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annotate src/libpng-test.c @ 5893:53a6c7df43f8

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Mesa 3D: Update to version 21.1.8. * src/mesa.mk: Update version and checksum. * src/mesa-2-uninitialized.patch: Remove file. * dist-files.mk: Remove file from list.
author Markus Mützel <markus.muetzel@gmx.de>
date Thu, 16 Sep 2021 22:37:45 +0200
parents 14b3f5ea78ae
children
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1 /*
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2 * This file is part of MXE.
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3 * See index.html for further information.
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4 *
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5 * This is a slightly modified version of:
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6 * http://ironalbatross.net/wiki/index.php5?title=CPP_LIBPNG#Minimal_Example_of_writing_a_PNG_File
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7 */
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8
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <unistd.h>
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12 #include <string.h>
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13 #include <png.h>
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14
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15 int main(int argc, char *argv[])
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16 {
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17 (void)argc;
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18 (void)argv;
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19
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20 /* PNG structs and types */
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21 png_byte color_type;
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22 png_byte bit_depth;
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23 png_structp png_ptr;
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24 png_infop info_ptr;
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25 png_bytep *row_pointers;
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26
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27 int height, width;
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28 FILE *fp;
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29
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30 width = 640;
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31 height = 480;
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32
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33 color_type = PNG_COLOR_TYPE_RGB;
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34 bit_depth = 8; /* Number of bits per color, not per pixel */
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35
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36 /* Dynamic 2D array in C */
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37 row_pointers = (png_bytep *)malloc( sizeof(png_bytep) * height);
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38 int i;
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39 for(i = 0; i < height; i++)
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40 {
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41 int j;
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42 row_pointers[i] = malloc(sizeof(png_byte) * width * 3);
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43 for(j = 0; j < width; j++)
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44 {
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45 row_pointers[i][0+3*j] = i % 255; /* R */
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46 row_pointers[i][1+3*j] = j % 255; /* G */
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47 row_pointers[i][2+3*j] = (i * j) % 255; /* B */
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48 }
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49 }
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50
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51 /* Write the data out to the PNG file */
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52 fp = fopen("test.png","wb");
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53 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
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54 info_ptr = png_create_info_struct(png_ptr);
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55 png_init_io(png_ptr,fp);
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56 png_set_IHDR(png_ptr, info_ptr, width, height,
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57 bit_depth, color_type, PNG_INTERLACE_NONE,
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58 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
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59 png_write_info(png_ptr, info_ptr);
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60 png_write_image(png_ptr, row_pointers);
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61 png_write_end(png_ptr, NULL);
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62
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63 /* Free up memory after use */
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64 for(i = 0; i < height; i++)
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65 {
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66 free(row_pointers[i]);
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67 }
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68 free(row_pointers);
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69
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70 return 0;
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71 }