Usermode/Applications/axwin2_src/WM/video.c

   1 /*
   2  * Acess GUI (AxWin) Version 2
   3  * By John Hodge (thePowersGang)
   4  */
   5 #include "common.h"
   6 #include <acess/sys.h>
   7 #include <acess/devices/terminal.h>
   8 #include <image.h>
   9
  10 // === PROTOTYPES ===
  11 void    Video_Setup(void);
  12 void    Video_Update(void);
  13 void    Video_FillRect(short X, short Y, short W, short H, uint32_t Color);
  14 void    Video_DrawRect(short X, short Y, short W, short H, uint32_t Color);
  15
  16 // === GLOBALS ===
  17
  18 // === CODE ===
  19 void Video_Setup(void)
  20 {
  21          int    tmpInt;
  22
  23         // Open terminal
  24         giTerminalFD = open(gsTerminalDevice, OPENFLAG_READ|OPENFLAG_WRITE);
  25         if( giTerminalFD == -1 )
  26         {
  27                 fprintf(stderr, "ERROR: Unable to open '%s' (%i)\n", gsTerminalDevice, _errno);
  28                 exit(-1);
  29         }
  30
  31         // Set width
  32         tmpInt = giScreenWidth;
  33         tmpInt = ioctl( giTerminalFD, TERM_IOCTL_WIDTH, &tmpInt );
  34         if(tmpInt != giScreenWidth)
  35         {
  36                 fprintf(stderr, "Warning: Selected width (%i) is invalid, clipped to %i\n",
  37                         giScreenWidth, tmpInt);
  38                 giScreenWidth = tmpInt;
  39         }
  40
  41         // Set height
  42         tmpInt = giScreenHeight;
  43         tmpInt = ioctl( giTerminalFD, TERM_IOCTL_HEIGHT, &tmpInt );
  44         if(tmpInt != giScreenHeight)
  45         {
  46                 fprintf(stderr, "Warning: Selected height (%i) is invalid, clipped to %i\n",
  47                         giScreenHeight, tmpInt);
  48                 giScreenHeight = tmpInt;
  49         }
  50
  51         // Set mode to video
  52         tmpInt = TERM_MODE_FB;
  53         ioctl( giTerminalFD, TERM_IOCTL_MODETYPE, &tmpInt );
  54
  55         // Force VT8 to be shown
  56         ioctl( giTerminalFD, TERM_IOCTL_FORCESHOW, NULL );
  57
  58         // Create local framebuffer (back buffer)
  59         gpScreenBuffer = malloc( giScreenWidth*giScreenHeight*4 );
  60         memset32( gpScreenBuffer, 0x8888FF, giScreenWidth*giScreenHeight );
  61         Video_Update();
  62 }
  63
  64 void Video_Update(void)
  65 {
  66         //seek(giTerminalFD, 0, SEEK_SET);
  67         seek(giTerminalFD, 0, 1);
  68         write(giTerminalFD, giScreenWidth*giScreenHeight*4, gpScreenBuffer);
  69 }
  70
  71 void Video_FillRect(short X, short Y, short W, short H, uint32_t Color)
  72 {
  73         uint32_t        *buf = gpScreenBuffer + Y*giScreenWidth + X;
  74
  75         _SysDebug("Video_FillRect: (X=%i, Y=%i, W=%i, H=%i, Color=%08x)",
  76                 X, Y, W, H, Color);
  77
  78         if(W < 0 || X < 0 || X >= giScreenWidth)        return ;
  79         if(X + W > giScreenWidth)       W = giScreenWidth - X;
  80
  81         if(H < 0 || Y < 0 || Y >= giScreenHeight)       return ;
  82         if(Y + H > giScreenHeight)      H = giScreenHeight - Y;
  83
  84         while( H -- )
  85         {
  86                 memset32( buf, Color, W );
  87                 buf += giScreenWidth;
  88         }
  89 }
  90
  91 void Video_DrawRect(short X, short Y, short W, short H, uint32_t Color)
  92 {
  93         Video_FillRect(X, Y, W, 1, Color);
  94         Video_FillRect(X, Y+H-1, W, 1, Color);
  95         Video_FillRect(X, Y, 1, H, Color);
  96         Video_FillRect(X+W-1, Y, 1, H, Color);
  97 }
  98
  99 /**
 100  * \brief Draw an image to the screen
 101  * \todo Maybe have support for an offset in the image
 102  */
 103 void Video_DrawImage(short X, short Y, short W, short H, tImage *Image)
 104 {
 105          int    x, y;
 106         uint8_t *buf = (uint8_t *)(gpScreenBuffer + Y*giScreenWidth + X);
 107         uint8_t *data = Image->Data;
 108
 109         // Bounds Check
 110         if( X >= giScreenWidth )        return ;
 111         if( Y >= giScreenHeight )       return ;
 112
 113         // Wrap to image size
 114         if( W > Image->Width )  W = Image->Width;
 115         if( H > Image->Height ) H = Image->Height;
 116
 117         // Wrap to screen size
 118         if( X + W > giScreenWidth )     W = giScreenWidth - X;
 119         if( Y + H > giScreenHeight )    H = giScreenHeight - Y;
 120
 121         switch( Image->Format )
 122         {
 123         case IMGFMT_BGRA:
 124                 for( y = 0; y < H; y ++ )
 125                 {
 126                          int    r, g, b, a;     // New
 127                          int    or, og, ob;     // Original
 128                         for( x = 0; x < W; x ++ ) {
 129                                 b = data[x*4+0]; g = data[x*4+1]; r = data[x*4+2]; a = data[x*4+3];
 130                                 if( a == 0 )    continue;       // 100% transparent
 131                                 ob = buf[x*4+0]; og = buf[x*4+1]; or = buf[x*4+2];
 132                                 // Handle Alpha
 133                                 switch(a)
 134                                 {
 135                                 // Transparent: Handled above
 136                                 // Solid
 137                                 case 0xFF:      break;
 138                                 // Half
 139                                 case 0x80:
 140                                         r = (or + r) / 2;
 141                                         g = (og + g) / 2;
 142                                         b = (ob + b) / 2;
 143                                         break;
 144                                 // General
 145                                 default:
 146                                         r = (or * (255-a) + r * a) / 255;
 147                                         g = (og * (255-a) + g * a) / 255;
 148                                         b = (ob * (255-a) + b * a) / 255;
 149                                         break;
 150                                 }
 151                                 buf[x*4+0] = b; buf[x*4+1] = g; buf[x*4+2] = r;
 152                         }
 153                         data += Image->Width * 4;
 154                         buf += giScreenWidth * 4;
 155                 }
 156                 break;
 157
 158         // RGB
 159         case IMGFMT_RGB:
 160                 for( y = 0; y < H; y ++ )
 161                 {
 162                         for( x = 0; x < W; x ++ ) {
 163                                 buf[x*4+0] = data[x*3+2];       // Blue
 164                                 buf[x*4+1] = data[x*3+1];       // Green
 165                                 buf[x*4+2] = data[x*3+0];       // Red
 166                         }
 167                         data += W * 3;
 168                         buf += giScreenWidth * 4;
 169                 }
 170                 break;
 171         }
 172 }