🛠️🐜 Antkeeper superbuild with dependencies included
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132 lines
4.0 KiB
132 lines
4.0 KiB
// https://gist.github.com/mmp/21ea8ac6d7f682b6252b
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#include "tinyexr/tinyexr.h"
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#include "tinyexr/tinyexr.cc"
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#include <stdio.h>
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#include <assert.h>
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#include <vector>
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#include <algorithm>
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#include <ImfInputFile.h>
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#include <ImfRgbaFile.h>
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#include <ImfChannelList.h>
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#include <ImfFrameBuffer.h>
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#include <half.h>
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using namespace Imf;
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using namespace Imath;
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static float *OpenExrLoad(const char *name, int *width, int *height) {
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try {
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RgbaInputFile file (name);
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Box2i dw = file.dataWindow();
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*width = dw.max.x - dw.min.x + 1;
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*height = dw.max.y - dw.min.y + 1;
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std::vector<Rgba> pixels(*width * *height);
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file.setFrameBuffer(&pixels[0] - dw.min.x - dw.min.y * *width, 1, *width);
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file.readPixels(dw.min.y, dw.max.y);
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printf("OpenExr\n datawindow: (%d %d) - (%d %d)\n", dw.min.x, dw.min.y,
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dw.max.x, dw.max.y);
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printf(" line order %s\n", (file.lineOrder() == INCREASING_Y) ?
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"increasing y" : ((file.lineOrder() == DECREASING_Y) ? "decreasing y"
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: "random y"));
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printf(" compression: ");
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switch (file.compression()) {
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case NO_COMPRESSION: printf("none"); break;
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case RLE_COMPRESSION: printf("RLE"); break;
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case ZIPS_COMPRESSION: printf("zip"); break;
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case ZIP_COMPRESSION: printf("zips"); break;
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case PIZ_COMPRESSION: printf("piz"); break;
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case PXR24_COMPRESSION: printf("pxr24"); break;
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case B44_COMPRESSION: printf("b44"); break;
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case B44A_COMPRESSION: printf("b44a"); break;
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default: printf("unknown!");
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}
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printf("\n");
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printf(" channels: ");
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RgbaChannels channels = file.channels();
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if (channels & WRITE_R) printf("R");
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if (channels & WRITE_G) printf("G");
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if (channels & WRITE_B) printf("B");
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if (channels & WRITE_A) printf("A");
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if (channels & WRITE_Y) printf("Y");
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if (channels & WRITE_C) printf("C");
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printf("\n");
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float *ret = new float[4 * *width * *height];
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for (int i = 0; i < *width * *height; ++i) {
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ret[4*i] = pixels[i].r;
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ret[4*i+1] = pixels[i].g;
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ret[4*i+2] = pixels[i].b;
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ret[4*i+3] = pixels[i].a;
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}
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return ret;
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} catch (const std::exception &e) {
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return NULL;
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}
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}
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static void WriteImageEXR(const char *name, float *rgba,
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int xRes, int yRes) {
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Rgba *hrgba = new Rgba[xRes * yRes];
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for (int i = 0; i < xRes * yRes; ++i)
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hrgba[i] = Rgba(rgba[4*i], rgba[4*i+1], rgba[4*i+2], rgba[4*i+3]);
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Box2i displayWindow(V2i(0,0), V2i(xRes-1, yRes-1));
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Box2i dataWindow(V2i(0, 0), V2i(xRes - 1, yRes - 1));
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try {
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RgbaOutputFile file(name, displayWindow, dataWindow, WRITE_RGBA);
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file.setFrameBuffer(hrgba, 1, xRes);
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file.writePixels(yRes);
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}
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catch (const std::exception &e) {
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fprintf(stderr, "Unable to write image file \"%s\": %s", name,
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e.what());
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}
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delete[] hrgba;
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}
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int main(int argc, char *argv[]) {
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if (argc != 3) {
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fprintf(stderr, "usage: exrwritetest <tinyexr-filename.exr> <openexr-filename.exr>\n");
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return 1;
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}
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int w = 1;
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int h = 2;
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float *rgba = new float[4 * w * h];
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for (int i = 0; i < 4 * w * h; ++i) {
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rgba[i] = drand48();
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}
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WriteImageEXR(argv[2], rgba, w, h);
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const char *err;
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SaveEXR(rgba, w, h, argv[1], /* fp16 */1, &err);
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int ow, oh;
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float *orgba = OpenExrLoad(argv[2], &ow, &oh);
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int tw, th;
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float *trgba;
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if (LoadEXR(&trgba, &tw, &th, argv[1], &err) != 0) {
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fprintf(stderr, "exrwritetest: %s %s\n", argv[2], err);
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return 1;
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}
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int offset = 0;
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for (int y = 0; y < h; ++y) {
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for (int x = 0; x < w; ++x)
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for (int c = 0; c < 4; ++c, ++offset)
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if (orgba[offset] != trgba[offset])
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fprintf(stderr, "Mismatch at (%d,%d), component %d: "
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"orig %g, OpenEXR %g (err %g), tinyexr %g (err %g)\n",
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x, y, c, rgba[offset],
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orgba[offset], fabsf(rgba[offset] - orgba[offset]),
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trgba[offset], fabsf(rgba[offset] - trgba[offset]));
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}
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return 0;
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}
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