1/*
2 * Copyright 2017 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#include "include/core/SkBitmap.h"
9#include "include/core/SkColor.h"
10#include "include/core/SkColorSpace.h"
11#include "include/core/SkImageInfo.h"
12#include "include/core/SkMatrix.h"
13#include "include/core/SkPath.h"
14#include "include/core/SkRect.h"
15#include "include/core/SkRefCnt.h"
16#include "include/core/SkStrokeRec.h"
17#include "include/core/SkSurface.h"
18#include "include/core/SkTypes.h"
19#include "include/gpu/GrBackendSurface.h"
20#include "include/gpu/GrContextOptions.h"
21#include "include/gpu/GrDirectContext.h"
22#include "include/gpu/GrTypes.h"
23#include "include/private/GrTypesPriv.h"
24#include "include/private/SkColorData.h"
25#include "src/gpu/GrCaps.h"
26#include "src/gpu/GrDirectContextPriv.h"
27#include "src/gpu/GrFragmentProcessor.h"
28#include "src/gpu/GrImageInfo.h"
29#include "src/gpu/GrPaint.h"
30#include "src/gpu/GrStyle.h"
31#include "src/gpu/v1/SurfaceDrawContext_v1.h"
32#include "tests/Test.h"
33#include "tools/gpu/GrContextFactory.h"
34
35#include <utility>
36
37static void only_allow_default(GrContextOptions* options) {
38    options->fGpuPathRenderers = GpuPathRenderers::kNone;
39}
40
41static SkBitmap read_back(GrDirectContext* dContext,
42                          skgpu::v1::SurfaceDrawContext* sdc,
43                          int width, int height) {
44
45    SkImageInfo dstII = SkImageInfo::MakeN32Premul(width, height);
46
47    SkBitmap bm;
48    bm.allocPixels(dstII);
49
50    sdc->readPixels(dContext, bm.pixmap(), {0, 0});
51
52    return bm;
53}
54
55static SkPath make_path(const SkRect& outer, int inset, SkPathFillType fill) {
56    SkPath p;
57
58    p.addRect(outer, SkPathDirection::kCW);
59    p.addRect(outer.makeInset(inset, inset), SkPathDirection::kCCW);
60    p.setFillType(fill);
61    return p;
62}
63
64
65static const int kBigSize = 64; // This should be a power of 2
66static const int kPad = 3;
67
68// From crbug.com/769898:
69//   create an approx fit render target context that will have extra space (i.e., npot)
70//   draw an inverse wound concave path into it - forcing use of the stencil-using path renderer
71//   throw the RTC away so the backing GrSurface/GrStencilBuffer can be reused
72//   create a new render target context that will reuse the prior GrSurface
73//   draw a normally wound concave path that touches outside of the approx fit RTC's content rect
74//
75// When the bug manifests the DefaultPathRenderer/GrMSAAPathRenderer is/was leaving the stencil
76// buffer outside of the first content rect in a bad state and the second draw would be incorrect.
77
78static void run_test(GrDirectContext* dContext, skiatest::Reporter* reporter) {
79    SkPath invPath = make_path(SkRect::MakeXYWH(0, 0, kBigSize, kBigSize),
80                               kBigSize/2-1, SkPathFillType::kInverseWinding);
81    SkPath path = make_path(SkRect::MakeXYWH(0, 0, kBigSize, kBigSize),
82                            kPad, SkPathFillType::kWinding);
83
84    GrStyle style(SkStrokeRec::kFill_InitStyle);
85
86    {
87        auto sdc = skgpu::v1::SurfaceDrawContext::Make(dContext, GrColorType::kRGBA_8888, nullptr,
88                                                       SkBackingFit::kApprox,
89                                                       {kBigSize/2 + 1, kBigSize/2 + 1},
90                                                       SkSurfaceProps());
91
92        sdc->clear(SK_PMColor4fBLACK);
93
94        GrPaint paint;
95
96        const SkPMColor4f color = { 1.0f, 0.0f, 0.0f, 1.0f };
97        auto fp = GrFragmentProcessor::MakeColor(color);
98        paint.setColorFragmentProcessor(std::move(fp));
99
100        sdc->drawPath(nullptr, std::move(paint), GrAA::kNo, SkMatrix::I(), invPath, style);
101
102        dContext->priv().flushSurface(sdc->asSurfaceProxy());
103    }
104
105    {
106        auto sdc = skgpu::v1::SurfaceDrawContext::Make(dContext, GrColorType::kRGBA_8888, nullptr,
107                                                       SkBackingFit::kExact, {kBigSize, kBigSize},
108                                                       SkSurfaceProps());
109
110        sdc->clear(SK_PMColor4fBLACK);
111
112        GrPaint paint;
113
114        const SkPMColor4f color = { 0.0f, 1.0f, 0.0f, 1.0f };
115        auto fp = GrFragmentProcessor::MakeColor(color);
116        paint.setColorFragmentProcessor(std::move(fp));
117
118        sdc->drawPath(nullptr, std::move(paint), GrAA::kNo,
119                      SkMatrix::I(), path, style);
120
121        SkBitmap bm = read_back(dContext, sdc.get(), kBigSize, kBigSize);
122
123        bool correct = true;
124        for (int y = kBigSize/2+1; y < kBigSize-kPad-1 && correct; ++y) {
125            for (int x = kPad+1; x < kBigSize-kPad-1 && correct; ++x) {
126                correct = bm.getColor(x, y) == SK_ColorBLACK;
127                REPORTER_ASSERT(reporter, correct);
128            }
129        }
130    }
131}
132
133DEF_GPUTEST_FOR_CONTEXTS(DefaultPathRendererTest,
134                         sk_gpu_test::GrContextFactory::IsRenderingContext,
135                         reporter, ctxInfo, only_allow_default) {
136    auto ctx = ctxInfo.directContext();
137
138    run_test(ctx, reporter);
139}
140