ColorFilterTest.cpp revision 8f6884aab8aecd7657cf3f9cdbc682f0deca29c5
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 "SkColor.h" 9#include "SkColorFilter.h" 10#include "SkColorPriv.h" 11#include "SkLumaColorFilter.h" 12#include "SkOrderedReadBuffer.h" 13#include "SkOrderedWriteBuffer.h" 14#include "SkRandom.h" 15#include "SkXfermode.h" 16#include "Test.h" 17 18static SkColorFilter* reincarnate_colorfilter(SkFlattenable* obj) { 19 SkOrderedWriteBuffer wb; 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.readColorFilter(); 29} 30 31/////////////////////////////////////////////////////////////////////////////// 32 33#define ILLEGAL_MODE ((SkXfermode::Mode)-1) 34 35DEF_TEST(ColorFilter, reporter) { 36 SkRandom rand; 37 38 for (int mode = 0; mode <= SkXfermode::kLastMode; mode++) { 39 SkColor color = rand.nextU(); 40 41 // ensure we always get a filter, by avoiding the possibility of a 42 // special case that would return NULL (if color's alpha is 0 or 0xFF) 43 color = SkColorSetA(color, 0x7F); 44 45 SkColorFilter* cf = SkColorFilter::CreateModeFilter(color, 46 (SkXfermode::Mode)mode); 47 48 // allow for no filter if we're in Dst mode (its a no op) 49 if (SkXfermode::kDst_Mode == mode && NULL == cf) { 50 continue; 51 } 52 53 SkAutoUnref aur(cf); 54 REPORTER_ASSERT(reporter, cf); 55 56 SkColor c = ~color; 57 SkXfermode::Mode m = ILLEGAL_MODE; 58 59 SkColor expectedColor = color; 60 SkXfermode::Mode expectedMode = (SkXfermode::Mode)mode; 61 62// SkDebugf("--- mc [%d %x] ", mode, color); 63 64 REPORTER_ASSERT(reporter, cf->asColorMode(&c, &m)); 65 // handle special-case folding by the factory 66 if (SkXfermode::kClear_Mode == mode) { 67 if (c != expectedColor) { 68 expectedColor = 0; 69 } 70 if (m != expectedMode) { 71 expectedMode = SkXfermode::kSrc_Mode; 72 } 73 } 74 75// SkDebugf("--- got [%d %x] expected [%d %x]\n", m, c, expectedMode, expectedColor); 76 77 REPORTER_ASSERT(reporter, c == expectedColor); 78 REPORTER_ASSERT(reporter, m == expectedMode); 79 80 { 81 SkColorFilter* cf2 = reincarnate_colorfilter(cf); 82 SkAutoUnref aur2(cf2); 83 REPORTER_ASSERT(reporter, cf2); 84 85 SkColor c2 = ~color; 86 SkXfermode::Mode m2 = ILLEGAL_MODE; 87 REPORTER_ASSERT(reporter, cf2->asColorMode(&c2, &m2)); 88 REPORTER_ASSERT(reporter, c2 == expectedColor); 89 REPORTER_ASSERT(reporter, m2 == expectedMode); 90 } 91 } 92} 93 94/////////////////////////////////////////////////////////////////////////////// 95 96DEF_TEST(LumaColorFilter, reporter) { 97 SkPMColor in, out; 98 SkAutoTUnref<SkColorFilter> lf(SkLumaColorFilter::Create()); 99 100 // Applying luma to white produces black with the same transparency. 101 for (unsigned i = 0; i < 256; ++i) { 102 in = SkPackARGB32(i, i, i, i); 103 lf->filterSpan(&in, 1, &out); 104 REPORTER_ASSERT(reporter, SkGetPackedA32(out) == i); 105 REPORTER_ASSERT(reporter, SkGetPackedR32(out) == 0); 106 REPORTER_ASSERT(reporter, SkGetPackedG32(out) == 0); 107 REPORTER_ASSERT(reporter, SkGetPackedB32(out) == 0); 108 } 109 110 // Applying luma to black yields transparent black (luminance(black) == 0) 111 for (unsigned i = 0; i < 256; ++i) { 112 in = SkPackARGB32(i, 0, 0, 0); 113 lf->filterSpan(&in, 1, &out); 114 REPORTER_ASSERT(reporter, out == SK_ColorTRANSPARENT); 115 } 116 117 // For general colors, a luma filter generates black with an attenuated alpha channel. 118 for (unsigned i = 1; i < 256; ++i) { 119 in = SkPackARGB32(i, i, i / 2, i / 3); 120 lf->filterSpan(&in, 1, &out); 121 REPORTER_ASSERT(reporter, out != in); 122 REPORTER_ASSERT(reporter, SkGetPackedA32(out) <= i); 123 REPORTER_ASSERT(reporter, SkGetPackedR32(out) == 0); 124 REPORTER_ASSERT(reporter, SkGetPackedG32(out) == 0); 125 REPORTER_ASSERT(reporter, SkGetPackedB32(out) == 0); 126 } 127} 128