Add ktx

2026-06-14 19:09:18 +01:00
parent 14bd1a9271
commit 13fa90a0e9
3958 changed files with 999286 additions and 4 deletions
@@ -0,0 +1,109 @@
+/*
+LodePNG Examples
+
+Copyright (c) 2005-2012 Lode Vandevenne
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+*/
+
+#include "lodepng.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+/*
+3 ways to decode a PNG from a file to RGBA pixel data (and 2 in-memory ways).
+*/
+
+/*
+Example 1
+Decode from disk to raw pixels with a single function call
+*/
+void decodeOneStep(const char* filename) {
+  unsigned error;
+  unsigned char* image = 0;
+  unsigned width, height;
+
+  error = lodepng_decode32_file(&image, &width, &height, filename);
+  if(error) printf("error %u: %s\n", error, lodepng_error_text(error));
+
+  /*use image here*/
+
+  free(image);
+}
+
+/*
+Example 2
+Load PNG file from disk to memory first, then decode to raw pixels in memory.
+*/
+void decodeTwoSteps(const char* filename) {
+  unsigned error;
+  unsigned char* image = 0;
+  unsigned width, height;
+  unsigned char* png = 0;
+  size_t pngsize;
+
+  error = lodepng_load_file(&png, &pngsize, filename);
+  if(!error) error = lodepng_decode32(&image, &width, &height, png, pngsize);
+  if(error) printf("error %u: %s\n", error, lodepng_error_text(error));
+
+  free(png);
+
+  /*use image here*/
+
+  free(image);
+}
+
+/*
+Example 3
+Load PNG file from disk using a State, normally needed for more advanced usage.
+*/
+void decodeWithState(const char* filename) {
+  unsigned error;
+  unsigned char* image = 0;
+  unsigned width, height;
+  unsigned char* png = 0;
+  size_t pngsize;
+  LodePNGState state;
+
+  lodepng_state_init(&state);
+  /*optionally customize the state*/
+
+  error = lodepng_load_file(&png, &pngsize, filename);
+  if(!error) error = lodepng_decode(&image, &width, &height, &state, png, pngsize);
+  if(error) printf("error %u: %s\n", error, lodepng_error_text(error));
+
+  free(png);
+
+  /*use image here*/
+  /*state contains extra information about the PNG such as text chunks, ...*/
+
+  lodepng_state_cleanup(&state);
+  free(image);
+}
+
+int main(int argc, char *argv[]) {
+  const char* filename = argc > 1 ? argv[1] : "test.png";
+
+  decodeOneStep(filename);
+
+  return 0;
+}
+