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 #include "GrContext.h"
12 #include "GrContextPriv.h"
13 #include "GrProxyProvider.h"
14 #include "GrResourceProvider.h"
15 #include "GrSurfaceContext.h"
16 #include "GrSurfaceProxy.h"
17 #include "GrTextureProxy.h"
18 #include "ProxyUtils.h"
19 #include "SkCanvas.h"
20 #include "SkSurface.h"
21 #include "SkTo.h"
22
23 // This was made indivisible by 4 to ensure we test setting GL_PACK_ALIGNMENT properly.
24 static const int X_SIZE = 13;
25 static const int Y_SIZE = 13;
26
validate_alpha_data(skiatest::Reporter * reporter,int w,int h,const uint8_t * actual,size_t actualRowBytes,const uint8_t * expected,SkString extraMsg,GrColorType colorType)27 static void validate_alpha_data(skiatest::Reporter* reporter, int w, int h, const uint8_t* actual,
28 size_t actualRowBytes, const uint8_t* expected, SkString extraMsg,
29 GrColorType colorType) {
30 for (int y = 0; y < h; ++y) {
31 for (int x = 0; x < w; ++x) {
32 uint8_t a = actual[y * actualRowBytes + x];
33 uint8_t e = expected[y * w + x];
34 if (GrColorType::kRGBA_1010102 == colorType) {
35 // This config only preserves two bits of alpha
36 a >>= 6;
37 e >>= 6;
38 }
39 if (e != a) {
40 ERRORF(reporter,
41 "Failed alpha readback. Expected: 0x%02x, Got: 0x%02x at (%d,%d), %s",
42 e, a, x, y, extraMsg.c_str());
43 return;
44 }
45 }
46 }
47 }
48
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ReadWriteAlpha,reporter,ctxInfo)49 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ReadWriteAlpha, reporter, ctxInfo) {
50 GrContext* context = ctxInfo.grContext();
51 GrProxyProvider* proxyProvider = context->contextPriv().proxyProvider();
52
53 unsigned char alphaData[X_SIZE * Y_SIZE];
54
55 static const int kClearValue = 0x2;
56
57 bool match;
58 static const size_t kRowBytes[] = {0, X_SIZE, X_SIZE + 1, 2 * X_SIZE - 1};
59 {
60 GrSurfaceDesc desc;
61 desc.fFlags = kNone_GrSurfaceFlags;
62 desc.fConfig = kAlpha_8_GrPixelConfig; // it is a single channel texture
63 desc.fWidth = X_SIZE;
64 desc.fHeight = Y_SIZE;
65
66 // We are initializing the texture with zeros here
67 memset(alphaData, 0, X_SIZE * Y_SIZE);
68
69 const SkImageInfo ii = SkImageInfo::MakeA8(X_SIZE, Y_SIZE);
70
71 SkPixmap pixmap(ii, alphaData, ii.minRowBytes());
72 sk_sp<SkImage> alphaImg = SkImage::MakeRasterCopy(pixmap);
73 sk_sp<GrTextureProxy> proxy =
74 proxyProvider->createTextureProxy(alphaImg, kNone_GrSurfaceFlags, 1,
75 SkBudgeted::kNo, SkBackingFit::kExact);
76 if (!proxy) {
77 ERRORF(reporter, "Could not create alpha texture.");
78 return;
79 }
80 sk_sp<GrSurfaceContext> sContext(context->contextPriv().makeWrappedSurfaceContext(
81 std::move(proxy)));
82
83 sk_sp<SkSurface> surf(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, ii));
84
85 // create a distinctive texture
86 for (int y = 0; y < Y_SIZE; ++y) {
87 for (int x = 0; x < X_SIZE; ++x) {
88 alphaData[y * X_SIZE + x] = y*X_SIZE+x;
89 }
90 }
91
92 for (auto rowBytes : kRowBytes) {
93
94 // upload the texture (do per-rowbytes iteration because we may overwrite below).
95 bool result = sContext->writePixels(ii, alphaData, 0, 0, 0);
96 REPORTER_ASSERT(reporter, result, "Initial A8 writePixels failed");
97
98 size_t nonZeroRowBytes = rowBytes ? rowBytes : X_SIZE;
99 size_t bufLen = nonZeroRowBytes * Y_SIZE;
100 std::unique_ptr<uint8_t[]> readback(new uint8_t[bufLen]);
101 // clear readback to something non-zero so we can detect readback failures
102 memset(readback.get(), kClearValue, bufLen);
103
104 // read the texture back
105 result = sContext->readPixels(ii, readback.get(), rowBytes, 0, 0);
106 // We don't require reading from kAlpha_8 to be supported. TODO: At least make this work
107 // when kAlpha_8 is renderable.
108 if (!result) {
109 continue;
110 }
111 REPORTER_ASSERT(reporter, result, "Initial A8 readPixels failed");
112
113 // make sure the original & read back versions match
114 SkString msg;
115 msg.printf("rb:%d A8", SkToU32(rowBytes));
116 validate_alpha_data(reporter, X_SIZE, Y_SIZE, readback.get(), nonZeroRowBytes,
117 alphaData, msg, GrColorType::kAlpha_8);
118
119 // Now try writing to a single channel surface (if we could create one).
120 if (surf) {
121 SkCanvas* canvas = surf->getCanvas();
122
123 SkPaint paint;
124
125 const SkRect rect = SkRect::MakeLTRB(-10, -10, X_SIZE + 10, Y_SIZE + 10);
126
127 paint.setColor(SK_ColorWHITE);
128
129 canvas->drawRect(rect, paint);
130
131 // Workaround for a bug in old GCC/glibc used in our Chromecast toolchain:
132 // error: call to '__warn_memset_zero_len' declared with attribute warning:
133 // memset used with constant zero length parameter; this could be due
134 // to transposed parameters
135 // See also: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61294
136 if (bufLen > 0) {
137 memset(readback.get(), kClearValue, bufLen);
138 }
139 result = surf->readPixels(ii, readback.get(), nonZeroRowBytes, 0, 0);
140 REPORTER_ASSERT(reporter, result, "A8 readPixels after clear failed");
141
142 match = true;
143 for (int y = 0; y < Y_SIZE && match; ++y) {
144 for (int x = 0; x < X_SIZE && match; ++x) {
145 uint8_t rbValue = readback.get()[y * nonZeroRowBytes + x];
146 if (0xFF != rbValue) {
147 ERRORF(reporter,
148 "Failed alpha readback after clear. Expected: 0xFF, Got: 0x%02x"
149 " at (%d,%d), rb:%d", rbValue, x, y, SkToU32(rowBytes));
150 match = false;
151 }
152 }
153 }
154 }
155 }
156 }
157
158 static constexpr struct {
159 GrColorType fColorType;
160 GrSRGBEncoded fSRGBEncoded;
161 } kInfos[] = {
162 {GrColorType::kRGBA_8888, GrSRGBEncoded::kNo},
163 {GrColorType::kBGRA_8888, GrSRGBEncoded::kNo},
164 {GrColorType::kRGBA_8888, GrSRGBEncoded::kYes},
165 {GrColorType::kRGBA_1010102, GrSRGBEncoded::kNo},
166 };
167
168 for (int y = 0; y < Y_SIZE; ++y) {
169 for (int x = 0; x < X_SIZE; ++x) {
170 alphaData[y * X_SIZE + x] = y*X_SIZE+x;
171 }
172 }
173
174 const SkImageInfo dstInfo = SkImageInfo::Make(X_SIZE, Y_SIZE,
175 kAlpha_8_SkColorType,
176 kPremul_SkAlphaType);
177
178 // Attempt to read back just alpha from a RGBA/BGRA texture. Once with a texture-only src and
179 // once with a render target.
180 for (auto info : kInfos) {
181 for (int rt = 0; rt < 2; ++rt) {
182 uint32_t rgbaData[X_SIZE * Y_SIZE];
183 // Make the alpha channel of the rgba texture come from alphaData.
184 for (int y = 0; y < Y_SIZE; ++y) {
185 for (int x = 0; x < X_SIZE; ++x) {
186 rgbaData[y * X_SIZE + x] = GrColorPackRGBA(6, 7, 8, alphaData[y * X_SIZE + x]);
187 }
188 }
189
190 auto origin = rt ? kBottomLeft_GrSurfaceOrigin : kTopLeft_GrSurfaceOrigin;
191 auto proxy = sk_gpu_test::MakeTextureProxyFromData(context, rt, X_SIZE, Y_SIZE,
192 info.fColorType, info.fSRGBEncoded,
193 origin, rgbaData, 0);
194 if (!proxy) {
195 continue;
196 }
197
198 sk_sp<GrSurfaceContext> sContext = context->contextPriv().makeWrappedSurfaceContext(
199 std::move(proxy));
200
201 for (auto rowBytes : kRowBytes) {
202 size_t nonZeroRowBytes = rowBytes ? rowBytes : X_SIZE;
203
204 std::unique_ptr<uint8_t[]> readback(new uint8_t[nonZeroRowBytes * Y_SIZE]);
205 // Clear so we don't accidentally see values from previous iteration.
206 memset(readback.get(), kClearValue, nonZeroRowBytes * Y_SIZE);
207
208 // read the texture back
209 bool result = sContext->readPixels(dstInfo, readback.get(), rowBytes, 0, 0);
210 REPORTER_ASSERT(reporter, result, "8888 readPixels failed");
211
212 // make sure the original & read back versions match
213 SkString msg;
214 msg.printf("rt:%d, rb:%d 8888", rt, SkToU32(rowBytes));
215 validate_alpha_data(reporter, X_SIZE, Y_SIZE, readback.get(), nonZeroRowBytes,
216 alphaData, msg, info.fColorType);
217 }
218 }
219 }
220 }
221