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SDL_shape.c
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SDL_shape.c
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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
*/
#include "SDL_config.h"
#include "SDL.h"
#include "SDL_video.h"
#include "SDL_sysvideo.h"
#include "SDL_pixels.h"
#include "SDL_surface.h"
#include "SDL_shape.h"
extern SDL_VideoDisplay* SDL_ThisDisplay();
SDL_Window* SDL_CreateShapedWindow(const char *title,unsigned int x,unsigned int y,unsigned int w,unsigned int h,Uint32 flags) {
SDL_VideoDisplay* display = SDL_ThisDisplay();
SDL_Window *result = display->device->shape_driver.CreateShapedWindow(title,x,y,w,h,SDL_WINDOW_BORDERLESS | flags & !SDL_WINDOW_FULLSCREEN & !SDL_WINDOW_SHOWN);
if(result != NULL) {
result->shaper = result->display->device->shape_driver.CreateShaper(result);
if(result->shaper != NULL) {
result->shaper->usershownflag = flags & SDL_WINDOW_SHOWN;
result->shaper->mode.mode = ShapeModeDefault;
result->shaper->mode.parameters.binarizationCutoff = 1;
result->shaper->hasshape = SDL_FALSE;
return result;
}
else {
SDL_DestroyWindow(result);
return NULL;
}
}
else
return NULL;
}
SDL_bool SDL_IsShapedWindow(const SDL_Window *window) {
if(window == NULL)
return SDL_FALSE;
else
return (SDL_bool)(window->shaper != NULL);
}
/* REQUIRES that bitmap point to a w-by-h bitmap with 1bpp. */
void SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode,SDL_Surface *shape,Uint8* bitmap,Uint8 ppb,Uint8 value) {
int x = 0;
int y = 0;
Uint8 r = 0,g = 0,b = 0,alpha = 0;
Uint8* pixel = NULL;
Uint32 bitmap_pixel,pixel_value = 0;
SDL_Color key;
if(SDL_MUSTLOCK(shape))
SDL_LockSurface(shape);
pixel = (Uint8*)shape->pixels;
for(y = 0;y<shape->h;y++) {
for(x=0;x<shape->w;x++) {
alpha = 0;
pixel_value = 0;
pixel = (Uint8 *)(shape->pixels) + (y*shape->pitch) + (x*shape->format->BytesPerPixel);
switch(shape->format->BytesPerPixel) {
case(1):
pixel_value = *(Uint8*)pixel;
break;
case(2):
pixel_value = *(Uint16*)pixel;
break;
case(4):
pixel_value = *(Uint32*)pixel;
break;
}
SDL_GetRGBA(pixel_value,shape->format,&r,&g,&b,&alpha);
bitmap_pixel = y*shape->w + x;
switch(mode.mode) {
case(ShapeModeDefault):
bitmap[bitmap_pixel / ppb] |= (alpha >= 1 ? value : 0) << ((ppb - 1) - (bitmap_pixel % ppb));
break;
case(ShapeModeBinarizeAlpha):
bitmap[bitmap_pixel / ppb] |= (alpha >= mode.parameters.binarizationCutoff ? value : 0) << ((ppb - 1) - (bitmap_pixel % ppb));
break;
case(ShapeModeReverseBinarizeAlpha):
bitmap[bitmap_pixel / ppb] |= (alpha <= mode.parameters.binarizationCutoff ? value : 0) << ((ppb - 1) - (bitmap_pixel % ppb));
break;
case(ShapeModeColorKey):
key = mode.parameters.colorKey;
bitmap[bitmap_pixel / ppb] |= ((key.r == r && key.g == g && key.b == b) ? value : 0) << ((ppb - 1) - (bitmap_pixel % ppb));
break;
}
}
}
if(SDL_MUSTLOCK(shape))
SDL_UnlockSurface(shape);
}
int SDL_SetWindowShape(SDL_Window *window,SDL_Surface *shape,SDL_WindowShapeMode *shapeMode) {
int result;
if(window == NULL || !SDL_IsShapedWindow(window))
//The window given was not a shapeable window.
return SDL_NONSHAPEABLE_WINDOW;
if(shape == NULL)
//Invalid shape argument.
return SDL_INVALID_SHAPE_ARGUMENT;
if(shapeMode != NULL)
window->shaper->mode = *shapeMode;
//TODO: Platform-specific implementations of SetWindowShape. X11 is finished. Win32 is finished. Debugging is in progress on both.
result = window->display->device->shape_driver.SetWindowShape(window->shaper,shape,shapeMode);
window->shaper->hasshape = SDL_TRUE;
if((window->shaper->usershownflag & SDL_WINDOW_SHOWN) == SDL_WINDOW_SHOWN) {
SDL_ShowWindow(window);
window->shaper->usershownflag &= !SDL_WINDOW_SHOWN;
}
return result;
}
SDL_bool SDL_WindowHasAShape(SDL_Window *window) {
if (window == NULL && !SDL_IsShapedWindow(window))
return SDL_FALSE;
return window->shaper->hasshape;
}
int SDL_GetShapedWindowMode(SDL_Window *window,SDL_WindowShapeMode *shapeMode) {
if(window != NULL && SDL_IsShapedWindow(window)) {
if(shapeMode == NULL) {
if(SDL_WindowHasAShape(window))
//The window given has a shape.
return 0;
else
//The window given is shapeable but lacks a shape.
return SDL_WINDOW_LACKS_SHAPE;
}
else {
*shapeMode = window->shaper->mode;
return 0;
}
}
else
//The window given is not a valid shapeable window.
return SDL_NONSHAPEABLE_WINDOW;
}