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VVVVVV/desktop_version/src/GraphicsUtil.cpp
Misa 7c511b1550 Fix mixed indentation in GraphicsUtil.cpp 
To be fair, it was more on the level of entire functions using different
indentation than the surrounding code, but it's not consistent enough
for me to justify leaving it alone.
2020-04-03 10:40:50 -04:00

529 lines
14 KiB
C++
Raw Blame History

#include "Graphics.h"
void setRect( SDL_Rect& _r, int x, int y, int w, int h )
{
_r.x = x;
_r.y = y;
_r.w = w;
_r.h = h;
}
unsigned int endian_swap( unsigned int x )
{
return (x>>24) |
((x<<8) & 0x00FF0000) |
((x>>8) & 0x0000FF00) |
(x<<24);
}
template <class T>
void endian_swap(T *objp)
{
unsigned char *memp = reinterpret_cast<unsigned char*>(objp);
std::reverse(memp, memp + sizeof(T));
}
SDL_Surface* GetSubSurface( SDL_Surface* metaSurface, int x, int y, int width, int height )
{
// Create an SDL_Rect with the area of the _surface
SDL_Rect area;
area.x = x;
area.y = y;
area.w = width;
area.h = height;
// Set the RGBA mask values.
Uint32 r, g, b, a;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
r = 0xff000000;
g = 0x00ff0000;
b = 0x0000ff00;
a = 0x000000ff;
#else
r = 0x000000ff;
g = 0x0000ff00;
b = 0x00ff0000;
a = 0xff000000;
#endif
//Convert to the correct display format after nabbing the new _surface or we will slow things down.
SDL_Surface* preSurface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32, r, g, b, a);
//SDL_Surface* subSurface = SDL_DisplayFormatAlpha(preSurface);
//SDL_FreeSurface(preSurface);
// Lastly, apply the area from the meta _surface onto the whole of the sub _surface.
SDL_BlitSurface(metaSurface, &area, preSurface, 0);
// Return the new Bitmap _surface
return preSurface;
}
void DrawPixel( SDL_Surface *_surface, int x, int y, Uint32 pixel )
{
int bpp = _surface->format->BytesPerPixel;
/* Here p is the address to the pixel we want to set */
Uint8 *p = (Uint8 *)_surface->pixels + y * _surface->pitch + x * bpp;
switch(bpp)
{
case 1:
*p = pixel;
break;
case 2:
*(Uint16 *)p = pixel;
break;
case 3:
if(SDL_BYTEORDER != SDL_BIG_ENDIAN)
{
p[0] = (pixel >> 16) & 0xff;
p[1] = (pixel >> 8) & 0xff;
p[2] = pixel & 0xff;
}
else
{
p[0] = pixel & 0xff;
p[1] = (pixel >> 8) & 0xff;
p[2] = (pixel >> 16) & 0xff;
}
break;
case 4:
*(Uint32 *)p = pixel;
break;
}
}
Uint32 ReadPixel( SDL_Surface *_surface, int x, int y )
{
int bpp = _surface->format->BytesPerPixel;
/* Here p is the address to the pixel we want to retrieve */
Uint8 *p = (Uint8 *)_surface->pixels + y * _surface->pitch + x * bpp;
switch(bpp)
{
case 1:
return *p;
break;
case 2:
return *(Uint16 *)p;
break;
case 3:
if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
return p[0] << 16 | p[1] << 8 | p[2];
else
return p[0] | p[1] << 8 | p[2] << 16;
break;
case 4:
return *(Uint32 *)p;
break;
default:
return 0; /* shouldn't happen, but avoids warnings */
}
}
SDL_Surface * ScaleSurface( SDL_Surface *_surface, int Width, int Height, SDL_Surface * Dest )
{
if(!_surface || !Width || !Height)
return 0;
SDL_Surface *_ret;
if(Dest == NULL)
{
_ret = SDL_CreateRGBSurface(_surface->flags, Width, Height, _surface->format->BitsPerPixel,
_surface->format->Rmask, _surface->format->Gmask, _surface->format->Bmask, _surface->format->Amask);
if(_ret == NULL)
{
return NULL;
}
}
else
{
_ret = Dest;
}
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));
SDL_Rect gigantoPixel;
for(Sint32 y = 0; y < _surface->h; y++)
for(Sint32 x = 0; x < _surface->w; x++)
{
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)) ;
SDL_FillRect(_ret, &gigantoPixel, ReadPixel(_surface, x, y));
}
// DrawPixel(_ret, static_cast<Sint32>(_stretch_factor_x * x) + o_x,
//static_cast<Sint32>(_stretch_factor_y * y) + o_y, ReadPixel(_surface, x, y));
return _ret;
}
SDL_Surface * ScaleSurfaceSlow( SDL_Surface *_surface, int Width, int Height)
{
if(!_surface || !Width || !Height)
return 0;
SDL_Surface *_ret;
_ret = SDL_CreateRGBSurface(_surface->flags, Width, Height, _surface->format->BitsPerPixel,
_surface->format->Rmask, _surface->format->Gmask, _surface->format->Bmask, _surface->format->Amask);
if(_ret == NULL)
{
return NULL;
}
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));
for(Sint32 y = 0; y < _surface->h; y++)
for(Sint32 x = 0; x < _surface->w; x++)
for(Sint32 o_y = 0; o_y < _stretch_factor_y; ++o_y)
for(Sint32 o_x = 0; o_x < _stretch_factor_x; ++o_x)
DrawPixel(_ret, static_cast<Sint32>(_stretch_factor_x * x) + o_x,
static_cast<Sint32>(_stretch_factor_y * y) + o_y, ReadPixel(_surface, x, y));
// DrawPixel(_ret, static_cast<Sint32>(_stretch_factor_x * x) + o_x,
//static_cast<Sint32>(_stretch_factor_y * y) + o_y, ReadPixel(_surface, x, y));
return _ret;
}
SDL_Surface * FlipSurfaceHorizontal(SDL_Surface* _src)
{
SDL_Surface * ret = SDL_CreateRGBSurface(_src->flags, _src->w, _src->h, _src->format->BitsPerPixel,
_src->format->Rmask, _src->format->Gmask, _src->format->Bmask, _src->format->Amask);
if(ret == NULL)
{
return NULL;
}
for(Sint32 y = 0; y < _src->h; y++)
{
for(Sint32 x = 0; x < _src->w; x++)
{
DrawPixel(ret,(_src->w -1) -x,y,ReadPixel(_src, x, y));
}
}
return ret;
}
SDL_Surface * FlipSurfaceVerticle(SDL_Surface* _src)
{
SDL_Surface * ret = SDL_CreateRGBSurface(_src->flags, _src->w, _src->h, _src->format->BitsPerPixel,
_src->format->Rmask, _src->format->Gmask, _src->format->Bmask, _src->format->Amask);
if(ret == NULL)
{
return NULL;
}
for(Sint32 y = 0; y < _src->h; y++)
{
for(Sint32 x = 0; x < _src->w; x++)
{
DrawPixel(ret, x ,(_src->h-1) - y ,ReadPixel(_src, x, y));
}
}
return ret;
}
void BlitSurfaceStandard( SDL_Surface* _src, SDL_Rect* _srcRect, SDL_Surface* _dest, SDL_Rect* _destRect )
{
//SDL_Rect tempRect = *_destRect;
//tempRect.w ;
//tempRect.h ;
//tempRect.x *=globalScale;
//tempRect.y *=globalScale;
//if(globalScale != 1)
//{
// SDL_Surface* tempScaled = ScaleSurface(_src, tempRect.w, tempRect.h);
// SDL_BlitSurface( tempScaled, _srcRect, _dest, &tempRect );
// SDL_FreeSurface(tempScaled);
//}
//else
//{
SDL_BlitSurface( _src, _srcRect, _dest, _destRect );
//}
}
void BlitSurfaceColoured(
SDL_Surface* _src,
SDL_Rect* _srcRect,
SDL_Surface* _dest,
SDL_Rect* _destRect,
colourTransform& ct
) {
SDL_Rect *tempRect = _destRect;
const SDL_PixelFormat& fmt = *(_src->format);
// const SDL_PixelFormat& destfmt = *(_dest->format);
SDL_Surface* tempsurface = SDL_CreateRGBSurface(
SDL_SWSURFACE,
_src->w,
_src->h,
fmt.BitsPerPixel,
fmt.Rmask,
fmt.Gmask,
fmt.Bmask,
fmt.Amask
);
for(int x = 0; x < tempsurface->w; x++)
{
for(int y = 0; y < tempsurface->h; y++)
{
Uint32 pixel = ReadPixel(_src, x, y);
Uint32 Alpha = pixel & fmt.Amask;
Uint32 result = ct.colour & 0x00FFFFFF;
Uint32 CTAlpha = ct.colour & fmt.Amask;
float div1 = ((Alpha >> 24) / 255.0f);
float div2 = ((CTAlpha >> 24) / 255.0f);
Uint32 UseAlpha = (div1 * div2) * 255.0f;
DrawPixel(tempsurface, x, y, result | (UseAlpha << 24));
}
}
SDL_BlitSurface(tempsurface, _srcRect, _dest, tempRect);
SDL_FreeSurface(tempsurface);
}
int scrollamount = 0;
bool isscrolling = 0;
SDL_Surface* ApplyFilter( SDL_Surface* _src )
{
SDL_Surface* _ret = SDL_CreateRGBSurface(_src->flags, _src->w, _src->h, 32,
_src->format->Rmask, _src->format->Gmask, _src->format->Bmask, _src->format->Amask);
if (rand() % 4000 < 8)
{
isscrolling = true;
}
if(isscrolling == true)
{
scrollamount += 20;
if(scrollamount > 240)
{
scrollamount = 0;
isscrolling = false;
}
}
int redOffset = rand() % 4;
for(int x = 0; x < _src->w; x++)
{
for(int y = 0; y < _src->h; y++)
{
int sampley = (y + scrollamount )% 240;
Uint32 pixel = ReadPixel(_src, x,sampley);
Uint8 green = (pixel & _src->format->Gmask) >> 8;
Uint8 blue = (pixel & _src->format->Bmask) >> 0;
Uint32 pixelOffset = ReadPixel(_src, std::min(x+redOffset, 319), sampley) ;
Uint8 red = (pixelOffset & _src->format->Rmask) >> 16 ;
if(isscrolling && sampley > 220 && ((rand() %10) < 4))
{
red = std::min(int(red+(fRandom() * 0.6) * 254) , 255);
green = std::min(int(green+(fRandom() * 0.6) * 254) , 255);
blue = std::min(int(blue+(fRandom() * 0.6) * 254) , 255);
}
else
{
red = std::min(int(red+(fRandom() * 0.2) * 254) , 255);
green = std::min(int(green+(fRandom() * 0.2) * 254) , 255);
blue = std::min(int(blue+(fRandom() * 0.2) * 254) , 255);
}
if(y % 2 == 0)
{
red = static_cast<Uint8>(red / 1.2f);
green = static_cast<Uint8>(green / 1.2f);
blue = static_cast<Uint8>(blue / 1.2f);
}
int distX = static_cast<int>((abs (160.0f -x ) / 160.0f) *16);
int distY = static_cast<int>((abs (120.0f -y ) / 120.0f)*32);
red = std::max(red - ( distX +distY), 0);
green = std::max(green - ( distX +distY), 0);
blue = std::max(blue - ( distX +distY), 0);
Uint32 finalPixel = ((red<<16) + (green<<8) + (blue<<0)) | (pixel &_src->format->Amask);
DrawPixel(_ret,x,y, finalPixel);
}
}
return _ret;
}
void FillRect( SDL_Surface* _surface, const int _x, const int _y, const int _w, const int _h, const int r, int g, int b )
{
SDL_Rect rect = {Sint16(_x),Sint16(_y),Sint16(_w),Sint16(_h)};
Uint32 color;
color = SDL_MapRGB(_surface->format, r, g, b);
SDL_FillRect(_surface, &rect, color);
}
void FillRect( SDL_Surface* _surface, const int r, int g, int b )
{
SDL_Rect rect = {0,0,Uint16(_surface->w) ,Uint16(_surface->h) };
Uint32 color;
color = SDL_MapRGB(_surface->format, r, g, b);
SDL_FillRect(_surface, &rect, color);
}
void FillRect( SDL_Surface* _surface, const int color )
{
SDL_Rect rect = {0,0,Uint16(_surface->w) ,Uint16(_surface->h) };
SDL_FillRect(_surface, &rect, color);
}
void FillRect( SDL_Surface* _surface, const int x, const int y, const int w, const int h, int rgba )
{
SDL_Rect rect = {Sint16(x) ,Sint16(y) ,Sint16(w) ,Sint16(h) };
SDL_FillRect(_surface, &rect, rgba);
}
void FillRect( SDL_Surface* _surface, SDL_Rect& _rect, const int r, int g, int b )
{
Uint32 color;
color = SDL_MapRGB(_surface->format, r, g, b);
SDL_FillRect(_surface, &_rect, color);
}
void FillRect( SDL_Surface* _surface, SDL_Rect rect, int rgba )
{
SDL_FillRect(_surface, &rect, rgba);
}
bool intersectRect( float left1, float right1, float bottom1, float top1, float left2, float right2, float bottom2, float top2 )
{
return !( left2 > right1 || right2 < left1 || top2 < bottom1 || bottom2 > top1);
}
void OverlaySurfaceKeyed( SDL_Surface* _src, SDL_Surface* _dest, Uint32 _key )
{
// const SDL_PixelFormat& fmt = *(_src->format);
for(int x = 0; x < _src->w; x++)
{
for(int y = 0; y < _src->h; y++)
{
Uint32 pixel = ReadPixel(_src, x,y);
//endian_swap(pixel);
if (( pixel != _key))
{
DrawPixel(_dest,x,y, pixel);
}
}
}
}
void ScrollSurface( SDL_Surface* _src, int _pX, int _pY )
{
SDL_Surface* part1 = NULL;
SDL_Rect rect1;
SDL_Rect rect2;
//scrolling up;
if(_pY < 0)
{
setRect(rect2, 0, 0, _src->w, _src->h - _pY);
part1 = GetSubSurface(_src, rect2.x, rect2.y, rect2.w, rect2.h);
SDL_Rect destrect1;
SDL_SetSurfaceBlendMode(part1, SDL_BLENDMODE_NONE);
setRect(destrect1, 0, _pY, _pX, _src->h);
SDL_BlitSurface (part1, NULL, _src, &destrect1);
}
else if(_pY > 0)
{
setRect(rect1, 0, 0, _src->w, _src->h - _pY);
part1 = GetSubSurface(_src, rect1.x, rect1.y, rect1.w, rect1.h);
SDL_Rect destrect1;
SDL_SetSurfaceBlendMode(part1, SDL_BLENDMODE_NONE);
setRect(destrect1, _pX, _pY, _src->w, _src->h - _pY);
SDL_BlitSurface (part1, NULL, _src, &destrect1);
}
//Right
else if(_pX <= 0)
{
setRect(rect2, 0, 0, _src->w - _pX, _src->h );
part1 = GetSubSurface(_src, rect2.x, rect2.y, rect2.w, rect2.h);
SDL_Rect destrect1;
SDL_SetSurfaceBlendMode(part1, SDL_BLENDMODE_NONE);
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);
}
}
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