mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-12-12 23:37:16 +03:00
244 lines
8.1 KiB
Objective-C
244 lines
8.1 KiB
Objective-C
/*
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* Copyright 2011 Sven Weidauer <sven.weidauer@gmail.com>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#import <Cocoa/Cocoa.h>
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#import "cocoa/plotter.h"
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#import "cocoa/font.h"
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#import "utils/nsoption.h"
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#import "netsurf/layout.h"
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#import "desktop/plotters.h"
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static NSLayoutManager *cocoa_prepare_layout_manager( const char *string, size_t length,
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const plot_font_style_t *style );
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static CGFloat cocoa_layout_width( NSLayoutManager *layout );
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static CGFloat cocoa_layout_width_chars( NSLayoutManager *layout, size_t characters );
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static NSUInteger cocoa_glyph_for_location( NSLayoutManager *layout, CGFloat x );
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static size_t cocoa_bytes_for_characters( const char *string, size_t characters );
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static NSDictionary *cocoa_font_attributes( const plot_font_style_t *style );
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static NSTextStorage *cocoa_text_storage = nil;
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static NSTextContainer *cocoa_text_container = nil;
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static nserror cocoa_font_width(const plot_font_style_t *style,
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const char *string, size_t length,
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int *width)
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{
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NSLayoutManager *layout;
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layout = cocoa_prepare_layout_manager( string, length, style );
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*width = cocoa_layout_width( layout );
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return NSERROR_OK;
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}
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static nserror cocoa_font_position(const plot_font_style_t *style,
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const char *string, size_t length,
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int x, size_t *char_offset, int *actual_x)
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{
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NSLayoutManager *layout = cocoa_prepare_layout_manager( string, length, style );
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if (layout == nil) {
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return NSERROR_BAD_PARAMETER;
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}
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NSUInteger glyphIndex = cocoa_glyph_for_location( layout, x );
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NSUInteger chars = [layout characterIndexForGlyphAtIndex: glyphIndex];
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if (chars >= [cocoa_text_storage length]) *char_offset = length;
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else *char_offset = cocoa_bytes_for_characters( string, chars );
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*actual_x = cocoa_pt_to_px( NSMaxX( [layout boundingRectForGlyphRange: NSMakeRange( glyphIndex - 1, 1 )
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inTextContainer: cocoa_text_container] ) );
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return NSERROR_OK;
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}
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static nserror cocoa_font_split(const plot_font_style_t *style,
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const char *string, size_t length,
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int x, size_t *char_offset, int *actual_x)
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{
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NSLayoutManager *layout = cocoa_prepare_layout_manager( string, length, style );
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if (layout == nil) return NSERROR_BAD_PARAMETER;
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NSUInteger glyphIndex = cocoa_glyph_for_location( layout, x );
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NSUInteger chars = [layout characterIndexForGlyphAtIndex: glyphIndex];
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if (chars >= [cocoa_text_storage length]) {
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*char_offset = length;
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*actual_x = cocoa_layout_width( layout );
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return NSERROR_OK;
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}
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chars = [[cocoa_text_storage string] rangeOfString: @" " options: NSBackwardsSearch range: NSMakeRange( 0, chars + 1 )].location;
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if (chars == NSNotFound) {
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*char_offset = 0;
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*actual_x = 0;
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return NSERROR_OK;
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}
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*char_offset = cocoa_bytes_for_characters( string, chars );
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*actual_x = cocoa_layout_width_chars( layout, chars );
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return NSERROR_OK;
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}
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static struct gui_layout_table layout_table = {
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.width = cocoa_font_width,
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.position = cocoa_font_position,
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.split = cocoa_font_split,
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};
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struct gui_layout_table *cocoa_layout_table = &layout_table;
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#pragma mark -
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void cocoa_draw_string( CGFloat x, CGFloat y, const char *bytes, size_t length, const plot_font_style_t *style )
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{
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NSLayoutManager *layout = cocoa_prepare_layout_manager( bytes, length, style );
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if (layout == nil) return;
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NSFont *font = [cocoa_text_storage attribute: NSFontAttributeName atIndex: 0 effectiveRange: NULL];
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CGFloat baseline = [layout defaultLineHeightForFont: font] * 3.0 / 4.0;
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NSRange glyphRange = [layout glyphRangeForTextContainer: cocoa_text_container];
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[layout drawGlyphsForGlyphRange: glyphRange atPoint: NSMakePoint( x, y - baseline )];
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}
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#pragma mark -
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static inline CGFloat cocoa_layout_width( NSLayoutManager *layout )
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{
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if (layout == nil) return 0.0;
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return cocoa_pt_to_px( NSWidth( [layout usedRectForTextContainer: cocoa_text_container] ) );
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}
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static inline CGFloat cocoa_layout_width_chars( NSLayoutManager *layout, size_t characters )
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{
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NSUInteger glyphIndex = [layout glyphIndexForCharacterAtIndex: characters];
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return cocoa_pt_to_px( [layout locationForGlyphAtIndex: glyphIndex].x );
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}
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static inline NSUInteger cocoa_glyph_for_location( NSLayoutManager *layout, CGFloat x )
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{
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CGFloat fraction = 0.0;
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NSUInteger glyphIndex = [layout glyphIndexForPoint: NSMakePoint( cocoa_px_to_pt( x ), 0 )
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inTextContainer: cocoa_text_container
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fractionOfDistanceThroughGlyph: &fraction];
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if (fraction >= 1.0) ++glyphIndex;
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return glyphIndex;
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}
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static inline size_t cocoa_bytes_for_characters( const char *string, size_t chars )
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{
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size_t offset = 0;
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while (chars-- > 0) {
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uint8_t ch = ((uint8_t *)string)[offset];
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if (0xC2 <= ch && ch <= 0xDF) offset += 2;
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else if (0xE0 <= ch && ch <= 0xEF) offset += 3;
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else if (0xF0 <= ch && ch <= 0xF4) offset += 4;
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else offset++;
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}
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return offset;
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}
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static NSLayoutManager *cocoa_prepare_layout_manager( const char *bytes, size_t length,
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const plot_font_style_t *style )
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{
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if (NULL == bytes || 0 == length) return nil;
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NSString *string = [[[NSString alloc] initWithBytes: bytes length:length encoding:NSUTF8StringEncoding] autorelease];
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if (string == nil) return nil;
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static NSLayoutManager *layout = nil;
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if (nil == layout) {
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cocoa_text_container = [[NSTextContainer alloc] initWithContainerSize: NSMakeSize( CGFLOAT_MAX, CGFLOAT_MAX )];
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[cocoa_text_container setLineFragmentPadding: 0];
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layout = [[NSLayoutManager alloc] init];
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[layout addTextContainer: cocoa_text_container];
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}
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static NSString *oldString = 0;
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static plot_font_style_t oldStyle = { 0, 0, 0, 0, 0, 0 };
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const bool styleChanged = memcmp( style, &oldStyle, sizeof oldStyle ) != 0;
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if ([oldString isEqualToString: string] && !styleChanged) {
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return layout;
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}
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[oldString release];
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oldString = [string copy];
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oldStyle = *style;
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static NSDictionary *attributes = nil;
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if (styleChanged || attributes == nil) {
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[attributes release];
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attributes = [cocoa_font_attributes( style ) retain];
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}
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[cocoa_text_storage release];
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cocoa_text_storage = [[NSTextStorage alloc] initWithString: string attributes: attributes];
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[cocoa_text_storage addLayoutManager: layout];
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[layout ensureLayoutForTextContainer: cocoa_text_container];
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return layout;
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}
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static NSString * const cocoa_font_families[PLOT_FONT_FAMILY_COUNT] = {
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[PLOT_FONT_FAMILY_SERIF] = @"Times",
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[PLOT_FONT_FAMILY_SANS_SERIF] = @"Helvetica",
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[PLOT_FONT_FAMILY_MONOSPACE] = @"Courier",
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[PLOT_FONT_FAMILY_CURSIVE] = @"Apple Chancery",
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[PLOT_FONT_FAMILY_FANTASY] = @"Marker Felt"
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};
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static inline NSFont *cocoa_font_get_nsfont( const plot_font_style_t *style )
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{
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NSFont *font = [NSFont fontWithName: cocoa_font_families[style->family]
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size: (CGFloat)style->size / FONT_SIZE_SCALE];
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NSFontTraitMask traits = 0;
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if (style->flags & FONTF_ITALIC || style->flags & FONTF_OBLIQUE) traits |= NSItalicFontMask;
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if (style->flags & FONTF_SMALLCAPS) traits |= NSSmallCapsFontMask;
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if (style->weight > 400) traits |= NSBoldFontMask;
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if (0 != traits) {
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NSFontManager *fm = [NSFontManager sharedFontManager];
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font = [fm convertFont: font toHaveTrait: traits];
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}
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return font;
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}
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static inline NSDictionary *cocoa_font_attributes( const plot_font_style_t *style )
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{
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return [NSDictionary dictionaryWithObjectsAndKeys:
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cocoa_font_get_nsfont( style ), NSFontAttributeName,
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cocoa_convert_colour( style->foreground ), NSForegroundColorAttributeName,
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nil];
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}
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