[18608] | 1 | /* vim: set sw=4: -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */ |
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| 2 | /* |
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| 3 | rsvg-file-util.c: SAX-based renderer for SVG files into a GdkPixbuf. |
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| 4 | |
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| 5 | Copyright (C) 2000 Eazel, Inc. |
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| 6 | Copyright (C) 2002 Dom Lachowicz <cinamod@hotmail.com> |
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| 7 | |
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| 8 | This program is free software; you can redistribute it and/or |
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| 9 | modify it under the terms of the GNU Library General Public License as |
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| 10 | published by the Free Software Foundation; either version 2 of the |
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| 11 | License, or (at your option) any later version. |
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| 12 | |
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| 13 | This program is distributed in the hope that it will be useful, |
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | Library General Public License for more details. |
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| 17 | |
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| 18 | You should have received a copy of the GNU Library General Public |
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| 19 | License along with this program; if not, write to the |
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| 20 | Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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| 21 | Boston, MA 02111-1307, USA. |
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| 22 | |
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| 23 | Author: Raph Levien <raph@artofcode.com> |
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| 24 | */ |
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| 25 | |
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| 26 | #include "config.h" |
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| 27 | #include "rsvg.h" |
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| 28 | |
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[18804] | 29 | #if HAVE_SVGZ |
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| 30 | #include "rsvg-gz.h" |
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| 31 | #endif |
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| 32 | |
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[18608] | 33 | #include <stdio.h> |
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| 34 | #include <stdlib.h> |
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| 35 | #include <math.h> |
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| 36 | |
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| 37 | #define SVG_BUFFER_SIZE (1024 * 8) |
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| 38 | |
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| 39 | typedef enum { |
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| 40 | RSVG_SIZE_ZOOM, |
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| 41 | RSVG_SIZE_WH, |
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| 42 | RSVG_SIZE_WH_MAX, |
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| 43 | RSVG_SIZE_ZOOM_MAX |
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| 44 | } RsvgSizeType; |
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| 45 | |
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| 46 | struct RsvgSizeCallbackData |
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| 47 | { |
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| 48 | RsvgSizeType type; |
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| 49 | double x_zoom; |
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| 50 | double y_zoom; |
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| 51 | gint width; |
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| 52 | gint height; |
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| 53 | }; |
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| 54 | |
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| 55 | static void |
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| 56 | rsvg_size_callback (int *width, |
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| 57 | int *height, |
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| 58 | gpointer data) |
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| 59 | { |
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| 60 | struct RsvgSizeCallbackData *real_data = (struct RsvgSizeCallbackData *) data; |
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| 61 | double zoomx, zoomy, zoom; |
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| 62 | |
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| 63 | switch (real_data->type) { |
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| 64 | case RSVG_SIZE_ZOOM: |
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| 65 | if (*width < 0 || *height < 0) |
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| 66 | return; |
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| 67 | |
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| 68 | *width = floor (real_data->x_zoom * *width + 0.5); |
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| 69 | *height = floor (real_data->y_zoom * *height + 0.5); |
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| 70 | return; |
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| 71 | |
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| 72 | case RSVG_SIZE_ZOOM_MAX: |
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| 73 | if (*width < 0 || *height < 0) |
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| 74 | return; |
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| 75 | |
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| 76 | *width = floor (real_data->x_zoom * *width + 0.5); |
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| 77 | *height = floor (real_data->y_zoom * *height + 0.5); |
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| 78 | |
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| 79 | if (*width > real_data->width || *height > real_data->height) |
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| 80 | { |
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| 81 | zoomx = (double) real_data->width / *width; |
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| 82 | zoomy = (double) real_data->height / *height; |
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| 83 | zoom = MIN (zoomx, zoomy); |
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| 84 | |
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| 85 | *width = floor (zoom * *width + 0.5); |
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| 86 | *height = floor (zoom * *height + 0.5); |
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| 87 | } |
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| 88 | return; |
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| 89 | |
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| 90 | case RSVG_SIZE_WH_MAX: |
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| 91 | if (*width < 0 || *height < 0) |
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| 92 | return; |
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| 93 | |
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| 94 | zoomx = (double) real_data->width / *width; |
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| 95 | zoomy = (double) real_data->height / *height; |
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| 96 | zoom = MIN (zoomx, zoomy); |
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| 97 | |
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| 98 | *width = floor (zoom * *width + 0.5); |
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| 99 | *height = floor (zoom * *height + 0.5); |
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| 100 | return; |
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| 101 | |
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| 102 | case RSVG_SIZE_WH: |
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| 103 | |
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| 104 | if (real_data->width != -1) |
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| 105 | *width = real_data->width; |
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| 106 | if (real_data->height != -1) |
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| 107 | *height = real_data->height; |
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| 108 | return; |
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| 109 | } |
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| 110 | |
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| 111 | g_assert_not_reached (); |
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| 112 | } |
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| 113 | |
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| 114 | static GdkPixbuf * |
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[18804] | 115 | rsvg_pixbuf_from_file_with_size_data_ex (RsvgHandle * handle, |
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| 116 | const gchar * file_name, |
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| 117 | struct RsvgSizeCallbackData * data, |
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| 118 | GError ** error) |
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[18608] | 119 | { |
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[18804] | 120 | guchar chars[SVG_BUFFER_SIZE]; |
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| 121 | GdkPixbuf *retval; |
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[18608] | 122 | gint result; |
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[18804] | 123 | FILE *f = fopen (file_name, "rb"); |
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| 124 | |
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| 125 | if (!f) |
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[18608] | 126 | { |
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| 127 | /* FIXME: Set up error. */ |
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| 128 | return NULL; |
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| 129 | } |
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[18804] | 130 | |
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| 131 | rsvg_handle_set_size_callback (handle, rsvg_size_callback, data, NULL); |
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| 132 | |
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| 133 | while ((result = fread (chars, 1, SVG_BUFFER_SIZE, f)) > 0) |
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| 134 | rsvg_handle_write (handle, chars, result, error); |
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| 135 | |
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| 136 | rsvg_handle_close (handle, error); |
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| 137 | retval = rsvg_handle_get_pixbuf (handle); |
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| 138 | |
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| 139 | fclose (f); |
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| 140 | return retval; |
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| 141 | } |
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| 142 | |
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| 143 | static GdkPixbuf * |
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| 144 | rsvg_pixbuf_from_file_with_size_data (const gchar * file_name, |
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| 145 | struct RsvgSizeCallbackData * data, |
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| 146 | GError ** error) |
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| 147 | { |
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| 148 | #if HAVE_SVGZ |
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| 149 | RsvgHandle * handle; |
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| 150 | guchar chars[SVG_BUFFER_SIZE]; |
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| 151 | GdkPixbuf *retval; |
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| 152 | gint result; |
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| 153 | FILE *f = fopen (file_name, "rb"); |
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| 154 | |
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[18608] | 155 | if (!f) |
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| 156 | { |
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| 157 | /* FIXME: Set up error. */ |
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| 158 | return NULL; |
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| 159 | } |
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| 160 | |
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[18804] | 161 | result = fread (chars, 1, SVG_BUFFER_SIZE, f); |
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| 162 | |
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| 163 | if (result == 0) { |
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| 164 | fclose (f); |
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| 165 | return NULL; |
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| 166 | } |
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| 167 | |
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| 168 | /* test for GZ marker */ |
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| 169 | if ((result >= 2) && (chars[0] == (guchar)0x1f) && (chars[1] == (guchar)0x8b)) |
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| 170 | handle = rsvg_handle_new_gz (); |
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| 171 | else |
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| 172 | handle = rsvg_handle_new (); |
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| 173 | |
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[18608] | 174 | rsvg_handle_set_size_callback (handle, rsvg_size_callback, data, NULL); |
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[18804] | 175 | rsvg_handle_write (handle, chars, result, error); |
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[18608] | 176 | |
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| 177 | while ((result = fread (chars, 1, SVG_BUFFER_SIZE, f)) > 0) |
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| 178 | rsvg_handle_write (handle, chars, result, error); |
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| 179 | |
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| 180 | rsvg_handle_close (handle, error); |
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| 181 | retval = rsvg_handle_get_pixbuf (handle); |
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| 182 | |
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[18804] | 183 | fclose (f); |
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| 184 | rsvg_handle_free (handle); |
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| 185 | return retval; |
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[18608] | 186 | #else |
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[18804] | 187 | RsvgHandle * handle = rsvg_handle_new (); |
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| 188 | GdkPixbuf * retval = rsvg_pixbuf_from_file_with_size_data_ex (handle, file_name, data, error); |
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| 189 | rsvg_handle_free (handle); |
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| 190 | return retval; |
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[18608] | 191 | #endif |
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[18804] | 192 | } |
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| 193 | |
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| 194 | |
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| 195 | /** |
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| 196 | * rsvg_pixbuf_from_file_at_size_ex: |
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| 197 | * @handle: The RSVG handle you wish to render with (either normal or gzipped) |
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| 198 | * @file_name: A file name |
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| 199 | * @width: The new width, or -1 |
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| 200 | * @height: The new height, or -1 |
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| 201 | * @error: return location for errors |
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| 202 | * |
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| 203 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is scaled |
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| 204 | * from the size indicated to the new size indicated by @width and @height. If |
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| 205 | * either of these are -1, then the default size of the image being loaded is |
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| 206 | * used. The caller must assume the reference to the returned pixbuf. If an |
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| 207 | * error occurred, @error is set and %NULL is returned. Returned handle is closed |
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| 208 | * by this call and must be freed by the caller. |
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| 209 | * |
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| 210 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
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| 211 | **/ |
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| 212 | GdkPixbuf * |
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| 213 | rsvg_pixbuf_from_file_at_size_ex (RsvgHandle * handle, |
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| 214 | const gchar *file_name, |
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| 215 | gint width, |
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| 216 | gint height, |
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| 217 | GError **error) |
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| 218 | { |
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| 219 | struct RsvgSizeCallbackData data; |
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[18608] | 220 | |
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[18804] | 221 | data.type = RSVG_SIZE_WH; |
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| 222 | data.width = width; |
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| 223 | data.height = height; |
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[18608] | 224 | |
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[18804] | 225 | return rsvg_pixbuf_from_file_with_size_data_ex (handle, file_name, &data, error); |
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[18608] | 226 | } |
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| 227 | |
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| 228 | /** |
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[18804] | 229 | * rsvg_pixbuf_from_file_ex: |
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| 230 | * @handle: The RSVG handle you wish to render with (either normal or gzipped) |
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| 231 | * @file_name: A file name |
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| 232 | * @error: return location for errors |
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| 233 | * |
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| 234 | * Loads a new #GdkPixbuf from @file_name and returns it. The caller must |
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| 235 | * assume the reference to the reurned pixbuf. If an error occurred, @error is |
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| 236 | * set and %NULL is returned. Returned handle is closed by this call and must be |
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| 237 | * freed by the caller. |
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| 238 | * |
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| 239 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
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| 240 | **/ |
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| 241 | GdkPixbuf * |
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| 242 | rsvg_pixbuf_from_file_ex (RsvgHandle * handle, |
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| 243 | const gchar *file_name, |
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| 244 | GError **error) |
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| 245 | { |
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| 246 | return rsvg_pixbuf_from_file_at_size_ex (handle, file_name, -1, -1, error); |
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| 247 | } |
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| 248 | |
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| 249 | /** |
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| 250 | * rsvg_pixbuf_from_file_at_zoom_ex: |
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| 251 | * @handle: The RSVG handle you wish to render with (either normal or gzipped) |
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| 252 | * @file_name: A file name |
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| 253 | * @x_zoom: The horizontal zoom factor |
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| 254 | * @y_zoom: The vertical zoom factor |
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| 255 | * @error: return location for errors |
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| 256 | * |
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| 257 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is scaled |
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| 258 | * from the size indicated by the file by a factor of @x_zoom and @y_zoom. The |
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| 259 | * caller must assume the reference to the returned pixbuf. If an error |
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| 260 | * occurred, @error is set and %NULL is returned. Returned handle is closed by this |
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| 261 | * call and must be freed by the caller. |
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| 262 | * |
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| 263 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
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| 264 | **/ |
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| 265 | GdkPixbuf * |
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| 266 | rsvg_pixbuf_from_file_at_zoom_ex (RsvgHandle * handle, |
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| 267 | const gchar *file_name, |
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| 268 | double x_zoom, |
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| 269 | double y_zoom, |
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| 270 | GError **error) |
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| 271 | { |
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| 272 | struct RsvgSizeCallbackData data; |
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| 273 | |
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| 274 | g_return_val_if_fail (file_name != NULL, NULL); |
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| 275 | g_return_val_if_fail (x_zoom > 0.0 && y_zoom > 0.0, NULL); |
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| 276 | |
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| 277 | data.type = RSVG_SIZE_ZOOM; |
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| 278 | data.x_zoom = x_zoom; |
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| 279 | data.y_zoom = y_zoom; |
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| 280 | |
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| 281 | return rsvg_pixbuf_from_file_with_size_data_ex (handle, file_name, &data, error); |
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| 282 | } |
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| 283 | |
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| 284 | /** |
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| 285 | * rsvg_pixbuf_from_file_at_max_size_ex: |
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| 286 | * @handle: The RSVG handle you wish to render with (either normal or gzipped) |
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| 287 | * @file_name: A file name |
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| 288 | * @max_width: The requested max width |
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| 289 | * @max_height: The requested max heigh |
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| 290 | * @error: return location for errors |
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| 291 | * |
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| 292 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is uniformly |
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| 293 | * scaled so that the it fits into a rectangle of size max_width * max_height. The |
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| 294 | * caller must assume the reference to the returned pixbuf. If an error occurred, |
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| 295 | * @error is set and %NULL is returned. Returned handle is closed by this call and |
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| 296 | * must be freed by the caller. |
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| 297 | * |
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| 298 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
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| 299 | **/ |
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| 300 | GdkPixbuf * |
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| 301 | rsvg_pixbuf_from_file_at_max_size_ex (RsvgHandle * handle, |
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| 302 | const gchar *file_name, |
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| 303 | gint max_width, |
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| 304 | gint max_height, |
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| 305 | GError **error) |
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| 306 | { |
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| 307 | struct RsvgSizeCallbackData data; |
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| 308 | |
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| 309 | data.type = RSVG_SIZE_WH_MAX; |
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| 310 | data.width = max_width; |
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| 311 | data.height = max_height; |
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| 312 | |
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| 313 | return rsvg_pixbuf_from_file_with_size_data_ex (handle, file_name, &data, error); |
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| 314 | } |
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| 315 | |
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| 316 | /** |
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| 317 | * rsvg_pixbuf_from_file_at_zoom_with_max_ex: |
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| 318 | * @handle: The RSVG handle you wish to render with (either normal or gzipped) |
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| 319 | * @file_name: A file name |
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| 320 | * @x_zoom: The horizontal zoom factor |
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| 321 | * @y_zoom: The vertical zoom factor |
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| 322 | * @max_width: The requested max width |
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| 323 | * @max_height: The requested max heigh |
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| 324 | * @error: return location for errors |
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| 325 | * |
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| 326 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is scaled |
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| 327 | * from the size indicated by the file by a factor of @x_zoom and @y_zoom. If the |
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| 328 | * resulting pixbuf would be larger than max_width/max_heigh it is uniformly scaled |
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| 329 | * down to fit in that rectangle. The caller must assume the reference to the |
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| 330 | * returned pixbuf. If an error occurred, @error is set and %NULL is returned. |
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| 331 | * Returned handle is closed by this call and must be freed by the caller. |
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| 332 | * |
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| 333 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
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| 334 | **/ |
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| 335 | GdkPixbuf * |
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| 336 | rsvg_pixbuf_from_file_at_zoom_with_max_ex (RsvgHandle * handle, |
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| 337 | const gchar *file_name, |
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| 338 | double x_zoom, |
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| 339 | double y_zoom, |
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| 340 | gint max_width, |
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| 341 | gint max_height, |
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| 342 | GError **error) |
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| 343 | { |
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| 344 | struct RsvgSizeCallbackData data; |
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| 345 | |
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| 346 | g_return_val_if_fail (file_name != NULL, NULL); |
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| 347 | g_return_val_if_fail (x_zoom > 0.0 && y_zoom > 0.0, NULL); |
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| 348 | |
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| 349 | data.type = RSVG_SIZE_ZOOM_MAX; |
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| 350 | data.x_zoom = x_zoom; |
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| 351 | data.y_zoom = y_zoom; |
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| 352 | data.width = max_width; |
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| 353 | data.height = max_height; |
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| 354 | |
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| 355 | return rsvg_pixbuf_from_file_with_size_data_ex (handle, file_name, &data, error); |
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| 356 | } |
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| 357 | |
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| 358 | /** |
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[18608] | 359 | * rsvg_pixbuf_from_file: |
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| 360 | * @file_name: A file name |
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| 361 | * @error: return location for errors |
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| 362 | * |
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| 363 | * Loads a new #GdkPixbuf from @file_name and returns it. The caller must |
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| 364 | * assume the reference to the reurned pixbuf. If an error occurred, @error is |
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| 365 | * set and %NULL is returned. |
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| 366 | * |
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| 367 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
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| 368 | **/ |
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| 369 | GdkPixbuf * |
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| 370 | rsvg_pixbuf_from_file (const gchar *file_name, |
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| 371 | GError **error) |
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| 372 | { |
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| 373 | return rsvg_pixbuf_from_file_at_size (file_name, -1, -1, error); |
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| 374 | } |
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| 375 | |
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| 376 | /** |
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| 377 | * rsvg_pixbuf_from_file_at_zoom: |
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| 378 | * @file_name: A file name |
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| 379 | * @x_zoom: The horizontal zoom factor |
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| 380 | * @y_zoom: The vertical zoom factor |
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| 381 | * @error: return location for errors |
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| 382 | * |
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| 383 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is scaled |
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| 384 | * from the size indicated by the file by a factor of @x_zoom and @y_zoom. The |
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| 385 | * caller must assume the reference to the returned pixbuf. If an error |
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| 386 | * occurred, @error is set and %NULL is returned. |
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| 387 | * |
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| 388 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
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| 389 | **/ |
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| 390 | GdkPixbuf * |
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| 391 | rsvg_pixbuf_from_file_at_zoom (const gchar *file_name, |
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| 392 | double x_zoom, |
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| 393 | double y_zoom, |
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| 394 | GError **error) |
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| 395 | { |
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| 396 | struct RsvgSizeCallbackData data; |
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| 397 | |
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| 398 | g_return_val_if_fail (file_name != NULL, NULL); |
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| 399 | g_return_val_if_fail (x_zoom > 0.0 && y_zoom > 0.0, NULL); |
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| 400 | |
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| 401 | data.type = RSVG_SIZE_ZOOM; |
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| 402 | data.x_zoom = x_zoom; |
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| 403 | data.y_zoom = y_zoom; |
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| 404 | |
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| 405 | return rsvg_pixbuf_from_file_with_size_data (file_name, &data, error); |
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| 406 | } |
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| 407 | |
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| 408 | /** |
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| 409 | * rsvg_pixbuf_from_file_at_zoom_with_max: |
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| 410 | * @file_name: A file name |
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| 411 | * @x_zoom: The horizontal zoom factor |
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| 412 | * @y_zoom: The vertical zoom factor |
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| 413 | * @max_width: The requested max width |
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| 414 | * @max_height: The requested max heigh |
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| 415 | * @error: return location for errors |
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| 416 | * |
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| 417 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is scaled |
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| 418 | * from the size indicated by the file by a factor of @x_zoom and @y_zoom. If the |
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| 419 | * resulting pixbuf would be larger than max_width/max_heigh it is uniformly scaled |
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| 420 | * down to fit in that rectangle. The caller must assume the reference to the |
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| 421 | * returned pixbuf. If an error occurred, @error is set and %NULL is returned. |
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| 422 | * |
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| 423 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
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| 424 | **/ |
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| 425 | GdkPixbuf * |
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| 426 | rsvg_pixbuf_from_file_at_zoom_with_max (const gchar *file_name, |
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| 427 | double x_zoom, |
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| 428 | double y_zoom, |
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| 429 | gint max_width, |
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| 430 | gint max_height, |
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| 431 | GError **error) |
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| 432 | { |
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| 433 | struct RsvgSizeCallbackData data; |
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| 434 | |
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| 435 | g_return_val_if_fail (file_name != NULL, NULL); |
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| 436 | g_return_val_if_fail (x_zoom > 0.0 && y_zoom > 0.0, NULL); |
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| 437 | |
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| 438 | data.type = RSVG_SIZE_ZOOM_MAX; |
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| 439 | data.x_zoom = x_zoom; |
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| 440 | data.y_zoom = y_zoom; |
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| 441 | data.width = max_width; |
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| 442 | data.height = max_height; |
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| 443 | |
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| 444 | return rsvg_pixbuf_from_file_with_size_data (file_name, &data, error); |
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| 445 | } |
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| 446 | |
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| 447 | /** |
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| 448 | * rsvg_pixbuf_from_file_at_size: |
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| 449 | * @file_name: A file name |
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| 450 | * @width: The new width, or -1 |
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| 451 | * @height: The new height, or -1 |
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| 452 | * @error: return location for errors |
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| 453 | * |
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| 454 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is scaled |
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| 455 | * from the size indicated to the new size indicated by @width and @height. If |
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| 456 | * either of these are -1, then the default size of the image being loaded is |
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| 457 | * used. The caller must assume the reference to the returned pixbuf. If an |
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| 458 | * error occurred, @error is set and %NULL is returned. |
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| 459 | * |
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| 460 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
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| 461 | **/ |
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| 462 | GdkPixbuf * |
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| 463 | rsvg_pixbuf_from_file_at_size (const gchar *file_name, |
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| 464 | gint width, |
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| 465 | gint height, |
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| 466 | GError **error) |
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| 467 | { |
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| 468 | struct RsvgSizeCallbackData data; |
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| 469 | |
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| 470 | data.type = RSVG_SIZE_WH; |
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| 471 | data.width = width; |
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| 472 | data.height = height; |
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| 473 | |
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| 474 | return rsvg_pixbuf_from_file_with_size_data (file_name, &data, error); |
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| 475 | } |
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| 476 | |
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| 477 | /** |
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| 478 | * rsvg_pixbuf_from_file_at_max_size: |
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| 479 | * @file_name: A file name |
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| 480 | * @max_width: The requested max width |
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| 481 | * @max_height: The requested max heigh |
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| 482 | * @error: return location for errors |
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| 483 | * |
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| 484 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is uniformly |
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| 485 | * scaled so that the it fits into a rectangle of size max_width * max_height. The |
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| 486 | * caller must assume the reference to the returned pixbuf. If an error occurred, |
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| 487 | * @error is set and %NULL is returned. |
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| 488 | * |
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| 489 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
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| 490 | **/ |
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| 491 | GdkPixbuf * |
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| 492 | rsvg_pixbuf_from_file_at_max_size (const gchar *file_name, |
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| 493 | gint max_width, |
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| 494 | gint max_height, |
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| 495 | GError **error) |
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| 496 | { |
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| 497 | struct RsvgSizeCallbackData data; |
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| 498 | |
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| 499 | data.type = RSVG_SIZE_WH_MAX; |
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| 500 | data.width = max_width; |
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| 501 | data.height = max_height; |
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| 502 | |
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| 503 | return rsvg_pixbuf_from_file_with_size_data (file_name, &data, error); |
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| 504 | } |
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