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root/cebix/BasiliskII/src/Unix/video_vosf.h

Comparing BasiliskII/src/Unix/video_vosf.h (file contents):
Revision 1.25 by cebix, 2001-07-03T15:59:47Z vs.
Revision 1.50 by gbeauche, 2005-04-02T09:50:17Z

#	Line 1 | Line 1
1		/*
2		*  video_vosf.h - Video/graphics emulation, video on SEGV signals support
3		*
4	<	*  Basilisk II (C) 1997-2001 Christian Bauer
4	>	*  Basilisk II (C) 1997-2005 Christian Bauer
5		*
6		*  This program is free software; you can redistribute it and/or modify
7		*  it under the terms of the GNU General Public License as published by
#	Line 21 | Line 21
21		#ifndef VIDEO_VOSF_H
22		#define VIDEO_VOSF_H
23
24	<	// Note: this file is #include'd in video_x.cpp
24	>	// Note: this file must be #include'd only in video_x.cpp
25		#ifdef ENABLE_VOSF
26
27	–	#include <fcntl.h>
28	–	#include <sys/mman.h>
27		#include "sigsegv.h"
28		#include "vm_alloc.h"
29	+	#ifdef _WIN32
30	+	#include "util_windows.h"
31	+	#endif
32
33	<	#ifdef ENABLE_MON
34	<	# include "mon.h"
33	>	// Glue for SDL and X11 support
34	>	#ifdef USE_SDL_VIDEO
35	>	#define MONITOR_INIT                    SDL_monitor_desc &monitor
36	>	#define VIDEO_DRV_INIT                  driver_window *drv
37	>	#define VIDEO_DRV_ROW_BYTES             drv->s->pitch
38	>	#define VIDEO_DRV_LOCK_PIXELS   if (SDL_MUSTLOCK(drv->s)) SDL_LockSurface(drv->s)
39	>	#define VIDEO_DRV_UNLOCK_PIXELS if (SDL_MUSTLOCK(drv->s)) SDL_UnlockSurface(drv->s)
40	>	#else
41	>	#ifdef SHEEPSHAVER
42	>	#define MONITOR_INIT                    /* nothing */
43	>	#define VIDEO_DRV_INIT                  /* nothing */
44	>	#define VIDEO_DRV_WINDOW                the_win
45	>	#define VIDEO_DRV_GC                    the_gc
46	>	#define VIDEO_DRV_IMAGE                 img
47	>	#define VIDEO_DRV_HAVE_SHM              have_shm
48	>	#else
49	>	#define MONITOR_INIT                    X11_monitor_desc &monitor
50	>	#define VIDEO_DRV_INIT                  driver_window *drv
51	>	#define VIDEO_DRV_WINDOW                drv->w
52	>	#define VIDEO_DRV_GC                    drv->gc
53	>	#define VIDEO_DRV_IMAGE                 drv->img
54	>	#define VIDEO_DRV_HAVE_SHM              drv->have_shm
55	>	#endif
56	>	#define VIDEO_DRV_LOCK_PIXELS   /* nothing */
57	>	#define VIDEO_DRV_UNLOCK_PIXELS /* nothing */
58	>	#define VIDEO_DRV_ROW_BYTES             VIDEO_DRV_IMAGE->bytes_per_line
59		#endif
60
61		// Variables for Video on SEGV support
62		static uint8 *the_host_buffer;  // Host frame buffer in VOSF mode
63	<	static uint32 the_buffer_size;  // Size of allocated the_buffer
63	>	static uint32 the_host_buffer_row_bytes; // Host frame buffer number of bytes per row
64
65		struct ScreenPageInfo {
66		int top, bottom;                    // Mapping between this virtual page and Mac scanlines
67		};
68
69		struct ScreenInfo {
45	–	uintptr memBase;                    // Real start address
70		uintptr memStart;                   // Start address aligned to page boundary
47	–	uintptr memEnd;                             // Address of one-past-the-end of the screen
71		uint32 memLength;                   // Length of the memory addressed by the screen pages
72
73	<	uint32 pageSize;                    // Size of a page
73	>	uintptr pageSize;                   // Size of a page
74		int pageBits;                               // Shift count to get the page number
75		uint32 pageCount;                   // Number of pages allocated to the screen
76
77		bool dirty;                                     // Flag: set if the frame buffer was touched
78	+	bool very_dirty;                        // Flag: set if the frame buffer was completely modified (e.g. colormap changes)
79		char * dirtyPages;                  // Table of flags set if page was altered
80		ScreenPageInfo * pageInfo;  // Table of mappings page -> Mac scanlines
81		};
#	Line 97 | Line 121 | static ScreenInfo mainBuffer;
121		#define PFLAG_CLEAR_ALL do { \
122		PFLAG_CLEAR_RANGE(0, mainBuffer.pageCount); \
123		mainBuffer.dirty = false; \
124	+	mainBuffer.very_dirty = false; \
125	+	} while (0)
126	+
127	+	#define PFLAG_SET_VERY_DIRTY do { \
128	+	mainBuffer.very_dirty = true; \
129		} while (0)
130
131		// Set the following macro definition to 1 if your system
#	Line 131 | Line 160 | static inline int find_next_page_clear(i
160		#endif
161		}
162
163	<	#ifdef HAVE_PTHREADS
163	>	#ifdef HAVE_SPINLOCKS
164	>	static spinlock_t vosf_lock = SPIN_LOCK_UNLOCKED;                               // Mutex to protect frame buffer (dirtyPages in fact)
165	>	#define LOCK_VOSF spin_lock(&vosf_lock)
166	>	#define UNLOCK_VOSF spin_unlock(&vosf_lock)
167	>	#elif defined(_WIN32)
168	>	static mutex_t vosf_lock;                                                                               // Mutex to protect frame buffer (dirtyPages in fact)
169	>	#define LOCK_VOSF vosf_lock.lock();
170	>	#define UNLOCK_VOSF vosf_lock.unlock();
171	>	#elif defined(HAVE_PTHREADS)
172		static pthread_mutex_t vosf_lock = PTHREAD_MUTEX_INITIALIZER;   // Mutex to protect frame buffer (dirtyPages in fact)
173		#define LOCK_VOSF pthread_mutex_lock(&vosf_lock);
174		#define UNLOCK_VOSF pthread_mutex_unlock(&vosf_lock);
#	Line 154 | Line 191 | static int log_base_2(uint32 x)
191		// Extend size to page boundary
192		static uint32 page_extend(uint32 size)
193		{
194	<	const uint32 page_size = getpagesize();
194	>	const uint32 page_size = vm_get_page_size();
195		const uint32 page_mask = page_size - 1;
196		return (size + page_mask) & ~page_mask;
197		}
198
199
200		/*
201	<	*  Initialize mainBuffer structure
201	>	*  Check if VOSF acceleration is profitable on this platform
202		*/
203
204	<	static bool video_init_buffer(void)
204	>	const int VOSF_PROFITABLE_TRIES = 3;                    // Make 3 attempts for full screen update
205	>	const int VOSF_PROFITABLE_THRESHOLD = 16667;    // 60 Hz
206	>
207	>	static bool video_vosf_profitable(void)
208		{
209	<	if (use_vosf) {
210	<	const uint32 page_size  = getpagesize();
211	<	const uint32 page_mask  = page_size - 1;
212	<
213	<	mainBuffer.memBase      = (uintptr) the_buffer;
214	<	// Round up frame buffer base to page boundary
215	<	mainBuffer.memStart             = (uintptr)((((unsigned long) the_buffer) + page_mask) & ~page_mask);
216	<	mainBuffer.memLength    = the_buffer_size;
177	<	mainBuffer.memEnd       = mainBuffer.memStart + mainBuffer.memLength;
178	<
179	<	mainBuffer.pageSize     = page_size;
180	<	mainBuffer.pageCount    = (mainBuffer.memLength + page_mask)/mainBuffer.pageSize;
181	<	mainBuffer.pageBits     = log_base_2(mainBuffer.pageSize);
182	<
183	<	if (mainBuffer.dirtyPages) {
184	<	free(mainBuffer.dirtyPages);
185	<	mainBuffer.dirtyPages = NULL;
209	>	int64 durations[VOSF_PROFITABLE_TRIES];
210	>	int mean_duration = 0;
211	>
212	>	for (int i = 0; i < VOSF_PROFITABLE_TRIES; i++) {
213	>	uint64 start = GetTicks_usec();
214	>	for (int p = 0; p < mainBuffer.pageCount; p++) {
215	>	uint8 *addr = (uint8 *)(mainBuffer.memStart + (p * mainBuffer.pageSize));
216	>	addr[0] = 0; // Trigger Screen_fault_handler()
217		}
218	+	int64 duration = GetTicks_usec() - start;
219	+	mean_duration += duration;
220	+	durations[i] = duration;
221
222	<	mainBuffer.dirtyPages = (char *) malloc(mainBuffer.pageCount + 2);
222	>	PFLAG_CLEAR_ALL;
223	>	mainBuffer.dirty = false;
224	>	if (vm_protect((char *)mainBuffer.memStart, mainBuffer.memLength, VM_PAGE_READ) != 0)
225	>	return false;
226	>	}
227
228	<	if (mainBuffer.pageInfo) {
229	<	free(mainBuffer.pageInfo);
230	<	mainBuffer.pageInfo = NULL;
231	<	}
228	>	mean_duration /= VOSF_PROFITABLE_TRIES;
229	>	D(bug("Triggered %d screen faults in %ld usec on average\n", mainBuffer.pageCount, mean_duration));
230	>	return (mean_duration < (VOSF_PROFITABLE_THRESHOLD * (frame_skip ? frame_skip : 1)));
231	>	}
232
195	–	mainBuffer.pageInfo = (ScreenPageInfo *) malloc(mainBuffer.pageCount * sizeof(ScreenPageInfo));
233
234	<	if ((mainBuffer.dirtyPages == NULL) || (mainBuffer.pageInfo == NULL))
235	<	return false;
236	<
200	<	mainBuffer.dirty = false;
234	>	/*
235	>	*  Initialize the VOSF system (mainBuffer structure, SIGSEGV handler)
236	>	*/
237
238	<	PFLAG_CLEAR_ALL;
239	<	// Safety net to insure the loops in the update routines will terminate
240	<	// See "How can we deal with array overrun conditions ?" hereunder for further details
241	<	PFLAG_CLEAR(mainBuffer.pageCount);
242	<	PFLAG_SET(mainBuffer.pageCount+1);
243	<
244	<	uint32 a = 0;
245	<	for (int i = 0; i < mainBuffer.pageCount; i++) {
246	<	int y1 = a / VideoMonitor.mode.bytes_per_row;
247	<	if (y1 >= VideoMonitor.mode.y)
248	<	y1 = VideoMonitor.mode.y - 1;
249	<
250	<	int y2 = (a + mainBuffer.pageSize) / VideoMonitor.mode.bytes_per_row;
251	<	if (y2 >= VideoMonitor.mode.y)
252	<	y2 = VideoMonitor.mode.y - 1;
253	<
254	<	mainBuffer.pageInfo[i].top = y1;
255	<	mainBuffer.pageInfo[i].bottom = y2;
256	<
257	<	a += mainBuffer.pageSize;
258	<	if (a > mainBuffer.memLength)
259	<	a = mainBuffer.memLength;
260	<	}
238	>	static bool video_vosf_init(MONITOR_INIT)
239	>	{
240	>	VIDEO_MODE_INIT_MONITOR;
241	>
242	>	const uintptr page_size = vm_get_page_size();
243	>	const uintptr page_mask = page_size - 1;
244	>
245	>	// Round up frame buffer base to page boundary
246	>	mainBuffer.memStart = (((uintptr) the_buffer) + page_mask) & ~page_mask;
247	>
248	>	// The frame buffer size shall already be aligned to page boundary (use page_extend)
249	>	mainBuffer.memLength = the_buffer_size;
250	>
251	>	mainBuffer.pageSize = page_size;
252	>	mainBuffer.pageBits = log_base_2(mainBuffer.pageSize);
253	>	mainBuffer.pageCount =  (mainBuffer.memLength + page_mask)/mainBuffer.pageSize;
254	>
255	>	// The "2" more bytes requested are a safety net to insure the
256	>	// loops in the update routines will terminate.
257	>	// See "How can we deal with array overrun conditions ?" hereunder for further details.
258	>	mainBuffer.dirtyPages = (char *) malloc(mainBuffer.pageCount + 2);
259	>	if (mainBuffer.dirtyPages == NULL)
260	>	return false;
261
262	<	// We can now write-protect the frame buffer
263	<	if (vm_protect((char *)mainBuffer.memStart, mainBuffer.memLength, VM_PAGE_READ) != 0)
264	<	return false;
262	>	PFLAG_CLEAR_ALL;
263	>	PFLAG_CLEAR(mainBuffer.pageCount);
264	>	PFLAG_SET(mainBuffer.pageCount+1);
265	>
266	>	// Allocate and fill in pageInfo with start and end (inclusive) row in number of bytes
267	>	mainBuffer.pageInfo = (ScreenPageInfo *) malloc(mainBuffer.pageCount * sizeof(ScreenPageInfo));
268	>	if (mainBuffer.pageInfo == NULL)
269	>	return false;
270	>
271	>	uint32 a = 0;
272	>	for (unsigned i = 0; i < mainBuffer.pageCount; i++) {
273	>	unsigned y1 = a / VIDEO_MODE_ROW_BYTES;
274	>	if (y1 >= VIDEO_MODE_Y)
275	>	y1 = VIDEO_MODE_Y - 1;
276	>
277	>	unsigned y2 = (a + mainBuffer.pageSize) / VIDEO_MODE_ROW_BYTES;
278	>	if (y2 >= VIDEO_MODE_Y)
279	>	y2 = VIDEO_MODE_Y - 1;
280	>
281	>	mainBuffer.pageInfo[i].top = y1;
282	>	mainBuffer.pageInfo[i].bottom = y2;
283	>
284	>	a += mainBuffer.pageSize;
285	>	if (a > mainBuffer.memLength)
286	>	a = mainBuffer.memLength;
287		}
288	+
289	+	// We can now write-protect the frame buffer
290	+	if (vm_protect((char *)mainBuffer.memStart, mainBuffer.memLength, VM_PAGE_READ) != 0)
291	+	return false;
292	+
293	+	// The frame buffer is sane, i.e. there is no write to it yet
294	+	mainBuffer.dirty = false;
295		return true;
296		}
297
298
299		/*
300	+	* Deinitialize VOSF system
301	+	*/
302	+
303	+	static void video_vosf_exit(void)
304	+	{
305	+	if (mainBuffer.pageInfo) {
306	+	free(mainBuffer.pageInfo);
307	+	mainBuffer.pageInfo = NULL;
308	+	}
309	+	if (mainBuffer.dirtyPages) {
310	+	free(mainBuffer.dirtyPages);
311	+	mainBuffer.dirtyPages = NULL;
312	+	}
313	+	}
314	+
315	+
316	+	/*
317		* Screen fault handler
318		*/
319
320	<	static bool screen_fault_handler(sigsegv_address_t fault_address, sigsegv_address_t fault_instruction)
320	>	bool Screen_fault_handler(sigsegv_address_t fault_address, sigsegv_address_t fault_instruction)
321		{
240	–	D(bug("screen_fault_handler: ADDR=0x%08X from IP=0x%08X\n", fault_address, fault_instruction));
322		const uintptr addr = (uintptr)fault_address;
323
324		/* Someone attempted to write to the frame buffer. Make it writeable
325		* now so that the data could actually be written to. It will be made
326		* read-only back in one of the screen update_*() functions.
327		*/
328	<	if ((addr >= mainBuffer.memStart) && (addr < mainBuffer.memEnd)) {
329	<	const int page  = (addr - mainBuffer.memStart) >> mainBuffer.pageBits;
249	<	caddr_t page_ad = (caddr_t)(addr & -mainBuffer.pageSize);
328	>	if (((uintptr)addr - mainBuffer.memStart) < mainBuffer.memLength) {
329	>	const int page  = ((uintptr)addr - mainBuffer.memStart) >> mainBuffer.pageBits;
330		LOCK_VOSF;
331		PFLAG_SET(page);
332	<	vm_protect((char *)page_ad, mainBuffer.pageSize, VM_PAGE_READ | VM_PAGE_WRITE);
332	>	vm_protect((char *)(addr & -mainBuffer.pageSize), mainBuffer.pageSize, VM_PAGE_READ | VM_PAGE_WRITE);
333		mainBuffer.dirty = true;
334		UNLOCK_VOSF;
335		return true;
336		}
337
338		/* Otherwise, we don't know how to handle the fault, let it crash */
259	–	fprintf(stderr, "do_handle_screen_fault: unhandled address 0x%08X", addr);
260	–	if (fault_instruction != SIGSEGV_INVALID_PC)
261	–	fprintf(stderr, " [IP=0x%08X]", fault_instruction);
262	–	fprintf(stderr, "\n");
263	–	#if EMULATED_68K
264	–	uaecptr nextpc;
265	–	extern void m68k_dumpstate(uaecptr *nextpc);
266	–	m68k_dumpstate(&nextpc);
267	–	#endif
268	–	VideoQuitFullScreen();
269	–	#ifdef ENABLE_MON
270	–	char *arg[4] = {"mon", "-m", "-r", NULL};
271	–	mon(3, arg);
272	–	QuitEmulator();
273	–	#endif
339		return false;
340		}
341
#	Line 279 | Line 344 | static bool screen_fault_handler(sigsegv
344		*      Update display for Windowed mode and VOSF
345		*/
346
282	–	// From video_blit.cpp
283	–	extern void (*Screen_blit)(uint8 * dest, const uint8 * source, uint32 length);
284	–	extern bool Screen_blitter_init(XVisualInfo * visual_info, bool native_byte_order, video_depth mac_depth);
285	–	extern uint32 ExpandMap[256];
286	–
347		/*      How can we deal with array overrun conditions ?
348
349		The state of the framebuffer pages that have been touched are maintained
#	Line 317 | Line 377 | There are two cases to check:
377		than pageCount.
378		*/
379
380	<	static inline void update_display_window_vosf(driver_window *drv)
380	>	static inline void update_display_window_vosf(VIDEO_DRV_INIT)
381		{
382	+	VIDEO_MODE_INIT;
383	+
384		int page = 0;
385		for (;;) {
386	<	const int first_page = find_next_page_set(page);
386	>	const unsigned first_page = find_next_page_set(page);
387		if (first_page >= mainBuffer.pageCount)
388		break;
389
#	Line 337 | Line 399 | static inline void update_display_window
399		const int y1 = mainBuffer.pageInfo[first_page].top;
400		const int y2 = mainBuffer.pageInfo[page - 1].bottom;
401		const int height = y2 - y1 + 1;
340	–
341	–	if (VideoMonitor.mode.depth < VDEPTH_8BIT) {
402
403	<	// Update the_host_buffer and copy of the_buffer
404	<	const int src_bytes_per_row = VideoMonitor.mode.bytes_per_row;
405	<	const int dst_bytes_per_row = drv->img->bytes_per_line;
406	<	const int pixels_per_byte = VideoMonitor.mode.x / src_bytes_per_row;
407	<	int i1 = y1 * src_bytes_per_row, i2 = y1 * dst_bytes_per_row, j;
408	<	for (j = y1; j <= y2; j++) {
409	<	Screen_blit(the_host_buffer + i2, the_buffer + i1, VideoMonitor.mode.x / pixels_per_byte);
410	<	i1 += src_bytes_per_row;
411	<	i2 += dst_bytes_per_row;
352	<	}
353	<
354	<	} else {
355	<
356	<	// Update the_host_buffer and copy of the_buffer
357	<	const int src_bytes_per_row = VideoMonitor.mode.bytes_per_row;
358	<	const int dst_bytes_per_row = drv->img->bytes_per_line;
359	<	const int bytes_per_pixel = src_bytes_per_row / VideoMonitor.mode.x;
360	<	int i1 = y1 * src_bytes_per_row, i2 = y1 * dst_bytes_per_row, j;
361	<	for (j = y1; j <= y2; j++) {
362	<	Screen_blit(the_host_buffer + i2, the_buffer + i1, bytes_per_pixel * VideoMonitor.mode.x);
363	<	i1 += src_bytes_per_row;
364	<	i2 += dst_bytes_per_row;
365	<	}
403	>	// Update the_host_buffer
404	>	VIDEO_DRV_LOCK_PIXELS;
405	>	const int src_bytes_per_row = VIDEO_MODE_ROW_BYTES;
406	>	const int dst_bytes_per_row = VIDEO_DRV_ROW_BYTES;
407	>	int i1 = y1 * src_bytes_per_row, i2 = y1 * dst_bytes_per_row, j;
408	>	for (j = y1; j <= y2; j++) {
409	>	Screen_blit(the_host_buffer + i2, the_buffer + i1, src_bytes_per_row);
410	>	i1 += src_bytes_per_row;
411	>	i2 += dst_bytes_per_row;
412		}
413	+	VIDEO_DRV_UNLOCK_PIXELS;
414
415	<	if (drv->have_shm)
416	<	XShmPutImage(x_display, drv->w, drv->gc, drv->img, 0, y1, 0, y1, VideoMonitor.mode.x, height, 0);
415	>	#ifdef USE_SDL_VIDEO
416	>	SDL_UpdateRect(drv->s, 0, y1, VIDEO_MODE_X, height);
417	>	#else
418	>	if (VIDEO_DRV_HAVE_SHM)
419	>	XShmPutImage(x_display, VIDEO_DRV_WINDOW, VIDEO_DRV_GC, VIDEO_DRV_IMAGE, 0, y1, 0, y1, VIDEO_MODE_X, height, 0);
420		else
421	<	XPutImage(x_display, drv->w, drv->gc, drv->img, 0, y1, 0, y1, VideoMonitor.mode.x, height);
421	>	XPutImage(x_display, VIDEO_DRV_WINDOW, VIDEO_DRV_GC, VIDEO_DRV_IMAGE, 0, y1, 0, y1, VIDEO_MODE_X, height);
422	>	#endif
423		}
424		mainBuffer.dirty = false;
425		}
#	Line 382 | Line 433 | static inline void update_display_window
433		#if REAL_ADDRESSING || DIRECT_ADDRESSING
434		static inline void update_display_dga_vosf(void)
435		{
436	+	VIDEO_MODE_INIT;
437	+
438	+	if (mainBuffer.very_dirty) {
439	+	PFLAG_CLEAR_ALL;
440	+	vm_protect((char *)mainBuffer.memStart, mainBuffer.memLength, VM_PAGE_READ);
441	+	VIDEO_DRV_LOCK_PIXELS;
442	+	memcpy(the_buffer_copy, the_buffer, VIDEO_MODE_ROW_BYTES * VIDEO_MODE_Y);
443	+	Screen_blit(the_host_buffer, the_buffer, VIDEO_MODE_ROW_BYTES * VIDEO_MODE_Y);
444	+	VIDEO_DRV_UNLOCK_PIXELS;
445	+	return;
446	+	}
447	+
448		int page = 0;
449		for (;;) {
450	<	const int first_page = find_next_page_set(page);
450	>	const unsigned first_page = find_next_page_set(page);
451		if (first_page >= mainBuffer.pageCount)
452		break;
453
#	Line 396 | Line 459 | static inline void update_display_dga_vo
459		const uint32 length = (page - first_page) << mainBuffer.pageBits;
460		vm_protect((char *)mainBuffer.memStart + offset, length, VM_PAGE_READ);
461
462	<	// I am sure that y2 >= y1 and depth != 1
462	>	// There is at least one line to update
463		const int y1 = mainBuffer.pageInfo[first_page].top;
464		const int y2 = mainBuffer.pageInfo[page - 1].bottom;
465	<
466	<	const int bytes_per_row = VideoMonitor.mode.bytes_per_row;
467	<	const int bytes_per_pixel = VideoMonitor.mode.bytes_per_row / VideoMonitor.mode.x;
465	>
466	>	#ifndef USE_SDL_VIDEO
467	>	// Update the_host_buffer and copy of the_buffer (use 64 bytes chunks)
468	>	const int src_bytes_per_row = VIDEO_MODE_ROW_BYTES;
469	>	const int dst_bytes_per_row = the_host_buffer_row_bytes;
470	>	const int n_pixels = 64;
471	>	const int n_chunks = VIDEO_MODE_X / n_pixels;
472	>	const int src_chunk_size = src_bytes_per_row / n_chunks;
473	>	const int dst_chunk_size = dst_bytes_per_row / n_chunks;
474	>	const int src_chunk_size_left = src_bytes_per_row - (n_chunks * src_chunk_size);
475	>	const int dst_chunk_size_left = dst_bytes_per_row - (n_chunks * dst_chunk_size);
476	>	int i1 = y1 * src_bytes_per_row;
477	>	int i2 = y1 * dst_bytes_per_row;
478	>	VIDEO_DRV_LOCK_PIXELS;
479	>	for (int j = y1; j <= y2; j++) {
480	>	for (int i = 0; i < n_chunks; i++) {
481	>	if (memcmp(the_buffer_copy + i1, the_buffer + i1, src_chunk_size) != 0) {
482	>	memcpy(the_buffer_copy + i1, the_buffer + i1, src_chunk_size);
483	>	Screen_blit(the_host_buffer + i2, the_buffer + i1, src_chunk_size);
484	>	}
485	>	i1 += src_chunk_size;
486	>	i2 += dst_chunk_size;
487	>	}
488	>	if (src_chunk_size_left && dst_chunk_size_left) {
489	>	if (memcmp(the_buffer_copy + i1, the_buffer + i1, src_chunk_size_left) != 0) {
490	>	memcpy(the_buffer_copy + i1, the_buffer + i1, src_chunk_size_left);
491	>	Screen_blit(the_host_buffer + i2, the_buffer + i1, src_chunk_size_left);
492	>	}
493	>	i1 += src_chunk_size_left;
494	>	i2 += dst_chunk_size_left;
495	>	}
496	>	}
497	>	VIDEO_DRV_UNLOCK_PIXELS;
498	>	#else
499	>	// Check for first chunk from left and first chunk from right that have changed
500	>	typedef uint64 chunk_t;
501	>	const int chunk_size = sizeof(chunk_t);
502	>	const int bytes_per_row = VIDEO_MODE_ROW_BYTES;
503	>
504		int i, j;
505	<
506	<	// Check for first column from left and first column
408	<	// from right that have changed
409	<	int x1 = VideoMonitor.mode.x * bytes_per_pixel - 1;
505	>	int b1 = bytes_per_row / chunk_size;
506	>	int b2 = 0;
507		for (j = y1; j <= y2; j++) {
508	<	uint8 * const p1 = &the_buffer[j * bytes_per_row];
509	<	uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
510	<	for (i = 0; i < x1; i++) {
508	>	chunk_t * const p1 = (chunk_t *)(the_buffer + (j * bytes_per_row));
509	>	chunk_t * const p2 = (chunk_t *)(the_buffer_copy + (j * bytes_per_row));
510	>	for (i = 0; i < b1; i++) {
511		if (p1[i] != p2[i]) {
512	<	x1 = i;
512	>	b1 = i;
513		break;
514		}
515		}
516	<	}
517	<	x1 /= bytes_per_pixel;
518	<
422	<	int x2 = x1 * bytes_per_pixel;
423	<	for (j = y2; j >= y1; j--) {
424	<	uint8 * const p1 = &the_buffer[j * bytes_per_row];
425	<	uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
426	<	for (i = VideoMonitor.mode.x * bytes_per_pixel - 1; i > x2; i--) {
516	>	if (b1 > b2)
517	>	b2 = b1;
518	>	for (i = (bytes_per_row / chunk_size) - 1; i > b2; i--) {
519		if (p1[i] != p2[i]) {
520	<	x2 = i;
520	>	b2 = i;
521		break;
522		}
523		}
524		}
525	<	x2 /= bytes_per_pixel;
526	<
525	>	b2++;
526	>
527	>	// Convert to pixel information
528	>	int x1, x2;
529	>	switch (VIDEO_MODE_DEPTH) {
530	>	case VIDEO_DEPTH_1BIT:  x1 = (b1 * chunk_size) << 3; x2 = (b2 * chunk_size) << 3;       break;
531	>	case VIDEO_DEPTH_2BIT:  x1 = (b1 * chunk_size) << 2; x2 = (b2 * chunk_size) << 2;       break;
532	>	case VIDEO_DEPTH_4BIT:  x1 = (b1 * chunk_size) << 1; x2 = (b2 * chunk_size) << 1;       break;
533	>	case VIDEO_DEPTH_8BIT:  x1 = b1 * chunk_size; x2 = b2 * chunk_size;                                     break;
534	>	case VIDEO_DEPTH_16BIT: x1 = (b1 * chunk_size) >> 1; x2 = (b2 * chunk_size) >> 1;       break;
535	>	case VIDEO_DEPTH_32BIT: x1 = (b1 * chunk_size) >> 2; x2 = (b2 * chunk_size) >> 2;       break;
536	>	}
537	>	const int width = x2 - x1;
538	>
539	>	// Normalize bounds for for the next blit
540	>	const int src_bytes_per_row = VIDEO_MODE_ROW_BYTES;
541	>	const int dst_bytes_per_row = the_host_buffer_row_bytes;
542	>	const int dst_bytes_per_pixel = dst_bytes_per_row / VIDEO_MODE_X;
543	>	int i2 = y1 * dst_bytes_per_row + x1 * dst_bytes_per_pixel;
544	>	int i1, n_bytes;
545	>	if ((int)VIDEO_MODE_DEPTH < VIDEO_DEPTH_8BIT) {
546	>	const int src_pixels_per_byte = VIDEO_MODE_X / src_bytes_per_row;
547	>	i1 = y1 * src_bytes_per_row + x1 / src_pixels_per_byte;
548	>	n_bytes = width / src_pixels_per_byte;
549	>	} else {
550	>	const int src_bytes_per_pixel = src_bytes_per_row / VIDEO_MODE_X;
551	>	i1 = y1 * src_bytes_per_row + x1 * src_bytes_per_pixel;
552	>	n_bytes = width * src_bytes_per_pixel;
553	>	}
554	>
555		// Update the_host_buffer and copy of the_buffer
556	<	// There should be at least one pixel to copy
437	<	const int width = x2 - x1 + 1;
438	<	i = y1 * bytes_per_row + x1 * bytes_per_pixel;
556	>	VIDEO_DRV_LOCK_PIXELS;
557		for (j = y1; j <= y2; j++) {
558	<	Screen_blit(the_host_buffer + i, the_buffer + i, bytes_per_pixel * width);
559	<	memcpy(the_buffer_copy + i, the_buffer + i, bytes_per_pixel * width);
560	<	i += bytes_per_row;
558	>	Screen_blit(the_host_buffer + i2, the_buffer + i1, n_bytes);
559	>	memcpy(the_buffer_copy + i1, the_buffer + i1, n_bytes);
560	>	i1 += src_bytes_per_row;
561	>	i2 += dst_bytes_per_row;
562		}
563	+	VIDEO_DRV_UNLOCK_PIXELS;
564	+	#endif
565		}
566		mainBuffer.dirty = false;
567		}

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