Differential D12312 Diff 41075 source/blender/blenloader/intern/readblenentry.c

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source/blender/blenloader/intern/readblenentry.c

Show First 20 Lines • Show All 210 Lines • ▼ Show 20 Lines	else if (bhead->code == ENDB) {
break;		break;
}		}
}		}

*r_tot_info_items = tot;		*r_tot_info_items = tot;
return infos;		return infos;
}		}

		static BHead blo_blendhandle_read_preview_rect(FileData fd,
		BHead *bhead,
		PreviewImage *result,
		const PreviewImage *preview_from_file,
		const int preview_index)
		{
		if (preview_from_file->rect[preview_index] && preview_from_file->w[preview_index] &&
		preview_from_file->h[preview_index]) {
		bhead = blo_bhead_next(fd, bhead);
		BLI_assert((preview_from_file->w[preview_index] * preview_from_file->h[preview_index] *
		sizeof(uint)) == bhead->len);
		result->rect[preview_index] = BLO_library_read_struct(fd, bhead, "PreviewImage Icon Rect");
		}
		mont29Unsubmitted Done Inline Actions This is very confusing, and a nice source of bugs, since signature of the function hints that it can randomly access a given `preview_index`, when this code can only even work once and with proper sequential `preview_index`. The loop over `preview_index` values should be done in this helper. And comment should make it clears that the `bhead` is 'consumed' too. mont29: This is very confusing, and a nice source of bugs, since signature of the function hints that…
		else {
		/* This should not be needed, but can happen in 'broken' .blend files,
		* better handle this gracefully than crashing. */
		BLI_assert(preview_from_file->rect[preview_index] == NULL &&
		preview_from_file->w[preview_index] == 0 &&
		preview_from_file->h[preview_index] == 0);
		result->rect[preview_index] = NULL;
		result->w[preview_index] = result->h[preview_index] = 0;
		}
		BKE_previewimg_finish(result, preview_index);

		return bhead;
		}

/**		/**
* Gets the previews of all the data-blocks in a file of a certain type		* Get the PreviewImage of a single data block in a file.
* (e.g. all the scene previews in a file).		* (e.g. all the scene previews in a file).
*		*
* \param bh: The blendhandle to access.		* \param bh: The blendhandle to access.
* \param ofblocktype: The type of names to get.		* \param ofblocktype: The type of names to get.
* \param r_tot_prev: The length of the returned list.		* \param name: Name of the block without the ID_ prefix, to read the preview image from.
* \return A BLI_linklist of PreviewImage. The PreviewImage links should be freed with malloc.		* \return PreviewImage or NULL when no preview Images have been found. Caller owns the returned
*/		*/
LinkNode BLO_blendhandle_get_previews(BlendHandle bh, int ofblocktype, int *r_tot_prev)		PreviewImage BLO_blendhandle_get_preview(BlendHandle bh, int ofblocktype, const char *name)
{		{
FileData fd = (FileData )bh;		FileData fd = (FileData )bh;
LinkNode *previews = NULL;		bool looking = false;
BHead *bhead;		const int sdna_preview_image = DNA_struct_find_nr(fd->filesdna, "PreviewImage");
int looking = 0;
PreviewImage *prv = NULL;
PreviewImage *new_prv = NULL;
int tot = 0;

for (bhead = blo_bhead_first(fd); bhead; bhead = blo_bhead_next(fd, bhead)) {		for (BHead *bhead = blo_bhead_first(fd); bhead; bhead = blo_bhead_next(fd, bhead)) {
if (bhead->code == ofblocktype) {		if (bhead->code == DATA) {
const char *idname = blo_bhead_id_name(fd, bhead);		if (looking && bhead->SDNAnr == sdna_preview_image) {
switch (GS(idname)) {		PreviewImage *preview_from_file = BLO_library_read_struct(fd, bhead, "PreviewImage");
case ID_MA: /* fall through */
case ID_TE: /* fall through */		if (!preview_from_file) {
case ID_IM: /* fall through */
case ID_WO: /* fall through */
case ID_LA: /* fall through */
case ID_OB: /* fall through */
case ID_GR: /* fall through */
case ID_SCE: /* fall through */
case ID_AC: /* fall through */
new_prv = MEM_callocN(sizeof(PreviewImage), "newpreview");
BLI_linklist_prepend(&previews, new_prv);
tot++;
looking = 1;
break;
default:
break;		break;
}		}
		mont29Unsubmitted Done Inline Actions `preview_from_file == NULL` mont29: `preview_from_file == NULL`
}
else if (bhead->code == DATA) {
if (looking) {
if (bhead->SDNAnr == DNA_struct_find_nr(fd->filesdna, "PreviewImage")) {
prv = BLO_library_read_struct(fd, bhead, "PreviewImage");

if (prv) {
memcpy(new_prv, prv, sizeof(PreviewImage));
if (prv->rect[0] && prv->w[0] && prv->h[0]) {
bhead = blo_bhead_next(fd, bhead);
BLI_assert((new_prv->w[0] * new_prv->h[0] * sizeof(uint)) == bhead->len);
new_prv->rect[0] = BLO_library_read_struct(fd, bhead, "PreviewImage Icon Rect");
}
else {
/* This should not be needed, but can happen in 'broken' .blend files,
* better handle this gracefully than crashing. */
BLI_assert(prv->rect[0] == NULL && prv->w[0] == 0 && prv->h[0] == 0);
new_prv->rect[0] = NULL;
new_prv->w[0] = new_prv->h[0] = 0;
}
BKE_previewimg_finish(new_prv, 0);

if (prv->rect[1] && prv->w[1] && prv->h[1]) {		PreviewImage *result = MEM_dupallocN(preview_from_file);
bhead = blo_bhead_next(fd, bhead);		for (int preview_index = 0; preview_index < NUM_ICON_SIZES; preview_index++) {
BLI_assert((new_prv->w[1] * new_prv->h[1] * sizeof(uint)) == bhead->len);		bhead = blo_blendhandle_read_preview_rect(
new_prv->rect[1] = BLO_library_read_struct(fd, bhead, "PreviewImage Image Rect");		fd, bhead, result, preview_from_file, preview_index);
}		}
else {		MEM_freeN(preview_from_file);
/* This should not be needed, but can happen in 'broken' .blend files,		return result;
* better handle this gracefully than crashing. */
BLI_assert(prv->rect[1] == NULL && prv->w[1] == 0 && prv->h[1] == 0);
new_prv->rect[1] = NULL;
new_prv->w[1] = new_prv->h[1] = 0;
}
BKE_previewimg_finish(new_prv, 1);
MEM_freeN(prv);
}
}
}		}
}		}
else if (bhead->code == ENDB) {		else if (looking \|\| bhead->code == ENDB) {
		/* We were looking for a preview image, but didn't find any belonging to block. So it doesn't
		* exist. */
break;		break;
}		}
else {		else if (bhead->code == ofblocktype) {
looking = 0;		const char *idname = blo_bhead_id_name(fd, bhead);
new_prv = NULL;		if (STREQ(&idname[2], name)) {
prv = NULL;		looking = true;
		}
}		}
}		}

*r_tot_prev = tot;		return NULL;
return previews;
}		}

/**		/**
* Gets the names of all the linkable data-block types available in a file.		* Gets the names of all the linkable data-block types available in a file.
* (e.g. "Scene", "Mesh", "Light", etc.).		* (e.g. "Scene", "Mesh", "Light", etc.).
*		*
* \param bh: The blendhandle to access.		* \param bh: The blendhandle to access.
* \return A BLI_linklist of strings. The string links should be freed with #MEM_freeN().		* \return A BLI_linklist of strings. The string links should be freed with #MEM_freeN().
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