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
|
/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "Resources.h"
#include "SkBitmapScaler.h"
#include "SkGradientShader.h"
#include "SkTypeface.h"
#include "SkImageDecoder.h"
#include "SkStream.h"
#include "SkPaint.h"
#include "SkMipMap.h"
#include "Resources.h"
#include "sk_tool_utils.h"
static SkBitmap make_bitmap(int size) {
SkBitmap bm;
bm.allocN32Pixels(size, size);
SkCanvas canvas(bm);
canvas.clear(0xFFFFFFFF);
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(size / 16.0f);
canvas.drawCircle(size/2.0f, size/2.0f, size/3.0f, paint);
return bm;
}
static SkBitmap make_bitmap2(int size) {
SkBitmap bm;
bm.allocN32Pixels(size, size);
SkCanvas canvas(bm);
canvas.clear(0xFFFFFFFF);
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
SkScalar inset = 2;
SkRect r = SkRect::MakeIWH(size, size).makeInset(0.5f, 0.5f);
while (r.width() > 4) {
canvas.drawRect(r, paint);
r.inset(inset, inset);
inset += 1;
}
return bm;
}
#include "SkNx.h"
static SkBitmap make_bitmap3(int size) {
SkBitmap bm;
bm.allocN32Pixels(size, size);
SkCanvas canvas(bm);
canvas.clear(0xFFFFFFFF);
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(2.1f);
SkScalar s = SkIntToScalar(size);
Sk4f p(s, -s, -s, s);
Sk4f d(5);
while (p.kth<1>() < s) {
canvas.drawLine(p.kth<0>(),p.kth<1>(), p.kth<2>(), p.kth<3>(), paint);
p = p + d;
}
return bm;
}
class ShowMipLevels : public skiagm::GM {
const int fN;
SkBitmap fBM[4];
public:
static unsigned gamma(unsigned n) {
float x = n / 255.0f;
#if 0
x = sqrtf(x);
#else
if (x > 0.0031308f) {
x = 1.055f * (powf(x, (1.0f / 2.4f))) - 0.055f;
} else {
x = 12.92f * x;
}
#endif
return (int)(x * 255);
}
static void apply_gamma(const SkBitmap& bm) {
return; // below is our experiment for sRGB correction
bm.lockPixels();
for (int y = 0; y < bm.height(); ++y) {
for (int x = 0; x < bm.width(); ++x) {
SkPMColor c = *bm.getAddr32(x, y);
unsigned r = gamma(SkGetPackedR32(c));
unsigned g = gamma(SkGetPackedG32(c));
unsigned b = gamma(SkGetPackedB32(c));
*bm.getAddr32(x, y) = SkPackARGB32(0xFF, r, g, b);
}
}
}
ShowMipLevels(int N) : fN(N) {
fBM[0] = sk_tool_utils::create_checkerboard_bitmap(N, N, SK_ColorBLACK, SK_ColorWHITE, 2);
fBM[1] = make_bitmap(N);
fBM[2] = make_bitmap2(N);
fBM[3] = make_bitmap3(N);
}
protected:
SkString onShortName() override {
SkString str;
str.printf("showmiplevels_%d", fN);
return str;
}
SkISize onISize() override {
return { 824, 862 };
}
static void DrawAndFrame(SkCanvas* canvas, const SkBitmap& orig, SkScalar x, SkScalar y) {
SkBitmap bm;
orig.copyTo(&bm);
apply_gamma(bm);
canvas->drawBitmap(bm, x, y, nullptr);
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
paint.setColor(0xFFFFCCCC);
canvas->drawRect(SkRect::MakeIWH(bm.width(), bm.height()).makeOffset(x, y).makeOutset(0.5f, 0.5f), paint);
}
template <typename F> void drawLevels(SkCanvas* canvas, const SkBitmap& baseBM, F func) {
SkScalar x = 4;
SkScalar y = 4;
SkPixmap prevPM;
baseBM.lockPixels();
baseBM.peekPixels(&prevPM);
SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(baseBM, nullptr));
int index = 0;
SkMipMap::Level level;
SkScalar scale = 0.5f;
while (mm->extractLevel(scale, &level)) {
SkImageInfo info = SkImageInfo::MakeN32Premul(level.fWidth, level.fHeight);
SkPixmap levelPM{ info, level.fPixels, level.fRowBytes };
SkBitmap bm = func(prevPM, levelPM);
DrawAndFrame(canvas, bm, x, y);
if (info.width() <= 2 || info.height() <= 2) {
break;
}
if (index & 1) {
x += info.width() + 4;
} else {
y += info.height() + 4;
}
scale /= 2;
prevPM = levelPM;
index += 1;
}
}
void drawSet(SkCanvas* canvas, const SkBitmap& orig) {
SkAutoCanvasRestore acr(canvas, true);
drawLevels(canvas, orig, [](const SkPixmap& prev, const SkPixmap& curr) {
SkBitmap bm;
bm.installPixels(curr);
return bm;
});
const SkBitmapScaler::ResizeMethod methods[] = {
SkBitmapScaler::RESIZE_BOX,
SkBitmapScaler::RESIZE_TRIANGLE,
SkBitmapScaler::RESIZE_LANCZOS3,
SkBitmapScaler::RESIZE_HAMMING,
SkBitmapScaler::RESIZE_MITCHELL,
};
SkPixmap basePM;
orig.lockPixels();
orig.peekPixels(&basePM);
for (auto method : methods) {
canvas->translate(orig.width()/2 + 8.0f, 0);
drawLevels(canvas, orig, [basePM, method](const SkPixmap& prev, const SkPixmap& curr) {
SkBitmap bm;
SkBitmapScaler::Resize(&bm, prev, method, curr.width(), curr.height());
return bm;
});
}
}
void onDraw(SkCanvas* canvas) override {
canvas->translate(4, 4);
for (const auto& bm : fBM) {
this->drawSet(canvas, bm);
canvas->translate(0, bm.height() * 0.85f);
}
}
private:
typedef skiagm::GM INHERITED;
};
DEF_GM( return new ShowMipLevels(255); )
DEF_GM( return new ShowMipLevels(256); )
|
