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Diffstat (limited to 'cocoa/font.m')
| -rw-r--r-- | cocoa/font.m | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/cocoa/font.m b/cocoa/font.m new file mode 100644 index 000000000..634bbb7c5 --- /dev/null +++ b/cocoa/font.m @@ -0,0 +1,177 @@ +/* + * Copyright 2011 Sven Weidauer <sven.weidauer@gmail.com> + * + * This file is part of NetSurf, http://www.netsurf-browser.org/ + * + * NetSurf is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * NetSurf is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#import <Cocoa/Cocoa.h> + +#include <inttypes.h> + +#include <assert.h> + +#include "css/css.h" +#include "render/font.h" +#include "desktop/options.h" + +#import "font.h" +#import "plotter.h" + +static NSLayoutManager *cocoa_prepare_layout_manager( const char *string, size_t length, + const plot_font_style_t *style ); +static NSTextStorage *cocoa_text_storage = nil; +static NSTextContainer *cocoa_text_container = nil; + +static bool nsfont_width(const plot_font_style_t *style, + const char *string, size_t length, + int *width) +{ + NSCParameterAssert( NULL != width ); + + NSLayoutManager *layout = cocoa_prepare_layout_manager( string, length, style ); + *width = NULL != layout ? NSWidth( [layout usedRectForTextContainer: cocoa_text_container] ) : 0; + return true; +} + +static bool nsfont_position_in_string(const plot_font_style_t *style, + const char *string, size_t length, + int x, size_t *char_offset, int *actual_x) +{ + NSLayoutManager *layout = cocoa_prepare_layout_manager( string, length, style ); + NSUInteger glyphIndex = [layout glyphIndexForPoint: NSMakePoint( x, 0 ) + inTextContainer: cocoa_text_container + fractionOfDistanceThroughGlyph: NULL]; + NSUInteger chars = [layout characterIndexForGlyphAtIndex: glyphIndex]; + + size_t offset = 0; + while (chars > 0) { + uint8_t ch = ((uint8_t *)string)[offset]; + + if (0xC2 <= ch && ch <= 0xDF) offset += 2; + else if (0xE0 <= ch && ch <= 0xEF) offset += 3; + else if (0xF0 <= ch && ch <= 0xF4) offset += 4; + else offset++; + + --chars; + } + + *char_offset = offset; + *actual_x = [layout locationForGlyphAtIndex: glyphIndex].x; + + return true; +} + +static bool nsfont_split(const plot_font_style_t *style, + const char *string, size_t length, + int x, size_t *char_offset, int *actual_x) +{ + nsfont_position_in_string(style, string, length, x, char_offset, + actual_x); + if (*char_offset == length) return true; + + while ((string[*char_offset] != ' ') && (*char_offset > 0)) + (*char_offset)--; + + return true; +} + + +static NSString *cocoa_font_family_name( plot_font_generic_family_t family ) +{ + switch (family) { + case PLOT_FONT_FAMILY_SERIF: return @"Times"; + case PLOT_FONT_FAMILY_SANS_SERIF: return @"Helvetica"; + case PLOT_FONT_FAMILY_MONOSPACE: return @"Courier"; + case PLOT_FONT_FAMILY_CURSIVE: return @"Apple Chancery"; + case PLOT_FONT_FAMILY_FANTASY: return @"Marker Felt"; + default: return nil; + } +} + +static NSFont *cocoa_font_get_nsfont( const plot_font_style_t *style ) +{ + return [NSFont fontWithName: cocoa_font_family_name( style->family ) + size: (CGFloat)style->size / FONT_SIZE_SCALE]; +} + +NSDictionary *cocoa_font_attributes( const plot_font_style_t *style ) +{ + return [NSDictionary dictionaryWithObjectsAndKeys: + cocoa_font_get_nsfont( style ), NSFontAttributeName, + cocoa_convert_colour( style->foreground ), NSForegroundColorAttributeName, + nil]; +} + +static NSString *cocoa_string_from_utf8_characters( const char *string, size_t characters ) +{ + if (NULL == string || 0 == characters) return nil; + + return [[[NSString alloc] initWithBytes: string length:characters encoding:NSUTF8StringEncoding] autorelease]; +} + + +static NSLayoutManager *cocoa_prepare_layout_manager( const char *bytes, size_t length, + const plot_font_style_t *style ) +{ + if (NULL == bytes || 0 == length) return nil; + + static NSLayoutManager *layout = nil; + + if (nil == layout) { + cocoa_text_container = [[NSTextContainer alloc] initWithContainerSize: NSMakeSize( CGFLOAT_MAX, CGFLOAT_MAX )]; + [cocoa_text_container setLineFragmentPadding: 0]; + + layout = [[NSLayoutManager alloc] init]; + [layout addTextContainer: cocoa_text_container]; + + cocoa_text_storage = [[NSTextStorage alloc] init]; + [cocoa_text_storage addLayoutManager: layout]; + } + + + NSString *string = cocoa_string_from_utf8_characters( bytes, length ); + if (nil == string) return nil; + + NSDictionary *attributes = cocoa_font_attributes( style ); + NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString: string attributes: attributes]; + if (![attributedString isEqualToAttributedString: cocoa_text_storage]) { + [cocoa_text_storage setAttributedString: attributedString]; + [layout ensureLayoutForTextContainer: cocoa_text_container]; + } + [attributedString release]; + + + return layout; +} + +void cocoa_draw_string( int x, int y, const char *bytes, size_t length, const plot_font_style_t *style ) +{ + NSLayoutManager *layout = cocoa_prepare_layout_manager( bytes, length, style ); + + if ([cocoa_text_storage length] > 0) { + NSFont *font = [cocoa_text_storage attribute: NSFontAttributeName atIndex: 0 effectiveRange: NULL]; + CGFloat baseline = [layout defaultBaselineOffsetForFont: font]; + + NSRange glyphRange = [layout glyphRangeForTextContainer: cocoa_text_container]; + [layout drawGlyphsForGlyphRange: glyphRange atPoint: NSMakePoint( x, y - baseline )]; + } +} + +const struct font_functions nsfont = { + nsfont_width, + nsfont_position_in_string, + nsfont_split +}; + |