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desmume
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This experimental patch avoids an intermediate step in sdl for rgb555 to rgb conversion. In my limited testing this gives me a couple more fps, possibly because of 1 less allocation and memcpy.

This commit is contained in:
riccardom 2009-01-04 14:24:42 +00:00
parent 6eb058bba3
commit 9db45c8477
1 changed files with 15 additions and 25 deletions
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40
desmume/src/gtk/main.cpp
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@ -66,6 +66,7 @@
static const char *bad_glob_cflash_disk_image_file;
#define SCREENS_PIXEL_SIZE 98304
#define FPS_LIMITER_FRAME_PERIOD 8
static SDL_sem *fps_limiter_semaphore;
@ -816,30 +817,21 @@ common_configure_fn( GtkWidget *widget,
/* Drawing callback */
static int gtkFloatExposeEvent (GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
SDL_PixelFormat screenPixFormat;
SDL_Surface *rawImage, *screenImage;
guchar *rgb;
rgb = (u8 *) malloc(SCREENS_PIXEL_SIZE*3);
if (!rgb)
return 0;
for (int i = 0; i < SCREENS_PIXEL_SIZE; i++) {
rgb[(i * 3) + 0] = ((*((u16 *)&GPU_screen[(i<<1)]) >> 0) & 0x1f) << 3;
rgb[(i * 3) + 1] = ((*((u16 *)&GPU_screen[(i<<1)]) >> 5) & 0x1f) << 3;
rgb[(i * 3) + 2] = ((*((u16 *)&GPU_screen[(i<<1)]) >> 10) & 0x1f) << 3;
}
rawImage = SDL_CreateRGBSurfaceFrom((void*)&GPU_screen, 256, 192*2, 16, 512, 0x001F, 0x03E0, 0x7C00, 0);
if(rawImage == NULL) return 1;
memcpy(&screenPixFormat, rawImage->format, sizeof(SDL_PixelFormat));
screenPixFormat.BitsPerPixel = 24;
screenPixFormat.BytesPerPixel = 3;
screenPixFormat.Rshift = 0;
screenPixFormat.Gshift = 8;
screenPixFormat.Bshift = 16;
screenPixFormat.Rmask = 0x0000FF;
screenPixFormat.Gmask = 0x00FF00;
screenPixFormat.Bmask = 0xFF0000;
screenImage = SDL_ConvertSurface(rawImage, &screenPixFormat, 0);
gdk_draw_rgb_image (widget->window,
widget->style->fg_gc[widget->state],0,0,screenImage->w, screenImage->h,
GDK_RGB_DITHER_NONE,(guchar*)screenImage->pixels,screenImage->pitch);
SDL_FreeSurface(screenImage);
SDL_FreeSurface(rawImage);
gdk_draw_rgb_image (widget->window,
widget->style->fg_gc[widget->state], 0, 0,
256, 192*2,
GDK_RGB_DITHER_NONE,
rgb, 256*3);
return 1;
}
@ -1103,8 +1095,6 @@ static void Modify_Layer(GtkWidget* widget, gpointer data)
/////////////////////////////// PRINTSCREEN /////////////////////////////////
#define SCREENS_PIXEL_SIZE 98304
static void Printscreen()
{
GdkPixbuf *screenshot;