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
|
// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "lib/jxl/blending.h"
#include <cstddef>
#include <cstring>
#include <vector>
#include "lib/jxl/alpha.h"
#include "lib/jxl/base/status.h"
#include "lib/jxl/dec_patch_dictionary.h"
#include "lib/jxl/frame_header.h"
#include "lib/jxl/image.h"
#include "lib/jxl/image_metadata.h"
namespace jxl {
bool NeedsBlending(const FrameHeader& frame_header) {
if (!(frame_header.frame_type == FrameType::kRegularFrame ||
frame_header.frame_type == FrameType::kSkipProgressive)) {
return false;
}
const auto& info = frame_header.blending_info;
bool replace_all = (info.mode == BlendMode::kReplace);
for (const auto& ec_i : frame_header.extra_channel_blending_info) {
if (ec_i.mode != BlendMode::kReplace) {
replace_all = false;
}
}
// Replace the full frame: nothing to do.
if (!frame_header.custom_size_or_origin && replace_all) {
return false;
}
return true;
}
Status PerformBlending(
const float* const* bg, const float* const* fg, float* const* out,
size_t x0, size_t xsize, const PatchBlending& color_blending,
const PatchBlending* ec_blending,
const std::vector<ExtraChannelInfo>& extra_channel_info) {
bool has_alpha = false;
size_t num_ec = extra_channel_info.size();
for (size_t i = 0; i < num_ec; i++) {
if (extra_channel_info[i].type == jxl::ExtraChannel::kAlpha) {
has_alpha = true;
break;
}
}
JXL_ASSIGN_OR_RETURN(ImageF tmp, ImageF::Create(xsize, 3 + num_ec));
// Blend extra channels first so that we use the pre-blending alpha.
for (size_t i = 0; i < num_ec; i++) {
if (ec_blending[i].mode == PatchBlendMode::kAdd) {
for (size_t x = 0; x < xsize; x++) {
tmp.Row(3 + i)[x] = bg[3 + i][x + x0] + fg[3 + i][x + x0];
}
} else if (ec_blending[i].mode == PatchBlendMode::kBlendAbove) {
size_t alpha = ec_blending[i].alpha_channel;
bool is_premultiplied = extra_channel_info[alpha].alpha_associated;
PerformAlphaBlending(bg[3 + i] + x0, bg[3 + alpha] + x0, fg[3 + i] + x0,
fg[3 + alpha] + x0, tmp.Row(3 + i), xsize,
is_premultiplied, ec_blending[i].clamp);
} else if (ec_blending[i].mode == PatchBlendMode::kBlendBelow) {
size_t alpha = ec_blending[i].alpha_channel;
bool is_premultiplied = extra_channel_info[alpha].alpha_associated;
PerformAlphaBlending(fg[3 + i] + x0, fg[3 + alpha] + x0, bg[3 + i] + x0,
bg[3 + alpha] + x0, tmp.Row(3 + i), xsize,
is_premultiplied, ec_blending[i].clamp);
} else if (ec_blending[i].mode == PatchBlendMode::kAlphaWeightedAddAbove) {
size_t alpha = ec_blending[i].alpha_channel;
PerformAlphaWeightedAdd(bg[3 + i] + x0, fg[3 + i] + x0,
fg[3 + alpha] + x0, tmp.Row(3 + i), xsize,
ec_blending[i].clamp);
} else if (ec_blending[i].mode == PatchBlendMode::kAlphaWeightedAddBelow) {
size_t alpha = ec_blending[i].alpha_channel;
PerformAlphaWeightedAdd(fg[3 + i] + x0, bg[3 + i] + x0,
bg[3 + alpha] + x0, tmp.Row(3 + i), xsize,
ec_blending[i].clamp);
} else if (ec_blending[i].mode == PatchBlendMode::kMul) {
PerformMulBlending(bg[3 + i] + x0, fg[3 + i] + x0, tmp.Row(3 + i), xsize,
ec_blending[i].clamp);
} else if (ec_blending[i].mode == PatchBlendMode::kReplace) {
memcpy(tmp.Row(3 + i), fg[3 + i] + x0, xsize * sizeof(**fg));
} else if (ec_blending[i].mode == PatchBlendMode::kNone) {
if (xsize) memcpy(tmp.Row(3 + i), bg[3 + i] + x0, xsize * sizeof(**fg));
} else {
JXL_UNREACHABLE("new PatchBlendMode?");
}
}
size_t alpha = color_blending.alpha_channel;
if (color_blending.mode == PatchBlendMode::kAdd ||
(color_blending.mode == PatchBlendMode::kAlphaWeightedAddAbove &&
!has_alpha) ||
(color_blending.mode == PatchBlendMode::kAlphaWeightedAddBelow &&
!has_alpha)) {
for (int p = 0; p < 3; p++) {
float* out = tmp.Row(p);
for (size_t x = 0; x < xsize; x++) {
out[x] = bg[p][x + x0] + fg[p][x + x0];
}
}
} else if (color_blending.mode == PatchBlendMode::kBlendAbove
// blend without alpha is just replace
&& has_alpha) {
bool is_premultiplied = extra_channel_info[alpha].alpha_associated;
PerformAlphaBlending(
{bg[0] + x0, bg[1] + x0, bg[2] + x0, bg[3 + alpha] + x0},
{fg[0] + x0, fg[1] + x0, fg[2] + x0, fg[3 + alpha] + x0},
{tmp.Row(0), tmp.Row(1), tmp.Row(2), tmp.Row(3 + alpha)}, xsize,
is_premultiplied, color_blending.clamp);
} else if (color_blending.mode == PatchBlendMode::kBlendBelow
// blend without alpha is just replace
&& has_alpha) {
bool is_premultiplied = extra_channel_info[alpha].alpha_associated;
PerformAlphaBlending(
{fg[0] + x0, fg[1] + x0, fg[2] + x0, fg[3 + alpha] + x0},
{bg[0] + x0, bg[1] + x0, bg[2] + x0, bg[3 + alpha] + x0},
{tmp.Row(0), tmp.Row(1), tmp.Row(2), tmp.Row(3 + alpha)}, xsize,
is_premultiplied, color_blending.clamp);
} else if (color_blending.mode == PatchBlendMode::kAlphaWeightedAddAbove) {
JXL_DASSERT(has_alpha);
for (size_t c = 0; c < 3; c++) {
PerformAlphaWeightedAdd(bg[c] + x0, fg[c] + x0, fg[3 + alpha] + x0,
tmp.Row(c), xsize, color_blending.clamp);
}
} else if (color_blending.mode == PatchBlendMode::kAlphaWeightedAddBelow) {
JXL_DASSERT(has_alpha);
for (size_t c = 0; c < 3; c++) {
PerformAlphaWeightedAdd(fg[c] + x0, bg[c] + x0, bg[3 + alpha] + x0,
tmp.Row(c), xsize, color_blending.clamp);
}
} else if (color_blending.mode == PatchBlendMode::kMul) {
for (int p = 0; p < 3; p++) {
PerformMulBlending(bg[p] + x0, fg[p] + x0, tmp.Row(p), xsize,
color_blending.clamp);
}
} else if (color_blending.mode == PatchBlendMode::kReplace ||
color_blending.mode == PatchBlendMode::kBlendAbove ||
color_blending.mode == PatchBlendMode::kBlendBelow) { // kReplace
for (size_t p = 0; p < 3; p++) {
memcpy(tmp.Row(p), fg[p] + x0, xsize * sizeof(**fg));
}
} else if (color_blending.mode == PatchBlendMode::kNone) {
for (size_t p = 0; p < 3; p++) {
memcpy(tmp.Row(p), bg[p] + x0, xsize * sizeof(**fg));
}
} else {
JXL_UNREACHABLE("new PatchBlendMode?");
}
for (size_t i = 0; i < 3 + num_ec; i++) {
if (xsize != 0) memcpy(out[i] + x0, tmp.Row(i), xsize * sizeof(**out));
}
return true;
}
} // namespace jxl
|
