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#include "ghostxps.h"
int
xps_begin_opacity(xps_context_t *ctx, xps_resource_t *dict, char *opacity_att, xps_item_t *opacity_mask_tag)
{
gs_transparency_group_params_t tgp;
gs_transparency_mask_params_t tmp;
gs_rect bbox;
float opacity;
int save;
if (!opacity_att && !opacity_mask_tag)
return 0;
opacity = 1.0;
if (opacity_att)
opacity = atof(opacity_att);
gs_setopacityalpha(ctx->pgs, opacity);
xps_bounds_in_user_space(ctx, &bbox);
if (opacity_mask_tag)
{
//dprintf1("begin opacity mask (%s)\n", xps_tag(opacity_mask_tag));
gs_trans_mask_params_init(&tmp, TRANSPARENCY_MASK_Luminosity);
gs_begin_transparency_mask(ctx->pgs, &tmp, &bbox, 0);
/* Need a path to fill/clip for the brush */
gs_moveto(ctx->pgs, bbox.p.x, bbox.p.y);
gs_lineto(ctx->pgs, bbox.p.x, bbox.q.y);
gs_lineto(ctx->pgs, bbox.q.x, bbox.q.y);
gs_lineto(ctx->pgs, bbox.q.x, bbox.p.y);
gs_closepath(ctx->pgs);
// gs_setopacityalpha(ctx->pgs, 0.5);
// gs_setrgbcolor(ctx->pgs, 1, 1, 1);
// gs_fill(ctx->pgs);
/* opacity-only mode: use alpha value as gray color to create luminosity mask */
save = ctx->opacity_only;
ctx->opacity_only = 1;
gs_gsave(ctx->pgs);
xps_parse_brush(ctx, dict, opacity_mask_tag);
gs_grestore(ctx->pgs);
ctx->opacity_only = save;
gs_end_transparency_mask(ctx->pgs, TRANSPARENCY_CHANNEL_Opacity);
}
gs_trans_group_params_init(&tgp);
gs_begin_transparency_group(ctx->pgs, &tgp, &bbox);
return 0;
}
int
xps_end_opacity(xps_context_t *ctx, xps_resource_t *dict, char *opacity_att, xps_item_t *opacity_mask_tag)
{
if (!opacity_att && !opacity_mask_tag)
return 0;
gs_end_transparency_group(ctx->pgs);
return 0;
}
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