Mercurial > MadButterfly

annotate src/img_ldr_imlib2.c @ 1395:a768d74e5f49

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Fix the svg:use. For a svg:use, it is a group which include the content it reference. It means that we can not tween it to its origin object directly. Instead, we need to ungroup it and then use the result matrix to generate the tweened transformation matrix. Therefore, we need to concate its matrix to the referenced object. Ad center object when the bbox-x is not available.
author wycc
date Sat, 02 Apr 2011 05:36:36 +0800
parents 1c64a9cec2f2
children
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 != 0xff) {
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85 if(alpha == 0)
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86 value = 0;
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87 else {
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88 value = (value & 0xff000000) |
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89 (((value & 0xff0000) * alpha / 0xff) & 0xff0000) |
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90 (((value & 0xff00) * alpha / 0xff) & 0xff00) |
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91 ((value & 0xff) * alpha / 0xff);
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92 }
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93 }
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94 premultiple_data[pos++] = value;
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95 }
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96 }
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97
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98 img->img.content = premultiple_data;
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99 img->img.w = w;
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100 img->img.h = h;
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101 img->img.stride = w * 4;
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102 img->img.fmt = MB_IFMT_ARGB32;
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103 img->img.free = simple_mb_img_ldr_img_free;
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104
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105 imlib_free_image();
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106
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107 return (mb_img_data_t *)img;
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108 }
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109
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110 static
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111 void simple_mb_img_ldr_img_free(mb_img_data_t *img) {
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112 simple_mb_img_data_t *simg = (simple_mb_img_data_t *)img;
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113
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114 free(simg->img.content);
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115 free(img);
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116 }
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117
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118 static
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119 void simple_mb_img_ldr_free(mb_img_ldr_t *ldr) {
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120 simple_mb_img_ldr_t *defldr = (simple_mb_img_ldr_t *)ldr;
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121
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122 free((void *)defldr->repo);
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123 }
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124
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125 mb_img_ldr_t *simple_mb_img_ldr_new(const char *img_repository) {
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126 simple_mb_img_ldr_t *ldr;
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127 int sz;
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128
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129 if(img_repository == NULL)
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130 return NULL;
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131
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132 ldr = O_ALLOC(simple_mb_img_ldr_t);
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133 if(ldr == NULL)
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134 return NULL;
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135
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136 /*
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137 * Copy and formalize path of image repository.
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138 */
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139 sz = strlen(img_repository);
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140 ldr->repo = (const char *)malloc(sz + 2);
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141 if(ldr->repo == NULL) {
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142 free(ldr);
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143 return NULL;
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144 }
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Thinker K.F. Li <thinker@codemud.net>
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145 strcpy((char *)ldr->repo, img_repository);
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146 if(img_repository[sz - 1] != '/' && strlen(img_repository) != 0) {
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Thinker K.F. Li <thinker@codemud.net>
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147 ((char *)ldr->repo)[sz] = '/';
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Thinker K.F. Li <thinker@codemud.net>
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148 ((char *)ldr->repo)[sz + 1] = 0;
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149 }
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Thinker K.F. Li <thinker@codemud.net>
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150
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Thinker K.F. Li <thinker@codemud.net>
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151 ldr->ldr.load = simple_mb_img_ldr_load;
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Thinker K.F. Li <thinker@codemud.net>
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152 ldr->ldr.free = simple_mb_img_ldr_free;
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Thinker K.F. Li <thinker@codemud.net>
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153
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154 return (mb_img_ldr_t *)ldr;
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155 }