Usermode/Applications/axwin3_src/WM/wm_render.c

   1 /*
   2  * Acess2 Window Manager v3
   3  * - By John Hodge (thePowersGang)
   4  *
   5  * wm_render.c
   6  * - Window rendering functions
   7  */
   8 #include <common.h>
   9 #include <wm.h>
  10 #include <wm_internals.h>
  11 #include <stdlib.h>
  12
  13 // === CODE ===
  14 void WM_Render_FillRect(tWindow *Window, int X, int Y, int W, int H, tColour Colour)
  15 {
  16         uint32_t        *dest;
  17          int    i;
  18
  19         X += Window->BorderL;
  20         Y += Window->BorderT;
  21
  22         // Clip to window dimensions
  23         if(X < 0) { W += X; X = 0; }
  24         if(Y < 0) { H += Y; Y = 0; }
  25         if(W <= 0 || H <= 0)    return;
  26         if(X >= Window->RealW)  return;
  27         if(Y >= Window->RealH)  return;
  28         if(X + W > Window->RealW)       W = Window->RealW - X;
  29         if(Y + H > Window->RealH)       H = Window->RealH - Y;
  30
  31         // TODO: Catch overflow into decorator area
  32
  33         if(!Window->RenderBuffer) {
  34                 Window->RenderBuffer = malloc(Window->RealW*Window->RealH*4);
  35         }
  36
  37         dest = (uint32_t*)Window->RenderBuffer + Y*Window->RealW + X;
  38         while( H -- )
  39         {
  40                 for( i = W; i --; )
  41                         *dest++ = Colour;
  42                 dest += Window->W - W;
  43         }
  44 }
  45
  46 void WM_Render_DrawRect(tWindow *Window, int X, int Y, int W, int H, tColour Colour)
  47 {
  48         WM_Render_FillRect(Window, X, Y, W, 1, Colour);
  49         WM_Render_FillRect(Window, X, Y+H-1, W, 1, Colour);
  50         WM_Render_FillRect(Window, X, Y, 1, H, Colour);
  51         WM_Render_FillRect(Window, X+W-1, Y, 1, H, Colour);
  52 }
  53
  54 /**
  55  * \brief Draw an image to the screen
  56  * \todo Maybe have support for an offset in the image
  57  */
  58 void WM_Render_DrawImage(tWindow *Window, int X, int Y, int W, int H, tImage *Image)
  59 {
  60          int    x, y;
  61         uint32_t        *dest;
  62         uint8_t *data;
  63
  64         // Sanity please
  65         if( !Image )    return ;
  66
  67         // Allocate
  68         if(!Window->RenderBuffer) {
  69                 Window->RenderBuffer = malloc(Window->W*Window->H*4);
  70         }
  71
  72         // Apply offset
  73         X += Window->BorderL;
  74         Y += Window->BorderT;
  75
  76         // Bounds Check
  77         if( X >= Window->RealW )        return ;
  78         if( Y >= Window->RealH )        return ;
  79
  80         // Wrap to image size
  81         if( W > Image->Width )  W = Image->Width;
  82         if( H > Image->Height ) H = Image->Height;
  83
  84         // Wrap to screen size
  85         if( X + W > Window->RealW )     W = Window->RealW - X;
  86         if( Y + H > Window->RealH )     H = Window->RealH - Y;
  87
  88         // TODO: Catch overflow into decorator area
  89         #if 0
  90         if( !Window->bDrawingDecorations )
  91         {
  92                 if( X < Window->BorderL )       return ;
  93                 if( Y < Window->BorderT )       return ;
  94                 if( X + W > Window->BorderL + Window->W )       W = X - (Window->BorderL + Window->W);
  95                 if( Y + H > Window->BorderT + Window->H )       H = Y - (Window->BorderT + Window->H);
  96         }
  97         #endif
  98
  99         dest = (uint32_t*)Window->RenderBuffer + Y * Window->RealW + X;
 100         data = Image->Data;
 101
 102         // Do the render
 103         switch( Image->Format )
 104         {
 105         case IMGFMT_BGRA:
 106                 for( y = 0; y < H; y ++ )
 107                 {
 108                          int    r, g, b, a;     // New
 109                          int    or, og, ob;     // Original
 110                         for( x = 0; x < W; x ++ )
 111                         {
 112                                 b = data[x*4+0]; g = data[x*4+1]; r = data[x*4+2]; a = data[x*4+3];
 113                                 if( a == 0 )    continue;       // 100% transparent
 114                                 ob = dest[x]&0xFF; og = (dest[x] >> 8)&0xFF; or = (dest[x] >> 16)&0xFF;
 115                                 // Handle Alpha
 116                                 switch(a)
 117                                 {
 118                                 // Transparent: Handled above
 119                                 // Solid
 120                                 case 0xFF:      break;
 121                                 // Half
 122                                 case 0x80:
 123                                         r = (or + r) / 2;
 124                                         g = (og + g) / 2;
 125                                         b = (ob + b) / 2;
 126                                         break;
 127                                 // General
 128                                 default:
 129                                         r = (or * (255-a) + r * a) / 255;
 130                                         g = (og * (255-a) + g * a) / 255;
 131                                         b = (ob * (255-a) + b * a) / 255;
 132                                         break;
 133                                 }
 134                                 dest[x] = b | (g << 8) | (r << 16);
 135                         }
 136                         data += Image->Width * 4;
 137                         dest += Window->RealW;
 138                 }
 139                 break;
 140
 141         // RGB
 142         case IMGFMT_RGB:
 143                 for( y = 0; y < H; y ++ )
 144                 {
 145                         for( x = 0; x < W; x ++ )
 146                         {
 147                                 //        Blue           Green                Red
 148                                 dest[x] = data[x*3+2] | (data[x*3+1] << 8) | (data[x*3+0] << 16);
 149                         }
 150                         data += W * 3;
 151                         dest += Window->RealW;
 152                 }
 153                 break;
 154         default:
 155                 _SysDebug("ERROR: Unknown image format %i\n", Image->Format);
 156                 break;
 157         }
 158 }
 159