1 /*
2 * Copyright 2012 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 "Test.h"
9
10 // This test is specific to the GPU backend.
11 #if SK_SUPPORT_GPU
12
13 #include "GrContext.h"
14 #include "GrContextPriv.h"
15 #include "GrResourceProvider.h"
16 #include "GrSurfaceContext.h"
17 #include "GrSurfaceProxy.h"
18 #include "GrTextureProxy.h"
19 #include "SkCanvas.h"
20 #include "SkSurface.h"
21
22 // This was made indivisible by 4 to ensure we test setting GL_PACK_ALIGNMENT properly.
23 static const int X_SIZE = 13;
24 static const int Y_SIZE = 13;
25
validate_alpha_data(skiatest::Reporter * reporter,int w,int h,const uint8_t * actual,size_t actualRowBytes,const uint8_t * expected,SkString extraMsg)26 static void validate_alpha_data(skiatest::Reporter* reporter, int w, int h, const uint8_t* actual,
27 size_t actualRowBytes, const uint8_t* expected, SkString extraMsg) {
28 for (int y = 0; y < h; ++y) {
29 for (int x = 0; x < w; ++x) {
30 uint8_t a = actual[y * actualRowBytes + x];
31 uint8_t e = expected[y * w + x];
32 if (e != a) {
33 ERRORF(reporter,
34 "Failed alpha readback. Expected: 0x%02x, Got: 0x%02x at (%d,%d), %s",
35 e, a, x, y, extraMsg.c_str());
36 return;
37 }
38 }
39 }
40 }
41
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ReadWriteAlpha,reporter,ctxInfo)42 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ReadWriteAlpha, reporter, ctxInfo) {
43 GrContext* context = ctxInfo.grContext();
44 unsigned char alphaData[X_SIZE * Y_SIZE];
45
46 static const int kClearValue = 0x2;
47
48 bool match;
49 static const size_t kRowBytes[] = {0, X_SIZE, X_SIZE + 1, 2 * X_SIZE - 1};
50 {
51 GrSurfaceDesc desc;
52 desc.fFlags = kNone_GrSurfaceFlags;
53 desc.fConfig = kAlpha_8_GrPixelConfig; // it is a single channel texture
54 desc.fWidth = X_SIZE;
55 desc.fHeight = Y_SIZE;
56
57 // We are initializing the texture with zeros here
58 memset(alphaData, 0, X_SIZE * Y_SIZE);
59
60 sk_sp<GrTextureProxy> proxy(GrSurfaceProxy::MakeDeferred(context->resourceProvider(),
61 desc,
62 SkBudgeted::kNo,
63 alphaData, 0));
64 if (!proxy) {
65 ERRORF(reporter, "Could not create alpha texture.");
66 return;
67 }
68 sk_sp<GrSurfaceContext> sContext(context->contextPriv().makeWrappedSurfaceContext(
69 std::move(proxy), nullptr));
70
71 const SkImageInfo ii = SkImageInfo::MakeA8(X_SIZE, Y_SIZE);
72 sk_sp<SkSurface> surf(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, ii));
73
74 // create a distinctive texture
75 for (int y = 0; y < Y_SIZE; ++y) {
76 for (int x = 0; x < X_SIZE; ++x) {
77 alphaData[y * X_SIZE + x] = y*X_SIZE+x;
78 }
79 }
80
81 for (auto rowBytes : kRowBytes) {
82
83 // upload the texture (do per-rowbytes iteration because we may overwrite below).
84 bool result = sContext->writePixels(ii, alphaData, 0, 0, 0);
85 REPORTER_ASSERT_MESSAGE(reporter, result, "Initial A8 writePixels failed");
86
87 size_t nonZeroRowBytes = rowBytes ? rowBytes : X_SIZE;
88 std::unique_ptr<uint8_t[]> readback(new uint8_t[nonZeroRowBytes * Y_SIZE]);
89 // clear readback to something non-zero so we can detect readback failures
90 memset(readback.get(), kClearValue, nonZeroRowBytes * Y_SIZE);
91
92 // read the texture back
93 result = sContext->readPixels(ii, readback.get(), rowBytes, 0, 0);
94 REPORTER_ASSERT_MESSAGE(reporter, result, "Initial A8 readPixels failed");
95
96 // make sure the original & read back versions match
97 SkString msg;
98 msg.printf("rb:%d A8", SkToU32(rowBytes));
99 validate_alpha_data(reporter, X_SIZE, Y_SIZE, readback.get(), nonZeroRowBytes,
100 alphaData, msg);
101
102 // Now try writing to a single channel surface (if we could create one).
103 if (surf) {
104 SkCanvas* canvas = surf->getCanvas();
105
106 SkPaint paint;
107
108 const SkRect rect = SkRect::MakeLTRB(-10, -10, X_SIZE + 10, Y_SIZE + 10);
109
110 paint.setColor(SK_ColorWHITE);
111
112 canvas->drawRect(rect, paint);
113
114 memset(readback.get(), kClearValue, nonZeroRowBytes * Y_SIZE);
115 result = surf->readPixels(ii, readback.get(), nonZeroRowBytes, 0, 0);
116 REPORTER_ASSERT_MESSAGE(reporter, result, "A8 readPixels after clear failed");
117
118 match = true;
119 for (int y = 0; y < Y_SIZE && match; ++y) {
120 for (int x = 0; x < X_SIZE && match; ++x) {
121 uint8_t rbValue = readback.get()[y * nonZeroRowBytes + x];
122 if (0xFF != rbValue) {
123 ERRORF(reporter,
124 "Failed alpha readback after clear. Expected: 0xFF, Got: 0x%02x"
125 " at (%d,%d), rb:%d", rbValue, x, y, SkToU32(rowBytes));
126 match = false;
127 }
128 }
129 }
130 }
131 }
132 }
133
134 static const GrPixelConfig kRGBAConfigs[] {
135 kRGBA_8888_GrPixelConfig,
136 kBGRA_8888_GrPixelConfig,
137 kSRGBA_8888_GrPixelConfig
138 };
139
140 for (int y = 0; y < Y_SIZE; ++y) {
141 for (int x = 0; x < X_SIZE; ++x) {
142 alphaData[y * X_SIZE + x] = y*X_SIZE+x;
143 }
144 }
145
146 const SkImageInfo dstInfo = SkImageInfo::Make(X_SIZE, Y_SIZE,
147 kAlpha_8_SkColorType,
148 kPremul_SkAlphaType);
149
150 // Attempt to read back just alpha from a RGBA/BGRA texture. Once with a texture-only src and
151 // once with a render target.
152 for (auto config : kRGBAConfigs) {
153 for (int rt = 0; rt < 2; ++rt) {
154 GrSurfaceDesc desc;
155 desc.fFlags = rt ? kRenderTarget_GrSurfaceFlag : kNone_GrSurfaceFlags;
156 desc.fConfig = config;
157 desc.fWidth = X_SIZE;
158 desc.fHeight = Y_SIZE;
159
160 uint32_t rgbaData[X_SIZE * Y_SIZE];
161 // Make the alpha channel of the rgba texture come from alphaData.
162 for (int y = 0; y < Y_SIZE; ++y) {
163 for (int x = 0; x < X_SIZE; ++x) {
164 rgbaData[y * X_SIZE + x] = GrColorPackRGBA(6, 7, 8, alphaData[y * X_SIZE + x]);
165 }
166 }
167 sk_sp<GrTextureProxy> proxy =
168 GrSurfaceProxy::MakeDeferred(context->resourceProvider(), desc, SkBudgeted::kNo,
169 rgbaData, 0);
170 if (!proxy) {
171 // We always expect to be able to create a RGBA texture
172 if (!rt && kRGBA_8888_GrPixelConfig == desc.fConfig) {
173 ERRORF(reporter, "Failed to create RGBA texture.");
174 }
175 continue;
176 }
177
178 sk_sp<GrSurfaceContext> sContext = context->contextPriv().makeWrappedSurfaceContext(
179 std::move(proxy), nullptr);
180
181 for (auto rowBytes : kRowBytes) {
182 size_t nonZeroRowBytes = rowBytes ? rowBytes : X_SIZE;
183
184 std::unique_ptr<uint8_t[]> readback(new uint8_t[nonZeroRowBytes * Y_SIZE]);
185 // Clear so we don't accidentally see values from previous iteration.
186 memset(readback.get(), kClearValue, nonZeroRowBytes * Y_SIZE);
187
188 // read the texture back
189 bool result = sContext->readPixels(dstInfo, readback.get(), rowBytes, 0, 0);
190 REPORTER_ASSERT_MESSAGE(reporter, result, "8888 readPixels failed");
191
192 // make sure the original & read back versions match
193 SkString msg;
194 msg.printf("rt:%d, rb:%d 8888", rt, SkToU32(rowBytes));
195 validate_alpha_data(reporter, X_SIZE, Y_SIZE, readback.get(), nonZeroRowBytes,
196 alphaData, msg);
197 }
198 }
199 }
200 }
201
202 #endif
203