| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "../SDL_internal.h" |
| |
| #include "SDL.h" |
| #include "SDL_assert.h" |
| #include "SDL_video.h" |
| #include "SDL_sysvideo.h" |
| #include "SDL_pixels.h" |
| #include "SDL_surface.h" |
| #include "SDL_shape.h" |
| #include "SDL_shape_internals.h" |
| |
| SDL_Window* |
| SDL_CreateShapedWindow(const char *title,unsigned int x,unsigned int y,unsigned int w,unsigned int h,Uint32 flags) |
| { |
| SDL_Window *result = NULL; |
| result = SDL_CreateWindow(title,-1000,-1000,w,h,(flags | SDL_WINDOW_BORDERLESS) & (~SDL_WINDOW_FULLSCREEN) & (~SDL_WINDOW_RESIZABLE) /* & (~SDL_WINDOW_SHOWN) */); |
| if(result != NULL) { |
| result->shaper = SDL_GetVideoDevice()->shape_driver.CreateShaper(result); |
| if(result->shaper != NULL) { |
| result->shaper->userx = x; |
| result->shaper->usery = y; |
| 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 ppb pixels-per-byte. */ |
| void |
| SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode,SDL_Surface *shape,Uint8* bitmap,Uint8 ppb) |
| { |
| int x = 0; |
| int y = 0; |
| Uint8 r = 0,g = 0,b = 0,alpha = 0; |
| Uint8* pixel = NULL; |
| Uint32 bitmap_pixel,pixel_value = 0,mask_value = 0; |
| SDL_Color key; |
| if(SDL_MUSTLOCK(shape)) |
| SDL_LockSurface(shape); |
| 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(3): |
| pixel_value = *(Uint32*)pixel & (~shape->format->Amask); |
| 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): |
| mask_value = (alpha >= 1 ? 1 : 0); |
| break; |
| case(ShapeModeBinarizeAlpha): |
| mask_value = (alpha >= mode.parameters.binarizationCutoff ? 1 : 0); |
| break; |
| case(ShapeModeReverseBinarizeAlpha): |
| mask_value = (alpha <= mode.parameters.binarizationCutoff ? 1 : 0); |
| break; |
| case(ShapeModeColorKey): |
| key = mode.parameters.colorKey; |
| mask_value = ((key.r != r || key.g != g || key.b != b) ? 1 : 0); |
| break; |
| } |
| bitmap[bitmap_pixel / ppb] |= mask_value << (7 - ((ppb - 1) - (bitmap_pixel % ppb))); |
| } |
| } |
| if(SDL_MUSTLOCK(shape)) |
| SDL_UnlockSurface(shape); |
| } |
| |
| static SDL_ShapeTree* |
| RecursivelyCalculateShapeTree(SDL_WindowShapeMode mode,SDL_Surface* mask,SDL_Rect dimensions) { |
| int x = 0,y = 0; |
| Uint8* pixel = NULL; |
| Uint32 pixel_value = 0; |
| Uint8 r = 0,g = 0,b = 0,a = 0; |
| SDL_bool pixel_opaque = SDL_FALSE; |
| int last_opaque = -1; |
| SDL_Color key; |
| SDL_ShapeTree* result = (SDL_ShapeTree*)SDL_malloc(sizeof(SDL_ShapeTree)); |
| SDL_Rect next = {0,0,0,0}; |
| for(y=dimensions.y;y<dimensions.y + dimensions.h;y++) { |
| for(x=dimensions.x;x<dimensions.x + dimensions.w;x++) { |
| pixel_value = 0; |
| pixel = (Uint8 *)(mask->pixels) + (y*mask->pitch) + (x*mask->format->BytesPerPixel); |
| switch(mask->format->BytesPerPixel) { |
| case(1): |
| pixel_value = *(Uint8*)pixel; |
| break; |
| case(2): |
| pixel_value = *(Uint16*)pixel; |
| break; |
| case(3): |
| pixel_value = *(Uint32*)pixel & (~mask->format->Amask); |
| break; |
| case(4): |
| pixel_value = *(Uint32*)pixel; |
| break; |
| } |
| SDL_GetRGBA(pixel_value,mask->format,&r,&g,&b,&a); |
| switch(mode.mode) { |
| case(ShapeModeDefault): |
| pixel_opaque = (a >= 1 ? SDL_TRUE : SDL_FALSE); |
| break; |
| case(ShapeModeBinarizeAlpha): |
| pixel_opaque = (a >= mode.parameters.binarizationCutoff ? SDL_TRUE : SDL_FALSE); |
| break; |
| case(ShapeModeReverseBinarizeAlpha): |
| pixel_opaque = (a <= mode.parameters.binarizationCutoff ? SDL_TRUE : SDL_FALSE); |
| break; |
| case(ShapeModeColorKey): |
| key = mode.parameters.colorKey; |
| pixel_opaque = ((key.r != r || key.g != g || key.b != b) ? SDL_TRUE : SDL_FALSE); |
| break; |
| } |
| if(last_opaque == -1) |
| last_opaque = pixel_opaque; |
| if(last_opaque != pixel_opaque) { |
| result->kind = QuadShape; |
| /* These will stay the same. */ |
| next.w = dimensions.w / 2; |
| next.h = dimensions.h / 2; |
| /* These will change from recursion to recursion. */ |
| next.x = dimensions.x; |
| next.y = dimensions.y; |
| result->data.children.upleft = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,next); |
| next.x += next.w; |
| /* Unneeded: next.y = dimensions.y; */ |
| result->data.children.upright = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,next); |
| next.x = dimensions.x; |
| next.y += next.h; |
| result->data.children.downleft = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,next); |
| next.x += next.w; |
| /* Unneeded: next.y = dimensions.y + dimensions.h /2; */ |
| result->data.children.downright = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,next); |
| return result; |
| } |
| } |
| } |
| /* If we never recursed, all the pixels in this quadrant have the same "value". */ |
| result->kind = (last_opaque == SDL_TRUE ? OpaqueShape : TransparentShape); |
| result->data.shape = dimensions; |
| return result; |
| } |
| |
| SDL_ShapeTree* |
| SDL_CalculateShapeTree(SDL_WindowShapeMode mode,SDL_Surface* shape) |
| { |
| SDL_Rect dimensions = {0,0,shape->w,shape->h}; |
| SDL_ShapeTree* result = NULL; |
| if(SDL_MUSTLOCK(shape)) |
| SDL_LockSurface(shape); |
| result = RecursivelyCalculateShapeTree(mode,shape,dimensions); |
| if(SDL_MUSTLOCK(shape)) |
| SDL_UnlockSurface(shape); |
| return result; |
| } |
| |
| void |
| SDL_TraverseShapeTree(SDL_ShapeTree *tree,SDL_TraversalFunction function,void* closure) |
| { |
| SDL_assert(tree != NULL); |
| if(tree->kind == QuadShape) { |
| SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.upleft,function,closure); |
| SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.upright,function,closure); |
| SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.downleft,function,closure); |
| SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.downright,function,closure); |
| } |
| else |
| function(tree,closure); |
| } |
| |
| void |
| SDL_FreeShapeTree(SDL_ShapeTree** shape_tree) |
| { |
| if((*shape_tree)->kind == QuadShape) { |
| SDL_FreeShapeTree((SDL_ShapeTree **)&(*shape_tree)->data.children.upleft); |
| SDL_FreeShapeTree((SDL_ShapeTree **)&(*shape_tree)->data.children.upright); |
| SDL_FreeShapeTree((SDL_ShapeTree **)&(*shape_tree)->data.children.downleft); |
| SDL_FreeShapeTree((SDL_ShapeTree **)&(*shape_tree)->data.children.downright); |
| } |
| SDL_free(*shape_tree); |
| *shape_tree = NULL; |
| } |
| |
| int |
| SDL_SetWindowShape(SDL_Window *window,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) |
| { |
| 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(shape_mode != NULL) |
| window->shaper->mode = *shape_mode; |
| result = SDL_GetVideoDevice()->shape_driver.SetWindowShape(window->shaper,shape,shape_mode); |
| window->shaper->hasshape = SDL_TRUE; |
| if(window->shaper->userx != 0 && window->shaper->usery != 0) { |
| SDL_SetWindowPosition(window,window->shaper->userx,window->shaper->usery); |
| window->shaper->userx = 0; |
| window->shaper->usery = 0; |
| } |
| return result; |
| } |
| |
| static 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 *shape_mode) |
| { |
| if(window != NULL && SDL_IsShapedWindow(window)) { |
| if(shape_mode == 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 { |
| *shape_mode = window->shaper->mode; |
| return 0; |
| } |
| } |
| else |
| /* The window given is not a valid shapeable window. */ |
| return SDL_NONSHAPEABLE_WINDOW; |
| } |
