Usermode/Applications/axwin3_src/WM/video.c

   1 /*
   2  * Acess2 GUI (AxWin) Version 3
   3  * - By John Hodge (thePowersGang)
   4  *
   5  * video.c
   6  * - Video methods
   7  */
   8 #include "common.h"
   9 #include <acess/sys.h>
  10 #include <acess/devices/terminal.h>
  11 #include <image.h>
  12 #include "resources/cursor.h"
  13
  14 // === PROTOTYPES ===
  15 void    Video_Setup(void);
  16 void    Video_SetCursorPos(short X, short Y);
  17 void    Video_Update(void);
  18 void    Video_FillRect(short X, short Y, short W, short H, uint32_t Color);
  19 void    Video_DrawRect(short X, short Y, short W, short H, uint32_t Color);
  20
  21 // === GLOBALS ===
  22  int    giVideo_CursorX;
  23  int    giVideo_CursorY;
  24
  25 // === CODE ===
  26 void Video_Setup(void)
  27 {
  28          int    tmpInt;
  29
  30         // Open terminal
  31         giTerminalFD = open(gsTerminalDevice, OPENFLAG_READ|OPENFLAG_WRITE);
  32         if( giTerminalFD == -1 )
  33         {
  34                 fprintf(stderr, "ERROR: Unable to open '%s' (%i)\n", gsTerminalDevice, _errno);
  35                 exit(-1);
  36         }
  37
  38         // Set width
  39         tmpInt = giScreenWidth;
  40         tmpInt = ioctl( giTerminalFD, TERM_IOCTL_WIDTH, &tmpInt );
  41         if(tmpInt != giScreenWidth)
  42         {
  43                 fprintf(stderr, "Warning: Selected width (%i) is invalid, clipped to %i\n",
  44                         giScreenWidth, tmpInt);
  45                 giScreenWidth = tmpInt;
  46         }
  47
  48         // Set height
  49         tmpInt = giScreenHeight;
  50         tmpInt = ioctl( giTerminalFD, TERM_IOCTL_HEIGHT, &tmpInt );
  51         if(tmpInt != giScreenHeight)
  52         {
  53                 fprintf(stderr, "Warning: Selected height (%i) is invalid, clipped to %i\n",
  54                         giScreenHeight, tmpInt);
  55                 giScreenHeight = tmpInt;
  56         }
  57
  58         // Set mode to video
  59         tmpInt = TERM_MODE_FB;
  60         ioctl( giTerminalFD, TERM_IOCTL_MODETYPE, &tmpInt );
  61
  62         // Force VT to be shown
  63         ioctl( giTerminalFD, TERM_IOCTL_FORCESHOW, NULL );
  64
  65         // Create local framebuffer (back buffer)
  66         gpScreenBuffer = malloc( giScreenWidth*giScreenHeight*4 );
  67         memset32( gpScreenBuffer, 0x8888FF, giScreenWidth*giScreenHeight );
  68
  69         // Set cursor position and bitmap
  70         ioctl(giTerminalFD, TERM_IOCTL_SETCURSORBITMAP, &cCursorBitmap);
  71         Video_SetCursorPos( giScreenWidth/2, giScreenHeight/2 );
  72
  73         Video_Update();
  74 }
  75
  76 void Video_Update(void)
  77 {
  78         //seek(giTerminalFD, 0, SEEK_SET);
  79         seek(giTerminalFD, 0, 1);
  80         write(giTerminalFD, gpScreenBuffer, giScreenWidth*giScreenHeight*4);
  81 }
  82
  83 void Video_SetCursorPos(short X, short Y)
  84 {
  85         struct {
  86                 uint16_t        x;
  87                 uint16_t        y;
  88         } pos;
  89         pos.x = giVideo_CursorX = X;
  90         pos.y = giVideo_CursorY = Y;
  91         ioctl(giTerminalFD, TERM_IOCTL_GETSETCURSOR, &pos);
  92 }
  93
  94 void Video_FillRect(short X, short Y, short W, short H, uint32_t Color)
  95 {
  96         uint32_t        *buf = gpScreenBuffer + Y*giScreenWidth + X;
  97
  98         _SysDebug("Video_FillRect: (X=%i, Y=%i, W=%i, H=%i, Color=%08x)",
  99                 X, Y, W, H, Color);
 100
 101         if(W < 0 || X < 0 || X >= giScreenWidth)        return ;
 102         if(X + W > giScreenWidth)       W = giScreenWidth - X;
 103
 104         if(H < 0 || Y < 0 || Y >= giScreenHeight)       return ;
 105         if(Y + H > giScreenHeight)      H = giScreenHeight - Y;
 106
 107         while( H -- )
 108         {
 109                 memset32( buf, Color, W );
 110                 buf += giScreenWidth;
 111         }
 112 }
 113
 114 void Video_DrawRect(short X, short Y, short W, short H, uint32_t Color)
 115 {
 116         Video_FillRect(X, Y, W, 1, Color);
 117         Video_FillRect(X, Y+H-1, W, 1, Color);
 118         Video_FillRect(X, Y, 1, H, Color);
 119         Video_FillRect(X+W-1, Y, 1, H, Color);
 120 }
 121
 122 /**
 123  * \brief Draw an image to the screen
 124  * \todo Maybe have support for an offset in the image
 125  */
 126 void Video_DrawImage(short X, short Y, short W, short H, tImage *Image)
 127 {
 128          int    x, y;
 129         uint8_t *buf = (uint8_t *)(gpScreenBuffer + Y*giScreenWidth + X);
 130         uint8_t *data;
 131
 132         // Sanity please
 133         if( !Image )
 134                 return ;
 135
 136         // Bounds Check
 137         if( X >= giScreenWidth )        return ;
 138         if( Y >= giScreenHeight )       return ;
 139
 140         // Wrap to image size
 141         if( W > Image->Width )  W = Image->Width;
 142         if( H > Image->Height ) H = Image->Height;
 143
 144         // Wrap to screen size
 145         if( X + W > giScreenWidth )     W = giScreenWidth - X;
 146         if( Y + H > giScreenHeight )    H = giScreenHeight - Y;
 147
 148         // Do the render
 149         data = Image->Data;
 150         switch( Image->Format )
 151         {
 152         case IMGFMT_BGRA:
 153                 for( y = 0; y < H; y ++ )
 154                 {
 155                          int    r, g, b, a;     // New
 156                          int    or, og, ob;     // Original
 157                         for( x = 0; x < W; x ++ )
 158                         {
 159                                 b = data[x*4+0]; g = data[x*4+1]; r = data[x*4+2]; a = data[x*4+3];
 160                                 if( a == 0 )    continue;       // 100% transparent
 161                                 ob = buf[x*4+0]; og = buf[x*4+1]; or = buf[x*4+2];
 162                                 // Handle Alpha
 163                                 switch(a)
 164                                 {
 165                                 // Transparent: Handled above
 166                                 // Solid
 167                                 case 0xFF:      break;
 168                                 // Half
 169                                 case 0x80:
 170                                         r = (or + r) / 2;
 171                                         g = (og + g) / 2;
 172                                         b = (ob + b) / 2;
 173                                         break;
 174                                 // General
 175                                 default:
 176                                         r = (or * (255-a) + r * a) / 255;
 177                                         g = (og * (255-a) + g * a) / 255;
 178                                         b = (ob * (255-a) + b * a) / 255;
 179                                         break;
 180                                 }
 181                                 buf[x*4+0] = b; buf[x*4+1] = g; buf[x*4+2] = r;
 182                         }
 183                         data += Image->Width * 4;
 184                         buf += giScreenWidth * 4;
 185                 }
 186                 break;
 187
 188         // RGB
 189         case IMGFMT_RGB:
 190                 for( y = 0; y < H; y ++ )
 191                 {
 192                         for( x = 0; x < W; x ++ )
 193                         {
 194                                 buf[x*4+0] = data[x*3+2];       // Blue
 195                                 buf[x*4+1] = data[x*3+1];       // Green
 196                                 buf[x*4+2] = data[x*3+0];       // Red
 197                         }
 198                         data += W * 3;
 199                         buf += giScreenWidth * 4;
 200                 }
 201                 break;
 202         default:
 203                 _SysDebug("ERROR: Unknown image format %i\n", Image->Format);
 204                 break;
 205         }
 206 }