[sdl_omap.git] / src / video / SDL_blit.c

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 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"

#include "SDL_video.h"
#include "SDL_sysvideo.h"
#include "SDL_blit.h"
#include "SDL_RLEaccel_c.h"
#include "SDL_pixels_c.h"

#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) && SDL_ASSEMBLY_ROUTINES
#define MMX_ASMBLIT
#if (__GNUC__ > 2)  /* SSE instructions aren't in GCC 2. */
#define SSE_ASMBLIT
#endif
#endif

#if defined(MMX_ASMBLIT)
#include "SDL_cpuinfo.h"
#include "mmx.h"
#endif

/* The general purpose software blit routine */
static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect,
			SDL_Surface *dst, SDL_Rect *dstrect)
{
	int okay;
	int src_locked;
	int dst_locked;

	/* Everything is okay at the beginning...  */
	okay = 1;

	/* Lock the destination if it's in hardware */
	dst_locked = 0;
	if ( SDL_MUSTLOCK(dst) ) {
		if ( SDL_LockSurface(dst) < 0 ) {
			okay = 0;
		} else {
			dst_locked = 1;
		}
	}
	/* Lock the source if it's in hardware */
	src_locked = 0;
	if ( SDL_MUSTLOCK(src) ) {
		if ( SDL_LockSurface(src) < 0 ) {
			okay = 0;
		} else {
			src_locked = 1;
		}
	}

	/* Set up source and destination buffer pointers, and BLIT! */
	if ( okay  && srcrect->w && srcrect->h ) {
		SDL_BlitInfo info;
		SDL_loblit RunBlit;

		/* Set up the blit information */
		info.s_pixels = (Uint8 *)src->pixels +
				(Uint16)srcrect->y*src->pitch +
				(Uint16)srcrect->x*src->format->BytesPerPixel;
		info.s_width = srcrect->w;
		info.s_height = srcrect->h;
		info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel;
		info.d_pixels = (Uint8 *)dst->pixels +
				(Uint16)dstrect->y*dst->pitch +
				(Uint16)dstrect->x*dst->format->BytesPerPixel;
		info.d_width = dstrect->w;
		info.d_height = dstrect->h;
		info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel;
		info.aux_data = src->map->sw_data->aux_data;
		info.src = src->format;
		info.table = src->map->table;
		info.dst = dst->format;
		RunBlit = src->map->sw_data->blit;

		/* Run the actual software blit */
		RunBlit(&info);
	}

	/* We need to unlock the surfaces if they're locked */
	if ( dst_locked ) {
		SDL_UnlockSurface(dst);
	}
	if ( src_locked ) {
		SDL_UnlockSurface(src);
	}
	/* Blit is done! */
	return(okay ? 0 : -1);
}

#ifdef MMX_ASMBLIT
static __inline__ void SDL_memcpyMMX(Uint8 *to, const Uint8 *from, int len)
{
	int i;

	for(i=0; i<len/8; i++) {
		__asm__ __volatile__ (
		"	movq (%0), %%mm0\n"
		"	movq %%mm0, (%1)\n"
		: : "r" (from), "r" (to) : "memory");
		from+=8;
		to+=8;
	}
	if (len&7)
		SDL_memcpy(to, from, len&7);
}

#ifdef SSE_ASMBLIT
static __inline__ void SDL_memcpySSE(Uint8 *to, const Uint8 *from, int len)
{
	int i;

	__asm__ __volatile__ (
	"	prefetchnta (%0)\n"
	"	prefetchnta 64(%0)\n"
	"	prefetchnta 128(%0)\n"
	"	prefetchnta 192(%0)\n"
	: : "r" (from) );

	for(i=0; i<len/8; i++) {
		__asm__ __volatile__ (
		"	prefetchnta 256(%0)\n"
		"	movq (%0), %%mm0\n"
		"	movntq %%mm0, (%1)\n"
		: : "r" (from), "r" (to) : "memory");
		from+=8;
		to+=8;
	}
	if (len&7)
		SDL_memcpy(to, from, len&7);
}
#endif
#endif

static void SDL_BlitCopy(SDL_BlitInfo *info)
{
	Uint8 *src, *dst;
	int w, h;
	int srcskip, dstskip;

	w = info->d_width*info->dst->BytesPerPixel;
	h = info->d_height;
	src = info->s_pixels;
	dst = info->d_pixels;
	srcskip = w+info->s_skip;
	dstskip = w+info->d_skip;

#ifdef SSE_ASMBLIT
	if(SDL_HasSSE())
	{
		while ( h-- ) {
			SDL_memcpySSE(dst, src, w);
			src += srcskip;
			dst += dstskip;
		}
		__asm__ __volatile__ (
		"	emms\n"
		::);
	}
	else
#endif
#ifdef MMX_ASMBLIT
	if(SDL_HasMMX())
	{
		while ( h-- ) {
			SDL_memcpyMMX(dst, src, w);
			src += srcskip;
			dst += dstskip;
		}
		__asm__ __volatile__ (
		"	emms\n"
		::);
	}
	else
#endif
	while ( h-- ) {
		SDL_memcpy(dst, src, w);
		src += srcskip;
		dst += dstskip;
	}
}

static void SDL_BlitCopyOverlap(SDL_BlitInfo *info)
{
	Uint8 *src, *dst;
	int w, h;
	int srcskip, dstskip;

	w = info->d_width*info->dst->BytesPerPixel;
	h = info->d_height;
	src = info->s_pixels;
	dst = info->d_pixels;
	srcskip = w+info->s_skip;
	dstskip = w+info->d_skip;
	if ( dst < src ) {
		while ( h-- ) {
			SDL_memcpy(dst, src, w);
			src += srcskip;
			dst += dstskip;
		}
	} else {
		src += ((h-1) * srcskip);
		dst += ((h-1) * dstskip);
		while ( h-- ) {
			SDL_revcpy(dst, src, w);
			src -= srcskip;
			dst -= dstskip;
		}
	}
}

/* Figure out which of many blit routines to set up on a surface */
int SDL_CalculateBlit(SDL_Surface *surface)
{
	int blit_index;

	/* Clean everything out to start */
	if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
		SDL_UnRLESurface(surface, 1);
	}
	surface->map->sw_blit = NULL;

	/* Figure out if an accelerated hardware blit is possible */
	surface->flags &= ~SDL_HWACCEL;
	if ( surface->map->identity ) {
		int hw_blit_ok;

		if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
			/* We only support accelerated blitting to hardware */
			if ( surface->map->dst->flags & SDL_HWSURFACE ) {
				hw_blit_ok = current_video->info.blit_hw;
			} else {
				hw_blit_ok = 0;
			}
			if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
				hw_blit_ok = current_video->info.blit_hw_CC;
			}
			if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
				hw_blit_ok = current_video->info.blit_hw_A;
			}
		} else {
			/* We only support accelerated blitting to hardware */
			if ( surface->map->dst->flags & SDL_HWSURFACE ) {
				hw_blit_ok = current_video->info.blit_sw;
			} else {
				hw_blit_ok = 0;
			}
			if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
				hw_blit_ok = current_video->info.blit_sw_CC;
			}
			if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
				hw_blit_ok = current_video->info.blit_sw_A;
			}
		}
		if ( hw_blit_ok ) {
			SDL_VideoDevice *video = current_video;
			SDL_VideoDevice *this  = current_video;
			video->CheckHWBlit(this, surface, surface->map->dst);
		}
	}
	
	/* if an alpha pixel format is specified, we can accelerate alpha blits */
	if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )&&(current_video->displayformatalphapixel)) 
	{
		if ( (surface->flags & SDL_SRCALPHA) ) 
			if ( current_video->info.blit_hw_A ) {
				SDL_VideoDevice *video = current_video;
				SDL_VideoDevice *this  = current_video;
				video->CheckHWBlit(this, surface, surface->map->dst);
			}
	}

	/* Get the blit function index, based on surface mode */
	/* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
	blit_index = 0;
	blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY))      << 0;
	if ( surface->flags & SDL_SRCALPHA
	     && (surface->format->alpha != SDL_ALPHA_OPAQUE
		 || surface->format->Amask) ) {
	        blit_index |= 2;
	}

	/* Check for special "identity" case -- copy blit */
	if ( surface->map->identity && blit_index == 0 ) {
	        surface->map->sw_data->blit = SDL_BlitCopy;

		/* Handle overlapping blits on the same surface */
		if ( surface == surface->map->dst ) {
		        surface->map->sw_data->blit = SDL_BlitCopyOverlap;
		}
	} else {
		if ( surface->format->BitsPerPixel < 8 ) {
			surface->map->sw_data->blit =
			    SDL_CalculateBlit0(surface, blit_index);
		} else {
			switch ( surface->format->BytesPerPixel ) {
			    case 1:
				surface->map->sw_data->blit =
				    SDL_CalculateBlit1(surface, blit_index);
				break;
			    case 2:
			    case 3:
			    case 4:
				surface->map->sw_data->blit =
				    SDL_CalculateBlitN(surface, blit_index);
				break;
			    default:
				surface->map->sw_data->blit = NULL;
				break;
			}
		}
	}
	/* Make sure we have a blit function */
	if ( surface->map->sw_data->blit == NULL ) {
		SDL_InvalidateMap(surface->map);
		SDL_SetError("Blit combination not supported");
		return(-1);
	}

	/* Choose software blitting function */
	if(surface->flags & SDL_RLEACCELOK
	   && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) {

	        if(surface->map->identity
		   && (blit_index == 1
		       || (blit_index == 3 && !surface->format->Amask))) {
		        if ( SDL_RLESurface(surface) == 0 )
			        surface->map->sw_blit = SDL_RLEBlit;
		} else if(blit_index == 2 && surface->format->Amask) {
		        if ( SDL_RLESurface(surface) == 0 )
			        surface->map->sw_blit = SDL_RLEAlphaBlit;
		}
	}
	
	if ( surface->map->sw_blit == NULL ) {
		surface->map->sw_blit = SDL_SoftBlit;
	}
	return(0);
}
Commit	Line	Data
e14743d1	1	/*
	2	SDL - Simple DirectMedia Layer
	3	Copyright (C) 1997-2009 Sam Lantinga
	4
	5	This library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Lesser General Public
	7	License as published by the Free Software Foundation; either
	8	version 2.1 of the License, or (at your option) any later version.
	9
	10	This library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Lesser General Public License for more details.
	14
	15	You should have received a copy of the GNU Lesser General Public
	16	License along with this library; if not, write to the Free Software
	17	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	18
	19	Sam Lantinga
	20	slouken@libsdl.org
	21	*/
	22	#include "SDL_config.h"
	23
	24	#include "SDL_video.h"
	25	#include "SDL_sysvideo.h"
	26	#include "SDL_blit.h"
	27	#include "SDL_RLEaccel_c.h"
	28	#include "SDL_pixels_c.h"
	29
	30	#if defined(__GNUC__) && (defined(__i386__) \|\| defined(__x86_64__)) && SDL_ASSEMBLY_ROUTINES
	31	#define MMX_ASMBLIT
	32	#if (__GNUC__ > 2) /* SSE instructions aren't in GCC 2. */
	33	#define SSE_ASMBLIT
	34	#endif
	35	#endif
	36
	37	#if defined(MMX_ASMBLIT)
	38	#include "SDL_cpuinfo.h"
	39	#include "mmx.h"
	40	#endif
	41
	42	/* The general purpose software blit routine */
	43	static int SDL_SoftBlit(SDL_Surface src, SDL_Rect srcrect,
	44	SDL_Surface dst, SDL_Rect dstrect)
	45	{
	46	int okay;
	47	int src_locked;
	48	int dst_locked;
	49
	50	/* Everything is okay at the beginning... */
	51	okay = 1;
	52
	53	/* Lock the destination if it's in hardware */
	54	dst_locked = 0;
	55	if ( SDL_MUSTLOCK(dst) ) {
	56	if ( SDL_LockSurface(dst) < 0 ) {
	57	okay = 0;
	58	} else {
	59	dst_locked = 1;
	60	}
	61	}
	62	/* Lock the source if it's in hardware */
	63	src_locked = 0;
	64	if ( SDL_MUSTLOCK(src) ) {
65	if ( SDL_LockSurface(src) < 0 ) {
66	okay = 0;
67	} else {
68	src_locked = 1;
69	}
70	}
71
72	/* Set up source and destination buffer pointers, and BLIT! */
73	if ( okay && srcrect->w && srcrect->h ) {
74	SDL_BlitInfo info;
75	SDL_loblit RunBlit;
76
77	/* Set up the blit information */
78	info.s_pixels = (Uint8 *)src->pixels +
79	(Uint16)srcrect->y*src->pitch +
80	(Uint16)srcrect->x*src->format->BytesPerPixel;
81	info.s_width = srcrect->w;
82	info.s_height = srcrect->h;
83	info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel;
84	info.d_pixels = (Uint8 *)dst->pixels +
85	(Uint16)dstrect->y*dst->pitch +
86	(Uint16)dstrect->x*dst->format->BytesPerPixel;
87	info.d_width = dstrect->w;
88	info.d_height = dstrect->h;
89	info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel;
90	info.aux_data = src->map->sw_data->aux_data;
91	info.src = src->format;
92	info.table = src->map->table;
93	info.dst = dst->format;
94	RunBlit = src->map->sw_data->blit;
95
96	/* Run the actual software blit */
97	RunBlit(&info);
98	}
99
100	/* We need to unlock the surfaces if they're locked */
101	if ( dst_locked ) {
102	SDL_UnlockSurface(dst);
103	}
104	if ( src_locked ) {
105	SDL_UnlockSurface(src);
106	}
107	/* Blit is done! */
108	return(okay ? 0 : -1);
109	}
110
111	#ifdef MMX_ASMBLIT
112	static __inline__ void SDL_memcpyMMX(Uint8 to, const Uint8 from, int len)
113	{
114	int i;
115
116	for(i=0; i<len/8; i++) {
117	__asm__ __volatile__ (
118	" movq (%0), %%mm0\n"
119	" movq %%mm0, (%1)\n"
120	: : "r" (from), "r" (to) : "memory");
121	from+=8;
122	to+=8;
123	}
124	if (len&7)
125	SDL_memcpy(to, from, len&7);
126	}
127
128	#ifdef SSE_ASMBLIT
129	static __inline__ void SDL_memcpySSE(Uint8 to, const Uint8 from, int len)
130	{
131	int i;
132
133	__asm__ __volatile__ (
134	" prefetchnta (%0)\n"
135	" prefetchnta 64(%0)\n"
136	" prefetchnta 128(%0)\n"
137	" prefetchnta 192(%0)\n"
138	: : "r" (from) );
139
140	for(i=0; i<len/8; i++) {
141	__asm__ __volatile__ (
142	" prefetchnta 256(%0)\n"
143	" movq (%0), %%mm0\n"
144	" movntq %%mm0, (%1)\n"
145	: : "r" (from), "r" (to) : "memory");
146	from+=8;
147	to+=8;
148	}
149	if (len&7)
150	SDL_memcpy(to, from, len&7);
151	}
152	#endif
153	#endif
154
155	static void SDL_BlitCopy(SDL_BlitInfo *info)
156	{
157	Uint8 src, dst;
158	int w, h;
159	int srcskip, dstskip;
160
161	w = info->d_width*info->dst->BytesPerPixel;
162	h = info->d_height;
163	src = info->s_pixels;
164	dst = info->d_pixels;
165	srcskip = w+info->s_skip;
166	dstskip = w+info->d_skip;
167
168	#ifdef SSE_ASMBLIT
169	if(SDL_HasSSE())
170	{
171	while ( h-- ) {
172	SDL_memcpySSE(dst, src, w);
173	src += srcskip;
174	dst += dstskip;
175	}
176	__asm__ __volatile__ (
177	" emms\n"
178	::);
179	}
180	else
181	#endif
182	#ifdef MMX_ASMBLIT
183	if(SDL_HasMMX())
184	{
185	while ( h-- ) {
186	SDL_memcpyMMX(dst, src, w);
187	src += srcskip;
188	dst += dstskip;
189	}
190	__asm__ __volatile__ (
191	" emms\n"
192	::);
193	}
194	else
195	#endif
196	while ( h-- ) {
197	SDL_memcpy(dst, src, w);
198	src += srcskip;
199	dst += dstskip;
200	}
201	}
202
203	static void SDL_BlitCopyOverlap(SDL_BlitInfo *info)
204	{
205	Uint8 src, dst;
206	int w, h;
207	int srcskip, dstskip;
208
209	w = info->d_width*info->dst->BytesPerPixel;
210	h = info->d_height;
211	src = info->s_pixels;
212	dst = info->d_pixels;
213	srcskip = w+info->s_skip;
214	dstskip = w+info->d_skip;
215	if ( dst < src ) {
216	while ( h-- ) {
217	SDL_memcpy(dst, src, w);
218	src += srcskip;
219	dst += dstskip;
220	}
221	} else {
222	src += ((h-1) * srcskip);
223	dst += ((h-1) * dstskip);
224	while ( h-- ) {
225	SDL_revcpy(dst, src, w);
226	src -= srcskip;
227	dst -= dstskip;
228	}
229	}
230	}
231
232	/* Figure out which of many blit routines to set up on a surface */
233	int SDL_CalculateBlit(SDL_Surface *surface)
234	{
235	int blit_index;
236
237	/* Clean everything out to start */
238	if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
239	SDL_UnRLESurface(surface, 1);
240	}
241	surface->map->sw_blit = NULL;
242
243	/* Figure out if an accelerated hardware blit is possible */
244	surface->flags &= ~SDL_HWACCEL;
245	if ( surface->map->identity ) {
246	int hw_blit_ok;
247
248	if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
249	/* We only support accelerated blitting to hardware */
250	if ( surface->map->dst->flags & SDL_HWSURFACE ) {
251	hw_blit_ok = current_video->info.blit_hw;
252	} else {
253	hw_blit_ok = 0;
254	}
255	if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
256	hw_blit_ok = current_video->info.blit_hw_CC;
257	}
258	if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
259	hw_blit_ok = current_video->info.blit_hw_A;
260	}
261	} else {
262	/* We only support accelerated blitting to hardware */
263	if ( surface->map->dst->flags & SDL_HWSURFACE ) {
264	hw_blit_ok = current_video->info.blit_sw;
265	} else {
266	hw_blit_ok = 0;
267	}
268	if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
269	hw_blit_ok = current_video->info.blit_sw_CC;
270	}
271	if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
272	hw_blit_ok = current_video->info.blit_sw_A;
273	}
274	}
275	if ( hw_blit_ok ) {
276	SDL_VideoDevice *video = current_video;
277	SDL_VideoDevice *this = current_video;
278	video->CheckHWBlit(this, surface, surface->map->dst);
279	}
280	}
281
282	/* if an alpha pixel format is specified, we can accelerate alpha blits */
283	if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )&&(current_video->displayformatalphapixel))
284	{
285	if ( (surface->flags & SDL_SRCALPHA) )
286	if ( current_video->info.blit_hw_A ) {
287	SDL_VideoDevice *video = current_video;
288	SDL_VideoDevice *this = current_video;
289	video->CheckHWBlit(this, surface, surface->map->dst);
290	}
291	}
292
293	/* Get the blit function index, based on surface mode */
294	/* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
295	blit_index = 0;
296	blit_index \|= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0;
297	if ( surface->flags & SDL_SRCALPHA
298	&& (surface->format->alpha != SDL_ALPHA_OPAQUE
299	\|\| surface->format->Amask) ) {
300	blit_index \|= 2;
301	}
302
303	/* Check for special "identity" case -- copy blit */
304	if ( surface->map->identity && blit_index == 0 ) {
305	surface->map->sw_data->blit = SDL_BlitCopy;
306
307	/* Handle overlapping blits on the same surface */
308	if ( surface == surface->map->dst ) {
309	surface->map->sw_data->blit = SDL_BlitCopyOverlap;
310	}
311	} else {
312	if ( surface->format->BitsPerPixel < 8 ) {
313	surface->map->sw_data->blit =
314	SDL_CalculateBlit0(surface, blit_index);
315	} else {
316	switch ( surface->format->BytesPerPixel ) {
317	case 1:
318	surface->map->sw_data->blit =
319	SDL_CalculateBlit1(surface, blit_index);
320	break;
321	case 2:
322	case 3:
323	case 4:
324	surface->map->sw_data->blit =
325	SDL_CalculateBlitN(surface, blit_index);
326	break;
327	default:
328	surface->map->sw_data->blit = NULL;
329	break;
330	}
331	}
332	}
333	/* Make sure we have a blit function */
334	if ( surface->map->sw_data->blit == NULL ) {
335	SDL_InvalidateMap(surface->map);
336	SDL_SetError("Blit combination not supported");
337	return(-1);
338	}
339
340	/* Choose software blitting function */
341	if(surface->flags & SDL_RLEACCELOK
342	&& (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) {
343
344	if(surface->map->identity
345	&& (blit_index == 1
346	\|\| (blit_index == 3 && !surface->format->Amask))) {
347	if ( SDL_RLESurface(surface) == 0 )
348	surface->map->sw_blit = SDL_RLEBlit;
349	} else if(blit_index == 2 && surface->format->Amask) {
350	if ( SDL_RLESurface(surface) == 0 )
351	surface->map->sw_blit = SDL_RLEAlphaBlit;
352	}
353	}
354
355	if ( surface->map->sw_blit == NULL ) {
356	surface->map->sw_blit = SDL_SoftBlit;
357	}
358	return(0);
359	}
360