GpuColorFilterTest.cpp revision 1530283c483cb88aa725bce50a6d193dd00ee570 
1
2/*
3 * Copyright 2013 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
9#include "SkColorFilter.h"
10#include "Test.h"
11
12#if SK_SUPPORT_GPU
13
14#include "GrContext.h"
15#include "GrFragmentProcessor.h"
16#include "GrInvariantOutput.h"
17#include "SkGr.h"
18
19static GrColor filterColor(const GrColor& color, uint32_t flags)  {
20    uint32_t mask = 0;
21    if (flags & kR_GrColorComponentFlag) {
22        mask = 0xFF << GrColor_SHIFT_R;
23    }
24    if (flags & kG_GrColorComponentFlag) {
25        mask |= 0xFF << GrColor_SHIFT_G;
26    }
27    if (flags & kB_GrColorComponentFlag) {
28        mask |= 0xFF << GrColor_SHIFT_B;
29    }
30    if (flags & kA_GrColorComponentFlag) {
31        mask |= 0xFF << GrColor_SHIFT_A;
32    }
33    return color & mask;
34}
35
36DEF_GPUTEST_FOR_ALL_CONTEXTS(GpuColorFilter, reporter, context) {
37    struct GetConstantComponentTestCase {
38        // "Shape drawn with"
39        uint32_t inputComponents; // "rgb of", "red of", "alpha of", ...
40        GrColor inputColor;       // "[color]"
41
42        SkColor filterColor;      // "with filter color [color]"
43        SkXfermode::Mode filterMode; // "in mode [mode]"
44
45        // "produces"
46        uint32_t outputComponents; // "rgb of", "red of", "alpha of", ...
47        GrColor outputColor;       // "[color]"
48    };
49
50    // Shorthands.
51    enum {
52        kR = kR_GrColorComponentFlag,
53        kG = kG_GrColorComponentFlag,
54        kB = kB_GrColorComponentFlag,
55        kA = kA_GrColorComponentFlag,
56        kRGB = kRGB_GrColorComponentFlags,
57        kRGBA = kRGBA_GrColorComponentFlags
58    };
59
60    // Note: below, SkColors are non-premultiplied, where as GrColors are premultiplied.
61
62    const SkColor c1 = SkColorSetARGB(200, 200, 200, 200);
63    const SkColor c2 = SkColorSetARGB(60, 60, 60, 60);
64    const GrColor gr_c1 = SkColorToPremulGrColor(c1);
65    const GrColor gr_c2 = SkColorToPremulGrColor(c2);
66
67    const GrColor gr_black = GrColorPackA4(0);
68    const GrColor gr_white = GrColorPackA4(255);
69    const GrColor gr_whiteTrans = GrColorPackA4(128);
70
71    GetConstantComponentTestCase filterTests[] = {
72        // A color filtered with Clear produces black.
73        { kRGBA, gr_white, SK_ColorBLACK, SkXfermode::kClear_Mode, kRGBA, gr_black },
74        { kRGBA, gr_c1,    SK_ColorWHITE, SkXfermode::kClear_Mode, kRGBA, gr_black },
75        { kR,    gr_white, c1,            SkXfermode::kClear_Mode, kRGBA, gr_black },
76
77        // A color filtered with a color in mode Src, produces the filter color.
78        { kRGBA, gr_c2, c1, SkXfermode::kSrc_Mode, kRGBA, gr_c1 },
79        { kA,    gr_c1, c1, SkXfermode::kSrc_Mode, kRGBA, gr_c1 },
80
81        // A color filtered with SrcOver produces a color.
82        { kRGBA, gr_whiteTrans, SkColorSetARGB(128, 200, 200, 200), SkXfermode::kSrcOver_Mode, kRGBA, GrColorPackRGBA(164, 164, 164, 192)},
83        // An unknown color with known alpha filtered with SrcOver produces an unknown color with known alpha.
84        { kA   , gr_whiteTrans, SkColorSetARGB(128, 200, 200, 200), SkXfermode::kSrcOver_Mode, kA   , GrColorPackRGBA(0, 0, 0, 192)},
85        // A color with unknown alpha filtered with SrcOver produces a color with unknown alpha.
86        { kRGB , gr_whiteTrans, SkColorSetARGB(128, 200, 200, 200), SkXfermode::kSrcOver_Mode, kRGB, GrColorPackRGBA(164, 164, 164, 0)},
87
88        // A color filtered with DstOver produces a color.
89        { kRGBA, gr_whiteTrans, SkColorSetARGB(128, 200, 200, 200), SkXfermode::kDstOver_Mode, kRGBA, GrColorPackRGBA(178, 178, 178, 192)},
90        // An unknown color with known alpha filtered with DstOver produces an unknown color with known alpha.
91        { kA   , gr_whiteTrans, SkColorSetARGB(128, 200, 200, 200), SkXfermode::kDstOver_Mode, kA   , GrColorPackRGBA(0, 0, 0, 192)},
92        // A color with unknown alpha filtered with DstOver produces an unknown color.
93        { kRGB , gr_whiteTrans, SkColorSetARGB(128, 200, 200, 200), SkXfermode::kDstOver_Mode, 0    , gr_black},
94
95        // An unknown color with known alpha and red component filtered with Multiply produces an unknown color with known red and alpha.
96        { kR|kA , gr_whiteTrans, SkColorSetARGB(128, 200, 200, 200), SkXfermode::kModulate_Mode, kR|kA, GrColorPackRGBA(50, 0, 0, 64) }
97    };
98
99    GrPaint paint;
100    for (size_t i = 0; i < SK_ARRAY_COUNT(filterTests); ++i) {
101        const GetConstantComponentTestCase& test = filterTests[i];
102        SkAutoTUnref<SkColorFilter> cf(
103            SkColorFilter::CreateModeFilter(test.filterColor, test.filterMode));
104        SkAutoTUnref<const GrFragmentProcessor> fp( cf->asFragmentProcessor(context));
105        REPORTER_ASSERT(reporter, fp);
106        GrInvariantOutput inout(test.inputColor,
107                                static_cast<GrColorComponentFlags>(test.inputComponents),
108                                false);
109        fp->computeInvariantOutput(&inout);
110        REPORTER_ASSERT(reporter, filterColor(inout.color(), inout.validFlags()) ==
111                                  test.outputColor);
112        REPORTER_ASSERT(reporter, test.outputComponents == inout.validFlags());
113    }
114}
115
116#endif
117