本文整理汇总了C++中SDL_VideoDevice::AllocHWSurface方法的典型用法代码示例。如果您正苦于以下问题：C++ SDL_VideoDevice::AllocHWSurface方法的具体用法？C++ SDL_VideoDevice::AllocHWSurface怎么用？C++ SDL_VideoDevice::AllocHWSurface使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类SDL_VideoDevice的用法示例。
在下文中一共展示了SDL_VideoDevice::AllocHWSurface方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: malloc
/*
* Create an empty RGB surface of the appropriate depth
*/
SDL_Surface * SDL_CreateRGBSurface (Uint32 flags,
int width, int height, int depth,
Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
{
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
SDL_Surface *screen;
SDL_Surface *surface;
/* Make sure the size requested doesn't overflow our datatypes */
/* Next time I write a library like SDL, I'll use int for size. :) */
if ( width > 16384 || height > 16384 ) {
SDL_SetError("Width or height is too large");
return(NULL);
}
/* Check to see if we desire the surface in video memory */
if ( video ) {
screen = SDL_PublicSurface;
} else {
screen = NULL;
}
if ( screen && ((screen->flags&SDL_HWSURFACE) == SDL_HWSURFACE) ) {
if ( (flags&(SDL_SRCCOLORKEY|SDL_SRCALPHA)) != 0 ) {
flags |= SDL_HWSURFACE;
}
if ( (flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
if ( ! current_video->info.blit_hw_CC ) {
flags &= ~SDL_HWSURFACE;
}
}
if ( (flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
if ( ! current_video->info.blit_hw_A ) {
flags &= ~SDL_HWSURFACE;
}
}
} else {
flags &= ~SDL_HWSURFACE;
}
/* Allocate the surface */
surface = (SDL_Surface *)malloc(sizeof(*surface));
if ( surface == NULL ) {
SDL_OutOfMemory();
return(NULL);
}
surface->flags = SDL_SWSURFACE;
if ( (flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
depth = screen->format->BitsPerPixel;
Rmask = screen->format->Rmask;
Gmask = screen->format->Gmask;
Bmask = screen->format->Bmask;
Amask = screen->format->Amask;
}
surface->format = SDL_AllocFormat(depth, Rmask, Gmask, Bmask, Amask);
if ( surface->format == NULL ) {
free(surface);
return(NULL);
}
if ( Amask ) {
surface->flags |= SDL_SRCALPHA;
}
surface->w = width;
surface->h = height;
surface->pitch = SDL_CalculatePitch(surface);
surface->pixels = NULL;
surface->offset = 0;
surface->hwdata = NULL;
surface->locked = 0;
surface->map = NULL;
surface->unused1 = 0;
SDL_SetClipRect(surface, NULL);
SDL_FormatChanged(surface);
/* Get the pixels */
if ( ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) ||
(video->AllocHWSurface(this, surface) < 0) ) {
if ( surface->w && surface->h ) {
surface->pixels = malloc(surface->h*surface->pitch);
if ( surface->pixels == NULL ) {
SDL_FreeSurface(surface);
SDL_OutOfMemory();
return(NULL);
}
/* This is important for bitmaps */
memset(surface->pixels, 0, surface->h*surface->pitch);
}
}
/* Allocate an empty mapping */
surface->map = SDL_AllocBlitMap();
if ( surface->map == NULL ) {
SDL_FreeSurface(surface);
return(NULL);
}
/* The surface is ready to go */
//.........这里部分代码省略.........