1 | /* vim: set sw=4: -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */ |
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2 | /* |
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3 | rsvg-paint-server.c: Implement the SVG paint server abstraction. |
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4 | |
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5 | Copyright (C) 2000 Eazel, Inc. |
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6 | |
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7 | This program is free software; you can redistribute it and/or |
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8 | modify it under the terms of the GNU Library General Public License as |
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9 | published by the Free Software Foundation; either version 2 of the |
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10 | License, or (at your option) any later version. |
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11 | |
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12 | This program is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | Library General Public License for more details. |
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16 | |
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17 | You should have received a copy of the GNU Library General Public |
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18 | License along with this program; if not, write to the |
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19 | Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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20 | Boston, MA 02111-1307, USA. |
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21 | |
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22 | Author: Raph Levien <raph@artofcode.com> |
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23 | */ |
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24 | |
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25 | #include "config.h" |
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26 | #include "rsvg-paint-server.h" |
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27 | #include "rsvg-private.h" |
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28 | |
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29 | #include <glib/gmem.h> |
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30 | #include <glib/gmessages.h> |
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31 | #include <glib/gstrfuncs.h> |
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32 | #include <libart_lgpl/art_affine.h> |
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33 | #include <string.h> |
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34 | #include <math.h> |
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35 | |
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36 | #include "rsvg-css.h" |
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37 | |
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38 | typedef struct _RsvgPaintServerSolid RsvgPaintServerSolid; |
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39 | typedef struct _RsvgPaintServerLinGrad RsvgPaintServerLinGrad; |
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40 | typedef struct _RsvgPaintServerRadGrad RsvgPaintServerRadGrad; |
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41 | |
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42 | struct _RsvgPaintServer { |
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43 | int refcnt; |
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44 | void (*free) (RsvgPaintServer *self); |
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45 | void (*render) (RsvgPaintServer *self, ArtRender *ar, const RsvgPSCtx *ctx); |
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46 | }; |
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47 | |
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48 | struct _RsvgPaintServerSolid { |
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49 | RsvgPaintServer super; |
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50 | guint32 rgb; |
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51 | }; |
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52 | |
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53 | struct _RsvgPaintServerLinGrad { |
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54 | RsvgPaintServer super; |
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55 | RsvgLinearGradient *gradient; |
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56 | ArtGradientLinear *agl; |
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57 | }; |
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58 | |
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59 | struct _RsvgPaintServerRadGrad { |
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60 | RsvgPaintServer super; |
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61 | RsvgRadialGradient *gradient; |
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62 | ArtGradientRadial *agr; |
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63 | }; |
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64 | |
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65 | static void |
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66 | rsvg_paint_server_solid_free (RsvgPaintServer *self) |
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67 | { |
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68 | g_free (self); |
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69 | } |
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70 | |
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71 | static void |
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72 | rsvg_paint_server_solid_render (RsvgPaintServer *self, ArtRender *ar, |
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73 | const RsvgPSCtx *ctx) |
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74 | { |
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75 | RsvgPaintServerSolid *z = (RsvgPaintServerSolid *)self; |
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76 | guint32 rgb = z->rgb; |
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77 | ArtPixMaxDepth color[3]; |
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78 | |
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79 | color[0] = ART_PIX_MAX_FROM_8 (rgb >> 16); |
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80 | color[1] = ART_PIX_MAX_FROM_8 ((rgb >> 8) & 0xff); |
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81 | color[2] = ART_PIX_MAX_FROM_8 (rgb & 0xff); |
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82 | |
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83 | art_render_image_solid (ar, color); |
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84 | } |
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85 | |
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86 | static RsvgPaintServer * |
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87 | rsvg_paint_server_solid (guint32 rgb) |
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88 | { |
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89 | RsvgPaintServerSolid *result = g_new (RsvgPaintServerSolid, 1); |
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90 | |
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91 | result->super.refcnt = 1; |
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92 | result->super.free = rsvg_paint_server_solid_free; |
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93 | result->super.render = rsvg_paint_server_solid_render; |
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94 | |
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95 | result->rgb = rgb; |
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96 | |
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97 | return &result->super; |
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98 | } |
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99 | |
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100 | static void |
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101 | rsvg_paint_server_lin_grad_free (RsvgPaintServer *self) |
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102 | { |
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103 | RsvgPaintServerLinGrad *z = (RsvgPaintServerLinGrad *)self; |
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104 | |
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105 | if (z->agl) |
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106 | g_free (z->agl->stops); |
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107 | g_free (z->agl); |
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108 | g_free (self); |
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109 | } |
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110 | |
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111 | static ArtGradientStop * |
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112 | rsvg_paint_art_stops_from_rsvg (RsvgGradientStops *rstops) |
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113 | { |
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114 | ArtGradientStop *stops; |
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115 | int n_stop = rstops->n_stop; |
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116 | int i; |
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117 | |
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118 | stops = g_new (ArtGradientStop, n_stop); |
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119 | for (i = 0; i < n_stop; i++) |
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120 | { |
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121 | guint32 rgba; |
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122 | guint32 r, g, b, a; |
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123 | |
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124 | stops[i].offset = rstops->stop[i].offset; |
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125 | rgba = rstops->stop[i].rgba; |
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126 | /* convert from separated to premultiplied alpha */ |
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127 | a = rgba & 0xff; |
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128 | r = (rgba >> 24) * a + 0x80; |
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129 | r = (r + (r >> 8)) >> 8; |
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130 | g = ((rgba >> 16) & 0xff) * a + 0x80; |
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131 | g = (g + (g >> 8)) >> 8; |
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132 | b = ((rgba >> 8) & 0xff) * a + 0x80; |
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133 | b = (b + (b >> 8)) >> 8; |
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134 | stops[i].color[0] = ART_PIX_MAX_FROM_8(r); |
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135 | stops[i].color[1] = ART_PIX_MAX_FROM_8(g); |
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136 | stops[i].color[2] = ART_PIX_MAX_FROM_8(b); |
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137 | stops[i].color[3] = ART_PIX_MAX_FROM_8(a); |
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138 | } |
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139 | return stops; |
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140 | } |
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141 | |
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142 | static void |
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143 | rsvg_paint_server_lin_grad_render (RsvgPaintServer *self, ArtRender *ar, |
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144 | const RsvgPSCtx *ctx) |
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145 | { |
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146 | RsvgPaintServerLinGrad *z = (RsvgPaintServerLinGrad *)self; |
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147 | RsvgLinearGradient *rlg = z->gradient; |
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148 | ArtGradientLinear *agl; |
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149 | double x1, y1, x2, y2; |
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150 | double dx, dy, scale; |
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151 | double affine[6]; |
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152 | int i; |
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153 | |
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154 | agl = z->agl; |
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155 | if (agl == NULL) |
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156 | { |
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157 | if (rlg->stops->n_stop == 0) |
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158 | { |
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159 | return; |
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160 | } |
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161 | agl = g_new (ArtGradientLinear, 1); |
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162 | agl->n_stops = rlg->stops->n_stop; |
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163 | agl->stops = rsvg_paint_art_stops_from_rsvg (rlg->stops); |
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164 | z->agl = agl; |
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165 | } |
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166 | |
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167 | if (rlg->obj_bbox) { |
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168 | affine[0] = ar->x1 - ar->x0; |
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169 | affine[1] = 0.; |
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170 | affine[2] = 0.; |
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171 | affine[3] = ar->y1 - ar->y0; |
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172 | affine[4] = ar->x0; |
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173 | affine[5] = ar->y0; |
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174 | |
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175 | art_affine_multiply (affine, affine, rlg->affine); |
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176 | } else { |
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177 | for (i = 0; i < 6; i++) |
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178 | affine[i] = rlg->affine[i]; |
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179 | } |
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180 | |
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181 | /* compute [xy][12] in pixel space */ |
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182 | x1 = rlg->x1 * affine[0] + rlg->y1 * affine[2] + affine[4]; |
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183 | y1 = rlg->x1 * affine[1] + rlg->y1 * affine[3] + affine[5]; |
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184 | x2 = rlg->x2 * affine[0] + rlg->y2 * affine[2] + affine[4]; |
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185 | y2 = rlg->x2 * affine[1] + rlg->y2 * affine[3] + affine[5]; |
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186 | |
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187 | /* solve a, b, c so ax1 + by1 + c = 0 and ax2 + by2 + c = 1, maximum |
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188 | gradient is in x1,y1 to x2,y2 dir */ |
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189 | dx = x2 - x1; |
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190 | dy = y2 - y1; |
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191 | |
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192 | /* workaround for an evil devide by 0 bug - not sure if this is sufficient */ |
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193 | if (fabs(dx + dy) <= 0.0000001) |
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194 | scale = 0.; |
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195 | else |
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196 | scale = 1.0 / (dx * dx + dy * dy); |
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197 | agl->a = dx * scale; |
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198 | agl->b = dy * scale; |
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199 | agl->c = -(x1 * agl->a + y1 * agl->b); |
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200 | |
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201 | agl->spread = rlg->spread; |
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202 | art_render_gradient_linear (ar, agl, ART_FILTER_NEAREST); |
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203 | } |
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204 | |
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205 | static RsvgPaintServer * |
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206 | rsvg_paint_server_lin_grad (RsvgLinearGradient *gradient) |
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207 | { |
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208 | RsvgPaintServerLinGrad *result = g_new (RsvgPaintServerLinGrad, 1); |
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209 | |
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210 | result->super.refcnt = 1; |
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211 | result->super.free = rsvg_paint_server_lin_grad_free; |
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212 | result->super.render = rsvg_paint_server_lin_grad_render; |
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213 | |
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214 | result->gradient = gradient; |
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215 | result->agl = NULL; |
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216 | |
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217 | return &result->super; |
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218 | } |
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219 | |
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220 | static void |
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221 | rsvg_paint_server_rad_grad_free (RsvgPaintServer *self) |
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222 | { |
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223 | RsvgPaintServerRadGrad *z = (RsvgPaintServerRadGrad *)self; |
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224 | |
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225 | if (z->agr) |
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226 | g_free (z->agr->stops); |
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227 | g_free (z->agr); |
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228 | g_free (self); |
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229 | } |
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230 | |
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231 | static void |
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232 | rsvg_paint_server_rad_grad_render (RsvgPaintServer *self, ArtRender *ar, |
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233 | const RsvgPSCtx *ctx) |
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234 | { |
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235 | RsvgPaintServerRadGrad *z = (RsvgPaintServerRadGrad *)self; |
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236 | RsvgRadialGradient *rrg = z->gradient; |
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237 | ArtGradientRadial *agr; |
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238 | double aff1[6], aff2[6], affine[6]; |
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239 | int i; |
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240 | |
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241 | if (rrg->obj_bbox) { |
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242 | affine[0] = ar->x1 - ar->x0; |
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243 | affine[1] = 0.; |
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244 | affine[2] = 0.; |
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245 | affine[3] = ar->y1 - ar->y0; |
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246 | affine[4] = ar->x0; |
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247 | affine[5] = ar->y0; |
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248 | |
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249 | art_affine_multiply (affine, affine, rrg->affine); |
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250 | } else { |
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251 | for (i = 0; i < 6; i++) |
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252 | affine[i] = rrg->affine[i]; |
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253 | } |
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254 | |
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255 | agr = z->agr; |
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256 | if (agr == NULL) |
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257 | { |
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258 | if (rrg->stops->n_stop == 0) |
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259 | { |
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260 | return; |
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261 | } |
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262 | agr = g_new (ArtGradientRadial, 1); |
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263 | agr->n_stops = rrg->stops->n_stop; |
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264 | agr->stops = rsvg_paint_art_stops_from_rsvg (rrg->stops); |
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265 | z->agr = agr; |
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266 | } |
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267 | |
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268 | art_affine_scale (aff1, rrg->r, rrg->r); |
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269 | art_affine_translate (aff2, rrg->cx, rrg->cy); |
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270 | art_affine_multiply (aff1, aff1, aff2); |
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271 | art_affine_multiply (aff1, aff1, affine); |
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272 | art_affine_invert (agr->affine, aff1); |
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273 | |
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274 | /* todo: libart doesn't support spreads on radial gradients */ |
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275 | |
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276 | agr->fx = (rrg->fx - rrg->cx) / rrg->r; |
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277 | agr->fy = (rrg->fy - rrg->cy) / rrg->r; |
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278 | |
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279 | art_render_gradient_radial (ar, agr, ART_FILTER_NEAREST); |
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280 | } |
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281 | |
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282 | static RsvgPaintServer * |
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283 | rsvg_paint_server_rad_grad (RsvgRadialGradient *gradient) |
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284 | { |
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285 | RsvgPaintServerRadGrad *result = g_new (RsvgPaintServerRadGrad, 1); |
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286 | |
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287 | result->super.refcnt = 1; |
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288 | result->super.free = rsvg_paint_server_rad_grad_free; |
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289 | result->super.render = rsvg_paint_server_rad_grad_render; |
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290 | |
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291 | result->gradient = gradient; |
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292 | result->agr = NULL; |
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293 | |
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294 | return &result->super; |
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295 | } |
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296 | |
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297 | /** |
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298 | * rsvg_paint_server_parse: Parse an SVG paint specification. |
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299 | * @defs: Defs for looking up gradients. |
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300 | * @str: The SVG paint specification string to parse. |
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301 | * |
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302 | * Parses the paint specification @str, creating a new paint server |
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303 | * object. |
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304 | * |
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305 | * Return value: The newly created paint server, or NULL on error. |
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306 | **/ |
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307 | RsvgPaintServer * |
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308 | rsvg_paint_server_parse (const RsvgDefs *defs, const char *str) |
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309 | { |
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310 | guint32 rgb; |
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311 | |
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312 | if (!strcmp (str, "none")) |
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313 | return NULL; |
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314 | if (!strncmp (str, "url(", 4)) |
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315 | { |
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316 | const char *p = str + 4; |
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317 | int ix; |
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318 | char *name; |
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319 | RsvgDefVal *val; |
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320 | |
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321 | while (g_ascii_isspace (*p)) p++; |
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322 | if (*p != '#') |
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323 | return NULL; |
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324 | p++; |
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325 | for (ix = 0; p[ix]; ix++) |
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326 | if (p[ix] == ')') break; |
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327 | if (p[ix] != ')') |
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328 | return NULL; |
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329 | name = g_strndup (p, ix); |
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330 | val = rsvg_defs_lookup (defs, name); |
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331 | g_free (name); |
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332 | if (val == NULL) |
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333 | return NULL; |
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334 | switch (val->type) |
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335 | { |
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336 | case RSVG_DEF_LINGRAD: |
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337 | return rsvg_paint_server_lin_grad ((RsvgLinearGradient *)val); |
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338 | case RSVG_DEF_RADGRAD: |
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339 | return rsvg_paint_server_rad_grad ((RsvgRadialGradient *)val); |
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340 | default: |
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341 | return NULL; |
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342 | } |
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343 | } |
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344 | else |
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345 | { |
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346 | rgb = rsvg_css_parse_color (str); |
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347 | return rsvg_paint_server_solid (rgb); |
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348 | } |
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349 | } |
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350 | |
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351 | /** |
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352 | * rsvg_render_paint_server: Render paint server as image source for libart. |
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353 | * @ar: Libart render object. |
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354 | * @ps: Paint server object. |
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355 | * |
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356 | * Hooks up @ps as an image source for a libart rendering operation. |
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357 | **/ |
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358 | void |
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359 | rsvg_render_paint_server (ArtRender *ar, RsvgPaintServer *ps, |
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360 | const RsvgPSCtx *ctx) |
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361 | { |
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362 | g_return_if_fail (ar != NULL); |
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363 | if (ps != NULL) |
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364 | ps->render (ps, ar, ctx); |
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365 | } |
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366 | |
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367 | /** |
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368 | * rsvg_paint_server_ref: Reference a paint server object. |
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369 | * @ps: The paint server object to reference. |
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370 | **/ |
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371 | void |
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372 | rsvg_paint_server_ref (RsvgPaintServer *ps) |
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373 | { |
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374 | if (ps == NULL) |
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375 | return; |
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376 | ps->refcnt++; |
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377 | } |
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378 | |
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379 | /** |
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380 | * rsvg_paint_server_unref: Unreference a paint server object. |
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381 | * @ps: The paint server object to unreference. |
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382 | **/ |
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383 | void |
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384 | rsvg_paint_server_unref (RsvgPaintServer *ps) |
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385 | { |
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386 | if (ps == NULL) |
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387 | return; |
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388 | if (--ps->refcnt == 0) |
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389 | ps->free (ps); |
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390 | } |
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391 | |
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392 | RsvgRadialGradient * |
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393 | rsvg_clone_radial_gradient (const RsvgRadialGradient *grad, gboolean * shallow_cloned) |
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394 | { |
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395 | RsvgRadialGradient * clone = NULL; |
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396 | int i; |
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397 | |
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398 | clone = g_new0 (RsvgRadialGradient, 1); |
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399 | clone->super.type = RSVG_DEF_RADGRAD; |
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400 | clone->super.free = rsvg_radial_gradient_free; |
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401 | |
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402 | clone->obj_bbox = grad->obj_bbox; |
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403 | for (i = 0; i < 6; i++) |
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404 | clone->affine[i] = grad->affine[i]; |
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405 | |
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406 | if (grad->stops != NULL) { |
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407 | clone->stops = g_new (RsvgGradientStops, 1); |
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408 | clone->stops->n_stop = grad->stops->n_stop; |
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409 | clone->stops->stop = g_new (RsvgGradientStop, grad->stops->n_stop); |
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410 | |
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411 | for (i = 0; i < grad->stops->n_stop; i++) |
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412 | clone->stops->stop[i] = grad->stops->stop[i]; |
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413 | } |
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414 | |
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415 | clone->spread = grad->spread; |
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416 | |
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417 | /* EVIL EVIL - SVG can base LinearGradients on |
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418 | RadialGradients, and vice-versa. it is legal, though: |
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419 | http://www.w3.org/TR/SVG11/pservers.html#LinearGradients |
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420 | */ |
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421 | if (grad->super.type == RSVG_DEF_RADGRAD) { |
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422 | clone->cx = grad->cx; |
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423 | clone->cy = grad->cy; |
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424 | clone->r = grad->r; |
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425 | clone->fx = grad->fx; |
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426 | clone->fy = grad->fy; |
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427 | |
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428 | *shallow_cloned = FALSE; |
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429 | } else { |
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430 | *shallow_cloned = TRUE; |
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431 | } |
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432 | |
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433 | return clone; |
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434 | } |
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435 | |
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436 | RsvgLinearGradient * |
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437 | rsvg_clone_linear_gradient (const RsvgLinearGradient *grad, gboolean * shallow_cloned) |
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438 | { |
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439 | RsvgLinearGradient * clone = NULL; |
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440 | int i; |
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441 | |
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442 | clone = g_new0 (RsvgLinearGradient, 1); |
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443 | clone->super.type = RSVG_DEF_LINGRAD; |
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444 | clone->super.free = rsvg_linear_gradient_free; |
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445 | |
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446 | clone->obj_bbox = grad->obj_bbox; |
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447 | for (i = 0; i < 6; i++) |
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448 | clone->affine[i] = grad->affine[i]; |
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449 | |
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450 | if (grad->stops != NULL) { |
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451 | clone->stops = g_new (RsvgGradientStops, 1); |
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452 | clone->stops->n_stop = grad->stops->n_stop; |
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453 | clone->stops->stop = g_new (RsvgGradientStop, grad->stops->n_stop); |
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454 | |
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455 | for (i = 0; i < grad->stops->n_stop; i++) |
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456 | clone->stops->stop[i] = grad->stops->stop[i]; |
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457 | } |
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458 | |
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459 | clone->spread = grad->spread; |
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460 | |
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461 | /* EVIL EVIL - SVG can base LinearGradients on |
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462 | RadialGradients, and vice-versa. it is legal, though: |
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463 | http://www.w3.org/TR/SVG11/pservers.html#LinearGradients |
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464 | */ |
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465 | if (grad->super.type == RSVG_DEF_LINGRAD) { |
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466 | clone->x1 = grad->x1; |
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467 | clone->y1 = grad->y1; |
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468 | clone->x2 = grad->x2; |
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469 | clone->y2 = grad->y2; |
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470 | |
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471 | *shallow_cloned = FALSE; |
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472 | } else { |
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473 | *shallow_cloned = TRUE; |
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474 | } |
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475 | |
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476 | return clone; |
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477 | } |
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