netsurf/cocoa/plotter.m

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/*
* 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/>.
*/
#include <Cocoa/Cocoa.h>
#import "cocoa/font.h"
#import "cocoa/plotter.h"
#import "cocoa/bitmap.h"
#import "desktop/plotters.h"
#import "desktop/plot_style.h"
#import "utils/log.h"
#import "css/utils.h"
static void cocoa_plot_render_path(NSBezierPath *path,const plot_style_t *pstyle);
static void cocoa_plot_path_set_stroke_pattern(NSBezierPath *path,const plot_style_t *pstyle);
static inline void cocoa_center_pixel( bool x, bool y );
static NSRect cocoa_plot_clip_rect;
#define colour_red_component( c ) (((c) >> 0) & 0xFF)
#define colour_green_component( c ) (((c) >> 8) & 0xFF)
#define colour_blue_component( c ) (((c) >> 16) & 0xFF)
#define colour_alpha_component( c ) (((c) >> 24) & 0xFF)
#define colour_from_rgba( r, g, b, a) ((((colour)(r)) << 0) | \
(((colour)(g)) << 8) | \
(((colour)(b)) << 16) | \
(((colour)(a)) << 24))
#define colour_from_rgb( r, g, b ) colour_from_rgba( (r), (g), (b), 0xFF )
NSColor *cocoa_convert_colour( colour clr )
{
return [NSColor colorWithDeviceRed: (float)colour_red_component( clr ) / 0xFF
green: (float)colour_green_component( clr ) / 0xFF
blue: (float)colour_blue_component( clr ) / 0xFF
alpha: 1.0];
}
static void cocoa_plot_path_set_stroke_pattern(NSBezierPath *path,const plot_style_t *pstyle)
{
static const CGFloat dashed_pattern[2] = { 5.0, 2.0 };
static const CGFloat dotted_pattern[2] = { 2.0, 2.0 };
switch (pstyle->stroke_type) {
case PLOT_OP_TYPE_DASH:
[path setLineDash: dashed_pattern count: 2 phase: 0];
break;
case PLOT_OP_TYPE_DOT:
[path setLineDash: dotted_pattern count: 2 phase: 0];
break;
default:
// ignore
break;
}
[path setLineWidth: cocoa_px_to_pt( pstyle->stroke_width )];
}
static bool plot_line(int x0, int y0, int x1, int y1, const plot_style_t *pstyle)
{
if (pstyle->stroke_type == PLOT_OP_TYPE_NONE) return true;
[NSGraphicsContext saveGraphicsState];
[NSBezierPath clipRect: cocoa_plot_clip_rect];
NSBezierPath *path = [NSBezierPath bezierPath];
[path moveToPoint: cocoa_point( x0, y0 )];
[path lineToPoint: cocoa_point( x1, y1 )];
cocoa_plot_path_set_stroke_pattern( path, pstyle );
const bool horizontal = y0 == y1;
const bool vertical = x0 == x1;
cocoa_center_pixel( !horizontal, !vertical );
[cocoa_convert_colour( pstyle->stroke_colour ) set];
[path stroke];
[NSGraphicsContext restoreGraphicsState];
return true;
}
static bool plot_rectangle(int x0, int y0, int x1, int y1, const plot_style_t *pstyle)
{
NSRect rect = cocoa_rect( x0, y0, x1, y1 );
NSBezierPath *path = [NSBezierPath bezierPathWithRect: rect];
cocoa_plot_render_path( path, pstyle );
return true;
}
static bool plot_text(int x, int y, const char *text, size_t length,
const plot_font_style_t *fstyle)
{
[NSGraphicsContext saveGraphicsState];
[NSBezierPath clipRect: cocoa_plot_clip_rect];
cocoa_draw_string( cocoa_px_to_pt( x ), cocoa_px_to_pt( y ), text, length, fstyle );
[NSGraphicsContext restoreGraphicsState];
return true;
}
void cocoa_set_clip( NSRect rect )
{
cocoa_plot_clip_rect = rect;
}
static bool plot_clip(const struct rect *clip)
{
cocoa_plot_clip_rect = cocoa_rect( clip->x0, clip->y0, clip->x1, clip->y1 );
return true;
}
void cocoa_plot_render_path(NSBezierPath *path,const plot_style_t *pstyle)
{
[NSGraphicsContext saveGraphicsState];
[NSBezierPath clipRect: cocoa_plot_clip_rect];
if (pstyle->fill_type != PLOT_OP_TYPE_NONE) {
[cocoa_convert_colour( pstyle->fill_colour ) setFill];
[path fill];
}
if (pstyle->stroke_type != PLOT_OP_TYPE_NONE) {
cocoa_center_pixel( true, true );
cocoa_plot_path_set_stroke_pattern(path,pstyle);
[cocoa_convert_colour( pstyle->stroke_colour ) set];
[path stroke];
}
[NSGraphicsContext restoreGraphicsState];
}
static bool plot_arc(int x, int y, int radius, int angle1, int angle2, const plot_style_t *pstyle)
{
NSBezierPath *path = [NSBezierPath bezierPath];
[path appendBezierPathWithArcWithCenter: NSMakePoint( x, y ) radius: radius
startAngle: angle1 endAngle: angle2
clockwise: NO];
cocoa_plot_render_path( path, pstyle);
return true;
}
static bool plot_disc(int x, int y, int radius, const plot_style_t *pstyle)
{
NSBezierPath *path = [NSBezierPath bezierPathWithOvalInRect:
NSMakeRect( x - radius, y-radius, 2*radius, 2*radius )];
cocoa_plot_render_path( path, pstyle );
return true;
}
static bool plot_polygon(const int *p, unsigned int n, const plot_style_t *pstyle)
{
if (n <= 1) return true;
NSBezierPath *path = [NSBezierPath bezierPath];
[path moveToPoint: cocoa_point( p[0], p[1] )];
for (unsigned i = 1; i < n; i++) {
[path lineToPoint: cocoa_point( p[2*i], p[2*i+1] )];
}
[path closePath];
cocoa_plot_render_path( path, pstyle );
return true;
}
/* complex path (for SVG) */
static bool plot_path(const float *p, unsigned int n, colour fill, float width,
colour c, const float transform[6])
{
if (n == 0) return true;
if (*p != PLOTTER_PATH_MOVE) {
LOG(("Path does not start with move"));
return false;
}
NSBezierPath *path = [NSBezierPath bezierPath];
#define NEXT_POINT() NSMakePoint( *p++, *p++ )
while (n--) {
switch ((int)*p++) {
case PLOTTER_PATH_MOVE: {
const NSPoint pt = NEXT_POINT();
[path moveToPoint: pt];
break;
}
case PLOTTER_PATH_LINE: {
const NSPoint pt = NEXT_POINT();
[path lineToPoint: pt];
break;
}
case PLOTTER_PATH_BEZIER: {
const NSPoint cp1 = NEXT_POINT();
const NSPoint cp2 = NEXT_POINT();
const NSPoint ep = NEXT_POINT();
[path curveToPoint: ep controlPoint1: cp1 controlPoint2: cp2];
break;
}
case PLOTTER_PATH_CLOSE:
[path closePath];
break;
default:
LOG(("Invalid path"));
return false;
}
}
#undef NEXT_POINT
[path setLineWidth: width];
CGContextRef context = [[NSGraphicsContext currentContext] graphicsPort];
CGContextSaveGState( context );
CGContextClipToRect( context, NSRectToCGRect( cocoa_plot_clip_rect ) );
CGContextConcatCTM( context, CGAffineTransformMake( transform[0], transform[1], transform[2],
transform[3], transform[4], transform[5] ) );
if (fill != NS_TRANSPARENT) {
[cocoa_convert_colour( fill ) setFill];
[path fill];
}
if (c != NS_TRANSPARENT) {
cocoa_center_pixel( true, true );
[cocoa_convert_colour( c ) set];
[path stroke];
}
CGContextRestoreGState( context );
return true;
}
/* Image */
static bool plot_bitmap(int x, int y, int width, int height,
struct bitmap *bitmap, colour bg,
bitmap_flags_t flags)
{
CGContextRef context = [[NSGraphicsContext currentContext] graphicsPort];
CGContextSaveGState( context );
CGContextClipToRect( context, NSRectToCGRect( cocoa_plot_clip_rect ) );
const bool tileX = flags & BITMAPF_REPEAT_X;
const bool tileY = flags & BITMAPF_REPEAT_Y;
CGImageRef img = cocoa_get_cgimage( bitmap );
CGRect rect = NSRectToCGRect( cocoa_rect_wh( x, y, width, height ) );
if (tileX || tileY) {
CGContextDrawTiledImage( context, rect, img );
} else {
CGContextDrawImage( context, rect, img );
}
CGContextRestoreGState( context );
return true;
}
struct plotter_table plot = {
.clip = plot_clip,
.arc = plot_arc,
.disc = plot_disc,
.rectangle = plot_rectangle,
.line = plot_line,
.polygon = plot_polygon,
.path = plot_path,
.bitmap = plot_bitmap,
.text = plot_text,
.option_knockout = true
};
CGFloat cocoa_scale_factor;
static const CGFloat points_per_inch = 72.0;
static CGFloat cocoa_half_pixel;
void cocoa_update_scale_factor( void )
{
const CGFloat scale = [[NSScreen mainScreen] userSpaceScaleFactor];
cocoa_scale_factor = scale == 1.0 ? 1.0 : 1.0 / scale;
cocoa_half_pixel = 0.5 * cocoa_scale_factor;
nscss_screen_dpi = FLTTOFIX( points_per_inch * scale );
}
static inline void cocoa_center_pixel( bool x, bool y )
{
NSAffineTransform *transform = [NSAffineTransform transform];
[transform translateXBy: x ? cocoa_half_pixel : 0.0 yBy: y ? cocoa_half_pixel : 0.0];
[transform concat];
}