forked from webmproject/libwebp
-
Notifications
You must be signed in to change notification settings - Fork 0
/
extras.c
162 lines (149 loc) · 4.82 KB
/
extras.c
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
// Copyright 2015 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// Additional WebP utilities.
//
#include "extras/extras.h"
#include "webp/format_constants.h"
#include "src/dsp/dsp.h"
#include <assert.h>
#include <string.h>
#define XTRA_MAJ_VERSION 1
#define XTRA_MIN_VERSION 1
#define XTRA_REV_VERSION 0
//------------------------------------------------------------------------------
int WebPGetExtrasVersion(void) {
return (XTRA_MAJ_VERSION << 16) | (XTRA_MIN_VERSION << 8) | XTRA_REV_VERSION;
}
//------------------------------------------------------------------------------
int WebPImportGray(const uint8_t* gray_data, WebPPicture* pic) {
int y, width, uv_width;
if (pic == NULL || gray_data == NULL) return 0;
pic->colorspace = WEBP_YUV420;
if (!WebPPictureAlloc(pic)) return 0;
width = pic->width;
uv_width = (width + 1) >> 1;
for (y = 0; y < pic->height; ++y) {
memcpy(pic->y + y * pic->y_stride, gray_data, width);
gray_data += width; // <- we could use some 'data_stride' here if needed
if ((y & 1) == 0) {
memset(pic->u + (y >> 1) * pic->uv_stride, 128, uv_width);
memset(pic->v + (y >> 1) * pic->uv_stride, 128, uv_width);
}
}
return 1;
}
int WebPImportRGB565(const uint8_t* rgb565, WebPPicture* pic) {
int x, y;
uint32_t* dst;
if (pic == NULL || rgb565 == NULL) return 0;
pic->colorspace = WEBP_YUV420;
pic->use_argb = 1;
if (!WebPPictureAlloc(pic)) return 0;
dst = pic->argb;
for (y = 0; y < pic->height; ++y) {
const int width = pic->width;
for (x = 0; x < width; ++x) {
#if defined(WEBP_SWAP_16BIT_CSP) && (WEBP_SWAP_16BIT_CSP == 1)
const uint32_t rg = rgb565[2 * x + 1];
const uint32_t gb = rgb565[2 * x + 0];
#else
const uint32_t rg = rgb565[2 * x + 0];
const uint32_t gb = rgb565[2 * x + 1];
#endif
uint32_t r = rg & 0xf8;
uint32_t g = ((rg << 5) | (gb >> 3)) & 0xfc;
uint32_t b = (gb << 5);
// dithering
r = r | (r >> 5);
g = g | (g >> 6);
b = b | (b >> 5);
dst[x] = (0xffu << 24) | (r << 16) | (g << 8) | b;
}
rgb565 += 2 * width;
dst += pic->argb_stride;
}
return 1;
}
int WebPImportRGB4444(const uint8_t* rgb4444, WebPPicture* pic) {
int x, y;
uint32_t* dst;
if (pic == NULL || rgb4444 == NULL) return 0;
pic->colorspace = WEBP_YUV420;
pic->use_argb = 1;
if (!WebPPictureAlloc(pic)) return 0;
dst = pic->argb;
for (y = 0; y < pic->height; ++y) {
const int width = pic->width;
for (x = 0; x < width; ++x) {
#if defined(WEBP_SWAP_16BIT_CSP) && (WEBP_SWAP_16BIT_CSP == 1)
const uint32_t rg = rgb4444[2 * x + 1];
const uint32_t ba = rgb4444[2 * x + 0];
#else
const uint32_t rg = rgb4444[2 * x + 0];
const uint32_t ba = rgb4444[2 * x + 1];
#endif
uint32_t r = rg & 0xf0;
uint32_t g = (rg << 4);
uint32_t b = (ba & 0xf0);
uint32_t a = (ba << 4);
// dithering
r = r | (r >> 4);
g = g | (g >> 4);
b = b | (b >> 4);
a = a | (a >> 4);
dst[x] = (a << 24) | (r << 16) | (g << 8) | b;
}
rgb4444 += 2 * width;
dst += pic->argb_stride;
}
return 1;
}
int WebPImportColorMappedARGB(const uint8_t* indexed, int indexed_stride,
const uint32_t palette[], int palette_size,
WebPPicture* pic) {
int x, y;
uint32_t* dst;
// 256 as the input buffer is uint8_t.
assert(MAX_PALETTE_SIZE <= 256);
if (pic == NULL || indexed == NULL || indexed_stride < pic->width ||
palette == NULL || palette_size > MAX_PALETTE_SIZE || palette_size <= 0) {
return 0;
}
pic->use_argb = 1;
if (!WebPPictureAlloc(pic)) return 0;
dst = pic->argb;
for (y = 0; y < pic->height; ++y) {
for (x = 0; x < pic->width; ++x) {
// Make sure we are within the palette.
if (indexed[x] >= palette_size) {
WebPPictureFree(pic);
return 0;
}
dst[x] = palette[indexed[x]];
}
indexed += indexed_stride;
dst += pic->argb_stride;
}
return 1;
}
//------------------------------------------------------------------------------
int WebPUnmultiplyARGB(WebPPicture* pic) {
int y;
uint32_t* dst;
if (pic == NULL || pic->use_argb != 1 || pic->argb == NULL) return 0;
WebPInitAlphaProcessing();
dst = pic->argb;
for (y = 0; y < pic->height; ++y) {
WebPMultARGBRow(dst, pic->width, /*inverse=*/1);
dst += pic->argb_stride;
}
return 1;
}
//------------------------------------------------------------------------------