ColorFilterTest.cpp revision d494b09f554d470fc6411d0924879bbfb0cb0e95 
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 "SkColor.h"
10#include "SkColorPriv.h"
11#include "SkColorFilter.h"
12#include "SkLumaColorFilter.h"
13#include "SkRandom.h"
14#include "SkXfermode.h"
15#include "SkOrderedReadBuffer.h"
16#include "SkOrderedWriteBuffer.h"
17
18static SkFlattenable* reincarnate_flattenable(SkFlattenable* obj) {
19    SkOrderedWriteBuffer wb(1024);
20    wb.writeFlattenable(obj);
21
22    size_t size = wb.size();
23    SkAutoSMalloc<1024> storage(size);
24    // make a copy into storage
25    wb.writeToMemory(storage.get());
26
27    SkOrderedReadBuffer rb(storage.get(), size);
28    return rb.readFlattenable();
29}
30
31template <typename T> T* reincarnate(T* obj) {
32    return (T*)reincarnate_flattenable(obj);
33}
34
35///////////////////////////////////////////////////////////////////////////////
36
37#define ILLEGAL_MODE    ((SkXfermode::Mode)-1)
38
39static void test_asColorMode(skiatest::Reporter* reporter) {
40    SkRandom rand;
41
42    for (int mode = 0; mode <= SkXfermode::kLastMode; mode++) {
43        SkColor color = rand.nextU();
44
45        // ensure we always get a filter, by avoiding the possibility of a
46        // special case that would return NULL (if color's alpha is 0 or 0xFF)
47        color = SkColorSetA(color, 0x7F);
48
49        SkColorFilter* cf = SkColorFilter::CreateModeFilter(color,
50                                                        (SkXfermode::Mode)mode);
51
52        // allow for no filter if we're in Dst mode (its a no op)
53        if (SkXfermode::kDst_Mode == mode && NULL == cf) {
54            continue;
55        }
56
57        SkAutoUnref aur(cf);
58        REPORTER_ASSERT(reporter, cf);
59
60        SkColor c = ~color;
61        SkXfermode::Mode m = ILLEGAL_MODE;
62
63        SkColor expectedColor = color;
64        SkXfermode::Mode expectedMode = (SkXfermode::Mode)mode;
65
66//        SkDebugf("--- mc [%d %x] ", mode, color);
67
68        REPORTER_ASSERT(reporter, cf->asColorMode(&c, &m));
69        // handle special-case folding by the factory
70        if (SkXfermode::kClear_Mode == mode) {
71            if (c != expectedColor) {
72                expectedColor = 0;
73            }
74            if (m != expectedMode) {
75                expectedMode = SkXfermode::kSrc_Mode;
76            }
77        }
78
79//        SkDebugf("--- got [%d %x] expected [%d %x]\n", m, c, expectedMode, expectedColor);
80
81        REPORTER_ASSERT(reporter, c == expectedColor);
82        REPORTER_ASSERT(reporter, m == expectedMode);
83
84        {
85            SkColorFilter* cf2 = reincarnate(cf);
86            SkAutoUnref aur2(cf2);
87            REPORTER_ASSERT(reporter, cf2);
88
89            SkColor c2 = ~color;
90            SkXfermode::Mode m2 = ILLEGAL_MODE;
91            REPORTER_ASSERT(reporter, cf2->asColorMode(&c2, &m2));
92            REPORTER_ASSERT(reporter, c2 == expectedColor);
93            REPORTER_ASSERT(reporter, m2 == expectedMode);
94        }
95    }
96}
97
98///////////////////////////////////////////////////////////////////////////////
99
100static void test_lumaColorFilter(skiatest::Reporter* reporter) {
101    SkPMColor in, out;
102    SkAutoTUnref<SkColorFilter> lf(SkLumaColorFilter::Create());
103
104    // Applying luma to white produces black with the same transparency.
105    for (unsigned i = 0; i < 256; ++i) {
106        in = SkPackARGB32(i, i, i, i);
107        lf->filterSpan(&in, 1, &out);
108        REPORTER_ASSERT(reporter, SkGetPackedA32(out) == i);
109        REPORTER_ASSERT(reporter, SkGetPackedR32(out) == 0);
110        REPORTER_ASSERT(reporter, SkGetPackedG32(out) == 0);
111        REPORTER_ASSERT(reporter, SkGetPackedB32(out) == 0);
112    }
113
114    // Applying luma to black yields transparent black (luminance(black) == 0)
115    for (unsigned i = 0; i < 256; ++i) {
116        in = SkPackARGB32(i, 0, 0, 0);
117        lf->filterSpan(&in, 1, &out);
118        REPORTER_ASSERT(reporter, out == SK_ColorTRANSPARENT);
119    }
120
121    // For general colors, a luma filter generates black with an attenuated alpha channel.
122    for (unsigned i = 1; i < 256; ++i) {
123        in = SkPackARGB32(i, i, i / 2, i / 3);
124        lf->filterSpan(&in, 1, &out);
125        REPORTER_ASSERT(reporter, out != in);
126        REPORTER_ASSERT(reporter, SkGetPackedA32(out) <= i);
127        REPORTER_ASSERT(reporter, SkGetPackedR32(out) == 0);
128        REPORTER_ASSERT(reporter, SkGetPackedG32(out) == 0);
129        REPORTER_ASSERT(reporter, SkGetPackedB32(out) == 0);
130    }
131}
132
133#include "TestClassDef.h"
134DEFINE_TESTCLASS("ColorFilter", ColorFilterTestClass, test_asColorMode)
135DEFINE_TESTCLASS("LumaColorFilter", LumaColorFilterTestClass, test_lumaColorFilter)
136