92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/*
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* This file is part of NetSurf, http://netsurf.sourceforge.net/
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* Licensed under the GNU General Public License,
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* http://www.opensource.org/licenses/gpl-license
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* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
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*/
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/** \file
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* Page thumbnail creation (implementation).
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*
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* Thumbnails are created by redirecting output to a sprite and rendering the
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* page at a small scale.
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*/
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#include "oslib/colourtrans.h"
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#include "oslib/osspriteop.h"
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#include "netsurf/content/content.h"
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#include "netsurf/riscos/thumbnail.h"
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#include "netsurf/utils/log.h"
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/**
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* Create a thumbnail of a page.
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*
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* \param content content structure to thumbnail
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* \param area sprite area containing thumbnail sprite
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* \param sprite pointer to sprite
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* \param width sprite width / pixels
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* \param height sprite height / pixels
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*
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* The thumbnail is rendered in the given sprite.
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*/
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void thumbnail_create(struct content *content, osspriteop_area *area,
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osspriteop_header *sprite, int width, int height)
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{
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int size;
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int context1, context2, context3;
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float scale;
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osspriteop_save_area *save_area;
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os_error *error;
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scale = (float) width / (float) content->width;
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/* allocate save area */
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error = xosspriteop_read_save_area_size(osspriteop_PTR, area,
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(osspriteop_id) sprite, &size);
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if (error) {
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LOG(("xosspriteop_read_save_area_size failed: 0x%x: %s",
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error->errnum, error->errmess));
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return;
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}
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save_area = malloc((unsigned) size);
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if (!save_area) {
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LOG(("malloc failed"));
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return;
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}
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save_area->a[0] = 0;
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/* switch output to sprite */
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error = xosspriteop_switch_output_to_sprite(osspriteop_PTR, area,
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(osspriteop_id) sprite, save_area,
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0, &context1, &context2, &context3);
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if (error) {
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LOG(("xosspriteop_switch_output_to_sprite failed: 0x%x: %s",
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error->errnum, error->errmess));
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return;
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}
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/* clear background to white */
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colourtrans_set_gcol(os_COLOUR_WHITE, colourtrans_SET_BG,
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os_ACTION_OVERWRITE, 0);
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os_clg();
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/* render content */
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content_redraw(content, 0, height * 2, width * 2, height * 2,
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0, 0, width * 2, height * 2, scale);
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/* switch output back to screen */
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error = xosspriteop_switch_output_to_sprite(osspriteop_PTR,
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(osspriteop_area *) context1,
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(osspriteop_id) context2,
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(osspriteop_save_area *) context3,
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0, 0, 0, 0);
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if (error) {
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LOG(("xosspriteop_switch_output_to_sprite failed: %s",
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error->errmess));
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}
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free(save_area);
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}
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