Modified SDL-1.2.13 so it works with Daphne (and Vista!)

git-svn-id: https://www.daphne-emu.com:9443/daphnesvn/branches/v_1_0@3019 c98d566b-fa28-4d4c-8a7b-932307ef5c1a

src/sdl_mods/sdl-1.2.13/SDL_yuv.c

@@ -0,0 +1,180 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2006 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    [email protected]
+*/
+#include "SDL_config.h"
+
+/* This is the implementation of the YUV video surface support */
+
+#include "SDL_video.h"
+#include "SDL_sysvideo.h"
+#include "SDL_yuvfuncs.h"
+#include "SDL_yuv_sw_c.h"
+
+unsigned int IsVistaOrNewer()
+{
+	unsigned int uRes = 0;
+
+	OSVERSIONINFOEX osvi;
+
+	ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
+	osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
+
+	// if function succeeds
+	if (GetVersionEx((OSVERSIONINFO *) &osvi))
+	{
+		if (osvi.dwMajorVersion >= 6)
+		{
+			uRes = 1;
+		}
+	}
+
+	return uRes;
+}
+
+SDL_Overlay *SDL_CreateYUVOverlay(int w, int h, Uint32 format,
+                                  SDL_Surface *display)
+{
+	SDL_VideoDevice *video = current_video;
+	SDL_VideoDevice *this  = current_video;
+	const char *yuv_hwaccel;
+	SDL_Overlay *overlay;
+
+	if ( (display->flags & SDL_OPENGL) == SDL_OPENGL ) {
+		SDL_SetError("YUV overlays are not supported in OpenGL mode");
+		return NULL;
+	}
+
+	/* Display directly on video surface, if possible */
+	if ( SDL_getenv("SDL_VIDEO_YUV_DIRECT") ) {
+		if ( (display == SDL_PublicSurface) &&
+		     ((SDL_VideoSurface->format->BytesPerPixel == 2) ||
+		      (SDL_VideoSurface->format->BytesPerPixel == 4)) ) {
+			display = SDL_VideoSurface;
+		}
+	}
+	overlay = NULL;
+
+	// start MPO
+
+	// YUV HW overlays are broken on Vista and newer, so only create them if this our OS is older than Vista.
+	if (!IsVistaOrNewer())
+	{
+		yuv_hwaccel = SDL_getenv("SDL_VIDEO_YUV_HWACCEL");
+		if ( ((display == SDL_VideoSurface) && video->CreateYUVOverlay) &&
+			(!yuv_hwaccel || (SDL_atoi(yuv_hwaccel) > 0)) )
+		{
+			overlay = video->CreateYUVOverlay(this, w, h, format, display);
+		}
+	}
+	// end MPO
+
+	/* If hardware YUV overlay failed ... */
+	if ( overlay == NULL ) {
+		overlay = SDL_CreateYUV_SW(this, w, h, format, display);
+	}
+	return overlay;
+}
+
+int SDL_LockYUVOverlay(SDL_Overlay *overlay)
+{
+	if ( overlay == NULL ) {
+		SDL_SetError("Passed NULL overlay");
+		return -1;
+	}
+	return overlay->hwfuncs->Lock(current_video, overlay);
+}
+
+void SDL_UnlockYUVOverlay(SDL_Overlay *overlay)
+{
+	if ( overlay == NULL ) {
+		return;
+	}
+	overlay->hwfuncs->Unlock(current_video, overlay);
+}
+
+int SDL_DisplayYUVOverlay(SDL_Overlay *overlay, SDL_Rect *dstrect)
+{
+	SDL_Rect src, dst;
+	int srcx, srcy, srcw, srch;
+	int dstx, dsty, dstw, dsth;
+
+	if ( overlay == NULL || dstrect == NULL ) {
+		SDL_SetError("Passed NULL overlay or dstrect");
+		return -1;
+	}
+
+	/* Clip the rectangle to the screen area */
+	srcx = 0;
+	srcy = 0;
+	srcw = overlay->w;
+	srch = overlay->h;
+	dstx = dstrect->x;
+	dsty = dstrect->y;
+	dstw = dstrect->w;
+	dsth = dstrect->h;
+	if ( dstx < 0 ) {
+		srcw += (dstx * overlay->w) / dstrect->w;
+		dstw += dstx;
+		srcx -= (dstx * overlay->w) / dstrect->w;
+		dstx = 0;
+	}
+	if ( (dstx+dstw) > current_video->screen->w ) {
+		int extra = (dstx+dstw - current_video->screen->w);
+		srcw -= (extra * overlay->w) / dstrect->w;
+		dstw -= extra;
+	}
+	if ( dsty < 0 ) {
+		srch += (dsty * overlay->h) / dstrect->h;
+		dsth += dsty;
+		srcy -= (dsty * overlay->h) / dstrect->h;
+		dsty = 0;
+	}
+	if ( (dsty+dsth) > current_video->screen->h ) {
+		int extra = (dsty+dsth - current_video->screen->h);
+		srch -= (extra * overlay->h) / dstrect->h;
+		dsth -= extra;
+	}
+	if ( srcw <= 0 || srch <= 0 ||
+	     srch <= 0 || dsth <= 0 ) {
+		return 0;
+	}
+	/* Ugh, I can't wait for SDL_Rect to be int values */
+	src.x = srcx;
+	src.y = srcy;
+	src.w = srcw;
+	src.h = srch;
+	dst.x = dstx;
+	dst.y = dsty;
+	dst.w = dstw;
+	dst.h = dsth;
+	return overlay->hwfuncs->Display(current_video, overlay, &src, &dst);
+}
+
+void SDL_FreeYUVOverlay(SDL_Overlay *overlay)
+{
+	if ( overlay == NULL ) {
+		return;
+	}
+	if ( overlay->hwfuncs ) {
+		overlay->hwfuncs->FreeHW(current_video, overlay);
+	}
+	SDL_free(overlay);
+}