src/video/bwindow/SDL_bframebuffer.cc
author Sam Lantinga <slouken@libsdl.org>
Sat, 31 Dec 2011 09:28:07 -0500
changeset 6138 4c64952a58fb
parent 6044 35448a5ea044
child 6885 700f1b25f77f
permissions -rwxr-xr-x
Happy New Year!
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#if SDL_VIDEO_DRIVER_BWINDOW
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#include "SDL_bframebuffer.h"
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#include <AppKit.h>
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#include <InterfaceKit.h>
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#include "SDL_bmodes.h"
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#include "SDL_BWin.h"
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#include "../../main/beos/SDL_BApp.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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int32 BE_UpdateOnce(SDL_Window *window);
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static inline SDL_BWin *_ToBeWin(SDL_Window *window) {
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	return ((SDL_BWin*)(window->driverdata));
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}
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static inline SDL_BApp *_GetBeApp() {
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	return ((SDL_BApp*)be_app);
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}
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int BE_CreateWindowFramebuffer(_THIS, SDL_Window * window,
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                                       Uint32 * format,
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                                       void ** pixels, int *pitch) {
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	SDL_BWin *bwin = _ToBeWin(window);
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	BScreen bscreen;
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	if(!bscreen.IsValid()) {
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		return -1;
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	}
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	while(!bwin->Connected()) { snooze(100); }
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	/* Make sure we have exclusive access to frame buffer data */
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	bwin->LockBuffer();
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	/* format */
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	display_mode bmode;
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	bscreen.GetMode(&bmode);
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	int32 bpp = BE_ColorSpaceToBitsPerPixel(bmode.space);
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	*format = BE_BPPToSDLPxFormat(bpp);
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	/* Create the new bitmap object */
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	BBitmap *bitmap = bwin->GetBitmap();
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	if(bitmap) {
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		delete bitmap;
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	}
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	bitmap = new BBitmap(bwin->Bounds(), (color_space)bmode.space,
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			false,	/* Views not accepted */
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			true);	/* Contiguous memory required */
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	if(bitmap->InitCheck() != B_OK) {
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		SDL_SetError("Could not initialize back buffer!\n");
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		return -1;
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	}
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	bwin->SetBitmap(bitmap);
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	/* Set the pixel pointer */
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	*pixels = bitmap->Bits();
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	/* pitch = width of window, in bytes */
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	*pitch = bitmap->BytesPerRow();
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	bwin->SetBufferExists(true);
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	bwin->SetTrashBuffer(false);
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	bwin->UnlockBuffer();
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	return 0;
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}
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int BE_UpdateWindowFramebuffer(_THIS, SDL_Window * window,
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                                      SDL_Rect * rects, int numrects) {
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	if(!window)
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		return 0;
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	SDL_BWin *bwin = _ToBeWin(window);
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#ifdef DRAWTHREAD	
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	bwin->LockBuffer();
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	bwin->SetBufferDirty(true);
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	bwin->UnlockBuffer();
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#else
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	bwin->SetBufferDirty(true);
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	BE_UpdateOnce(window);
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#endif
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	return 0;
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}
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int32 BE_DrawThread(void *data) {
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	SDL_BWin *bwin = (SDL_BWin*)data;
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	BScreen bscreen;
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	if(!bscreen.IsValid()) {
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		return -1;
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	}
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	while(bwin->ConnectionEnabled()) {
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		if( bwin->Connected() && bwin->BufferExists() && bwin->BufferIsDirty() ) {
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			bwin->LockBuffer();
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			BBitmap *bitmap = NULL;
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			bitmap = bwin->GetBitmap();
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			int32 windowPitch = bitmap->BytesPerRow();
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			int32 bufferPitch = bwin->GetRowBytes();
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			uint8 *windowpx;
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			uint8 *bufferpx;
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			int32 BPP = bwin->GetBytesPerPx();
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			int32 windowSub = bwin->GetFbX() * BPP +
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						  bwin->GetFbY() * windowPitch;
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			clipping_rect *clips = bwin->GetClips();
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			int32 numClips = bwin->GetNumClips();
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			int i, y;
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			/* Blit each clipping rectangle */
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			bscreen.WaitForRetrace();
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			for(i = 0; i < numClips; ++i) {
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				clipping_rect rc = clips[i];
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				/* Get addresses of the start of each clipping rectangle */
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				int32 width = clips[i].right - clips[i].left + 1;
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				int32 height = clips[i].bottom - clips[i].top + 1;
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				bufferpx = bwin->GetBufferPx() + 
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					clips[i].top * bufferPitch + clips[i].left * BPP;
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				windowpx = (uint8*)bitmap->Bits() + 
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					clips[i].top * windowPitch + clips[i].left * BPP -
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					windowSub;
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				/* Copy each row of pixels from the window buffer into the frame
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				   buffer */
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				for(y = 0; y < height; ++y)
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				{
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					if(bwin->CanTrashWindowBuffer()) {
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						goto escape;	/* Break out before the buffer is killed */
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					}
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					memcpy(bufferpx, windowpx, width * BPP);
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					bufferpx += bufferPitch;
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					windowpx += windowPitch;
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				}
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			}
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			bwin->SetBufferDirty(false);
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escape:
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			bwin->UnlockBuffer();
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		} else {
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			snooze(16000);
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		}
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	}
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	return B_OK;
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}
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void BE_DestroyWindowFramebuffer(_THIS, SDL_Window * window) {
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	SDL_BWin *bwin = _ToBeWin(window);
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	bwin->LockBuffer();
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	/* Free and clear the window buffer */
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	BBitmap *bitmap = bwin->GetBitmap();
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	delete bitmap;
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	bwin->SetBitmap(NULL);
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	bwin->SetBufferExists(false);
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	bwin->UnlockBuffer();
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}
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/*
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 * TODO:
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 * This was written to test if certain errors were caused by threading issues.
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 * The specific issues have since become rare enough that they may have been
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 * solved, but I doubt it- they were pretty sporadic before now.
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 */
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int32 BE_UpdateOnce(SDL_Window *window) {
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	SDL_BWin *bwin = _ToBeWin(window);
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	BScreen bscreen;
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	if(!bscreen.IsValid()) {
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		return -1;
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	}
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	if(bwin->ConnectionEnabled() && bwin->Connected()) {
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		bwin->LockBuffer();
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		int32 windowPitch = window->surface->pitch;
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		int32 bufferPitch = bwin->GetRowBytes();
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		uint8 *windowpx;
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		uint8 *bufferpx;
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		int32 BPP = bwin->GetBytesPerPx();
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		uint8 *windowBaseAddress = (uint8*)window->surface->pixels;
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		int32 windowSub = bwin->GetFbX() * BPP +
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						  bwin->GetFbY() * windowPitch;
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		clipping_rect *clips = bwin->GetClips();
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		int32 numClips = bwin->GetNumClips();
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		int i, y;
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		/* Blit each clipping rectangle */
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		bscreen.WaitForRetrace();
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		for(i = 0; i < numClips; ++i) {
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			clipping_rect rc = clips[i];
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			/* Get addresses of the start of each clipping rectangle */
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			int32 width = clips[i].right - clips[i].left + 1;
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			int32 height = clips[i].bottom - clips[i].top + 1;
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			bufferpx = bwin->GetBufferPx() + 
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				clips[i].top * bufferPitch + clips[i].left * BPP;
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			windowpx = windowBaseAddress + 
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				clips[i].top * windowPitch + clips[i].left * BPP - windowSub;
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			/* Copy each row of pixels from the window buffer into the frame
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			   buffer */
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			for(y = 0; y < height; ++y)
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			{
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				memcpy(bufferpx, windowpx, width * BPP);
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				bufferpx += bufferPitch;
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				windowpx += windowPitch;
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			}
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		}
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		bwin->UnlockBuffer();
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	}
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	return 0;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* SDL_VIDEO_DRIVER_BWINDOW */