63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
// Copyright (C) 2022 The Android Open Source Project
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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 "ImageUtils.h"
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#include <stb/stb_image.h>
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#include <stb/stb_image_write.h>
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#include <cstring>
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namespace gfxstream {
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bool LoadRGBAFromPng(const std::string& filename, uint32_t* outWidth, uint32_t* outHeight,
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std::vector<uint32_t>* outPixels) {
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*outWidth = 0;
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*outHeight = 0;
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outPixels->clear();
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int decodedWidth;
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int decodedHeight;
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int decodedChannels;
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unsigned char* decodedPixels =
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stbi_load(filename.c_str(), &decodedWidth, &decodedHeight, &decodedChannels,
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/*desiredChannels=*/4);
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if (decodedPixels == nullptr) {
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return false;
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}
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const std::size_t decodedSize = decodedWidth * decodedHeight;
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const std::size_t decodedSizeBytes = decodedSize * 4;
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*outWidth = static_cast<uint32_t>(decodedWidth);
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*outHeight = static_cast<uint32_t>(decodedHeight);
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outPixels->resize(decodedSize, 0);
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std::memcpy(outPixels->data(), decodedPixels, decodedSizeBytes);
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stbi_image_free(decodedPixels);
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return true;
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}
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bool SaveRGBAToPng(uint32_t width, uint32_t height, const uint32_t* pixels,
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const std::string& filename) {
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if (stbi_write_png(filename.c_str(), width, height,
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/*channels=*/4, pixels, width * 4) == 0) {
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return false;
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}
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return true;
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}
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} // namespace gfxstream
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