annotate src/paint.c @ 776:77b561bb7929

Implement new algorithm to calculate the origin of the SVG elemnts so that we can implement object resize without changing the position of the object. However, the image does not work here since it does not use the transformation of the group.
author wycc
date Mon, 30 Aug 2010 08:56:44 +0800
parents f43224bf3524
children 586e50f82c1f
rev   line source
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include "mb_graph_engine.h"
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4 #include "mb_paint.h"
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5
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6 #define ASSERT(x)
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7
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8 /*! \brief Solid color paint.
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9 */
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10 typedef struct _paint_color {
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11 paint_t paint;
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12 co_comp_t r, g, b, a;
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13 } paint_color_t;
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15 int _paint_color_size = sizeof(paint_color_t);
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17
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18 static void paint_color_prepare(paint_t *paint, mbe_t *cr) {
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19 paint_color_t *color = (paint_color_t *)paint;
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20
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21 mbe_set_source_rgba(cr, color->r, color->g, color->b, color->a);
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22 }
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24 static void paint_color_free(redraw_man_t *rdman, paint_t *paint) {
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25 shnode_list_free(rdman, paint->members);
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26 paint_destroy(paint);
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27 elmpool_elm_free(rdman->paint_color_pool, paint);
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28 }
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30 paint_t *rdman_paint_color_new(redraw_man_t *rdman,
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31 co_comp_t r, co_comp_t g,
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32 co_comp_t b, co_comp_t a) {
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33 paint_color_t *color;
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35 color = (paint_color_t *)elmpool_elm_alloc(rdman->paint_color_pool);
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36 if(color == NULL)
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37 return NULL;
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38 color->r = r;
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39 color->g = g;
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40 color->b = b;
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41 color->a = a;
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42 paint_init(&color->paint, MBP_COLOR,
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43 paint_color_prepare, paint_color_free);
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44 return (paint_t *)color;
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45 }
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46
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47 void paint_color_set(paint_t *paint,
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48 co_comp_t r, co_comp_t g,
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49 co_comp_t b, co_comp_t a) {
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50 paint_color_t *color = (paint_color_t *)paint;
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51
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52 color->r = r;
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53 color->g = g;
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54 color->b = b;
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55 color->a = a;
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56 }
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57
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58 void paint_color_get(paint_t *paint,
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59 co_comp_t *r, co_comp_t *g,
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60 co_comp_t *b, co_comp_t *a) {
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61 paint_color_t *color = (paint_color_t *)paint;
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62
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63 *r = color->r;
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64 *g = color->g;
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65 *b = color->b;
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66 *a = color->a;
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67 }
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68
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69 /*! \brief Linear gradient.
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70 */
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71 typedef struct _paint_linear {
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72 paint_t paint;
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73 co_aix x1, y1;
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74 co_aix x2, y2;
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75 int n_stops;
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76 grad_stop_t *stops;
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77 int flags;
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78 mbe_pattern_t *ptn;
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79 } paint_linear_t;
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80
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81 #define LIF_DIRTY 0x1
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82
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83 static void paint_linear_prepare(paint_t *paint, mbe_t *cr) {
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84 paint_linear_t *linear = (paint_linear_t *)paint;
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85 mbe_pattern_t *ptn;
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86
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87 ptn = linear->ptn;
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88 if(linear->flags & LIF_DIRTY) {
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89 if(ptn)
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90 mbe_pattern_destroy(ptn);
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91 linear->flags &= ~LIF_DIRTY;
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92 ptn = mbe_pattern_create_linear(linear->x1, linear->y1,
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93 linear->x2, linear->y2,
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94 linear->stops, linear->n_stops);
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95 ASSERT(ptn != NULL);
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96 linear->ptn = ptn;
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97 }
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98
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99 mbe_set_source(cr, ptn);
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100 }
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101
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102 static void paint_linear_free(redraw_man_t *rdman, paint_t *paint) {
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103 paint_linear_t *linear = (paint_linear_t *)paint;
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104
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105 if(linear->ptn)
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106 mbe_pattern_destroy(linear->ptn);
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107 paint_destroy(paint);
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108 free(paint);
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109 }
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110
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111 paint_t *rdman_paint_linear_new(redraw_man_t *rdman,
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112 co_aix x1, co_aix y1,
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113 co_aix x2, co_aix y2) {
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114 paint_linear_t *linear;
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115
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116 linear = (paint_linear_t *)malloc(sizeof(paint_linear_t));
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117 if(linear == NULL)
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118 return NULL;
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119
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120 paint_init(&linear->paint, MBP_LINEAR,
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121 paint_linear_prepare, paint_linear_free);
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122
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123 linear->x1 = x1;
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124 linear->y1 = y1;
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125 linear->x2 = x2;
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126 linear->y2 = y2;
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127 linear->n_stops = 0;
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128 linear->stops = NULL;
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129 linear->flags = LIF_DIRTY;
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130 linear->ptn = NULL;
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131
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132 return (paint_t *)linear;
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133 }
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134
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135 /*! \brief Setup color stop for a linear radient paint.
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136 *
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137 * stops should be managed by users of the function. It should be
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138 * available before the paint being freed or changed to another
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139 * array of stops.
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140 */
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141 grad_stop_t *paint_linear_stops(paint_t *paint,
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142 int n_stops,
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143 grad_stop_t *stops) {
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144 paint_linear_t *linear = (paint_linear_t *)paint;
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145 grad_stop_t *old_stops;
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146
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147 old_stops = linear->stops;
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148 linear->n_stops = n_stops;
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149 linear->stops = stops;
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150 linear->flags |= LIF_DIRTY;
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151
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152 return old_stops;
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153 }
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154
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155 /*! \brief Radial gradient.
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156 *
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157 * NOTE: The only supported gradient unit is userSpaceOnUse.
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158 */
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159 typedef struct _paint_radial {
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160 paint_t paint;
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161 co_aix cx, cy;
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162 co_aix r;
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163 int n_stops;
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164 grad_stop_t *stops;
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165 int flags;
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166 mbe_pattern_t *ptn;
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167 } paint_radial_t;
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168
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169 #define RDF_DIRTY 0x1
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170
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171 static void paint_radial_prepare(paint_t *paint, mbe_t *cr) {
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172 paint_radial_t *radial = (paint_radial_t *)paint;
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173 mbe_pattern_t *ptn;
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174
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175 if(radial->flags & RDF_DIRTY) {
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176 ptn = mbe_pattern_create_radial(radial->cx, radial->cy, 0,
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177 radial->cx, radial->cy,
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178 radial->r,
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179 radial->stops,
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180 radial->n_stops);
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181 ASSERT(ptn != NULL);
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182 mbe_pattern_destroy(radial->ptn);
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183 radial->ptn = ptn;
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184 }
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185 mbe_set_source(cr, radial->ptn);
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186 }
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187
159
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188 static void paint_radial_free(redraw_man_t *rdman, paint_t *paint) {
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189 paint_radial_t *radial = (paint_radial_t *)paint;
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190
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191 if(radial->ptn)
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192 mbe_pattern_destroy(radial->ptn);
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193 paint_destroy(paint);
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194 free(paint);
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195 }
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196
159
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197 paint_t *rdman_paint_radial_new(redraw_man_t *rdman,
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198 co_aix cx, co_aix cy, co_aix r) {
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199 paint_radial_t *radial;
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200
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201 radial = O_ALLOC(paint_radial_t);
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202 if(radial == NULL)
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203 return NULL;
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204
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205 paint_init(&radial->paint, MBP_RADIAL,
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206 paint_radial_prepare, paint_radial_free);
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207 radial->cx = cx;
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208 radial->cy = cy;
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209 radial->r = r;
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210 radial->n_stops = 0;
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211 radial->stops = NULL;
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212 radial->flags = RDF_DIRTY;
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213 radial->ptn = NULL;
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214
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215 return (paint_t *)radial;
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216 }
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217
58
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218 /*! \brief Setup color stop for a radial radient paint.
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219 *
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220 * stops should be managed by users of the function. It should be
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221 * available before the paint being freed or changed to another
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222 * array of stops.
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223 */
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224 grad_stop_t *paint_radial_stops(paint_t *paint,
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225 int n_stops,
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226 grad_stop_t *stops) {
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227 paint_radial_t *radial = (paint_radial_t *)paint;
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228 grad_stop_t *old_stops;
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229
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230 old_stops = radial->stops;
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231 radial->n_stops = n_stops;
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232 radial->stops = stops;
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233 radial->flags |= RDF_DIRTY;
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234
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235 return old_stops;
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236 }
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237
260
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238
265
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239 /*! \brief Using an image as a paint.
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240 *
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241 * This type of paints fill/stroke shapes with an image.
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242 */
260
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243 typedef struct _paint_image {
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244 paint_t paint;
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245 mb_img_data_t *img;
448
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246 mbe_surface_t *surf;
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247 mbe_pattern_t *ptn;
260
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248 } paint_image_t;
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249
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250 static
448
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251 void paint_image_prepare(paint_t *paint, mbe_t *cr) {
260
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252 paint_image_t *paint_img = (paint_image_t *)paint;
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253 mb_img_data_t *img_data;
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254
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255 img_data = paint_img->img;
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256 mbe_set_source(cr, paint_img->ptn);
260
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257 }
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258
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259 static
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260 void paint_image_free(redraw_man_t *rdman, paint_t *paint) {
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261 paint_image_t *paint_img = (paint_image_t *)paint;
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262 mb_img_data_t *img_data;
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263
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264 mbe_surface_destroy(paint_img->surf);
260
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265 img_data = paint_img->img;
356
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266 MB_IMG_DATA_FREE(img_data);
260
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267 paint_destroy(&paint_img->paint);
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268 free(paint);
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269 }
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270
265
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271 /*! \brief Create an image painter.
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272 *
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273 * Create a painter that fill/stroke shapes with an image.
348
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274 *
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275 * \param img is image data return by image load.
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276 * Owner-ship of img is transfered.
265
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277 */
260
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diff changeset
278 paint_t *rdman_paint_image_new(redraw_man_t *rdman,
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279 mb_img_data_t *img) {
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280 paint_image_t *paint;
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281
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282 paint = O_ALLOC(paint_image_t);
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283 if(paint == NULL)
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284 return NULL;
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285
356
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286 paint_init(&paint->paint, MBP_IMAGE,
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287 paint_image_prepare, paint_image_free);
260
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288 paint->img = img;
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289 paint->surf = mbe_image_surface_create_for_data(img->content,
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290 img->fmt,
268
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291 img->w,
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292 img->h,
260
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293 img->stride);
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294 if(paint->surf == NULL) {
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295 paint_destroy(&paint->paint);
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296 free(paint);
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297 return NULL;
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298 }
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299
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300 paint->ptn = mbe_pattern_create_for_surface(paint->surf);
260
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301 if(paint->ptn == NULL) {
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302 paint_destroy(&paint->paint);
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303 mbe_surface_destroy(paint->surf);
260
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304 free(paint);
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305 return NULL;
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306 }
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307
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308 return (paint_t *)paint;
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309 }
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310
265
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311 /*! \brief Setting transformation from user space to image space.
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312 *
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313 * This transformation matrix maps points drawed in user space to
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314 * corresponding points in image space. It is used to resample
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315 * the image to generate pixels of result image.
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316 */
260
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317 void paint_image_set_matrix(paint_t *paint, co_aix matrix[6]) {
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318 paint_image_t *img_paint = (paint_image_t *)paint;
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319
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320 mbe_pattern_set_matrix(img_paint->ptn, matrix);
260
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321 }
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322
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323 void paint_image_get_size(paint_t *paint, int *w, int *h) {
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324 paint_image_t *ipaint = (paint_image_t *)paint;
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325
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326 ASSERT(paint->pnt_type == MBP_IMAGE);
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327 *w = ipaint->img->w;
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328 *h = ipaint->img->h;
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329 }