[17276] | 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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[18274] | 7 | modify it under the terms of the GNU Library General Public License as |
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[17276] | 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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[18274] | 14 | Library General Public License for more details. |
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[17276] | 15 | |
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[18274] | 16 | You should have received a copy of the GNU Library General Public |
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[17276] | 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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[18274] | 24 | #include "config.h" |
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| 25 | #include "rsvg-paint-server.h" |
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[17276] | 26 | |
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[18274] | 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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[17276] | 30 | #include <libart_lgpl/art_affine.h> |
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[18274] | 31 | #include <string.h> |
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[17276] | 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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[18274] | 283 | while (g_ascii_isspace (*p)) p++; |
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[17276] | 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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[18274] | 324 | g_return_if_fail (ar != NULL); |
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[17276] | 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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