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Massive Quartz input enhancements from Darrell Walisser. His email: Enclosed is a patch that addresses the following: --Various minor cleanups. Removed dead/obsolete code, made some style cleanups --Mouse Events Now keep track of what button(s) were pressed so we know when to send the mouse up event. This fixes the case where the mouse is dragged outside of the game window and released (in which case we want to send the mouse up event even though the mouse is outside the game window). --Input Grabbing Here is my take on the grabbing situation, which is the basis for the new implementation. There are 3 grab states, ungrabbed (UG), visible (VG), and invisible (IG). Both VG and IG keep the mouse constrained to the window and produce relative motion events. In VG the cursor is visible (duh), in IG it is not. In VG, absolute motion events also work. There are 6 actions that can affect grabbing: 1. Set Fullscreen/Window (F/W). In fullscreen, a visible grab should do nothing. However, a fullscreen visible grab can be treated just like a windowed visible grab, which is what I have done to help simplify things. 2. Cursor hide/show (H/S). If the cursor is hidden when grabbing, the grab is an invisible grab. If the cursor is visible, the grab should just constrain the mouse to the window. 3. Input grab/ungrab(G/U). If grabbed, the cursor should be confined to the window as should the keyboard input. On Mac OS X, the keyboard input is implicitly grabbed by confining the cursor, except for command-tab which can switch away from the application. Should the window come to the foreground if the application is deactivated and grab input is called? This isn't necessary in this implementation because the grab state will be asserted upon activation. Using my notation, these are all the cases that need to be handled (state + action = new state). UG+U = UG UG+G = VG or IG, if cursor is visible or not UG+H = UG UG+S = UG VG+U = UG VG+G = VG VG+H = IG VG+S = VG IG+U = UG IG+G = IG IG+H = IG IG+S = VG The cases that result in the same state can be ignored in the code, which cuts it down to just 5 cases. Another issue is what happens when the app loses/gains input focus from deactivate/activate or iconify/deiconify. I think that if input focus is ever lost (outside of SDL's control), the grab state should be suspended and the cursor should become visible and active again. When regained, the cursor should reappear in its original location and/or grab state. This way, when reactivating the cursor is still in the same position as before so apps shouldn't get confused when the next motion event comes in. This is what I've done in this patch.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 27 Dec 2002 20:52:41 +0000
parents 417f8709e648
children 5bb080d35049
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

#ifndef _SDL_blit_h
#define _SDL_blit_h

#include "SDL_endian.h"

/* The structure passed to the low level blit functions */
typedef struct {
	Uint8 *s_pixels;
	int s_width;
	int s_height;
	int s_skip;
	Uint8 *d_pixels;
	int d_width;
	int d_height;
	int d_skip;
	void *aux_data;
	SDL_PixelFormat *src;
	Uint8 *table;
	SDL_PixelFormat *dst;
} SDL_BlitInfo;

/* The type definition for the low level blit functions */
typedef void (*SDL_loblit)(SDL_BlitInfo *info);

/* This is the private info structure for software accelerated blits */
struct private_swaccel {
	SDL_loblit blit;
	void *aux_data;
};

/* Blit mapping definition */
typedef struct SDL_BlitMap {
	SDL_Surface *dst;
	int identity;
	Uint8 *table;
	SDL_blit hw_blit;
	SDL_blit sw_blit;
	struct private_hwaccel *hw_data;
	struct private_swaccel *sw_data;

	/* the version count matches the destination; mismatch indicates
	   an invalid mapping */
        unsigned int format_version;
} SDL_BlitMap;


/* Functions found in SDL_blit.c */
extern int SDL_CalculateBlit(SDL_Surface *surface);

/* Functions found in SDL_blit_{0,1,N,A}.c */
extern SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int complex);
extern SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int complex);
extern SDL_loblit SDL_CalculateBlitN(SDL_Surface *surface, int complex);
extern SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface *surface, int complex);

/*
 * Useful macros for blitting routines
 */

#define FORMAT_EQUAL(A, B)						\
    ((A)->BitsPerPixel == (B)->BitsPerPixel				\
     && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask))

/* Load pixel of the specified format from a buffer and get its R-G-B values */
/* FIXME: rescale values to 0..255 here? */
#define RGB_FROM_PIXEL(pixel, fmt, r, g, b)				\
{									\
	r = (((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); 		\
	g = (((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); 		\
	b = (((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); 		\
}
#define RGB_FROM_RGB565(pixel, r, g, b)					\
{									\
	r = (((pixel&0xF800)>>11)<<3);		 			\
	g = (((pixel&0x07E0)>>5)<<2); 					\
	b = ((pixel&0x001F)<<3); 					\
}
#define RGB_FROM_RGB555(pixel, r, g, b)					\
{									\
	r = (((pixel&0x7C00)>>10)<<3);		 			\
	g = (((pixel&0x03E0)>>5)<<3); 					\
	b = ((pixel&0x001F)<<3); 					\
}
#define RGB_FROM_RGB888(pixel, r, g, b)					\
{									\
	r = ((pixel&0xFF0000)>>16);		 			\
	g = ((pixel&0xFF00)>>8);		 			\
	b = (pixel&0xFF);			 			\
}
#define RETRIEVE_RGB_PIXEL(buf, bpp, pixel)				   \
do {									   \
	switch (bpp) {							   \
		case 2:							   \
			pixel = *((Uint16 *)(buf));			   \
		break;							   \
									   \
		case 3: {						   \
		        Uint8 *B = (Uint8 *)(buf);			   \
			if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		   \
			        pixel = B[0] + (B[1] << 8) + (B[2] << 16); \
			} else {					   \
			        pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \
			}						   \
		}							   \
		break;							   \
									   \
		case 4:							   \
			pixel = *((Uint32 *)(buf));			   \
		break;							   \
									   \
		default:						   \
			pixel = 0; /* appease gcc */			   \
		break;							   \
	}								   \
} while(0)

#define DISEMBLE_RGB(buf, bpp, fmt, pixel, r, g, b)			   \
do {									   \
	switch (bpp) {							   \
		case 2:							   \
			pixel = *((Uint16 *)(buf));			   \
		break;							   \
									   \
		case 3: {						   \
		        Uint8 *B = (Uint8 *)buf;			   \
			if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		   \
			        pixel = B[0] + (B[1] << 8) + (B[2] << 16); \
			} else {					   \
			        pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \
			}						   \
		}							   \
		break;							   \
									   \
		case 4:							   \
			pixel = *((Uint32 *)(buf));			   \
		break;							   \
									   \
	        default:						   \
		        pixel = 0;	/* prevent gcc from complaining */ \
		break;							   \
	}								   \
	RGB_FROM_PIXEL(pixel, fmt, r, g, b);				   \
} while(0)

/* Assemble R-G-B values into a specified pixel format and store them */
#define PIXEL_FROM_RGB(pixel, fmt, r, g, b)				\
{									\
	pixel = ((r>>fmt->Rloss)<<fmt->Rshift)|				\
		((g>>fmt->Gloss)<<fmt->Gshift)|				\
		((b>>fmt->Bloss)<<fmt->Bshift);				\
}
#define RGB565_FROM_RGB(pixel, r, g, b)					\
{									\
	pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3);			\
}
#define RGB555_FROM_RGB(pixel, r, g, b)					\
{									\
	pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3);			\
}
#define RGB888_FROM_RGB(pixel, r, g, b)					\
{									\
	pixel = (r<<16)|(g<<8)|b;					\
}
#define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) 				\
{									\
	switch (bpp) {							\
		case 2: {						\
			Uint16 pixel;					\
									\
			PIXEL_FROM_RGB(pixel, fmt, r, g, b);		\
			*((Uint16 *)(buf)) = pixel;			\
		}							\
		break;							\
									\
		case 3: {						\
                        if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
			        *((buf)+fmt->Rshift/8) = r;		\
				*((buf)+fmt->Gshift/8) = g;		\
				*((buf)+fmt->Bshift/8) = b;		\
			} else {					\
			        *((buf)+2-fmt->Rshift/8) = r;		\
				*((buf)+2-fmt->Gshift/8) = g;		\
				*((buf)+2-fmt->Bshift/8) = b;		\
			}						\
		}							\
		break;							\
									\
		case 4: {						\
			Uint32 pixel;					\
									\
			PIXEL_FROM_RGB(pixel, fmt, r, g, b);		\
			*((Uint32 *)(buf)) = pixel;			\
		}							\
		break;							\
	}								\
}
#define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask)		\
{									\
	switch (bpp) {							\
		case 2: {						\
			Uint16 *bufp;					\
			Uint16 pixel;					\
									\
			bufp = (Uint16 *)buf;				\
			PIXEL_FROM_RGB(pixel, fmt, r, g, b);		\
			*bufp = pixel | (*bufp & Amask);		\
		}							\
		break;							\
									\
		case 3: {						\
                        if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
			        *((buf)+fmt->Rshift/8) = r;		\
				*((buf)+fmt->Gshift/8) = g;		\
				*((buf)+fmt->Bshift/8) = b;		\
			} else {					\
			        *((buf)+2-fmt->Rshift/8) = r;		\
				*((buf)+2-fmt->Gshift/8) = g;		\
				*((buf)+2-fmt->Bshift/8) = b;		\
			}						\
		}							\
		break;							\
									\
		case 4: {						\
			Uint32 *bufp;					\
			Uint32 pixel;					\
									\
			bufp = (Uint32 *)buf;				\
			PIXEL_FROM_RGB(pixel, fmt, r, g, b);		\
			*bufp = pixel | (*bufp & Amask);		\
		}							\
		break;							\
	}								\
}

/* FIXME: Should we rescale alpha into 0..255 here? */
#define RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a)				\
{									\
	r = ((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; 		\
	g = ((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; 		\
	b = ((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; 		\
	a = ((pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss;	 	\
}
#define RGBA_FROM_8888(pixel, fmt, r, g, b, a)	\
{						\
	r = (pixel&fmt->Rmask)>>fmt->Rshift;	\
	g = (pixel&fmt->Gmask)>>fmt->Gshift;	\
	b = (pixel&fmt->Bmask)>>fmt->Bshift;	\
	a = (pixel&fmt->Amask)>>fmt->Ashift;	\
}
#define RGBA_FROM_RGBA8888(pixel, r, g, b, a)				\
{									\
	r = (pixel>>24);						\
	g = ((pixel>>16)&0xFF);						\
	b = ((pixel>>8)&0xFF);						\
	a = (pixel&0xFF);						\
}
#define RGBA_FROM_ARGB8888(pixel, r, g, b, a)				\
{									\
	r = ((pixel>>16)&0xFF);						\
	g = ((pixel>>8)&0xFF);						\
	b = (pixel&0xFF);						\
	a = (pixel>>24);						\
}
#define RGBA_FROM_ABGR8888(pixel, r, g, b, a)				\
{									\
	r = (pixel&0xFF);						\
	g = ((pixel>>8)&0xFF);						\
	b = ((pixel>>16)&0xFF);						\
	a = (pixel>>24);						\
}
#define DISEMBLE_RGBA(buf, bpp, fmt, pixel, r, g, b, a)			   \
do {									   \
	switch (bpp) {							   \
		case 2:							   \
			pixel = *((Uint16 *)(buf));			   \
		break;							   \
									   \
		case 3:	{/* FIXME: broken code (no alpha) */		   \
		        Uint8 *b = (Uint8 *)buf;			   \
			if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		   \
			        pixel = b[0] + (b[1] << 8) + (b[2] << 16); \
			} else {					   \
			        pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \
			}						   \
		}							   \
		break;							   \
									   \
		case 4:							   \
			pixel = *((Uint32 *)(buf));			   \
		break;							   \
									   \
		default:						   \
		        pixel = 0; /* stop gcc complaints */		   \
		break;							   \
	}								   \
	RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a);			   \
	pixel &= ~fmt->Amask;						   \
} while(0)

/* FIXME: this isn't correct, especially for Alpha (maximum != 255) */
#define PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a)				\
{									\
	pixel = ((r>>fmt->Rloss)<<fmt->Rshift)|				\
		((g>>fmt->Gloss)<<fmt->Gshift)|				\
		((b>>fmt->Bloss)<<fmt->Bshift)|				\
		((a>>fmt->Aloss)<<fmt->Ashift);				\
}
#define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a)			\
{									\
	switch (bpp) {							\
		case 2: {						\
			Uint16 pixel;					\
									\
			PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a);	\
			*((Uint16 *)(buf)) = pixel;			\
		}							\
		break;							\
									\
		case 3: { /* FIXME: broken code (no alpha) */		\
                        if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
			        *((buf)+fmt->Rshift/8) = r;		\
				*((buf)+fmt->Gshift/8) = g;		\
				*((buf)+fmt->Bshift/8) = b;		\
			} else {					\
			        *((buf)+2-fmt->Rshift/8) = r;		\
				*((buf)+2-fmt->Gshift/8) = g;		\
				*((buf)+2-fmt->Bshift/8) = b;		\
			}						\
		}							\
		break;							\
									\
		case 4: {						\
			Uint32 pixel;					\
									\
			PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a);	\
			*((Uint32 *)(buf)) = pixel;			\
		}							\
		break;							\
	}								\
}

/* Blend the RGB values of two pixels based on a source alpha value */
#define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB)	\
do {						\
	dR = (((sR-dR)*(A))>>8)+dR;		\
	dG = (((sG-dG)*(A))>>8)+dG;		\
	dB = (((sB-dB)*(A))>>8)+dB;		\
} while(0)

/* This is a very useful loop for optimizing blitters */
#if defined(_MSC_VER) && (_MSC_VER == 1300)
/* There's a bug in the Visual C++ 7 optimizer when compiling this code */
#else
#define USE_DUFFS_LOOP
#endif
#ifdef USE_DUFFS_LOOP

/* 8-times unrolled loop */
#define DUFFS_LOOP8(pixel_copy_increment, width)			\
{ int n = (width+7)/8;							\
	switch (width & 7) {						\
	case 0: do {	pixel_copy_increment;				\
	case 7:		pixel_copy_increment;				\
	case 6:		pixel_copy_increment;				\
	case 5:		pixel_copy_increment;				\
	case 4:		pixel_copy_increment;				\
	case 3:		pixel_copy_increment;				\
	case 2:		pixel_copy_increment;				\
	case 1:		pixel_copy_increment;				\
		} while ( --n > 0 );					\
	}								\
}

/* 4-times unrolled loop */
#define DUFFS_LOOP4(pixel_copy_increment, width)			\
{ int n = (width+3)/4;							\
	switch (width & 3) {						\
	case 0: do {	pixel_copy_increment;				\
	case 3:		pixel_copy_increment;				\
	case 2:		pixel_copy_increment;				\
	case 1:		pixel_copy_increment;				\
		} while ( --n > 0 );					\
	}								\
}

/* Use the 8-times version of the loop by default */
#define DUFFS_LOOP(pixel_copy_increment, width)				\
	DUFFS_LOOP8(pixel_copy_increment, width)

#else

/* Don't use Duff's device to unroll loops */
#define DUFFS_LOOP(pixel_copy_increment, width)				\
{ int n;								\
	for ( n=width; n > 0; --n ) {					\
		pixel_copy_increment;					\
	}								\
}
#define DUFFS_LOOP8(pixel_copy_increment, width)			\
	DUFFS_LOOP(pixel_copy_increment, width)
#define DUFFS_LOOP4(pixel_copy_increment, width)			\
	DUFFS_LOOP(pixel_copy_increment, width)

#endif /* USE_DUFFS_LOOP */

/* Prevent Visual C++ 6.0 from printing out stupid warnings */
#if defined(_MSC_VER) && (_MSC_VER >= 600)
#pragma warning(disable: 4550)
#endif

#endif /* _SDL_blit_h */