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Fix autofit for good

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This commit is contained in:
gargsms 2017-09-15 17:48:55 +05:30
parent 8f660ab45b
commit 7aacf26bcb
1 changed files with 33 additions and 36 deletions
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69
libvips/create/text.c
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@ -108,6 +108,12 @@ static PangoFontMap *vips_text_fontmap = NULL;
*/
static GMutex *vips_text_lock = NULL;
/* The maximum deviation to tolerate for autofitting the text
*
* TODO: Should the user be able to change this?
*/
static int const MAX_TOLERANCE = 10;
static void
vips_text_dispose( GObject *gobject )
{
@ -232,8 +238,7 @@ append_to_flist( FontSizeList *flist, FontSizeList *nflist )
static PangoRectangle
fit_to_bounds( VipsText *text,
int tolerance, char *name, int size, PangoRectangle rect,
FontSizeList *flist, bool coarse )
char *name, int size, PangoRectangle rect, FontSizeList *flist, bool coarse )
{
int buf_size = strlen( name ) + digits_in_num( size ) + 2;
int deviation;
@ -261,7 +266,7 @@ fit_to_bounds( VipsText *text,
text->layout = text_layout_new( text->context,
text->text, buf, text->width, text->spacing, text->align );
pango_layout_get_extents( text->layout, &rect, NULL );
pango_layout_get_extents( text->layout, NULL, &rect );
deviation = determine_deviation( text->width, text->height, rect );
@ -275,7 +280,7 @@ fit_to_bounds( VipsText *text,
// smallest deviation and then fit in small adjustments
if( search_flist( flist, size ) ) {
if( coarse ) {
return fit_to_bounds( text, tolerance, name, size, rect,
return fit_to_bounds( text, name, size, rect,
least_deviation_flist( flist ), false );
} else {
// We cannot do better than this because we will
@ -284,8 +289,8 @@ fit_to_bounds( VipsText *text,
}
}
if( deviation > tolerance ) {
return fit_to_bounds( text, tolerance, name, size, rect, flist, coarse );
if( deviation > MAX_TOLERANCE ) {
return fit_to_bounds( text, name, size, rect, flist, coarse );
} else {
return rect;
}
@ -300,7 +305,6 @@ vips_text_build( VipsObject *object )
FontSizeList *flist = (FontSizeList *) malloc( sizeof( FontSizeList ) );
PangoRectangle logical_rect;
PangoRectangle ink_rect;
int left;
int top;
int width;
@ -311,9 +315,6 @@ vips_text_build( VipsObject *object )
char *last;
bool is_font_size_provided = true;
// TODO: Should user be allowed to change this?
const int TOLERANCE = 100; // 10% * 10% for width, height
if( VIPS_OBJECT_CLASS( vips_text_parent_class )->build( object ) )
return( -1 );
@ -335,7 +336,7 @@ vips_text_build( VipsObject *object )
if( font_size ) {
strncat( font_name, text->font, last - text->font );
} else {
// Font was more than 1 word. "Fira Code" would have last
// Font was more than 1 MAX_word. "Fira Code" would have last
// pointing to "Code", leading atol to output 0
// Fix font_name back to the original in this case
strcpy( font_name, text->font );
@ -360,25 +361,24 @@ vips_text_build( VipsObject *object )
return( -1 );
}
pango_layout_get_extents( text->layout, &ink_rect, &logical_rect );
pango_layout_get_extents( text->layout, NULL, &logical_rect );
if( !is_font_size_provided ) {
if( text->height && text->width ) {
deviation = determine_deviation( text->width, text->height, ink_rect );
deviation = determine_deviation( text->width, text->height, logical_rect );
}
if( deviation > TOLERANCE ) {
if( deviation > MAX_TOLERANCE ) {
flist->size = font_size;
flist->deviation = deviation;
flist->area = PANGO_PIXELS( ink_rect.width ) * PANGO_PIXELS( ink_rect.height );
flist->area = PANGO_PIXELS( logical_rect.width ) * PANGO_PIXELS( logical_rect.height );
flist->next = NULL;
logical_rect = fit_to_bounds( text, TOLERANCE, font_name,
font_size, ink_rect, flist, true );
logical_rect = fit_to_bounds( text, font_name, font_size, logical_rect, flist, true );
}
// Logical rect does not help us with exact bounds of the text
pango_layout_get_extents( text->layout, &ink_rect, NULL );
pango_layout_get_extents( text->layout, NULL, &logical_rect );
}
@ -388,11 +388,6 @@ vips_text_build( VipsObject *object )
PANGO_PIXELS( logical_rect.y ),
PANGO_PIXELS( logical_rect.width ),
PANGO_PIXELS( logical_rect.height ) );
printf( "ink left = %d, top = %d, width = %d, height = %d\n",
PANGO_PIXELS( ink_rect.x ),
PANGO_PIXELS( ink_rect.y ),
PANGO_PIXELS( ink_rect.width ),
PANGO_PIXELS( ink_rect.height ) );
#endif /*DEBUG*/
left = PANGO_PIXELS( logical_rect.x );
@ -405,8 +400,8 @@ vips_text_build( VipsObject *object )
if( !is_font_size_provided && text->width && text->height ) {
left = 0;
top = 0;
width = PANGO_PIXELS( ink_rect.width );
height = PANGO_PIXELS( ink_rect.height );
width = PANGO_PIXELS( logical_rect.width );
height = PANGO_PIXELS( logical_rect.height );
// Since the layout is bigger than the requested dimensions, we
// scale the layout font description by the same scale
@ -424,46 +419,48 @@ vips_text_build( VipsObject *object )
pango_layout_set_font_description( text->layout, temp_fd );
pango_font_description_free( temp_fd );
pango_layout_get_extents( text->layout, &ink_rect, NULL );
// Overloading logical_rect as an ink rectangle here to determine the
// best gravity
// For most cases, gravities with north, south components are completely
// useless if we do positioning with logical rect
pango_layout_get_extents( text->layout, &logical_rect, NULL );
width = PANGO_PIXELS( ink_rect.width );
height = PANGO_PIXELS( ink_rect.height );
width = PANGO_PIXELS( logical_rect.width );
height = PANGO_PIXELS( logical_rect.height );
}
switch( text->gravity ) {
case VIPS_GRAVITY_CENTER:
left = ( text->width - width ) / 2;
top = ( text->height - height ) / 2;
break;
case VIPS_GRAVITY_NORTH:
top = ( height - text->height ) / 2;
left = ( text->width - width ) / 2;
break;
case VIPS_GRAVITY_EAST:
left = text->width - width;
top = ( text->height - height ) / 2;
break;
case VIPS_GRAVITY_SOUTH:
top = ( text->height - height ) / 2;
left = ( text->width - width ) / 2;
top = text->height - height;
break;
case VIPS_GRAVITY_WEST:
top = ( text->height - height ) / 2;
break;
case VIPS_GRAVITY_NORTH_EAST:
top = ( height - text->height ) / 2;
left = text->width - width;
break;
case VIPS_GRAVITY_SOUTH_EAST:
top = ( text->height - height ) / 2;
left = text->width - width;
top = text->height - height;
break;
case VIPS_GRAVITY_SOUTH_WEST:
top = text->height - height;
top = ( text->height - height ) / 2;
break;
case VIPS_GRAVITY_NORTH_WEST:
top = ( height - text->height ) / 2;
break;
default:
left = ( text->width - width ) / 2;
top = ( text->height - height ) / 2;
break;
}
left = -1 * left;