Sansa Clip Simulator: emulate the real screen at the price of some CPU (FS#9521)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19347 a1c6a512-1295-4272-9138-f99709370657

5 files changed, 179 insertions, 33 deletions

diff --git a/uisimulator/sdl/lcd-bitmap.c b/uisimulator/sdl/lcd-bitmap.c
index 92480396bc..b9f5732dc7 100644
--- a/uisimulator/sdl/lcd-bitmap.c
+++ b/uisimulator/sdl/lcd-bitmap.c
@@ -24,15 +24,24 @@
 #include "lcd-sdl.h"
 
 SDL_Surface* lcd_surface;
+#ifdef UI_LCD_SPLIT
+SDL_Surface* lcd_real_surface; /* the surface which represents the real screen */
+#endif
 int lcd_backlight_val;
 
 #if LCD_DEPTH <= 8
 #ifdef HAVE_BACKLIGHT
 SDL_Color lcd_backlight_color_zero = {UI_LCD_BGCOLORLIGHT, 0};
 SDL_Color lcd_backlight_color_max  = {UI_LCD_FGCOLORLIGHT, 0};
+#ifdef UI_LCD_SPLIT
+SDL_Color lcd_backlight_color_split= {UI_LCD_SPLIT_FGCOLORLIGHT, 0};
+#endif
 #endif
 SDL_Color lcd_color_zero = {UI_LCD_BGCOLOR, 0};
 SDL_Color lcd_color_max  = {UI_LCD_FGCOLOR, 0};
+#ifdef UI_LCD_SPLIT
+SDL_Color lcd_color_split= {UI_LCD_SPLIT_FGCOLOR, 0};
+#endif
 #endif
 
 #if LCD_DEPTH < 8
@@ -73,8 +82,9 @@ void lcd_update_rect(int x_start, int y_start, int width, int height)
 {
     sdl_update_rect(lcd_surface, x_start, y_start, width, height, LCD_WIDTH,
                     LCD_HEIGHT, get_lcd_pixel);
-    sdl_gui_update(lcd_surface, x_start, y_start, width, height, LCD_WIDTH,
-                   LCD_HEIGHT, background ? UI_LCD_POSX : 0, background? UI_LCD_POSY : 0);
+    sdl_gui_update(lcd_surface, IFSPLIT(lcd_real_surface,) x_start, y_start,
+                   width, height, LCD_WIDTH, LCD_HEIGHT,
+                   background ? UI_LCD_POSX : 0, background? UI_LCD_POSY : 0);
 }
 
 #ifdef HAVE_BACKLIGHT
@@ -84,27 +94,51 @@ void sim_backlight(int value)
 
 #if LCD_DEPTH <= 8
     if (value > 0) {
+#ifdef UI_LCD_SPLIT
+        sdl_set_gradient(lcd_real_surface, &lcd_backlight_color_zero,
+                &lcd_backlight_color_max, &lcd_backlight_color_zero,
+                &lcd_backlight_color_split, 0, (1<<LCD_DEPTH));
+#else
         sdl_set_gradient(lcd_surface, &lcd_backlight_color_zero,
-                         &lcd_backlight_color_max, 0, (1<<LCD_DEPTH));
+                &lcd_backlight_color_max, 0, (1<<LCD_DEPTH));
+#endif
     } else {
-        sdl_set_gradient(lcd_surface, &lcd_color_zero, &lcd_color_max,
-                         0, (1<<LCD_DEPTH));
+#ifdef UI_LCD_SPLIT
+        sdl_set_gradient(lcd_real_surface, &lcd_color_zero, &lcd_color_max,
+                &lcd_color_zero, &lcd_color_split, 0, (1<<LCD_DEPTH));
+#else
+        sdl_set_gradient(lcd_surface, &lcd_color_zero, &lcd_color_max, 0,
+                (1<<LCD_DEPTH));
+#endif
     }
 #if LCD_DEPTH < 8
     if (lcd_ex_shades) {
         if (value > 0) {
+#ifdef UI_LCD_SPLIT
+            sdl_set_gradient(lcd_real_surface, &lcd_backlight_color_max,
+                    &lcd_backlight_color_zero, &lcd_backlight_color_split,
+                    &lcd_backlight_color_zero,
+                    (1<<LCD_DEPTH), lcd_ex_shades);
+#else
             sdl_set_gradient(lcd_surface, &lcd_backlight_color_max,
-                             &lcd_backlight_color_zero, (1<<LCD_DEPTH),
-                             lcd_ex_shades);
+                    &lcd_backlight_color_zero, (1<<LCD_DEPTH), lcd_ex_shades);
+#endif
         } else {
+#ifdef UI_LCD_SPLIT
+            sdl_set_gradient(lcd_real_surface, &lcd_color_max, &lcd_color_zero,
+                    &lcd_color_split, &lcd_color_zero, (1<<LCD_DEPTH),
+                    lcd_ex_shades);
+#else
             sdl_set_gradient(lcd_surface, &lcd_color_max, &lcd_color_zero,
-                             (1<<LCD_DEPTH), lcd_ex_shades);
+                    (1<<LCD_DEPTH), lcd_ex_shades);
+#endif
         }
     }
 #endif
 
-    sdl_gui_update(lcd_surface, 0, 0, LCD_WIDTH, LCD_HEIGHT, LCD_WIDTH,
-                   LCD_HEIGHT, background ? UI_LCD_POSX : 0, background? UI_LCD_POSY : 0);
+    sdl_gui_update(lcd_surface, IFSPLIT(lcd_real_surface,) 0, 0, LCD_WIDTH,
+                   LCD_HEIGHT, LCD_WIDTH, LCD_HEIGHT,
+                   background ? UI_LCD_POSX : 0, background? UI_LCD_POSY : 0);
 
 #endif
 }
@@ -119,15 +153,26 @@ void sim_lcd_init(void)
 #else
     lcd_surface = SDL_CreateRGBSurface(SDL_SWSURFACE, LCD_WIDTH * display_zoom,
         LCD_HEIGHT * display_zoom, 8, 0, 0, 0, 0);
+#ifdef UI_LCD_SPLIT
+    lcd_real_surface = SDL_CreateRGBSurface(SDL_SWSURFACE,
+        LCD_WIDTH * display_zoom,
+        (LCD_HEIGHT+UI_LCD_SPLIT_BLACK_LINES) * display_zoom, 8, 0, 0, 0, 0);
+#endif
 #endif
 
 #if LCD_DEPTH <= 8
 #ifdef HAVE_BACKLIGHT
-    sdl_set_gradient(lcd_surface, &lcd_backlight_color_zero, &lcd_color_max,
-                     0, (1<<LCD_DEPTH));
+#ifdef UI_LCD_SPLIT
+    sdl_set_gradient(lcd_real_surface, &lcd_backlight_color_zero,
+            &lcd_color_max, &lcd_backlight_color_zero,
+            &lcd_color_split, 0, (1<<LCD_DEPTH));
+#else
+    sdl_set_gradient(lcd_surface, &lcd_backlight_color_zero, &lcd_color_max, 0,
+            (1<<LCD_DEPTH));
+#endif
 #else
-    sdl_set_gradient(lcd_surface, &lcd_color_zero, &lcd_color_max, 0, 
-                     (1<<LCD_DEPTH));
+    sdl_set_gradient(lcd_surface, &lcd_color_zero, &lcd_color_max, 0,
+                (1<<LCD_DEPTH));
 #endif
 #endif
 }
@@ -140,15 +185,25 @@ void sim_lcd_ex_init(int shades, unsigned long (*getpixel)(int, int))
     if (shades) {
 #ifdef HAVE_BACKLIGHT
         if (lcd_backlight_val > 0) {
+#ifdef UI_LCD_SPLIT
+            sdl_set_gradient(lcd_real_surface, &lcd_color_max,
+                    &lcd_backlight_color_zero, &lcd_color_split,
+                    &lcd_backlight_color_zero, (1<<LCD_DEPTH), shades);
+#else
             sdl_set_gradient(lcd_surface, &lcd_color_max,
-                             &lcd_backlight_color_zero, (1<<LCD_DEPTH),
-                             shades);
+                    &lcd_backlight_color_zero, (1<<LCD_DEPTH), shades);
+#endif
         }
-        else 
+        else
 #endif
         {
+#ifdef UI_LCD_SPLIT
+            sdl_set_gradient(lcd_real_surface, &lcd_color_max, &lcd_color_zero,
+                    &lcd_color_split, &lcd_color_zero, (1<<LCD_DEPTH), shades);
+#else
             sdl_set_gradient(lcd_surface, &lcd_color_max, &lcd_color_zero,
-                             (1<<LCD_DEPTH), shades);
+                    (1<<LCD_DEPTH), shades);
+#endif
         }
     }
 }
@@ -158,8 +213,9 @@ void sim_lcd_ex_update_rect(int x_start, int y_start, int width, int height)
     if (lcd_ex_getpixel) {
         sdl_update_rect(lcd_surface, x_start, y_start, width, height,
                         LCD_WIDTH, LCD_HEIGHT, lcd_ex_getpixel);
-        sdl_gui_update(lcd_surface, x_start, y_start, width, height, LCD_WIDTH,
-                       LCD_HEIGHT, background ? UI_LCD_POSX : 0,
+        sdl_gui_update(lcd_surface, IFSPLIT(lcd_real_surface,) x_start, y_start,
+                       width, height, LCD_WIDTH, LCD_HEIGHT,
+                       background ? UI_LCD_POSX : 0,
                        background? UI_LCD_POSY : 0);
     }
 }
@@ -256,7 +312,7 @@ void lcd_blit_yuv(unsigned char * const src[3],
             *dst = LCD_RGBPACK_LCD(r >> 9, g >> 8, b >> 9);
 
 #if LCD_WIDTH >= LCD_HEIGHT
-            dst++;            
+            dst++;
 #else
             dst += LCD_WIDTH;
 #endif
@@ -276,7 +332,7 @@ void lcd_blit_yuv(unsigned char * const src[3],
             *dst = LCD_RGBPACK_LCD(r >> 9, g >> 8, b >> 9);
 
 #if LCD_WIDTH >= LCD_HEIGHT
-            dst++;            
+            dst++;
 #else
             dst += LCD_WIDTH;
 #endif
@@ -321,7 +377,7 @@ void lcd_blit_yuv(unsigned char * const src[3],
             *dst = LCD_RGBPACK_LCD(r >> 9, g >> 8, b >> 9);
 
 #if LCD_WIDTH >= LCD_HEIGHT
-            dst++;            
+            dst++;
 #else
             dst += LCD_WIDTH;
 #endif
@@ -341,7 +397,7 @@ void lcd_blit_yuv(unsigned char * const src[3],
             *dst = LCD_RGBPACK_LCD(r >> 9, g >> 8, b >> 9);
 
 #if LCD_WIDTH >= LCD_HEIGHT
-            dst++;            
+            dst++;
 #else
             dst += LCD_WIDTH;
 #endif
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);
 }
 
diff --git a/uisimulator/sdl/lcd-sdl.h b/uisimulator/sdl/lcd-sdl.h
index 9ffa5246cf..b177eb14c9 100644
--- a/uisimulator/sdl/lcd-sdl.h
+++ b/uisimulator/sdl/lcd-sdl.h
@@ -25,6 +25,13 @@
 #include "lcd.h"
 #include "SDL.h"
 
+#include "uisdl.h"
+#ifdef UI_LCD_SPLIT
+#define IFSPLIT(x,y) x,y
+#else
+#define IFSPLIT(x,y)
+#endif
+
 /* Default display zoom level */
 extern int display_zoom;
 
@@ -32,11 +39,13 @@ void sdl_update_rect(SDL_Surface *surface, int x_start, int y_start, int width,
                      int height, int max_x, int max_y,
                      unsigned long (*getpixel)(int, int));
 
-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);
 
 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);
 
 #endif /* #ifndef __LCDSDL_H__ */
 
diff --git a/uisimulator/sdl/uisdl.c b/uisimulator/sdl/uisdl.c
index 156e4203f6..f161d40567 100644
--- a/uisimulator/sdl/uisdl.c
+++ b/uisimulator/sdl/uisdl.c
@@ -134,7 +134,11 @@ bool gui_startup(void)
         height = UI_LCD_HEIGHT + UI_REMOTE_HEIGHT;
 #else
         width = UI_LCD_WIDTH;
-        height = UI_LCD_HEIGHT;
+        height = UI_LCD_HEIGHT
+#ifdef UI_LCD_SPLIT
+            + UI_LCD_SPLIT_BLACK_LINES
+#endif
+            ;
 #endif
     }
    
diff --git a/uisimulator/sdl/uisdl.h b/uisimulator/sdl/uisdl.h
index 0a97df56fa..cb4158500c 100644
--- a/uisimulator/sdl/uisdl.h
+++ b/uisimulator/sdl/uisdl.h
@@ -459,6 +459,13 @@
 #define UI_LCD_FGCOLOR              0, 0, 0 /* foreground color of LCD (no backlight) */
 #define UI_LCD_FGCOLORLIGHT         13, 226, 229 /* foreground color of LCD (backlight) */
 
+#define UI_LCD_SPLIT                /* The screen is split in 2 areas */
+#define UI_LCD_SPLIT_LINES          16 /* the top 16 lines have a different color */
+#define UI_LCD_SPLIT_BLACK_LINES    2  /* The 2 areas are separated by 2 empty lines */
+/* Colors for the top part of the screen */
+#define UI_LCD_SPLIT_FGCOLOR        0, 0, 0 /* foreground color of LCD (no backlight) */
+#define UI_LCD_SPLIT_FGCOLORLIGHT   255, 230, 15 /* foreground color of LCD (backlight) */
+
 #endif
 extern SDL_Surface *gui_surface;
 extern bool background;  /* True if the background image is enabled */