libass/ass_render_api.c

   1 /*
   2  * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
   3  * Copyright (C) 2010 Grigori Goronzy <greg@geekmind.org>
   4  *
   5  * This file is part of libass.
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #include "config.h"
  21 #include "ass_render.h"
  22
  23 static void ass_reconfigure(ASS_Renderer *priv)
  24 {
  25     ASS_Settings *settings = &priv->settings;
  26
  27     priv->render_id++;
  28     ass_cache_empty(priv->cache.outline_cache, 0);
  29     ass_cache_empty(priv->cache.bitmap_cache, 0);
  30     ass_cache_empty(priv->cache.composite_cache, 0);
  31     ass_free_images(priv->prev_images_root);
  32     priv->prev_images_root = 0;
  33
  34     priv->width = settings->frame_width;
  35     priv->height = settings->frame_height;
  36     priv->orig_width = settings->frame_width - settings->left_margin -
  37         settings->right_margin;
  38     priv->orig_height = settings->frame_height - settings->top_margin -
  39         settings->bottom_margin;
  40     priv->orig_width_nocrop =
  41         settings->frame_width - FFMAX(settings->left_margin, 0) -
  42         FFMAX(settings->right_margin, 0);
  43     priv->orig_height_nocrop =
  44         settings->frame_height - FFMAX(settings->top_margin, 0) -
  45         FFMAX(settings->bottom_margin, 0);
  46 }
  47
  48 void ass_set_frame_size(ASS_Renderer *priv, int w, int h)
  49 {
  50     if (priv->settings.frame_width != w || priv->settings.frame_height != h) {
  51         priv->settings.frame_width = w;
  52         priv->settings.frame_height = h;
  53         if (priv->settings.aspect == 0.) {
  54             priv->settings.aspect = ((double) w) / h;
  55             priv->settings.storage_aspect = ((double) w) / h;
  56         }
  57         ass_reconfigure(priv);
  58     }
  59 }
  60
  61 void ass_set_shaper(ASS_Renderer *priv, ASS_ShapingLevel level)
  62 {
  63 #ifdef CONFIG_HARFBUZZ
  64     // select the complex shaper for illegal values
  65     if (level == ASS_SHAPING_SIMPLE || level == ASS_SHAPING_COMPLEX)
  66         priv->settings.shaper = level;
  67     else
  68         priv->settings.shaper = ASS_SHAPING_COMPLEX;
  69 #endif
  70 }
  71
  72 void ass_set_margins(ASS_Renderer *priv, int t, int b, int l, int r)
  73 {
  74     if (priv->settings.left_margin != l || priv->settings.right_margin != r ||
  75         priv->settings.top_margin != t || priv->settings.bottom_margin != b) {
  76         priv->settings.left_margin = l;
  77         priv->settings.right_margin = r;
  78         priv->settings.top_margin = t;
  79         priv->settings.bottom_margin = b;
  80         ass_reconfigure(priv);
  81     }
  82 }
  83
  84 void ass_set_use_margins(ASS_Renderer *priv, int use)
  85 {
  86     priv->settings.use_margins = use;
  87 }
  88
  89 void ass_set_aspect_ratio(ASS_Renderer *priv, double dar, double sar)
  90 {
  91     if (priv->settings.aspect != dar || priv->settings.storage_aspect != sar) {
  92         priv->settings.aspect = dar;
  93         priv->settings.storage_aspect = sar;
  94         ass_reconfigure(priv);
  95     }
  96 }
  97
  98 void ass_set_font_scale(ASS_Renderer *priv, double font_scale)
  99 {
 100     if (priv->settings.font_size_coeff != font_scale) {
 101         priv->settings.font_size_coeff = font_scale;
 102         ass_reconfigure(priv);
 103     }
 104 }
 105
 106 void ass_set_hinting(ASS_Renderer *priv, ASS_Hinting ht)
 107 {
 108     if (priv->settings.hinting != ht) {
 109         priv->settings.hinting = ht;
 110         ass_reconfigure(priv);
 111     }
 112 }
 113
 114 void ass_set_line_spacing(ASS_Renderer *priv, double line_spacing)
 115 {
 116     priv->settings.line_spacing = line_spacing;
 117 }
 118
 119 void ass_set_fonts(ASS_Renderer *priv, const char *default_font,
 120                    const char *default_family, int fc, const char *config,
 121                    int update)
 122 {
 123     free(priv->settings.default_font);
 124     free(priv->settings.default_family);
 125     priv->settings.default_font = default_font ? strdup(default_font) : 0;
 126     priv->settings.default_family =
 127         default_family ? strdup(default_family) : 0;
 128
 129     if (priv->fontconfig_priv)
 130         fontconfig_done(priv->fontconfig_priv);
 131     priv->fontconfig_priv =
 132         fontconfig_init(priv->library, priv->ftlibrary, default_family,
 133                         default_font, fc, config, update);
 134 }
 135
 136 int ass_fonts_update(ASS_Renderer *render_priv)
 137 {
 138     return fontconfig_update(render_priv->fontconfig_priv);
 139 }
 140
 141 void ass_set_cache_limits(ASS_Renderer *render_priv, int glyph_max,
 142                           int bitmap_max)
 143 {
 144     render_priv->cache.glyph_max = glyph_max ? glyph_max : GLYPH_CACHE_MAX;
 145     render_priv->cache.bitmap_max_size = bitmap_max ? 1048576 * bitmap_max :
 146                                          BITMAP_CACHE_MAX_SIZE;
 147 }