netsurf/riscos/thumbnail.c

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/*
* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
* Copyright 2005 Richard Wilson <info@tinct.net>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf 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; version 2 of the License.
*
* NetSurf 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 <http://www.gnu.org/licenses/>.
*/
/** \file
* Page thumbnail creation (implementation).
*
* Thumbnails are created by redirecting output to a sprite and rendering the
* page at a small scale.
*/
#include <assert.h>
#include <string.h>
#include <swis.h>
#include "rufl.h"
#include "oslib/colourtrans.h"
#include "oslib/osfile.h"
#include "oslib/osspriteop.h"
#include "utils/nsoption.h"
#include "utils/log.h"
#include "content/content.h"
#include "content/hlcache.h"
#include "content/urldb.h"
#include "desktop/plotters.h"
#include "desktop/thumbnail.h"
#include "image/bitmap.h"
#include "riscos/bitmap.h"
#include "riscos/gui.h"
#include "riscos/oslib_pre7.h"
#include "riscos/thumbnail.h"
#include "riscos/tinct.h"
/* Whether we can use 32bpp sprites
*/
static int thumbnail_32bpp_available = -1;
/* Sprite output context saving
*/
struct thumbnail_save_area {
osspriteop_save_area *save_area;
int context1;
int context2;
int context3;
};
/* Internal prototypes
*/
static osspriteop_area *thumbnail_create_8bpp(struct bitmap *bitmap);
static void thumbnail_test(void);
static struct thumbnail_save_area* thumbnail_switch_output(
osspriteop_area *sprite_area,
osspriteop_header *sprite_header);
static void thumbnail_restore_output(struct thumbnail_save_area *save_area);
/**
* Create a thumbnail of a page.
*
* \param content content structure to thumbnail
* \param bitmap the bitmap to draw to
* \param url the URL the thumbnail belongs to, or NULL
*/
bool thumbnail_create(hlcache_handle *content, struct bitmap *bitmap,
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nsurl *url)
{
struct thumbnail_save_area *save_area;
osspriteop_area *sprite_area = NULL;
osspriteop_header *sprite_header = NULL;
struct redraw_context ctx = {
.interactive = false,
.background_images = true,
.plot = &ro_plotters
};
assert(content);
assert(bitmap);
/* check if we have access to 32bpp sprites natively */
if (thumbnail_32bpp_available == -1)
thumbnail_test();
/* if we don't support 32bpp sprites then we redirect to an 8bpp
* image and then convert back. */
if (thumbnail_32bpp_available != 1) {
sprite_area = thumbnail_create_8bpp(bitmap);
if (!sprite_area)
return false;
sprite_header = (osspriteop_header *)(sprite_area + 1);
} else {
const uint8_t *pixbufp = bitmap_get_buffer(bitmap);
if (!pixbufp || !bitmap->sprite_area)
return false;
sprite_area = bitmap->sprite_area;
sprite_header = (osspriteop_header *)(sprite_area + 1);
}
/* set up the plotters */
ro_plot_origin_x = 0;
ro_plot_origin_y = bitmap->height * 2;
/* switch output and redraw */
save_area = thumbnail_switch_output(sprite_area, sprite_header);
if (!save_area) {
if (thumbnail_32bpp_available != 1)
free(sprite_area);
return false;
}
rufl_invalidate_cache();
colourtrans_set_gcol(os_COLOUR_WHITE, colourtrans_SET_BG_GCOL,
os_ACTION_OVERWRITE, 0);
thumbnail_redraw(content, bitmap->width, bitmap->height, &ctx);
thumbnail_restore_output(save_area);
rufl_invalidate_cache();
/* if we changed to 8bpp then go back to 32bpp */
if (thumbnail_32bpp_available != 1) {
const uint8_t *pixbufp = bitmap_get_buffer(bitmap);
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_kernel_oserror *error;
if (!pixbufp || !bitmap->sprite_area) {
free(sprite_area);
return false;
}
error = _swix(Tinct_ConvertSprite, _INR(2,3),
sprite_header,
(osspriteop_header *)(bitmap->sprite_area + 1));
free(sprite_area);
if (error)
return false;
}
/* register the thumbnail with the URL */
if (url)
urldb_set_thumbnail(url, bitmap);
bitmap_modified(bitmap);
return true;
}
/**
* Convert a bitmap to 8bpp.
*
* \param bitmap the bitmap to convert
* \return a sprite area containing an 8bpp sprite
*/
osspriteop_area *thumbnail_convert_8bpp(struct bitmap *bitmap)
{
struct thumbnail_save_area *save_area;
osspriteop_area *sprite_area = NULL;
osspriteop_header *sprite_header = NULL;
sprite_area = thumbnail_create_8bpp(bitmap);
if (!sprite_area)
return NULL;
sprite_header = (osspriteop_header *)(sprite_area + 1);
/* switch output and redraw */
save_area = thumbnail_switch_output(sprite_area, sprite_header);
if (save_area == NULL) {
if (thumbnail_32bpp_available != 1)
free(sprite_area);
return false;
}
_swix(Tinct_Plot, _IN(2) | _IN(3) | _IN(4) | _IN(7),
(osspriteop_header *)(bitmap->sprite_area + 1),
0, 0,
tinct_ERROR_DIFFUSE);
thumbnail_restore_output(save_area);
if (sprite_header->image != sprite_header->mask) {
/* build the sprite mask from the alpha channel */
void *buf = bitmap_get_buffer(bitmap);
unsigned *dp = (unsigned *) buf;
if (!dp)
return sprite_area;
int w = bitmap_get_width(bitmap);
int h = bitmap_get_height(bitmap);
int dp_offset = bitmap_get_rowstride(bitmap) / 4 - w;
int mp_offset = ((sprite_header->width + 1) * 4) - w;
byte *mp = (byte*)sprite_header + sprite_header->mask;
bool alpha = ((unsigned)sprite_header->mode & 0x80000000U) != 0;
while (h-- > 0) {
int x = 0;
for(x = 0; x < w; x++) {
unsigned d = *dp++;
if (alpha)
*mp++ = (d >> 24) ^ 0xff;
else
*mp++ = (d < 0xff000000U) ? 0 : 0xff;
}
dp += dp_offset;
mp += mp_offset;
}
}
return sprite_area;
}
/**
* Creates an 8bpp canvas.
*
* \param bitmap the bitmap to clone the size of
* \return a sprite area containing an 8bpp sprite
*/
osspriteop_area *thumbnail_create_8bpp(struct bitmap *bitmap)
{
unsigned image_size = ((bitmap->width + 3) & ~3) * bitmap->height;
bool opaque = bitmap_get_opaque(bitmap);
osspriteop_header *sprite_header = NULL;
osspriteop_area *sprite_area = NULL;
unsigned area_size;
/* clone the sprite */
area_size = sizeof(osspriteop_area) +
sizeof(osspriteop_header) +
image_size +
2048;
if (!opaque) area_size += image_size;
sprite_area = (osspriteop_area *)malloc(area_size);
if (!sprite_area) {
LOG(("no memory for malloc()"));
return NULL;
}
sprite_area->size = area_size;
sprite_area->sprite_count = 1;
sprite_area->first = 16;
sprite_area->used = area_size;
sprite_header = (osspriteop_header *)(sprite_area + 1);
sprite_header->size = area_size - sizeof(osspriteop_area);
memset(sprite_header->name, 0x00, 12);
strcpy(sprite_header->name, "bitmap");
sprite_header->left_bit = 0;
sprite_header->height = bitmap->height - 1;
sprite_header->mode = os_MODE8BPP90X90;
sprite_header->right_bit = ((bitmap->width << 3) - 1) & 31;
sprite_header->width = ((bitmap->width + 3) >> 2) - 1;
sprite_header->image = sizeof(osspriteop_header) + 2048;
sprite_header->mask = sizeof(osspriteop_header) + 2048;
if (!opaque) sprite_header->mask += image_size;
/* create the palette. we don't read the necessary size like
* we really should as we know it's going to have 256 entries
* of 8 bytes = 2048. */
xcolourtrans_read_palette((osspriteop_area *)os_MODE8BPP90X90,
(osspriteop_id)0,
(os_palette *)(sprite_header + 1), 2048,
(colourtrans_palette_flags)(1 << 1), 0);
return sprite_area;
}
/**
* Check to see whether 32bpp sprites are available.
*
* Rather than using Wimp_ReadSysInfo we test if 32bpp sprites are available
* in case the user has a 3rd party patch to enable them.
*/
static void thumbnail_test(void)
{
unsigned int area_size;
osspriteop_area *sprite_area;
/* try to create a 1x1 32bpp sprite */
area_size = sizeof(osspriteop_area) +
sizeof(osspriteop_header) + sizeof(int);
if ((sprite_area = (osspriteop_area *)malloc(area_size)) == NULL) {
LOG(("Insufficient memory to perform sprite test."));
return;
}
sprite_area->size = area_size + 1;
sprite_area->sprite_count = 0;
sprite_area->first = 16;
sprite_area->used = 16;
if (xosspriteop_create_sprite(osspriteop_NAME, sprite_area,
"test", false, 1, 1, (os_mode)tinct_SPRITE_MODE))
thumbnail_32bpp_available = 0;
else
thumbnail_32bpp_available = 1;
free(sprite_area);
}
/**
* Switches output to the specified sprite and returns the previous context.
*/
static struct thumbnail_save_area* thumbnail_switch_output(
osspriteop_area *sprite_area,
osspriteop_header *sprite_header)
{
struct thumbnail_save_area *save_area;
int size;
/* create a save area */
save_area = calloc(sizeof(struct thumbnail_save_area), 1);
if (save_area == NULL) return NULL;
/* allocate OS_SpriteOp save area */
if (xosspriteop_read_save_area_size(osspriteop_PTR, sprite_area,
(osspriteop_id)sprite_header, &size)) {
free(save_area);
return NULL;
}
/* create the save area */
save_area->save_area = malloc((unsigned)size);
if (save_area->save_area == NULL) {
free(save_area);
return NULL;
}
save_area->save_area->a[0] = 0;
/* switch output to sprite */
if (xosspriteop_switch_output_to_sprite(osspriteop_PTR, sprite_area,
(osspriteop_id)sprite_header, save_area->save_area,
0, &save_area->context1, &save_area->context2,
&save_area->context3)) {
free(save_area->save_area);
free(save_area);
return NULL;
}
return save_area;
}
/**
* Restores output to the specified context, and destroys it.
*/
static void thumbnail_restore_output(struct thumbnail_save_area *save_area)
{
/* we don't care if we err, as there's nothing we can do about it */
xosspriteop_switch_output_to_sprite(osspriteop_PTR,
(osspriteop_area *)save_area->context1,
(osspriteop_id)save_area->context2,
(osspriteop_save_area *)save_area->context3,
0, 0, 0, 0);
free(save_area->save_area);
free(save_area);
}