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+/*
+ Copyright 2019-2020 David Robillard <d@drobilla.net>
+
+ Permission to use, copy, modify, and/or distribute this software for any
+ purpose with or without fee is hereby granted, provided that the above
+ copyright notice and this permission notice appear in all copies.
+
+ THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/**
+ @file mac_cairo.m
+ @brief Cairo graphics backend for MacOS.
+*/
+
+#include "pugl/detail/implementation.h"
+#include "pugl/detail/mac.h"
+#include "pugl/detail/stub.h"
+#include "pugl/pugl_cairo.h"
+
+#include <cairo-quartz.h>
+
+#import <Cocoa/Cocoa.h>
+
+#include <assert.h>
+
+@interface PuglCairoView : NSView
+@end
+
+@implementation PuglCairoView
+{
+@public
+ PuglView* puglview;
+ cairo_surface_t* surface;
+ cairo_t* cr;
+}
+
+- (id) initWithFrame:(NSRect)frame
+{
+ self = [super initWithFrame:frame];
+
+ return self;
+}
+
+- (void) resizeWithOldSuperviewSize:(NSSize)oldSize
+{
+ PuglWrapperView* wrapper = (PuglWrapperView*)[self superview];
+
+ [super resizeWithOldSuperviewSize:oldSize];
+ [wrapper setReshaped];
+}
+
+- (void) drawRect:(NSRect)rect
+{
+ PuglWrapperView* wrapper = (PuglWrapperView*)[self superview];
+ [wrapper dispatchExpose:rect];
+}
+
+@end
+
+static PuglStatus
+puglMacCairoCreate(PuglView* view)
+{
+ PuglInternals* impl = view->impl;
+ PuglCairoView* drawView = [PuglCairoView alloc];
+
+ drawView->puglview = view;
+ [drawView initWithFrame:[impl->wrapperView bounds]];
+ if (view->hints[PUGL_RESIZABLE]) {
+ [drawView setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
+ } else {
+ [drawView setAutoresizingMask:NSViewNotSizable];
+ }
+
+ impl->drawView = drawView;
+ return PUGL_SUCCESS;
+}
+
+static PuglStatus
+puglMacCairoDestroy(PuglView* view)
+{
+ PuglCairoView* const drawView = (PuglCairoView*)view->impl->drawView;
+
+ [drawView removeFromSuperview];
+ [drawView release];
+
+ view->impl->drawView = nil;
+ return PUGL_SUCCESS;
+}
+
+static PuglStatus
+puglMacCairoEnter(PuglView* view, const PuglEventExpose* expose)
+{
+ PuglCairoView* const drawView = (PuglCairoView*)view->impl->drawView;
+ if (!expose) {
+ return PUGL_SUCCESS;
+ }
+
+ assert(!drawView->surface);
+ assert(!drawView->cr);
+
+ const double scale = 1.0 / [[NSScreen mainScreen] backingScaleFactor];
+ CGContextRef context = [[NSGraphicsContext currentContext] graphicsPort];
+ const CGSize sizePx = {view->frame.width, view->frame.height};
+ const CGSize sizePt = CGContextConvertSizeToUserSpace(context, sizePx);
+
+ // Convert coordinates to standard Cairo space
+ CGContextTranslateCTM(context, 0.0, -sizePt.height);
+ CGContextScaleCTM(context, scale, -scale);
+
+ drawView->surface = cairo_quartz_surface_create_for_cg_context(
+ context, (unsigned)sizePx.width, (unsigned)sizePx.height);
+
+ drawView->cr = cairo_create(drawView->surface);
+
+ return PUGL_SUCCESS;
+}
+
+static PuglStatus
+puglMacCairoLeave(PuglView* view, const PuglEventExpose* expose)
+{
+ PuglCairoView* const drawView = (PuglCairoView*)view->impl->drawView;
+ if (!expose) {
+ return PUGL_SUCCESS;
+ }
+
+ assert(drawView->surface);
+ assert(drawView->cr);
+
+ CGContextRef context = cairo_quartz_surface_get_cg_context(drawView->surface);
+
+ cairo_destroy(drawView->cr);
+ cairo_surface_destroy(drawView->surface);
+ drawView->cr = NULL;
+ drawView->surface = NULL;
+
+ CGContextFlush(context);
+
+ return PUGL_SUCCESS;
+}
+
+static void*
+puglMacCairoGetContext(PuglView* view)
+{
+ return ((PuglCairoView*)view->impl->drawView)->cr;
+}
+
+const PuglBackend* puglCairoBackend(void)
+{
+ static const PuglBackend backend = {puglStubConfigure,
+ puglMacCairoCreate,
+ puglMacCairoDestroy,
+ puglMacCairoEnter,
+ puglMacCairoLeave,
+ puglMacCairoGetContext};
+
+ return &backend;
+}