/* * 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> #import "cocoa/plotter.h" #import "cocoa/font.h" #import "utils/nsoption.h" #import "desktop/font.h" #import "desktop/plotters.h" static NSLayoutManager *cocoa_prepare_layout_manager( const char *string, size_t length, const plot_font_style_t *style ); static CGFloat cocoa_layout_width( NSLayoutManager *layout ); static CGFloat cocoa_layout_width_chars( NSLayoutManager *layout, size_t characters ); static NSUInteger cocoa_glyph_for_location( NSLayoutManager *layout, CGFloat x ); static size_t cocoa_bytes_for_characters( const char *string, size_t characters ); static NSDictionary *cocoa_font_attributes( 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) { NSLayoutManager *layout = cocoa_prepare_layout_manager( string, length, style ); *width = cocoa_layout_width( layout ); 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 ); if (layout == nil) return false; NSUInteger glyphIndex = cocoa_glyph_for_location( layout, x ); NSUInteger chars = [layout characterIndexForGlyphAtIndex: glyphIndex]; if (chars >= [cocoa_text_storage length]) *char_offset = length; else *char_offset = cocoa_bytes_for_characters( string, chars ); *actual_x = cocoa_pt_to_px( NSMaxX( [layout boundingRectForGlyphRange: NSMakeRange( glyphIndex - 1, 1 ) inTextContainer: cocoa_text_container] ) ); 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) { NSLayoutManager *layout = cocoa_prepare_layout_manager( string, length, style ); if (layout == nil) return false; NSUInteger glyphIndex = cocoa_glyph_for_location( layout, x ); NSUInteger chars = [layout characterIndexForGlyphAtIndex: glyphIndex]; if (chars >= [cocoa_text_storage length]) { *char_offset = length; *actual_x = cocoa_layout_width( layout ); return true; } chars = [[cocoa_text_storage string] rangeOfString: @" " options: NSBackwardsSearch range: NSMakeRange( 0, chars + 1 )].location; if (chars == NSNotFound) { *char_offset = 0; *actual_x = 0; return true; } *char_offset = cocoa_bytes_for_characters( string, chars ); *actual_x = cocoa_layout_width_chars( layout, chars ); return true; } const struct font_functions nsfont = { nsfont_width, nsfont_position_in_string, nsfont_split }; #pragma mark - void cocoa_draw_string( CGFloat x, CGFloat y, const char *bytes, size_t length, const plot_font_style_t *style ) { NSLayoutManager *layout = cocoa_prepare_layout_manager( bytes, length, style ); if (layout == nil) return; NSFont *font = [cocoa_text_storage attribute: NSFontAttributeName atIndex: 0 effectiveRange: NULL]; CGFloat baseline = [layout defaultLineHeightForFont: font] * 3.0 / 4.0; NSRange glyphRange = [layout glyphRangeForTextContainer: cocoa_text_container]; [layout drawGlyphsForGlyphRange: glyphRange atPoint: NSMakePoint( x, y - baseline )]; } #pragma mark - static inline CGFloat cocoa_layout_width( NSLayoutManager *layout ) { if (layout == nil) return 0.0; return cocoa_pt_to_px( NSWidth( [layout usedRectForTextContainer: cocoa_text_container] ) ); } static inline CGFloat cocoa_layout_width_chars( NSLayoutManager *layout, size_t characters ) { NSUInteger glyphIndex = [layout glyphIndexForCharacterAtIndex: characters]; return cocoa_pt_to_px( [layout locationForGlyphAtIndex: glyphIndex].x ); } static inline NSUInteger cocoa_glyph_for_location( NSLayoutManager *layout, CGFloat x ) { CGFloat fraction = 0.0; NSUInteger glyphIndex = [layout glyphIndexForPoint: NSMakePoint( cocoa_px_to_pt( x ), 0 ) inTextContainer: cocoa_text_container fractionOfDistanceThroughGlyph: &fraction]; if (fraction >= 1.0) ++glyphIndex; return glyphIndex; } static inline size_t cocoa_bytes_for_characters( const char *string, size_t chars ) { 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++; } return offset; } 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; NSString *string = [[[NSString alloc] initWithBytes: bytes length:length encoding:NSUTF8StringEncoding] autorelease]; if (string == nil) 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]; } static NSString *oldString = 0; static plot_font_style_t oldStyle = { 0, 0, 0, 0, 0, 0 }; const bool styleChanged = memcmp( style, &oldStyle, sizeof oldStyle ) != 0; if ([oldString isEqualToString: string] && !styleChanged) { return layout; } [oldString release]; oldString = [string copy]; oldStyle = *style; static NSDictionary *attributes = nil; if (styleChanged || attributes == nil) { [attributes release]; attributes = [cocoa_font_attributes( style ) retain]; } [cocoa_text_storage release]; cocoa_text_storage = [[NSTextStorage alloc] initWithString: string attributes: attributes]; [cocoa_text_storage addLayoutManager: layout]; [layout ensureLayoutForTextContainer: cocoa_text_container]; return layout; } static NSString * const cocoa_font_families[PLOT_FONT_FAMILY_COUNT] = { [PLOT_FONT_FAMILY_SERIF] = @"Times", [PLOT_FONT_FAMILY_SANS_SERIF] = @"Helvetica", [PLOT_FONT_FAMILY_MONOSPACE] = @"Courier", [PLOT_FONT_FAMILY_CURSIVE] = @"Apple Chancery", [PLOT_FONT_FAMILY_FANTASY] = @"Marker Felt" }; static inline NSFont *cocoa_font_get_nsfont( const plot_font_style_t *style ) { NSFont *font = [NSFont fontWithName: cocoa_font_families[style->family] size: (CGFloat)style->size / FONT_SIZE_SCALE]; NSFontTraitMask traits = 0; if (style->flags & FONTF_ITALIC || style->flags & FONTF_OBLIQUE) traits |= NSItalicFontMask; if (style->flags & FONTF_SMALLCAPS) traits |= NSSmallCapsFontMask; if (style->weight > 400) traits |= NSBoldFontMask; if (0 != traits) { NSFontManager *fm = [NSFontManager sharedFontManager]; font = [fm convertFont: font toHaveTrait: traits]; } return font; } static inline 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]; }