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104 lines
2.9 KiB
104 lines
2.9 KiB
// Copyright 2019 The Amber Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "samples/png.h"
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#include <cassert>
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#include "amber/result.h"
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#include "amber/value.h"
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wweak-vtables"
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#include "third_party/lodepng/lodepng.h"
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#pragma clang diagnostic pop
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namespace png {
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namespace {
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unsigned char byte0(uint32_t word) {
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return static_cast<unsigned char>(word);
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}
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unsigned char byte1(uint32_t word) {
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return static_cast<unsigned char>(word >> 8);
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}
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unsigned char byte2(uint32_t word) {
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return static_cast<unsigned char>(word >> 16);
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}
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unsigned char byte3(uint32_t word) {
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return static_cast<unsigned char>(word >> 24);
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}
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} // namespace
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amber::Result ConvertToPNG(uint32_t width,
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uint32_t height,
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const std::vector<amber::Value>& values,
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std::vector<uint8_t>* buffer) {
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assert(values.size() == (width * height) &&
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"Buffer values != width * height");
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assert(!values.empty() && "Buffer empty");
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std::vector<uint8_t> data;
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// Prepare data as lodepng expects it
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for (const amber::Value& value : values) {
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const uint32_t pixel = value.AsUint32();
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data.push_back(byte2(pixel)); // R
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data.push_back(byte1(pixel)); // G
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data.push_back(byte0(pixel)); // B
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data.push_back(byte3(pixel)); // A
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}
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lodepng::State state;
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// Force RGBA color type, otherwise many PNG decoders will ignore the alpha
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// channel.
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state.encoder.auto_convert = 0;
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state.info_raw.colortype = LodePNGColorType::LCT_RGBA;
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state.info_raw.bitdepth = 8;
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state.info_png.color.colortype = LodePNGColorType::LCT_RGBA;
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state.info_png.color.bitdepth = 8;
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if (lodepng::encode(*buffer, data, width, height, state) != 0)
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return amber::Result("lodepng::encode() returned non-zero");
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return {};
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}
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amber::Result LoadPNG(const std::string file_name,
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uint32_t* width,
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uint32_t* height,
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std::vector<amber::Value>* values) {
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std::vector<uint8_t> decoded_buffer;
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if (lodepng::decode(decoded_buffer, *width, *height, file_name,
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LodePNGColorType::LCT_RGBA, 8) != 0) {
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return amber::Result("lodepng::decode() returned non-zero");
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}
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for (auto d : decoded_buffer) {
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amber::Value v;
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v.SetIntValue(d);
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values->push_back(v);
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}
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return {};
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}
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} // namespace png
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