NanoSVG: basic support for stylesheets.

Based on https://github.com/memononen/nanosvg/pull/175
This commit is contained in:
Alex Shvartzkop 2023-09-02 19:17:13 +03:00
parent 5bb89b300f
commit 2cd7c0636f
1 changed files with 120 additions and 5 deletions

View File

@ -352,6 +352,13 @@ typedef struct NSVGattrib
char visible;
} NSVGattrib;
typedef struct NSVGstyles
{
char* name;
char* description;
struct NSVGstyles* next;
} NSVGstyles;
typedef struct NSVGparser
{
NSVGattrib attr[NSVG_MAX_ATTR];
@ -361,6 +368,7 @@ typedef struct NSVGparser
int cpts;
NSVGpath* plist;
NSVGimage* image;
NSVGstyles* styles;
NSVGgradientData* gradients;
NSVGshape* shapesTail;
float viewMinx, viewMiny, viewWidth, viewHeight;
@ -368,6 +376,7 @@ typedef struct NSVGparser
float dpi;
char pathFlag;
char defsFlag;
char styleFlag;
} NSVGparser;
static void nsvg__xformIdentity( float* t )
@ -612,6 +621,21 @@ error:
}
static void nsvg__deleteStyles( NSVGstyles* style )
{
while( style )
{
NSVGstyles* next = style->next;
if( style->name != NULL )
free( style->name );
if( style->description != NULL )
free( style->description );
free( style );
style = next;
}
}
static void nsvg__deletePaths( NSVGpath* path )
{
while( path )
@ -652,6 +676,7 @@ static void nsvg__deleteParser( NSVGparser* p )
{
if( p != NULL )
{
nsvg__deleteStyles( p->styles );
nsvg__deletePaths( p->plist );
nsvg__deleteGradientData( p->gradients );
nsvgDelete( p->image );
@ -2108,6 +2133,18 @@ static int nsvg__parseAttr( NSVGparser* p, const char* name, const char* value )
strncpy( attr->id, value, 63 );
attr->id[63] = '\0';
}
else if( strcmp( name, "class" ) == 0 )
{
NSVGstyles* style = p->styles;
while( style )
{
if( strcmp( style->name + 1, value ) == 0 )
{
nsvg__parseStyle( p, style->description );
}
style = style->next;
}
}
else
{
return 0;
@ -3352,7 +3389,7 @@ static void nsvg__startElement( void* ud, const char* el, const char** attr )
if( p->defsFlag )
{
// Skip everything but gradients in defs
// Skip everything but gradients and styles in defs
if( strcmp( el, "linearGradient" ) == 0 )
{
nsvg__parseGradient( p, attr, NSVG_PAINT_LINEAR_GRADIENT );
@ -3365,6 +3402,10 @@ static void nsvg__startElement( void* ud, const char* el, const char** attr )
{
nsvg__parseGradientStop( p, attr );
}
else if( strcmp( el, "style" ) == 0 )
{
p->styleFlag = 1;
}
return;
}
@ -3376,7 +3417,7 @@ static void nsvg__startElement( void* ud, const char* el, const char** attr )
}
else if( strcmp( el, "path" ) == 0 )
{
if( p->pathFlag ) // Do not allow nested paths.
if( p->pathFlag ) // Do not allow nested paths.
return;
nsvg__pushAttr( p );
@ -3439,6 +3480,10 @@ static void nsvg__startElement( void* ud, const char* el, const char** attr )
{
nsvg__parseSVG( p, attr );
}
else if( strcmp( el, "style" ) == 0 )
{
p->styleFlag = 1;
}
}
@ -3458,14 +3503,84 @@ static void nsvg__endElement( void* ud, const char* el )
{
p->defsFlag = 0;
}
else if( strcmp( el, "style" ) == 0 )
{
p->styleFlag = 0;
}
}
static char* nsvg__strndup( const char* s, size_t n )
{
char* result;
size_t len = strlen( s );
if( n < len )
len = n;
result = (char*) malloc( len + 1 );
if( !result )
return 0;
result[len] = '\0';
return (char*) memcpy( result, s, len );
}
static void nsvg__content( void* ud, const char* s )
{
NSVG_NOTUSED( ud );
NSVG_NOTUSED( s );
// empty
NSVGparser* p = (NSVGparser*) ud;
if( p->styleFlag )
{
int state = 0;
int class_count = 0;
const char* start = s;
while( *s )
{
char c = *s;
if( state == 2 )
{
if( c == '{' )
{
start = s + 1;
}
else if( c == '}' )
{
NSVGstyles* style = p->styles;
while( class_count > 0 )
{
style->description = nsvg__strndup( start, (size_t) ( s - start ) );
style = style->next;
--class_count;
}
state = 0;
}
}
else if( nsvg__isspace( c ) || c == '{' || c == ',' )
{
if( state == 1 )
{
if( *start == '.' )
{
NSVGstyles* next = p->styles;
p->styles = (NSVGstyles*) malloc( sizeof( NSVGstyles ) );
p->styles->description = NULL;
p->styles->next = next;
p->styles->name = nsvg__strndup( start, (size_t) ( s - start ) );
++class_count;
}
start = s + 1;
state = c == ',' ? 0 : 2;
}
}
else if( state == 0 )
{
start = s;
state = 1;
}
s++;
}
}
}