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
|
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <functional>
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkColor.h"
#include "SkColorPriv.h"
#include "SkSurface.h"
#include "SkTaskGroup.h"
#include "SkUtils.h"
#include "Test.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "GrContextPriv.h"
#include "GrResourceProvider.h"
#include "GrSurfaceContext.h"
#include "GrSurfaceProxy.h"
#include "GrTest.h"
#include "GrTexture.h"
#endif
struct Results { int diffs, diffs_0x00, diffs_0xff, diffs_by_1; };
static bool acceptable(const Results& r) {
#if 0
SkDebugf("%d diffs, %d at 0x00, %d at 0xff, %d off by 1, all out of 65536\n",
r.diffs, r.diffs_0x00, r.diffs_0xff, r.diffs_by_1);
#endif
return r.diffs_by_1 == r.diffs // never off by more than 1
&& r.diffs_0x00 == 0 // transparent must stay transparent
&& r.diffs_0xff == 0; // opaque must stay opaque
}
template <typename Fn>
static Results test(Fn&& multiply) {
Results r = { 0,0,0,0 };
for (int x = 0; x < 256; x++) {
for (int y = 0; y < 256; y++) {
int p = multiply(x, y),
ideal = (x*y+127)/255;
if (p != ideal) {
r.diffs++;
if (x == 0x00 || y == 0x00) { r.diffs_0x00++; }
if (x == 0xff || y == 0xff) { r.diffs_0xff++; }
if (SkTAbs(ideal - p) == 1) { r.diffs_by_1++; }
}
}}
return r;
}
DEF_TEST(Blend_byte_multiply, r) {
// These are all temptingly close but fundamentally broken.
int (*broken[])(int, int) = {
[](int x, int y) { return (x*y)>>8; },
[](int x, int y) { return (x*y+128)>>8; },
[](int x, int y) { y += y>>7; return (x*y)>>8; },
};
for (auto multiply : broken) { REPORTER_ASSERT(r, !acceptable(test(multiply))); }
// These are fine to use, but not perfect.
int (*fine[])(int, int) = {
[](int x, int y) { return (x*y+x)>>8; },
[](int x, int y) { return (x*y+y)>>8; },
[](int x, int y) { return (x*y+255)>>8; },
[](int x, int y) { y += y>>7; return (x*y+128)>>8; },
};
for (auto multiply : fine) { REPORTER_ASSERT(r, acceptable(test(multiply))); }
// These are pefect.
int (*perfect[])(int, int) = {
[](int x, int y) { return (x*y+127)/255; }, // Duh.
[](int x, int y) { int p = (x*y+128); return (p+(p>>8))>>8; },
[](int x, int y) { return ((x*y+128)*257)>>16; },
};
for (auto multiply : perfect) { REPORTER_ASSERT(r, test(multiply).diffs == 0); }
}
#if SK_SUPPORT_GPU
namespace {
static sk_sp<SkSurface> create_gpu_surface_backend_texture_as_render_target(
GrContext* context, int sampleCnt, int width, int height, GrPixelConfig config,
GrSurfaceOrigin origin,
sk_sp<GrTexture>* backingSurface) {
GrSurfaceDesc backingDesc;
backingDesc.fFlags = kRenderTarget_GrSurfaceFlag;
backingDesc.fOrigin = origin;
backingDesc.fWidth = width;
backingDesc.fHeight = height;
backingDesc.fConfig = config;
backingDesc.fSampleCnt = sampleCnt;
*backingSurface = context->resourceProvider()->createTexture(backingDesc, SkBudgeted::kNo);
if (!(*backingSurface)) {
return nullptr;
}
GrBackendTexture backendTex =
GrTest::CreateBackendTexture(context->contextPriv().getBackend(),
width,
height,
config,
(*backingSurface)->getTextureHandle());
sk_sp<SkSurface> surface =
SkSurface::MakeFromBackendTextureAsRenderTarget(context, backendTex, origin,
sampleCnt, nullptr, nullptr);
return surface;
}
}
// Tests blending to a surface with no texture available.
DEF_GPUTEST_FOR_GL_RENDERING_CONTEXTS(ES2BlendWithNoTexture, reporter, ctxInfo) {
GrContext* context = ctxInfo.grContext();
const int kWidth = 10;
const int kHeight = 10;
const GrPixelConfig kConfig = kRGBA_8888_GrPixelConfig;
const SkColorType kColorType = kRGBA_8888_SkColorType;
// Build our test cases:
struct RectAndSamplePoint {
SkRect rect;
SkIPoint outPoint;
SkIPoint inPoint;
} allRectsAndPoints[3] = {
{SkRect::MakeXYWH(0, 0, 5, 5), SkIPoint::Make(7, 7), SkIPoint::Make(2, 2)},
{SkRect::MakeXYWH(2, 2, 5, 5), SkIPoint::Make(1, 1), SkIPoint::Make(4, 4)},
{SkRect::MakeXYWH(5, 5, 5, 5), SkIPoint::Make(2, 2), SkIPoint::Make(7, 7)},
};
struct TestCase {
RectAndSamplePoint fRectAndPoints;
SkRect fClip;
int fSampleCnt;
GrSurfaceOrigin fOrigin;
};
std::vector<TestCase> testCases;
for (auto origin : { kTopLeft_GrSurfaceOrigin, kBottomLeft_GrSurfaceOrigin}) {
for (int sampleCnt : {0, 4}) {
for (auto rectAndPoints : allRectsAndPoints) {
for (auto clip : {SkRect::MakeXYWH(0, 0, 10, 10), SkRect::MakeXYWH(1, 1, 8, 8)}) {
testCases.push_back({rectAndPoints, clip, sampleCnt, origin});
}
}
}
}
// Run each test case:
for (auto testCase : testCases) {
int sampleCnt = testCase.fSampleCnt;
SkRect paintRect = testCase.fRectAndPoints.rect;
SkIPoint outPoint = testCase.fRectAndPoints.outPoint;
SkIPoint inPoint = testCase.fRectAndPoints.inPoint;
GrSurfaceOrigin origin = testCase.fOrigin;
sk_sp<GrTexture> backingSurface;
// BGRA forces a framebuffer blit on ES2.
sk_sp<SkSurface> surface = create_gpu_surface_backend_texture_as_render_target(
context, sampleCnt, kWidth, kHeight, kConfig, origin, &backingSurface);
if (!surface && sampleCnt > 0) {
// Some platforms don't support MSAA.
continue;
}
REPORTER_ASSERT(reporter, !!surface);
// Fill our canvas with 0xFFFF80
SkCanvas* canvas = surface->getCanvas();
canvas->clipRect(testCase.fClip, false);
SkPaint black_paint;
black_paint.setColor(SkColorSetRGB(0xFF, 0xFF, 0x80));
canvas->drawRect(SkRect::MakeXYWH(0, 0, kWidth, kHeight), black_paint);
// Blend 2x2 pixels at 5,5 with 0x80FFFF. Use multiply blend mode as this will trigger
// a copy of the destination.
SkPaint white_paint;
white_paint.setColor(SkColorSetRGB(0x80, 0xFF, 0xFF));
white_paint.setBlendMode(SkBlendMode::kMultiply);
canvas->drawRect(paintRect, white_paint);
// Read the result into a bitmap.
SkBitmap bitmap;
REPORTER_ASSERT(reporter, bitmap.tryAllocPixels(SkImageInfo::Make(
kWidth, kHeight, kColorType, kPremul_SkAlphaType)));
REPORTER_ASSERT(
reporter,
surface->readPixels(bitmap.info(), bitmap.getPixels(), bitmap.rowBytes(), 0, 0));
// Check the in/out pixels.
REPORTER_ASSERT(reporter, bitmap.getColor(outPoint.x(), outPoint.y()) ==
SkColorSetRGB(0xFF, 0xFF, 0x80));
REPORTER_ASSERT(reporter, bitmap.getColor(inPoint.x(), inPoint.y()) ==
SkColorSetRGB(0x80, 0xFF, 0x80));
// Clean up - surface depends on backingSurface and must be released first.
surface.reset();
backingSurface.reset();
}
}
#endif
|
