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      1 /*
      2  * Copyright 2011 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 "SkCanvas.h"
      9 #include "SkColorShader.h"
     10 #include "SkGradientShader.h"
     11 #include "SkShader.h"
     12 #include "SkTemplates.h"
     13 #include "Test.h"
     14 
     15 struct GradRec {
     16     int             fColorCount;
     17     const SkColor*  fColors;
     18     const SkScalar* fPos;
     19     const SkPoint*  fPoint;   // 2
     20     const SkScalar* fRadius; // 2
     21     SkShader::TileMode fTileMode;
     22 
     23     void gradCheck(skiatest::Reporter* reporter, SkShader* shader,
     24                    SkShader::GradientInfo* info,
     25                    SkShader::GradientType gt) const {
     26         SkAutoTMalloc<SkColor> colorStorage(fColorCount);
     27         SkAutoTMalloc<SkScalar> posStorage(fColorCount);
     28 
     29         info->fColorCount = fColorCount;
     30         info->fColors = colorStorage;
     31         info->fColorOffsets = posStorage.get();
     32         REPORTER_ASSERT(reporter, shader->asAGradient(info) == gt);
     33 
     34         REPORTER_ASSERT(reporter, info->fColorCount == fColorCount);
     35         REPORTER_ASSERT(reporter,
     36                         !memcmp(info->fColors, fColors, fColorCount * sizeof(SkColor)));
     37         REPORTER_ASSERT(reporter,
     38                         !memcmp(info->fColorOffsets, fPos, fColorCount * sizeof(SkScalar)));
     39         REPORTER_ASSERT(reporter, fTileMode == info->fTileMode);
     40     }
     41 };
     42 
     43 
     44 static void none_gradproc(skiatest::Reporter* reporter, const GradRec&) {
     45     SkAutoTUnref<SkShader> s(SkShader::CreateEmptyShader());
     46     REPORTER_ASSERT(reporter, SkShader::kNone_GradientType == s->asAGradient(NULL));
     47 }
     48 
     49 static void color_gradproc(skiatest::Reporter* reporter, const GradRec& rec) {
     50     SkAutoTUnref<SkShader> s(new SkColorShader(rec.fColors[0]));
     51     REPORTER_ASSERT(reporter, SkShader::kColor_GradientType == s->asAGradient(NULL));
     52 
     53     SkShader::GradientInfo info;
     54     info.fColors = NULL;
     55     info.fColorCount = 0;
     56     s->asAGradient(&info);
     57     REPORTER_ASSERT(reporter, 1 == info.fColorCount);
     58 }
     59 
     60 static 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 
     72 static 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 
     86 static 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 
    102 static 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 
    114 static 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
    131 static void TestConstantGradient(skiatest::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.allocN32Pixels(10, 1);
    145     SkPaint paint;
    146     paint.setShader(s.get());
    147     SkCanvas canvas(outBitmap);
    148     canvas.drawPaint(paint);
    149     SkAutoLockPixels alp(outBitmap);
    150     for (int i = 0; i < 10; i++) {
    151         // The following is commented out because it currently fails
    152         // Related bug: https://code.google.com/p/skia/issues/detail?id=1098
    153 
    154         // REPORTER_ASSERT(reporter, SK_ColorBLUE == outBitmap.getColor(i, 0));
    155     }
    156 }
    157 
    158 typedef void (*GradProc)(skiatest::Reporter* reporter, const GradRec&);
    159 
    160 static void TestGradientShaders(skiatest::Reporter* reporter) {
    161     static const SkColor gColors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
    162     static const SkScalar gPos[] = { 0, SK_ScalarHalf, SK_Scalar1 };
    163     static const SkPoint gPts[] = {
    164         { 0, 0 },
    165         { SkIntToScalar(10), SkIntToScalar(20) }
    166     };
    167     static const SkScalar gRad[] = { SkIntToScalar(1), SkIntToScalar(2) };
    168 
    169     GradRec rec;
    170     rec.fColorCount = SK_ARRAY_COUNT(gColors);
    171     rec.fColors = gColors;
    172     rec.fPos = gPos;
    173     rec.fPoint = gPts;
    174     rec.fRadius = gRad;
    175     rec.fTileMode = SkShader::kClamp_TileMode;
    176 
    177     static const GradProc gProcs[] = {
    178         none_gradproc,
    179         color_gradproc,
    180         linear_gradproc,
    181         radial_gradproc,
    182         radial2_gradproc,
    183         sweep_gradproc,
    184         conical_gradproc,
    185     };
    186 
    187     for (size_t i = 0; i < SK_ARRAY_COUNT(gProcs); ++i) {
    188         gProcs[i](reporter, rec);
    189     }
    190 }
    191 
    192 DEF_TEST(Gradient, reporter) {
    193     TestGradientShaders(reporter);
    194     TestConstantGradient(reporter);
    195 }
    196