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