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annotate src/shape_image.c @ 592:de9d210e9c38 openvg

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Specify width and height while create an image surface
author Thinker K.F. Li <thinker@branda.to>
date Wed, 30 Jun 2010 19:53:10 +0800
parents ba64f928542b
children cbad519226d4
rev   line source
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1 #include <stdio.h>
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2 #include <string.h>
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3 #include "mb_graph_engine.h"
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4 #include "mb_types.h"
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5 #include "mb_shapes.h"
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6 #include "mb_img_ldr.h"
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7 #include "mb_tools.h"
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8
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9 /*! \page sh_image_n_image_ldr Image and Image Loader
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10 *
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11 * Image (\ref sh_image_t) is a shape to show an image on the output
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12 * device. Programmers manipulate object of an image shape to show it
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13 * at specified position with specified size. For a sh_image_t, an
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14 * image should be specified to fill the shape. Programmers must have
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15 * a way to load image from files. The solution proposed by MadButterfly
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16 * is image loader (\ref mb_img_ldr_t).
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17 *
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18 * Image loader is a repository of image files, programmers give him an
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19 * ID and get an image returned the loader. Image loader decodes image
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20 * files specified IDs and return them in an internal representation.
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21 * The internal representation of an array of pixels. Pixels are in
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22 * order of columns (X-axis) and then row by row (Y-axis). An pixel
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23 * can be 32bits, for ARGB, 24bits, for RGB, 8bits, for 8bits Alpha or
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24 * 256-grey-levels, and 1bits, for bitmap.
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25 *
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26 * Every row is padded to round to byte boundary, a rounded row is a stride.
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27 * Bytes a stride occupied is stride size. The internal rpresentation
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28 * is a series of strides. The data returned by image loader is
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29 * \ref mb_img_data_t type. mb_img_data_t::content is data in internal
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30 * representation.
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31 *
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32 * \ref simple_mb_img_ldr_t is a simple implementation of image loader.
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33 * It is a repository of image files in a directory and sub-directories.
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34 * ID of an image is mapped to a file in the directory and sub-directories.
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35 * ID it-self is a relative path relate to root directory of the repository.
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36 * \ref simple_mb_img_ldr_t handle PNG files only, now.
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37 *
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38 * \section get_img_ldr Get an Image Loader for Program
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39 * redraw_man_t::img_ldr is an image loader assigned by backend.
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40 * X backend, now, create an instance of simple_mb_img_ldr_t and assigns
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41 * the instance to redraw_man_t::img_ldr. Programmers should get
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42 * image loader assigned for a rdman by calling rdman_img_ldr().
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43 *
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44 * \image html image_n_ldr.png
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45 * \image latex image_n_ldr.eps "Relationship of image and loader" width=10cm
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46 */
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47
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48 #define ASSERT(x)
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49 #define OK 0
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50 #define ERR -1
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51
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52 /*! \brief Image shape.
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53 */
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54 typedef struct _sh_image {
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55 shape_t shape;
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56
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57 co_aix x, y;
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58 co_aix w, h;
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59 co_aix poses[4][2];
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60
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61 redraw_man_t *rdman;
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62 } sh_image_t;
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63
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64 static void sh_image_free(shape_t *shape);
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65
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66 /*! \brief Creae a new image shape.
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67 *
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68 * \param img_data is image data whose owner-ship is transfered.
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69 */
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70 shape_t *rdman_shape_image_new(redraw_man_t *rdman,
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71 co_aix x, co_aix y, co_aix w, co_aix h) {
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72 sh_image_t *img;
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73 mb_img_fmt_t fmt;
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74 int r;
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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 return (shape_t *)img;
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91 }
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92
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93 void sh_image_free(shape_t *shape) {
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94 sh_image_t *img = (sh_image_t *)shape;
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95
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96 mb_obj_destroy(shape);
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97 free(img);
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98 }
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99
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100 void sh_image_transform(shape_t *shape) {
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101 sh_image_t *img = (sh_image_t *)shape;
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102 paint_t *paint;
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103 co_aix (*poses)[2];
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104 co_aix img_matrix[6];
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105 co_aix x_factor, y_factor;
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106 int img_w, img_h;
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107 int i;
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108
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109 poses = img->poses;
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110 poses[0][0] = img->x;
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111 poses[0][1] = img->y;
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112 poses[1][0] = img->x + img->w;
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113 poses[1][1] = img->y;
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114 poses[2][0] = img->x + img->w;
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115 poses[2][1] = img->y + img->h;
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116 poses[3][0] = img->x;
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117 poses[3][1] = img->y + img->h;
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118 for(i = 0; i < 4; i++)
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119 coord_trans_pos(img->shape.coord, &poses[i][0], &poses[i][1]);
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120
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121 geo_from_positions(sh_get_geo(shape), 4, poses);
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122
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123 paint = sh_get_fill(shape);
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124 if(paint == NULL)
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125 return;
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126
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127 ASSERT(paint.pnt_type == MBP_IMAGE);
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128
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129 paint_image_get_size(paint, &img_w, &img_h);
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130
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131 /* Transformation from user space to image space */
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132 img_matrix[0] = (poses[1][0] - poses[0][0]) / img->w;
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133 img_matrix[1] = (poses[1][1] - poses[0][1]) / img->w;
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134 img_matrix[2] = -poses[0][0];
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135 img_matrix[3] = (poses[3][0] - poses[0][0]) / img->h;
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136 img_matrix[4] = (poses[3][1] - poses[0][1]) / img->h;
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137 img_matrix[5] = -poses[0][1];
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138 if(img->w != img_w ||
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139 img->h != img_h) {
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140 /* Resize image */
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141 x_factor = img_w / img->w;
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142 img_matrix[0] *= x_factor;
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143 img_matrix[1] *= x_factor;
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144 img_matrix[2] *= x_factor;
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145 y_factor = img_h / img->h;
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146 img_matrix[3] *= y_factor;
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147 img_matrix[4] *= y_factor;
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148 img_matrix[5] *= y_factor;
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149 }
260
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150 paint_image_set_matrix(sh_get_fill(shape), img_matrix);
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151 }
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152
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153 /*! \brief Draw image for an image shape.
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154 *
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155 * \note Image is not rescaled for size of the shape.
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156 */
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157 void sh_image_draw(shape_t *shape, mbe_t *cr) {
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158 sh_image_t *img = (sh_image_t *)shape;
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159 mbe_pattern_t *saved_source;
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160 co_aix *aggr;
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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 }