view src/video/bwindow/SDL_sysyuv.cc @ 1643:51038e80ae59

More general fix for bug #189 The clipping is done at a higher level, and the low level functions are passed clipped rectangles. Drivers which don't support source clipping have not been changed, so the image will be squished instead of clipped, but at least they will no longer crash when the destination rect was out of bounds.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 17 Apr 2006 06:47:23 +0000
parents 376665398b25
children 782fd950bd46 c121d94672cb 2b5c30359c1d
line wrap: on
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/*
    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
    slouken@libsdl.org
*/
#include "SDL_config.h"

/* This is the BeOS version of SDL YUV video overlays */

#include "SDL_video.h"
#include "SDL_sysyuv.h"
#include "../SDL_yuvfuncs.h"

extern "C" {

/* The functions used to manipulate software video overlays */
static struct private_yuvhwfuncs be_yuvfuncs =
{
    BE_LockYUVOverlay,
    BE_UnlockYUVOverlay,
    BE_DisplayYUVOverlay,
    BE_FreeYUVOverlay
};

BBitmap * BE_GetOverlayBitmap(BRect bounds, color_space cs) {
	BBitmap *bbitmap;
	bbitmap = new BBitmap(bounds,B_BITMAP_WILL_OVERLAY,cs);
	if (!bbitmap || bbitmap->InitCheck() != B_OK) {
		delete bbitmap;
		return 0;
	}
	overlay_restrictions r;
	bbitmap->GetOverlayRestrictions(&r);
	uint32 width = bounds.IntegerWidth() + 1;
	uint32 height = bounds.IntegerHeight() + 1;
	uint32 width_padding = 0;
	uint32 height_padding = 0;
	if ((r.source.horizontal_alignment != 0) ||
	    (r.source.vertical_alignment != 0)) {
		delete bbitmap;
		return 0;
	}
	if (r.source.width_alignment != 0) {
		uint32 aligned_width = r.source.width_alignment + 1;
		if (width % aligned_width > 0) {
			width_padding = aligned_width - width % aligned_width;
		}
	}
	if (r.source.height_alignment != 0) {
		uint32 aligned_height = r.source.height_alignment + 1;
		if (height % aligned_height > 0) {
			fprintf(stderr,"GetOverlayBitmap failed height alignment\n");
			fprintf(stderr,"- height = %lu, aligned_height = %lu\n",height,aligned_height);
			delete bbitmap;
			return 0;
		}
	}
	if ((r.source.min_width > width) ||
	    (r.source.min_height > height) ||
	    (r.source.max_width < width) ||
	    (r.source.max_height < height)) {
		fprintf(stderr,"GetOverlayBitmap failed bounds tests\n");
	    delete bbitmap;
	    return 0;
	}
	if ((width_padding != 0) || (height_padding != 0)) {
		delete bbitmap;
		bounds.Set(bounds.left,bounds.top,bounds.right+width_padding,bounds.bottom+height_padding);
		bbitmap = new BBitmap(bounds,B_BITMAP_WILL_OVERLAY,cs);
		if (!bbitmap || bbitmap->InitCheck() != B_OK) {
			fprintf(stderr,"GetOverlayBitmap failed late\n");
			delete bbitmap;
			return 0;
		}
	}		
	return bbitmap;	    
}

// See <GraphicsDefs.h> [btw: Cb=U, Cr=V]
// See also http://www.fourcc.org/indexyuv.htm
enum color_space convert_color_space(Uint32 format) {
	switch (format) {
	case SDL_YV12_OVERLAY:
		return B_YUV9;
	case SDL_IYUV_OVERLAY:
		return B_YUV12;
	case SDL_YUY2_OVERLAY:
		return B_YCbCr422;
	case SDL_UYVY_OVERLAY:
		return B_YUV422;
	case SDL_YVYU_OVERLAY: // not supported on beos?
		return B_NO_COLOR_SPACE;
	default:
		return B_NO_COLOR_SPACE;
	}
}

// See SDL_video.h
int count_planes(Uint32 format) {
	switch (format) {
	case SDL_YV12_OVERLAY:
	case SDL_IYUV_OVERLAY:
		return 3;
	case SDL_YUY2_OVERLAY:
	case SDL_UYVY_OVERLAY:
	case SDL_YVYU_OVERLAY:
		return 1;
	default:
		return 0;
	}
}		

SDL_Overlay *BE_CreateYUVOverlay(_THIS, int width, int height, Uint32 format, SDL_Surface *display) {
	SDL_Overlay* overlay;
	struct private_yuvhwdata* hwdata;
	BBitmap *bbitmap;
	int planes;
	BRect bounds;
	color_space cs;
	
	/* find the appropriate BeOS colorspace descriptor */
	cs = convert_color_space(format);
	if (cs == B_NO_COLOR_SPACE)
	{
		return NULL;
	}
	
	/* count planes */
	planes = count_planes(format);
	if (planes == 0)
	{
		return NULL;
	}
	/* TODO: figure out planar modes, if anyone cares */
	if (planes == 3)
	{
		return NULL;
	}

    /* Create the overlay structure */
    overlay = (SDL_Overlay*)SDL_calloc(1, sizeof(SDL_Overlay));

    if (overlay == NULL)
    {
        SDL_OutOfMemory();
        return NULL;
    }

    /* Fill in the basic members */
    overlay->format = format;
    overlay->w = width;
    overlay->h = height;
    overlay->hwdata = NULL;
	
    /* Set up the YUV surface function structure */
    overlay->hwfuncs = &be_yuvfuncs;

    /* Create the pixel data and lookup tables */
    hwdata = (struct private_yuvhwdata*)SDL_calloc(1, sizeof(struct private_yuvhwdata));

    if (hwdata == NULL)
    {
        SDL_OutOfMemory();
        SDL_FreeYUVOverlay(overlay);
        return NULL;
    }

    overlay->hwdata = hwdata;
	overlay->hwdata->display = display;
	overlay->hwdata->bview = NULL;
	overlay->hwdata->bbitmap = NULL;
	overlay->hwdata->locked = 0;

	/* Create the BBitmap framebuffer */
	bounds.top = 0;	bounds.left = 0;
	bounds.right = width-1;
	bounds.bottom = height-1;
	
	BView * bview = new BView(bounds,"overlay",B_FOLLOW_NONE,B_WILL_DRAW); 
	if (!bview) {
		SDL_OutOfMemory();
        SDL_FreeYUVOverlay(overlay);
        return NULL;
	}
	overlay->hwdata->bview = bview;
	overlay->hwdata->first_display = true;
	bview->Hide();
	
	bbitmap = BE_GetOverlayBitmap(bounds,cs);
	if (!bbitmap) {
		overlay->hwdata->bbitmap = NULL;
		SDL_FreeYUVOverlay(overlay);
		return NULL;
	}
	overlay->hwdata->bbitmap = bbitmap;
	
	overlay->planes = planes;
	overlay->pitches = (Uint16*)SDL_calloc(overlay->planes, sizeof(Uint16));
	overlay->pixels  = (Uint8**)SDL_calloc(overlay->planes, sizeof(Uint8*));
	if (!overlay->pitches || !overlay->pixels)
	{
        SDL_OutOfMemory();
        SDL_FreeYUVOverlay(overlay);
        return(NULL);
    }

   	overlay->pitches[0] = bbitmap->BytesPerRow();
   	overlay->pixels[0]  = (Uint8 *)bbitmap->Bits();
	overlay->hw_overlay = 1;
	
	if (SDL_Win->LockWithTimeout(1000000) != B_OK) {
        SDL_FreeYUVOverlay(overlay);
        return(NULL);
    }
	BView * view = SDL_Win->View();
    view->AddChild(bview);
    rgb_color key;
    bview->SetViewOverlay(bbitmap,bounds,bview->Bounds(),&key,B_FOLLOW_ALL,
                         B_OVERLAY_FILTER_HORIZONTAL|B_OVERLAY_FILTER_VERTICAL);
    bview->SetViewColor(key);
    bview->Flush();
	SDL_Win->Unlock();
	
	current_overlay=overlay;
        
	return overlay;
}

int BE_LockYUVOverlay(_THIS, SDL_Overlay* overlay)
{
    if (overlay == NULL)
    {
        return 0;
    }

    overlay->hwdata->locked = 1;
    return 0;
}

void BE_UnlockYUVOverlay(_THIS, SDL_Overlay* overlay)
{
    if (overlay == NULL)
    {
         return;
    }

    overlay->hwdata->locked = 0;
}

int BE_DisplayYUVOverlay(_THIS, SDL_Overlay* overlay, SDL_Rect* src, SDL_Rect *dst)
{
    if ((overlay == NULL) || (overlay->hwdata==NULL)
        || (overlay->hwdata->bview==NULL) || (SDL_Win->View() == NULL))
    {
        return -1;
    }
    if (SDL_Win->LockWithTimeout(50000) != B_OK) {
        return 0;
    }
    BView * bview = overlay->hwdata->bview;
    if (SDL_Win->IsFullScreen()) {
    	int left,top;
    	SDL_Win->GetXYOffset(left,top);
	    bview->MoveTo(left+dst->x,top+dst->y);
    } else {
	    bview->MoveTo(dst->x,dst->y);
    }
    bview->ResizeTo(dst->w,dst->h);
    bview->Flush();
	if (overlay->hwdata->first_display) {
		bview->Show();
		overlay->hwdata->first_display = false;
	}
    SDL_Win->Unlock();
    
	return 0;
}

void BE_FreeYUVOverlay(_THIS, SDL_Overlay *overlay)
{
    if (overlay == NULL)
    {
        return;
    }

    if (overlay->hwdata == NULL)
    {
        return;
    }

    current_overlay=NULL;

	delete overlay->hwdata->bbitmap;

    SDL_free(overlay->hwdata);
}

}; // extern "C"