1 | /* |
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2 | rsvg-paint-server.c: Implement the SVG paint server abstraction. |
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3 | |
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4 | Copyright (C) 2000 Eazel, Inc. |
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5 | |
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6 | This program is free software; you can redistribute it and/or |
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7 | modify it under the terms of the GNU Library General Public License as |
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8 | published by the Free Software Foundation; either version 2 of the |
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9 | License, or (at your option) any later version. |
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10 | |
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11 | This program is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | Library General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU Library General Public |
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17 | License along with this program; if not, write to the |
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18 | Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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19 | Boston, MA 02111-1307, USA. |
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20 | |
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21 | Author: Raph Levien <raph@artofcode.com> |
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22 | */ |
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23 | |
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24 | #include "config.h" |
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25 | #include "rsvg-paint-server.h" |
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26 | |
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27 | #include <glib/gmem.h> |
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28 | #include <glib/gmessages.h> |
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29 | #include <glib/gstrfuncs.h> |
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30 | #include <libart_lgpl/art_affine.h> |
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31 | #include <string.h> |
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32 | #include "rsvg-css.h" |
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33 | |
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34 | typedef struct _RsvgPaintServerSolid RsvgPaintServerSolid; |
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35 | typedef struct _RsvgPaintServerLinGrad RsvgPaintServerLinGrad; |
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36 | typedef struct _RsvgPaintServerRadGrad RsvgPaintServerRadGrad; |
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37 | |
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38 | struct _RsvgPaintServer { |
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39 | int refcnt; |
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40 | void (*free) (RsvgPaintServer *self); |
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41 | void (*render) (RsvgPaintServer *self, ArtRender *ar, const RsvgPSCtx *ctx); |
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42 | }; |
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43 | |
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44 | struct _RsvgPaintServerSolid { |
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45 | RsvgPaintServer super; |
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46 | guint32 rgb; |
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47 | }; |
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48 | |
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49 | struct _RsvgPaintServerLinGrad { |
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50 | RsvgPaintServer super; |
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51 | RsvgLinearGradient *gradient; |
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52 | ArtGradientLinear *agl; |
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53 | }; |
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54 | |
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55 | struct _RsvgPaintServerRadGrad { |
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56 | RsvgPaintServer super; |
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57 | RsvgRadialGradient *gradient; |
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58 | ArtGradientRadial *agr; |
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59 | }; |
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60 | |
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61 | static void |
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62 | rsvg_paint_server_solid_free (RsvgPaintServer *self) |
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63 | { |
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64 | g_free (self); |
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65 | } |
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66 | |
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67 | static void |
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68 | rsvg_paint_server_solid_render (RsvgPaintServer *self, ArtRender *ar, |
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69 | const RsvgPSCtx *ctx) |
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70 | { |
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71 | RsvgPaintServerSolid *z = (RsvgPaintServerSolid *)self; |
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72 | guint32 rgb = z->rgb; |
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73 | ArtPixMaxDepth color[3]; |
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74 | |
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75 | color[0] = ART_PIX_MAX_FROM_8 (rgb >> 16); |
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76 | color[1] = ART_PIX_MAX_FROM_8 ((rgb >> 8) & 0xff); |
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77 | color[2] = ART_PIX_MAX_FROM_8 (rgb & 0xff); |
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78 | |
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79 | art_render_image_solid (ar, color); |
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80 | } |
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81 | |
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82 | static RsvgPaintServer * |
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83 | rsvg_paint_server_solid (guint32 rgb) |
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84 | { |
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85 | RsvgPaintServerSolid *result = g_new (RsvgPaintServerSolid, 1); |
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86 | |
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87 | result->super.refcnt = 1; |
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88 | result->super.free = rsvg_paint_server_solid_free; |
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89 | result->super.render = rsvg_paint_server_solid_render; |
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90 | |
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91 | result->rgb = rgb; |
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92 | |
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93 | return &result->super; |
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94 | } |
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95 | |
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96 | static void |
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97 | rsvg_paint_server_lin_grad_free (RsvgPaintServer *self) |
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98 | { |
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99 | RsvgPaintServerLinGrad *z = (RsvgPaintServerLinGrad *)self; |
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100 | |
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101 | if (z->agl) |
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102 | g_free (z->agl->stops); |
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103 | g_free (z->agl); |
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104 | g_free (self); |
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105 | } |
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106 | |
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107 | static ArtGradientStop * |
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108 | rsvg_paint_art_stops_from_rsvg (RsvgGradientStops *rstops) |
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109 | { |
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110 | ArtGradientStop *stops; |
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111 | int n_stop = rstops->n_stop; |
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112 | int i; |
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113 | |
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114 | stops = g_new (ArtGradientStop, n_stop); |
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115 | for (i = 0; i < n_stop; i++) |
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116 | { |
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117 | guint32 rgba; |
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118 | guint32 r, g, b, a; |
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119 | |
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120 | stops[i].offset = rstops->stop[i].offset; |
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121 | rgba = rstops->stop[i].rgba; |
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122 | /* convert from separated to premultiplied alpha */ |
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123 | a = rgba & 0xff; |
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124 | r = (rgba >> 24) * a + 0x80; |
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125 | r = (r + (r >> 8)) >> 8; |
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126 | g = ((rgba >> 16) & 0xff) * a + 0x80; |
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127 | g = (g + (g >> 8)) >> 8; |
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128 | b = ((rgba >> 8) & 0xff) * a + 0x80; |
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129 | b = (b + (b >> 8)) >> 8; |
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130 | stops[i].color[0] = ART_PIX_MAX_FROM_8(r); |
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131 | stops[i].color[1] = ART_PIX_MAX_FROM_8(g); |
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132 | stops[i].color[2] = ART_PIX_MAX_FROM_8(b); |
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133 | stops[i].color[3] = ART_PIX_MAX_FROM_8(a); |
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134 | } |
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135 | return stops; |
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136 | } |
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137 | |
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138 | static void |
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139 | rsvg_paint_server_lin_grad_render (RsvgPaintServer *self, ArtRender *ar, |
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140 | const RsvgPSCtx *ctx) |
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141 | { |
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142 | RsvgPaintServerLinGrad *z = (RsvgPaintServerLinGrad *)self; |
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143 | RsvgLinearGradient *rlg = z->gradient; |
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144 | ArtGradientLinear *agl; |
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145 | double x1, y1, x2, y2; |
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146 | double dx, dy, scale; |
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147 | |
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148 | agl = z->agl; |
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149 | if (agl == NULL) |
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150 | { |
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151 | if (rlg->stops->n_stop == 0) |
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152 | { |
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153 | /* g_warning ("gradient with no stops -- should be rejected by parser"); */ |
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154 | return; |
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155 | } |
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156 | agl = g_new (ArtGradientLinear, 1); |
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157 | agl->n_stops = rlg->stops->n_stop; |
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158 | agl->stops = rsvg_paint_art_stops_from_rsvg (rlg->stops); |
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159 | z->agl = agl; |
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160 | } |
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161 | |
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162 | /* compute [xy][12] in pixel space */ |
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163 | /* todo: this code implicitly implements gradientUnits = userSpace */ |
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164 | x1 = rlg->x1 * rlg->affine[0] + rlg->y1 * rlg->affine[2] + rlg->affine[4]; |
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165 | y1 = rlg->x1 * rlg->affine[1] + rlg->y1 * rlg->affine[3] + rlg->affine[5]; |
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166 | x2 = rlg->x2 * rlg->affine[0] + rlg->y2 * rlg->affine[2] + rlg->affine[4]; |
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167 | y2 = rlg->x2 * rlg->affine[1] + rlg->y2 * rlg->affine[3] + rlg->affine[5]; |
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168 | |
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169 | /* solve a, b, c so ax1 + by1 + c = 0 and ax2 + by2 + c = 1, maximum |
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170 | gradient is in x1,y1 to x2,y2 dir */ |
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171 | dx = x2 - x1; |
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172 | dy = y2 - y1; |
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173 | scale = 1.0 / (dx * dx + dy * dy); |
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174 | agl->a = dx * scale; |
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175 | agl->b = dy * scale; |
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176 | agl->c = -(x1 * agl->a + y1 * agl->b); |
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177 | |
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178 | agl->spread = rlg->spread; |
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179 | art_render_gradient_linear (ar, agl, ART_FILTER_NEAREST); |
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180 | } |
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181 | |
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182 | static RsvgPaintServer * |
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183 | rsvg_paint_server_lin_grad (RsvgLinearGradient *gradient) |
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184 | { |
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185 | RsvgPaintServerLinGrad *result = g_new (RsvgPaintServerLinGrad, 1); |
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186 | |
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187 | result->super.refcnt = 1; |
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188 | result->super.free = rsvg_paint_server_lin_grad_free; |
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189 | result->super.render = rsvg_paint_server_lin_grad_render; |
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190 | |
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191 | result->gradient = gradient; |
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192 | result->agl = NULL; |
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193 | |
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194 | return &result->super; |
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195 | } |
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196 | |
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197 | static void |
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198 | rsvg_paint_server_rad_grad_free (RsvgPaintServer *self) |
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199 | { |
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200 | RsvgPaintServerRadGrad *z = (RsvgPaintServerRadGrad *)self; |
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201 | |
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202 | if (z->agr) |
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203 | g_free (z->agr->stops); |
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204 | g_free (z->agr); |
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205 | g_free (self); |
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206 | } |
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207 | |
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208 | static void |
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209 | rsvg_paint_server_rad_grad_render (RsvgPaintServer *self, ArtRender *ar, |
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210 | const RsvgPSCtx *ctx) |
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211 | { |
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212 | RsvgPaintServerRadGrad *z = (RsvgPaintServerRadGrad *)self; |
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213 | RsvgRadialGradient *rrg = z->gradient; |
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214 | ArtGradientRadial *agr; |
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215 | double aff1[6], aff2[6]; |
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216 | |
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217 | agr = z->agr; |
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218 | if (agr == NULL) |
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219 | { |
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220 | if (rrg->stops->n_stop == 0) |
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221 | { |
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222 | /* g_warning ("gradient with no stops -- should be rejected by parser"); */ |
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223 | return; |
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224 | } |
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225 | agr = g_new (ArtGradientRadial, 1); |
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226 | agr->n_stops = rrg->stops->n_stop; |
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227 | agr->stops = rsvg_paint_art_stops_from_rsvg (rrg->stops); |
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228 | z->agr = agr; |
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229 | } |
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230 | |
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231 | /* todo: this code implicitly implements gradientUnits = userSpace */ |
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232 | art_affine_scale (aff1, rrg->r, rrg->r); |
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233 | art_affine_translate (aff2, rrg->cx, rrg->cy); |
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234 | art_affine_multiply (aff1, aff1, aff2); |
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235 | art_affine_multiply (aff1, aff1, rrg->affine); |
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236 | art_affine_invert (agr->affine, aff1); |
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237 | |
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238 | agr->fx = (rrg->fx - rrg->cx) / rrg->r; |
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239 | agr->fy = (rrg->fy - rrg->cy) / rrg->r; |
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240 | |
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241 | art_render_gradient_radial (ar, agr, ART_FILTER_NEAREST); |
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242 | } |
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243 | |
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244 | static RsvgPaintServer * |
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245 | rsvg_paint_server_rad_grad (RsvgRadialGradient *gradient) |
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246 | { |
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247 | RsvgPaintServerRadGrad *result = g_new (RsvgPaintServerRadGrad, 1); |
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248 | |
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249 | result->super.refcnt = 1; |
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250 | result->super.free = rsvg_paint_server_rad_grad_free; |
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251 | result->super.render = rsvg_paint_server_rad_grad_render; |
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252 | |
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253 | result->gradient = gradient; |
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254 | result->agr = NULL; |
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255 | |
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256 | return &result->super; |
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257 | } |
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258 | |
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259 | /** |
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260 | * rsvg_paint_server_parse: Parse an SVG paint specification. |
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261 | * @defs: Defs for looking up gradients. |
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262 | * @str: The SVG paint specification string to parse. |
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263 | * |
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264 | * Parses the paint specification @str, creating a new paint server |
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265 | * object. |
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266 | * |
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267 | * Return value: The newly created paint server, or NULL on error. |
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268 | **/ |
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269 | RsvgPaintServer * |
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270 | rsvg_paint_server_parse (const RsvgDefs *defs, const char *str) |
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271 | { |
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272 | guint32 rgb; |
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273 | |
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274 | if (!strcmp (str, "none")) |
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275 | return NULL; |
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276 | if (!strncmp (str, "url(", 4)) |
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277 | { |
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278 | const char *p = str + 4; |
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279 | int ix; |
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280 | char *name; |
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281 | RsvgDefVal *val; |
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282 | |
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283 | while (g_ascii_isspace (*p)) p++; |
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284 | if (*p != '#') |
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285 | return NULL; |
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286 | p++; |
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287 | for (ix = 0; p[ix]; ix++) |
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288 | if (p[ix] == ')') break; |
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289 | if (p[ix] != ')') |
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290 | return NULL; |
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291 | name = g_strndup (p, ix); |
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292 | val = rsvg_defs_lookup (defs, name); |
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293 | g_free (name); |
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294 | if (val == NULL) |
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295 | return NULL; |
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296 | switch (val->type) |
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297 | { |
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298 | case RSVG_DEF_LINGRAD: |
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299 | return rsvg_paint_server_lin_grad ((RsvgLinearGradient *)val); |
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300 | case RSVG_DEF_RADGRAD: |
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301 | return rsvg_paint_server_rad_grad ((RsvgRadialGradient *)val); |
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302 | default: |
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303 | return NULL; |
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304 | } |
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305 | } |
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306 | else |
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307 | { |
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308 | rgb = rsvg_css_parse_color (str); |
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309 | return rsvg_paint_server_solid (rgb); |
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310 | } |
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311 | } |
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312 | |
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313 | /** |
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314 | * rsvg_render_paint_server: Render paint server as image source for libart. |
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315 | * @ar: Libart render object. |
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316 | * @ps: Paint server object. |
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317 | * |
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318 | * Hooks up @ps as an image source for a libart rendering operation. |
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319 | **/ |
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320 | void |
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321 | rsvg_render_paint_server (ArtRender *ar, RsvgPaintServer *ps, |
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322 | const RsvgPSCtx *ctx) |
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323 | { |
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324 | g_return_if_fail (ar != NULL); |
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325 | if (ps != NULL) |
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326 | ps->render (ps, ar, ctx); |
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327 | } |
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328 | |
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329 | /** |
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330 | * rsvg_paint_server_ref: Reference a paint server object. |
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331 | * @ps: The paint server object to reference. |
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332 | **/ |
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333 | void |
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334 | rsvg_paint_server_ref (RsvgPaintServer *ps) |
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335 | { |
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336 | if (ps == NULL) |
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337 | return; |
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338 | ps->refcnt++; |
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339 | } |
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340 | |
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341 | /** |
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342 | * rsvg_paint_server_unref: Unreference a paint server object. |
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343 | * @ps: The paint server object to unreference. |
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344 | **/ |
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345 | void |
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346 | rsvg_paint_server_unref (RsvgPaintServer *ps) |
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347 | { |
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348 | if (ps == NULL) |
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349 | return; |
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350 | if (--ps->refcnt == 0) |
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351 | ps->free (ps); |
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352 | } |
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