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Vastly increase speed of SDL screen updates for RGB565.

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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
This commit is contained in:
Thomas Martitz 2010-12-27 22:08:34 +00:00
parent 0bf1bd1d51
commit 3c43503283
3 changed files with 41 additions and 9 deletions
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39
firmware/target/hosted/sdl/lcd-sdl.c
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@ -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,