Mercurial > MadButterfly

annotate src/shape_image.c @ 880:ac3e8492ad74 abs_n_rel_center

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Formalize path data for MadButterfly. Inkscape and other editors would omit 'l' or 'L' after 'm' or 'M'. MadButterfly can not handle it, now. So, we work around it at SVG parser.
author Thinker K.F. Li <thinker@codemud.net>
date Sat, 25 Sep 2010 18:46:37 +0800
parents 586e50f82c1f
children a8d20bc8ce40
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_shape_man(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 void sh_image_free(shape_t *shape) {
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96 sh_image_t *img = (sh_image_t *)shape;
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97
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98 mb_obj_destroy(shape);
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99 free(img);
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100 }
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101
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102 void sh_image_transform(shape_t *shape) {
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103 sh_image_t *img = (sh_image_t *)shape;
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104 paint_t *paint;
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105 co_aix (*poses)[2];
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106 co_aix img_matrix[6];
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107 co_aix rev_matrix[6];
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108 co_aix x_factor, y_factor;
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109 int img_w, img_h;
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110 int i;
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111
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112 poses = img->poses;
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113 poses[0][0] = img->x;
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114 poses[0][1] = img->y;
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115 poses[1][0] = img->x + img->w;
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116 poses[1][1] = img->y;
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117 poses[2][0] = img->x + img->w;
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118 poses[2][1] = img->y + img->h;
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119 poses[3][0] = img->x;
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120 poses[3][1] = img->y + img->h;
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121 for(i = 0; i < 4; i++)
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122 coord_trans_pos(img->shape.coord, &poses[i][0], &poses[i][1]);
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123
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124 geo_from_positions(sh_get_geo(shape), 4, poses);
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125
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126 paint = sh_get_fill(shape);
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127 if(paint == NULL)
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128 return;
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129
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130 ASSERT(paint.pnt_type == MBP_IMAGE);
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131
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132 paint_image_get_size(paint, &img_w, &img_h);
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133
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134 /* Transformation from image space to user space */
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135 img_matrix[0] = (poses[1][0] - poses[0][0]) / img->w;
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136 img_matrix[1] = (poses[3][0] - poses[3][0]) / img->h;
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137 img_matrix[2] = poses[0][0];
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138 img_matrix[3] = (poses[1][1] - poses[0][1]) / img->w;
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139 img_matrix[4] = (poses[3][1] - poses[0][1]) / img->h;
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140 img_matrix[5] = poses[0][1];
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141 if(img->w != img_w ||
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142 img->h != img_h) {
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143 /* Resize image */
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144 x_factor = img->w / img_w;
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145 img_matrix[0] *= x_factor;
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146 img_matrix[1] *= x_factor;
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147 y_factor = img->h / img_h;
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148 img_matrix[3] *= y_factor;
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149 img_matrix[4] *= y_factor;
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150 }
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151 compute_reverse(img_matrix, rev_matrix);
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152 paint_image_set_matrix(sh_get_fill(shape), rev_matrix);
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153 }
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154
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155 /*! \brief Draw image for an image shape.
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156 *
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157 * \note Image is not rescaled for size of the shape.
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158 */
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159 void sh_image_draw(shape_t *shape, mbe_t *cr) {
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160 sh_image_t *img = (sh_image_t *)shape;
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161
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162 mbe_move_to(cr, img->poses[0][0], img->poses[0][1]);
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163 mbe_line_to(cr, img->poses[1][0], img->poses[1][1]);
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164 mbe_line_to(cr, img->poses[2][0], img->poses[2][1]);
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165 mbe_line_to(cr, img->poses[3][0], img->poses[3][1]);
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166 mbe_close_path(cr);
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167 }
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168
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169 /*! \brief Change geometry of an image.
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170 *
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171 * Set position and size of an image.
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172 */
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173 void sh_image_set_geometry(shape_t *shape, co_aix x, co_aix y,
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174 co_aix w, co_aix h) {
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175 sh_image_t *img = (sh_image_t *)shape;
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176
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177 img->x = x;
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178 img->y = y;
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179 img->w = w;
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180 img->h = h;
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181 }