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
|
/*
* Image output functions
*
* Copyright (C) 2019 Patrick McDermott
*
* This file is part of fbcon2png.
*
* fbcon2png is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* fbcon2png 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with fbcon2png. If not, see <http://www.gnu.org/licenses/>.
*/
#include "image.h"
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <png.h>
#include "font.h"
#include "i18n.h"
#include "output.h"
#include "text.h"
struct image {
FILE *fp;
png_structp png_ptr;
png_infop info_ptr;
};
struct image *
image_new(const char *file_name)
{
struct image *image;
assert(file_name && *file_name);
image = calloc(1, sizeof(*image));
if (!image) {
error(_("Cannot allocate memory for image object"));
return NULL;
}
if (strcmp(file_name, "-") != 0) {
image->fp = fopen(file_name, "wb");
if (!image->fp) {
error(_("Cannot open \"%s\" for writing"), file_name);
return image_destroy(&image);
}
}
image->png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
if (!image->png_ptr) {
error(_("Failed to create PNG structure"));
return image_destroy(&image);
}
image->info_ptr = png_create_info_struct(image->png_ptr);
if (!image->info_ptr) {
error(_("Failed to create PNG info structure"));
return image_destroy(&image);
}
if (image->fp) {
png_init_io(image->png_ptr, image->fp);
} else {
png_init_io(image->png_ptr, stdout);
}
return image;
}
void
image_render(struct image *image, const struct text *text,
const struct font *font)
{
size_t width;
size_t height;
png_byte **rows;
size_t i;
assert(image);
assert(text);
assert(font);
width = text_get_width(text) * font_get_width(font);
height = text_get_height(text) * font_get_height(font);
png_set_IHDR(image->png_ptr, image->info_ptr, width, height,
IMAGE_BIT_DEPTH, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
rows = png_malloc(image->png_ptr, height * sizeof(*rows));
for (i = 0; i < height; ++i) {
rows[i] = png_malloc(image->png_ptr, width * IMAGE_PIXEL_SIZE);
}
png_set_rows(image->png_ptr, image->info_ptr, rows);
text_render(text, font, rows);
png_write_png(image->png_ptr, image->info_ptr, PNG_TRANSFORM_IDENTITY,
NULL);
for (i = 0; i < height; ++i) {
png_free(image->png_ptr, rows[i]);
}
png_free(image->png_ptr, rows);
}
struct image *
image_destroy(struct image **image_p)
{
struct image *image;
assert(image_p && *image_p);
image = *image_p;
if (image->fp) {
fclose(image->fp);
}
png_destroy_write_struct(&image->png_ptr, &image->info_ptr);
free(image);
return image = NULL;
}
|
