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annotate src/img_ldr_imlib2.c @ 1106:b5145de15ace

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Fix issue of alpha channel not working. Cairo is referene design of our graphic engine. It always trade an image as pre-multiplied, but imlib2 is not. It causes no opacity effects for the images loaded with imlib2. It is fixed by pre-multipling images loaded by imlib2.
author Thinker K.F. Li <thinker@codemud.net>
date Mon, 06 Dec 2010 01:05:32 +0800
parents 7b4e80ab671a
children 1c64a9cec2f2
rev   line source
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1 // -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
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2 // vim: sw=4:ts=8:sts=4
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3 #include <stdio.h>
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4 #include <stdint.h>
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5 #include <string.h>
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6 #include <Imlib2.h>
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7 #include "mb_graph_engine.h"
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8 #include "mb_tools.h"
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9 #include "mb_paint.h"
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10 #include "mb_img_ldr.h"
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11
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12 /*! \brief Simple image loader.
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13 *
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14 */
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15 struct _simple_mb_img_ldr {
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16 mb_img_ldr_t ldr;
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17 const char *repo; /*!< \brief The directory of repository. */
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18 };
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19 typedef struct _simple_mb_img_ldr simple_mb_img_ldr_t;
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20
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21 struct _simple_mb_img_data {
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22 mb_img_data_t img;
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23 };
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24 typedef struct _simple_mb_img_data simple_mb_img_data_t;
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25
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26 static void simple_mb_img_ldr_img_free(mb_img_data_t *img);
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27
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28 static
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29 mb_img_data_t *simple_mb_img_ldr_load(mb_img_ldr_t *ldr, const char *img_id) {
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30 simple_mb_img_ldr_t *sldr = (simple_mb_img_ldr_t *)ldr;
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31 simple_mb_img_data_t *img;
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32 Imlib_Image img_hdl;
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33 int w, h;
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34 int i, j, pos;
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35 uint32_t alpha;
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36 uint32_t value;
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37 uint32_t *data;
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38 uint32_t *premultiple_data;
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39 char *fname;
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40 int sz;
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41
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42 sz = strlen(sldr->repo);
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43 sz += strlen(img_id);
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44 fname = (char *)malloc(sz + 2);
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45 if (img_id[0] != '/')
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46 strcpy(fname, sldr->repo);
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47 else
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48 fname[0] = 0;
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49 strcat(fname, img_id);
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50
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51 img_hdl = imlib_load_image(fname);
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52 if(!img_hdl)
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53 return NULL;
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54 imlib_context_set_image(img_hdl);
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55 w = imlib_image_get_width();
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56 h = imlib_image_get_height();
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57 data = (uint32_t *)imlib_image_get_data_for_reading_only();
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58
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59 img = O_ALLOC(simple_mb_img_data_t);
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60 if(img == NULL) {
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61 imlib_free_image();
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62 return NULL;
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63 }
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64
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65 premultiple_data = (uint32_t *)malloc(4 * w * h);
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66 if(premultiple_data == NULL) {
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67 free(img);
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68 imlib_free_image();
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69 return NULL;
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70 }
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71 memcpy(premultiple_data, data, 4 * w * h);
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72
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73 /* Pre-multiply
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74 *
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75 * Our reference model is Cairo. In Cairo model, image is
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76 * pre-multiplied with alpha, but imlib2 is not. So, we do it
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77 * here.
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78 */
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79 pos = 0;
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80 for(i = 0; i < h; i++) {
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81 for(j = 0; j < w; j++) {
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82 value = data[pos];
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83 alpha = value >> 24;
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84 if(alpha == 0)
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85 value = 0;
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86 else if(alpha != 0xff) {
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87 value = (value & 0xff000000) |
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88 (((value & 0xff0000) * alpha / 0xff) & 0xff0000) |
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89 (((value & 0xff00) * alpha / 0xff) & 0xff00) |
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90 ((value & 0xff) * alpha / 0xff);
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91 }
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92 premultiple_data[pos++] = value;
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93 }
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94 }
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95
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96 img->img.content = premultiple_data;
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97 img->img.w = w;
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98 img->img.h = h;
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99 img->img.stride = w * 4;
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100 img->img.fmt = MB_IFMT_ARGB32;
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101 img->img.free = simple_mb_img_ldr_img_free;
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102
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103 imlib_free_image();
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104
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105 return (mb_img_data_t *)img;
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106 }
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107
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108 static
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109 void simple_mb_img_ldr_img_free(mb_img_data_t *img) {
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110 simple_mb_img_data_t *simg = (simple_mb_img_data_t *)img;
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111
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112 free(simg->img.content);
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113 free(img);
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114 }
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115
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116 static
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117 void simple_mb_img_ldr_free(mb_img_ldr_t *ldr) {
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118 simple_mb_img_ldr_t *defldr = (simple_mb_img_ldr_t *)ldr;
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119
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120 free((void *)defldr->repo);
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121 }
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122
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123 mb_img_ldr_t *simple_mb_img_ldr_new(const char *img_repository) {
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124 simple_mb_img_ldr_t *ldr;
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125 int sz;
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126
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127 if(img_repository == NULL)
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128 return NULL;
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129
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130 ldr = O_ALLOC(simple_mb_img_ldr_t);
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131 if(ldr == NULL)
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132 return NULL;
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133
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134 /*
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135 * Copy and formalize path of image repository.
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136 */
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137 sz = strlen(img_repository);
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138 ldr->repo = (const char *)malloc(sz + 2);
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139 if(ldr->repo == NULL) {
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140 free(ldr);
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141 return NULL;
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142 }
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143 strcpy((char *)ldr->repo, img_repository);
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144 if(img_repository[sz - 1] != '/' && strlen(img_repository) != 0) {
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145 ((char *)ldr->repo)[sz] = '/';
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Thinker K.F. Li <thinker@codemud.net>
parents:
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146 ((char *)ldr->repo)[sz + 1] = 0;
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147 }
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Thinker K.F. Li <thinker@codemud.net>
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148
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Thinker K.F. Li <thinker@codemud.net>
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149 ldr->ldr.load = simple_mb_img_ldr_load;
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Thinker K.F. Li <thinker@codemud.net>
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150 ldr->ldr.free = simple_mb_img_ldr_free;
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Thinker K.F. Li <thinker@codemud.net>
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151
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Thinker K.F. Li <thinker@codemud.net>
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152 return (mb_img_ldr_t *)ldr;
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153 }