mirror of
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122 lines
3.4 KiB
C++
122 lines
3.4 KiB
C++
// Copyright 2020 Google LLC
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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 <cassert>
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#include <filesystem>
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#include <iostream>
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#include "../lodepng/lodepng.h"
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void generate_one_step(const std::string &images_path) {
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constexpr unsigned int width = 512, height = 512,
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img_len = width * height * 4;
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std::vector<unsigned char> image(img_len);
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for (int y = 0; y < height; ++y) {
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for (int x = 0; x < width; ++x) {
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image[4 * width * y + 4 * x + 0] = 255 * !(x & y);
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image[4 * width * y + 4 * x + 1] = x ^ y;
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image[4 * width * y + 4 * x + 2] = x | y;
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image[4 * width * y + 4 * x + 3] = 255;
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}
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}
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// encode the image
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const std::string filename = images_path + "/out_generated1.png";
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unsigned int result =
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lodepng_encode32_file(filename.c_str(), image.data(), width, height);
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assert(!result);
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// after the image has been encoded, decode it to check that the
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// pixel values are the same
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unsigned int width2, height2;
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unsigned char *image2 = 0;
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result = lodepng_decode32_file(&image2, &width2, &height2, filename.c_str());
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assert(!result);
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assert(width2 == width);
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assert(height2 == height);
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// now, we can compare the values
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for (size_t i = 0; i < img_len; ++i) {
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assert(image2[i] == image[i]);
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}
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}
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void generate_two_steps(const std::string &images_path) {
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// generate the values
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constexpr unsigned int width = 512, height = 512,
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img_len = width * height * 4;
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std::vector<unsigned char> image(img_len);
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for (int y = 0; y < height; ++y) {
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for (int x = 0; x < width; ++x) {
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image[4 * width * y + 4 * x + 0] = 255 * !(x & y);
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image[4 * width * y + 4 * x + 1] = x ^ y;
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image[4 * width * y + 4 * x + 2] = x | y;
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image[4 * width * y + 4 * x + 3] = 255;
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}
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}
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// encode the image into memory first
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const std::string filename = images_path + "/out_generated2.png";
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unsigned char *png;
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size_t pngsize;
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unsigned int result =
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lodepng_encode32(&png, &pngsize, image.data(), width, height);
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assert(!result);
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// write the image into the file (from memory)
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result = lodepng_save_file(png, pngsize, filename.c_str());
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assert(!result);
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// now, decode the image using the 2 steps in order to compare the values
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unsigned int width2, height2;
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unsigned char *png2;
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size_t pngsize2;
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// load the file in memory
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result = lodepng_load_file(&png2, &pngsize2, filename.c_str());
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assert(!result);
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assert(pngsize == pngsize2);
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unsigned char *image2;
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result = lodepng_decode32(&image2, &width2, &height2, png2, pngsize2);
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assert(!result);
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assert(width2 == width);
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assert(height2 == height);
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// compare values
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for (size_t i = 0; i < img_len; ++i) {
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assert(image2[i] == image[i]);
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}
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}
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int main(int argc, char *argv[]) {
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const std::string images_path = std::filesystem::current_path().string();
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generate_one_step(images_path);
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generate_two_steps(images_path);
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return EXIT_SUCCESS;
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} |