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
|
// Copyright (C) 2024 Artifex Software, Inc.
//
// This file is part of MuPDF.
//
// MuPDF is free software: you can redistribute it and/or modify it under the
// terms of the GNU Affero General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License
// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
//
// Alternative licensing terms are available from the licensor.
// For commercial licensing, see <https://www.artifex.com/> or contact
// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
// CA 94129, USA, for further information.
#include "mupdf/pdf.h"
typedef struct {
fz_colorspace *outcs;
pdf_obj *outcs_obj;
} recolor_data;
static void
color_rewrite(fz_context *ctx, void *opaque, pdf_obj **cs_obj, int *n, float color[FZ_MAX_COLORS])
{
recolor_data *rd = (recolor_data *)opaque;
fz_colorspace *cs;
float cols[4] = { 0 };
if (pdf_name_eq(ctx, *cs_obj, PDF_NAME(Pattern)))
return;
if (pdf_name_eq(ctx, pdf_dict_get(ctx, *cs_obj, PDF_NAME(Type)), PDF_NAME(Pattern)))
return;
if (*n != 0)
{
cs = pdf_load_colorspace(ctx, *cs_obj);
fz_try(ctx)
{
fz_convert_color(ctx, cs, color, rd->outcs, cols, NULL, fz_default_color_params);
}
fz_always(ctx)
fz_drop_colorspace(ctx, cs);
fz_catch(ctx)
fz_rethrow(ctx);
*n = rd->outcs->n;
}
pdf_drop_obj(ctx, *cs_obj);
*cs_obj = rd->outcs_obj;
memcpy(color, cols, sizeof(color[0])*4);
}
static void
image_rewrite(fz_context *ctx, void *opaque, fz_image **image, fz_matrix ctm, pdf_obj *im_obj)
{
recolor_data *rd = (recolor_data *)opaque;
fz_image *orig = *image;
fz_pixmap *pix = NULL;
fz_colorspace* dst_cs;
fz_var(pix);
if ((*image)->imagemask)
return;
dst_cs = rd->outcs;
pix = fz_get_unscaled_pixmap_from_image(ctx, orig);
fz_try(ctx)
{
if (pix->colorspace != dst_cs)
{
fz_pixmap *pix2 = fz_convert_pixmap(ctx, pix, dst_cs, NULL, NULL, fz_default_color_params, 1);
fz_drop_pixmap(ctx, pix);
pix = pix2;
}
*image = fz_new_image_from_pixmap(ctx, pix, orig->mask);
fz_drop_image(ctx, orig);
}
fz_always(ctx)
fz_drop_pixmap(ctx, pix);
fz_catch(ctx)
fz_rethrow(ctx);
}
static void
vertex_rewrite(fz_context *ctx, void *opaque, fz_colorspace *dst_cs, float *d, fz_colorspace *src_cs, const float *s)
{
recolor_data *rd = (recolor_data *)opaque;
fz_convert_color(ctx, src_cs, s, rd->outcs, d, NULL, fz_default_color_params);
}
static pdf_recolor_vertex *
shade_rewrite(fz_context *ctx, void *opaque, fz_colorspace *src_cs, fz_colorspace **dst_cs)
{
recolor_data *rd = (recolor_data *)opaque;
*dst_cs = rd->outcs;
return vertex_rewrite;
}
static void
rewrite_page_streams(fz_context *ctx, pdf_document *doc, int page_num, recolor_data *rd)
{
pdf_page *page = pdf_load_page(ctx, doc, page_num);
pdf_filter_options options = { 0 };
pdf_filter_factory list[2] = { 0 };
pdf_color_filter_options copts = { 0 };
pdf_annot *annot;
copts.opaque = rd;
copts.color_rewrite = color_rewrite;
copts.image_rewrite = image_rewrite;
copts.shade_rewrite = shade_rewrite;
options.filters = list;
options.recurse = 1;
list[0].filter = pdf_new_color_filter;
list[0].options = &copts;
fz_try(ctx)
{
pdf_filter_page_contents(ctx, doc, page, &options);
for (annot = pdf_first_annot(ctx, page); annot != NULL; annot = pdf_next_annot(ctx, annot))
pdf_filter_annot_contents(ctx, doc, annot, &options);
}
fz_always(ctx)
fz_drop_page(ctx, &page->super);
fz_catch(ctx)
fz_rethrow(ctx);
}
void pdf_recolor_page(fz_context *ctx, pdf_document *doc, int pagenum, const pdf_recolor_options *opts)
{
recolor_data rd = { 0 };
if (opts == NULL)
fz_throw(ctx, FZ_ERROR_ARGUMENT, "Options must be supplied");
switch (opts->num_comp)
{
case 1:
rd.outcs = fz_device_gray(ctx);
rd.outcs_obj = PDF_NAME(DeviceGray);
break;
case 3:
rd.outcs = fz_device_rgb(ctx);
rd.outcs_obj = PDF_NAME(DeviceRGB);
break;
case 4:
rd.outcs = fz_device_cmyk(ctx);
rd.outcs_obj = PDF_NAME(DeviceCMYK);
break;
default:
fz_throw(ctx, FZ_ERROR_ARGUMENT, "Unsupported number of components");
}
rewrite_page_streams(ctx, doc, pagenum, &rd);
}
void pdf_remove_output_intents(fz_context *ctx, pdf_document *doc)
{
pdf_dict_del(ctx, pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME(Root)), PDF_NAME(OutputIntents));
}
|
