Mercurial > MadButterfly

annotate src/shape_image.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 bae104d8d247
children 7bd6c0e88ec8
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 <string.h>
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5 #include "mb_graph_engine.h"
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6 #include "mb_types.h"
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7 #include "mb_shapes.h"
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8 #include "mb_img_ldr.h"
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9 #include "mb_tools.h"
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10
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11 /*! \page sh_image_n_image_ldr Image and Image Loader
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12 *
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13 * Image (\ref sh_image_t) is a shape to show an image on the output
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14 * device. Programmers manipulate object of an image shape to show it
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15 * at specified position with specified size. For a sh_image_t, an
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16 * image should be specified to fill the shape. Programmers must have
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17 * a way to load image from files. The solution proposed by MadButterfly
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18 * is image loader (\ref mb_img_ldr_t).
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19 *
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20 * Image loader is a repository of image files, programmers give him an
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21 * ID and get an image returned the loader. Image loader decodes image
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22 * files specified IDs and return them in an internal representation.
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23 * The internal representation of an array of pixels. Pixels are in
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24 * order of columns (X-axis) and then row by row (Y-axis). An pixel
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25 * can be 32bits, for ARGB, 24bits, for RGB, 8bits, for 8bits Alpha or
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26 * 256-grey-levels, and 1bits, for bitmap.
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27 *
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28 * Every row is padded to round to byte boundary, a rounded row is a stride.
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29 * Bytes a stride occupied is stride size. The internal rpresentation
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30 * is a series of strides. The data returned by image loader is
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31 * \ref mb_img_data_t type. mb_img_data_t::content is data in internal
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32 * representation.
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33 *
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34 * \ref simple_mb_img_ldr_t is a simple implementation of image loader.
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35 * It is a repository of image files in a directory and sub-directories.
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36 * ID of an image is mapped to a file in the directory and sub-directories.
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37 * ID it-self is a relative path relate to root directory of the repository.
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38 * \ref simple_mb_img_ldr_t handle PNG files only, now.
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39 *
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40 * \section get_img_ldr Get an Image Loader for Program
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41 * redraw_man_t::img_ldr is an image loader assigned by backend.
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42 * X backend, now, create an instance of simple_mb_img_ldr_t and assigns
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43 * the instance to redraw_man_t::img_ldr. Programmers should get
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44 * image loader assigned for a rdman by calling rdman_img_ldr().
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45 *
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46 * \image html image_n_ldr.png
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47 * \image latex image_n_ldr.eps "Relationship of image and loader" width=10cm
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48 */
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49
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50 #define ASSERT(x)
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51 #define OK 0
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52 #define ERR -1
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53
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54 /*! \brief Image shape.
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55 */
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56 typedef struct _sh_image {
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57 shape_t shape;
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58
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59 co_aix x, y;
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60 co_aix w, h;
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61 co_aix poses[4][2];
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62
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63 redraw_man_t *rdman;
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64 } sh_image_t;
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65
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66 static void sh_image_free(shape_t *shape);
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67
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68 /*! \brief Creae a new image shape.
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69 *
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70 * \param img_data is image data whose owner-ship is transfered.
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71 */
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72 shape_t *rdman_shape_image_new(redraw_man_t *rdman,
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73 co_aix x, co_aix y, co_aix w, co_aix h) {
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74 sh_image_t *img;
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75
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76 img = O_ALLOC(sh_image_t);
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77 if(img == NULL)
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78 return NULL;
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79
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80 memset(img, 0, sizeof(sh_image_t));
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81 mb_obj_init((mb_obj_t *)img, MBO_IMAGE);
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82 img->rdman = rdman;
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83 img->shape.free = sh_image_free;
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84
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85 img->x = x;
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86 img->y = y;
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87 img->w = w;
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88 img->h = h;
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89
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90 rdman_man_shape(rdman, (shape_t *)img);
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91
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92 return (shape_t *)img;
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93 }
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94
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95 shape_t *
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96 rdman_shape_image_clone(redraw_man_t *rdman, const shape_t *_src_img) {
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97 const sh_image_t *src_img = (const sh_image_t *)_src_img;
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98 sh_image_t *new_img;
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99
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100 new_img = (sh_image_t *)rdman_shape_image_new(rdman,
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101 src_img->x, src_img->y,
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102 src_img->w, src_img->h);
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103 if(new_img == NULL)
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104 return NULL;
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105
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106 sh_copy_style(rdman, (shape_t *)src_img, (shape_t *)new_img);
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107
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108 return (shape_t *)new_img;
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109 }
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110
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111 void sh_image_free(shape_t *shape) {
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112 sh_image_t *img = (sh_image_t *)shape;
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113
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114 mb_obj_destroy(shape);
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115 free(img);
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116 }
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117
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118 void sh_image_transform(shape_t *shape) {
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119 sh_image_t *img = (sh_image_t *)shape;
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120 paint_t *paint;
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121 co_aix (*poses)[2];
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122 co_aix img_matrix[6];
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123 co_aix rev_matrix[6];
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124 co_aix x_factor, y_factor;
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125 int img_w, img_h;
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126 int i;
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127
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128 poses = img->poses;
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129 poses[0][0] = img->x;
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130 poses[0][1] = img->y;
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131 poses[1][0] = img->x + img->w;
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132 poses[1][1] = img->y;
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133 poses[2][0] = img->x + img->w;
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134 poses[2][1] = img->y + img->h;
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135 poses[3][0] = img->x;
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136 poses[3][1] = img->y + img->h;
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137 for(i = 0; i < 4; i++)
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138 coord_trans_pos(img->shape.coord, &poses[i][0], &poses[i][1]);
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139
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140 geo_from_positions(sh_get_geo(shape), 4, poses);
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141
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142 paint = sh_get_fill(shape);
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143 if(paint == NULL)
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144 return;
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145
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146 ASSERT(paint.pnt_type == MBP_IMAGE);
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147
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148 paint_image_get_size(paint, &img_w, &img_h);
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149
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150 /* Transformation from image space to user space */
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151 img_matrix[0] = (poses[1][0] - poses[0][0]) / img->w;
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152 img_matrix[1] = (poses[3][0] - poses[3][0]) / img->h;
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153 img_matrix[2] = poses[0][0];
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154 img_matrix[3] = (poses[1][1] - poses[0][1]) / img->w;
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155 img_matrix[4] = (poses[3][1] - poses[0][1]) / img->h;
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156 img_matrix[5] = poses[0][1];
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157 if(img->w != img_w ||
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158 img->h != img_h) {
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159 /* Resize image */
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160 x_factor = img->w / img_w;
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161 img_matrix[0] *= x_factor;
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162 img_matrix[1] *= x_factor;
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163 y_factor = img->h / img_h;
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164 img_matrix[3] *= y_factor;
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165 img_matrix[4] *= y_factor;
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166 }
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167 compute_reverse(img_matrix, rev_matrix);
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168 paint_image_set_matrix(sh_get_fill(shape), rev_matrix);
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169 }
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170
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171 /*! \brief Draw image for an image shape.
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172 *
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173 * \note Image is not rescaled for size of the shape.
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174 */
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175 void sh_image_draw(shape_t *shape, mbe_t *cr) {
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176 sh_image_t *img = (sh_image_t *)shape;
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177
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178 mbe_move_to(cr, img->poses[0][0], img->poses[0][1]);
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179 mbe_line_to(cr, img->poses[1][0], img->poses[1][1]);
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180 mbe_line_to(cr, img->poses[2][0], img->poses[2][1]);
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181 mbe_line_to(cr, img->poses[3][0], img->poses[3][1]);
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182 mbe_close_path(cr);
257
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183 }
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184
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185 /*! \brief Change geometry of an image.
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186 *
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187 * Set position and size of an image.
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188 */
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189 void sh_image_set_geometry(shape_t *shape, co_aix x, co_aix y,
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190 co_aix w, co_aix h) {
257
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191 sh_image_t *img = (sh_image_t *)shape;
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192
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193 img->x = x;
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194 img->y = y;
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195 img->w = w;
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196 img->h = h;
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197 }