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annotate src/libpng-test.c @ 1631:9a86031b8ee0

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package libpng: add test program
author Tony Theodore <tonyt@logyst.com>
date Sun, 06 Mar 2011 17:20:30 +1100
parents
children f653602a0500
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1631
9a86031b8ee0 package libpng: add test program
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1 /* This file is part of mingw-cross-env. */
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2 /* See doc/index.html for further information. */
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3
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4 /* This is a slightly modified version of: */
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5 /* http://ironalbatross.net/wiki/index.php5?title=CPP_LIBPNG#Minimal_Example_of_writing_a_PNG_File */
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6
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <unistd.h>
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10 #include <string.h>
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11 #include <png.h>
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12
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13 int main(int argc, char *argv[])
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14 {
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15 (void)argc;
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16 (void)argv;
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17
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18 /* PNG structs and types */
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19 png_byte color_type;
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20 png_byte bit_depth;
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21 png_structp png_ptr;
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22 png_infop info_ptr;
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23 png_bytep *row_pointers;
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24
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25 int height, width;
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26 FILE *fp;
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27
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28 width = 640;
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29 height = 480;
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30
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31 color_type = PNG_COLOR_TYPE_RGB;
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32 bit_depth = 8; /* Number of bits per color, not per pixel */
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33
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34 /* Dynamic 2D array in C */
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35 row_pointers = (png_bytep *)malloc( sizeof(png_bytep) * height);
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36 int i;
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37 for(i = 0; i < height; i++)
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38 {
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39 int j;
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40 row_pointers[i] = malloc(sizeof(png_byte) * width * 3);
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41 for(j = 0; j < width; j++)
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42 {
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43 row_pointers[i][0+3*j] = i % 255; /* R */
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44 row_pointers[i][1+3*j] = j % 255; /* G */
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45 row_pointers[i][2+3*j] = (i * j) % 255; /* B */
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46 }
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47 }
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48
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49 /* Write the data out to the PNG file */
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50 fp = fopen("test.png","wb");
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51 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
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52 info_ptr = png_create_info_struct(png_ptr);
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53 png_init_io(png_ptr,fp);
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54 png_set_IHDR(png_ptr, info_ptr, width, height,
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55 bit_depth, color_type, PNG_INTERLACE_NONE,
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56 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
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57 png_write_info(png_ptr, info_ptr);
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58 png_write_image(png_ptr, row_pointers);
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59 png_write_end(png_ptr, NULL);
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60
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61 /* Free up memory after use */
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62 for(i = 0; i < height; i++)
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63 {
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64 free(row_pointers[i]);
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65 }
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66 free(row_pointers);
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67
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68 return 0;
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69 }