mirror of
https://github.com/TerryCavanagh/VVVVVV.git
synced 2024-06-24 13:38:29 +02:00
6b1a7ebce6
This makes the "[Press ENTER to return to editor]" fade out after a few frames, allowing screenshots of custom levels to be cleaner and to make sure nothing is obscured while the user is editing their level. This commit also adds alpha support in BlitSurfaceColoured, where it takes into account the alpha of the pixel *and* the alpha of the color. `graphics::getRGBA(r,g,b,a)` was added to help with this.
530 lines
13 KiB
C++
530 lines
13 KiB
C++
#include "Graphics.h"
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void setRect( SDL_Rect& _r, int x, int y, int w, int h )
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{
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_r.x = x;
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_r.y = y;
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_r.w = w;
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_r.h = h;
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}
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unsigned int endian_swap( unsigned int x )
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{
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return (x>>24) |
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((x<<8) & 0x00FF0000) |
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((x>>8) & 0x0000FF00) |
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(x<<24);
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}
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template <class T>
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void endian_swap(T *objp)
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{
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unsigned char *memp = reinterpret_cast<unsigned char*>(objp);
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std::reverse(memp, memp + sizeof(T));
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}
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SDL_Surface* GetSubSurface( SDL_Surface* metaSurface, int x, int y, int width, int height )
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{
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// Create an SDL_Rect with the area of the _surface
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SDL_Rect area;
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area.x = x;
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area.y = y;
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area.w = width;
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area.h = height;
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// Set the RGBA mask values.
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Uint32 r, g, b, a;
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#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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r = 0xff000000;
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g = 0x00ff0000;
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b = 0x0000ff00;
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a = 0x000000ff;
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#else
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r = 0x000000ff;
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g = 0x0000ff00;
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b = 0x00ff0000;
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a = 0xff000000;
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#endif
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//Convert to the correct display format after nabbing the new _surface or we will slow things down.
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SDL_Surface* preSurface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32, r, g, b, a);
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//SDL_Surface* subSurface = SDL_DisplayFormatAlpha(preSurface);
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//SDL_FreeSurface(preSurface);
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// Lastly, apply the area from the meta _surface onto the whole of the sub _surface.
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SDL_BlitSurface(metaSurface, &area, preSurface, 0);
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// Return the new Bitmap _surface
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return preSurface;
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}
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void DrawPixel( SDL_Surface *_surface, int x, int y, Uint32 pixel )
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{
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int bpp = _surface->format->BytesPerPixel;
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/* Here p is the address to the pixel we want to set */
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Uint8 *p = (Uint8 *)_surface->pixels + y * _surface->pitch + x * bpp;
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switch(bpp)
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{
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case 1:
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*p = pixel;
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break;
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case 2:
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*(Uint16 *)p = pixel;
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break;
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case 3:
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if(SDL_BYTEORDER != SDL_BIG_ENDIAN)
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{
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p[0] = (pixel >> 16) & 0xff;
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p[1] = (pixel >> 8) & 0xff;
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p[2] = pixel & 0xff;
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}
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else
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{
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p[0] = pixel & 0xff;
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p[1] = (pixel >> 8) & 0xff;
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p[2] = (pixel >> 16) & 0xff;
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}
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break;
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case 4:
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*(Uint32 *)p = pixel;
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break;
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}
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}
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Uint32 ReadPixel( SDL_Surface *_surface, int x, int y )
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{
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int bpp = _surface->format->BytesPerPixel;
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/* Here p is the address to the pixel we want to retrieve */
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Uint8 *p = (Uint8 *)_surface->pixels + y * _surface->pitch + x * bpp;
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switch(bpp)
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{
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case 1:
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return *p;
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break;
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case 2:
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return *(Uint16 *)p;
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break;
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case 3:
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if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
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return p[0] << 16 | p[1] << 8 | p[2];
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else
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return p[0] | p[1] << 8 | p[2] << 16;
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break;
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case 4:
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return *(Uint32 *)p;
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break;
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default:
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return 0; /* shouldn't happen, but avoids warnings */
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}
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}
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SDL_Surface * ScaleSurface( SDL_Surface *_surface, int Width, int Height, SDL_Surface * Dest )
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{
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if(!_surface || !Width || !Height)
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return 0;
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SDL_Surface *_ret;
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if(Dest == NULL)
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{
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_ret = SDL_CreateRGBSurface(_surface->flags, Width, Height, _surface->format->BitsPerPixel,
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_surface->format->Rmask, _surface->format->Gmask, _surface->format->Bmask, _surface->format->Amask);
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if(_ret == NULL)
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{
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return NULL;
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}
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}
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else
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{
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_ret = Dest;
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}
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float _stretch_factor_x = (static_cast<double>(Width) / static_cast<double>(_surface->w)), _stretch_factor_y = (static_cast<double>(Height) / static_cast<double>(_surface->h));
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SDL_Rect gigantoPixel;
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for(Sint32 y = 0; y < _surface->h; y++)
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for(Sint32 x = 0; x < _surface->w; x++)
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{
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setRect(gigantoPixel, static_cast<Sint32>((float(x)*_stretch_factor_x) -1), static_cast<Sint32>((float(y) *_stretch_factor_y)-1), static_cast<Sint32>(_stretch_factor_x +1.0),static_cast<Sint32>( _stretch_factor_y+1.0)) ;
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SDL_FillRect(_ret, &gigantoPixel, ReadPixel(_surface, x, y));
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}
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// DrawPixel(_ret, static_cast<Sint32>(_stretch_factor_x * x) + o_x,
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//static_cast<Sint32>(_stretch_factor_y * y) + o_y, ReadPixel(_surface, x, y));
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return _ret;
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}
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SDL_Surface * ScaleSurfaceSlow( SDL_Surface *_surface, int Width, int Height)
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{
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if(!_surface || !Width || !Height)
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return 0;
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SDL_Surface *_ret;
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_ret = SDL_CreateRGBSurface(_surface->flags, Width, Height, _surface->format->BitsPerPixel,
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_surface->format->Rmask, _surface->format->Gmask, _surface->format->Bmask, _surface->format->Amask);
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if(_ret == NULL)
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{
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return NULL;
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}
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float _stretch_factor_x = (static_cast<double>(Width) / static_cast<double>(_surface->w)), _stretch_factor_y = (static_cast<double>(Height) / static_cast<double>(_surface->h));
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for(Sint32 y = 0; y < _surface->h; y++)
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for(Sint32 x = 0; x < _surface->w; x++)
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for(Sint32 o_y = 0; o_y < _stretch_factor_y; ++o_y)
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for(Sint32 o_x = 0; o_x < _stretch_factor_x; ++o_x)
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DrawPixel(_ret, static_cast<Sint32>(_stretch_factor_x * x) + o_x,
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static_cast<Sint32>(_stretch_factor_y * y) + o_y, ReadPixel(_surface, x, y));
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// DrawPixel(_ret, static_cast<Sint32>(_stretch_factor_x * x) + o_x,
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//static_cast<Sint32>(_stretch_factor_y * y) + o_y, ReadPixel(_surface, x, y));
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return _ret;
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}
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SDL_Surface * FlipSurfaceHorizontal(SDL_Surface* _src)
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{
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SDL_Surface * ret = SDL_CreateRGBSurface(_src->flags, _src->w, _src->h, _src->format->BitsPerPixel,
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_src->format->Rmask, _src->format->Gmask, _src->format->Bmask, _src->format->Amask);
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if(ret == NULL)
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{
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return NULL;
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}
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for(Sint32 y = 0; y < _src->h; y++)
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{
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for(Sint32 x = 0; x < _src->w; x++)
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{
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DrawPixel(ret,(_src->w -1) -x,y,ReadPixel(_src, x, y));
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}
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}
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return ret;
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}
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SDL_Surface * FlipSurfaceVerticle(SDL_Surface* _src)
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{
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SDL_Surface * ret = SDL_CreateRGBSurface(_src->flags, _src->w, _src->h, _src->format->BitsPerPixel,
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_src->format->Rmask, _src->format->Gmask, _src->format->Bmask, _src->format->Amask);
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if(ret == NULL)
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{
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return NULL;
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}
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for(Sint32 y = 0; y < _src->h; y++)
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{
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for(Sint32 x = 0; x < _src->w; x++)
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{
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DrawPixel(ret, x ,(_src->h-1) - y ,ReadPixel(_src, x, y));
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}
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}
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return ret;
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}
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void BlitSurfaceStandard( SDL_Surface* _src, SDL_Rect* _srcRect, SDL_Surface* _dest, SDL_Rect* _destRect )
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{
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//SDL_Rect tempRect = *_destRect;
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//tempRect.w ;
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//tempRect.h ;
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//tempRect.x *=globalScale;
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//tempRect.y *=globalScale;
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//if(globalScale != 1)
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//{
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// SDL_Surface* tempScaled = ScaleSurface(_src, tempRect.w, tempRect.h);
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// SDL_BlitSurface( tempScaled, _srcRect, _dest, &tempRect );
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// SDL_FreeSurface(tempScaled);
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//}
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//else
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//{
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SDL_BlitSurface( _src, _srcRect, _dest, _destRect );
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//}
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}
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void BlitSurfaceColoured(
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SDL_Surface* _src,
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SDL_Rect* _srcRect,
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SDL_Surface* _dest,
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SDL_Rect* _destRect,
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colourTransform& ct
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) {
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SDL_Rect *tempRect = _destRect;
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const SDL_PixelFormat& fmt = *(_src->format);
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// const SDL_PixelFormat& destfmt = *(_dest->format);
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SDL_Surface* tempsurface = SDL_CreateRGBSurface(
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SDL_SWSURFACE,
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_src->w,
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_src->h,
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fmt.BitsPerPixel,
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fmt.Rmask,
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fmt.Gmask,
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fmt.Bmask,
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fmt.Amask
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);
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for(int x = 0; x < tempsurface->w; x++)
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{
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for(int y = 0; y < tempsurface->h; y++)
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{
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Uint32 pixel = ReadPixel(_src, x, y);
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Uint32 Alpha = pixel & fmt.Amask;
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Uint32 result = ct.colour & 0x00FFFFFF;
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Uint32 CTAlpha = ct.colour & fmt.Amask;
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float div1 = ((Alpha >> 24) / 255.0f);
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float div2 = ((CTAlpha >> 24) / 255.0f);
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Uint32 UseAlpha = (div1 * div2) * 255.0f;
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DrawPixel(tempsurface, x, y, result | (UseAlpha << 24));
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}
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}
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SDL_BlitSurface(tempsurface, _srcRect, _dest, tempRect);
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SDL_FreeSurface(tempsurface);
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}
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int scrollamount = 0;
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bool isscrolling = 0;
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SDL_Surface* ApplyFilter( SDL_Surface* _src )
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{
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SDL_Surface* _ret = SDL_CreateRGBSurface(_src->flags, _src->w, _src->h, 32,
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_src->format->Rmask, _src->format->Gmask, _src->format->Bmask, _src->format->Amask);
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if (rand() % 4000 < 8)
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{
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isscrolling = true;
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}
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if(isscrolling == true)
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{
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scrollamount += 20;
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if(scrollamount > 240)
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{
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scrollamount = 0;
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isscrolling = false;
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}
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}
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int redOffset = rand() % 4;
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for(int x = 0; x < _src->w; x++)
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{
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for(int y = 0; y < _src->h; y++)
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{
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int sampley = (y + scrollamount )% 240;
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Uint32 pixel = ReadPixel(_src, x,sampley);
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Uint8 green = (pixel & _src->format->Gmask) >> 8;
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Uint8 blue = (pixel & _src->format->Bmask) >> 0;
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Uint32 pixelOffset = ReadPixel(_src, std::min(x+redOffset, 319), sampley) ;
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Uint8 red = (pixelOffset & _src->format->Rmask) >> 16 ;
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if(isscrolling && sampley > 220 && ((rand() %10) < 4))
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{
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red = std::min(int(red+(fRandom() * 0.6) * 254) , 255);
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green = std::min(int(green+(fRandom() * 0.6) * 254) , 255);
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blue = std::min(int(blue+(fRandom() * 0.6) * 254) , 255);
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}
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else
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{
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red = std::min(int(red+(fRandom() * 0.2) * 254) , 255);
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green = std::min(int(green+(fRandom() * 0.2) * 254) , 255);
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blue = std::min(int(blue+(fRandom() * 0.2) * 254) , 255);
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}
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if(y % 2 == 0)
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{
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red = static_cast<Uint8>(red / 1.2f);
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green = static_cast<Uint8>(green / 1.2f);
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blue = static_cast<Uint8>(blue / 1.2f);
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}
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int distX = static_cast<int>((abs (160.0f -x ) / 160.0f) *16);
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int distY = static_cast<int>((abs (120.0f -y ) / 120.0f)*32);
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red = std::max(red - ( distX +distY), 0);
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green = std::max(green - ( distX +distY), 0);
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blue = std::max(blue - ( distX +distY), 0);
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Uint32 finalPixel = ((red<<16) + (green<<8) + (blue<<0)) | (pixel &_src->format->Amask);
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DrawPixel(_ret,x,y, finalPixel);
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}
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}
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return _ret;
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}
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void FillRect( SDL_Surface* _surface, const int _x, const int _y, const int _w, const int _h, const int r, int g, int b )
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{
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SDL_Rect rect = {Sint16(_x),Sint16(_y),Sint16(_w),Sint16(_h)};
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Uint32 color;
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color = SDL_MapRGB(_surface->format, r, g, b);
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SDL_FillRect(_surface, &rect, color);
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}
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void FillRect( SDL_Surface* _surface, const int r, int g, int b )
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{
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SDL_Rect rect = {0,0,Uint16(_surface->w) ,Uint16(_surface->h) };
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Uint32 color;
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color = SDL_MapRGB(_surface->format, r, g, b);
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SDL_FillRect(_surface, &rect, color);
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}
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void FillRect( SDL_Surface* _surface, const int color )
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{
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SDL_Rect rect = {0,0,Uint16(_surface->w) ,Uint16(_surface->h) };
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SDL_FillRect(_surface, &rect, color);
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}
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void FillRect( SDL_Surface* _surface, const int x, const int y, const int w, const int h, int rgba )
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{
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SDL_Rect rect = {Sint16(x) ,Sint16(y) ,Sint16(w) ,Sint16(h) };
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SDL_FillRect(_surface, &rect, rgba);
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}
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void FillRect( SDL_Surface* _surface, SDL_Rect& _rect, const int r, int g, int b )
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{
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Uint32 color;
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color = SDL_MapRGB(_surface->format, r, g, b);
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SDL_FillRect(_surface, &_rect, color);
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}
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void FillRect( SDL_Surface* _surface, SDL_Rect rect, int rgba )
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{
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SDL_FillRect(_surface, &rect, rgba);
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}
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bool intersectRect( float left1, float right1, float bottom1, float top1, float left2, float right2, float bottom2, float top2 )
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{
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return !( left2 > right1 || right2 < left1 || top2 < bottom1 || bottom2 > top1);
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}
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void OverlaySurfaceKeyed( SDL_Surface* _src, SDL_Surface* _dest, Uint32 _key )
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{
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// const SDL_PixelFormat& fmt = *(_src->format);
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for(int x = 0; x < _src->w; x++)
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{
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for(int y = 0; y < _src->h; y++)
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{
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Uint32 pixel = ReadPixel(_src, x,y);
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//endian_swap(pixel);
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if (( pixel != _key))
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{
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DrawPixel(_dest,x,y, pixel);
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}
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}
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}
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}
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void ScrollSurface( SDL_Surface* _src, int _pX, int _pY )
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{
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SDL_Surface* part1 = NULL;
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SDL_Rect rect1;
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SDL_Rect rect2;
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//scrolling up;
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if(_pY < 0)
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{
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setRect(rect2, 0, 0, _src->w, _src->h - _pY);
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part1 = GetSubSurface(_src, rect2.x, rect2.y, rect2.w, rect2.h);
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SDL_Rect destrect1;
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SDL_SetSurfaceBlendMode(part1, SDL_BLENDMODE_NONE);
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setRect(destrect1, 0, _pY, _pX, _src->h);
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SDL_BlitSurface (part1, NULL, _src, &destrect1);
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}
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else if(_pY > 0)
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{
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setRect(rect1, 0, 0, _src->w, _src->h - _pY);
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part1 = GetSubSurface(_src, rect1.x, rect1.y, rect1.w, rect1.h);
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SDL_Rect destrect1;
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SDL_SetSurfaceBlendMode(part1, SDL_BLENDMODE_NONE);
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setRect(destrect1, _pX, _pY, _src->w, _src->h - _pY);
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SDL_BlitSurface (part1, NULL, _src, &destrect1);
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}
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//Right
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else if(_pX <= 0)
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{
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setRect(rect2, 0, 0, _src->w - _pX, _src->h );
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part1 = GetSubSurface(_src, rect2.x, rect2.y, rect2.w, rect2.h);
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SDL_Rect destrect1;
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SDL_SetSurfaceBlendMode(part1, SDL_BLENDMODE_NONE);
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setRect(destrect1, _pX, 0, _src->w - _pX, _src->h);
|
|
|
|
SDL_BlitSurface (part1, NULL, _src, &destrect1);
|
|
}
|
|
|
|
else if(_pX > 0)
|
|
{
|
|
|
|
setRect(rect1, _pX, 0, _src->w - _pX, _src->h );
|
|
|
|
part1 = GetSubSurface(_src, rect1.x, rect1.y, rect1.w, rect1.h);
|
|
|
|
SDL_Rect destrect1;
|
|
|
|
SDL_SetSurfaceBlendMode(part1, SDL_BLENDMODE_NONE);
|
|
|
|
setRect(destrect1, 0, 0, _src->w - _pX, _src->h);
|
|
|
|
SDL_BlitSurface (part1, NULL, _src, &destrect1);
|
|
|
|
}
|
|
//Cleanup temp surface
|
|
if (part1)
|
|
{
|
|
SDL_FreeSurface(part1);
|
|
}
|
|
|
|
}
|