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author | Hugues Evrard <hevrard@users.noreply.github.com> | 2019-01-28 17:06:16 +0000 |
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committer | dan sinclair <dj2@everburning.com> | 2019-01-28 12:06:16 -0500 |
commit | 970ba7a99eba1cd8d8a1ea10e4525db8b93fd284 (patch) | |
tree | e721902a817418e544d52eeb3cd7385ea214dd31 /samples/ppm.cc | |
parent | bca10fbe5f6fe21cae4c8cca0ccf0d07719c8670 (diff) | |
download | amber-970ba7a99eba1cd8d8a1ea10e4525db8b93fd284.tar.gz |
Add framebuffer dump in PPM format (#227)
This CL plumbs through the ability to dump the framebuffer into a PPM image.
Diffstat (limited to 'samples/ppm.cc')
-rw-r--r-- | samples/ppm.cc | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/samples/ppm.cc b/samples/ppm.cc new file mode 100644 index 0000000..5602118 --- /dev/null +++ b/samples/ppm.cc @@ -0,0 +1,65 @@ +// 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 "samples/ppm.h" + +#include <cassert> + +#include "amber/result.h" +#include "amber/value.h" + +namespace ppm { + +namespace { + +char byte0(uint32_t word) { + return static_cast<char>(word); +} + +char byte1(uint32_t word) { + return static_cast<char>(word >> 8); +} + +char byte2(uint32_t word) { + return static_cast<char>(word >> 16); +} + +} // namespace + +std::pair<amber::Result, std::string> ConvertToPPM( + uint32_t width, + uint32_t height, + const std::vector<amber::Value>& values) { + assert(values.size() == width * height); + + // Write PPM header + const uint32_t maximum_color_value = 255; + std::string image = "P6\n"; + image += std::to_string(width) + " " + std::to_string(height) + "\n"; + image += std::to_string(maximum_color_value) + "\n"; + + // Write PPM data + for (amber::Value value : values) { + const uint32_t pixel = value.AsUint32(); + // We assume R8G8B8A8_UINT here: + image.push_back(byte0(pixel)); // R + image.push_back(byte1(pixel)); // G + image.push_back(byte2(pixel)); // B + // PPM does not support alpha channel + } + + return std::make_pair(amber::Result(), image); +} + +} // namespace ppm |