firmware/target/hosted/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 <SDL.h>
  23 #include "lcd-sdl.h"
  24 #include "sim-ui-defines.h"
  25 #include "system.h" /* for MIN() and MAX() */
  26
  27 int display_zoom = 1;
  28
  29 void sdl_update_rect(SDL_Surface *surface, int x_start, int y_start, int width,
  30                      int height, int max_x, int max_y,
  31                      unsigned long (*getpixel)(int, int))
  32 {
  33     SDL_Rect dest;
  34 #if LCD_DEPTH >= 8 && (LCD_PIXELFORMAT == RGB565) \
  35     && !defined(LCD_STRIDEFORMAT) && !defined(HAVE_LCD_SPLIT) \
  36     && !defined(HAVE_REMOTE_LCD)
  37     SDL_Rect src;
  38     (void)max_x;
  39     (void)max_y;
  40     (void)getpixel;
  41     /* Update complete screen via one blit operation (fast) */
  42     SDL_Surface *lcd = SDL_CreateRGBSurfaceFrom(lcd_framebuffer, LCD_FBWIDTH,
  43                                                 LCD_FBHEIGHT, LCD_DEPTH,
  44                                                 LCD_FBWIDTH * LCD_DEPTH/8,
  45                                                 0, 0, 0, 0);
  46     src.x = x_start;
  47     src.y = y_start;
  48     src.w = width;
  49     src.h = height;
  50
  51     if (display_zoom == 1) {
  52         dest = src;
  53         SDL_BlitSurface(lcd, &src, surface, &dest);
  54     } else {
  55         /* Note: SDL_SoftStretch is currently marked as DO NOT USE
  56            but there are no real alternatives for efficent zooming. */
  57         dest.x = src.x * display_zoom;
  58         dest.y = src.y * display_zoom;
  59         dest.w = src.w * display_zoom;
  60         dest.h = src.h * display_zoom;
  61         SDL_SoftStretch(lcd, &src, surface, &dest);
  62     }
  63     SDL_FreeSurface(lcd);
  64 #else
  65     int x, y;
  66     int xmax, ymax;
  67     /* Very slow pixel-by-pixel drawing */
  68     ymax = y_start + height;
  69     xmax = x_start + width;
  70
  71     if(xmax > max_x)
  72         xmax = max_x;
  73     if(ymax >= max_y)
  74         ymax = max_y;
  75
  76     dest.w = display_zoom;
  77     dest.h = display_zoom;
  78
  79     for (x = x_start; x < xmax; x++) {
  80         dest.x = x * display_zoom;
  81
  82 #ifdef HAVE_LCD_SPLIT
  83         for (y = y_start; y < MIN(ymax, LCD_SPLIT_POS); y++) {
  84             dest.y = y * display_zoom;
  85
  86             SDL_FillRect(surface, &dest, (Uint32)(getpixel(x, y) | 0x80));
  87         }
  88         for (y = MAX(y_start, LCD_SPLIT_POS); y < ymax; y++) {
  89             dest.y = (y + LCD_SPLIT_LINES) * display_zoom ;
  90
  91             SDL_FillRect(surface, &dest, (Uint32)getpixel(x, y));
  92         }
  93 #else
  94         for (y = y_start; y < ymax; y++) {
  95             dest.y = y * display_zoom;
  96
  97             SDL_FillRect(surface, &dest, (Uint32)getpixel(x, y));
  98         }
  99 #endif
 100     }
 101 #endif
 102 }
 103
 104 void sdl_gui_update(SDL_Surface *surface, int x_start, int y_start, int width,
 105                     int height, int max_x, int max_y, int ui_x, int ui_y)
 106 {
 107     if (x_start + width > max_x)
 108         width = max_x - x_start;
 109     if (y_start + height > max_y)
 110         height = max_y - y_start;
 111
 112     SDL_Rect src = {x_start * display_zoom, y_start * display_zoom,
 113                     width * display_zoom, height * display_zoom};
 114     SDL_Rect dest= {(ui_x + x_start) * display_zoom,
 115                     (ui_y + y_start) * display_zoom,
 116                     width * display_zoom, height * display_zoom};
 117
 118     if (surface->flags & SDL_SRCALPHA) /* alpha needs a black background */
 119         SDL_FillRect(gui_surface, &dest, 0);
 120
 121     SDL_BlitSurface(surface, &src, gui_surface, &dest);
 122
 123     SDL_Flip(gui_surface);
 124 }
 125
 126 /* set a range of bitmap indices to a gradient from startcolour to endcolour */
 127 void sdl_set_gradient(SDL_Surface *surface, SDL_Color *start, SDL_Color *end,
 128                       int first, int steps)
 129 {
 130     int i;
 131     SDL_Color palette[steps];
 132
 133     for (i = 0; i < steps; i++) {
 134         palette[i].r = start->r + (end->r - start->r) * i / (steps - 1);
 135         palette[i].g = start->g + (end->g - start->g) * i / (steps - 1);
 136         palette[i].b = start->b + (end->b - start->b) * i / (steps - 1);
 137     }
 138
 139     SDL_SetPalette(surface, SDL_LOGPAL|SDL_PHYSPAL, palette, first, steps);
 140 }
 141
 142 int lcd_get_dpi(void)
 143 {
 144     /* TODO: find a way to query it from the OS, SDL doesn't support it
 145      * directly; for now assume the more or less standard 96 */
 146     return 96;
 147 }