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
|
// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/image/image_util.h"
#include <stdint.h>
#include <algorithm>
#include <memory>
#include <optional>
#include "build/build_config.h"
#include "skia/ext/image_operations.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/codec/jpeg_codec.h"
#include "ui/gfx/codec/webp_codec.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_rep.h"
#include "ui/gfx/image/resize_image_dimensions.h"
namespace {
// Returns whether column |x| of |bitmap| has any "visible pixels", where
// "visible" is defined as having an opactiy greater than an arbitrary small
// value.
bool ColumnHasVisiblePixels(const SkBitmap& bitmap, int x) {
const SkAlpha kMinimumVisibleOpacity = 12;
for (int y = 0; y < bitmap.height(); ++y) {
if (SkColorGetA(bitmap.getColor(x, y)) > kMinimumVisibleOpacity)
return true;
}
return false;
}
} // namespace
namespace gfx {
// The iOS implementations of the JPEG functions are in image_util_ios.mm.
#if !BUILDFLAG(IS_IOS)
Image ImageFrom1xJPEGEncodedData(base::span<const uint8_t> input) {
SkBitmap bitmap = gfx::JPEGCodec::Decode(input);
if (!bitmap.isNull()) {
return Image::CreateFrom1xBitmap(bitmap);
}
return Image();
}
Image ResizedImageForSearchByImage(const Image& image) {
return ResizedImageForMaxDimensions(image, kSearchByImageMaxImageWidth,
kSearchByImageMaxImageHeight,
kSearchByImageMaxImageArea);
}
Image ResizedImageForMaxDimensions(const Image& image,
int max_width,
int max_height,
int max_area) {
const gfx::ImageSkiaRep& image_skia_rep =
image.AsImageSkia().GetRepresentation(1.0f);
if (image_skia_rep.scale() != 1.0f) {
return image;
}
const SkBitmap& bitmap = image_skia_rep.GetBitmap();
if (bitmap.height() * bitmap.width() > max_area &&
(bitmap.width() > max_width || bitmap.height() > max_height)) {
double scale = std::min(static_cast<double>(max_width) / bitmap.width(),
static_cast<double>(max_height) / bitmap.height());
int width = std::clamp<int>(scale * bitmap.width(), 1, max_width);
int height = std::clamp<int>(scale * bitmap.height(), 1, max_height);
SkBitmap new_bitmap = skia::ImageOperations::Resize(
bitmap, skia::ImageOperations::RESIZE_GOOD, width, height);
return Image(ImageSkia(ImageSkiaRep(new_bitmap, 0.0f)));
}
return image;
}
// The MacOS implementation of this function is in image_utils_mac.mm.
#if !BUILDFLAG(IS_MAC)
std::optional<std::vector<uint8_t>> JPEG1xEncodedDataFromImage(
const Image& image,
int quality) {
return JPEG1xEncodedDataFromSkiaRepresentation(image, quality);
}
#endif // !BUILDFLAG(IS_MAC)
std::optional<std::vector<uint8_t>> JPEG1xEncodedDataFromSkiaRepresentation(
const Image& image,
int quality) {
const gfx::ImageSkiaRep& image_skia_rep =
image.AsImageSkia().GetRepresentation(1.0f);
if (image_skia_rep.scale() != 1.0f) {
return std::nullopt;
}
const SkBitmap& bitmap = image_skia_rep.GetBitmap();
if (!bitmap.readyToDraw()) {
return std::nullopt;
}
return gfx::JPEGCodec::Encode(bitmap, quality);
}
std::optional<std::vector<uint8_t>> WebpEncodedDataFromImage(const Image& image,
int quality) {
const SkBitmap bitmap = image.AsBitmap();
return gfx::WebpCodec::Encode(bitmap, quality);
}
Image ResizedImage(const Image& image, const gfx::Size& size) {
const gfx::ImageSkiaRep& image_skia_rep =
image.AsImageSkia().GetRepresentation(1.0f);
if (image_skia_rep.scale() != 1.0f || image_skia_rep.pixel_size() == size) {
return image;
}
SkBitmap new_bitmap = skia::ImageOperations::Resize(
image_skia_rep.GetBitmap(), skia::ImageOperations::RESIZE_GOOD,
size.width(), size.height());
return Image(ImageSkia(ImageSkiaRep(new_bitmap, 0.0f)));
}
#endif // !BUILDFLAG(IS_IOS)
VisibleMargins GetVisibleMargins(const ImageSkia& image) {
VisibleMargins margins;
if (!image.HasRepresentation(1.f))
return margins;
const SkBitmap& bitmap = image.GetRepresentation(1.f).GetBitmap();
if (bitmap.drawsNothing() || bitmap.isOpaque())
return margins;
int x = 0;
for (; x < bitmap.width(); ++x) {
if (ColumnHasVisiblePixels(bitmap, x)) {
margins.left = x;
break;
}
}
if (x == bitmap.width()) {
// Image is fully transparent. Divide the width in half, giving the leading
// region the extra pixel for odd widths.
margins.left = (bitmap.width() + 1) / 2;
margins.right = bitmap.width() - margins.left;
return margins;
}
// Since we already know column margins.left is non-transparent, we can avoid
// rechecking that column; hence the '>' here.
for (x = bitmap.width() - 1; x > margins.left; --x) {
if (ColumnHasVisiblePixels(bitmap, x))
break;
}
margins.right = bitmap.width() - 1 - x;
return margins;
}
} // namespace gfx
|
