1 /*
2 * Copyright 2016 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 /*
9 * This is a straightforward test of using packed pixel configs (4444, 565).
10 * This test will make sure that these RGBA_4444 and RGB_565 are always supported
11 * as valid texturing configs.
12 */
13
14 #include "Test.h"
15
16 #if SK_SUPPORT_GPU
17 #include "GrContext.h"
18 #include "GrResourceProvider.h"
19 #include "GrTexture.h"
20
21 static const int DEV_W = 10, DEV_H = 10;
22 static const SkIRect DEV_RECT = SkIRect::MakeWH(DEV_W, DEV_H);
23 static const uint8_t TOL = 0x4;
24
check_component(skiatest::Reporter * reporter,uint8_t control,uint8_t test)25 static void check_component(skiatest::Reporter* reporter, uint8_t control, uint8_t test) {
26 uint8_t diff = 0;
27 if (control >= test) {
28 diff = control - test;
29 } else {
30 diff = test - control;
31 }
32 REPORTER_ASSERT(reporter, diff < TOL);
33 }
34
expand_value(uint8_t original,int sigBits)35 static uint8_t expand_value(uint8_t original, int sigBits) {
36 SkASSERT(sigBits >= 4);
37 uint8_t inSigBitShift = 8 - sigBits;
38 uint8_t duplBitShift = sigBits - inSigBitShift;
39 return (original << inSigBitShift) + (original >> duplBitShift);
40 }
41
check_4444(skiatest::Reporter * reporter,const SkTDArray<uint16_t> & controlData,const SkTDArray<uint32_t> & readBuffer)42 static void check_4444(skiatest::Reporter* reporter,
43 const SkTDArray<uint16_t>& controlData,
44 const SkTDArray<uint32_t>& readBuffer) {
45 for (int j = 0; j < DEV_H; ++j) {
46 for (int i = 0; i < DEV_W; ++i) {
47 uint16_t control = controlData[i + j * DEV_H];
48 uint32_t test = readBuffer[i + j * DEV_H];
49
50 // Test alpha component
51 uint8_t ctrlComp = expand_value(control & 0xF, 4);
52 uint8_t testComp = GrColorUnpackA(test);
53 check_component(reporter, ctrlComp, testComp);
54
55 // Test blue component
56 ctrlComp = expand_value((control >> 4) & 0xF, 4);
57 testComp = GrColorUnpackB(test);
58 check_component(reporter, ctrlComp, testComp);
59
60 // Test green component
61 ctrlComp = expand_value((control >> 8) & 0xF, 4);
62 testComp = GrColorUnpackG(test);
63 check_component(reporter, ctrlComp, testComp);
64
65 // Test red component
66 ctrlComp = expand_value((control >> 12) & 0xF, 4);
67 testComp = GrColorUnpackR(test);
68 check_component(reporter, ctrlComp, testComp);
69 }
70 }
71 }
72
check_565(skiatest::Reporter * reporter,const SkTDArray<uint16_t> & controlData,const SkTDArray<GrColor> & readBuffer)73 static void check_565(skiatest::Reporter* reporter,
74 const SkTDArray<uint16_t>& controlData,
75 const SkTDArray<GrColor>& readBuffer) {
76 for (int j = 0; j < DEV_H; ++j) {
77 for (int i = 0; i < DEV_W; ++i) {
78 uint16_t control = controlData[i + j * DEV_H];
79 GrColor test = readBuffer[i + j * DEV_H];
80 // Test blue component (5 bit control)
81 uint8_t ctrlComp = expand_value(control & 0x1F, 5);
82 uint8_t testComp = GrColorUnpackB(test);
83 check_component(reporter, ctrlComp, testComp);
84
85 // Test green component (6 bit control)
86 ctrlComp = expand_value((control >> 5) & 0x3F, 6);
87 testComp = GrColorUnpackG(test);
88 check_component(reporter, ctrlComp, testComp);
89
90 // Test red component (5 bit control)
91 ctrlComp = expand_value((control >> 11) & 0x1F, 5);
92 testComp = GrColorUnpackR(test);
93 check_component(reporter, ctrlComp, testComp);
94 }
95 }
96 }
97
98 template <typename T>
runTest(skiatest::Reporter * reporter,GrContext * context,T val1,T val2,int arraySize,GrPixelConfig config)99 void runTest(skiatest::Reporter* reporter, GrContext* context,
100 T val1, T val2, int arraySize, GrPixelConfig config) {
101 SkTDArray<T> controlPixelData;
102 // We will read back into an 8888 buffer since 565/4444 read backes aren't supported
103 SkTDArray<GrColor> readBuffer;
104 controlPixelData.setCount(arraySize);
105 readBuffer.setCount(arraySize);
106
107 for (int i = 0; i < arraySize; i += 2) {
108 controlPixelData[i] = val1;
109 controlPixelData[i + 1] = val2;
110 }
111
112 for (int origin = 0; origin < 2; ++origin) {
113 GrSurfaceDesc desc;
114 desc.fFlags = kNone_GrSurfaceFlags;
115 desc.fWidth = DEV_W;
116 desc.fHeight = DEV_H;
117 desc.fConfig = config;
118 desc.fOrigin = 0 == origin ?
119 kTopLeft_GrSurfaceOrigin : kBottomLeft_GrSurfaceOrigin;
120 sk_sp<GrTexture> fpTexture(context->resourceProvider()->createTexture(
121 desc, SkBudgeted::kNo, controlPixelData.begin(), 0));
122 SkASSERT(fpTexture);
123 fpTexture->readPixels(0, 0, DEV_W, DEV_H, kRGBA_8888_GrPixelConfig, readBuffer.begin(), 0);
124 if (kRGBA_4444_GrPixelConfig == config) {
125 check_4444(reporter, controlPixelData, readBuffer);
126 } else {
127 SkASSERT(kRGB_565_GrPixelConfig == config);
128 check_565(reporter, controlPixelData, readBuffer);
129 }
130 }
131 }
132
133 static const int CONTROL_ARRAY_SIZE = DEV_W * DEV_H;
134
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(RGBA4444TextureTest,reporter,ctxInfo)135 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(RGBA4444TextureTest, reporter, ctxInfo) {
136 runTest<uint16_t>(reporter, ctxInfo.grContext(), 0xFF00, 0xFA62,
137 CONTROL_ARRAY_SIZE, kRGBA_4444_GrPixelConfig);
138 }
139
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(RGB565TextureTest,reporter,ctxInfo)140 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(RGB565TextureTest, reporter, ctxInfo) {
141 runTest<uint16_t>(reporter, ctxInfo.grContext(), 0xFF00, 0xFA62,
142 CONTROL_ARRAY_SIZE, kRGB_565_GrPixelConfig);
143 }
144
145 #endif
146