1 files changed, 76 insertions, 6 deletions

diff --git a/uisimulator/sdl/lcd-sdl.c b/uisimulator/sdl/lcd-sdl.c
index 1014a371c0..a3dc87fed0 100644
--- a/uisimulator/sdl/lcd-sdl.c
+++ b/uisimulator/sdl/lcd-sdl.c
@@ -23,6 +23,9 @@
 #include "uisdl.h"
 
 int display_zoom = 1;
+#ifdef UI_LCD_SPLIT
+static int gradient_steps = 0;
+#endif
 
 void sdl_update_rect(SDL_Surface *surface, int x_start, int y_start, int width,
                      int height, int max_x, int max_y,
@@ -44,13 +47,13 @@ void sdl_update_rect(SDL_Surface *surface, int x_start, int y_start, int width,
 
     dest.w = display_zoom;
     dest.h = display_zoom;
-    
+
     for (x = x_start; x < xmax; x++) {
         dest.x = x * display_zoom;
 
         for (y = y_start; y < ymax; y++) {
             dest.y = y * display_zoom;
-            
+
             SDL_FillRect(surface, &dest, (Uint32)getpixel(x, y));
         }
     }
@@ -58,9 +61,11 @@ void sdl_update_rect(SDL_Surface *surface, int x_start, int y_start, int width,
     SDL_UnlockSurface(surface);
 }
 
-void sdl_gui_update(SDL_Surface *surface, int x_start, int y_start, int width,
+void sdl_gui_update(SDL_Surface *surface, IFSPLIT(SDL_Surface *real_surface,)
+                    int x_start, int y_start, int width,
                     int height, int max_x, int max_y, int ui_x, int ui_y)
 {
+    printf("(%d, %d, %d, %d);\n", x_start, y_start, width, height);
     int xmax, ymax;
 
     ymax = y_start + height;
@@ -76,16 +81,73 @@ void sdl_gui_update(SDL_Surface *surface, int x_start, int y_start, int width,
     SDL_Rect dest= {(ui_x + x_start) * display_zoom, (ui_y + y_start) * display_zoom,
                     xmax * display_zoom, ymax * display_zoom};
 
+#ifdef UI_LCD_SPLIT
+    /* fix real screen coordinates */
+    if(ymax >= UI_LCD_SPLIT_LINES)
+        src.h += UI_LCD_SPLIT_BLACK_LINES * display_zoom;
+
+    SDL_LockSurface(surface);
+    SDL_LockSurface(real_surface);
+
+    int pixel, npixels;
+
+#if LCD_DEPTH != 1
+#error "Split screen only works for monochrome displays !"
+#endif
+
+    npixels = display_zoom * display_zoom * UI_LCD_SPLIT_LINES * surface->pitch;
+    const unsigned char * pixels_src = (const unsigned char*)surface->pixels;
+    unsigned char * pixels_dst = (unsigned char*)real_surface->pixels;
+    const int start_pixel = UI_LCD_SPLIT_LINES * surface->pitch * display_zoom;
+    const int stop_pixel = (UI_LCD_SPLIT_LINES+UI_LCD_SPLIT_BLACK_LINES)
+        * surface->pitch * display_zoom;
+
+    /* draw top pixels, change the color */
+    for (pixel = 0; pixel < npixels ; pixel++)
+    {
+        int pix = pixels_src[pixel] + gradient_steps;
+        if(pix > 255) pix = 255;
+
+        pixels_dst[pixel] = pix;
+    }
+
+    /* copy bottom pixels */
+    memcpy(&pixels_dst[stop_pixel], &pixels_src[start_pixel],
+          (UI_LCD_HEIGHT - UI_LCD_SPLIT_LINES) * surface->pitch * display_zoom);
+
+    /* separation lines are off */
+    for (pixel = start_pixel; pixel < stop_pixel ; pixel++)
+        pixels_dst[pixel] = 0;
+
+    SDL_UnlockSurface(surface);
+    SDL_UnlockSurface(real_surface);
+
+    SDL_BlitSurface(real_surface, &src, gui_surface, &dest);
+#else
     SDL_BlitSurface(surface, &src, gui_surface, &dest);
+#endif
+
     SDL_Flip(gui_surface);
 }
 
 /* set a range of bitmap indices to a gradient from startcolour to endcolour */
 void sdl_set_gradient(SDL_Surface *surface, SDL_Color *start, SDL_Color *end,
-                      int first, int steps)
+                      IFSPLIT(SDL_Color *split_start,)
+                      IFSPLIT(SDL_Color *split_end ,) int first, int steps)
 {
     int i;
-    SDL_Color palette[steps];
+
+#ifdef UI_LCD_SPLIT
+    int tot_steps = steps * 2;
+    if (tot_steps > 256)
+        tot_steps = 256;
+
+    gradient_steps = steps;
+#else
+#define tot_steps steps
+#endif
+
+    SDL_Color palette[tot_steps];
 
     for (i = 0; i < steps; i++) {
         palette[i].r = start->r + (end->r - start->r) * i / (steps - 1);
@@ -93,6 +155,14 @@ void sdl_set_gradient(SDL_Surface *surface, SDL_Color *start, SDL_Color *end,
         palette[i].b = start->b + (end->b - start->b) * i / (steps - 1);
     }
 
-    SDL_SetPalette(surface, SDL_LOGPAL|SDL_PHYSPAL, palette, first, steps);
+#ifdef UI_LCD_SPLIT /* extra color */
+    for (i = steps ; i < tot_steps; i++) {
+        palette[i].r = split_start->r + (split_end->r - split_start->r) * (i - steps) / (tot_steps - steps - 1);
+        palette[i].g = split_start->g + (split_end->g - split_start->g) * (i - steps) / (tot_steps - steps - 1);
+        palette[i].b = split_start->b + (split_end->b - split_start->b) * (i - steps) / (tot_steps - steps - 1);
+    }
+#endif
+
+    SDL_SetPalette(surface, SDL_LOGPAL|SDL_PHYSPAL, palette, first, tot_steps);
 }