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SDL_win32shape.c
145 lines (123 loc) · 5.04 KB
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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 <stdio.h>
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#include "SDL_win32shape.h"
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#include "SDL_win32video.h"
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SDL_WindowShaper*
Win32_CreateShaper(SDL_Window * window) {
int resized_properly;
SDL_WindowShaper* result = (SDL_WindowShaper *)SDL_malloc(sizeof(SDL_WindowShaper));
result->window = window;
result->mode.mode = ShapeModeDefault;
result->mode.parameters.binarizationCutoff = 1;
result->usershownflag = 0;
result->driverdata = (SDL_ShapeData*)SDL_malloc(sizeof(SDL_ShapeData));
((SDL_ShapeData*)result->driverdata)->mask_tree = NULL;
//Put some driver-data here.
window->shaper = result;
resized_properly = Win32_ResizeWindowShape(window);
if (resized_properly != 0)
return NULL;
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return result;
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}
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typedef struct {
POINT corners[4];
void* next;
} SDL_ShapeRect;
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void
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CombineRectRegions(SDL_ShapeTree* node,void* closure) {
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char debug_str[200];
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SDL_ShapeRect* rect_list = *((SDL_ShapeRect**)closure);
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if(node->kind == OpaqueShape) {
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SDL_ShapeRect* rect = SDL_malloc(sizeof(SDL_ShapeRect));
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sprintf_s(&debug_str[0],200,"x: %u y: %u, x+w: %u, y+h: %u\n",
node->data.shape.x,node->data.shape.y,
node->data.shape.x + node->data.shape.w,node->data.shape.y + node->data.shape.h);
OutputDebugStringA(debug_str);
OutputDebugStringA("Converting SDL_ShapeTree opaque node to Windows rectangle.\n");
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rect->corners[0].x = node->data.shape.x; rect->corners[0].y = node->data.shape.y;
rect->corners[1].x = node->data.shape.x + node->data.shape.w; rect->corners[1].y = node->data.shape.y;
rect->corners[2].x = node->data.shape.x + node->data.shape.w; rect->corners[2].y = node->data.shape.y + node->data.shape.h;
rect->corners[3].x = node->data.shape.x; rect->corners[3].y = node->data.shape.y + node->data.shape.h;
rect->next = *((SDL_ShapeRect**)closure);
*((SDL_ShapeRect**)closure) = rect;
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}
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}
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Uint32 num_shape_rects(SDL_ShapeRect* rect) {
if(rect == NULL)
return 0;
else
return 1 + num_shape_rects(rect->next);
}
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int
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Win32_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
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SDL_ShapeData *data;
HRGN mask_region;
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SDL_ShapeRect* rects = NULL,*old = NULL;
Uint16 num_rects = 0,i = 0;
int* polygonVertexNumbers = NULL;
POINT* polygons = NULL;
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char debug_str[200];
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if (shaper == NULL || shape == NULL)
return SDL_INVALID_SHAPE_ARGUMENT;
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if(shape->format->Amask == 0 && shape_mode->mode != ShapeModeColorKey || shape->w != shaper->window->w || shape->h != shaper->window->h)
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return SDL_INVALID_SHAPE_ARGUMENT;
data = (SDL_ShapeData*)shaper->driverdata;
if(data->mask_tree != NULL)
SDL_FreeShapeTree(&data->mask_tree);
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data->mask_tree = SDL_CalculateShapeTree(*shape_mode,shape);
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SDL_TraverseShapeTree(data->mask_tree,&CombineRectRegions,&rects);
num_rects = num_shape_rects(rects);
polygonVertexNumbers = (int*)SDL_malloc(sizeof(int)*num_rects);
for(i=0;i<num_rects;i++)
polygonVertexNumbers[i] = 4;
polygons = (POINT*)SDL_malloc(sizeof(POINT)*4*num_rects);
for(i=0;i<num_rects*4;i++) {
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polygons[i] = rects->corners[i % 4];
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if(i % 4 == 3) {
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sprintf_s(&debug_str[0],200,"x: %u y: %u, x+w: %u, y+h: %u\n",
rects->corners[0].x,rects->corners[0].y,
rects->corners[2].x,rects->corners[2].y);
OutputDebugStringA(debug_str);
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old = rects;
rects = rects->next;
SDL_free(old);
}
}
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/*
* Set the new region mask for the window
*/
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mask_region = CreatePolyPolygonRgn(polygons,polygonVertexNumbers,num_rects,WINDING);
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SetWindowRgn(((SDL_WindowData *)(shaper->window->driverdata))->hwnd, mask_region, TRUE);
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SDL_free(polygons);
SDL_free(polygonVertexNumbers);
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return 0;
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}
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int
Win32_ResizeWindowShape(SDL_Window *window) {
SDL_ShapeData* data;
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if (window == NULL)
return -1;
data = (SDL_ShapeData *)window->shaper->driverdata;
if (data == NULL)
return -1;
if(data->mask_tree != NULL)
SDL_FreeShapeTree(&data->mask_tree);
window->shaper->usershownflag |= window->flags & SDL_WINDOW_SHOWN;
return 0;
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}