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Diffstat (limited to 'frontends/cocoa/plotter.m')
-rw-r--r-- | frontends/cocoa/plotter.m | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/frontends/cocoa/plotter.m b/frontends/cocoa/plotter.m new file mode 100644 index 000000000..72577da1a --- /dev/null +++ b/frontends/cocoa/plotter.m @@ -0,0 +1,337 @@ +/* + * 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 "utils/log.h" +#import "utils/utils.h" +#import "netsurf/browser_window.h" +#import "netsurf/plotters.h" + +#import "cocoa/font.h" +#import "cocoa/coordinates.h" +#import "cocoa/plotter.h" +#import "cocoa/bitmap.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 > 0 ? pstyle->stroke_width : 1)]; +} + +static nserror plot_line(const struct redraw_context *ctx, const plot_style_t *pstyle, const struct rect *line) +{ + if (pstyle->stroke_type == PLOT_OP_TYPE_NONE) + return NSERROR_OK; + + [NSGraphicsContext saveGraphicsState]; + [NSBezierPath clipRect:cocoa_plot_clip_rect]; + + NSBezierPath *path = [NSBezierPath bezierPath]; + [path moveToPoint:cocoa_point(line->x0, line->y0)]; + [path lineToPoint:cocoa_point(line->x1, line->y1)]; + cocoa_plot_path_set_stroke_pattern(path, pstyle); + + const bool horizontal = line->y0 == line->y1; + const bool vertical = line->x0 == line->x1; + const bool oddThickness = pstyle->stroke_width != 0 ? (pstyle->stroke_width % 2) != 0 : true; + + if (oddThickness) + cocoa_center_pixel(!horizontal, !vertical); + + [cocoa_convert_colour(pstyle->stroke_colour) set]; + [path stroke]; + + [NSGraphicsContext restoreGraphicsState]; + + return NSERROR_OK; +} + +static nserror plot_rectangle(const struct redraw_context *ctx, const plot_style_t *pstyle, const struct rect *r) +{ + NSRect rect = cocoa_rect(r->x0, r->y0, r->x1, r->y1); + NSBezierPath *path = [NSBezierPath bezierPathWithRect:rect]; + cocoa_plot_render_path(path, pstyle); + + return NSERROR_OK; +} + +static nserror plot_text(const struct redraw_context *ctx, const plot_font_style_t *fstyle, int x, int y, const char *text, size_t length) +{ + [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 NSERROR_OK; +} + +void cocoa_set_clip(NSRect rect) +{ + cocoa_plot_clip_rect = rect; +} + +static nserror plot_clip(const struct redraw_context *ctx, const struct rect *clip) +{ + cocoa_plot_clip_rect = cocoa_rect(clip->x0, clip->y0, clip->x1, clip->y1); + return NSERROR_OK; +} + +void cocoa_plot_render_path(NSBezierPath *path, const plot_style_t *pstyle) +{ + // Quick exit if the clip rect has a zero size. Core Graphics doesn’t like that. + if (cocoa_plot_clip_rect.size.width == 0 || cocoa_plot_clip_rect.size.height == 0) { + return; + } + + [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) { + if (pstyle->stroke_width == 0 || pstyle->stroke_width % 2 != 0) + 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 nserror plot_arc(const struct redraw_context *ctx, const plot_style_t *pstyle, int x, int y, int radius, int angle1, int angle2) +{ + NSBezierPath *path = [NSBezierPath bezierPath]; + [path appendBezierPathWithArcWithCenter:NSMakePoint(x, y) + radius:radius + startAngle:angle1 + endAngle:angle2 + clockwise:NO]; + + cocoa_plot_render_path(path, pstyle); + + return NSERROR_OK; +} + +static nserror plot_disc(const struct redraw_context *ctx, const plot_style_t *pstyle, int x, int y, int radius) +{ + NSBezierPath *path = [NSBezierPath bezierPathWithOvalInRect: + NSMakeRect(x - radius, y - radius, 2 * radius, 2 * radius)]; + + cocoa_plot_render_path(path, pstyle); + + return NSERROR_OK; +} + +static nserror plot_polygon(const struct redraw_context *ctx, const plot_style_t *pstyle, const int *p, unsigned int n) +{ + if (n <= 1) + return NSERROR_OK; + + 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 NSERROR_OK; +} + +/* complex path (for SVG) */ +static nserror plot_path(const struct redraw_context *ctx, const plot_style_t *pstyle, const float *p, unsigned int n, float width, const float transform[6]) +{ + if (n == 0) + return NSERROR_OK; + + if (*p != PLOTTER_PATH_MOVE) { + NSLOG(netsurf, INFO, "Path does not start with move"); + return NSERROR_INVALID; + } + + NSBezierPath *path = [NSBezierPath bezierPath]; + +#define NEXT_POINT() ({ const float *c = p; p += 2; NSMakePoint( c[0], c[1] ); }) + + 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: + NSLOG(netsurf, INFO, "Invalid path"); + return NSERROR_INVALID; + } + } + +#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 (pstyle->fill_colour != NS_TRANSPARENT) { + [cocoa_convert_colour(pstyle->fill_colour) setFill]; + [path fill]; + } + + if (pstyle->stroke_colour != NS_TRANSPARENT) { + cocoa_center_pixel(true, true); + [cocoa_convert_colour(pstyle->stroke_colour) set]; + [path stroke]; + } + + CGContextRestoreGState(context); + + return true; +} + +/* Image */ +static nserror plot_bitmap(const struct redraw_context *ctx, struct bitmap *bitmap, int x, int y, int width, int height, 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 NSERROR_OK; +} + +const struct plotter_table cocoa_plotters = { + .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) +{ + cocoa_scale_factor = 1.0; + cocoa_half_pixel = 0.5 * cocoa_scale_factor; + browser_set_dpi(points_per_inch); +} + +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]; +} |