engine: imagelib: refactor image loading function

engine/common/imagelib/imagelib.h

@@ -91,7 +91,7 @@ typedef struct imglib_s
 	// global parms
 	rgba_t			fogParams;	// some water textures has info about underwater fog
 
-	image_hint_t		hint;		// hint for some loaders
+	int			hint;		// hint for some loaders
 	byte			*tempbuffer;	// for convert operations
 	int			cmd_flags;	// global imglib flags
 	int			force_flags;	// override cmd_flags
@@ -171,7 +171,6 @@ rgbdata_t *Image_Quantize( rgbdata_t *pic );
 // img_utils.c
 //
 void Image_Reset( void );
-rgbdata_t *ImagePack( void );
 byte *Image_Copy( size_t size );
 void Image_CopyParms( rgbdata_t *src );
 qboolean Image_ValidSize( const char *name );

engine/common/imagelib/img_main.c

@@ -110,20 +110,21 @@ void Image_Reset( void )
 	image.size = 0;
 }
 
-rgbdata_t *ImagePack( void )
+static rgbdata_t *ImagePack( void )
 {
-	rgbdata_t	*pack = Mem_Calloc( host.imagepool, sizeof( rgbdata_t ));
+	rgbdata_t	*pack;
 
 	// clear any force flags
 	image.force_flags = 0;
 
 	if( image.cubemap && image.num_sides != 6 )
 	{
-		// this never be happens, just in case
-		FS_FreeImage( pack );
+		// this never can happen, just in case
 		return NULL;
 	}
 
+	pack = Mem_Calloc( host.imagepool, sizeof( *pack ));
+
 	if( image.cubemap )
 	{
 		image.flags |= IMAGE_CUBEMAP;
@@ -163,7 +164,7 @@ FS_AddSideToPack
 
 ================
 */
-qboolean FS_AddSideToPack( const char *name, int adjust_flags )
+static qboolean FS_AddSideToPack( int adjust_flags )
 {
 	byte	*out, *flipped;
 	qboolean	resampled = false;
@@ -203,6 +204,88 @@ qboolean FS_AddSideToPack( const char *name, int adjust_flags )
 	return true;
 }
 
+static const loadpixformat_t *Image_GetLoadFormatForExtension( const char *ext )
+{
+	const loadpixformat_t *format;
+
+	if( !COM_CheckStringEmpty( ext ))
+		return NULL;
+
+	for( format = image.loadformats; format->formatstring; format++ )
+	{
+		if( !Q_stricmp( ext, format->ext ))
+			return format;
+	}
+
+	return NULL;
+}
+
+static qboolean Image_ProbeLoadBuffer_( const loadpixformat_t *fmt, const char *name, const byte *buf, size_t size, int override_hint )
+{
+	if( override_hint > 0 )
+		image.hint = override_hint;
+	else image.hint = fmt->hint;
+
+	return fmt->loadfunc( name, buf, size );
+}
+
+static qboolean Image_ProbeLoadBuffer( const loadpixformat_t *fmt, const char *name, const byte *buf, size_t size, int override_hint )
+{
+	if( size <= 0 )
+		return false;
+
+	// bruteforce all loaders
+	if( !fmt )
+	{
+		for( fmt = image.loadformats; fmt->formatstring; fmt++ )
+		{
+			if( Image_ProbeLoadBuffer_( fmt, name, buf, size, override_hint ))
+				 return true;
+		}
+
+		return false;
+	}
+
+	return Image_ProbeLoadBuffer_( fmt, name, buf, size, override_hint );
+}
+
+static qboolean Image_ProbeLoad_( const loadpixformat_t *fmt, const char *name, const char *suffix, int override_hint )
+{
+	qboolean success = false;
+	fs_offset_t filesize;
+	string path;
+	byte *f;
+
+	Q_snprintf( path, sizeof( path ), fmt->formatstring, name, suffix, fmt->ext );
+	f = FS_LoadFile( path, &filesize, false );
+
+	if( f )
+	{
+		success = Image_ProbeLoadBuffer( fmt, path, f, filesize, override_hint );
+
+		Mem_Free( f );
+	}
+
+	return success;
+}
+
+static qboolean Image_ProbeLoad( const loadpixformat_t *fmt, const char *name, const char *suffix, int override_hint )
+{
+	if( !fmt )
+	{
+		// bruteforce all formats to allow implicit extension
+		for( fmt = image.loadformats; fmt->formatstring; fmt++ )
+		{
+			if( Image_ProbeLoad_( fmt, name, suffix, override_hint ))
+				return true;
+		}
+
+		return false;
+	}
+
+	return Image_ProbeLoad_( fmt, name, suffix, override_hint );
+}
+
 /*
 ================
 FS_LoadImage
@@ -213,87 +296,35 @@ loading and unpack to rgba any known image
 rgbdata_t *FS_LoadImage( const char *filename, const byte *buffer, size_t size )
 {
 	const char	*ext = COM_FileExtension( filename );
-	string		path, loadname, sidename;
-	qboolean		anyformat = true;
+	string		loadname;
 	int		i;
-	fs_offset_t	filesize = 0;
-	const loadpixformat_t *format;
+	const loadpixformat_t *extfmt;
 	const cubepack_t	*cmap;
-	byte		*f;
 
 	Q_strncpy( loadname, filename, sizeof( loadname ));
 	Image_Reset(); // clear old image
 
-	if( COM_CheckStringEmpty( ext ))
-	{
-		// we needs to compare file extension with list of supported formats
-		// and be sure what is real extension, not a filename with dot
-		for( format = image.loadformats; format && format->formatstring; format++ )
-		{
-			if( !Q_stricmp( format->ext, ext ))
-			{
-				COM_StripExtension( loadname );
-				anyformat = false;
-				break;
-			}
-		}
-	}
+	// we needs to compare file extension with list of supported formats
+	// and be sure what is real extension, not a filename with dot
+	if(( extfmt = Image_GetLoadFormatForExtension( ext )))
+		COM_StripExtension( loadname );
 
 	// special mode: skip any checks, load file from buffer
 	if( filename[0] == '#' && buffer && size )
 		goto load_internal;
 
-	// now try all the formats in the selected list
-	for( format = image.loadformats; format && format->formatstring; format++)
-	{
-		if( anyformat || !Q_stricmp( ext, format->ext ))
-		{
-			Q_sprintf( path, format->formatstring, loadname, "", format->ext );
-			image.hint = format->hint;
-			f = FS_LoadFile( path, &filesize, false );
-
-			if( f && filesize > 0 )
-			{
-				if( format->loadfunc( path, f, filesize ))
-				{
-					Mem_Free( f ); // release buffer
-					return ImagePack(); // loaded
-				}
-				else Mem_Free( f ); // release buffer
-			}
-		}
-	}
+	if( Image_ProbeLoad( extfmt, loadname, "", -1 ))
+		return ImagePack();
 
 	// check all cubemap sides with package suffix
 	for( cmap = load_cubemap; cmap && cmap->type; cmap++ )
 	{
 		for( i = 0; i < 6; i++ )
 		{
-			// for support mixed cubemaps e.g. sky_ft.bmp, sky_rt.tga
-			// NOTE: all loaders must keep sides in one format for all
-			for( format = image.loadformats; format && format->formatstring; format++ )
+			if( Image_ProbeLoad( extfmt, loadname, cmap->type[i].suf, cmap->type[i].hint ) &&
+				 FS_AddSideToPack( cmap->type[i].flags )) // process flags to flip some sides
 			{
-				if( anyformat || !Q_stricmp( ext, format->ext ))
-				{
-					Q_sprintf( path, format->formatstring, loadname, cmap->type[i].suf, format->ext );
-					image.hint = (image_hint_t)cmap->type[i].hint; // side hint
-
-					f = FS_LoadFile( path, &filesize, false );
-					if( f && filesize > 0 )
-					{
-						// this name will be used only for tell user about problems
-						if( format->loadfunc( path, f, filesize ))
-						{
-							Q_snprintf( sidename, sizeof( sidename ), "%s%s.%s", loadname, cmap->type[i].suf, format->ext );
-							if( FS_AddSideToPack( sidename, cmap->type[i].flags )) // process flags to flip some sides
-							{
-								Mem_Free( f );
-								break; // loaded
-							}
-						}
-						Mem_Free( f );
-					}
-				}
+				break;
 			}
 
 			if( image.num_sides != i + 1 ) // check side
@@ -323,20 +354,13 @@ rgbdata_t *FS_LoadImage( const char *filename, const byte *buffer, size_t size )
 		return ImagePack(); // all done
 
 load_internal:
-	for( format = image.loadformats; format && format->formatstring; format++ )
+	if( buffer && size )
 	{
-		if( anyformat || !Q_stricmp( ext, format->ext ))
-		{
-			image.hint = format->hint;
-			if( buffer && size > 0  )
-			{
-				if( format->loadfunc( loadname, buffer, size ))
-					return ImagePack(); // loaded
-			}
-		}
+		if( Image_ProbeLoadBuffer( extfmt, loadname, buffer, size, -1 ))
+			return ImagePack();
 	}
 
-	if( filename[0] != '#' )
+	if( loadname[0] != '#' )
 		Con_Reportf( S_WARN "FS_LoadImage: couldn't load \"%s\"\n", loadname );
 
 	// clear any force flags
@@ -345,6 +369,8 @@ load_internal:
 	return NULL;
 }
 
+
+
 /*
 ================
 Image_Save