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-/*

-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 <iostream>

-

-/*

-3 ways to decode a PNG from a file to RGBA pixel data (and 2 in-memory ways).

-*/

-

-//g++ lodepng.cpp example_decode.cpp -ansi -pedantic -Wall -Wextra -O3

-

-

-//Example 1

-//Decode from disk to raw pixels with a single function call

-void decodeOneStep(const char* filename)

-{

-  std::vector<unsigned char> image; //the raw pixels

-  unsigned width, height;

-

-  //decode

-  unsigned error = lodepng::decode(image, width, height, filename);

-

-  //if there's an error, display it

-  if(error) std::cout << "decoder error " << error << ": " << lodepng_error_text(error) << std::endl;

-

-  //the pixels are now in the vector "image", 4 bytes per pixel, ordered RGBARGBA..., use it as texture, draw it, ...

-}

-

-//Example 2

-//Load PNG file from disk to memory first, then decode to raw pixels in memory.

-void decodeTwoSteps(const char* filename)

-{

-  std::vector<unsigned char> png;

-  std::vector<unsigned char> image; //the raw pixels

-  unsigned width, height;

-

-  //load and decode

-  lodepng::load_file(png, filename);

-  unsigned error = lodepng::decode(image, width, height, png);

-

-  //if there's an error, display it

-  if(error) std::cout << "decoder error " << error << ": " << lodepng_error_text(error) << std::endl;

-

-  //the pixels are now in the vector "image", 4 bytes per pixel, ordered RGBARGBA..., use it as texture, draw it, ...

-}

-

-//Example 3

-//Load PNG file from disk using a State, normally needed for more advanced usage.

-void decodeWithState(const char* filename)

-{

-  std::vector<unsigned char> png;

-  std::vector<unsigned char> image; //the raw pixels

-  unsigned width, height;

-  lodepng::State state; //optionally customize this one

-

-  lodepng::load_file(png, filename); //load the image file with given filename

-  unsigned error = lodepng::decode(image, width, height, state, png);

-

-  //if there's an error, display it

-  if(error) std::cout << "decoder error " << error << ": "<< lodepng_error_text(error) << std::endl;

-

-  //the pixels are now in the vector "image", 4 bytes per pixel, ordered RGBARGBA..., use it as texture, draw it, ...

-  //State state contains extra information about the PNG such as text chunks, ...

-}

-

-int main(int argc, char *argv[])

-{

-  const char* filename = argc > 1 ? argv[1] : "test.png";

-

-  decodeOneStep(filename);

-}

-