Add framebuffer dump in PPM format (#227)

This CL plumbs through the ability to dump the framebuffer into a PPM image.

1 files changed, 94 insertions, 0 deletions

diff --git a/samples/ppm_test.cc b/samples/ppm_test.cc
new file mode 100644
index 0000000..9821455
--- /dev/null
+++ b/samples/ppm_test.cc
@@ -0,0 +1,94 @@
+// Copyright 2019 The Amber Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/ppm.h"
+
+#include <algorithm>
+#include <cstring>
+#include <utility>
+#include <vector>
+
+#include "amber/result.h"
+#include "gtest/gtest.h"
+#include "src/make_unique.h"
+
+namespace amber {
+namespace {
+
+const uint8_t kExpectedPPM[] = {
+    0x50, 0x36, 0x0a, 0x31, 0x32, 0x20, 0x36, 0x0a, 0x32, 0x35, 0x35, 0x0a,
+    0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00,
+    0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+    0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+    0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00,
+    0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+    0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+    0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00,
+    0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+    0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+    0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00,
+    0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+    0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+    0x00, 0xff, 0xff, 0x00, 0xff, 0xff, 0x00, 0xff, 0xff, 0x00, 0xff, 0xff,
+    0x00, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0x00, 0xff,
+    0xff, 0x00, 0xff, 0xff, 0x00, 0xff, 0xff, 0x00, 0xff, 0xff, 0x00, 0xff,
+    0x00, 0xff, 0xff, 0x00, 0xff, 0xff, 0x00, 0xff, 0xff, 0x00, 0xff, 0xff,
+    0x00, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0x00, 0xff,
+    0xff, 0x00, 0xff, 0xff, 0x00, 0xff, 0xff, 0x00, 0xff, 0xff, 0x00, 0xff};
+
+}  // namespace
+
+using PpmTest = testing::Test;
+
+TEST_F(PpmTest, ConvertToPPM) {
+  const uint32_t width = 12;
+  const uint32_t height = 6;
+
+  std::vector<amber::Value> data;
+
+  const uint32_t MaskRed = 0x000000FF;
+  const uint32_t MaskBlue = 0x0000FF00;
+  const uint32_t MaskAplha = 0xFF000000;
+
+  for (uint32_t y = 0; y < height; ++y) {
+    for (uint32_t x = 0; x < width; ++x) {
+      uint32_t pixel = MaskAplha;
+      if (x < width / 2) {
+        pixel |= MaskRed;
+      } else {
+        pixel |= MaskBlue;
+      }
+      if (y > height / 2) {
+        // invert colors
+        pixel = ~pixel;
+        // reset alpha to 1
+        pixel |= MaskAplha;
+      }
+      v.SetIntValue(static_cast<uint64_t>(pixel));
+      data.push_back(v);
+    }
+  }
+
+  amber::Result r;
+  std::string image;
+  std::tie(r, image) = ConvertToPPM(width, height, &data);
+
+  EXPECT_TRUE(r.IsSuccess());
+
+  // Compare
+  EXPECT_EQ(image.size(), sizeof(kExpectedPPM));
+  EXPECT_EQ(std::memcmp(image.c_str(), kExpectedPPM, sizeof(kExpectedPPM)), 0);
+}
+
+}  // namespace amber