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authorLode <lvandeve@gmail.com>2015-02-16 22:55:55 +0100
committerLode <lvandeve@gmail.com>2015-02-16 22:55:55 +0100
commitbf2aa0a46fc8c1d398604cd384bc2c583774cc1f (patch)
tree08a444bab7d70c828f158608a9a2849b86b133c1 /example_png2bmp.cpp
parent9eaef3d1764f0e1e0234362824d30fc2df51af4d (diff)
move examples to examples directory
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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>
-
-/*
-This example converts a PNG file to a BMP file.
-NOTE: it overwrites the output file without warning if it exists!
-Give the PNG and the BMP file names as command line arguments.
-*/
-
-/*
-g++ lodepng.cpp example_png2bmp.cpp -Wall -Wextra -pedantic -ansi -lSDL -O3
-*/
-
-
-
-//Input image must be RGB buffer (3 bytes per pixel), but you can easily make it
-//support RGBA input and output by changing the inputChannels and/or outputChannels
-//in the function to 4.
-void encodeBMP(std::vector<unsigned char>& bmp, const unsigned char* image, int w, int h)
-{
- //3 bytes per pixel used for both input and output.
- int inputChannels = 3;
- int outputChannels = 3;
-
- //bytes 0-13
- bmp.push_back('B'); bmp.push_back('M'); //0: bfType
- bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); //2: bfSize; size not yet known for now, filled in later.
- bmp.push_back(0); bmp.push_back(0); //6: bfReserved1
- bmp.push_back(0); bmp.push_back(0); //8: bfReserved2
- bmp.push_back(54 % 256); bmp.push_back(54 / 256); bmp.push_back(0); bmp.push_back(0); //10: bfOffBits (54 header bytes)
-
- //bytes 14-53
- bmp.push_back(40); bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); //14: biSize
- bmp.push_back(w % 256); bmp.push_back(w / 256); bmp.push_back(0); bmp.push_back(0); //18: biWidth
- bmp.push_back(h % 256); bmp.push_back(h / 256); bmp.push_back(0); bmp.push_back(0); //22: biHeight
- bmp.push_back(1); bmp.push_back(0); //26: biPlanes
- bmp.push_back(outputChannels * 8); bmp.push_back(0); //28: biBitCount
- bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); //30: biCompression
- bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); //34: biSizeImage
- bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); //38: biXPelsPerMeter
- bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); //42: biYPelsPerMeter
- bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); //46: biClrUsed
- bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); bmp.push_back(0); //50: biClrImportant
-
- /*
- Convert the input RGBRGBRGB pixel buffer to the BMP pixel buffer format. There are 3 differences with the input buffer:
- -BMP stores the rows inversed, from bottom to top
- -BMP stores the color channels in BGR instead of RGB order
- -BMP requires each row to have a multiple of 4 bytes, so sometimes padding bytes are added between rows
- */
-
- int imagerowbytes = outputChannels * w;
- imagerowbytes = imagerowbytes % 4 == 0 ? imagerowbytes : imagerowbytes + (4 - imagerowbytes % 4); //must be multiple of 4
-
- for(int y = h - 1; y >= 0; y--) //the rows are stored inversed in bmp
- {
- int c = 0;
- for(int x = 0; x < imagerowbytes; x++)
- {
- if(x < w * outputChannels)
- {
- int inc = c;
- //Convert RGB(A) into BGR(A)
- if(c == 0) inc = 2;
- else if(c == 2) inc = 0;
- bmp.push_back(image[inputChannels * (w * y + x / outputChannels) + inc]);
- }
- else bmp.push_back(0);
- c++;
- if(c >= outputChannels) c = 0;
- }
- }
-
- // Fill in the size
- bmp[2] = bmp.size() % 256;
- bmp[3] = (bmp.size() / 256) % 256;
- bmp[4] = (bmp.size() / 65536) % 256;
- bmp[5] = bmp.size() / 16777216;
-}
-
-int main(int argc, char *argv[])
-{
- if(argc < 3)
- {
- std::cout << "Please provice input PNG and output BMP file names" << std::endl;
- return 0;
- }
- const char* infile = argv[1];
- const char* outfile = argv[2];
-
-
- std::vector<unsigned char> image; //the raw pixels
- unsigned width, height;
-
- unsigned error = lodepng::decode(image, width, height, infile, LCT_RGB, 8);
-
- if(error)
- {
- std::cout << "error " << error << ": " << lodepng_error_text(error) << std::endl;
- return 0;
- }
-
- std::vector<unsigned char> bmp;
- encodeBMP(bmp, &image[0], width, height);
-
- lodepng::save_file(bmp, outfile);
-}