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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/*************************************************************************/
/* image_etc.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "image_etc.h"
#include "Etc.h"
#include "EtcFilter.h"
#include "core/image.h"
#include "core/os/copymem.h"
#include "core/os/os.h"
#include "core/print_string.h"
static Image::Format _get_etc2_mode(Image::DetectChannels format) {
switch (format) {
case Image::DETECTED_R:
return Image::FORMAT_ETC2_R11;
case Image::DETECTED_RG:
return Image::FORMAT_ETC2_RG11;
case Image::DETECTED_RGB:
return Image::FORMAT_ETC2_RGB8;
case Image::DETECTED_RGBA:
return Image::FORMAT_ETC2_RGBA8;
// TODO: would be nice if we could use FORMAT_ETC2_RGB8A1 for FORMAT_RGBA5551
default:
// TODO: Kept for compatibility, but should be investigated whether it's correct or if it should error out
return Image::FORMAT_ETC2_RGBA8;
}
}
static Etc::Image::Format _image_format_to_etc2comp_format(Image::Format format) {
switch (format) {
case Image::FORMAT_ETC:
return Etc::Image::Format::ETC1;
case Image::FORMAT_ETC2_R11:
return Etc::Image::Format::R11;
case Image::FORMAT_ETC2_R11S:
return Etc::Image::Format::SIGNED_R11;
case Image::FORMAT_ETC2_RG11:
return Etc::Image::Format::RG11;
case Image::FORMAT_ETC2_RG11S:
return Etc::Image::Format::SIGNED_RG11;
case Image::FORMAT_ETC2_RGB8:
return Etc::Image::Format::RGB8;
case Image::FORMAT_ETC2_RGBA8:
return Etc::Image::Format::RGBA8;
case Image::FORMAT_ETC2_RGB8A1:
return Etc::Image::Format::RGB8A1;
default:
ERR_FAIL_V(Etc::Image::Format::UNKNOWN);
}
}
static void _compress_etc(Image *p_img, float p_lossy_quality, bool force_etc1_format, Image::CompressSource p_source) {
Image::Format img_format = p_img->get_format();
Image::DetectChannels detected_channels = p_img->get_detected_channels();
if (p_source == Image::COMPRESS_SOURCE_LAYERED) {
//keep what comes in
switch (p_img->get_format()) {
case Image::FORMAT_L8: {
detected_channels = Image::DETECTED_L;
} break;
case Image::FORMAT_LA8: {
detected_channels = Image::DETECTED_LA;
} break;
case Image::FORMAT_R8: {
detected_channels = Image::DETECTED_R;
} break;
case Image::FORMAT_RG8: {
detected_channels = Image::DETECTED_RG;
} break;
case Image::FORMAT_RGB8: {
detected_channels = Image::DETECTED_RGB;
} break;
case Image::FORMAT_RGBA8:
case Image::FORMAT_RGBA4444:
case Image::FORMAT_RGBA5551: {
detected_channels = Image::DETECTED_RGBA;
} break;
default: {}
}
}
if (p_source == Image::COMPRESS_SOURCE_SRGB && (detected_channels == Image::DETECTED_R || detected_channels == Image::DETECTED_RG)) {
//R and RG do not support SRGB
detected_channels = Image::DETECTED_RGB;
}
if (p_source == Image::COMPRESS_SOURCE_NORMAL) {
//use RG channels only for normal
detected_channels = Image::DETECTED_RG;
}
if (img_format >= Image::FORMAT_DXT1) {
return; //do not compress, already compressed
}
if (img_format > Image::FORMAT_RGBA8) {
// TODO: we should be able to handle FORMAT_RGBA4444 and FORMAT_RGBA5551 eventually
return;
}
uint32_t imgw = p_img->get_width(), imgh = p_img->get_height();
Image::Format etc_format = force_etc1_format ? Image::FORMAT_ETC : _get_etc2_mode(detected_channels);
Ref<Image> img = p_img->duplicate();
if (img->get_format() != Image::FORMAT_RGBA8)
img->convert(Image::FORMAT_RGBA8); //still uses RGBA to convert
if (img->has_mipmaps()) {
if (next_power_of_2(imgw) != imgw || next_power_of_2(imgh) != imgh) {
img->resize_to_po2();
imgw = img->get_width();
imgh = img->get_height();
}
} else {
if (imgw % 4 != 0 || imgh % 4 != 0) {
if (imgw % 4) {
imgw += 4 - imgw % 4;
}
if (imgh % 4) {
imgh += 4 - imgh % 4;
}
img->resize(imgw, imgh);
}
}
PoolVector<uint8_t>::Read r = img->get_data().read();
unsigned int target_size = Image::get_image_data_size(imgw, imgh, etc_format, p_img->has_mipmaps());
int mmc = 1 + (p_img->has_mipmaps() ? Image::get_image_required_mipmaps(imgw, imgh, etc_format) : 0);
PoolVector<uint8_t> dst_data;
dst_data.resize(target_size);
PoolVector<uint8_t>::Write w = dst_data.write();
// prepare parameters to be passed to etc2comp
int num_cpus = OS::get_singleton()->get_processor_count();
int encoding_time = 0;
float effort = 0.0; //default, reasonable time
if (p_lossy_quality > 0.75)
effort = 0.4;
else if (p_lossy_quality > 0.85)
effort = 0.6;
else if (p_lossy_quality > 0.95)
effort = 0.8;
Etc::ErrorMetric error_metric = Etc::ErrorMetric::RGBX; // NOTE: we can experiment with other error metrics
Etc::Image::Format etc2comp_etc_format = _image_format_to_etc2comp_format(etc_format);
int wofs = 0;
print_verbose("ETC: Begin encoding, format: " + Image::get_format_name(etc_format));
uint64_t t = OS::get_singleton()->get_ticks_msec();
for (int i = 0; i < mmc; i++) {
// convert source image to internal etc2comp format (which is equivalent to Image::FORMAT_RGBAF)
// NOTE: We can alternatively add a case to Image::convert to handle Image::FORMAT_RGBAF conversion.
int mipmap_ofs = 0, mipmap_size = 0, mipmap_w = 0, mipmap_h = 0;
img->get_mipmap_offset_size_and_dimensions(i, mipmap_ofs, mipmap_size, mipmap_w, mipmap_h);
const uint8_t *src = &r[mipmap_ofs];
Etc::ColorFloatRGBA *src_rgba_f = new Etc::ColorFloatRGBA[mipmap_w * mipmap_h];
for (int j = 0; j < mipmap_w * mipmap_h; j++) {
int si = j * 4; // RGBA8
src_rgba_f[j] = Etc::ColorFloatRGBA::ConvertFromRGBA8(src[si], src[si + 1], src[si + 2], src[si + 3]);
}
unsigned char *etc_data = NULL;
unsigned int etc_data_len = 0;
unsigned int extended_width = 0, extended_height = 0;
Etc::Encode((float *)src_rgba_f, mipmap_w, mipmap_h, etc2comp_etc_format, error_metric, effort, num_cpus, num_cpus, &etc_data, &etc_data_len, &extended_width, &extended_height, &encoding_time);
CRASH_COND(wofs + etc_data_len > target_size);
memcpy(&w[wofs], etc_data, etc_data_len);
wofs += etc_data_len;
delete[] etc_data;
delete[] src_rgba_f;
}
print_verbose("ETC: Time encoding: " + rtos(OS::get_singleton()->get_ticks_msec() - t));
p_img->create(imgw, imgh, p_img->has_mipmaps(), etc_format, dst_data);
}
static void _compress_etc1(Image *p_img, float p_lossy_quality) {
_compress_etc(p_img, p_lossy_quality, true, Image::COMPRESS_SOURCE_GENERIC);
}
static void _compress_etc2(Image *p_img, float p_lossy_quality, Image::CompressSource p_source) {
_compress_etc(p_img, p_lossy_quality, false, p_source);
}
void _register_etc_compress_func() {
Image::_image_compress_etc1_func = _compress_etc1;
Image::_image_compress_etc2_func = _compress_etc2;
}
|