GradientTest.cpp revision e94b5e40c5fb0e36eebcae1abfe04b9bc33583f4 
1
2/*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8#include "Test.h"
9#include "SkDevice.h"
10#include "SkTemplates.h"
11#include "SkShader.h"
12#include "SkColorShader.h"
13#include "SkEmptyShader.h"
14#include "SkGradientShader.h"
15
16struct GradRec {
17    int             fColorCount;
18    const SkColor*  fColors;
19    const SkScalar* fPos;
20    const SkPoint*  fPoint;   // 2
21    const SkScalar* fRadius; // 2
22    SkShader::TileMode fTileMode;
23
24    void gradCheck(skiatest::Reporter* reporter, SkShader* shader,
25                   SkShader::GradientInfo* info,
26                   SkShader::GradientType gt) const {
27        SkAutoTMalloc<SkColor> colorStorage(fColorCount);
28        SkAutoTMalloc<SkScalar> posStorage(fColorCount);
29
30        info->fColorCount = fColorCount;
31        info->fColors = colorStorage;
32        info->fColorOffsets = posStorage.get();
33        REPORTER_ASSERT(reporter, shader->asAGradient(info) == gt);
34
35        REPORTER_ASSERT(reporter, info->fColorCount == fColorCount);
36        REPORTER_ASSERT(reporter,
37                        !memcmp(info->fColors, fColors, fColorCount * sizeof(SkColor)));
38        REPORTER_ASSERT(reporter,
39                        !memcmp(info->fColorOffsets, fPos, fColorCount * sizeof(SkScalar)));
40        REPORTER_ASSERT(reporter, fTileMode == info->fTileMode);
41    }
42};
43
44
45static void none_gradproc(skiatest::Reporter* reporter, const GradRec& rec) {
46    SkAutoTUnref<SkShader> s(new SkEmptyShader);
47    REPORTER_ASSERT(reporter, SkShader::kNone_GradientType == s->asAGradient(NULL));
48}
49
50static void color_gradproc(skiatest::Reporter* reporter, const GradRec& rec) {
51    SkAutoTUnref<SkShader> s(new SkColorShader(rec.fColors[0]));
52    REPORTER_ASSERT(reporter, SkShader::kColor_GradientType == s->asAGradient(NULL));
53
54    SkShader::GradientInfo info;
55    info.fColorCount = 0;
56    s->asAGradient(&info);
57    REPORTER_ASSERT(reporter, 1 == info.fColorCount);
58}
59
60static void linear_gradproc(skiatest::Reporter* reporter, const GradRec& rec) {
61    SkAutoTUnref<SkShader> s(SkGradientShader::CreateLinear(rec.fPoint,
62                                                            rec.fColors,
63                                                            rec.fPos,
64                                                            rec.fColorCount,
65                                                            rec.fTileMode));
66
67    SkShader::GradientInfo info;
68    rec.gradCheck(reporter, s, &info, SkShader::kLinear_GradientType);
69    REPORTER_ASSERT(reporter, !memcmp(info.fPoint, rec.fPoint, 2 * sizeof(SkPoint)));
70}
71
72static void radial_gradproc(skiatest::Reporter* reporter, const GradRec& rec) {
73    SkAutoTUnref<SkShader> s(SkGradientShader::CreateRadial(rec.fPoint[0],
74                                                            rec.fRadius[0],
75                                                            rec.fColors,
76                                                            rec.fPos,
77                                                            rec.fColorCount,
78                                                            rec.fTileMode));
79
80    SkShader::GradientInfo info;
81    rec.gradCheck(reporter, s, &info, SkShader::kRadial_GradientType);
82    REPORTER_ASSERT(reporter, info.fPoint[0] == rec.fPoint[0]);
83    REPORTER_ASSERT(reporter, info.fRadius[0] == rec.fRadius[0]);
84}
85
86static void radial2_gradproc(skiatest::Reporter* reporter, const GradRec& rec) {
87    SkAutoTUnref<SkShader> s(SkGradientShader::CreateTwoPointRadial(rec.fPoint[0],
88                                                            rec.fRadius[0],
89                                                            rec.fPoint[1],
90                                                            rec.fRadius[1],
91                                                            rec.fColors,
92                                                            rec.fPos,
93                                                            rec.fColorCount,
94                                                            rec.fTileMode));
95
96    SkShader::GradientInfo info;
97    rec.gradCheck(reporter, s, &info, SkShader::kRadial2_GradientType);
98    REPORTER_ASSERT(reporter, !memcmp(info.fPoint, rec.fPoint, 2 * sizeof(SkPoint)));
99    REPORTER_ASSERT(reporter, !memcmp(info.fRadius, rec.fRadius, 2 * sizeof(SkScalar)));
100}
101
102static void sweep_gradproc(skiatest::Reporter* reporter, const GradRec& rec) {
103    SkAutoTUnref<SkShader> s(SkGradientShader::CreateSweep(rec.fPoint[0].fX,
104                                                           rec.fPoint[0].fY,
105                                                           rec.fColors,
106                                                           rec.fPos,
107                                                           rec.fColorCount));
108
109    SkShader::GradientInfo info;
110    rec.gradCheck(reporter, s, &info, SkShader::kSweep_GradientType);
111    REPORTER_ASSERT(reporter, info.fPoint[0] == rec.fPoint[0]);
112}
113
114static void conical_gradproc(skiatest::Reporter* reporter, const GradRec& rec) {
115    SkAutoTUnref<SkShader> s(SkGradientShader::CreateTwoPointConical(rec.fPoint[0],
116                                                             rec.fRadius[0],
117                                                             rec.fPoint[1],
118                                                             rec.fRadius[1],
119                                                             rec.fColors,
120                                                             rec.fPos,
121                                                             rec.fColorCount,
122                                                             rec.fTileMode));
123
124    SkShader::GradientInfo info;
125    rec.gradCheck(reporter, s, &info, SkShader::kConical_GradientType);
126    REPORTER_ASSERT(reporter, !memcmp(info.fPoint, rec.fPoint, 2 * sizeof(SkPoint)));
127    REPORTER_ASSERT(reporter, !memcmp(info.fRadius, rec.fRadius, 2 * sizeof(SkScalar)));
128}
129
130// Ensure that repeated color gradients behave like drawing a single color
131static void TestConstantGradient(skiatest::Reporter* reporter) {
132    const SkPoint pts[] = {
133        { 0, 0 },
134        { SkIntToScalar(10), 0 }
135    };
136    SkColor colors[] = { SK_ColorBLUE, SK_ColorBLUE };
137    const SkScalar pos[] = { 0, SK_Scalar1 };
138    SkAutoTUnref<SkShader> s(SkGradientShader::CreateLinear(pts,
139                                                            colors,
140                                                            pos,
141                                                            2,
142                                                            SkShader::kClamp_TileMode));
143    SkBitmap outBitmap;
144    outBitmap.setConfig(SkBitmap::kARGB_8888_Config, 10, 1);
145    outBitmap.allocPixels();
146    SkPaint paint;
147    paint.setShader(s.get());
148    SkDevice device(outBitmap);
149    SkCanvas canvas(&device);
150    canvas.drawPaint(paint);
151    SkAutoLockPixels alp(outBitmap);
152    for (int i = 0; i < 10; i++) {
153        // The following is commented out because it currently fails
154        // Related bug: https://code.google.com/p/skia/issues/detail?id=1098
155
156        // REPORTER_ASSERT(reporter, SK_ColorBLUE == outBitmap.getColor(i, 0));
157    }
158}
159
160typedef void (*GradProc)(skiatest::Reporter* reporter, const GradRec&);
161
162static void TestGradientShaders(skiatest::Reporter* reporter) {
163    static const SkColor gColors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
164    static const SkScalar gPos[] = { 0, SK_ScalarHalf, SK_Scalar1 };
165    static const SkPoint gPts[] = {
166        { 0, 0 },
167        { SkIntToScalar(10), SkIntToScalar(20) }
168    };
169    static const SkScalar gRad[] = { SkIntToScalar(1), SkIntToScalar(2) };
170
171    GradRec rec;
172    rec.fColorCount = SK_ARRAY_COUNT(gColors);
173    rec.fColors = gColors;
174    rec.fPos = gPos;
175    rec.fPoint = gPts;
176    rec.fRadius = gRad;
177    rec.fTileMode = SkShader::kClamp_TileMode;
178
179    static const GradProc gProcs[] = {
180        none_gradproc,
181        color_gradproc,
182        linear_gradproc,
183        radial_gradproc,
184        radial2_gradproc,
185        sweep_gradproc,
186        conical_gradproc,
187    };
188
189    for (size_t i = 0; i < SK_ARRAY_COUNT(gProcs); ++i) {
190        gProcs[i](reporter, rec);
191    }
192}
193
194static void TestGradients(skiatest::Reporter* reporter) {
195    TestGradientShaders(reporter);
196    TestConstantGradient(reporter);
197}
198#include "TestClassDef.h"
199DEFINE_TESTCLASS("Gradients", TestGradientsClass, TestGradients)
200