[18608] | 1 | /* vim: set sw=4: -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */ |
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[17276] | 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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[18274] | 8 | modify it under the terms of the GNU Library General Public License as |
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[17276] | 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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[18274] | 15 | Library General Public License for more details. |
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[17276] | 16 | |
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[18274] | 17 | You should have received a copy of the GNU Library General Public |
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[17276] | 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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[18274] | 25 | #include "config.h" |
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| 26 | #include "rsvg-paint-server.h" |
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[18608] | 27 | #include "rsvg-private.h" |
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[17276] | 28 | |
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[18274] | 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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[17276] | 32 | #include <libart_lgpl/art_affine.h> |
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[18274] | 33 | #include <string.h> |
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[18804] | 34 | #include <math.h> |
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| 35 | |
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[17276] | 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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[18608] | 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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[17276] | 46 | }; |
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| 47 | |
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| 48 | struct _RsvgPaintServerSolid { |
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[18608] | 49 | RsvgPaintServer super; |
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| 50 | guint32 rgb; |
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[17276] | 51 | }; |
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| 52 | |
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| 53 | struct _RsvgPaintServerLinGrad { |
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[18608] | 54 | RsvgPaintServer super; |
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| 55 | RsvgLinearGradient *gradient; |
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| 56 | ArtGradientLinear *agl; |
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[17276] | 57 | }; |
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| 58 | |
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| 59 | struct _RsvgPaintServerRadGrad { |
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[18608] | 60 | RsvgPaintServer super; |
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| 61 | RsvgRadialGradient *gradient; |
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| 62 | ArtGradientRadial *agr; |
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[17276] | 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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[18608] | 68 | g_free (self); |
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[17276] | 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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[18608] | 73 | const RsvgPSCtx *ctx) |
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[17276] | 74 | { |
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[18608] | 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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[17276] | 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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[18608] | 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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[17276] | 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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[18608] | 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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[17276] | 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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[18608] | 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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[17276] | 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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[18608] | 144 | const RsvgPSCtx *ctx) |
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[17276] | 145 | { |
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[18608] | 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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[18804] | 151 | double affine[6]; |
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| 152 | int i; |
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| 153 | |
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[18608] | 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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[18804] | 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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[18608] | 180 | |
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| 181 | /* compute [xy][12] in pixel space */ |
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[18804] | 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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[18608] | 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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[18804] | 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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[18608] | 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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[17276] | 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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[18608] | 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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[17276] | 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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[18608] | 223 | RsvgPaintServerRadGrad *z = (RsvgPaintServerRadGrad *)self; |
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[17276] | 224 | |
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[18608] | 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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[17276] | 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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[18608] | 233 | const RsvgPSCtx *ctx) |
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[17276] | 234 | { |
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[18608] | 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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[18804] | 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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[18608] | 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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[18804] | 271 | art_affine_multiply (aff1, aff1, affine); |
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[18608] | 272 | art_affine_invert (agr->affine, aff1); |
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| 273 | |
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[18804] | 274 | /* todo: libart doesn't support spreads on radial gradients */ |
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[17276] | 275 | |
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[18608] | 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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[17276] | 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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[18608] | 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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[17276] | 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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[18608] | 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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[17276] | 344 | else |
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[18608] | 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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[17276] | 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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[18608] | 360 | const RsvgPSCtx *ctx) |
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[17276] | 361 | { |
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[18608] | 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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[17276] | 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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[18608] | 374 | if (ps == NULL) |
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| 375 | return; |
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| 376 | ps->refcnt++; |
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[17276] | 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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[18608] | 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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[17276] | 390 | } |
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[18608] | 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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[18804] | 402 | clone->obj_bbox = grad->obj_bbox; |
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[18608] | 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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[18804] | 417 | /* EVIL EVIL - SVG can base LinearGradients on |
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[18608] | 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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[18804] | 446 | clone->obj_bbox = grad->obj_bbox; |
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[18608] | 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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[18804] | 461 | /* EVIL EVIL - SVG can base LinearGradients on |
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[18608] | 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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