uisimulator/sdl/lcd-sdl.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2006 Dan Everton
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "lcd-sdl.h"
  23 #include "uisdl.h"
  24 #include "system.h" /* for MIN() and MAX() */
  25
  26 int display_zoom = 1;
  27
  28 void sdl_update_rect(SDL_Surface *surface, int x_start, int y_start, int width,
  29                      int height, int max_x, int max_y,
  30                      unsigned long (*getpixel)(int, int))
  31 {
  32     int x, y;
  33     int xmax, ymax;
  34     SDL_Rect dest;
  35
  36     ymax = y_start + height;
  37     xmax = x_start + width;
  38
  39     if(xmax > max_x)
  40         xmax = max_x;
  41     if(ymax >= max_y)
  42         ymax = max_y;
  43
  44     SDL_LockSurface(surface);
  45
  46     dest.w = display_zoom;
  47     dest.h = display_zoom;
  48
  49     for (x = x_start; x < xmax; x++) {
  50         dest.x = x * display_zoom;
  51
  52 #ifdef HAVE_LCD_SPLIT
  53         for (y = y_start; y < MIN(ymax, LCD_SPLIT_POS); y++) {
  54             dest.y = y * display_zoom;
  55
  56             SDL_FillRect(surface, &dest, (Uint32)(getpixel(x, y) | 0x80));
  57         }
  58         for (y = MAX(y_start, LCD_SPLIT_POS); y < ymax; y++) {
  59             dest.y = (y + LCD_SPLIT_LINES) * display_zoom ;
  60
  61             SDL_FillRect(surface, &dest, (Uint32)getpixel(x, y));
  62         }
  63 #else
  64         for (y = y_start; y < ymax; y++) {
  65             dest.y = y * display_zoom;
  66
  67             SDL_FillRect(surface, &dest, (Uint32)getpixel(x, y));
  68         }
  69 #endif
  70     }
  71
  72     SDL_UnlockSurface(surface);
  73 }
  74
  75 void sdl_gui_update(SDL_Surface *surface, int x_start, int y_start, int width,
  76                     int height, int max_x, int max_y, int ui_x, int ui_y)
  77 {
  78     if (x_start + width > max_x)
  79         width = max_x - x_start;
  80     if (y_start + height > max_y)
  81         height = max_y - y_start;
  82
  83     SDL_Rect src = {x_start * display_zoom, y_start * display_zoom,
  84                     width * display_zoom, height * display_zoom};
  85     SDL_Rect dest= {(ui_x + x_start) * display_zoom,
  86                     (ui_y + y_start) * display_zoom,
  87                     width * display_zoom, height * display_zoom};
  88
  89     if (surface->flags & SDL_SRCALPHA) /* alpha needs a black background */
  90         SDL_FillRect(gui_surface, &dest, 0);
  91
  92     SDL_BlitSurface(surface, &src, gui_surface, &dest);
  93
  94     SDL_Flip(gui_surface);
  95 }
  96
  97 /* set a range of bitmap indices to a gradient from startcolour to endcolour */
  98 void sdl_set_gradient(SDL_Surface *surface, SDL_Color *start, SDL_Color *end,
  99                       int first, int steps)
 100 {
 101     int i;
 102     SDL_Color palette[steps];
 103
 104     for (i = 0; i < steps; i++) {
 105         palette[i].r = start->r + (end->r - start->r) * i / (steps - 1);
 106         palette[i].g = start->g + (end->g - start->g) * i / (steps - 1);
 107         palette[i].b = start->b + (end->b - start->b) * i / (steps - 1);
 108     }
 109
 110     SDL_SetPalette(surface, SDL_LOGPAL|SDL_PHYSPAL, palette, first, steps);
 111 }
 112