mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-25 07:49:38 +03:00
5903845c4a
Tighten up error checking. When loading bitmaps from the disk cache, ensure they look valid. svn path=/import/netsurf/; revision=1862
320 lines
8.7 KiB
C
320 lines
8.7 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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* Copyright 2005 Richard Wilson <info@tinct.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 <assert.h>
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#include <string.h>
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#include <swis.h>
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#include "rufl.h"
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#include "oslib/colourtrans.h"
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#include "oslib/osfile.h"
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#include "oslib/osspriteop.h"
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#include "netsurf/content/content.h"
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#include "netsurf/content/url_store.h"
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#include "netsurf/desktop/plotters.h"
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#include "netsurf/image/bitmap.h"
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#include "netsurf/render/font.h"
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#include "netsurf/riscos/bitmap.h"
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#include "netsurf/riscos/gui.h"
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#include "netsurf/riscos/options.h"
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#include "netsurf/riscos/thumbnail.h"
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#include "netsurf/riscos/tinct.h"
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#include "netsurf/utils/log.h"
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/* Whether we can use 32bpp sprites
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*/
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static int thumbnail_32bpp_available = -1;
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/* Sprite output context saving
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*/
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struct thumbnail_save_area {
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osspriteop_save_area *save_area;
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int context1;
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int context2;
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int context3;
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};
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/* Internal prototypes
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*/
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static osspriteop_area *thumbnail_create_8bpp(struct bitmap *bitmap);
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static void thumbnail_test(void);
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static struct thumbnail_save_area* thumbnail_switch_output(
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osspriteop_area *sprite_area,
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osspriteop_header *sprite_header);
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static void thumbnail_restore_output(struct thumbnail_save_area *save_area);
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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 bitmap the bitmap to draw to
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* \param url the URL the thumnail belongs to, or NULL
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*/
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bool thumbnail_create(struct content *content, struct bitmap *bitmap,
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const char *url)
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{
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float scale = 1.0;
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struct thumbnail_save_area *save_area;
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osspriteop_area *sprite_area = NULL;
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osspriteop_header *sprite_header = NULL;
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_kernel_oserror *error;
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assert(content);
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assert(bitmap);
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/* check if we have access to 32bpp sprites natively */
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if (thumbnail_32bpp_available == -1)
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thumbnail_test();
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/* if we don't support 32bpp sprites then we redirect to an 8bpp
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* image and then convert back. */
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if (thumbnail_32bpp_available != 1) {
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sprite_area = thumbnail_create_8bpp(bitmap);
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if (!sprite_area)
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return false;
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sprite_header = (osspriteop_header *)(sprite_area + 1);
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} else {
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char *pixbufp = bitmap_get_buffer(bitmap);
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if (!pixbufp || !bitmap->sprite_area)
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return false;
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sprite_area = bitmap->sprite_area;
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sprite_header = (osspriteop_header *)(sprite_area + 1);
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}
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/* set up the plotters */
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plot = ro_plotters;
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ro_plot_origin_x = 0;
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ro_plot_origin_y = bitmap->height * 2;
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if (content->width)
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scale = (float)bitmap->width / (float)content->width;
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ro_plot_set_scale(scale);
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current_redraw_browser = NULL; /* no selection */
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/* switch output and redraw */
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save_area = thumbnail_switch_output(sprite_area, sprite_header);
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if (!save_area) {
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if (thumbnail_32bpp_available != 1)
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free(sprite_area);
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return false;
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}
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rufl_invalidate_cache();
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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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content_redraw(content, 0, 0, bitmap->width, bitmap->height,
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0, 0, bitmap->width, bitmap->height, scale, 0xFFFFFF);
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thumbnail_restore_output(save_area);
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rufl_invalidate_cache();
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/* if we changed to 8bpp then go back to 32bpp */
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if (thumbnail_32bpp_available != 1) {
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char *pixbufp = bitmap_get_buffer(bitmap);
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if (!pixbufp || !bitmap->sprite_area) {
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free(sprite_area);
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return false;
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}
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error = _swix(Tinct_ConvertSprite, _INR(2,3),
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sprite_header,
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(osspriteop_header *)(bitmap->sprite_area + 1));
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free(sprite_area);
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if (error)
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return false;
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}
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/* register the thumbnail with the URL */
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if (url)
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url_store_add_thumbnail(url, bitmap);
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bitmap_modified(bitmap);
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bitmap->persistent = true;
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return true;
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}
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/**
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* Convert a bitmap to 8bpp.
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*
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* \param bitmap the bitmap to convert
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* \return a sprite area containing an 8bpp sprite
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*/
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osspriteop_area *thumbnail_convert_8bpp(struct bitmap *bitmap)
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{
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struct thumbnail_save_area *save_area;
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osspriteop_area *sprite_area = NULL;
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osspriteop_header *sprite_header = NULL;
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sprite_area = thumbnail_create_8bpp(bitmap);
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if (!sprite_area)
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return NULL;
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sprite_header = (osspriteop_header *)(sprite_area + 1);
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/* switch output and redraw */
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save_area = thumbnail_switch_output(sprite_area, sprite_header);
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if (save_area == NULL) {
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if (thumbnail_32bpp_available != 1)
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free(sprite_area);
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return false;
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}
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_swix(Tinct_Plot, _IN(2) | _IN(3) | _IN(4) | _IN(7),
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(osspriteop_header *)(bitmap->sprite_area + 1),
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0, 0,
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tinct_ERROR_DIFFUSE);
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thumbnail_restore_output(save_area);
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return sprite_area;
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}
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/**
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* Creates an 8bpp canvas.
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*
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* \param bitmap the bitmap to clone the size of
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* \return a sprite area containing an 8bpp sprite
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*/
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osspriteop_area *thumbnail_create_8bpp(struct bitmap *bitmap)
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{
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unsigned int area_size;
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osspriteop_area *sprite_area = NULL;
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osspriteop_header *sprite_header = NULL;
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/* clone the sprite */
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area_size = sizeof(osspriteop_area) +
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sizeof(osspriteop_header) +
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((bitmap->width + 3) & ~3) * bitmap->height +
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2048;
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sprite_area = (osspriteop_area *)malloc(area_size);
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if (!sprite_area) {
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LOG(("no memory for malloc()"));
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return NULL;
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}
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sprite_area->size = area_size;
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sprite_area->sprite_count = 1;
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sprite_area->first = 16;
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sprite_area->used = area_size;
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sprite_header = (osspriteop_header *)(sprite_area + 1);
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sprite_header->size = area_size - sizeof(osspriteop_area);
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memset(sprite_header->name, 0x00, 12);
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strcpy(sprite_header->name, "bitmap");
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sprite_header->left_bit = 0;
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sprite_header->height = bitmap->height - 1;
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sprite_header->mode = os_MODE8BPP90X90;
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sprite_header->right_bit = ((bitmap->width << 3) - 1) & 31;
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sprite_header->width = ((bitmap->width + 3) >> 2) - 1;
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sprite_header->image = sizeof(osspriteop_header) + 2048;
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sprite_header->mask = sizeof(osspriteop_header) + 2048;
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/* create the palette. we don't read the necessary size like
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* we really should as we know it's going to have 256 entries
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* of 8 bytes = 2048. */
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xcolourtrans_read_palette((osspriteop_area *)os_MODE8BPP90X90,
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(osspriteop_id)0,
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(os_palette *)(sprite_header + 1), 2048,
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(colourtrans_palette_flags)(1 << 1), 0);
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return sprite_area;
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}
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/**
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* Check to see whether 32bpp sprites are available.
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*
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* Rather than using Wimp_ReadSysInfo we test if 32bpp sprites are available
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* in case the user has a 3rd party patch to enable them.
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*/
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static void thumbnail_test(void)
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{
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unsigned int area_size;
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osspriteop_area *sprite_area;
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/* try to create a 1x1 32bpp sprite */
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area_size = sizeof(osspriteop_area) +
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sizeof(osspriteop_header) + sizeof(int);
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if ((sprite_area = (osspriteop_area *)malloc(area_size)) == NULL) {
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LOG(("Insufficient memory to perform sprite test."));
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return;
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}
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sprite_area->size = area_size + 1;
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sprite_area->sprite_count = 0;
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sprite_area->first = 16;
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sprite_area->used = 16;
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if (xosspriteop_create_sprite(osspriteop_NAME, sprite_area,
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"test", false, 1, 1, (os_mode)tinct_SPRITE_MODE))
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thumbnail_32bpp_available = 0;
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else
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thumbnail_32bpp_available = 1;
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free(sprite_area);
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}
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/**
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* Switches output to the specified sprite and returns the previous context.
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*/
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static struct thumbnail_save_area* thumbnail_switch_output(
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osspriteop_area *sprite_area,
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osspriteop_header *sprite_header)
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{
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struct thumbnail_save_area *save_area;
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int size;
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/* create a save area */
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save_area = calloc(sizeof(struct thumbnail_save_area), 1);
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if (save_area == NULL) return NULL;
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/* allocate OS_SpriteOp save area */
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if (xosspriteop_read_save_area_size(osspriteop_PTR, sprite_area,
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(osspriteop_id)sprite_header, &size)) {
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free(save_area);
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return NULL;
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}
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/* create the save area */
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save_area->save_area = malloc((unsigned)size);
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if (save_area->save_area == NULL) {
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free(save_area);
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return NULL;
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}
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save_area->save_area->a[0] = 0;
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/* switch output to sprite */
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if (xosspriteop_switch_output_to_sprite(osspriteop_PTR, sprite_area,
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(osspriteop_id)sprite_header, save_area->save_area,
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0, &save_area->context1, &save_area->context2,
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&save_area->context3)) {
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free(save_area->save_area);
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free(save_area);
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return NULL;
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}
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return save_area;
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}
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/**
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* Restores output to the specified context, and destroys it.
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*/
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static void thumbnail_restore_output(struct thumbnail_save_area *save_area)
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{
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/* we don't care if we err, as there's nothing we can do about it */
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xosspriteop_switch_output_to_sprite(osspriteop_PTR,
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(osspriteop_area *)save_area->context1,
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(osspriteop_id)save_area->context2,
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(osspriteop_save_area *)save_area->context3,
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0, 0, 0, 0);
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free(save_area->save_area);
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free(save_area);
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}
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