mirror of
https://github.com/netsurf-browser/netsurf
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f61d7fe881
Thumnails now created with a palette to fix incorrect colour rendition. Thumnails output to a 32bpp sprite where possible. Thumnails oversampled to improve display if desired. svn path=/import/netsurf/; revision=744
367 lines
10 KiB
C
367 lines
10 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 2004 Richard Wilson <not_ginger_matt@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 <string.h>
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#include <swis.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/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 void thumbnail_test(void);
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static struct thumbnail_save_area* thumbnail_switch_output(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 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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float scale;
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osspriteop_area *oversampled_area = NULL;
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struct thumbnail_save_area *save_area;
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/* Check for 32bpp support in case we've been called for a sprite
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we didn't set up.
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*/
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if (thumbnail_32bpp_available == -1) thumbnail_test();
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/* Check our oversampling is within a usable range
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*/
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if (option_thumbnail_oversampling < 0) option_thumbnail_oversampling = 0;
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if (option_thumbnail_oversampling > 4) option_thumbnail_oversampling = 4;
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/* Get the oversampled sprite holder. We perform oversamling if either we
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want to oversample, or the output sprite is 8bpp and we can do 32bpp and
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thus improve the final rendition via dithering.
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*/
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if ((thumbnail_32bpp_available == 1) &&
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((option_thumbnail_oversampling > 0) || (sprite->mode != (os_mode)0x301680b5))) {
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oversampled_area = thumbnail_initialise(
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width << option_thumbnail_oversampling,
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height << option_thumbnail_oversampling,
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(os_mode)0x301680b5);
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}
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/* Oversample if we have an oversampled sprite, don't otherwise
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*/
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if (oversampled_area != NULL) {
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/* Scale up for oversampling
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*/
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width = width << option_thumbnail_oversampling;
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height = height << option_thumbnail_oversampling;
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/* Calculate the scale
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*/
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scale = (float) width / (float) content->width;
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/* Switch output and redraw oversampled
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*/
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save_area = thumbnail_switch_output(oversampled_area,
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(osspriteop_header *)(oversampled_area + 1));
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if (save_area == NULL) return;
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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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thumbnail_restore_output(save_area);
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/* xosspriteop_save_sprite_file(osspriteop_USER_AREA,
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oversampled_area, "oversample");
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*/
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/* Scale back
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*/
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width = width >> option_thumbnail_oversampling;
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height = height >> option_thumbnail_oversampling;
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/* Switch output to the final sprite
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*/
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save_area = thumbnail_switch_output(area, sprite);
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if (save_area == NULL) {
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free(oversampled_area);
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return;
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}
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/* Get Tinct to dither and bilinear filter back to what we want.
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*/
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_swix(Tinct_PlotScaled, _IN(2) | _IN(3) | _IN(4) | _IN(5) | _IN(6) | _IN(7),
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(char *)(oversampled_area + 1), 0, 0, width * 2, height * 2,
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(1<<1) | (1<<2));
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/* Restore output
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*/
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thumbnail_restore_output(save_area);
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/* xosspriteop_save_sprite_file(osspriteop_USER_AREA,
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area, "thumb_scaled");
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*/
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} else {
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/* Calculate the scale
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*/
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scale = (float) width / (float) content->width;
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/* Switch output and redraw
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*/
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save_area = thumbnail_switch_output(area, sprite);
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if (save_area == NULL) return;
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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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thumbnail_restore_output(save_area);
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/* xosspriteop_save_sprite_file(osspriteop_USER_AREA,
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area, "thumb");
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*/
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}
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}
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/**
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* Initialises a sprite.
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*
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* The sprite background cleared to white.
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* Any necessary palette data is set up to the default palette.
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* The sprite name is set to "thumbnail".
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*
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* @param width The sprite width
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* @param height The sprite height
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* @param mode The preferred mode (0x301680b5 or os_MODE8BPP90X90)
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* @return
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*/
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osspriteop_area* thumbnail_initialise(int width, int height, os_mode mode) {
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unsigned int area_size;
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unsigned int remaining_bytes;
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osspriteop_area *sprite_area;
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osspriteop_header *sprite_header;
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char *sprite_image;
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/* Check if we can use 32bpp sprites if we haven't already. By
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doing it this way we don't need to allocate lot of memory
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first which will probably not be available on machines that
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can't handle such sprites..
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*/
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if (thumbnail_32bpp_available == -1) thumbnail_test();
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/* If we can't handle 32bpp then we get 8bpp.
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*/
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if (thumbnail_32bpp_available != 1) mode = os_MODE8BPP90X90;
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/* Calculate our required memory
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*/
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area_size = sizeof(osspriteop_area) + sizeof(osspriteop_header);
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if (mode == (os_mode)0x301680b5) {
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area_size += width * height * 4;
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} else {
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area_size += ((width + 3) & ~3) * height + 2048;
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}
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/* Try to get enough memory
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*/
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if ((sprite_area = (osspriteop_area *)malloc(area_size)) == NULL) {
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LOG(("Insufficient memory to create thumbnail."));
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return NULL;
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}
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/* Initialise the sprite area
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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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/* Initialise the sprite header. We can't trust OS_SpriteOp to
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set up our palette properly due to insane legacy 8bpp palettes,
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so we do it all manually.
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*/
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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, "thumbnail");
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sprite_header->left_bit = 0;
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sprite_header->height = height - 1;
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sprite_header->mode = mode;
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if (mode == (os_mode)0x301680b5) {
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sprite_header->right_bit = 31;
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sprite_header->width = width - 1;
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sprite_header->image = sizeof(osspriteop_header);
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sprite_header->mask = sizeof(osspriteop_header);
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/* Clear to white, full opacity
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*/
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sprite_image = ((char *)sprite_header) + sprite_header->image;
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memset(sprite_image, 0xff, area_size - sizeof(osspriteop_area) -
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sizeof(osspriteop_header));
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} else {
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sprite_header->right_bit = ((width << 3) - 1) & 31;
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sprite_header->width = ((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
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like we really should as we know it's going to have
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256 entries of 8 bytes = 2048.
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*/
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xcolourtrans_read_palette((osspriteop_area *)mode, (osspriteop_id)0,
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(os_palette *)(sprite_header + 1), 2048,
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(colourtrans_palette_flags)(1 << 1), &remaining_bytes);
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/* Clear to white
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*/
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sprite_image = ((char *)sprite_header) + sprite_header->image;
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memset(sprite_image, 0xff, area_size - sizeof(osspriteop_area) -
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sizeof(osspriteop_header) - 2048);
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}
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/* xosfile_save_stamped("thumb", 0xff9,
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((char *)sprite_area) + 4,
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((char *)sprite_area) + area_size);
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*/
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/* Return our sprite area
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*/
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return sprite_area;
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}
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/*
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* Checks to see whether 32bpp sprites are available. Rather than
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* using Wimp_ReadSysInfo we test if 32bpp sprites are available in
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* 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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unsigned int area_size;
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osspriteop_area *sprite_area;
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/* Get enough memory for a 1x1 32bpp sprite
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*/
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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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/* Initialise the sprite area
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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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/* Try to create a 32bpp sprite
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*/
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if (xosspriteop_create_sprite(osspriteop_NAME, sprite_area,
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"test", false, 1, 1, (os_mode)0x301680b5)) {
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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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}
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/* Free our memory
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*/
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free(sprite_area);
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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(osspriteop_area *sprite_area,
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osspriteop_header *sprite_header) {
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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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*/
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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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*/
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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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*/
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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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*/
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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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/* 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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/* We don't care if we err, as there's nothing we can do about it
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*/
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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 our workspace
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*/
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free(save_area->save_area);
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free(save_area);
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}
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