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
|
/*
* 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 "SkColorSpace_Base.h"
#include "SkGradientShader.h"
#include "SkPM4fPriv.h"
#include "SkSurface.h"
static const int gRectSize = 50;
static const SkScalar gScalarSize = SkIntToScalar(gRectSize);
static const int gTestWidth = 700;
static const int gTestHeight = 300;
struct CellRenderer {
virtual void draw(SkCanvas* canvas) = 0;
virtual const char* label() = 0;
virtual ~CellRenderer() {}
};
struct PaintColorCellRenderer : public CellRenderer {
PaintColorCellRenderer(SkColor color) : fColor(color) {}
void draw(SkCanvas* canvas) override {
canvas->drawColor(fColor);
}
const char* label() override {
return "Paint Color";
}
protected:
SkColor fColor;
};
struct BitmapCellRenderer : public CellRenderer {
BitmapCellRenderer(SkColor color, SkFilterQuality quality, float scale = 1.0f)
: fQuality(quality) {
int scaledSize = SkFloatToIntRound(scale * gRectSize);
fBitmap.allocPixels(SkImageInfo::MakeS32(scaledSize, scaledSize, kPremul_SkAlphaType));
fBitmap.eraseColor(color);
const char* qualityNames[] = { "None", "Low", "Medium", "High" };
fLabel = SkStringPrintf("Bitmap (%s)", qualityNames[quality]);
}
void draw(SkCanvas* canvas) override {
SkPaint paint;
paint.setFilterQuality(fQuality);
canvas->drawBitmapRect(fBitmap, SkRect::MakeIWH(gRectSize, gRectSize), &paint);
}
const char* label() override {
return fLabel.c_str();
}
protected:
SkFilterQuality fQuality;
SkBitmap fBitmap;
SkString fLabel;
};
struct GradientCellRenderer : public CellRenderer {
GradientCellRenderer(SkColor colorOne, SkColor colorTwo, bool manyStops) {
fColors[0] = colorOne;
fColors[1] = colorTwo;
fManyStops = manyStops;
}
void draw(SkCanvas* canvas) override {
SkPoint points[2] = {
SkPoint::Make(0, 0),
SkPoint::Make(0, gScalarSize)
};
SkPaint paint;
if (fManyStops) {
SkColor colors[4] ={
fColors[0], fColors[0], fColors[1], fColors[1]
};
paint.setShader(SkGradientShader::MakeLinear(points, colors, nullptr, 4,
SkShader::kClamp_TileMode));
} else {
paint.setShader(SkGradientShader::MakeLinear(points, fColors, nullptr, 2,
SkShader::kClamp_TileMode));
}
canvas->drawPaint(paint);
}
const char* label() override {
return "Linear Gradient";
}
protected:
SkColor fColors[2];
bool fManyStops;
};
struct VerticesCellRenderer : public CellRenderer {
VerticesCellRenderer(SkColor colorOne, SkColor colorTwo) {
fColors[0] = fColors[1] = colorOne;
fColors[2] = fColors[3] = colorTwo;
}
void draw(SkCanvas* canvas) override {
SkPaint paint;
SkPoint vertices[4] = {
SkPoint::Make(0, 0),
SkPoint::Make(gScalarSize, 0),
SkPoint::Make(gScalarSize, gScalarSize),
SkPoint::Make(0, gScalarSize)
};
canvas->drawVertices(SkCanvas::kTriangleFan_VertexMode, 4, vertices, nullptr, fColors,
nullptr, nullptr, 0, paint);
}
const char* label() override {
return "Vertices";
}
protected:
SkColor fColors[4];
};
static void draw_gamut_grid(SkCanvas* canvas, SkTArray<SkAutoTDelete<CellRenderer>>& renderers) {
// We want our colors in our wide gamut to be obviously visibly distorted from sRGB, so we use
// Wide Gamut RGB (with sRGB gamma, for HW acceleration) as the working space for this test:
const float gWideGamutRGB_toXYZD50[]{
0.7161046f, 0.1009296f, 0.1471858f, // -> X
0.2581874f, 0.7249378f, 0.0168748f, // -> Y
0.0000000f, 0.0517813f, 0.7734287f, // -> Z
};
SkMatrix44 wideGamutRGB_toXYZD50(SkMatrix44::kUninitialized_Constructor);
wideGamutRGB_toXYZD50.set3x3RowMajorf(gWideGamutRGB_toXYZD50);
// Use the original canvas' color type, but account for gamma requirements
SkImageInfo origInfo = canvas->imageInfo();
sk_sp<SkColorSpace> srgbCS;
sk_sp<SkColorSpace> wideCS;
switch (origInfo.colorType()) {
case kRGBA_8888_SkColorType:
case kBGRA_8888_SkColorType:
srgbCS = SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named);
wideCS = SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma,
wideGamutRGB_toXYZD50);
break;
case kRGBA_F16_SkColorType:
srgbCS = SkColorSpace::MakeNamed(SkColorSpace::kSRGBLinear_Named);
wideCS = SkColorSpace::MakeRGB(SkColorSpace::kLinear_RenderTargetGamma,
wideGamutRGB_toXYZD50);
break;
default:
return;
}
SkASSERT(srgbCS);
SkASSERT(wideCS);
// Make our two working surfaces (one sRGB, one Adobe)
SkImageInfo srgbGamutInfo = SkImageInfo::Make(gRectSize, gRectSize, origInfo.colorType(),
kPremul_SkAlphaType, srgbCS);
SkImageInfo wideGamutInfo = SkImageInfo::Make(gRectSize, gRectSize, origInfo.colorType(),
kPremul_SkAlphaType, wideCS);
// readPixels doesn't do color conversion (yet), so we can use it to see the raw (wide) data
SkImageInfo dstInfo = srgbGamutInfo.makeColorSpace(nullptr);
sk_sp<SkSurface> srgbGamutSurface = canvas->makeSurface(srgbGamutInfo);
sk_sp<SkSurface> wideGamutSurface = canvas->makeSurface(wideGamutInfo);
if (!srgbGamutSurface || !wideGamutSurface) {
return;
}
SkCanvas* srgbGamutCanvas = srgbGamutSurface->getCanvas();
SkCanvas* wideGamutCanvas = wideGamutSurface->getCanvas();
SkPaint textPaint;
textPaint.setAntiAlias(true);
textPaint.setColor(SK_ColorWHITE);
sk_tool_utils::set_portable_typeface(&textPaint);
SkScalar x = 0, y = 0;
SkScalar textHeight = textPaint.getFontSpacing();
for (const auto& renderer : renderers) {
srgbGamutCanvas->clear(SK_ColorBLACK);
renderer->draw(srgbGamutCanvas);
wideGamutCanvas->clear(SK_ColorBLACK);
renderer->draw(wideGamutCanvas);
canvas->drawText(renderer->label(), strlen(renderer->label()), x, y + textHeight,
textPaint);
SkBitmap srgbBitmap;
srgbBitmap.setInfo(dstInfo);
srgbGamutCanvas->readPixels(&srgbBitmap, 0, 0);
canvas->drawBitmap(srgbBitmap, x, y + textHeight + 5);
x += (gScalarSize + 1);
SkBitmap wideBitmap;
wideBitmap.setInfo(dstInfo);
wideGamutCanvas->readPixels(&wideBitmap, 0, 0);
canvas->drawBitmap(wideBitmap, x, y + textHeight + 5);
x += (gScalarSize + 10);
if (x + (2 * gScalarSize + 1) > gTestWidth) {
x = 0;
y += (textHeight + gScalarSize + 10);
}
}
}
DEF_SIMPLE_GM_BG(gamut, canvas, gTestWidth, gTestHeight, SK_ColorBLACK) {
SkTArray<SkAutoTDelete<CellRenderer>> renderers;
// sRGB primaries, rendered as paint color
renderers.push_back(new PaintColorCellRenderer(SK_ColorRED));
renderers.push_back(new PaintColorCellRenderer(SK_ColorGREEN));
// sRGB primaries, rendered as bitmaps
renderers.push_back(new BitmapCellRenderer(SK_ColorRED, kNone_SkFilterQuality));
renderers.push_back(new BitmapCellRenderer(SK_ColorGREEN, kLow_SkFilterQuality));
// Larger bitmap to trigger mipmaps
renderers.push_back(new BitmapCellRenderer(SK_ColorRED, kMedium_SkFilterQuality, 2.0f));
// Smaller bitmap to trigger bicubic
renderers.push_back(new BitmapCellRenderer(SK_ColorGREEN, kHigh_SkFilterQuality, 0.5f));
// Various gradients involving sRGB primaries and white/black
// First with just two stops (implemented with uniforms on GPU)
renderers.push_back(new GradientCellRenderer(SK_ColorRED, SK_ColorGREEN, false));
renderers.push_back(new GradientCellRenderer(SK_ColorGREEN, SK_ColorBLACK, false));
renderers.push_back(new GradientCellRenderer(SK_ColorGREEN, SK_ColorWHITE, false));
// ... and then with four stops (implemented with textures on GPU)
renderers.push_back(new GradientCellRenderer(SK_ColorRED, SK_ColorGREEN, true));
renderers.push_back(new GradientCellRenderer(SK_ColorGREEN, SK_ColorBLACK, true));
renderers.push_back(new GradientCellRenderer(SK_ColorGREEN, SK_ColorWHITE, true));
// Vertex colors
renderers.push_back(new VerticesCellRenderer(SK_ColorRED, SK_ColorRED));
renderers.push_back(new VerticesCellRenderer(SK_ColorRED, SK_ColorGREEN));
draw_gamut_grid(canvas, renderers);
}
|
