e5b1a7d423
This unifies jpeg viewer, png viewer, and bmp viewer to one plugin, image viewer, so that you can navigate through different image formats. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28626 a1c6a512-1295-4272-9138-f99709370657
130 lines
3.5 KiB
C
130 lines
3.5 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* load image decoder.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "plugin.h"
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#include "imageviewer.h"
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#include "image_decoder.h"
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static const char *decoder_names[MAX_IMAGE_TYPES] = {
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"bmp",
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"jpeg",
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"png",
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};
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/* check file type by extention */
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enum image_type get_image_type(const char *name)
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{
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static const struct {
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char *ext;
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enum image_type type;
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} ext_list[] = {
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{ ".bmp", IMAGE_BMP },
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{ ".jpg", IMAGE_JPEG },
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{ ".jpe", IMAGE_JPEG },
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{ ".jpeg", IMAGE_JPEG },
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{ ".png", IMAGE_PNG },
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};
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const char *ext = rb->strrchr(name, '.');
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int i;
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if (!ext)
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return IMAGE_UNKNOWN;
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for (i = 0; i < (int)ARRAYLEN(ext_list); i++)
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{
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if (!rb->strcasecmp(ext, ext_list[i].ext))
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return ext_list[i].type;
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}
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return IMAGE_UNKNOWN;
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}
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static void *decoder_handle = NULL;
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const struct image_decoder *load_decoder(struct loader_info *loader_info)
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{
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const char *name;
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char filename[MAX_PATH];
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struct imgdec_header *hdr;
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struct lc_header *lc_hdr;
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if (loader_info->type < 0 || loader_info->type >= MAX_IMAGE_TYPES)
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{
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rb->splashf(2*HZ, "Unknown type: %d", loader_info->type);
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goto error;
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}
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release_decoder();
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name = decoder_names[loader_info->type];
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rb->snprintf(filename, MAX_PATH, VIEWERS_DIR "/%s.ovl", name);
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/* load decoder to the buffer. */
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decoder_handle = rb->lc_open(filename, loader_info->buffer, loader_info->size);
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if (!decoder_handle)
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{
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rb->splashf(2*HZ, "Can't open %s", filename);
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goto error;
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}
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hdr = rb->lc_get_header(decoder_handle);
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if (!hdr)
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{
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rb->splash(2*HZ, "Can't get header");
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goto error_close;
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}
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lc_hdr = &hdr->lc_hdr;
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if (lc_hdr->magic != PLUGIN_MAGIC || lc_hdr->target_id != TARGET_ID)
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{
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rb->splashf(2*HZ, "%s decoder: Incompatible model.", name);
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goto error_close;
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}
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if (lc_hdr->api_version != IMGDEC_API_VERSION)
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{
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rb->splashf(2*HZ, "%s decoder: Incompatible version.", name);
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goto error_close;
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}
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*(hdr->api) = rb;
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*(hdr->img_api) = loader_info->iv;
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/* set remaining buffer size to loader_info. decoder will
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* be loaded to the end of the buffer, so fix size only. */
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#if (CONFIG_PLATFORM & PLATFORM_NATIVE)
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loader_info->size = lc_hdr->load_addr - loader_info->buffer;
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#endif
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return hdr->decoder;
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error_close:
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release_decoder();
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error:
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return NULL;
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}
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void release_decoder(void)
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{
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if (decoder_handle != NULL)
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{
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rb->lc_close(decoder_handle);
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decoder_handle = NULL;
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}
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}
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