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Diffstat (limited to 'frontends/cocoa/font.m')
| -rw-r--r-- | frontends/cocoa/font.m | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/frontends/cocoa/font.m b/frontends/cocoa/font.m new file mode 100644 index 000000000..daed97fae --- /dev/null +++ b/frontends/cocoa/font.m @@ -0,0 +1,251 @@ +/* + * 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 "utils/nsoption.h" +#import "netsurf/layout.h" +#import "netsurf/plotters.h" + +#import "cocoa/coordinates.h" +#import "cocoa/plotter.h" +#import "cocoa/font.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 nserror cocoa_font_width(const plot_font_style_t *style, + const char *string, size_t length, + int *width) +{ + NSLayoutManager *layout; + layout = cocoa_prepare_layout_manager(string, length, style); + *width = cocoa_layout_width(layout); + return NSERROR_OK; +} + +static nserror cocoa_font_position(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 NSERROR_BAD_PARAMETER; + } + + 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 NSERROR_OK; +} + +static nserror cocoa_font_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 NSERROR_BAD_PARAMETER; + + 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 NSERROR_OK; + } + + chars = [[cocoa_text_storage string] rangeOfString:@" " options:NSBackwardsSearch range:NSMakeRange(0, chars + 1)].location; + if (chars == NSNotFound) { + *char_offset = 0; + *actual_x = 0; + return NSERROR_OK; + } + + *char_offset = cocoa_bytes_for_characters(string, chars); + *actual_x = cocoa_layout_width_chars(layout, chars); + + return NSERROR_OK; +} + +static struct gui_layout_table layout_table = { + .width = cocoa_font_width, + .position = cocoa_font_position, + .split = cocoa_font_split, +}; + +struct gui_layout_table *cocoa_layout_table = &layout_table; + +#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]; + 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 = [string copy]; + oldStyle = *style; + + static NSDictionary *attributes = nil; + if (styleChanged || attributes == nil) { + attributes = cocoa_font_attributes(style); + } + + 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]; +} |