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/*
* Copyright (C) 2018 Vito Caputo - <vcaputo@pengaru.com>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3 as published
* by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h> /* this is needed by cairo headers of all things */
#include <cairo.h>
#ifdef HAVE_SVG_CAIRO
#include <svg-cairo.h>
#else
#include <librsvg/rsvg.h>
#endif
#include "macros.h"
typedef struct whale_svg_t {
#ifdef HAVE_SVG_CAIRO
svg_cairo_t *cairo_svg;
unsigned width, height;
#else
RsvgHandle *rsvg;
RsvgDimensionData dimensions;
#endif
} whale_svg_t;
whale_svg_t * whale_svg_new_file(const char *file)
{
whale_svg_t *svg;
svg = calloc(1, sizeof(whale_svg_t));
fatal_if(!svg, "Unable to create svg");
#ifdef HAVE_SVG_CAIRO
fatal_if(svg_cairo_create(&svg->cairo_svg) != 0,
"Unable to create svg-cairo context");
fatal_if(svg_cairo_parse(svg->cairo_svg, file) != 0,
"Unable to parse \"%s\"", file);
svg_cairo_get_size(svg->cairo_svg, &svg->width, &svg->height);
#else
//rsvg_init();
svg->rsvg = rsvg_handle_new_from_file(file, NULL);
fatal_if(!svg->rsvg,
"Unable to create rsvg handle from file \"%s\"", file);
rsvg_handle_get_dimensions(svg->rsvg, &svg->dimensions);
#endif
return svg;
}
whale_svg_t * whale_svg_new_buffer(const char *buf, size_t count)
{
whale_svg_t *svg;
svg = calloc(1, sizeof(whale_svg_t));
fatal_if(!svg, "Unable to create svg");
#ifdef HAVE_SVG_CAIRO
fatal_if(svg_cairo_create(&svg->cairo_svg) != 0,
"Unable to create svg-cairo context");
fatal_if(svg_cairo_parse_buffer(svg->cairo_svg, buf, count) != 0,
"Unable to parse svg buffer");
svg_cairo_get_size(svg->cairo_svg, &svg->width, &svg->height);
#else
//rsvg_init();
svg->rsvg = rsvg_handle_new_from_data(buf, count, NULL);
fatal_if(!svg->rsvg,
"Unable to create rsvg handle from buffer");
rsvg_handle_get_dimensions(svg->rsvg, &svg->dimensions);
#endif
return svg;
}
SDL_Surface * whale_svg_render(whale_svg_t *svg, int width, int height)
{
cairo_surface_t *cairo_surface;
SDL_Surface *sdl_surface;
cairo_t *cairo;
double xscale, yscale, scale, tx, ty, svg_width, svg_height;
#ifdef HAVE_SVG_CAIRO
svg_width = svg->width;
svg_height = svg->height;
#else
svg_width = svg->dimensions.width;
svg_height = svg->dimensions.height;
#endif
/* cached size is different so redo the costly SVG render */
sdl_surface = SDL_CreateRGBSurfaceWithFormat(0, width, height, 32, SDL_PIXELFORMAT_ARGB8888);
fatal_if(!sdl_surface, "Unable to create sdl surface");
cairo_surface = cairo_image_surface_create_for_data(sdl_surface->pixels,
CAIRO_FORMAT_ARGB32,
width,
height,
sdl_surface->pitch);
fatal_if(!cairo_surface, "Unable to create cairo surface");
#if 0
/* useful for debugging */
SDL_FillRect(sdl_surface, NULL, 0xffff0000);
#endif
cairo = cairo_create(cairo_surface);
fatal_if(!cairo, "Unable to create cairo target");
/* XXX: this scaling attempts to preserve the svg's aspect ratio,
* while filling the destination surface
*/
xscale = (double)width / svg_width;
yscale = (double)height / svg_height;
scale = xscale < yscale ? xscale : yscale;
/* if we have a mismatch between the desired width/height aspect ratio,
* and the svg's aspect ratio, we need to translate to center the rendering
* in the resulting surface
*/
tx = scale * svg_width;
ty = scale * svg_height;
if ((int)((double)tx + 0.5) < width)
tx = ((double)width - tx + 0.5) / 2.0;
else
tx = 0;
if ((int)((double)ty + 0.5) < height)
ty = ((double)height - ty + 0.5) / 2.0;
else
ty = 0;
cairo_translate(cairo, tx, ty);
cairo_scale(cairo, scale, scale);
#ifdef HAVE_SVG_CAIRO
svg_cairo_render(svg->cairo_svg, cairo);
#else
rsvg_handle_render_cairo(svg->rsvg, cairo);
#endif
cairo_surface_flush(cairo_surface);
cairo_surface_destroy(cairo_surface);
cairo_destroy(cairo);
return sdl_surface;
}
void whale_svg_free(whale_svg_t *svg)
{
#ifdef HAVE_SVG_CAIRO
svg_cairo_destroy(svg->cairo_svg);
#else
rsvg_handle_free(svg->rsvg);
#endif
free(svg);
}
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