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
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
|
/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkTextureCompressor.h"
#include "SkTextureCompressor_ASTC.h"
#include "SkTextureCompressor_LATC.h"
#include "SkTextureCompressor_R11EAC.h"
#include "SkBitmap.h"
#include "SkBitmapProcShader.h"
#include "SkData.h"
#include "SkEndian.h"
#include "SkTextureCompression_opts.h"
#ifndef SK_IGNORE_ETC1_SUPPORT
# include "etc1.h"
#endif
// Convert ETC1 functions to our function signatures
static bool compress_etc1_565(uint8_t* dst, const uint8_t* src,
int width, int height, size_t rowBytes) {
#ifndef SK_IGNORE_ETC1_SUPPORT
return 0 == etc1_encode_image(src, width, height, 2, SkToInt(rowBytes), dst);
#else
return false;
#endif
}
////////////////////////////////////////////////////////////////////////////////
namespace SkTextureCompressor {
void GetBlockDimensions(Format format, int* dimX, int* dimY, bool matchSpec) {
if (NULL == dimX || NULL == dimY) {
return;
}
if (!matchSpec && SkTextureCompressorGetPlatformDims(format, dimX, dimY)) {
return;
}
// No specialized arguments, return the dimensions as they are in the spec.
static const struct FormatDimensions {
const int fBlockSizeX;
const int fBlockSizeY;
} kFormatDimensions[kFormatCnt] = {
{ 4, 4 }, // kLATC_Format
{ 4, 4 }, // kR11_EAC_Format
{ 4, 4 }, // kETC1_Format
{ 4, 4 }, // kASTC_4x4_Format
{ 5, 4 }, // kASTC_5x4_Format
{ 5, 5 }, // kASTC_5x5_Format
{ 6, 5 }, // kASTC_6x5_Format
{ 6, 6 }, // kASTC_6x6_Format
{ 8, 5 }, // kASTC_8x5_Format
{ 8, 6 }, // kASTC_8x6_Format
{ 8, 8 }, // kASTC_8x8_Format
{ 10, 5 }, // kASTC_10x5_Format
{ 10, 6 }, // kASTC_10x6_Format
{ 10, 8 }, // kASTC_10x8_Format
{ 10, 10 }, // kASTC_10x10_Format
{ 12, 10 }, // kASTC_12x10_Format
{ 12, 12 }, // kASTC_12x12_Format
};
*dimX = kFormatDimensions[format].fBlockSizeX;
*dimY = kFormatDimensions[format].fBlockSizeY;
}
int GetCompressedDataSize(Format fmt, int width, int height) {
int dimX, dimY;
GetBlockDimensions(fmt, &dimX, &dimY, true);
int encodedBlockSize = 0;
switch (fmt) {
// These formats are 64 bits per 4x4 block.
case kLATC_Format:
case kR11_EAC_Format:
case kETC1_Format:
encodedBlockSize = 8;
break;
// This format is 128 bits.
case kASTC_4x4_Format:
case kASTC_5x4_Format:
case kASTC_5x5_Format:
case kASTC_6x5_Format:
case kASTC_6x6_Format:
case kASTC_8x5_Format:
case kASTC_8x6_Format:
case kASTC_8x8_Format:
case kASTC_10x5_Format:
case kASTC_10x6_Format:
case kASTC_10x8_Format:
case kASTC_10x10_Format:
case kASTC_12x10_Format:
case kASTC_12x12_Format:
encodedBlockSize = 16;
break;
default:
SkFAIL("Unknown compressed format!");
return -1;
}
if(((width % dimX) == 0) && ((height % dimY) == 0)) {
const int blocksX = width / dimX;
const int blocksY = height / dimY;
return blocksX * blocksY * encodedBlockSize;
}
return -1;
}
bool CompressBufferToFormat(uint8_t* dst, const uint8_t* src, SkColorType srcColorType,
int width, int height, size_t rowBytes, Format format, bool opt) {
CompressionProc proc = NULL;
if (opt) {
proc = SkTextureCompressorGetPlatformProc(srcColorType, format);
}
if (NULL == proc) {
switch (srcColorType) {
case kAlpha_8_SkColorType:
{
switch (format) {
case kLATC_Format:
proc = CompressA8ToLATC;
break;
case kR11_EAC_Format:
proc = CompressA8ToR11EAC;
break;
case kASTC_12x12_Format:
proc = CompressA8To12x12ASTC;
break;
default:
// Do nothing...
break;
}
}
break;
case kRGB_565_SkColorType:
{
switch (format) {
case kETC1_Format:
proc = compress_etc1_565;
break;
default:
// Do nothing...
break;
}
}
break;
default:
// Do nothing...
break;
}
}
if (proc) {
return proc(dst, src, width, height, rowBytes);
}
return false;
}
SkData* CompressBitmapToFormat(const SkBitmap &bitmap, Format format) {
SkAutoLockPixels alp(bitmap);
int compressedDataSize = GetCompressedDataSize(format, bitmap.width(), bitmap.height());
if (compressedDataSize < 0) {
return NULL;
}
const uint8_t* src = reinterpret_cast<const uint8_t*>(bitmap.getPixels());
SkData* dst = SkData::NewUninitialized(compressedDataSize);
if (!CompressBufferToFormat((uint8_t*)dst->writable_data(), src, bitmap.colorType(),
bitmap.width(), bitmap.height(), bitmap.rowBytes(), format)) {
dst->unref();
dst = NULL;
}
return dst;
}
SkBlitter* CreateBlitterForFormat(int width, int height, void* compressedBuffer,
SkTBlitterAllocator *allocator, Format format) {
switch(format) {
case kLATC_Format:
return CreateLATCBlitter(width, height, compressedBuffer, allocator);
case kR11_EAC_Format:
return CreateR11EACBlitter(width, height, compressedBuffer, allocator);
case kASTC_12x12_Format:
return CreateASTCBlitter(width, height, compressedBuffer, allocator);
default:
return NULL;
}
return NULL;
}
bool DecompressBufferFromFormat(uint8_t* dst, int dstRowBytes, const uint8_t* src,
int width, int height, Format format) {
int dimX, dimY;
GetBlockDimensions(format, &dimX, &dimY, true);
if (width < 0 || ((width % dimX) != 0) || height < 0 || ((height % dimY) != 0)) {
return false;
}
switch(format) {
case kLATC_Format:
DecompressLATC(dst, dstRowBytes, src, width, height);
return true;
case kR11_EAC_Format:
DecompressR11EAC(dst, dstRowBytes, src, width, height);
return true;
#ifndef SK_IGNORE_ETC1_SUPPORT
case kETC1_Format:
return 0 == etc1_decode_image(src, dst, width, height, 3, dstRowBytes);
#endif
case kASTC_4x4_Format:
case kASTC_5x4_Format:
case kASTC_5x5_Format:
case kASTC_6x5_Format:
case kASTC_6x6_Format:
case kASTC_8x5_Format:
case kASTC_8x6_Format:
case kASTC_8x8_Format:
case kASTC_10x5_Format:
case kASTC_10x6_Format:
case kASTC_10x8_Format:
case kASTC_10x10_Format:
case kASTC_12x10_Format:
case kASTC_12x12_Format:
DecompressASTC(dst, dstRowBytes, src, width, height, dimX, dimY);
return true;
default:
// Do nothing...
break;
}
return false;
}
} // namespace SkTextureCompressor
|
