mirror of
https://code.videolan.org/videolan/vlc
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273 lines
8.9 KiB
C
273 lines
8.9 KiB
C
/*****************************************************************************
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* svg.c: svg decoder module making use of librsvg2.
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*****************************************************************************
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* Copyright (C) 2014 VLC authors and VideoLAN
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*
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* Authors: Adam Leggett <adamvleggett@gmail.com>
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* Jean-Paul Saman <jpsaman@videolan.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_codec.h>
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#include <glib.h>
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#include <glib/gstdio.h>
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#include <glib-object.h> /* g_object_unref( ) */
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#include <librsvg/rsvg.h>
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#include <cairo/cairo.h>
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int OpenDecoder ( vlc_object_t * );
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static void CloseDecoder ( vlc_object_t * );
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static int DecodeBlock ( decoder_t *, block_t * );
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#define TEXT_WIDTH N_("Image width")
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#define LONG_TEXT_WIDTH N_("Specify the width to decode the image too")
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#define TEXT_HEIGHT N_("Image height")
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#define LONG_TEXT_HEIGHT N_("Specify the height to decode the image too")
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#define TEXT_SCALE N_("Scale factor")
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#define LONG_TEXT_SCALE N_("Scale factor to apply to image")
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin ()
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set_category( CAT_INPUT )
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set_subcategory( SUBCAT_INPUT_VCODEC )
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set_description( N_("SVG video decoder") )
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set_capability( "video decoder", 100 )
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set_callbacks( OpenDecoder, CloseDecoder )
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add_shortcut( "svg" )
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/* svg options */
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add_integer_with_range( "svg-width", -1, 1, 65535,
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TEXT_WIDTH, LONG_TEXT_WIDTH, false )
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change_safe()
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add_integer_with_range( "svg-height", -1, 1, 65535,
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TEXT_HEIGHT, LONG_TEXT_HEIGHT, false )
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change_safe()
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add_float( "svg-scale", -1.0, TEXT_SCALE, LONG_TEXT_SCALE, false )
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vlc_module_end ()
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typedef struct
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{
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int32_t i_width;
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int32_t i_height;
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double f_scale;
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} decoder_sys_t;
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/*****************************************************************************
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* OpenDecoder: probe the decoder and return score
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*****************************************************************************/
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static int OpenDecoder( vlc_object_t *p_this )
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{
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decoder_t *p_dec = (decoder_t*)p_this;
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if( p_dec->fmt_in.i_codec != VLC_CODEC_SVG )
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return VLC_EGENERIC;
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decoder_sys_t *p_sys = malloc( sizeof(decoder_sys_t) );
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if (!p_sys)
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return VLC_ENOMEM;
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p_dec->p_sys = p_sys;
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p_sys->i_width = var_InheritInteger( p_this, "svg-width" );
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p_sys->i_height = var_InheritInteger( p_this, "svg-height" );
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p_sys->f_scale = var_InheritFloat( p_this, "svg-scale" );
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/* Initialize library */
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#if (GLIB_MAJOR_VERSION < 2 || GLIB_MINOR_VERSION < 36)
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g_type_init();
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#endif
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/* Set output properties */
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p_dec->fmt_out.i_codec = VLC_CODEC_BGRA;
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/* Set callbacks */
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p_dec->pf_decode = DecodeBlock;
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return VLC_SUCCESS;
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}
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/****************************************************************************
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* DecodeBlock: the whole thing
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****************************************************************************
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* This function must be fed with a complete image.
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****************************************************************************/
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static int DecodeBlock( decoder_t *p_dec, block_t *p_block )
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{
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decoder_sys_t *p_sys = (decoder_sys_t *) p_dec->p_sys;
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picture_t *p_pic = NULL;
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int32_t i_width, i_height;
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RsvgHandle *rsvg = NULL;
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cairo_surface_t *surface = NULL;
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cairo_t *cr = NULL;
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if( p_block == NULL ) /* No Drain */
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return VLCDEC_SUCCESS;
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if( p_block->i_flags & BLOCK_FLAG_CORRUPTED)
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{
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block_Release( p_block );
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return VLCDEC_SUCCESS;
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}
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rsvg = rsvg_handle_new_from_data( p_block->p_buffer, p_block->i_buffer, NULL );
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if( !rsvg )
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goto done;
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RsvgDimensionData dim;
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rsvg_handle_get_dimensions( rsvg, &dim );
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if( p_sys->f_scale > 0.0 )
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{
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i_width = (int32_t)(p_sys->f_scale * dim.width);
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i_height = (int32_t)(p_sys->f_scale * dim.height);
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}
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else
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{
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/* Keep aspect */
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if( p_sys->i_width < 0 && p_sys->i_height > 0 )
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{
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i_width = dim.width * p_sys->i_height / dim.height;
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i_height = p_sys->i_height;
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}
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else if( p_sys->i_width > 0 && p_sys->i_height < 0 )
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{
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i_width = p_sys->i_width;
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i_height = dim.height * p_sys->i_width / dim.height;
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}
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else if( p_sys->i_width > 0 && p_sys->i_height > 0 )
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{
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i_width = dim.width * p_sys->i_height / dim.height;
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i_height = p_sys->i_height;
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}
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else
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{
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i_width = dim.width;
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i_height = dim.height;
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}
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}
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p_dec->fmt_out.i_codec =
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p_dec->fmt_out.video.i_chroma = VLC_CODEC_BGRA;
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p_dec->fmt_out.video.i_width = i_width;
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p_dec->fmt_out.video.i_height = i_height;
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p_dec->fmt_out.video.i_visible_width = i_width;
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p_dec->fmt_out.video.i_visible_height = i_height;
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p_dec->fmt_out.video.i_sar_num = 1;
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p_dec->fmt_out.video.i_sar_den = 1;
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p_dec->fmt_out.video.i_rmask = 0x80800000; /* Since librsvg v1.0 */
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p_dec->fmt_out.video.i_gmask = 0x0000ff00;
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p_dec->fmt_out.video.i_bmask = 0x000000ff;
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video_format_FixRgb(&p_dec->fmt_out.video);
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/* Get a new picture */
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if( decoder_UpdateVideoFormat( p_dec ) )
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goto done;
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p_pic = decoder_NewPicture( p_dec );
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if( !p_pic )
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goto done;
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/* NOTE: Do not use the stride calculation from cairo, because it is wrong:
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* stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, dim.width);
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* Use the stride from VLC its picture_t::p[0].i_pitch, which is correct.
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*/
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memset(p_pic->p[0].p_pixels, 0, p_pic->p[0].i_pitch * p_pic->p[0].i_lines);
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surface = cairo_image_surface_create_for_data( p_pic->p->p_pixels,
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CAIRO_FORMAT_ARGB32,
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i_width, i_height,
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p_pic->p[0].i_pitch );
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if( !surface )
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{
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picture_Release( p_pic );
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p_pic = NULL;
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goto done;
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}
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/* Decode picture */
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cr = cairo_create( surface );
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if( !cr )
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{
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picture_Release( p_pic );
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p_pic = NULL;
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goto done;
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}
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if ( i_width != dim.width || i_height != dim.height )
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{
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double sw, sh;
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if ( p_sys->f_scale > 0.0 && !(p_sys->i_width > 0 || p_sys->i_height > 0) )
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sw = sh = p_sys->f_scale;
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else
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{
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double aspect = (double) (dim.width * p_dec->fmt_out.video.i_sar_num) /
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(dim.height * p_dec->fmt_out.video.i_sar_den);
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sw = aspect * i_width / dim.width;
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sh = aspect * i_height / dim.height;
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}
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cairo_scale(cr, sw, sh);
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}
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if( !rsvg_handle_render_cairo( rsvg, cr ) )
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{
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picture_Release( p_pic );
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p_pic = NULL;
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goto done;
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}
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p_pic->date = p_block->i_pts != VLC_TICK_INVALID ? p_block->i_pts : p_block->i_dts;
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done:
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if( rsvg )
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g_object_unref( G_OBJECT( rsvg ) );
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if( cr )
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cairo_destroy( cr );
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if( surface )
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cairo_surface_destroy( surface );
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block_Release( p_block );
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if( p_pic != NULL )
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decoder_QueueVideo( p_dec, p_pic );
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return VLCDEC_SUCCESS;
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}
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/*****************************************************************************
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* CloseDecoder: png decoder destruction
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*****************************************************************************/
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static void CloseDecoder( vlc_object_t *p_this )
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{
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VLC_UNUSED( p_this );
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#if (GLIB_MAJOR_VERSION < 2 || GLIB_MINOR_VERSION < 36)
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rsvg_term();
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#endif
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}
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