From 24c20239779d0ec616adde651c594c7bf08d58c7 Mon Sep 17 00:00:00 2001 From: Thomas White Date: Tue, 19 Feb 2019 18:17:56 +0100 Subject: WIP --- src-old/render.c | 332 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 332 insertions(+) create mode 100644 src-old/render.c (limited to 'src-old/render.c') diff --git a/src-old/render.c b/src-old/render.c new file mode 100644 index 0000000..6ac09fc --- /dev/null +++ b/src-old/render.c @@ -0,0 +1,332 @@ +/* + * render.c + * + * Copyright © 2013-2018 Thomas White + * + * This file is part of Colloquium. + * + * Colloquium is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * 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 . + * + */ + + +#ifdef HAVE_CONFIG_H +#include +#endif + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sc_parse.h" +#include "sc_interp.h" +#include "presentation.h" +#include "frame.h" +#include "render.h" +#include "imagestore.h" +#include "utils.h" + + +static void do_background(cairo_t *cr, struct frame *fr) +{ + cairo_pattern_t *patt = NULL; + + cairo_new_path(cr); + cairo_rectangle(cr, 0.0, 0.0, fr->w, fr->h); + + switch ( fr->grad ) { + + case GRAD_NONE: + cairo_set_source_rgba(cr, fr->bgcol[0], + fr->bgcol[1], + fr->bgcol[2], + fr->bgcol[3]); + break; + + case GRAD_VERT: + patt = cairo_pattern_create_linear(0.0, 0.0, + 0.0, fr->h); + cairo_pattern_add_color_stop_rgba(patt, 0.0, fr->bgcol[0], + fr->bgcol[1], + fr->bgcol[2], + fr->bgcol[3]); + cairo_pattern_add_color_stop_rgba(patt, 1.0, fr->bgcol2[0], + fr->bgcol2[1], + fr->bgcol2[2], + fr->bgcol2[3]); + cairo_set_source(cr, patt); + break; + + case GRAD_HORIZ: + patt = cairo_pattern_create_linear(0.0, 0.0, + fr->w, 0.0); + cairo_pattern_add_color_stop_rgba(patt, 0.0, fr->bgcol[0], + fr->bgcol[1], + fr->bgcol[2], + fr->bgcol[3]); + cairo_pattern_add_color_stop_rgba(patt, 1.0, fr->bgcol2[0], + fr->bgcol2[1], + fr->bgcol2[2], + fr->bgcol2[3]); + cairo_set_source(cr, patt); + break; + + } + + cairo_fill(cr); + if ( patt != NULL ) cairo_pattern_destroy(patt); +} + + +static int draw_frame(cairo_t *cr, struct frame *fr, ImageStore *is, + double min_y, double max_y) +{ + int i; + double hpos = 0.0; + + cairo_save(cr); + do_background(cr, fr); + + /* Actually render the contents */ + cairo_translate(cr, fr->pad_l, fr->pad_t); + for ( i=0; in_paras; i++ ) { + + double cur_h = paragraph_height(fr->paras[i]); + + cairo_save(cr); + cairo_translate(cr, 0.0, hpos); + + if ( (hpos + cur_h > min_y) && (hpos < max_y) ) { + render_paragraph(cr, fr->paras[i], is); + } /* else paragraph is not visible */ + + hpos += cur_h; + cairo_restore(cr); + + } + cairo_restore(cr); + + return 0; +} + + +int recursive_draw(struct frame *fr, cairo_t *cr, + ImageStore *is, + double min_y, double max_y) +{ + int i; + + draw_frame(cr, fr, is, min_y, max_y); + + for ( i=0; inum_children; i++ ) { + cairo_save(cr); + cairo_translate(cr, fr->children[i]->x, fr->children[i]->y); + recursive_draw(fr->children[i], cr, is, + min_y - fr->children[i]->y, + max_y - fr->children[i]->y); + cairo_restore(cr); + } + + return 0; +} + + +void wrap_frame(struct frame *fr, PangoContext *pc) +{ + int i; + double w; + + w = fr->w - fr->pad_l - fr->pad_r; + + for ( i=0; in_paras; i++ ) { + wrap_paragraph(fr->paras[i], pc, w, 0, 0); + } +} + + +int recursive_wrap(struct frame *fr, PangoContext *pc) +{ + int i; + + wrap_frame(fr, pc); + + for ( i=0; inum_children; i++ ) { + recursive_wrap(fr->children[i], pc); + } + + return 0; +} + + +struct frame *interp_and_shape(SCBlock *scblocks, Stylesheet *stylesheet, + SCCallbackList *cbl, ImageStore *is, + int slide_number, + PangoContext *pc, double w, double h, + PangoLanguage *lang) +{ + SCInterpreter *scin; + char snum[64]; + struct frame *top; + + top = frame_new(); + top->resizable = 0; + top->x = 0.0; + top->y = 0.0; + top->w = w; + top->h = h; + top->scblocks = scblocks; + + scin = sc_interp_new(pc, lang, is, top); + if ( scin == NULL ) { + fprintf(stderr, "Failed to set up interpreter.\n"); + frame_free(top); + return NULL; + } + + sc_interp_set_callbacks(scin, cbl); + + snprintf(snum, 63, "%i", slide_number); + sc_interp_set_constant(scin, SCCONST_SLIDENUMBER, snum); + + top->fontdesc = pango_font_description_copy(sc_interp_get_fontdesc(scin)); + top->col[0] = sc_interp_get_fgcol(scin)[0]; + top->col[1] = sc_interp_get_fgcol(scin)[1]; + top->col[2] = sc_interp_get_fgcol(scin)[2]; + top->col[3] = sc_interp_get_fgcol(scin)[3]; + + sc_interp_add_block(scin, scblocks, stylesheet); + + sc_interp_destroy(scin); + + return top; +} + + +static struct frame *render_sc_with_context(SCBlock *scblocks, + cairo_t *cr, double log_w, double log_h, + Stylesheet *stylesheet, SCCallbackList *cbl, + ImageStore *is, + int slide_number, PangoLanguage *lang, + PangoContext *pc) +{ + struct frame *top; + + cairo_rectangle(cr, 0.0, 0.0, log_w, log_h); + cairo_set_source_rgb(cr, 1.0, 1.0, 1.0); + cairo_fill(cr); + + top = interp_and_shape(scblocks, stylesheet, cbl, is, + slide_number, pc, log_w, log_h, lang); + + recursive_wrap(top, pc); + + recursive_draw(top, cr, is, 0.0, log_h); + + return top; +} + + +cairo_surface_t *render_sc(SCBlock *scblocks, int w, int h, + double log_w, double log_h, + Stylesheet *stylesheet, SCCallbackList *cbl, + ImageStore *is, + int slide_number, struct frame **ptop, + PangoLanguage *lang) +{ + cairo_surface_t *surf; + cairo_t *cr; + struct frame *top; + PangoContext *pc; + + surf = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h); + cr = cairo_create(surf); + pc = pango_cairo_create_context(cr); + cairo_scale(cr, w/log_w, h/log_h); + top = render_sc_with_context(scblocks, cr, log_w, log_h, + stylesheet, cbl, is, slide_number, + lang, pc); + g_object_unref(pc); + cairo_destroy(cr); + + *ptop = top; + + return surf; +} + + +int export_pdf(struct presentation *p, const char *filename) +{ + double r; + double w = 2048.0; + double scale; + cairo_surface_t *surf; + cairo_t *cr; + SCBlock *bl; + int i; + PangoContext *pc; + + r = p->slide_height / p->slide_width; + + surf = cairo_pdf_surface_create(filename, w, w*r); + if ( cairo_surface_status(surf) != CAIRO_STATUS_SUCCESS ) { + fprintf(stderr, _("Couldn't create Cairo surface\n")); + return 1; + } + + cr = cairo_create(surf); + scale = w / p->slide_width; + pc = pango_cairo_create_context(cr); + + i = 1; + bl = p->scblocks; + while ( bl != NULL ) { + + if ( safe_strcmp(sc_block_name(bl), "slide") != 0 ) { + bl = sc_block_next(bl); + continue; + } + + cairo_save(cr); + + cairo_scale(cr, scale, scale); + + cairo_rectangle(cr, 0.0, 0.0, p->slide_width, p->slide_height); + cairo_set_source_rgb(cr, 1.0, 1.0, 1.0); + cairo_fill(cr); + + render_sc_with_context(bl, cr, p->slide_width, + p->slide_height, p->stylesheet, NULL, + p->is, i, p->lang, pc); + + cairo_restore(cr); + + cairo_show_page(cr); + + bl = sc_block_next(bl); + i++; + + } + + g_object_unref(pc); + cairo_surface_finish(surf); + cairo_destroy(cr); + + return 0; +} -- cgit v1.2.3