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annotate src/img_ldr.c @ 268:43900cae1d49

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Support resizing for image. - Programmers can change size of image that showed on the output device.
author Thinker K.F. Li <thinker@branda.to>
date Sat, 24 Jan 2009 18:19:02 +0800
parents 50d253d0fcba
children b391722bf20e
rev   line source
257
50d253d0fcba Simple image loader and image shape.
Thinker K.F. Li <thinker@branda.to>
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1 #include <stdio.h>
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2 #include <string.h>
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3 #include <cairo.h>
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4 #include "mb_tools.h"
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5 #include "mb_img_ldr.h"
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6
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7 /*! \brief Simple image loader.
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8 *
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9 */
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10 struct _simple_mb_img_ldr {
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11 mb_img_ldr_t ldr;
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12 const char *repo; /*!< \brief The directory of repository. */
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13 };
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14 typedef struct _simple_mb_img_ldr simple_mb_img_ldr_t;
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15
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16 struct _simple_mb_img_data {
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17 mb_img_data_t img;
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18 cairo_surface_t *surf;
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19 };
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20 typedef struct _simple_mb_img_data simple_mb_img_data_t;
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21
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22 static void simple_mb_img_ldr_img_free(mb_img_data_t *img);
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23
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24 static
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25 mb_img_data_t *simple_mb_img_ldr_load(mb_img_ldr_t *ldr, const char *img_id) {
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26 simple_mb_img_ldr_t *sldr = (simple_mb_img_ldr_t *)ldr;
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27 simple_mb_img_data_t *img;
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28 cairo_surface_t *surf;
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29 char *fname;
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30 cairo_format_t fmt;
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31 int sz;
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32
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33 sz = strlen(sldr->repo);
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34 sz += strlen(img_id);
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35 fname = (char *)malloc(sz + 2);
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36 strcpy(fname, sldr->repo);
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37 strcat(fname, img_id);
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38
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39 surf = cairo_image_surface_create_from_png(fname);
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40 if(surf == NULL)
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41 return NULL;
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42
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43 img = O_ALLOC(simple_mb_img_data_t);
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44 if(img == NULL) {
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45 cairo_surface_destroy(surf);
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46 return NULL;
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47 }
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48 img->img.content = cairo_image_surface_get_data(surf);
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49 img->img.w = cairo_image_surface_get_width(surf);
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50 img->img.h = cairo_image_surface_get_height(surf);
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51 img->img.stride = cairo_image_surface_get_stride(surf);
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52 fmt = cairo_image_surface_get_format(surf);
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53 switch(fmt) {
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54 case CAIRO_FORMAT_ARGB32:
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55 img->img.fmt = MB_IFMT_ARGB32;
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56 break;
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57
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58 case CAIRO_FORMAT_RGB24:
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59 img->img.fmt = MB_IFMT_RGB24;
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60 break;
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61
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62 case CAIRO_FORMAT_A8:
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63 img->img.fmt = MB_IFMT_A8;
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64 break;
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65
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66 case CAIRO_FORMAT_A1:
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67 img->img.fmt = MB_IFMT_A1;
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68 break;
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69
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70 default:
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71 cairo_surface_destroy(surf);
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72 free(img);
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73 return NULL;
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74 }
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75 img->img.free = simple_mb_img_ldr_img_free;
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76 img->surf = surf;
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77
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78 return (mb_img_data_t *)img;
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79 }
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80
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81 static
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82 void simple_mb_img_ldr_img_free(mb_img_data_t *img) {
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83 simple_mb_img_data_t *simg = (simple_mb_img_data_t *)img;
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84 cairo_surface_destroy((cairo_surface_t *)simg->surf);
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85 free(img);
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86 }
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87
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88 static
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89 void simple_mb_img_ldr_free(mb_img_ldr_t *ldr) {
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90 simple_mb_img_ldr_t *defldr = (simple_mb_img_ldr_t *)ldr;
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91
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92 free((void *)defldr->repo);
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93 }
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94
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95 mb_img_ldr_t *simple_mb_img_ldr_new(const char *img_repository) {
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96 simple_mb_img_ldr_t *ldr;
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97 int sz;
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98
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99 if(img_repository == NULL)
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100 return NULL;
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101
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102 ldr = O_ALLOC(simple_mb_img_ldr_t);
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103 if(ldr == NULL)
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104 return NULL;
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105
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106 /*
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107 * Copy and formalize path of image repository.
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108 */
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109 sz = strlen(img_repository);
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110 ldr->repo = (const char *)malloc(sz + 2);
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111 if(ldr->repo == NULL) {
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112 free(ldr);
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113 return NULL;
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114 }
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115 strcpy((char *)ldr->repo, img_repository);
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116 if(img_repository[sz - 1] != '/') {
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117 ((char *)ldr->repo)[sz] = '/';
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118 ((char *)ldr->repo)[sz + 1] = 0;
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119 }
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120
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121 ldr->ldr.load = simple_mb_img_ldr_load;
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122 ldr->ldr.free = simple_mb_img_ldr_free;
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123
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124 return (mb_img_ldr_t *)ldr;
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125 }