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#if SK_SUPPORT_GPU
10
11#include "GrContext.h"
12#include "GrContextFactory.h"
13#include "GrProcessor.h"
14#include "SkColorFilter.h"
15#include "SkGr.h"
16#include "Test.h"
17
18static GrColor filterColor(const GrColor& color, uint32_t flags)  {
19    uint32_t mask = 0;
20    if (flags & kR_GrColorComponentFlag) {
21        mask = 0xFF << GrColor_SHIFT_R;
22    }
23    if (flags & kG_GrColorComponentFlag) {
24        mask |= 0xFF << GrColor_SHIFT_G;
25    }
26    if (flags & kB_GrColorComponentFlag) {
27        mask |= 0xFF << GrColor_SHIFT_B;
28    }
29    if (flags & kA_GrColorComponentFlag) {
30        mask |= 0xFF << GrColor_SHIFT_A;
31    }
32    return color & mask;
33}
34
35static void test_getConstantColorComponents(skiatest::Reporter* reporter, GrContext* grContext) {
36    struct GetConstantComponentTestCase {
37        // "Shape drawn with"
38        uint32_t inputComponents; // "rgb of", "red of", "alpha of", ...
39        GrColor inputColor;       // "[color]"
40
41        SkColor filterColor;      // "with filter color [color]"
42        SkXfermode::Mode filterMode; // "in mode [mode]"
43
44        // "produces"
45        uint32_t outputComponents; // "rgb of", "red of", "alpha of", ...
46        GrColor outputColor;       // "[color]"
47    };
48
49    // Shorthands.
50    enum {
51        kR = kR_GrColorComponentFlag,
52        kG = kG_GrColorComponentFlag,
53        kB = kB_GrColorComponentFlag,
54        kA = kA_GrColorComponentFlag,
55        kRGB = kRGB_GrColorComponentFlags,
56        kRGBA = kRGBA_GrColorComponentFlags
57    };
58
59    // Note: below, SkColors are non-premultiplied, where as GrColors are premultiplied.
60
61    const SkColor c1 = SkColorSetARGB(200, 200, 200, 200);
62    const SkColor c2 = SkColorSetARGB(60, 60, 60, 60);
63    const GrColor gr_c1 = SkColor2GrColor(c1);
64    const GrColor gr_c2 = SkColor2GrColor(c2);
65
66    const GrColor gr_black = GrColorPackRGBA(0, 0, 0, 0);
67    const GrColor gr_white = GrColorPackRGBA(255, 255, 255, 255);
68    const GrColor gr_whiteTrans = GrColorPackRGBA(128, 128, 128, 128);
69
70    GetConstantComponentTestCase filterTests[] = {
71        // A color filtered with Clear produces black.
72        { kRGBA, gr_white, SK_ColorBLACK, SkXfermode::kClear_Mode, kRGBA, gr_black },
73        { kRGBA, gr_c1,    SK_ColorWHITE, SkXfermode::kClear_Mode, kRGBA, gr_black },
74        { kR,    gr_white, c1,            SkXfermode::kClear_Mode, kRGBA, gr_black },
75
76        // A color filtered with a color in mode Src, produces the filter color.
77        { kRGBA, gr_c2, c1, SkXfermode::kSrc_Mode, kRGBA, gr_c1 },
78        { kA,    gr_c1, c1, SkXfermode::kSrc_Mode, kRGBA, gr_c1 },
79
80        // A color filtered with SrcOver produces a color.
81        { kRGBA, gr_whiteTrans, SkColorSetARGB(128, 200, 200, 200), SkXfermode::kSrcOver_Mode, kRGBA, GrColorPackRGBA(164, 164, 164, 192)},
82        // An unknown color with known alpha filtered with SrcOver produces an unknown color with known alpha.
83        { kA   , gr_whiteTrans, SkColorSetARGB(128, 200, 200, 200), SkXfermode::kSrcOver_Mode, kA   , GrColorPackRGBA(0, 0, 0, 192)},
84        // A color with unknown alpha filtered with SrcOver produces a color with unknown alpha.
85        { kRGB , gr_whiteTrans, SkColorSetARGB(128, 200, 200, 200), SkXfermode::kSrcOver_Mode, kRGB, GrColorPackRGBA(164, 164, 164, 0)},
86
87        // A color filtered with DstOver produces a color.
88        { kRGBA, gr_whiteTrans, SkColorSetARGB(128, 200, 200, 200), SkXfermode::kDstOver_Mode, kRGBA, GrColorPackRGBA(178, 178, 178, 192)},
89        // An unknown color with known alpha filtered with DstOver produces an unknown color with known alpha.
90        { kA   , gr_whiteTrans, SkColorSetARGB(128, 200, 200, 200), SkXfermode::kDstOver_Mode, kA   , GrColorPackRGBA(0, 0, 0, 192)},
91        // A color with unknown alpha filtered with DstOver produces an unknown color.
92        { kRGB , gr_whiteTrans, SkColorSetARGB(128, 200, 200, 200), SkXfermode::kDstOver_Mode, 0    , gr_black},
93
94        // An unknown color with known alpha and red component filtered with Multiply produces an unknown color with known red and alpha.
95        { kR|kA , gr_whiteTrans, SkColorSetARGB(128, 200, 200, 200), SkXfermode::kModulate_Mode, kR|kA, GrColorPackRGBA(50, 0, 0, 64) }
96    };
97
98    for (size_t i = 0; i < SK_ARRAY_COUNT(filterTests); ++i) {
99        const GetConstantComponentTestCase& test = filterTests[i];
100        SkAutoTUnref<SkColorFilter> cf(SkColorFilter::CreateModeFilter(test.filterColor, test.filterMode));
101        SkAutoTUnref<GrFragmentProcessor> effect(cf->asFragmentProcessor(grContext));
102        GrColor color = test.inputColor;
103        uint32_t components = test.inputComponents;
104        effect->getConstantColorComponents(&color, &components);
105
106        REPORTER_ASSERT(reporter, filterColor(color, components) == test.outputColor);
107        REPORTER_ASSERT(reporter, test.outputComponents == components);
108    }
109}
110
111DEF_GPUTEST(GpuColorFilter, reporter, factory) {
112    for (int type = 0; type < GrContextFactory::kLastGLContextType; ++type) {
113        GrContextFactory::GLContextType glType = static_cast<GrContextFactory::GLContextType>(type);
114
115        GrContext* grContext = factory->get(glType);
116        if (NULL == grContext) {
117            continue;
118        }
119
120        test_getConstantColorComponents(reporter, grContext);
121    }
122}
123
124#endif
125