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netsurf/cocoa/font.m
2013-05-28 14:16:10 +01:00

237 lines
7.7 KiB
Objective-C

/*
* 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 "css/css.h"
#import "utils/nsoption.h"
#import "render/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];
}