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/* GdkMacosCairoSubview.c
*
* Copyright © 2020 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "config.h"
#include <CoreGraphics/CoreGraphics.h>
#include <cairo-quartz.h>
#include "gdkinternals.h"
#import "GdkMacosCairoSubview.h"
#import "GdkMacosCairoView.h"
#include "gdkmacossurface-private.h"
@implementation GdkMacosCairoSubview
-(void)dealloc
{
g_clear_pointer (&self->clip, cairo_region_destroy);
[super dealloc];
}
-(BOOL)isOpaque
{
return _isOpaque;
}
-(BOOL)isFlipped
{
return YES;
}
-(GdkSurface *)gdkSurface
{
return GDK_SURFACE ([(GdkMacosBaseView *)[self superview] gdkSurface]);
}
-(void)drawRect:(NSRect)rect
{
CGContextRef cgContext;
GdkSurface *gdk_surface;
cairo_surface_t *dest;
const NSRect *rects = NULL;
NSView *root_view;
NSInteger n_rects = 0;
NSRect abs_bounds;
cairo_t *cr;
CGSize scale;
int scale_factor;
if (self->cairoSurface == NULL)
return;
/* Acquire everything we need to do translations, drawing, etc */
gdk_surface = [self gdkSurface];
scale_factor = gdk_surface_get_scale_factor (gdk_surface);
root_view = [[self window] contentView];
cgContext = [[NSGraphicsContext currentContext] CGContext];
abs_bounds = [self convertRect:[self bounds] toView:root_view];
CGContextSaveGState (cgContext);
/* Translate scaling to remove HiDPI scaling from CGContext as
* cairo will be doing that for us already.
*/
scale = CGSizeMake (1.0, 1.0);
scale = CGContextConvertSizeToDeviceSpace (cgContext, scale);
CGContextScaleCTM (cgContext, 1.0 / scale.width, 1.0 / scale.height);
/* Create the cairo surface to draw to the CGContext and translate
* coordinates so we can pretend we are in the same coordinate system
* as the GDK surface.
*/
dest = cairo_quartz_surface_create_for_cg_context (cgContext,
gdk_surface->width * scale_factor,
gdk_surface->height * scale_factor);
cairo_surface_set_device_scale (dest, scale_factor, scale_factor);
/* Create cairo context and translate things into the origin of
* the topmost contentView so that we just draw at 0,0 with a
* clip region to paint the surface.
*/
cr = cairo_create (dest);
cairo_translate (cr, -abs_bounds.origin.x, -abs_bounds.origin.y);
/* Apply the clip if provided one */
if (self->clip != NULL)
{
cairo_rectangle_int_t area;
n_rects = cairo_region_num_rectangles (self->clip);
for (guint i = 0; i < n_rects; i++)
{
cairo_region_get_rectangle (self->clip, i, &area);
cairo_rectangle (cr, area.x, area.y, area.width, area.height);
}
cairo_clip (cr);
}
/* Clip the cairo context based on the rectangles to be drawn
* within the bounding box :rect.
*/
[self getRectsBeingDrawn:&rects count:&n_rects];
for (NSInteger i = 0; i < n_rects; i++)
{
NSRect area = [self convertRect:rects[i] toView:root_view];
cairo_rectangle (cr,
area.origin.x, area.origin.y,
area.size.width, area.size.height);
}
cairo_clip (cr);
/* Now paint the surface (without blending) as we do not need
* any compositing here. The transparent regions (like shadows)
* are already on non-opaque layers.
*/
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_surface (cr, self->cairoSurface, 0, 0);
cairo_paint (cr);
/* Cleanup state, flush the surface to the backing layer, and
* restore GState for future use.
*/
cairo_destroy (cr);
cairo_surface_flush (dest);
cairo_surface_destroy (dest);
CGContextRestoreGState (cgContext);
}
-(void)setCairoSurface:(cairo_surface_t *)surface
withDamage:(cairo_region_t *)region
{
if (surface != self->cairoSurface)
{
g_clear_pointer (&self->cairoSurface, cairo_surface_destroy);
if (surface != NULL)
self->cairoSurface = cairo_surface_reference (surface);
}
if (region != NULL)
{
NSView *root_view = [[self window] contentView];
NSRect abs_bounds = [self convertRect:[self bounds] toView:root_view];
guint n_rects = cairo_region_num_rectangles (region);
for (guint i = 0; i < n_rects; i++)
{
cairo_rectangle_int_t rect;
NSRect nsrect;
cairo_region_get_rectangle (region, i, &rect);
nsrect = NSMakeRect (rect.x, rect.y, rect.width, rect.height);
if (NSIntersectsRect (abs_bounds, nsrect))
{
nsrect.origin.x -= abs_bounds.origin.x;
nsrect.origin.y -= abs_bounds.origin.y;
[self setNeedsDisplayInRect:nsrect];
}
}
}
for (id view in [self subviews])
[(GdkMacosCairoSubview *)view setCairoSurface:surface
withDamage:region];
}
-(void)setOpaque:(BOOL)opaque
{
self->_isOpaque = opaque;
}
-(void)setClip:(cairo_region_t*)region
{
if (region != self->clip)
{
g_clear_pointer (&self->clip, cairo_region_destroy);
if (region != NULL)
self->clip = cairo_region_reference (region);
}
}
@end
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