From 3c43503283f5322999bb52f28762d88a0413885e Mon Sep 17 00:00:00 2001
From: Thomas Martitz <kugel@rockbox.org>
Date: Mon, 27 Dec 2010 22:08:34 +0000
Subject: Vastly increase speed of SDL screen updates for RGB565.

Flyspray: FS#11834 (with minor changes by me).
Author: Thomas Jarosch

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28914 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/hosted/sdl/lcd-sdl.c    | 39 ++++++++++++++++++++++++++++-----
 firmware/target/hosted/sdl/system-sdl.c | 10 ++++++---
 2 files changed, 40 insertions(+), 9 deletions(-)

(limited to 'firmware/target/hosted/sdl')

diff --git a/firmware/target/hosted/sdl/lcd-sdl.c b/firmware/target/hosted/sdl/lcd-sdl.c
index 96b1a04aa6..5559369e0e 100644
--- a/firmware/target/hosted/sdl/lcd-sdl.c
+++ b/firmware/target/hosted/sdl/lcd-sdl.c
@@ -30,10 +30,40 @@ 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))
 {
+    SDL_Rect dest;
+#if LCD_DEPTH >= 8 && (LCD_PIXELFORMAT == RGB565) \
+    && !defined(LCD_STRIDEFORMAT) && !defined(HAVE_LCD_SPLIT)
+    SDL_Rect src;
+    (void)max_x;
+    (void)max_y;
+    (void)getpixel;
+    /* Update complete screen via one blit operation (fast) */
+    SDL_Surface *lcd = SDL_CreateRGBSurfaceFrom(lcd_framebuffer, LCD_FBWIDTH,
+                                                LCD_FBHEIGHT, LCD_DEPTH,
+                                                LCD_FBWIDTH * LCD_DEPTH/8,
+                                                0, 0, 0, 0);
+    src.x = x_start;
+    src.y = y_start;
+    src.w = width;
+    src.h = height;
+
+    if (display_zoom == 1) {
+        dest = src;
+        SDL_BlitSurface(lcd, &src, surface, &dest);
+    } else {
+        /* Note: SDL_SoftStretch is currently marked as DO NOT USE
+           but there are no real alternatives for efficent zooming. */
+        dest.x = src.x * display_zoom;
+        dest.y = src.y * display_zoom;
+        dest.w = src.w * display_zoom;
+        dest.h = src.h * display_zoom;
+        SDL_SoftStretch(lcd, &src, surface, &dest);
+    }
+    SDL_FreeSurface(lcd);
+#else
     int x, y;
     int xmax, ymax;
-    SDL_Rect dest;
-
+    /* Very slow pixel-by-pixel drawing */
     ymax = y_start + height;
     xmax = x_start + width;
 
@@ -42,8 +72,6 @@ void sdl_update_rect(SDL_Surface *surface, int x_start, int y_start, int width,
     if(ymax >= max_y)
         ymax = max_y;
 
-    SDL_LockSurface(surface);
-
     dest.w = display_zoom;
     dest.h = display_zoom;
 
@@ -69,8 +97,7 @@ void sdl_update_rect(SDL_Surface *surface, int x_start, int y_start, int width,
         }
 #endif
     }
-
-    SDL_UnlockSurface(surface);
+#endif
 }
 
 void sdl_gui_update(SDL_Surface *surface, int x_start, int y_start, int width,
diff --git a/firmware/target/hosted/sdl/system-sdl.c b/firmware/target/hosted/sdl/system-sdl.c
index 6937c373e3..b900d38b43 100644
--- a/firmware/target/hosted/sdl/system-sdl.c
+++ b/firmware/target/hosted/sdl/system-sdl.c
@@ -84,6 +84,7 @@ static int sdl_event_thread(void * param)
 
     SDL_Surface *picture_surface = NULL;
     int width, height;
+    int depth;
 
     /* Try and load the background image. If it fails go without */
     if (background) {
@@ -115,9 +116,12 @@ static int sdl_event_thread(void * param)
             height = SIM_LCD_HEIGHT;
         }
     }
-   
-    
-    if ((gui_surface = SDL_SetVideoMode(width * display_zoom, height * display_zoom, 24, SDL_HWSURFACE|SDL_DOUBLEBUF)) == NULL) {
+
+    depth = LCD_DEPTH;
+    if (depth < 8)
+        depth = 16;
+
+    if ((gui_surface = SDL_SetVideoMode(width * display_zoom, height * display_zoom, depth, SDL_HWSURFACE|SDL_DOUBLEBUF)) == NULL) {
         panicf("%s", SDL_GetError());
     }
 
-- 
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