mode 7

void mode_7(SDL_Texture *Tile, int ScrollX, int ScrollY, int CenterX, int CenterY, double ScaleX, double ScaleY, double Angle) {
  SDL_SetRenderDrawColor(ScreenRenderer, 64, 64, 64, 255);
  SDL_RenderClear(ScreenRenderer);

  double M7A = +cos(Angle)*ScaleX;
  double M7B = +sin(Angle)*ScaleX;
  double M7C = -sin(Angle)*ScaleY;
  double M7D = +cos(Angle)*ScaleY;
/*
  ( VRAM.X )  =  ( M7A M7B )  *  ( ScreenX+ScrollX-CenterX )  +  ( CenterX )
  ( VRAM.Y )     ( M7C M7D )     ( ScreenY+ScrollY-CenterY )     ( CenterY )
*/

  for(int ScreenY=0; ScreenY<ScreenHeight; ScreenY++) {
    double temp1 = 0+ScrollX-CenterX;
    double temp2 = ScreenY+ScrollY-CenterY;
    double src_x = M7A*temp1 + M7B*temp2 + CenterX;
    double src_y = M7C*temp1 + M7D*temp2 + CenterY;

    for(int ScreenX=0; ScreenX<ScreenWidth; ScreenX++) {
       blit(Tile, ScreenRenderer, (int)src_x, (int)src_y, ScreenX, ScreenY, 1, 1);
       src_x += M7A;
       src_y += M7C;
    }
  }
}