Consolidate read/write-Pixels testing code

Change-Id: I853f8f747ed0040333473fbc722cabac84e6ac83
Reviewed-on: https://skia-review.googlesource.com/7560
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>

1 files changed, 117 insertions, 0 deletions

diff --git a/tests/TestUtils.cpp b/tests/TestUtils.cpp
new file mode 100644
index 0000000000..61f4636f66
--- /dev/null
+++ b/tests/TestUtils.cpp
@@ -0,0 +1,117 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "TestUtils.h"
+
+#if SK_SUPPORT_GPU
+
+#include "GrSurfaceContext.h"
+#include "GrSurfaceProxy.h"
+
+void test_read_pixels(skiatest::Reporter* reporter, GrContext* context,
+                      GrSurfaceContext* srcContext, uint32_t expectedPixelValues[],
+                      const char* testName) {
+    int pixelCnt = srcContext->width() * srcContext->height();
+    SkAutoTMalloc<uint32_t> pixels(pixelCnt);
+    memset(pixels.get(), 0, sizeof(uint32_t)*pixelCnt);
+
+    SkImageInfo ii = SkImageInfo::Make(srcContext->width(), srcContext->height(),
+                                       kRGBA_8888_SkColorType, kPremul_SkAlphaType);
+    bool read = srcContext->readPixels(ii, pixels.get(), 0, 0, 0);
+    if (!read) {
+        ERRORF(reporter, "%s: Error reading from texture.", testName);
+    }
+
+    for (int i = 0; i < pixelCnt; ++i) {
+        if (pixels.get()[i] != expectedPixelValues[i]) {
+            ERRORF(reporter, "%s: Error, pixel value %d should be 0x%08x, got 0x%08x.",
+                   testName, i, expectedPixelValues[i], pixels.get()[i]);
+            break;
+        }
+    }
+}
+
+void test_write_pixels(skiatest::Reporter* reporter, GrContext* context,
+                       GrSurfaceContext* dstContext, bool expectedToWork,
+                       const char* testName) {
+    int pixelCnt = dstContext->width() * dstContext->height();
+    SkAutoTMalloc<uint32_t> pixels(pixelCnt);
+    for (int y = 0; y < dstContext->width(); ++y) {
+        for (int x = 0; x < dstContext->height(); ++x) {
+            pixels.get()[y * dstContext->width() + x] = GrColorPackRGBA(x, y, x + y, x * y);
+        }
+    }
+
+    SkImageInfo ii = SkImageInfo::Make(dstContext->width(), dstContext->height(),
+                                       kRGBA_8888_SkColorType, kPremul_SkAlphaType);
+    bool write = dstContext->writePixels(ii, pixels.get(), 0, 0, 0);
+    if (!write) {
+        if (expectedToWork) {
+            ERRORF(reporter, "%s: Error writing to texture.", testName);
+        }
+        return;
+    }
+
+    if (write && !expectedToWork) {
+        ERRORF(reporter, "%s: writePixels succeeded when it wasn't supposed to.", testName);
+        return;
+    }
+
+    test_read_pixels(reporter, context, dstContext, pixels.get(), testName);
+}
+
+void test_copy_from_surface(skiatest::Reporter* reporter, GrContext* context,
+                            GrSurfaceProxy* proxy, uint32_t expectedPixelValues[],
+                            bool onlyTestRTConfig, const char* testName) {
+    GrSurfaceDesc copyDstDesc;
+    copyDstDesc.fConfig = kRGBA_8888_GrPixelConfig;
+    copyDstDesc.fWidth = proxy->width();
+    copyDstDesc.fHeight = proxy->height();
+
+    for (auto flags : { kNone_GrSurfaceFlags, kRenderTarget_GrSurfaceFlag }) {
+        if (kNone_GrSurfaceFlags == flags && onlyTestRTConfig) {
+            continue;
+        }
+
+        copyDstDesc.fFlags = flags;
+
+        sk_sp<GrSurfaceContext> dstContext(GrSurfaceProxy::TestCopy(context, copyDstDesc, proxy));
+
+        test_read_pixels(reporter, context, dstContext.get(), expectedPixelValues, testName);
+    }
+}
+
+void test_copy_to_surface(skiatest::Reporter* reporter, GrContext* context,
+                          GrSurfaceContext* dstContext, const char* testName) {
+
+    int pixelCnt = dstContext->width() * dstContext->height();
+    SkAutoTMalloc<uint32_t> pixels(pixelCnt);
+    for (int y = 0; y < dstContext->width(); ++y) {
+        for (int x = 0; x < dstContext->height(); ++x) {
+            pixels.get()[y * dstContext->width() + x] = GrColorPackRGBA(y, x, x * y, x *+ y);
+        }
+    }
+
+    GrSurfaceDesc copySrcDesc;
+    copySrcDesc.fConfig = kRGBA_8888_GrPixelConfig;
+    copySrcDesc.fWidth = dstContext->width();
+    copySrcDesc.fHeight = dstContext->height();
+
+    for (auto flags : { kNone_GrSurfaceFlags, kRenderTarget_GrSurfaceFlag }) {
+        copySrcDesc.fFlags = flags;
+
+        sk_sp<GrSurfaceProxy> src(GrSurfaceProxy::MakeDeferred(*context->caps(),
+                                                               context->textureProvider(),
+                                                               copySrcDesc,
+                                                               SkBudgeted::kYes, pixels.get(), 0));
+        dstContext->copy(src.get());
+
+        test_read_pixels(reporter, context, dstContext, pixels.get(), testName);
+    }
+}
+
+#endif