0 | if (stack->rc.ref_count == 1) { |
81 | | /* Use assign_free rather than assign_preserve. */ |
82 | 0 | gs_free_object(stack->rc.memory, stack, "cliprestore"); |
83 | 0 | code = gx_cpath_assign_free(pgs->clip_path, pcpath); |
84 | 0 | } else { |
85 | 0 | code = gx_cpath_assign_preserve(pgs->clip_path, pcpath); |
86 | 0 | if (code < 0) |
87 | 0 | return code; |
88 | 0 | --(stack->rc.ref_count); |
89 | 0 | } |
90 | 0 | pgs->clip_stack = next; |
91 | 0 | return code; |
92 | 3 | } else { |
93 | 3 | return gx_cpath_assign_preserve(pgs->clip_path, pgs->saved->clip_path); |
94 | 3 | } |
95 | 3 | } |