🛠️🐜 Antkeeper superbuild with dependencies included
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85 lines
2.5 KiB
85 lines
2.5 KiB
#include <cstdio>
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#include <cstdlib>
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#include <vector>
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#define STB_IMAGE_IMPLEMENTATION
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#include "stb_image.h"
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#include "tinyexr.h"
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int main(int argc, char** argv)
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{
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if (argc < 3) {
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printf("Usage: ldr2exr input.[png|bmp|tga|jpg|...] output.exr\n");
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printf(" NOTE: Supported LDR image format = stb_image can load.\n");
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printf(" NOTE: Input pixel value [0, 255] is mapped to [0.0, 1.0] in output EXR file.\n");
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printf(" NOTE: Only supports RGB pixel format.\n");
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exit(-1);
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}
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int width, height;
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int n;
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unsigned char *rgb = stbi_load(argv[1], &width, &height, &n, 0);
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if (!rgb || n != 3) {
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return -1;
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}
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EXRHeader header;
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InitEXRHeader(&header);
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EXRImage image;
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InitEXRImage(&image);
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image.num_channels = 3;
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std::vector<float> images[3];
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images[0].resize(width * height);
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images[1].resize(width * height);
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images[2].resize(width * height);
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for (int i = 0; i < width * height; i++) {
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images[0][i] = rgb[3*i+0] / 255.0f;
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images[1][i] = rgb[3*i+1] / 255.0f;
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images[2][i] = rgb[3*i+2] / 255.0f;
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}
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float* image_ptr[3];
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image_ptr[0] = &(images[2].at(0)); // B
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image_ptr[1] = &(images[1].at(0)); // G
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image_ptr[2] = &(images[0].at(0)); // R
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image.images = (unsigned char**)image_ptr;
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image.width = width;
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image.height = height;
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header.num_channels = 3;
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header.channels = (EXRChannelInfo *)malloc(sizeof(EXRChannelInfo) * header.num_channels);
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// Must be BGR(A) order, since most of EXR viewers expect this channel order.
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strncpy(header.channels[0].name, "B", 255); header.channels[0].name[strlen("B")] = '\0';
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strncpy(header.channels[1].name, "G", 255); header.channels[1].name[strlen("G")] = '\0';
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strncpy(header.channels[2].name, "R", 255); header.channels[2].name[strlen("R")] = '\0';
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header.pixel_types = (int *)malloc(sizeof(int) * header.num_channels);
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header.requested_pixel_types = (int *)malloc(sizeof(int) * header.num_channels);
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for (int i = 0; i < header.num_channels; i++) {
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header.pixel_types[i] = TINYEXR_PIXELTYPE_FLOAT; // pixel type of input image
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header.requested_pixel_types[i] = TINYEXR_PIXELTYPE_HALF; // pixel type of output image to be stored in .EXR
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}
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const char* err;
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int ret = SaveEXRImageToFile(&image, &header, argv[2], &err);
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if (ret != TINYEXR_SUCCESS) {
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fprintf(stderr, "Save EXR err: %s\n", err);
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return ret;
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}
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printf("Saved exr file. [ %s ] \n", argv[2]);
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free(rgb);
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free(header.channels);
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free(header.pixel_types);
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free(header.requested_pixel_types);
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return 0;
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}
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