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1 /* This code is part of RGB Image Library |
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2 see URL: xxx */ |
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3 |
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4 /************************************************************************** |
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5 |
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6 RGB Image Library (rgbimagelib) |
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7 File: image.c |
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8 |
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9 Copyright (c) 2006 Radek Brich |
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10 |
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11 Permission is hereby granted, free of charge, to any person |
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12 obtaining a copy of this software and associated documentation |
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13 files (the "Software"), to deal in the Software without |
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14 restriction, including without limitation the rights to use, |
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15 copy, modify, merge, publish, distribute, sublicense, and/or sell |
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16 copies of the Software, and to permit persons to whom the |
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17 Software is furnished to do so, subject to the following |
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18 conditions: |
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19 |
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20 The above copyright notice and this permission notice shall be |
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21 included in all copies or substantial portions of the Software. |
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22 |
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23 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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24 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES |
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25 OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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26 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT |
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27 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
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28 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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29 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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30 OTHER DEALINGS IN THE SOFTWARE. |
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31 |
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32 **************************************************************************/ |
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33 |
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34 #include <stdio.h> |
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35 #include <stdlib.h> |
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36 #include <png.h> |
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37 |
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38 #include "image.h" |
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39 |
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40 int new_image(struct image **img, int width, int height, int pixelsize) |
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41 { |
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42 *img = (struct image *) malloc(sizeof(struct image)); |
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43 (*img)->pixel_size = pixelsize; |
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44 (*img)->width = width; |
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45 (*img)->height = height; |
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46 (*img)->data = (char *) malloc(width * height * pixelsize); |
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47 return(0); |
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48 } |
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49 |
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50 int destroy_image(struct image **img) |
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51 { |
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52 free((*img)->data); |
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53 free(*img); |
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54 *img = NULL; |
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55 } |
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56 |
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57 /* funkce pro ulozeni obrazku do PNG souboru (vyuziva knihovnu libpng) */ |
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58 int save_png(const char *fname, struct image *img) |
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59 { |
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60 int y; /* pomocna promenna pro pruchod radku obrazu */ |
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61 FILE *f; |
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62 png_structp png; /* PNG data */ |
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63 png_infop pnginfo; /* PNG info */ |
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64 char *data; |
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65 |
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66 if ((f = fopen(fname, "wb")) == NULL) |
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67 return (0); |
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68 |
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69 png = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0); |
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70 if (!png) { |
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71 fclose(f); |
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72 return (0); |
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73 } |
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74 |
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75 pnginfo = png_create_info_struct(png); |
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76 if (!pnginfo) { |
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77 fclose(f); |
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78 png_destroy_write_struct(&png, 0); |
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79 return (0); |
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80 } |
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81 |
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82 if (setjmp(png_jmpbuf(png))) { |
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83 fclose(f); |
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84 png_destroy_write_struct(&png, &pnginfo); |
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85 return (0); |
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86 } |
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87 |
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88 /* predat knihovne PNG ukazatel na soubor */ |
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89 png_init_io(png, f); |
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90 |
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91 /* parametry PNG */ |
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92 png_set_compression_level(png, Z_BEST_COMPRESSION); |
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93 png_set_IHDR(png, pnginfo, img->width, img->height, 8, PNG_COLOR_TYPE_RGB, |
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94 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, |
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95 PNG_FILTER_TYPE_DEFAULT); |
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96 png_set_sRGB(png, pnginfo, PNG_sRGB_INTENT_PERCEPTUAL); |
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97 png_set_sRGB_gAMA_and_cHRM(png, pnginfo, PNG_INFO_sRGB); |
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98 |
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99 /* zapsat hlavicku */ |
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100 png_write_info(png, pnginfo); |
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101 |
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102 /* zapsat data */ |
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103 data = img->data; |
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104 for (y = 0; y < img->height; y++, data += img->width * img->pixel_size) |
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105 png_write_row(png, (png_byte *) data); |
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106 |
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107 /* ukoncit soubor a uvolnit pomocne struktury */ |
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108 png_write_end(png, pnginfo); |
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109 png_destroy_write_struct(&png, 0); |
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110 |
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111 fclose(f); |
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112 |
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113 return (1); |
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114 } |