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SDL_cocoashape.m
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 2010 Eli Gottlieb
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 2.1 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, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Eli Gottlieb
eligottlieb@gmail.com
*/
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#include "SDL_stdinc.h"
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#include "SDL_cocoavideo.h"
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#include "SDL_shape.h"
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#include "SDL_cocoashape.h"
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#include "../SDL_sysvideo.h"
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SDL_WindowShaper* Cocoa_CreateShaper(SDL_Window* window) {
SDL_WindowData* data = (SDL_WindowData*)window->driverdata;
[data->nswindow setAlpha:1.0];
[data->nswindow setOpaque:YES];
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[data->nswindow setStyleMask:NSBorderlessWindowMask];
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SDL_WindowShaper* result = SDL_malloc(sizeof(SDL_WindowShaper));
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result->window = window;
result->mode.mode = ShapeModeDefault;
result->mode.parameters.binarizationCutoff = 1;
result->usershownflag = 0;
window->shaper = result;
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SDL_ShapeData* shape_data = SDL_malloc(sizeof(SDL_ShapeData));
result->driverdata = shape_data;
shape_data->context = [data->nswindow graphicsContext];
shape_data->saved = SDL_FALSE;
shape_data->shape = NULL;
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int resized_properly = Cocoa_ResizeWindowShape(window);
assert(resized_properly == 0);
return result;
}
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typedef struct {
NSBezierPath* clipPath;
SDL_Window* window;
} SDL_PathConglomeration;
NSRect convert_rect(SDL_Rect rect,SDL_Window* window) {
NSRect nsrect = NSMakeRect(rect.x,window->h-(rect.y+rect.h),rect.w,rect.h);
return [[((SDL_WindowData*)window->driverdata)->nswindow contentView] convertRectFromBase:nsrect];
}
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void ConglomerateShapeTree(SDL_ShapeTree* tree,SDL_PathConglomeration* cong) {
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if(tree->kind == OpaqueShape) {
NSRect rect = convert_rect(tree->data.shape,cong->window);
[cong->clipPath appendBezierPathWithRect:rect];
}
}
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int Cocoa_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shapeMode) {
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SDL_ShapeData* data = (SDL_ShapeData*)shaper->driverdata;
if(data->saved == SDL_TRUE) {
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[data->context restoreGraphicsState];
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data->saved = SDL_FALSE;
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}
[data->context saveGraphicsState];
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data->saved = SDL_TRUE;
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//[[NSColor clearColor] set];
//NSRectFill([[((SDL_WindowData*)shaper->window->driverdata)->nswindow contentView] frame]);
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/* TODO: It looks like Cocoa can set a clipping path based on a list of rectangles. That's what we get from the
Windoze shape-calculation code: a list of rectangles. This will work... I think. */
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NSBezierPath* clipPath = [NSBezierPath bezierPath];
SDL_PathConglomeration cong = {clipPath,shaper->window};
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SDL_TraverseShapeTree(data->shape,(SDL_TraversalFunction)&ConglomerateShapeTree,(void*)&cong);
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[clipPath addClip];
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}
int Cocoa_ResizeWindowShape(SDL_Window *window) {
SDL_ShapeData* data = window->shaper->driverdata;
assert(data != NULL);
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if(data->shape != NULL)
SDL_FreeShapeTree(&data->shape);
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return 0;
}