| // Copyright 2019 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "garnet/testing/views/color.h" |
| |
| #include <lib/fsl/vmo/vector.h> |
| #include <src/lib/fxl/logging.h> |
| #include <src/lib/fxl/strings/string_printf.h> |
| |
| namespace scenic { |
| |
| // RGBA hex dump |
| std::ostream& operator<<(std::ostream& os, const Color& c) { |
| return os << fxl::StringPrintf("%02X%02X%02X%02X", c.r, c.g, c.b, c.a); |
| } |
| |
| std::map<Color, size_t> Histogram( |
| const fuchsia::ui::scenic::ScreenshotData& screenshot) { |
| FXL_CHECK(screenshot.info.pixel_format == |
| fuchsia::images::PixelFormat::BGRA_8) |
| << "Non-BGRA_8 pixel formats not supported"; |
| |
| std::vector<uint8_t> data; |
| FXL_CHECK(fsl::VectorFromVmo(screenshot.data, &data)) |
| << "Failed to read screenshot"; |
| |
| std::map<Color, size_t> histogram; |
| |
| // https://en.wikipedia.org/wiki/Sword_Art_Online_Alternative_Gun_Gale_Online#Characters |
| const uint8_t* pchan = data.data(); |
| const size_t llenn = screenshot.info.width * screenshot.info.height; |
| for (uint32_t pixel = 0; pixel < llenn; pixel++) { |
| const Color* color = reinterpret_cast<const Color*>(pchan); |
| ++histogram[*color]; |
| pchan += 4; |
| } |
| |
| return histogram; |
| } |
| |
| } // namespace scenic |