bmp.c

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/*
 * Copyright 2006 Richard Wilson <info@tinct.net>
 * Copyright 2008 Sean Fox <dyntryx@gmail.com>
 *
 * 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
 * implementation of content handler for BMP images.
 */
 
#include <stdbool.h>
#include <stdlib.h>
#include <libnsbmp.h>
 
#include "utils/utils.h"
#include "utils/messages.h"
#include "netsurf/plotters.h"
#include "netsurf/bitmap.h"
#include "netsurf/content.h"
#include "content/llcache.h"
#include "content/content_protected.h"
#include "content/content_factory.h"
#include "desktop/gui_internal.h"
#include "desktop/bitmap.h"
 
#include "image/bmp.h"
 
/** bmp context. */
typedef struct nsbmp_content {
        struct content base;
 
        bmp_image *bmp; /** BMP image data */
 
        struct bitmap *bitmap;  /**< Created NetSurf bitmap */
} nsbmp_content;
 
/**
 * Callback for libnsbmp; forwards the call to bitmap_create()
 *
 * \param width width of image in pixels
 * \param height width of image in pixels
 * \param bmp_state A flag word indicating the initial state
 * \return An opaque struct bitmap, or NULL on memory exhaustion
 */
static void *nsbmp_bitmap_create(int width, int height, unsigned int bmp_state)
{
        unsigned int bitmap_state = BITMAP_NONE;
 
        /* set bitmap state based on bmp state */
        bitmap_state |= (bmp_state & BMP_OPAQUE) ? BITMAP_OPAQUE : 0;
        bitmap_state |= (bmp_state & BMP_CLEAR_MEMORY) ?
                        BITMAP_CLEAR : 0;
 
        /* return the created bitmap */
        return guit->bitmap->create(width, height, bitmap_state);
}
 
static nserror nsbmp_create_bmp_data(nsbmp_content *bmp)
{
        bmp_bitmap_callback_vt bmp_bitmap_callbacks = {
                .bitmap_create = nsbmp_bitmap_create,
                .bitmap_destroy = guit->bitmap->destroy,
                .bitmap_get_buffer = guit->bitmap->get_buffer,
        };
 
        bmp->bmp = calloc(1, sizeof(struct bmp_image));
        if (bmp->bmp == NULL) {
                content_broadcast_error(&bmp->base, NSERROR_NOMEM, NULL);
                return NSERROR_NOMEM;
        }
 
        bmp_create(bmp->bmp, &bmp_bitmap_callbacks);
 
        return NSERROR_OK;
}
 
static nserror
nsbmp_create(const struct content_handler *handler,
             lwc_string *imime_type,
             const struct http_parameter *params,
             llcache_handle *llcache,
             const char *fallback_charset,
             bool quirks,
             struct content **c)
{
        nsbmp_content *bmp;
        nserror error;
 
        bmp = calloc(1, sizeof(nsbmp_content));
        if (bmp == NULL)
                return NSERROR_NOMEM;
 
        error = content__init(&bmp->base, handler, imime_type, params,
                        llcache, fallback_charset, quirks);
        if (error != NSERROR_OK) {
                free(bmp);
                return error;
        }
 
        error = nsbmp_create_bmp_data(bmp);
        if (error != NSERROR_OK) {
                free(bmp);
                return error;
        }
 
        *c = (struct content *) bmp;
 
        return NSERROR_OK;
}
 
static bool nsbmp_convert(struct content *c)
{
        nsbmp_content *bmp = (nsbmp_content *) c;
        bmp_result res;
        uint32_t swidth;
        const uint8_t *data;
        size_t size;
        char *title;
 
        /* set the bmp data */
        data = content__get_source_data(c, &size);
 
        /* analyse the BMP */
        res = bmp_analyse(bmp->bmp, size, (unsigned char *) data);
        switch (res) {
                case BMP_OK:
                        break;
                case BMP_INSUFFICIENT_MEMORY:
                        content_broadcast_error(c, NSERROR_NOMEM, NULL);
                        return false;
                case BMP_INSUFFICIENT_DATA:
                case BMP_DATA_ERROR:
                        content_broadcast_error(c, NSERROR_BMP_ERROR, NULL);
                        return false;
        }
 
        /* Store our content width and description */
        c->width = bmp->bmp->width;
        c->height = bmp->bmp->height;
        swidth = sizeof(uint32_t) * bmp->bmp->width;
        c->size += (swidth * bmp->bmp->height) + 16 + 44;
 
        /* set title text */
        title = messages_get_buff("BMPTitle",
                        nsurl_access_leaf(llcache_handle_get_url(c->llcache)),
                        c->width, c->height);
        if (title != NULL) {
                content__set_title(c, title);
                free(title);
        }
 
        /* exit as a success */
        bmp->bitmap = bmp->bmp->bitmap;
 
        content_set_ready(c);
        content_set_done(c);
 
        /* Done: update status bar */
        content_set_status(c, "");
        return true;
}
 
static bool nsbmp_redraw(struct content *c, struct content_redraw_data *data,
                const struct rect *clip, const struct redraw_context *ctx)
{
        nsbmp_content *bmp = (nsbmp_content *) c;
        bitmap_flags_t flags = BITMAPF_NONE;
 
        if (bmp->bmp->decoded == false) {
                bmp_result res;
                res = bmp_decode(bmp->bmp);
                /* allow short or incomplete image data giving a partial image*/
                if ((res != BMP_OK) &&
                    (res != BMP_INSUFFICIENT_DATA) &&
                    (res != BMP_DATA_ERROR)) {
                        return false;
                }
 
                bitmap_format_to_client(bmp->bitmap, &(bitmap_fmt_t) {
                        .layout = BITMAP_LAYOUT_R8G8B8A8,
                });
                guit->bitmap->modified(bmp->bitmap);
        }
 
        if (data->repeat_x)
                flags |= BITMAPF_REPEAT_X;
        if (data->repeat_y)
                flags |= BITMAPF_REPEAT_Y;
 
        return (ctx->plot->bitmap(ctx,
                                  bmp->bitmap,
                                  data->x, data->y,
                                  data->width, data->height,
                                  data->background_colour,
                                  flags) == NSERROR_OK);
}
 
 
static void nsbmp_destroy(struct content *c)
{
        nsbmp_content *bmp = (nsbmp_content *) c;
 
        bmp_finalise(bmp->bmp);
        free(bmp->bmp);
}
 
 
static nserror nsbmp_clone(const struct content *old, struct content **newc)
{
        nsbmp_content *new_bmp;
        nserror error;
 
        new_bmp = calloc(1, sizeof(nsbmp_content));
        if (new_bmp == NULL)
                return NSERROR_NOMEM;
 
        error = content__clone(old, &new_bmp->base);
        if (error != NSERROR_OK) {
                content_destroy(&new_bmp->base);
                return error;
        }
 
        /* We "clone" the old content by replaying creation and conversion */
        error = nsbmp_create_bmp_data(new_bmp);
        if (error != NSERROR_OK) {
                content_destroy(&new_bmp->base);
                return error;
        }
 
        if (old->status == CONTENT_STATUS_READY || 
                        old->status == CONTENT_STATUS_DONE) {
                if (nsbmp_convert(&new_bmp->base) == false) {
                        content_destroy(&new_bmp->base);
                        return NSERROR_CLONE_FAILED;
                }
        }
 
        *newc = (struct content *) new_bmp;
 
        return NSERROR_OK;
}
 
static void *nsbmp_get_internal(const struct content *c, void *context)
{
        nsbmp_content *bmp = (nsbmp_content *)c;
 
        return bmp->bitmap;
}
 
static content_type nsbmp_content_type(void)
{
        return CONTENT_IMAGE;
}
 
static bool nsbmp_content_is_opaque(struct content *c)
{
        nsbmp_content *bmp = (nsbmp_content *)c;
 
        if (bmp->bitmap != NULL) {
                return guit->bitmap->get_opaque(bmp->bitmap);
        }
 
        return false;
}
 
static const content_handler nsbmp_content_handler = {
        .create = nsbmp_create,
        .data_complete = nsbmp_convert,
        .destroy = nsbmp_destroy,
        .redraw = nsbmp_redraw,
        .clone = nsbmp_clone,
        .get_internal = nsbmp_get_internal,
        .type = nsbmp_content_type,
        .is_opaque = nsbmp_content_is_opaque,
        .no_share = false,
};
 
static const char *nsbmp_types[] = {
        "application/bmp",
        "application/preview",
        "application/x-bmp",
        "application/x-win-bitmap",
        "image/bmp",
        "image/ms-bmp",
        "image/x-bitmap",
        "image/x-bmp",
        "image/x-ms-bmp",
        "image/x-win-bitmap",
        "image/x-windows-bmp",
        "image/x-xbitmap"
};
 
CONTENT_FACTORY_REGISTER_TYPES(nsbmp, nsbmp_types, nsbmp_content_handler);