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
|
#include "jxl.h"
#include <stdlib.h>
#include <stdio.h>
#include <jxl/decode.h>
#include <jxl/codestream_header.h>
#if defined(WBG_HAVE_JXL_THREADS)
#include <jxl/resizable_parallel_runner.h>
#endif
#define LOG_MODULE "jxl"
#define LOG_ENABLE_DBG 0
#include "log.h"
#include "stride.h"
pixman_image_t *
jxl_load(FILE *fp, const char *path)
{
pixman_image_t *pix = NULL;
pixman_format_code_t format = PIXMAN_x8b8g8r8;
bool ok = false;
uint8_t *file_data = NULL;
uint8_t *image = NULL;
size_t file_size, image_size = 0;
int width = 0, height = 0, stride = 0;
#if defined(WBG_HAVE_JXL_THREADS)
JxlParallelRunner *runner = NULL;
#endif
JxlDecoder *decoder = NULL;
JxlBasicInfo info = {0};
JxlPixelFormat jxl_format = {
.num_channels = 4,
.data_type = JXL_TYPE_UINT8,
.endianness = JXL_LITTLE_ENDIAN,
.align = 0
};
if (fseek(fp, 0, SEEK_END) < 0) {
LOG_ERRNO("%s: failed to seek to end of file", path);
return NULL;
}
file_size = ftell(fp);
if (fseek(fp, 0, SEEK_SET) < 0) {
LOG_ERRNO("%s: failed to seek to beginning of file", path);
return NULL;
}
if (!(file_data = malloc(file_size)))
goto err;
clearerr(fp);
if (fread(file_data, sizeof(*file_data), file_size, fp) != file_size
&& ferror(fp)) {
LOG_ERRNO("%s: failed to read", path);
goto err;
}
if (JxlSignatureCheck(file_data, file_size) == JXL_SIG_INVALID) {
LOG_DBG("%s: not a jpegxl image", path);
goto err;
}
if (!(decoder = JxlDecoderCreate(NULL)))
goto err;
#if defined(WBG_HAVE_JXL_THREADS)
if (!(runner = JxlResizableParallelRunnerCreate(NULL)))
goto err;
JxlDecoderSetParallelRunner(decoder, JxlResizableParallelRunner, runner);
#endif
JxlDecoderSubscribeEvents(decoder, JXL_DEC_BASIC_INFO | JXL_DEC_FULL_IMAGE);
JxlDecoderSetInput(decoder, file_data, file_size);
JxlDecoderCloseInput(decoder);
while (1) {
JxlDecoderStatus status = JxlDecoderProcessInput(decoder);
if (status == JXL_DEC_ERROR) {
LOG_ERR("%s: decoder error", path);
goto err;
} else if (status == JXL_DEC_NEED_MORE_INPUT) {
LOG_ERR("%s: decoder requires more input but already provided all input", path);
goto err;
} else if (status == JXL_DEC_BASIC_INFO) {
if (JxlDecoderGetBasicInfo(decoder, &info)
!= JXL_DEC_SUCCESS) {
LOG_ERR("%s: failed to get basic info", path);
}
width = info.xsize;
height = info.ysize;
stride = stride_for_format_and_width(format, width);
image_size = height * stride;
LOG_DBG("%s: %dx%d@%hhubpp, %d channels, %d alpha bits", path, width, height,
info.bits_per_sample, info.num_color_channels, info.alpha_bits);
if (!(image = malloc(image_size)))
goto err;
#if defined(WBG_HAVE_JXL_THREADS)
JxlResizableParallelRunnerSetThreads(runner,
JxlResizableParallelRunnerSuggestThreads(width, height));
#endif
} else if (status == JXL_DEC_NEED_IMAGE_OUT_BUFFER) {
size_t min_size = 0;
if (JxlDecoderImageOutBufferSize(decoder, &jxl_format, &min_size)
!= JXL_DEC_SUCCESS) {
LOG_ERR("%s: failed to get the minimum size of the output buffer", path);
goto err;
}
if (min_size > image_size) {
LOG_ERR("minimum size [%zu] is greater than the expected size [%zu]",
min_size, image_size);
goto err;
} else if (min_size < image_size) {
LOG_WARN("minimum size [%zu] is less than the expected size [%zu]",
min_size, image_size);
}
if (JxlDecoderSetImageOutBuffer(decoder, &jxl_format, image,
image_size) != JXL_DEC_SUCCESS) {
LOG_ERR("%s: failed to set output buffer", path);
goto err;
}
} else {
break;
}
}
for (uint32_t *abgr = (uint32_t *)image;
abgr < (uint32_t *)(image + (size_t)width * (size_t)height * 4);
abgr++) {
uint8_t alpha = (*abgr >> 24) & 0xff;
uint8_t red = (*abgr >> 16) & 0xff;
uint8_t green = (*abgr >> 8) & 0xff;
uint8_t blue = (*abgr >> 0) & 0xff;
if (alpha == 0xff)
continue;
if (alpha == 0x00)
blue = green = red = 0x00;
else {
blue = blue * alpha / 0xff;
green = green * alpha / 0xff;
red = red * alpha / 0xff;
}
*abgr = (uint32_t)alpha << 24 | red << 16 | green << 8 | blue;
}
pix = pixman_image_create_bits_no_clear(format, width, height,
(uint32_t *)image, stride);
ok = pix != NULL;
err:
if (!ok)
free(image);
free(file_data);
#if defined(WBG_HAVE_JXL_THREADS)
JxlResizableParallelRunnerDestroy(runner);
#endif
JxlDecoderDestroy(decoder);
return pix;
}
|
