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70 lines
1.8 KiB
70 lines
1.8 KiB
/*
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* This file is part of MXE. See LICENSE.md for licensing information.
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*
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* This is a slightly modified version of:
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* http://ironalbatross.net/wiki/index.php5?title=CPP_LIBPNG#Minimal_Example_of_writing_a_PNG_File
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <png.h>
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int main(int argc, char *argv[])
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{
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(void)argc;
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(void)argv;
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/* PNG structs and types */
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png_byte color_type;
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png_byte bit_depth;
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png_structp png_ptr;
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png_infop info_ptr;
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png_bytep *row_pointers;
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int height, width;
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FILE *fp;
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width = 640;
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height = 480;
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color_type = PNG_COLOR_TYPE_RGB;
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bit_depth = 8; /* Number of bits per color, not per pixel */
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/* Dynamic 2D array in C */
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row_pointers = (png_bytep *)malloc( sizeof(png_bytep) * height);
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int i;
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for(i = 0; i < height; i++)
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{
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int j;
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row_pointers[i] = malloc(sizeof(png_byte) * width * 3);
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for(j = 0; j < width; j++)
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{
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row_pointers[i][0+3*j] = i % 255; /* R */
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row_pointers[i][1+3*j] = j % 255; /* G */
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row_pointers[i][2+3*j] = (i * j) % 255; /* B */
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}
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}
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/* Write the data out to the PNG file */
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fp = fopen("test.png","wb");
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png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
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info_ptr = png_create_info_struct(png_ptr);
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png_init_io(png_ptr,fp);
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png_set_IHDR(png_ptr, info_ptr, width, height,
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bit_depth, color_type, PNG_INTERLACE_NONE,
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PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
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png_write_info(png_ptr, info_ptr);
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png_write_image(png_ptr, row_pointers);
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png_write_end(png_ptr, NULL);
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/* Free up memory after use */
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for(i = 0; i < height; i++)
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{
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free(row_pointers[i]);
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}
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free(row_pointers);
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return 0;
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}
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